/* ===================== index.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --secondary: #ff8c42;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
        }
        
        
/* ===================== COURSE THEME OVERRIDES ===================== */

body[data-course="1020"] {
    /* Subtle ENG 1020 palette shift (shares same layout + components) */
    /* Seagreen theme requested */
    --primary: #2E8B57;
    --primary-dark: #1F6F46;
    --secondary: #d99a2b;
    --accent: #7aa8ff;
    --orange-glow: rgba(217, 154, 43, 0.14);
}

/* Optional: slightly different hero icon vibe in 1020 */
body[data-course="1020"] .compass-icon-large {
    color: rgba(255, 255, 255, 0.92);
}

/* ===================== END COURSE THEME OVERRIDES ===================== */
body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: #f5f7fa;
            color: #333;
            padding-top: 70px;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: background-color 0.3s, color 0.3s;
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

/* ===================== HERO HEADER FOR INDEX PAGE ===================== */

/* Hero Header for Index Page */
.hero-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 60px 0 40px;
    margin-bottom: 30px;
    border-radius: 0 0 20px 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
}

body.dark-mode .hero-header {
    background: linear-gradient(135deg, var(--dark-secondary) 0%, var(--dark) 100%);
}

/* Ensure text in hero header is visible */
.hero-header h1 {
    color: #ffffff !important;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-header p {
    color: #ffffff !important;
}

.hero-header .main-title-container {
    color: #ffffff;
}

.hero-header .compass-icon-large {
    color: #ffffff;
}

/* ===================== END HERO HEADER ===================== */



        /* Progress Bar at very top */
        .progress-container-top {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar-top {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }
        
        .header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            padding: 60px 0 40px;
            margin-bottom: 30px;
            border-radius: 0 0 20px 20px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: relative;
            overflow: hidden;
        }

        body.dark-mode .header {
            background: linear-gradient(135deg, var(--dark-secondary) 0%, var(--dark) 100%);
        }

        .main-title-container {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            margin-bottom: 20px;
        }

        .compass-icon-large {
            font-size: 4em;
            animation: spin 20s linear infinite;
            color: rgba(255, 255, 255, 0.9);
        }

        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }
        
        .btn-light {
            border: 2px solid transparent;
            transition: all 0.3s;
        }
        
        .btn-light:hover {
            border-color: var(--secondary);
            transform: translateY(-2px);
            background-color: var(--secondary);
            color: white;
        }
        
        .btn-outline-light:hover {
            background-color: var(--secondary);
            border-color: var(--secondary);
            color: white;
            transform: translateY(-2px);
        }
        
        .guide-card {
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            background: white;
            border-top: 4px solid transparent;
        }
        
        .guide-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 20px rgba(0,0,0,0.15);
            border-top-color: var(--secondary);
        }

        body.dark-mode .guide-card {
            background: var(--dark-secondary);
            color: var(--dark-text);
        }
        
        .card-number {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--primary);
            color: white;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2em;
            transition: all 0.3s;
        }

        .guide-card:hover .card-number {
            background: var(--secondary);
            transform: scale(1.1);
        }
        
        .chapter-title {
            color: var(--primary);
            font-weight: 600;
            min-height: 60px;
            font-size: 1.25rem;
            transition: color 0.3s;
        }

        body.dark-mode .chapter-title {
            color: #6a8ec7;
        }

        .guide-card:hover .chapter-title {
            color: var(--secondary);
        }
        
        .card-icon {
            font-size: 2.5em;
            color: var(--primary);
            margin-bottom: 15px;
            transition: color 0.3s, transform 0.3s;
        }

        body.dark-mode .card-icon {
            color: #6a8ec7;
        }
        
        .guide-card:hover .card-icon {
            color: var(--secondary);
            transform: scale(1.1);
        }
        
        .status-badge {
            position: absolute;
            top: 15px;
            left: 15px;
        }
        
        .progress-badge {
            background-color: var(--secondary);
            color: white;
        }
        
        .features-section {
            background-color: white;
            padding: 40px 0;
            border-radius: 20px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            margin: 40px 0;
            border-top: 4px solid var(--secondary);
            transition: box-shadow 0.3s;
        }

        .features-section:hover {
            box-shadow: 0 8px 25px rgba(0,0,0,0.12);
        }

        body.dark-mode .features-section {
            background-color: var(--dark-secondary);
            color: var(--dark-text);
        }
        
        .feature-icon {
            font-size: 2.5em;
            color: var(--primary);
            margin-bottom: 15px;
            transition: color 0.3s, transform 0.3s;
        }

        body.dark-mode .feature-icon {
            color: #6a8ec7;
        }
        
        .feature-item:hover .feature-icon {
            color: var(--secondary);
            transform: scale(1.1);
        }

        .feature-item {
            transition: transform 0.3s;
            padding: 20px;
            border-radius: 8px;
        }

        .feature-item:hover {
            transform: translateY(-3px);
            background-color: var(--orange-glow);
        }

        body.dark-mode .feature-item:hover {
            background-color: rgba(255, 140, 66, 0.1);
        }
        
        .footer {
            background: var(--dark);
            color: white;
            padding: 40px 0;
            margin-top: 50px;
            border-top: 4px solid var(--secondary);
        }
        
        .navbar {
            background: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 15px 0;
            position: fixed;
            top: 5px;
            left: 0;
            right: 0;
            z-index: 1000;
            transition: background-color 0.3s;
        }

        body.dark-mode .navbar {
            background: var(--dark-secondary);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        /* Hamburger Menu */
        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: #444;
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: #6a8ec7;
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid #e9ecef;
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: #444;
            color: #ffab70;
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }
        
        .dropdown-menu {
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            border-radius: 12px;
            padding: 10px;
            min-width: 300px;
        }
        
        .dropdown-item {
            border-radius: 8px;
            padding: 10px 15px;
            margin: 5px 0;
            transition: background 0.3s;
            white-space: normal;
        }
        
        .dropdown-item:hover {
            background: #f8f9fa;
            color: var(--secondary);
        }
        
        .chapter-link {
            text-decoration: none;
            color: inherit;
        }
        
        .chapter-link:hover {
            text-decoration: none;
            color: inherit;
        }
        .progress-card {
            background: white;
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            margin: 30px 0;
            border-left: 4px solid var(--secondary);
            transition: box-shadow 0.3s, transform 0.3s;
        }
        .progress-card:hover {
            box-shadow: 0 8px 25px rgba(0,0,0,0.12);
            transform: translateY(-2px);
        }

        body.dark-mode .progress-card {
            background: var(--dark-secondary);
            color: var(--dark-text);
        }
        
        .progress {
            height: 12px;
            border-radius: 6px;
            margin: 15px 0;
            background-color: #e9ecef;
        }

        body.dark-mode .progress {
            background-color: #444;
        }
        
        .progress-bar {
            background-color: var(--secondary);
            transition: width 0.5s ease;
        }
        
        .reset-progress {
            color: var(--secondary);
            cursor: pointer;
            font-size: 0.9rem;
            text-decoration: underline;
            transition: color 0.3s, transform 0.3s;
        }
        
        .reset-progress:hover {
            color: var(--primary-dark);
            transform: scale(1.05);
        }
        
        .completed-check {
            color: var(--success);
            margin-left: 5px;
        }

        /* Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Mobile Responsive */
        @media (max-width: 768px) {
            body {
                padding-top: 65px;
            }

            .navbar {
                padding: 8px 0;
                top: 5px;
            }

            .sidebar {
                width: 280px;
                left: -280px;
            }

            .main-title-container {
                flex-direction: column;
                gap: 10px;
            }

            .compass-icon-large {
                font-size: 3em;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .sidebar-link, .btn, .guide-card, .hamburger-menu {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-1.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px; /* Just navbar height */
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* FIXED: Progress Bar at very top like Chapter 6 */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px; /* Account for progress bar */
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .navbar-content .hamburger-menu {
            position: absolute;
            left: 20px;
            top: 50%;
            transform: translateY(-50%);
        }

        /* Reserve space so the centered brand can’t collide with the hamburger */
        .navbar-content {
            padding-left: 70px;
            padding-right: 20px;
        }

        .navbar-brand {
            max-width: calc(100% - 90px);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            text-align: center;
        }

        @media (max-width: 520px) {
            .navbar-content { padding-left: 60px; padding-right: 16px; }
            .navbar-brand { max-width: calc(100% - 80px); }
        }


        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        /* Reading time estimates */
        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 900px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-label {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-label {
            color: var(--primary-light);
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Research Insight";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* FIXED: Enhanced Tables with Mobile Scrolling */
        .table-container {
            overflow-x: auto;
            margin: 20px 0;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .table-container:hover {
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .table-container {
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        .strategies-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 1em;
            min-width: 600px; /* Ensures table doesn't get too cramped */
            transition: var(--transition-smooth);
        }

        .strategies-table th {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 15px 10px;
            font-weight: bold;
            text-align: left;
            position: relative;
            white-space: nowrap;
        }

        .strategies-table td {
            padding: 12px 10px;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
            transition: var(--transition-quick);
            vertical-align: top;
        }
        
        .strategies-table tr:nth-child(even) td {
            background-color: #ffffff;
        }

        body.dark-mode .strategies-table td {
            background-color: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        body.dark-mode .strategies-table tr:nth-child(even) td {
            background-color: #3a3a3a;
        }

        .strategies-table td:hover {
            background-color: var(--orange-glow);
            cursor: default;
            transform: scale(1.02);
        }

        body.dark-mode .strategies-table td:hover {
            background-color: #2a4365;
        }

        /* Enhanced Annotation Elements */
        .annotation-example {
            background-color: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 20px 0;
            font-family: 'Georgia', serif;
            line-height: 1.8;
            position: relative;
            transition: var(--transition-smooth);
        }

        .annotation-example:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .annotation-example {
            background-color: #2d3748;
            border-color: #4a5568;
            color: #e2e8f0;
        }

        .annotation-example .text {
            position: relative;
            padding-right: 40%;
        }

        .annotation-example .margin-notes {
            position: absolute;
            right: 20px;
            top: 20px;
            width: 35%;
            background: #e9ecef;
            padding: 15px;
            border-radius: 6px;
            font-size: 0.9em;
            border-left: 3px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .annotation-example:hover .margin-notes {
            border-left-color: var(--secondary);
            box-shadow: var(--shadow-soft);
        }

        body.dark-mode .annotation-example .margin-notes {
            background: #4a5568;
            border-left-color: var(--primary-light);
        }

        .annotation-example .highlight {
            background-color: rgba(255, 230, 0, 0.3);
            padding: 0 2px;
            transition: var(--transition-quick);
        }

        .annotation-example .highlight:hover {
            background-color: rgba(255, 140, 66, 0.4);
        }

        body.dark-mode .annotation-example .highlight {
            background-color: rgba(255, 230, 0, 0.5);
            color: #000;
        }

        .annotation-system {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
            margin: 20px 0;
        }

        .annotation-item {
            padding: 12px;
            border-radius: 6px;
            background: #f8f9fa;
            transition: var(--transition-smooth);
            cursor: pointer;
            border: 2px solid transparent;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .annotation-item {
            background: #2d3748;
        }

        .annotation-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
            background-color: var(--orange-glow);
        }

        .annotation-item.selected {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .annotation-color {
            width: 20px;
            height: 20px;
            display: inline-block;
            border-radius: 50%;
            margin-right: 8px;
            border: 2px solid rgba(0,0,0,0.1);
        }

        /* Enhanced Social Exercise Styles */
        .social-exercise {
            background: #f0f8ff;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 20px 0;
            border-left: 4px solid #6a7fdb;
            transition: var(--transition-smooth);
        }

        .social-exercise:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
            border-left-color: var(--secondary);
        }

        body.dark-mode .social-exercise {
            background: #2a3d66;
        }

        .social-exercise h4 {
            display: flex;
            align-items: center;
            color: #6a7fdb;
            margin-bottom: 15px;
            transition: var(--transition-smooth);
        }

        .social-exercise:hover h4 {
            color: var(--secondary);
        }

        .social-exercise h4 i {
            margin-right: 10px;
        }

        /* Enhanced Difficulty Labels */
        .difficulty-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .difficulty-easy {
            background-color: #d4edda;
            color: #155724;
        }

        .difficulty-easy:hover {
            background-color: var(--success);
            color: white;
            transform: scale(1.05);
        }

        .difficulty-medium {
            background-color: #fff3cd;
            color: #856404;
        }

        .difficulty-medium:hover {
            background-color: var(--warning);
            color: #333;
            transform: scale(1.05);
        }

        .difficulty-hard {
            background-color: #f8d7da;
            color: #721c24;
        }

        .difficulty-hard:hover {
            background-color: var(--danger);
            color: white;
            transform: scale(1.05);
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px; /* Adjusted for mobile navbar + progress */
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px; /* Still account for progress bar */
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }
            
            .annotation-example .text {
                padding-right: 0;
            }
            
            .annotation-example .margin-notes {
                position: relative;
                width: 100%;
                margin-top: 20px;
                right: 0;
            }
            
            .annotation-system {
                grid-template-columns: 1fr;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            /* Mobile table fix */
            .table-container {
                margin: 15px -15px; /* Extend to edges on mobile */
                border-radius: 0;
            }

            .strategies-table {
                font-size: 0.9em;
            }

            .strategies-table th,
            .strategies-table td {
                padding: 8px 6px;
            }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }

            .annotation-example .text {
                padding-right: 0;
            }
            
            .annotation-example .margin-notes {
                position: relative;
                width: 100%;
                margin-top: 20px;
                right: 0;
            }

            /* Tablet table adjustments */
            .strategies-table {
                font-size: 0.95em;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .annotation-item, .sidebar-link {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .table-container {
                overflow: visible !important;
            }

            .strategies-table {
                min-width: auto !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-2.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px;
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* Progress Bar at very top */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-number {
            font-size: 2em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-number {
            color: var(--primary-light);
        }

        .stat-label {
            font-size: 0.9em;
            color: var(--gray);
        }

        body.dark-mode .stat-label {
            color: #aaa;
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        .section-content h3 {
            color: var(--primary);
            margin: 25px 0 15px 0;
            font-size: 1.3em;
        }

        body.dark-mode .section-content h3 {
            color: var(--primary-light);
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .example-box strong {
            color: #1565c0;
            font-style: normal;
        }

        body.dark-mode .example-box strong {
            color: #90cdf4;
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Research Insight";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .practice-item strong {
            color: #856404;
            display: block;
            margin-bottom: 8px;
            font-size: 1.1em;
        }

        body.dark-mode .practice-item strong {
            color: #f9c74f;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Social media exercises */
        .social-exercise {
            background: #f0f8ff;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 20px 0;
            border-left: 4px solid #6a7fdb;
            transition: var(--transition-smooth);
        }

        body.dark-mode .social-exercise {
            background: #2a3d66;
            color: #f0f8ff;
        }

        .social-exercise:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .social-exercise h4 {
            display: flex;
            align-items: center;
            color: #6a7fdb;
            margin-bottom: 15px;
        }

        .social-exercise h4 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Enhanced Tables with Mobile Scrolling */
        .table-container {
            overflow-x: auto;
            margin: 20px 0;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .table-container:hover {
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .table-container {
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        .strategies-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 1em;
            min-width: 600px;
            transition: var(--transition-smooth);
        }

        .strategies-table th {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 15px 10px;
            font-weight: bold;
            text-align: left;
            white-space: nowrap;
        }

        .strategies-table td {
            padding: 12px 10px;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
            transition: var(--transition-quick);
            vertical-align: top;
        }

        .strategies-table tr:nth-child(even) td {
            background-color: #ffffff;
        }

        body.dark-mode .strategies-table td {
            background-color: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        body.dark-mode .strategies-table tr:nth-child(even) td {
            background-color: #3a3a3a;
        }

        .strategies-table td:hover {
            background-color: var(--orange-glow);
            cursor: default;
            transform: scale(1.02);
        }

        body.dark-mode .strategies-table td:hover {
            background-color: #2a4365;
        }

        /* Enhanced Difficulty Labels */
        .difficulty-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .difficulty-easy {
            background-color: #d4edda;
            color: #155724;
        }

        .difficulty-easy:hover {
            background-color: var(--success);
            color: white;
            transform: scale(1.05);
        }

        .difficulty-medium {
            background-color: #fff3cd;
            color: #856404;
        }

        .difficulty-medium:hover {
            background-color: var(--warning);
            color: #333;
            transform: scale(1.05);
        }

        .difficulty-hard {
            background-color: #f8d7da;
            color: #721c24;
        }

        .difficulty-hard:hover {
            background-color: var(--danger);
            color: white;
            transform: scale(1.05);
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px;
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px;
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            .table-container {
                margin: 15px -15px;
                border-radius: 0;
            }

            .strategies-table {
                font-size: 0.9em;
            }

            .strategies-table th,
            .strategies-table td {
                padding: 8px 6px;
            }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }

            .strategies-table {
                font-size: 0.95em;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .sidebar-link {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .table-container {
                overflow: visible !important;
            }

            .strategies-table {
                min-width: auto !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-3.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px; /* Just navbar height */
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* Progress Bar at very top */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px; /* Account for progress bar */
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        /* Reading time estimates */
        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-label {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-label {
            color: var(--primary-light);
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .example-box strong {
            color: #1565c0;
            font-style: normal;
        }

        body.dark-mode .example-box strong {
            color: #90cdf4;
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Research Insight";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .practice-item strong {
            color: #856404;
            display: block;
            margin-bottom: 8px;
            font-size: 1.1em;
        }

        body.dark-mode .practice-item strong {
            color: #f9c74f;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Enhanced Tables with Mobile Scrolling */
        .table-container {
            overflow-x: auto;
            margin: 20px 0;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .table-container:hover {
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .table-container {
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 1em;
            min-width: 600px;
            transition: var(--transition-smooth);
        }

        .comparison-table th {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 15px 10px;
            font-weight: bold;
            text-align: left;
            white-space: nowrap;
        }

        .comparison-table td {
            padding: 12px 10px;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
            transition: var(--transition-quick);
            vertical-align: top;
        }

        .comparison-table tr:nth-child(even) td {
            background-color: #ffffff;
        }

        body.dark-mode .comparison-table td {
            background-color: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        body.dark-mode .comparison-table tr:nth-child(even) td {
            background-color: #3a3a3a;
        }

        .comparison-table td:hover {
            background-color: var(--orange-glow);
            cursor: default;
            transform: scale(1.02);
        }

        body.dark-mode .comparison-table td:hover {
            background-color: #2a4365;
        }

        /* Enhanced Difficulty Labels */
        .difficulty-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .difficulty-easy {
            background-color: #d4edda;
            color: #155724;
        }

        .difficulty-easy:hover {
            background-color: var(--success);
            color: white;
            transform: scale(1.05);
        }

        .difficulty-medium {
            background-color: #fff3cd;
            color: #856404;
        }

        .difficulty-medium:hover {
            background-color: var(--warning);
            color: #333;
            transform: scale(1.05);
        }

        .difficulty-hard {
            background-color: #f8d7da;
            color: #721c24;
        }

        .difficulty-hard:hover {
            background-color: var(--danger);
            color: white;
            transform: scale(1.05);
        }

        /* Synthesis framework - Enhanced */
        .synthesis-framework {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 15px;
            margin: 25px 0;
            transition: var(--transition-smooth);
        }

        .synthesis-source {
            background: #e9ecef;
            padding: 20px;
            border-radius: var(--border-radius);
            text-align: center;
            transition: var(--transition-smooth);
            border: 2px solid transparent;
        }

        .synthesis-source:hover {
            background-color: var(--orange-glow);
            transform: translateY(-3px);
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .synthesis-source {
            background: #4a5568;
            color: var(--dark-text);
        }

        .synthesis-arrow {
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.8em;
            color: var(--primary);
            transition: var(--transition-smooth);
        }

        .synthesis-arrow:hover {
            color: var(--secondary);
            transform: scale(1.2);
        }

        .synthesis-result {
            grid-column: span 4;
            background: #d1ecf1;
            padding: 25px;
            border-radius: var(--border-radius);
            margin-top: 20px;
            border-left: 4px solid var(--accent);
            transition: var(--transition-smooth);
        }

        .synthesis-result:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .synthesis-result {
            background: #2a4365;
            color: var(--dark-text);
        }

        /* Enhanced Career Examples */
        .career-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 25px;
            margin: 30px 0;
        }

        .career-card {
            background: #f8f9fa;
            border-radius: var(--border-radius);
            padding: 25px;
            border-left: 4px solid var(--primary);
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .career-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, var(--orange-glow), transparent);
            transition: left 0.6s;
        }

        .career-card:hover::before {
            left: 100%;
        }

        .career-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-medium);
            border-left-color: var(--secondary);
        }

        body.dark-mode .career-card {
            background: #2d3748;
            border-left-color: var(--primary-light);
            color: var(--dark-text);
        }

        .career-card h4 {
            color: var(--primary);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .career-card:hover h4 {
            color: var(--secondary);
        }

        body.dark-mode .career-card h4 {
            color: var(--primary-light);
        }

        .career-card h4 i {
            margin-right: 12px;
            font-size: 1.2em;
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px;
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px;
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            .table-container {
                margin: 15px -15px;
                border-radius: 0;
            }

            .comparison-table {
                font-size: 0.9em;
            }

            .comparison-table th,
            .comparison-table td {
                padding: 8px 6px;
            }

            .synthesis-framework {
                grid-template-columns: 1fr;
                gap: 10px;
            }
            
            .synthesis-arrow {
                display: none;
            }
            
            .synthesis-result {
                grid-column: span 1;
                margin-top: 10px;
            }
            
            .career-grid {
                grid-template-columns: 1fr;
                gap: 15px;
            }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }

            .comparison-table {
                font-size: 0.95em;
            }

            .synthesis-framework {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .sidebar-link, .career-card {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .table-container {
                overflow: visible !important;
            }

            .comparison-table {
                min-width: auto !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-4.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
            --citation-color: #fff3cd;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px;
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* Progress Bar at very top */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-label {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-label {
            color: var(--primary-light);
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .example-box strong {
            color: #1565c0;
            font-style: normal;
        }

        body.dark-mode .example-box strong {
            color: #90cdf4;
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Insights and Action";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .practice-item strong {
            color: #856404;
            display: block;
            margin-bottom: 8px;
            font-size: 1.1em;
        }

        body.dark-mode .practice-item strong {
            color: #f9c74f;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Citation elements */
        .citation-adapted {
            background-color: var(--citation-color);
            padding: 12px;
            border-radius: 6px;
            margin: 20px 0 5px 0;
            border-left: 3px solid var(--warning);
            transition: var(--transition-smooth);
            font-size: 0.85em;
        }

        .citation-adapted:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .citation-adapted {
            background-color: #5a4a1f;
            border-left-color: #f9c74f;
        }

        .citation-adapted p {
            margin: 0 0 8px 0;
            line-height: 1.4;
        }

        .citation-adapted a {
            color: var(--primary);
            text-decoration: none;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .citation-adapted a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }

        body.dark-mode .citation-adapted a {
            color: var(--primary-light);
        }

        /* Enhanced Difficulty Labels */
        .difficulty-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .difficulty-easy {
            background-color: #d4edda;
            color: #155724;
        }

        .difficulty-easy:hover {
            background-color: var(--success);
            color: white;
            transform: scale(1.05);
        }

        .difficulty-medium {
            background-color: #fff3cd;
            color: #856404;
        }

        .difficulty-medium:hover {
            background-color: var(--warning);
            color: #333;
            transform: scale(1.05);
        }

        .difficulty-hard {
            background-color: #f8d7da;
            color: #721c24;
        }

        .difficulty-hard:hover {
            background-color: var(--danger);
            color: white;
            transform: scale(1.05);
        }

        /* Position selector */
        .position-selector {
            display: flex;
            justify-content: space-between;
            margin: 25px 0;
            gap: 15px;
        }

        .position-option {
            flex: 1;
            padding: 20px;
            border-radius: var(--border-radius);
            text-align: center;
            cursor: pointer;
            transition: var(--transition-smooth);
            border: 2px solid transparent;
        }

        .position-agree {
            background: #d4edda;
            color: #155724;
        }

        .position-disagree {
            background: #f8d7da;
            color: #721c24;
        }

        .position-complicate {
            background: #e3f2fd;
            color: #0c5460;
        }

        .position-option.selected {
            border: 2px solid var(--primary);
            transform: translateY(-5px);
            box-shadow: var(--shadow-medium);
        }

        .position-option:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-soft);
        }

        body.dark-mode .position-agree {
            background: #1d3a2d;
            color: #d4edda;
        }

        body.dark-mode .position-disagree {
            background: #4a2f32;
            color: #f8d7da;
        }

        body.dark-mode .position-complicate {
            background: #2a4365;
            color: #e3f2fd;
        }

        /* Conversation visualizer */
        .conversation-visualizer {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            min-height: 300px;
            position: relative;
            transition: var(--transition-smooth);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .conversation-visualizer:hover {
            box-shadow: var(--shadow-medium);
            border-color: var(--secondary);
        }

        body.dark-mode .conversation-visualizer {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .conversation-bubble {
            padding: 15px;
            border-radius: 20px;
            max-width: 250px;
            transition: var(--transition-smooth);
            margin: 15px 0;
            position: relative;
            text-align: center;
        }

        .conversation-bubble:hover {
            transform: scale(1.05);
            box-shadow: var(--shadow-soft);
        }

        .bubble-source {
            background: #e3f2fd;
            border: 2px solid var(--primary);
            align-self: flex-start;
        }

        body.dark-mode .bubble-source {
            background: #2a4365;
            border-color: var(--primary-light);
            color: #e3f2fd;
        }

        .bubble-response {
            background: #d4edda;
            border: 2px solid var(--success);
            align-self: flex-end;
        }

        body.dark-mode .bubble-response {
            background: #1d3a2d;
            border-color: #38a169;
            color: #d4edda;
        }

        .bubble-counter {
            background: #fff3cd;
            border: 2px solid var(--warning);
            align-self: center;
        }

        body.dark-mode .bubble-counter {
            background: #5a4a1f;
            border-color: #f9c74f;
            color: #fff3cd;
        }

        /* Counterargument builder */
        .counterargument-builder {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .counterargument-builder:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .counterargument-builder {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .builder-step {
            margin-bottom: 20px;
        }

        .builder-step label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition-smooth);
        }

        body.dark-mode .builder-step label {
            color: var(--primary-light);
        }

        .builder-step input, .builder-step textarea, .builder-step select {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1em;
            transition: var(--transition-smooth);
        }

        .builder-step input:focus, .builder-step textarea:focus, .builder-step select:focus {
            border-color: var(--secondary);
            outline: none;
            box-shadow: 0 0 0 3px var(--orange-glow);
        }

        body.dark-mode .builder-step input, 
        body.dark-mode .builder-step textarea,
        body.dark-mode .builder-step select {
            background: #3a4356;
            border-color: #555;
            color: #f0f0f0;
        }

        .argument-preview {
            background: white;
            border-left: 4px solid var(--accent);
            padding: 20px;
            border-radius: 5px;
            margin-top: 20px;
            min-height: 100px;
            transition: var(--transition-smooth);
        }

        body.dark-mode .argument-preview {
            background: #3a4356;
            border-left-color: #6a7fdb;
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px;
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px;
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            .position-selector {
                flex-direction: column;
            }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .sidebar-link, .position-option, .conversation-bubble {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .conversation-visualizer, .counterargument-builder {
                border: 1px solid #000 !important;
                background: white !important;
                color: black !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-5.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
            --citation-color: #fff3cd;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px;
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* Progress Bar at very top */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-label {
            font-size: 2em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-label {
            color: var(--primary-light);
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .example-box strong {
            color: #1565c0;
            font-style: normal;
        }

        body.dark-mode .example-box strong {
            color: #90cdf4;
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Pro Tip";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .practice-item strong {
            color: #856404;
            display: block;
            margin-bottom: 8px;
            font-size: 1.1em;
        }

        body.dark-mode .practice-item strong {
            color: #f9c74f;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
            margin: 5px;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Enhanced Tables */
        .verb-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 1em;
            box-shadow: var(--shadow-soft);
            border-radius: var(--border-radius);
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        .verb-table:hover {
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .verb-table {
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        .verb-table th {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 15px 10px;
            font-weight: bold;
            text-align: center;
        }

        .verb-table td {
            padding: 12px 10px;
            text-align: center;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
            transition: var(--transition-quick);
        }

        .verb-table tr:nth-child(even) td {
            background-color: #ffffff;
        }

        body.dark-mode .verb-table td {
            background-color: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        body.dark-mode .verb-table tr:nth-child(even) td {
            background-color: #3a3a3a;
        }

        .verb-table td:hover {
            background-color: var(--orange-glow);
            cursor: default;
            transform: scale(1.02);
        }

        body.dark-mode .verb-table td:hover {
            background-color: #2a4365;
        }

        /* Interactive Builders */
        .sandwich-builder, .paraphrase-checker {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 20px 0;
            border: 2px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .sandwich-builder:hover, .paraphrase-checker:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .sandwich-builder, body.dark-mode .paraphrase-checker {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .sandwich-part {
            margin-bottom: 15px;
        }

        .sandwich-part label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition-smooth);
        }

        body.dark-mode .sandwich-part label {
            color: var(--primary-light);
        }

        .sandwich-part textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: inherit;
            font-size: 0.95em;
            transition: var(--transition-smooth);
            min-height: 100px;
        }

        .sandwich-part textarea:focus {
            border-color: var(--secondary);
            outline: none;
            box-shadow: 0 0 0 3px var(--orange-glow);
        }

        body.dark-mode .sandwich-part textarea {
            background: #3a4356;
            border-color: #555;
            color: #f0f0f0;
        }

        .sandwich-output {
            background: #f8f9fa;
            padding: 20px;
            border-radius: var(--border-radius);
            margin-top: 20px;
            border-left: 4px solid var(--accent);
            transition: var(--transition-smooth);
        }

        body.dark-mode .sandwich-output {
            background: #3a4356;
            border-left-color: #6a7fdb;
        }

        .sandwich-output h4 {
            margin-bottom: 10px;
            color: var(--primary);
        }

        body.dark-mode .sandwich-output h4 {
            color: var(--primary-light);
        }

        .feedback {
            margin-top: 15px;
            padding: 15px;
            border-radius: 5px;
            display: none;
            transition: var(--transition-smooth);
        }

        .feedback.good {
            background: #d4edda;
            border-left: 4px solid var(--success);
        }

        .feedback.improve {
            background: #fff3cd;
            border-left: 4px solid var(--warning);
        }

        body.dark-mode .feedback.good {
            background: #1d3a2d;
            color: #d4edda;
        }

        body.dark-mode .feedback.improve {
            background: #5a4a1f;
            color: #fff3cd;
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px;
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px;
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            .verb-table {
                font-size: 0.9em;
            }

            .verb-table th,
            .verb-table td {
                padding: 8px 6px;
            }

            .stat-label {
                font-size: 1.5em;
            }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .sidebar-link, .btn {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .sandwich-builder, .paraphrase-checker {
                border: 1px solid #000 !important;
                background: white !important;
                color: black !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-6.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
            --citation-color: #fff3cd;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px; /* Just navbar height */
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* Progress Bar at very top */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px; /* Account for progress bar */
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        /* Reading time estimates */
        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-label {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-label {
            color: var(--primary-light);
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .example-box strong {
            color: #1565c0;
            font-style: normal;
        }

        body.dark-mode .example-box strong {
            color: #90cdf4;
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Insights and Action";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .practice-item strong {
            color: #856404;
            display: block;
            margin-bottom: 8px;
            font-size: 1.1em;
        }

        body.dark-mode .practice-item strong {
            color: #f9c74f;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Citation elements */
        .citation-adapted {
            background-color: var(--citation-color);
            padding: 12px;
            border-radius: 6px;
            margin: 20px 0 5px 0;
            border-left: 3px solid var(--warning);
            transition: var(--transition-smooth);
            font-size: 0.85em;
        }

        .citation-adapted:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .citation-adapted {
            background-color: #5a4a1f;
            border-left-color: #f9c74f;
        }

        .citation-adapted p {
            margin: 0 0 8px 0;
            line-height: 1.4;
        }

        .citation-adapted a {
            color: var(--primary);
            text-decoration: none;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .citation-adapted a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }

        body.dark-mode .citation-adapted a {
            color: var(--primary-light);
        }

        /* Enhanced Tables with Mobile Scrolling */
        .table-container {
            overflow-x: auto;
            margin: 20px 0;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .table-container:hover {
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .table-container {
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 1em;
            min-width: 600px;
            transition: var(--transition-smooth);
        }

        .comparison-table th {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 15px 10px;
            font-weight: bold;
            text-align: left;
            white-space: nowrap;
        }

        .comparison-table td {
            padding: 12px 10px;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
            transition: var(--transition-quick);
            vertical-align: top;
        }

        .comparison-table tr:nth-child(even) td {
            background-color: #ffffff;
        }

        body.dark-mode .comparison-table td {
            background-color: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        body.dark-mode .comparison-table tr:nth-child(even) td {
            background-color: #3a3a3a;
        }

        .comparison-table td:hover {
            background-color: var(--orange-glow);
            cursor: default;
            transform: scale(1.02);
        }

        body.dark-mode .comparison-table td:hover {
            background-color: #2a4365;
        }

        /* Enhanced Difficulty Labels */
        .difficulty-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .difficulty-easy {
            background-color: #d4edda;
            color: #155724;
        }

        .difficulty-easy:hover {
            background-color: var(--success);
            color: white;
            transform: scale(1.05);
        }

        .difficulty-medium {
            background-color: #fff3cd;
            color: #856404;
        }

        .difficulty-medium:hover {
            background-color: var(--warning);
            color: #333;
            transform: scale(1.05);
        }

        .difficulty-hard {
            background-color: #f8d7da;
            color: #721c24;
        }

        .difficulty-hard:hover {
            background-color: var(--danger);
            color: white;
            transform: scale(1.05);
        }

        /* Bloom's Taxonomy Visualization - Enhanced */
        .blooms-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            margin: 30px 0;
        }

        .blooms-pyramid {
            width: 300px;
            height: 300px;
            position: relative;
            margin-bottom: 20px;
        }

        .blooms-level {
            position: absolute;
            width: 100%;
            height: 50px;
            background: var(--primary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            transition: var(--transition-smooth);
            cursor: pointer;
            left: 0;
            border-radius: 4px;
        }

        .blooms-level:hover {
            transform: scale(1.05) translateY(-2px);
            z-index: 10;
            box-shadow: var(--shadow-medium);
        }

        .blooms-level-1 { bottom: 0; background: #4CAF50; }
        .blooms-level-2 { bottom: 50px; background: #2196F3; }
        .blooms-level-3 { bottom: 100px; background: #FFC107; color: #333; }
        .blooms-level-4 { bottom: 150px; background: #FF9800; }
        .blooms-level-5 { bottom: 200px; background: #F44336; }
        .blooms-level-6 { bottom: 250px; background: #9C27B0; }

        .blooms-details {
            width: 100%;
            padding: 20px;
            background: #f8f9fa;
            border-radius: var(--border-radius);
            margin-top: 20px;
            transition: var(--transition-smooth);
        }

        body.dark-mode .blooms-details {
            background: #2d3748;
        }

        /* Enhanced Interactive Tools */
        .thesis-builder, .quote-builder, .counterargument-builder {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .thesis-builder:hover, .quote-builder:hover, .counterargument-builder:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .thesis-builder, 
        body.dark-mode .quote-builder,
        body.dark-mode .counterargument-builder {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .thesis-input, .quote-input, .builder-step {
            margin-bottom: 15px;
        }

        .thesis-input label, .quote-input label, .builder-step label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition-smooth);
        }

        body.dark-mode .thesis-input label,
        body.dark-mode .quote-input label,
        body.dark-mode .builder-step label {
            color: var(--primary-light);
        }

        .thesis-input input, .thesis-input textarea,
        .quote-input textarea,
        .builder-step input, .builder-step textarea, .builder-step select {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1em;
            transition: var(--transition-smooth);
        }

        .thesis-input input:focus, .thesis-input textarea:focus,
        .quote-input textarea:focus,
        .builder-step input:focus, .builder-step textarea:focus, .builder-step select:focus {
            border-color: var(--secondary);
            outline: none;
            box-shadow: 0 0 0 3px var(--orange-glow);
        }

        body.dark-mode .thesis-input input, body.dark-mode .thesis-input textarea,
        body.dark-mode .quote-input textarea,
        body.dark-mode .builder-step input, 
        body.dark-mode .builder-step textarea,
        body.dark-mode .builder-step select {
            background: #3a4356;
            border-color: #555;
            color: #f0f0f0;
        }

        .thesis-preview, .quote-preview, .argument-preview {
            background: white;
            border-left: 4px solid var(--accent);
            padding: 20px;
            border-radius: 5px;
            margin-top: 20px;
            min-height: 100px;
            transition: var(--transition-smooth);
        }

        body.dark-mode .thesis-preview,
        body.dark-mode .quote-preview,
        body.dark-mode .argument-preview {
            background: #3a4356;
            border-left-color: #6a7fdb;
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px;
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px;
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            .table-container {
                margin: 15px -15px;
                border-radius: 0;
            }

            .comparison-table {
                font-size: 0.9em;
            }

            .comparison-table th,
            .comparison-table td {
                padding: 8px 6px;
            }

            .blooms-pyramid {
                width: 250px;
                height: 250px;
            }

            .blooms-level {
                height: 42px;
                font-size: 0.9em;
            }

            .blooms-level-1 { bottom: 0; }
            .blooms-level-2 { bottom: 42px; }
            .blooms-level-3 { bottom: 84px; }
            .blooms-level-4 { bottom: 126px; }
            .blooms-level-5 { bottom: 168px; }
            .blooms-level-6 { bottom: 210px; }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }

            .comparison-table {
                font-size: 0.95em;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .sidebar-link, .blooms-level {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .table-container {
                overflow: visible !important;
            }

            .comparison-table {
                min-width: auto !important;
            }

            .thesis-builder, .quote-builder, .counterargument-builder {
                border: 1px solid #000 !important;
                background: white !important;
                color: black !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-7.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
            --citation-color: #fff3cd;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px;
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* Progress Bar at very top */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-label {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-label {
            color: var(--primary-light);
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .example-box strong {
            color: #1565c0;
            font-style: normal;
        }

        body.dark-mode .example-box strong {
            color: #90cdf4;
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Research Insight";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .practice-item strong {
            color: #856404;
            display: block;
            margin-bottom: 8px;
            font-size: 1.1em;
        }

        body.dark-mode .practice-item strong {
            color: #f9c74f;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
            margin: 5px;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Enhanced Difficulty Labels */
        .difficulty-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .difficulty-easy {
            background-color: #d4edda;
            color: #155724;
        }

        .difficulty-easy:hover {
            background-color: var(--success);
            color: white;
            transform: scale(1.05);
        }

        .difficulty-medium {
            background-color: #fff3cd;
            color: #856404;
        }

        .difficulty-medium:hover {
            background-color: var(--warning);
            color: #333;
            transform: scale(1.05);
        }

        .difficulty-hard {
            background-color: #f8d7da;
            color: #721c24;
        }

        .difficulty-hard:hover {
            background-color: var(--danger);
            color: white;
            transform: scale(1.05);
        }

        /* Enhanced Tables */
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 1em;
            box-shadow: var(--shadow-soft);
            border-radius: var(--border-radius);
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        .comparison-table:hover {
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .comparison-table {
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        .comparison-table th {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 15px 10px;
            font-weight: bold;
            text-align: left;
        }

        .comparison-table td {
            padding: 12px 10px;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
            transition: var(--transition-quick);
        }

        body.dark-mode .comparison-table td {
            background-color: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        .comparison-table td:hover {
            background-color: var(--orange-glow);
            cursor: default;
            transform: scale(1.02);
        }

        body.dark-mode .comparison-table td:hover {
            background-color: #2a4365;
        }

        /* Thesis framework visualization */
        .thesis-framework {
            display: flex;
            flex-direction: column;
            gap: 15px;
            margin: 25px 0;
            position: relative;
        }

        .framework-step {
            display: flex;
            align-items: center;
            padding: 20px;
            border-radius: var(--border-radius);
            background: #e9ecef;
            transition: var(--transition-smooth);
            position: relative;
            z-index: 2;
        }

        .framework-step:hover {
            background: var(--orange-glow);
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .framework-step {
            background: #4a5568;
        }

        body.dark-mode .framework-step:hover {
            background: #2a4365;
        }

        .framework-step-number {
            display: flex;
            justify-content: center;
            align-items: center;
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: white;
            border-radius: 50%;
            font-weight: bold;
            margin-right: 15px;
            flex-shrink: 0;
            transition: var(--transition-smooth);
        }

        .framework-step:hover .framework-step-number {
            background: var(--secondary);
            transform: scale(1.1);
        }

        .framework-step-content {
            flex-grow: 1;
        }

        .framework-arrow {
            position: absolute;
            left: 30px;
            height: 20px;
            width: 2px;
            background: var(--primary);
            z-index: 1;
        }

        .framework-step:nth-child(1) .framework-arrow {
            top: 60px;
            height: 25px;
        }

        .framework-step:nth-child(2) .framework-arrow {
            top: 60px;
            height: 25px;
        }

        .framework-step:nth-child(3) .framework-arrow {
            top: 60px;
            height: 25px;
        }

        .framework-step:nth-child(4) .framework-arrow {
            top: 60px;
            height: 25px;
        }

        /* Thesis builder interactive tool */
        .thesis-builder {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .thesis-builder:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .thesis-builder {
            background: #2d3748;
            border-color: var(--primary-light);
        }

        .thesis-builder h3 {
            color: var(--primary);
            margin-bottom: 20px;
            text-align: center;
            transition: var(--transition-smooth);
        }

        body.dark-mode .thesis-builder h3 {
            color: var(--primary-light);
        }

        .builder-step {
            margin-bottom: 20px;
        }

        .builder-step label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition-smooth);
        }

        body.dark-mode .builder-step label {
            color: var(--primary-light);
        }

        .builder-step input, .builder-step textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1em;
            transition: var(--transition-smooth);
        }

        .builder-step input:focus, .builder-step textarea:focus {
            border-color: var(--secondary);
            outline: none;
            box-shadow: 0 0 0 3px var(--orange-glow);
        }

        body.dark-mode .builder-step input, 
        body.dark-mode .builder-step textarea {
            background: #3a4356;
            border-color: #555;
            color: #f0f0f0;
        }

        .thesis-preview {
            background: white;
            border-left: 4px solid var(--accent);
            padding: 20px;
            border-radius: 5px;
            margin-top: 20px;
            min-height: 100px;
            transition: var(--transition-smooth);
        }

        body.dark-mode .thesis-preview {
            background: #3a4356;
            border-left-color: #6a7fdb;
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px;
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px;
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            .thesis-framework {
                gap: 20px;
            }
            
            .framework-step {
                flex-direction: column;
                text-align: center;
            }
            
            .framework-step-number {
                margin-right: 0;
                margin-bottom: 10px;
            }
            
            .framework-arrow {
                display: none;
            }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .sidebar-link, .btn, .framework-step {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .thesis-builder {
                border: 1px solid #000 !important;
                background: white !important;
                color: black !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-8.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
            --citation-color: #fff3cd;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px;
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* Progress Bar at very top */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-label {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-label {
            color: var(--primary-light);
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .example-box strong {
            color: #1565c0;
            font-style: normal;
        }

        body.dark-mode .example-box strong {
            color: #90cdf4;
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Research Insight";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .practice-item strong {
            color: #856404;
            display: block;
            margin-bottom: 8px;
            font-size: 1.1em;
        }

        body.dark-mode .practice-item strong {
            color: #f9c74f;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
            margin: 5px;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Enhanced Difficulty Labels */
        .difficulty-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .difficulty-easy {
            background-color: #d4edda;
            color: #155724;
        }

        .difficulty-easy:hover {
            background-color: var(--success);
            color: white;
            transform: scale(1.05);
        }

        .difficulty-medium {
            background-color: #fff3cd;
            color: #856404;
        }

        .difficulty-medium:hover {
            background-color: var(--warning);
            color: #333;
            transform: scale(1.05);
        }

        .difficulty-hard {
            background-color: #f8d7da;
            color: #721c24;
        }

        .difficulty-hard:hover {
            background-color: var(--danger);
            color: white;
            transform: scale(1.05);
        }

        /* Enhanced Tables */
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 1em;
            box-shadow: var(--shadow-soft);
            border-radius: var(--border-radius);
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        .comparison-table:hover {
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .comparison-table {
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        .comparison-table th {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 15px 10px;
            font-weight: bold;
            text-align: left;
        }

        .comparison-table td {
            padding: 12px 10px;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
            transition: var(--transition-quick);
        }

        body.dark-mode .comparison-table td {
            background-color: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        .comparison-table td:hover {
            background-color: var(--orange-glow);
            cursor: default;
            transform: scale(1.02);
        }

        body.dark-mode .comparison-table td:hover {
            background-color: #2a4365;
        }

        /* Enhanced Paragraph anatomy visualization */
        .paragraph-anatomy {
            border: 2px solid var(--primary);
            border-radius: var(--border-radius);
            padding: 25px;
            margin: 25px 0;
            background: white;
            transition: var(--transition-smooth);
        }

        .paragraph-anatomy:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .paragraph-anatomy {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .sentence {
            padding: 10px;
            margin: 10px 0;
            border-radius: 5px;
            transition: var(--transition-smooth);
        }

        .sentence:hover {
            transform: translateX(5px);
            box-shadow: var(--shadow-soft);
        }

        .topic-sentence {
            background-color: #ffeaa7;
            border-left: 4px solid #fdcb6e;
        }

        body.dark-mode .topic-sentence {
            background-color: #5a4a1f;
            border-left: 4px solid #f9c74f;
        }

        .supporting-sentence {
            background-color: #d8f8ff;
            border-left: 4px solid #81ecec;
            margin-left: 20px;
        }

        body.dark-mode .supporting-sentence {
            background-color: #1e3a3a;
            border-left: 4px solid #81ecec;
        }

        .concluding-sentence {
            background-color: #ffebee;
            border-left: 4px solid #ff7675;
        }

        body.dark-mode .concluding-sentence {
            background-color: #4a2f32;
            border-left: 4px solid #ff7675;
        }

        .sentence-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .sentence-label:hover {
            transform: scale(1.05);
        }

        /* Enhanced Pattern visualization */
        .pattern-visualization {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin: 25px 0;
        }

        .pattern {
            display: flex;
            align-items: center;
            padding: 15px;
            border-radius: var(--border-radius);
            background: #e9ecef;
            transition: var(--transition-smooth);
        }

        .pattern:hover {
            background: var(--orange-glow);
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .pattern {
            background: #4a5568;
        }

        body.dark-mode .pattern:hover {
            background: #2a4365;
        }

        .pattern-label {
            font-weight: bold;
            color: var(--primary);
            min-width: 120px;
            margin-right: 15px;
            transition: var(--transition-smooth);
        }

        .pattern:hover .pattern-label {
            color: var(--secondary);
        }

        body.dark-mode .pattern-label {
            color: var(--primary-light);
        }

        .pattern-description {
            flex-grow: 1;
        }

        /* Enhanced Paragraph builder */
        .paragraph-builder {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .paragraph-builder:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .paragraph-builder {
            background: #2d3748;
            border-color: var(--primary-light);
        }

        .paragraph-builder h3 {
            color: var(--primary);
            margin-bottom: 20px;
            text-align: center;
            transition: var(--transition-smooth);
        }

        body.dark-mode .paragraph-builder h3 {
            color: var(--primary-light);
        }

        .builder-step {
            margin-bottom: 20px;
        }

        .builder-step label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition-smooth);
        }

        body.dark-mode .builder-step label {
            color: var(--primary-light);
        }

        .builder-step input, .builder-step textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1em;
            transition: var(--transition-smooth);
        }

        .builder-step input:focus, .builder-step textarea:focus {
            border-color: var(--secondary);
            outline: none;
            box-shadow: 0 0 0 3px var(--orange-glow);
        }

        body.dark-mode .builder-step input, 
        body.dark-mode .builder-step textarea {
            background: #3a4356;
            border-color: #555;
            color: #f0f0f0;
        }

        .paragraph-preview {
            background: white;
            border-left: 4px solid var(--accent);
            padding: 20px;
            border-radius: 5px;
            margin-top: 20px;
            min-height: 100px;
            transition: var(--transition-smooth);
        }

        body.dark-mode .paragraph-preview {
            background: #3a4356;
            border-left-color: #6a7fdb;
        }

        /* Enhanced Citation box */
        .citation-box {
            background-color: #f9f9f9;
            border-left: 4px solid #6c757d;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 30px 0;
            font-size: 0.9em;
            transition: var(--transition-smooth);
        }

        .citation-box:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .citation-box {
            background-color: #2d3748;
            border-left-color: #a0aec0;
        }

        .citation-box p {
            margin: 0 0 10px 0;
            line-height: 1.5;
        }

        .citation-box a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition-smooth);
        }

        body.dark-mode .citation-box a {
            color: var(--primary-light);
        }

        .citation-box a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px;
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px;
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            .pattern {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .pattern-label {
                margin-bottom: 10px;
            }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .sidebar-link, .btn, .pattern {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .paragraph-builder {
                border: 1px solid #000 !important;
                background: white !important;
                color: black !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    

/* ===================== chapter-9.css ===================== */

        :root {
            --primary: #4a6fa5;
            --primary-dark: #345280;
            --primary-light: #6a8ec7;
            --secondary: #ff8c42;
            --secondary-light: #ffab70;
            --accent: #6a7fdb;
            --light: #f8f9fa;
            --dark: #222;
            --dark-secondary: #333;
            --dark-text: #f0f0f0;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --dark-gray: #444;
            --orange-glow: rgba(255, 140, 66, 0.15);
            --orange-hover: rgba(255, 140, 66, 0.8);
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-quick: all 0.15s ease-out;
            --shadow-soft: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-medium: 0 5px 25px rgba(0,0,0,0.15);
            --border-radius: 8px;
            --min-touch-target: 44px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            background-color: var(--light);
            color: var(--dark);
            font-size: 18px;
            padding: 0;
            margin: 0;
            background-image: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            min-height: 100vh;
            transition: var(--transition-smooth);
            padding-top: 70px;
            opacity: 0;
            animation: fadeInPage 0.6s ease-out forwards;
        }

        @keyframes fadeInPage {
            to { opacity: 1; }
        }

        body.dark-mode {
            background-color: var(--dark);
            color: var(--dark-text);
            background-image: linear-gradient(to bottom, #222, #333);
        }

        /* Progress Bar at very top */
        .progress-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: transparent;
            z-index: 1000;
        }

        .progress-bar {
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            width: 0%;
            transition: width 0.3s ease;
        }

        /* Enhanced Navigation Styles */
        .navbar {
            position: fixed;
            top: 5px;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-soft);
            padding: 15px 0;
            z-index: 1000;
            transition: var(--transition-smooth);
        }

        body.dark-mode .navbar {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .navbar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hamburger-menu {
            background: none;
            border: none;
            cursor: pointer;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }

        .hamburger-menu:hover {
            background-color: var(--orange-glow);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .hamburger-menu:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        body.dark-mode .hamburger-menu:hover {
            background-color: var(--dark-gray);
        }

        .hamburger-menu .bar {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition-smooth);
            border-radius: 1px;
        }

        body.dark-mode .hamburger-menu .bar {
            background-color: var(--primary-light);
        }

        .hamburger-menu.active .bar:nth-child(1) {
            transform: rotate(-45deg) translate(-6px, 6px);
        }

        .hamburger-menu.active .bar:nth-child(2) {
            opacity: 0;
        }

        .hamburger-menu.active .bar:nth-child(3) {
            transform: rotate(45deg) translate(-6px, -6px);
        }

        .navbar-brand {
            font-weight: bold;
            color: var(--primary);
            text-decoration: none;
            font-size: 1.2em;
            display: flex;
            align-items: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            transition: var(--transition-smooth);
            padding: 8px 16px;
            border-radius: var(--border-radius);
        }

        .navbar-brand:hover {
            color: var(--secondary);
            text-decoration: none;
            background-color: var(--orange-glow);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode .navbar-brand {
            color: var(--primary-light);
        }

        body.dark-mode .navbar-brand:hover {
            color: var(--secondary-light);
        }

        .navbar-brand i {
            margin-right: 8px;
            font-size: 1.1em;
        }

        /* Enhanced Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 0;
            left: -350px;
            width: 350px;
            height: 100vh;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(15px);
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1001;
            overflow-y: auto;
            overflow-x: hidden;
        }

        body.dark-mode .sidebar {
            background: rgba(51, 51, 51, 0.98);
            box-shadow: 2px 0 20px rgba(0,0,0,0.3);
        }

        .sidebar.active {
            left: 0;
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 1002;
        }

        .sidebar-close {
            background: none;
            border: none;
            color: white;
            font-size: 1.5em;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--border-radius);
            transition: var(--transition-smooth);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidebar-close:hover {
            background-color: rgba(255,255,255,0.2);
            transform: rotate(90deg);
        }

        .sidebar-content {
            padding: 20px 0;
        }

        .sidebar-section {
            margin-bottom: 30px;
        }

        .sidebar-section h3 {
            padding: 0 20px 10px;
            color: var(--gray);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-bottom: 1px solid var(--light-gray);
            margin-bottom: 15px;
            font-weight: 600;
        }

        body.dark-mode .sidebar-section h3 {
            color: #aaa;
            border-bottom-color: #444;
        }

        .sidebar-link {
            display: block;
            padding: 15px 20px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition-smooth);
            border-left: 3px solid transparent;
            position: relative;
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
        }

        body.dark-mode .sidebar-link {
            color: var(--dark-text);
        }

        .sidebar-link:hover {
            background-color: var(--orange-glow);
            color: var(--secondary);
            text-decoration: none;
            border-left-color: var(--secondary);
            transform: translateX(5px);
            box-shadow: inset 0 0 20px var(--orange-glow);
        }

        body.dark-mode .sidebar-link:hover {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
        }

        .sidebar-link.current {
            background-color: var(--orange-glow);
            color: var(--secondary);
            border-left-color: var(--secondary);
            font-weight: 600;
            box-shadow: inset 0 0 15px var(--orange-glow);
        }

        body.dark-mode .sidebar-link.current {
            background-color: var(--dark-gray);
            color: var(--secondary-light);
            border-left-color: var(--secondary-light);
        }

        .sidebar-link i {
            margin-right: 12px;
            width: 20px;
            text-align: center;
            font-size: 1.1em;
        }

        .reading-time {
            font-size: 0.75em;
            color: var(--gray);
            opacity: 0.8;
            margin-left: auto;
            padding-left: 10px;
        }

        /* Enhanced Overlay */
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(3px);
        }

        .sidebar-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Enhanced Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-medium);
            margin-top: 30px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .container {
            background-color: var(--dark-secondary);
            box-shadow: 0 5px 25px rgba(0,0,0,0.3);
        }

        .container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--accent), var(--secondary));
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        h1 {
            color: var(--primary);
            font-size: 2.8em;
            margin-bottom: 10px;
            padding-bottom: 15px;
            position: relative;
            display: inline-block;
            transition: var(--transition-smooth);
        }

        h1:hover {
            color: var(--secondary);
            text-shadow: 0 0 20px var(--orange-glow);
        }

        body.dark-mode h1 {
            color: var(--primary-light);
        }

        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--accent));
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        h1:hover::after {
            width: 120px;
            background: linear-gradient(to right, var(--secondary), var(--accent));
        }

        .subtitle {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--gray);
            font-size: 1.2em;
            transition: var(--transition-smooth);
        }

        body.dark-mode .subtitle {
            color: #aaa;
        }

        /* Enhanced Stats Bar */
        .stats-bar {
            display: flex;
            justify-content: space-around;
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow-soft);
            transition: var(--transition-smooth);
        }

        .stats-bar:hover {
            box-shadow: var(--shadow-medium);
            transform: translateY(-2px);
        }

        body.dark-mode .stats-bar {
            background: var(--dark-gray);
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        .stat {
            text-align: center;
            transition: var(--transition-smooth);
            padding: 10px;
            border-radius: var(--border-radius);
        }

        .stat:hover {
            background-color: var(--orange-glow);
            transform: scale(1.05);
        }

        .stat-label {
            font-size: 1.1em;
            font-weight: bold;
            color: var(--primary);
            display: block;
        }

        body.dark-mode .stat-label {
            color: var(--primary-light);
        }

        /* Enhanced Sections */
        .section {
            margin-bottom: 25px;
            background: #fff;
            border: 2px solid var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        body.dark-mode .section {
            background: var(--dark-secondary);
            border-color: #444;
        }

        .section:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--orange-hover);
        }

        body.dark-mode .section:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .section-header {
            background-color: var(--primary);
            color: white;
            padding: 20px;
            font-weight: bold;
            font-size: 1.3em;
            cursor: pointer;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .section-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,140,66,0.3), transparent);
            transition: left 0.6s;
        }

        .section-header:hover::before {
            left: 100%;
        }

        .section-header:hover {
            background-color: var(--secondary);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .section-icon {
            transition: var(--transition-smooth);
            font-size: 1.2em;
        }

        .section.active .section-icon {
            transform: rotate(90deg);
            color: var(--secondary-light);
        }

        .section-content {
            padding: 25px;
            font-size: 1.1em;
            line-height: 1.7;
            transition: var(--transition-smooth);
            display: none;
        }

        .section.active .section-content {
            display: block;
            animation: fadeInContent 0.5s ease-out;
        }

        @keyframes fadeInContent {
            from { 
                opacity: 0; 
                transform: translateY(10px); 
            }
            to { 
                opacity: 1; 
                transform: translateY(0); 
            }
        }

        body.dark-mode .section-content {
            color: var(--dark-text);
        }

        .section-content p {
            margin: 0 0 15px 0;
        }
        
        .section-content ul, .section-content ol {
            padding-left: 25px;
            margin: 15px 0;
        }
        
        .section-content li {
            margin-bottom: 10px;
            font-size: 1.05em;
        }

        /* Enhanced Interactive Elements */
        .example-box, .highlight-box, .tools-note, .practice-item, .key-takeaway {
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .example-box:hover, .highlight-box:hover, .tools-note:hover, .practice-item:hover, .key-takeaway:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .example-box {
            background-color: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            font-style: italic;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .example-box {
            background-color: #2a4365;
            color: #e3f2fd;
            border-left-color: var(--primary-light);
        }

        .example-box::before {
            content: "Example";
            position: absolute;
            top: -12px;
            left: 15px;
            background: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8em;
            font-style: normal;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .example-box:hover::before {
            background: var(--secondary);
        }

        body.dark-mode .example-box::before {
            background: var(--primary-light);
        }

        .example-box strong {
            color: #1565c0;
            font-style: normal;
        }

        body.dark-mode .example-box strong {
            color: #90cdf4;
        }

        .highlight-box {
            background-color: #d1ecf1;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border: 1px solid #bee5eb;
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .highlight-box {
            background-color: #1c3a4f;
            color: #d1ecf1;
            border-color: #2c5282;
        }

        .highlight-box::before {
            content: "Research Insight";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--accent);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .highlight-box:hover::before {
            background: var(--secondary);
        }

        .tools-note {
            background-color: #d4edda;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 3px solid var(--success);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .tools-note {
            background-color: #1d3a2d;
            color: #d4edda;
            border-left-color: #38a169;
        }

        .tools-note::before {
            content: "Toolkit";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--success);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .tools-note:hover::before {
            background: var(--secondary);
        }

        .practice-item {
            background-color: #fff3cd;
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            border-left: 4px solid var(--warning);
            position: relative;
            transition: var(--transition-smooth);
        }

        body.dark-mode .practice-item {
            background-color: #5a4a1f;
            color: #ffeaa7;
            border-left-color: #f9c74f;
        }

        .practice-item::before {
            content: "Practice";
            position: absolute;
            top: -10px;
            left: 15px;
            background: var(--warning);
            color: #333;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            font-weight: bold;
            transition: var(--transition-smooth);
        }

        .practice-item:hover::before {
            background: var(--secondary);
            color: white;
        }

        .practice-item strong {
            color: #856404;
            display: block;
            margin-bottom: 8px;
            font-size: 1.1em;
        }

        body.dark-mode .practice-item strong {
            color: #f9c74f;
        }

        .key-takeaway {
            background-color: #f8f9fa;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            transition: var(--transition-smooth);
        }

        body.dark-mode .key-takeaway {
            background-color: #2d3748;
            color: #e2e8f0;
        }

        .key-takeaway h4 {
            color: var(--accent);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .key-takeaway:hover h4 {
            color: var(--secondary);
        }

        .key-takeaway h4 i {
            margin-right: 10px;
        }

        /* Enhanced Interactive Elements */
        .interactive-element {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 15px;
            margin: 20px 0;
            border: 2px dashed var(--primary);
            transition: var(--transition-smooth);
        }

        .interactive-element:hover {
            border-color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .interactive-element {
            background: var(--dark-gray);
            border-color: var(--primary-light);
        }

        .interactive-element h3 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .interactive-element:hover h3 {
            color: var(--secondary);
        }

        body.dark-mode .interactive-element h3 {
            color: var(--primary-light);
        }

        .interactive-element h3 i {
            margin-right: 10px;
        }

        /* Enhanced Buttons */
        .btn, .video-link {
            display: inline-flex;
            align-items: center;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition-smooth);
            min-height: var(--min-touch-target);
            position: relative;
            overflow: hidden;
            margin: 5px;
        }

        .btn::before, .video-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.6s;
        }

        .btn:hover::before, .video-link:hover::before {
            left: 100%;
        }

        .btn:hover, .video-link:hover {
            background: var(--secondary);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        .video-link {
            margin-top: 15px;
        }

        .video-link i, .btn i {
            margin-right: 8px;
        }

        /* Enhanced Quick Navigation */
        .quick-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 15px 10px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            transition: var(--transition-smooth);
        }

        body.dark-mode .quick-nav {
            background: rgba(51, 51, 51, 0.95);
            box-shadow: 0 3px 15px rgba(0,0,0,0.3);
        }

        .quick-nav a {
            display: block;
            text-align: center;
            margin: 8px 0;
            color: var(--primary);
            font-size: 1.5em;
            text-decoration: none;
            position: relative;
            transition: var(--transition-smooth);
            padding: 8px;
            border-radius: var(--border-radius);
            min-width: var(--min-touch-target);
            min-height: var(--min-touch-target);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .quick-nav a:hover {
            color: var(--secondary);
            background-color: var(--orange-glow);
            transform: scale(1.1);
            box-shadow: 0 0 15px var(--orange-glow);
        }

        .quick-nav a.active {
            color: var(--secondary);
            background-color: var(--orange-glow);
            box-shadow: 0 0 10px var(--orange-glow);
        }

        body.dark-mode .quick-nav a {
            color: var(--primary-light);
        }

        .quick-nav a span {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background: var(--dark);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.6em;
            opacity: 0;
            transition: var(--transition-smooth);
            pointer-events: none;
            white-space: nowrap;
            margin-right: 10px;
        }

        body.dark-mode .quick-nav a span {
            background: var(--dark-text);
            color: var(--dark);
        }

        .quick-nav a:hover span {
            opacity: 1;
            transform: translateY(-50%) translateX(-5px);
        }

        /* Enhanced Dark Mode Toggle */
        .dark-mode-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            border: none;
        }

        .dark-mode-toggle:hover {
            background: var(--secondary);
            transform: scale(1.1) rotate(180deg);
            box-shadow: 0 0 25px var(--orange-glow);
        }

        .dark-mode-toggle:focus {
            outline: 2px solid var(--secondary);
            outline-offset: 3px;
        }

        /* Back to Top Button */
        .back-to-top {
            position: fixed;
            bottom: 90px;
            right: 20px;
            background: var(--accent);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: var(--shadow-soft);
            z-index: 999;
            transition: var(--transition-smooth);
            opacity: 0;
            visibility: hidden;
            border: none;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: scale(1.1) translateY(-3px);
            box-shadow: 0 0 20px var(--orange-glow);
        }

        /* Enhanced Difficulty Labels */
        .difficulty-label {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: bold;
            margin-right: 10px;
            transition: var(--transition-smooth);
        }

        .difficulty-easy {
            background-color: #d4edda;
            color: #155724;
        }

        .difficulty-easy:hover {
            background-color: var(--success);
            color: white;
            transform: scale(1.05);
        }

        .difficulty-medium {
            background-color: #fff3cd;
            color: #856404;
        }

        .difficulty-medium:hover {
            background-color: var(--warning);
            color: #333;
            transform: scale(1.05);
        }

        .difficulty-hard {
            background-color: #f8d7da;
            color: #721c24;
        }

        .difficulty-hard:hover {
            background-color: var(--danger);
            color: white;
            transform: scale(1.05);
        }

        /* Enhanced Tables */
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 1em;
            box-shadow: var(--shadow-soft);
            border-radius: var(--border-radius);
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        .comparison-table:hover {
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .comparison-table {
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        .comparison-table th {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 15px 10px;
            font-weight: bold;
            text-align: left;
        }

        .comparison-table td {
            padding: 12px 10px;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
            transition: var(--transition-quick);
        }

        body.dark-mode .comparison-table td {
            background-color: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        .comparison-table td:hover {
            background-color: var(--orange-glow);
            cursor: default;
            transform: scale(1.02);
        }

        body.dark-mode .comparison-table td:hover {
            background-color: #2a4365;
        }

        /* Enhanced Cluster diagram */
        .cluster-container {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            min-height: 400px;
            position: relative;
            transition: var(--transition-smooth);
            user-select: none;
        }

        .cluster-container:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .cluster-container {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .cluster-node {
            position: absolute;
            padding: 10px 15px;
            border-radius: 20px;
            background: #e3f2fd;
            border: 2px solid var(--primary);
            cursor: move;
            user-select: none;
            z-index: 2;
            transition: var(--transition-smooth);
            min-width: 80px;
            text-align: center;
            box-shadow: var(--shadow-soft);
            font-size: 0.9em;
        }

        .cluster-node:hover {
            transform: scale(1.05);
            box-shadow: var(--shadow-medium);
            background: var(--orange-glow);
        }

        body.dark-mode .cluster-node {
            background: #2a4365;
            border-color: var(--primary-light);
            color: #e3f2fd;
        }

        .cluster-center {
            background: var(--primary);
            color: white;
            font-weight: bold;
            font-size: 1em;
        }

        .cluster-center:hover {
            background: var(--secondary);
        }

        body.dark-mode .cluster-center {
            background: var(--primary-light);
        }

        .cluster-connection {
            position: absolute;
            background: var(--primary);
            height: 2px;
            transform-origin: 0 0;
            z-index: 1;
            transition: var(--transition-smooth);
        }

        body.dark-mode .cluster-connection {
            background: var(--primary-light);
        }

        .cluster-tools {
            display: flex;
            gap: 10px;
            margin-bottom: 15px;
            flex-wrap: wrap;
        }

        .editable-node {
            background: transparent;
            border: none;
            outline: none;
            text-align: center;
            font-family: inherit;
            font-size: inherit;
            color: inherit;
            width: 100%;
        }

        /* Enhanced Freewriting tool */
        .freewriting-container {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .freewriting-container:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .freewriting-container {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .freewriting-timer {
            font-size: 2em;
            text-align: center;
            margin: 15px 0;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition-smooth);
        }

        body.dark-mode .freewriting-timer {
            color: var(--primary-light);
        }

        .freewriting-textarea {
            width: 100%;
            min-height: 200px;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1em;
            resize: vertical;
            transition: var(--transition-smooth);
        }

        .freewriting-textarea:focus {
            border-color: var(--secondary);
            outline: none;
            box-shadow: 0 0 0 3px var(--orange-glow);
        }

        body.dark-mode .freewriting-textarea {
            background: #3a4356;
            border-color: #555;
            color: #f0f0f0;
        }

        .freewriting-controls {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 15px;
            flex-wrap: wrap;
        }

        /* Enhanced Outline builder */
        .outline-builder {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .outline-builder:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .outline-builder {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .outline-item {
            padding: 10px;
            margin: 5px 0;
            border: 1px solid #ddd;
            border-radius: 5px;
            background: #f8f9fa;
            cursor: move;
            transition: var(--transition-smooth);
        }

        .outline-item:hover {
            background: var(--orange-glow);
            transform: translateX(5px);
            box-shadow: var(--shadow-soft);
        }

        body.dark-mode .outline-item {
            background: #3a4356;
            border-color: #555;
            color: #f0f0f0;
        }

        .outline-level-1 {
            font-weight: bold;
            margin-left: 0;
        }

        .outline-level-2 {
            margin-left: 20px;
        }

        .outline-level-3 {
            margin-left: 40px;
            font-style: italic;
        }

        .outline-tools {
            display: flex;
            gap: 10px;
            margin-bottom: 15px;
            flex-wrap: wrap;
        }

        /* Enhanced Question prompter */
        .question-prompter {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 25px 0;
            border: 2px solid var(--primary);
            transition: var(--transition-smooth);
        }

        .question-prompter:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .question-prompter {
            background: var(--dark-secondary);
            border-color: var(--primary-light);
        }

        .question-card {
            background: #e3f2fd;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 15px 0;
            text-align: center;
            font-size: 1.2em;
            font-weight: bold;
            transition: var(--transition-smooth);
            min-height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .question-card:hover {
            background: var(--orange-glow);
            transform: scale(1.02);
        }

        body.dark-mode .question-card {
            background: #2a4365;
            color: #e3f2fd;
        }

        .question-controls {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 15px;
            flex-wrap: wrap;
        }

        /* Enhanced List maker */
        .list-container {
            display: flex;
            gap: 15px;
            margin-top: 15px;
        }

        .list-column {
            flex: 1;
            min-height: 200px;
        }

        .list-column h4 {
            margin-bottom: 10px;
            color: var(--primary);
            transition: var(--transition-smooth);
        }

        body.dark-mode .list-column h4 {
            color: var(--primary-light);
        }

        .drop-zone {
            min-height: 150px;
            padding: 15px;
            border: 2px dashed #ddd;
            border-radius: 5px;
            transition: var(--transition-smooth);
            background: #f8f9fa;
        }

        .drop-zone.drag-over {
            border-color: var(--secondary);
            background: var(--orange-glow);
        }

        body.dark-mode .drop-zone {
            background: #3a4356;
            border-color: #555;
        }

        .list-item {
            background: white;
            padding: 8px 12px;
            margin: 5px 0;
            border-radius: 4px;
            border: 1px solid #ddd;
            cursor: move;
            transition: var(--transition-smooth);
            user-select: none;
        }

        .list-item:hover {
            background: var(--orange-glow);
            transform: scale(1.02);
            box-shadow: var(--shadow-soft);
        }

        body.dark-mode .list-item {
            background: var(--dark-gray);
            border-color: #555;
            color: var(--dark-text);
        }

        .list-item.dragging {
            opacity: 0.5;
            transform: scale(1.05);
        }

        /* Enhanced Citation box */
        .citation-box {
            background-color: #f9f9f9;
            border-left: 4px solid #6c757d;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 30px 0;
            font-size: 0.9em;
            transition: var(--transition-smooth);
        }

        .citation-box:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        body.dark-mode .citation-box {
            background-color: #2d3748;
            border-left-color: #a0aec0;
        }

        .citation-box p {
            margin: 0 0 10px 0;
            line-height: 1.5;
        }

        .citation-box a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition-smooth);
        }

        body.dark-mode .citation-box a {
            color: var(--primary-light);
        }

        .citation-box a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }

        /* Responsive Design - Mobile First */
        @media (max-width: 480px) {
            body {
                font-size: 16px;
                padding-top: 65px;
            }
            
            .navbar {
                padding: 8px 0;
                top: 5px;
            }
            
            .navbar-content {
                padding: 0 15px;
            }
            
            .sidebar {
                width: 280px;
                left: -280px;
            }
            
            .container {
                padding: 15px;
                margin: 10px;
                width: auto;
            }
            
            h1 {
                font-size: 1.8em;
            }
            
            .stats-bar {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            
            .quick-nav {
                display: none;
            }

            .dark-mode-toggle {
                width: 50px;
                height: 50px;
                bottom: 15px;
                right: 15px;
            }

            .back-to-top {
                bottom: 75px;
                right: 15px;
                width: 45px;
                height: 45px;
            }

            .freewriting-controls, .question-controls, .cluster-tools, .outline-tools {
                flex-direction: column;
                align-items: stretch;
            }

            .list-container {
                flex-direction: column;
            }
        }

        @media (max-width: 768px) and (min-width: 481px) {
            .sidebar {
                width: 320px;
                left: -320px;
            }

            .container {
                padding: 20px;
                margin: 15px;
            }

            h1 {
                font-size: 2.2em;
            }
        }

        /* Touch gestures for mobile */
        @media (hover: none) and (pointer: coarse) {
            .section-header, .sidebar-link, .btn, .cluster-node, .list-item {
                -webkit-tap-highlight-color: rgba(255, 140, 66, 0.3);
            }
        }

        /* Print Styles */
        @media print {
            .navbar, .sidebar, .sidebar-overlay, .dark-mode-toggle, .quick-nav, .video-link, .btn, .back-to-top, .progress-container {
                display: none !important;
            }
            
            body {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                padding-top: 0 !important;
                font-size: 12pt !important;
            }
            
            .container {
                background: white !important;
                color: black !important;
                box-shadow: none !important;
                max-width: none !important;
                margin: 0 !important;
                padding: 0 !important;
            }
            
            .section-header {
                background: #ddd !important;
                color: black !important;
                page-break-after: avoid;
            }
            
            .section-content {
                display: block !important;
                page-break-inside: avoid;
            }

            .example-box, .highlight-box, .tools-note, .practice-item {
                page-break-inside: avoid;
                border: 1px solid #ddd !important;
            }

            .cluster-container, .freewriting-container, .outline-builder, .question-prompter {
                border: 1px solid #000 !important;
                background: white !important;
                color: black !important;
            }
        }

        /* Accessibility Enhancements */
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            :root {
                --primary: #0000cc;
                --secondary: #ff6600;
                --light-gray: #cccccc;
                --dark-gray: #333333;
            }
        }

        /* Focus visible for better keyboard navigation */
        *:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 2px;
        }
    


/* ===================== Fixes (Stabilization Patch) ===================== */
/* Footer should not inherit the card-style .container background */
.footer .container {
  background: transparent !important;
  box-shadow: none !important;
  border-radius: 0 !important;
  margin-top: 0 !important;
  margin-bottom: 0 !important;
  padding: 0 !important;
  overflow: visible !important;
}
.footer .container::before { display: none !important; }

/* Index progress card uses its own class to avoid conflict with top scroll bar */


/* ===================== Stabilization overrides (Phase A) ===================== */
/* Footer should not inherit the chapter "card" container styling */
.footer .container {
    background: transparent !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    padding: 0 !important;
    overflow: visible !important;
}
.footer .container::before { display: none !important; }

/* Index progress module uses .progress-card to avoid collision with top scroll bar styles */
.progress-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    margin: 30px 0;
    border-left: 4px solid var(--secondary);
    transition: box-shadow 0.3s, transform 0.3s;
}
.progress-card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
    transform: translateY(-2px);
}
body.dark-mode .progress-card {
    background: var(--dark-secondary);
    color: var(--dark-text);
}

/* Navbar: prevent hamburger/brand overlap.
   We keep the brand centered while positioning the hamburger on the left. */
.navbar-content {
    position: relative;
}

.hamburger-menu {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
}

.navbar-brand {
    position: relative !important;
    left: auto !important;
    transform: none !important;
    margin: 0 auto;
    white-space: nowrap;
}

@media (max-width: 520px) {
    .navbar-brand {
        font-size: 1.05em;
        padding: 6px 10px;
    }
}

/* ===================== v4 Fixes ===================== */
/* Only chapter headers use white text; index header stays dark-on-light */
/* Match both ENG 1010 (chapter-*) and ENG 1020 (1020-chapter-*) pages */
body[data-page*="chapter"] .header h1,
body[data-page*="chapter"] .header h1 i {
  color: #fff !important;
  opacity: 1 !important;
}
body[data-page*="chapter"] .header .subtitle {
  color: rgba(255,255,255,0.85) !important;
  opacity: 1 !important;
}



/* Navbar: hard-stop the hamburger/logo collision across all pages */
.navbar .navbar-content {
  position: relative !important;
  justify-content: center !important;
  width: 100% !important;
}
.navbar .hamburger-menu {
  position: absolute !important;
  left: 16px !important;
  top: 50% !important;
  transform: translateY(-50%) !important;
  z-index: 2000 !important;
}
.navbar .navbar-brand {
  position: static !important;
  left: auto !important;
  transform: none !important;
  margin: 0 !important;
}
@media (max-width: 520px) {
  .navbar .hamburger-menu { left: 12px !important; }
}
/* ===================== v9 Patch (2026-01-11): hero banner + rotating compass + mobile hamburger ===================== */

/* 1) Force the HOME hero to use the same dark blue banner treatment */
body[data-page="index"] .header{
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%) !important;
  color: #fff !important;
  padding: 60px 0 40px !important;
  margin-bottom: 30px !important;
  border-radius: 0 0 20px 20px !important;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1) !important;
  position: relative !important;
  overflow: hidden !important;
}
body.dark-mode[data-page="index"] .header{
  background: linear-gradient(135deg, var(--dark-secondary) 0%, var(--dark) 100%) !important;
}

/* Keep home hero text readable on the dark banner */
body[data-page="index"] .header h1,
body[data-page="index"] .header p{
  color: #fff !important;
  opacity: 1 !important;
}
body[data-page="index"] .header p{
  color: rgba(255,255,255,0.9) !important;
}

/* 2) Restore the “slowly rotating compass” feel site-wide */
/* (We animate any Font Awesome compass icon in key nav/header contexts.) */
.navbar-brand .fa-compass,
.sidebar-header .fa-compass,
.header .fa-compass{
  display: inline-block;
  animation: spin 20s linear infinite;
  transform-origin: 50% 50%;
}

/* 3) Mobile hamburger: ensure it’s always clickable and never covered */
.navbar{
  position: sticky;
  top: 0;
  z-index: 3000; /* above content + overlays */
}

.navbar .navbar-content{
  width: 100% !important;
  position: relative !important;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-left: 72px !important;  /* reserves space for hamburger */
  padding-right: 72px !important; /* keeps brand centered */
  box-sizing: border-box !important;
}

.navbar .hamburger-menu{
  position: absolute !important;
  left: 16px !important;
  top: 50% !important;
  transform: translateY(-50%) !important;
  z-index: 4000 !important; /* above brand */
}

.navbar .navbar-brand{
  max-width: calc(100% - 144px) !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  white-space: nowrap !important;
}

@media (max-width: 520px){
  .navbar .navbar-content{ padding-left: 64px !important; padding-right: 64px !important; }
  .navbar .navbar-brand{ max-width: calc(100% - 128px) !important; }
  .navbar .hamburger-menu{ left: 12px !important; }
}