:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --background-color: #eef2f7;
    --text-color: #444;
    --card-background: #f7f9fc;
    --border-color: #ddd;
    --code-background: #f0f3f8;
    --success-color: #2ecc71;
    --heading-color: var(--primary-color);
    --subheading-color: var(--secondary-color);
    --quiz-accent-color: #5d9cec;
    
    /* Neurodivergent-friendly design variables */
    --line-height: 1.6;
    --font-family: 'Lexend', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --focus-outline-color: #3498db;
    --focus-outline-width: 3px;
    --focus-background-color: rgba(52, 152, 219, 0.1);
    --highlight-color: rgba(241, 196, 15, 0.3);
    
    /* Matrix customization variables */
    --matrix-opacity: 1;
}

/* Import Lexend font */
@import url('https://fonts.googleapis.com/css2?family=Lexend:wght@300;400;500;600;700&display=swap');

/* Force animation refresh */
* {
    animation-play-state: running !important;
    animation-delay: 0s !important;
}

/* GitHub Button Styles */
.github-button-container {
    margin-right: 15px;
}

.github-button {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--secondary-color);
    color: white;
    padding: 8px 12px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.github-button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 3px 5px rgba(0, 0, 0, 0.1);
}

.github-button i {
    font-size: 1.2rem;
}

@media (max-width: 768px) {
    .github-button span {
        display: none;
    }
    
    .github-button {
        padding: 8px;
    }
    
    .github-button i {
        margin: 0;
    }
}

/* OpenDyslexic font with proper @font-face declarations */
@font-face {
    font-family: 'OpenDyslexic';
    src: url('https://cdn.jsdelivr.net/npm/open-dyslexic@1.0.3/open-dyslexic-regular.woff2') format('woff2'),
         url('https://cdn.jsdelivr.net/npm/open-dyslexic@1.0.3/open-dyslexic-regular.woff') format('woff');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'OpenDyslexic';
    src: url('https://cdn.jsdelivr.net/npm/open-dyslexic@1.0.3/open-dyslexic-bold.woff2') format('woff2'),
         url('https://cdn.jsdelivr.net/npm/open-dyslexic@1.0.3/open-dyslexic-bold.woff') format('woff');
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}

.dark-mode {
    --primary-color: #1a252f;
    --secondary-color: #2980b9;
    --accent-color: #c0392b;
    --background-color: #121212;
    --text-color: #eee;
    --card-background: #1e1e1e;
    --border-color: #444;
    --code-background: #2d2d2d;
    --focus-outline-color: #3498db;
    --focus-outline-width: 3px;
    --focus-background-color: rgba(52, 152, 219, 0.2);
    --highlight-color: rgba(241, 196, 15, 0.4);
    --heading-color: #66a3ff;
    --subheading-color: #7fdbff;
    --quiz-accent-color: #72c2e9;
}

/* High Contrast Mode */
.high-contrast-mode {
    --primary-color: #000;
    --secondary-color: #0066ff;
    --accent-color: #ff0000;
    --background-color: #fff;
    --text-color: #000;
    --card-background: #fff;
    --border-color: #000;
    --code-background: #f0f0f0;
    --success-color: #008000;
    --focus-outline-color: #ff6600;
    --focus-outline-width: 4px;
    --focus-background-color: rgba(255, 102, 0, 0.2);
    --highlight-color: rgba(255, 255, 0, 0.5);
}

/* Ensure header text is visible in high contrast mode */
.high-contrast-mode header {
    color: #000 !important;
    background-color: #fff !important;
}

.high-contrast-mode .logo h1 {
    color: #000 !important;
}

.high-contrast-mode .theme-toggle {
    color: #000 !important;
}

.high-contrast-mode .theme-toggle span {
    color: #000 !important;
}

/* Dark High Contrast Mode */
.dark-mode.high-contrast-mode {
    --primary-color: #fff;
    --secondary-color: #66ccff;
    --accent-color: #ff6666;
    --background-color: #000;
    --text-color: #fff;
    --card-background: #000;
    --border-color: #fff;
    --code-background: #333;
    --success-color: #00cc00;
    --focus-outline-color: #ffcc00;
    --focus-outline-width: 4px;
    --focus-background-color: rgba(255, 204, 0, 0.3);
    --highlight-color: rgba(255, 255, 0, 0.5);
}

/* Ensure header text is visible in dark high contrast mode */
.dark-mode.high-contrast-mode header {
    color: #fff !important;
    background-color: #000 !important;
}

.dark-mode.high-contrast-mode .logo h1 {
    color: #fff !important;
}

.dark-mode.high-contrast-mode .theme-toggle {
    color: #fff !important;
}

.dark-mode.high-contrast-mode .theme-toggle span {
    color: #fff !important;
}

/* Dyslexia-Friendly Font */
.dyslexia-font {
    --font-family: 'OpenDyslexic', 'Comic Sans MS', cursive;
    --line-height: 1.8;
}

/* Add more specific rules for dyslexic font to override any mobile specific styles */
html body.dyslexia-font,
html body.dyslexia-font * {
    font-family: 'OpenDyslexic', 'Comic Sans MS', sans-serif !important;
    line-height: 1.8 !important;
    letter-spacing: 0.05em !important;
    word-spacing: 0.1em !important;
}

/* Ensure mobile devices use the correct dyslexia font */
@media (max-width: 992px) {
    html body.dyslexia-font,
    html body.dyslexia-font * {
        font-family: 'OpenDyslexic', 'Comic Sans MS', sans-serif !important;
    }
}

/* Large Text Mode */
.large-text {
    font-size: 120%;
    --line-height: 1.8;
}

/* Extra Large Text Mode */
.extra-large-text {
    font-size: 140%;
    --line-height: 2;
}

/* Focus Mode */
.focus-mode .topic:not(.expanded) {
    opacity: 0.6;
    transition: opacity 0.3s;
}

.focus-mode .topic.expanded {
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.06);
    position: relative;
    z-index: 2;
}

/* Calm Mode - Reduced animations */
.calm-mode * {
    transition: none !important;
    animation: none !important;
}

.calm-mode .quiz-topic:before {
    animation: none !important;
}

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

body {
    font-family: var(--font-family);
    line-height: var(--line-height);
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s, font-size 0.3s;
}

.highlighted-text {
    background-color: var(--highlight-color);
    padding: 2px 4px;
    border-radius: 3px;
}

header {
    background-color: var(--primary-color);
    color: #f0f0f0; /* Changed from white to a light gray that will be visible on both dark and light backgrounds */
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.07);
    flex-wrap: wrap;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

@media (max-width: 992px) {
    header {
        justify-content: center;
        gap: 15px;
    }
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    animation: logoEntrance 1.5s ease-out forwards !important;
    position: relative;
    transform-origin: left center;
}

.logo i {
    font-size: 2rem;
    animation: logoIconPulse 2s ease-in-out infinite !important;
    color: var(--accent-color);
    transform-origin: center;
    display: inline-block; /* Ensures the transform works properly */
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 500;
    position: relative;
    overflow: hidden;
    color: #f0f0f0; /* Added explicit color to ensure visibility in high contrast mode */
    animation: textFadeIn 2s ease-in-out forwards !important;
}

/* Logo animations */
@keyframes logoEntrance {
    0% {
        opacity: 0;
        transform: translateY(-30px) scale(0.8);
    }
    50% {
        opacity: 0.8;
        transform: translateY(5px) scale(1.05);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes logoIconPulse {
    0% {
        transform: scale(1) rotate(0deg);
    }
    25% {
        transform: scale(1.2) rotate(-5deg);
    }
    50% {
        transform: scale(1.3) rotate(0deg);
    }
    75% {
        transform: scale(1.2) rotate(5deg);
    }
    100% {
        transform: scale(1) rotate(0deg);
    }
}

@keyframes textFadeIn {
    0% {
        opacity: 0;
        transform: translateX(20px);
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Header Controls Container */
.header-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.search-container {
    display: flex;
    align-items: center;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    max-width: 300px;
    width: 100%;
}

.search-container input {
    padding: 8px 12px;
    border: none;
    border-radius: 4px 0 0 4px;
    width: 100%;
    background-color: #f0f3f8;
    color: #333;
    font-size: 14px;
    transition: all 0.3s ease;
}

.search-container input:focus {
    outline: none;
    box-shadow: inset 0 0 0 2px var(--secondary-color);
}

.search-container button {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.search-container button:hover {
    background-color: #1a6aa8;
}

/* Dark mode styles for search */
.dark-mode .search-container input {
    background-color: #2a2a2a;
    color: #f0f3f8;
    border: 1px solid #444;
}

.dark-mode .search-container button {
    background-color: #3498db;
}

.dark-mode .search-container button:hover {
    background-color: #2980b9;
}

/* High contrast mode styles for search */
.high-contrast-mode .search-container input {
    background-color: #fff;
    color: #000;
    border: 2px solid #000;
}

.high-contrast-mode .search-container button {
    background-color: #000;
    color: #fff;
    border: 2px solid #000;
}

.dark-mode.high-contrast-mode .search-container input {
    background-color: #000;
    color: #fff;
    border: 2px solid #fff;
}

.dark-mode.high-contrast-mode .search-container button {
    background-color: #fff;
    color: #000;
    border: 2px solid #fff;
}

/* Theme Toggle in Header */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #f0f0f0; /* Changed from white to a light gray that will be visible on both dark and light backgrounds */
    font-size: 0.9rem;
    font-weight: 500;
}

.container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    min-height: 100vh;
    padding-top: 80px;
    padding-bottom: 150px;
}

.sidebar {
    width: 250px;
    background-color: #f7f9fc;
    padding: 2rem 0;
    border-right: 1px solid var(--border-color);
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 80px - 150px);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    z-index: 100;
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: 5px;
}

.nav-links a {
    display: block;
    padding: 10px 20px;
    color: var(--text-color);
    text-decoration: none;
    transition: background-color 0.2s;
    border-left: 3px solid transparent;
}

.nav-links a:hover {
    background-color: rgba(52, 152, 219, 0.05);
}

.nav-links a.active {
    border-left-color: var(--secondary-color);
    background-color: rgba(52, 152, 219, 0.08);
    font-weight: 500;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
}

/* When checked (dark mode), move slider right and change background */
input:checked + .slider {
    background-color: var(--secondary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

.content {
    flex: 1;
    padding: 2.5rem;
}

section {
    margin-bottom: 3rem;
    background-color: var(--card-background);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
    padding: 2rem;
}

section h2 {
    color: var(--heading-color);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    padding-top: 0.5rem;
    font-weight: 500;
    clear: both; /* Prevent overlap with other elements */
}

.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.topic-header i {
    transition: transform 0.3s;
}

.topic-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
}

.topic.expanded .topic-content {
    max-height: 10000px;
    transition: max-height 1s cubic-bezier(0, 1, 0, 1);
}

.topic.expanded .topic-header i {
    transform: rotate(180deg);
}

h3 {
    color: var(--subheading-color);
    margin: 1.5rem 0 1rem;
    font-weight: 500;
}

p {
    margin-bottom: 1rem;
}

ul, ol {
    margin-left: 20px;
    margin-bottom: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background-color: rgba(255, 255, 255, 0.4);
}

table, th, td {
    border: 1px solid var(--border-color);
}

th, td {
    padding: 8px 12px;
    text-align: left;
}

th {
    background-color: rgba(52, 152, 219, 0.08);
}

pre {
    background-color: var(--code-background);
    border-radius: 4px;
    padding: 1rem;
    margin: 1rem 0;
    overflow-x: auto;
    position: relative;
    border: 1px solid rgba(0, 0, 0, 0.04);
    white-space: pre-wrap;       /* CSS3 */
    word-wrap: break-word;       /* Internet Explorer 5.5+ */
    word-break: break-word;      /* Modern browsers */
}

.copy-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px 10px;
    font-size: 12px;
    cursor: pointer;
    opacity: 0.8;
}

.copy-btn:hover {
    opacity: 1;
}

.quiz-container {
    background-color: rgba(52, 152, 219, 0.1);
    border-left: 4px solid var(--secondary-color);
    padding: 1rem;
    margin: 1.5rem 0;
    border-radius: 4px;
}

.quiz-question {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.quiz-options {
    list-style-type: none;
    margin-left: 0;
}

.quiz-option {
    margin: 5px 0;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    background-color: rgba(255, 255, 255, 0.6);
    color: var(--text-color);
}

.quiz-option:hover {
    background-color: rgba(93, 156, 236, 0.2);
    border-color: var(--secondary-color);
}

.quiz-option.selected {
    background-color: rgba(46, 204, 113, 0.2);
    border-color: var(--success-color);
}

.quiz-option.wrong {
    background-color: rgba(93, 156, 236, 0.3);
    border-color: var(--quiz-accent-color);
}

.quiz-feedback {
    margin-top: 1rem;
    padding: 0.5rem;
    display: none;
}

.quiz-feedback.correct {
    display: block;
    background-color: rgba(46, 204, 113, 0.2);
    border-left: 4px solid var(--success-color);
}

.quiz-feedback.incorrect {
    display: block;
    background-color: rgba(93, 156, 236, 0.2);
    border-left: 4px solid var(--quiz-accent-color);
}

.quiz-button {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 1rem;
    font-weight: 500;
    font-family: 'Lexend', sans-serif;
}

.quiz-reset {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 1rem;
    font-weight: 500;
    font-family: 'Lexend', sans-serif;
    transition: background-color 0.2s;
}

.quiz-reset:hover {
    background-color: var(--accent-hover-color, #0056b3);
}

/* About page styling */
.about-intro {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--card-bg-color);
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.dark-mode .about-intro {
    color: #f0e6d2; /* Matching warm cream color */
}

.light-mode .about-intro, .about-intro {
    color: var(--text-color);
}

.about-intro p {
    font-size: 1.1rem;
    line-height: 1.6;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.feature-item {
    padding: 1.5rem;
    background-color: var(--card-bg-color);
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    z-index: 1;
}

/* Specific text color handling for dark/light modes */
.dark-mode .feature-item {
    color: #f0e6d2; /* Warm cream color for dark mode */
}

.light-mode .feature-item, .feature-item {
    color: var(--text-color);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 1rem;
}

.dark-mode .feature-icon {
    color: #e9b96e; /* Warm amber for icons in dark mode */
}

.light-mode .feature-icon, .feature-icon {
    color: var(--accent-color);
}

.feature-item h5 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.dark-mode .feature-item h5 {
    color: #e6c07b; /* Warm gold for headings in dark mode */
}

.light-mode .feature-item h5, .feature-item h5 {
    color: var(--primary-color);
}

.feature-list, .audience-list {
    list-style: none;
    padding-left: 0.5rem;
}

.feature-list li, .audience-list li {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: flex-start;
}

.dark-mode .feature-list, .dark-mode .audience-list {
    color: #f0e6d2; /* Warm cream color for lists in dark mode */
}

.dark-mode .list-icon {
    color: #e9b96e; /* Warm amber for list icons in dark mode */
}

.list-icon {
    display: inline-block;
    width: 1.5rem;
    margin-right: 0.75rem;
    text-align: center;
}

@media (max-width: 768px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

.search-results {
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: rgba(52, 152, 219, 0.1);
    border-radius: 4px;
}

.search-results mark {
    background-color: rgba(231, 76, 60, 0.3);
    padding: 0 2px;
}

#loading {
    text-align: center;
    padding: 2rem;
    font-size: 1.2rem;
    color: var(--secondary-color);
}

footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1rem;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

footer a {
    color: var(--accent-color);
    font-weight: bold;
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Quiz styling enhancements */
.quiz-topic {
    border-left: 6px solid var(--quiz-accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin: 2.5rem 0;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    animation: pulse-attention 3s infinite;
}

@keyframes pulse-attention {
    0% { box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); }
    50% { box-shadow: 0 4px 15px rgba(93, 156, 236, 0.3); }
    100% { box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); }
}

.quiz-topic:before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background-color: rgba(93, 156, 236, 0.1);
    border-radius: 50%;
    transform: translate(30%, -30%);
    z-index: 0;
}

.quiz-header {
    background-color: rgba(93, 156, 236, 0.2);
    padding: 1rem 1.5rem;
    border-radius: 5px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

/* Add "QUIZ" label to make it super obvious */
.quiz-header:after {
    content: 'QUIZ';
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--quiz-accent-color);
    color: white;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
    letter-spacing: 1px;
}

/* EMMI Logo styling */
.emmi-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    transition: transform 0.3s ease;
    background: rgba(255, 255, 255, 0.2);
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(231, 76, 60, 0.8), 0 0 25px rgba(231, 76, 60, 0.5);
    position: relative;
}

.emmi-logo:before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 8px;
    border: 2px solid #e74c3c;
    animation: pulse-border 2s infinite;
    z-index: -1;
}

@keyframes pulse-border {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.05); opacity: 1; }
    100% { transform: scale(1); opacity: 0.8; }
}

.emmi-logo img {
    height: 45px;
    width: auto;
    border-radius: 5px;
    filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.7));
}

.emmi-logo:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(231, 76, 60, 1), 0 0 30px rgba(231, 76, 60, 0.7);
}

@media (max-width: 992px) {
    .emmi-logo {
        margin: 0 auto;
    }
    
    .emmi-logo img {
        height: 40px;
    }
    
    /* Fix for duplicate headings */
    section h2:first-of-type {
        margin-top: 0.5rem;
    }
    
    /* Mobile auto-hide header/footer functionality */
    header, footer {
        transition: transform 0.3s ease-in-out;
    }
    
    /* By default, hide the header at the top and footer at the bottom */
    header {
        transform: translateY(-100%);
        z-index: 1060; /* Even higher z-index to ensure it stays above everything */
        background-color: var(--primary-color); /* Ensure header has background */
    }
    
    footer {
        transform: translateY(100%);
        z-index: 1050; /* Higher z-index to ensure it stays above content */
    }
    
    /* Class to show header/footer when needed */
    header.visible, footer.visible, body:has(.sidebar.open) header, .sidebar.open ~ header {
        transform: translateY(0);
    }
    
    /* JavaScript can add this class to body when sidebar is open */
    body.menu-open header {
        transform: translateY(0) !important;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        z-index: 1050; /* Ensure header stays above sidebar */
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); /* Add shadow for better visibility */
        background-color: var(--primary-color); /* Ensure header has background */
    }
    
    /* Make sure content area fills the screen in mobile view */
    .content {
        min-height: 100vh;
    }
    
    /* Container adjustments */
    .container {
        flex-direction: column;
        padding-top: 0; /* Remove top padding on mobile since header is hidden by default */
        padding-bottom: 0; /* Remove bottom padding on mobile since footer is hidden by default */
    }
    
    /* Mobile sidebar as overlay */
    .sidebar {
        width: 100%;
        max-height: 0;
        overflow: hidden;
        position: fixed; /* Changed to fixed positioning for overlay effect */
        top: 0;
        left: 0;
        height: auto; /* Changed from 100vh to auto */
        z-index: 1040; /* Lower than header/footer but higher than content */
        background-color: #f7f9fc; /* Solid color for mobile sidebar */
        transition: all 0.3s ease-in-out;
        visibility: hidden;
        opacity: 0;
        padding: 0; /* Reset padding */
        margin: 0; /* Reset margin */
    }
    
    .sidebar.open {
        max-height: 100vh; /* Changed from 140vh to 100vh to prevent unnecessary expansion */
        padding-top: 230px; /* Increased from 70px to provide more space for the header */
        padding-bottom: 160px; /* Increased padding bottom to avoid player overlap */
        visibility: visible;
        opacity: 0.98; /* Slightly transparent */
        overflow-y: auto; /* Allow scrolling */
        margin-top: 0; /* Reset margin */
        display: flex; /* Use flexbox for layout */
        flex-direction: column; /* Stack children vertically */
        -webkit-overflow-scrolling: touch; /* Smooth scrolling for iOS */
    }
    
    /* Dark mode mobile sidebar */
    .dark-mode .sidebar {
        background-color: #1e1e1e; /* Solid color for dark mode mobile sidebar */
    }
    
    /* High contrast mode mobile sidebar */
    .high-contrast-mode .sidebar {
        background-color: #ffffff; /* Solid color for high contrast mobile sidebar */
    }
    
    /* Dark high contrast mode mobile sidebar */
    .dark-mode.high-contrast-mode .sidebar {
        background-color: #000000; /* Solid color for dark high contrast mobile sidebar */
    }
    
    /* Position nav links below the header */
    .sidebar.open .nav-links {
        padding: 10px;
        margin-top: 10px; /* Adjusted to position just below sidebar's top padding */
        position: relative; /* Establish positioning context */
    }
    
    /* Target each individual menu item for extra insurance */
    .sidebar.open .nav-links li {
        margin-top: 5px;
        position: relative;
        opacity: 1; /* Ensure menu items are visible */
    }
    
    /* First menu item gets extra space */
    .sidebar.open .nav-links li:first-child {
        margin-top: 15px;
    }
    
    /* Apply spacing to all direct children of sidebar when open */
    @media (max-width: 992px) {
        .sidebar.open > * {
            margin-top: 60px; /* Add space between the header and all sidebar content */
            position: relative; /* Establish positioning context */
            opacity: 1; /* Ensure content is visible */
        }
        
        /* Force header to be visible and on top when sidebar is open */
        .sidebar.open + header,
        body:has(.sidebar.open) header {
            transform: translateY(0) !important;
            position: fixed !important;
            top: 0 !important;
            left: 0 !important;
            width: 100% !important;
            z-index: 1070 !important; /* Super high z-index */
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.2) !important;
        }
        
        /* Make sure the sidebar scrolls properly on mobile devices with audio player visible */
        .sidebar.open {
            height: 100vh; /* Set height to viewport height */
            max-height: 100vh; /* Maximum height is viewport height */
            overflow-y: auto !important; /* Force scrolling */
            -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
            padding-bottom: 160px; /* Add extra padding for the audio player */
        }
        
        /* Ensure content is visible when scrolling */
        .sidebar.open .nav-links {
            padding-bottom: 100px; /* Additional padding at the bottom of nav links */
        }
        
        /* Fix for hiding content behind audio player */
        .audio-player {
            position: fixed;
            z-index: 1050;
        }
        
        /* Ensure burger menu button is always accessible */
        .mobile-nav-toggle {
            z-index: 1080; /* Higher than both sidebar and audio player */
        }
    }
    
    header {
        padding: 0.8rem;
        flex-wrap: wrap;
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .header-controls {
        width: 100%;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 10px;
        justify-content: space-between;
    }
    
    .search-container {
        flex: 1;
        min-width: 200px;
    }
    
    .search-container input {
        width: 100%;
    }
    
    .theme-toggle {
        margin-right: 10px;
    }
    
    .theme-toggle span {
        font-size: 0.85rem;
    }
    
    .mobile-nav-toggle {
        display: flex; /* Ensure it's displayed as flex on mobile */
        position: fixed;
        bottom: 150px; /* Move higher up to avoid audio player overlap */
        right: 20px; /* Position on right side */
        z-index: 1060;
        background-color: var(--secondary-color);
        color: white;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        justify-content: center;
        align-items: center;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
        border: none;
        cursor: pointer;
        transform: translateY(0) !important;
        transition: background-color 0.3s ease, transform 0.3s ease;
    }

    .mobile-nav-toggle i {
        font-size: 1.5rem;
    }
    
    /* Adjustments for table display on mobile */
    table {
        display: block;
        width: 100%;
        overflow-x: auto;
    }
    
    /* Improved touch targets for mobile */
    .quiz-option, .topic-header, button {
        padding: 12px;
        min-height: 44px;
    }
    
    /* Better spacing for mobile reading */
    .topic-content {
        padding: 0 5px;
    }
    
    p, li, h3, h4 {
        margin-bottom: 1.2rem;
    }
    
    /* Ensure quiz content is visible on mobile */
    .quiz-topic.expanded .topic-content {
        max-height: none;
        overflow: visible;
        padding: 0 10px;
    }
    
    /* Improve spacing between quiz questions on mobile */
    .quiz-container {
        margin-bottom: 2rem;
    }
    
    /* Make quiz feedback more visible on mobile */
    .quiz-feedback {
        padding: 1rem;
        font-weight: bold;
        border-radius: 4px;
    }
    
    /* Fix the QUIZ label on mobile */
    .quiz-header:after {
        font-size: 0.65rem;
        padding: 2px 5px;
        right: 6px;
        letter-spacing: 0;
        white-space: nowrap; /* Prevent text wrapping */
        width: auto; /* Allow width to fit content */
        min-width: 30px; /* Set minimum width */
        text-align: center; /* Center the text */
        overflow: hidden; /* Prevent overflow */
        text-overflow: ellipsis; /* Add ellipsis for overflow text */
        max-width: 50px; /* Limit width on very small screens */
    }
    
    /* Adjust the quiz header padding on mobile */
    .quiz-header {
        padding: 0.8rem 1rem;
    }
    
    /* Make quiz header text smaller on mobile */
    .quiz-header h3 {
        font-size: 0.85rem;
        padding-right: 45px; /* Add more space for QUIZ label */
        line-height: 1.2; /* Tighten line height */
        overflow: hidden; /* Prevent overflow */
        text-overflow: ellipsis; /* Add ellipsis for overflow text */
        white-space: nowrap; /* Prevent text from wrapping */
        max-width: 100%; /* Ensure text doesn't overflow container */
    }
    
    /* Adjust icon size */
    .quiz-header h3:before {
        font-size: 1.1em;
        margin-right: 8px;
    }
    
    /* Fix quiz button label display on mobile */
    .quiz-header {
        display: flex;
        align-items: center;
        justify-content: flex-start; /* Align content to the left */
        flex-wrap: nowrap;
        position: relative; /* Ensure proper positioning context */
        min-height: 44px; /* Ensure minimum touch target size */
    }
}

/* Neurodivergent-friendly additional styles */
.key-concept {
    border-left: 4px solid var(--accent-color);
    padding-left: 15px;
    margin: 15px 0;
}

.visual-mnemonic {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03); /* Softer shadow */
}

.visual-mnemonic img {
    max-width: 100%;
    height: auto;
    margin-bottom: 10px;
}

.concept-map {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
    overflow: auto;
}

.progress-indicator-container {
    margin: 20px 0;
    background-color: var(--card-background);
    border-radius: 10px;
    overflow: hidden;
    height: 30px;
    position: relative;
    border: 1px solid var(--border-color);
}

.progress-indicator {
    position: absolute;
    height: 8px;
    background-color: var(--secondary-color);
    border-radius: 4px;
    width: 0%;
    z-index: 1;
    color: transparent; /* Hide any text content */
    overflow: hidden; /* Ensure no text is visible */
    text-indent: -9999px; /* Additional measure to hide text */
    font-size: 0; /* Eliminate any font rendering */
}

/* Accessibility Controls Panel */
.a11y-panel {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    margin: 20px auto;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 400px;
    width: auto;
    z-index: 1055; /* Higher than header/footer but below buttons */
    overflow: auto;
    max-height: 90vh;
    display: none; /* Hidden by default */
}

.a11y-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background-color: var(--secondary-color);
}

.a11y-section {
    margin-bottom: 25px;
    position: relative;
}

.a11y-section h3 {
    margin-bottom: 18px;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 10px;
    font-weight: 500;
    color: var(--subheading-color);
    display: flex;
    align-items: center;
    font-size: 1.1rem;
}

.a11y-section h3::before {
    font-family: 'Font Awesome 5 Free', FontAwesome;
    margin-right: 10px;
    font-weight: 900;
    font-size: 1.2rem;
}

.a11y-section:nth-child(1) h3::before {
    content: '\f042'; /* Adjust icon */
    color: var(--secondary-color);
}

.a11y-section:nth-child(2) h3::before {
    content: '\f02d'; /* Book icon */
    color: var(--secondary-color);
}

.a11y-section:nth-child(3) h3::before {
    content: '\f201'; /* Chart icon */
    color: var(--secondary-color);
}

.a11y-option {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.a11y-option:hover {
    background-color: rgba(52, 152, 219, 0.05);
}

.a11y-option input[type="checkbox"],
.a11y-option input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    margin-right: 10px;
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--card-background);
    flex-shrink: 0;
}

.a11y-option input[type="radio"] {
    border-radius: 50%;
}

.a11y-option input[type="checkbox"]:checked,
.a11y-option input[type="radio"]:checked {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.a11y-option input[type="checkbox"]:checked::after {
    content: '\2713';
    position: absolute;
    color: white;
    font-size: 14px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.a11y-option input[type="radio"]:checked::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: white;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.a11y-option label {
    margin-left: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    flex: 1;
}

/* Close button for accessibility panel */
.a11y-panel-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.a11y-panel-close:hover {
    color: var(--accent-color);
}

/* Size dropdown style adjustment */
.a11y-panel select {
    width: 100%;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--card-background);
    color: var(--text-color);
    font-size: 0.9rem;
}

/* Mobile adjustments for accessibility options */
@media (max-width: 992px) {
    .a11y-panel {
        width: 95%;
        padding: 20px;
        margin: 15px auto;
    }
    
    .a11y-option {
        padding: 12px 10px;
    }
    
    .a11y-option label {
        font-size: 1rem;
    }
    
    .a11y-option input[type="checkbox"],
    .a11y-option input[type="radio"] {
        width: 24px;
        height: 24px;
        margin-right: 12px;
    }
    
    .a11y-section h3 {
        font-size: 1.1rem;
        text-align: center;
        justify-content: center;
    }

    .a11y-option {
        margin-left: auto;
        margin-right: auto;
        max-width: 90%;
    }
}

/* Audio support for content */
.audio-support {
    display: inline-block;
    margin-left: 10px;
    color: var(--secondary-color);
    cursor: pointer;
}

.audio-support:hover {
    color: var(--accent-color);
}

/* Section summary boxes */
.section-summary {
    background-color: var(--card-background);
    border-left: 4px solid var(--secondary-color);
    padding: 15px;
    margin: 20px 0;
    border-radius: 0 8px 8px 0;
}

.section-summary h4 {
    color: var(--subheading-color);
    margin-bottom: 10px;
}

/* Keyboard shortcuts indicator */
.keyboard-shortcut {
    display: inline-block;
    background-color: var(--code-background);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    margin: 0 2px;
    border: 1px solid var(--border-color);
}

/* Tooltip for additional information */
.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted var(--secondary-color);
    cursor: help;
}

.tooltip .tooltip-text {
    visibility: hidden;
    background-color: var(--card-background);
    color: var(--text-color);
    text-align: center;
    border-radius: 6px;
    padding: 10px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    width: 200px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    opacity: 0;
    transition: opacity 0.3s;
    border: 1px solid var(--border-color);
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Pattern indicators for colorblind users */
.pattern-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-right: 5px;
    background-color: transparent;
    background-size: 10px 10px;
}

.pattern-primary {
    background-image: linear-gradient(45deg, var(--primary-color) 25%, transparent 25%, transparent 75%, var(--primary-color) 75%);
}

.pattern-secondary {
    background-image: linear-gradient(45deg, var(--secondary-color) 25%, transparent 25%, transparent 75%, var(--secondary-color) 75%);
}

.pattern-accent {
    background-image: linear-gradient(45deg, var(--accent-color) 25%, transparent 25%, transparent 75%, var(--accent-color) 75%);
}

.pattern-success {
    background-image: linear-gradient(45deg, var(--success-color) 25%, transparent 25%, transparent 75%, var(--success-color) 75%);
}

/* Progress indicator styling */
.progress-indicator-container {
    margin: 15px auto;
    background-color: var(--card-background);
    border-radius: 10px;
    overflow: hidden;
    height: 25px;
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    width: 100%;
}

.progress-indicator {
    position: absolute;
    height: 8px;
    background-color: var(--secondary-color);
    border-radius: 4px;
    width: 0%;
    z-index: 1;
    color: transparent; /* Hide any text content */
    overflow: hidden; /* Ensure no text is visible */
    text-indent: -9999px; /* Additional measure to hide text */
    font-size: 0; /* Eliminate any font rendering */
}

/* Mobile accessibility controls - Removed to fix footer visibility issue */

.a11y-toggle {
    display: block;
    position: fixed;
    bottom: 85px; /* Default position - will be adjusted by JS */
    right: 20px;
    z-index: 1060;
    background-color: var(--secondary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
    border: none;
    cursor: pointer;
    transform: translateY(0) !important;
    transition: background-color 0.2s ease, transform 0.2s ease, bottom 0.3s ease;
}

.a11y-toggle:hover, .a11y-toggle:focus {
    background-color: var(--accent-color);
    transform: scale(1.05);
    outline: none;
}

.a11y-toggle i {
    font-size: 1.7rem;
}

/* Mobile navigation toggle (burger menu) */
/* Hide by default on larger screens */
.mobile-nav-toggle {
    display: none; /* Changed from block/flex to none */
    position: fixed;
    bottom: 150px; /* Default position - will be adjusted by JS */
    right: 20px;
    z-index: 1060;
    background-color: var(--secondary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    justify-content: center; /* Kept flex properties for when it's displayed */
    align-items: center;    /* Kept flex properties for when it's displayed */
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    border: none;
    cursor: pointer;
    transform: translateY(0) !important; /* This !important might be problematic, but respecting original style for now */
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.mobile-nav-toggle:hover {
    background-color: var(--accent-color);
    transform: scale(1.05);
}

.mobile-nav-toggle i {
    font-size: 1.5rem;
}

@media (max-width: 992px) {
    /* ... other mobile styles ... */
    .mobile-nav-toggle, .a11y-toggle {
        right: 20px;
        transition: bottom 0.3s ease;
        display: flex; /* Show on mobile */
    }
    
    /* Ensure audio player has appropriate z-index */
    .audio-player {
        z-index: 1050;
    }
    
    /* Ensure the buttons are always clickable */
    .mobile-nav-toggle, .a11y-toggle {
        z-index: 1060;
    }
}

/* Audio player styles */
.audio-player {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    z-index: 1050;
    padding-top: 10px;
}

/* When collapsed, leave a small part visible for user to expand */
.audio-player.collapsed {
    transform: translateY(calc(100% - 18px));
    pointer-events: none;
}

/* Matrix background */
#matrixCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: var(--matrix-opacity); /* Use the custom opacity variable */
    pointer-events: none; /* Allow clicks to pass through */
    background-color: rgba(0, 0, 0, 0.95); /* Always dark background */
}

/* Maintain consistent matrix appearance across all themes */
.dark-mode #matrixCanvas,
.high-contrast-mode #matrixCanvas,
.dark-mode.high-contrast-mode #matrixCanvas,
.focus-mode #matrixCanvas,
.dark-mode.focus-mode #matrixCanvas {
    opacity: var(--matrix-opacity);
    background-color: rgba(0, 0, 0, 0.95); /* Always dark background */
}

/* Calm Mode hides the matrix animation */
.calm-mode #matrixCanvas,
.matrix-off #matrixCanvas {
    display: none !important;
}

/* Slider controls for Matrix settings */
.slider-control {
    width: 100%;
    margin: 5px 0;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--background-color);
    outline: none;
    border-radius: 4px;
    cursor: pointer;
}

.slider-control::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--secondary-color);
    cursor: pointer;
    transition: background 0.2s;
}

.slider-control::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--secondary-color);
    cursor: pointer;
    transition: background 0.2s;
    border: none;
}

.slider-control::-webkit-slider-thumb:hover,
.slider-control::-moz-range-thumb:hover {
    background: var(--accent-color);
}

.dark-mode .slider-control {
    background: #333;
}

.high-contrast-mode .slider-control::-webkit-slider-thumb,
.high-contrast-mode .slider-control::-moz-range-thumb {
    background: var(--focus-outline-color);
}

/* Ensure sliders have proper spacing in accessibility panel */
.a11y-option .slider-control {
    margin-top: 8px;
}

.quiz-header h3 {
    color: var(--quiz-accent-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    margin: 0;
    font-size: 1.2rem;
}

.quiz-header h3:before {
    content: '\f059';  /* Changed to a question mark icon that's more commonly available */
    font-family: 'Font Awesome 5 Free', FontAwesome;
    font-weight: 900;
    margin-right: 12px;
    font-size: 1.3em;
}

.quiz-topic.expanded .quiz-header {
    background-color: rgba(93, 156, 236, 0.3);
}

.quiz-topic.expanded {
    animation: none;
}

/* Improve quiz container styling */
.quiz-topic .quiz-container {
    background-color: rgba(93, 156, 236, 0.05);
    border-left: none;
    margin-bottom: 1.5rem;
}

.quiz-topic .quiz-button {
    background-color: var(--quiz-accent-color);
    transition: background-color 0.3s;
}

.quiz-topic .quiz-button:hover {
    background-color: #4a8bda;
}

/* Special handling for quiz topic content to ensure all questions are visible */
.quiz-topic.expanded .topic-content {
    max-height: none; /* Remove the max-height constraint completely for quiz sections */
    height: auto;
    overflow: visible; /* Ensure overflow is visible for quiz sections */
}

/* Video Resources Section */
.video-resources .topic-header h3 {
    position: relative;
    padding-left: 38px;
    display: flex;
    align-items: center;
    color: #e74c3c;
    font-weight: 600;
    margin: 0;
    font-size: 1.2rem;
}

.video-resources .topic-header h3:before {
    content: "📺";
    position: absolute;
    left: 0;
    font-size: 1.6rem;
}

.video-links {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1rem;
}

.video-link {
    background-color: var(--card-background);
    border-radius: 8px;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.video-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary-color);
    text-decoration: none;
    margin-bottom: 0.5rem;
}

.video-title i {
    color: #ff0000;
    font-size: 1.4rem;
}

.video-description {
    color: var(--text-color);
    font-size: 0.9rem;
    margin-left: 34px;
}

.animated-text {
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.animated-text:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

.video-title:hover .animated-text:after {
    width: 100%;
}

@media (max-width: 992px) {
    .video-links {
        gap: 1rem;
    }
    
    .video-link {
        padding: 0.8rem;
    }
    
    .video-title {
        font-size: 1rem;
    }
    
    .video-description {
        font-size: 0.85rem;
    }
}

/* Direct Video Links Styling */
.video-resources-title {
    color: #e74c3c;
    margin: 2rem 0 1rem;
    font-size: 1.4rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.direct-video-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}

.video-card {
    padding: 0;
    transition: transform 0.3s ease;
}

.video-card:hover {
    transform: translateY(-3px);
}

.video-link-direct {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 1.2rem;
    background-color: var(--card-background);
    border-radius: 8px;
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 1.2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

.video-link-direct:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
    background-color: rgba(52, 152, 219, 0.05);
}

.video-link-direct i {
    color: #ff0000;
    font-size: 1.8rem;
}

.video-link-text {
    position: relative;
    overflow: hidden;
}

.video-link-text:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

.video-link-direct:hover .video-link-text:after {
    width: 100%;
}

@media (max-width: 992px) {
    .video-resources-title {
        font-size: 1.3rem;
        margin: 1.5rem 0 0.8rem;
    }
    
    .video-link-direct {
        padding: 1rem;
        font-size: 1.1rem;
    }
    
    .video-link-direct i {
        font-size: 1.5rem;
    }
}

/* Reference links styling */
.reference-links {
    margin-top: 20px;
    padding: 10px 15px;
    background-color: rgba(52, 152, 219, 0.1);
    border-left: 3px solid var(--secondary-color);
    border-radius: 3px;
}

.reference-links a {
    color: #5a9178; /* Changed from blue to a more eye-friendly green */
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.reference-links a:hover {
    color: #3d6d59; /* Darker shade for hover state */
    text-decoration: underline;
}

.reference-links i {
    margin-right: 5px;
}

.dark-mode .reference-links {
    background-color: rgba(52, 152, 219, 0.15);
}

.high-contrast-mode .reference-links {
    background-color: #f0f0f0;
    border-left: 4px solid #0066ff;
}

.dark-mode.high-contrast-mode .reference-links {
    background-color: #222;
    border-left: 4px solid #66ccff;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    overflow: auto;
    transition: opacity 0.3s;
}

.modal[style*="display: block"] {
    display: block !important;
}

.modal-content {
    background-color: var(--card-background);
    color: var(--text-color);
    margin: 5% auto;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    width: 80%;
    max-width: 800px;
    position: relative;
    animation: modalFadeIn 0.3s;
}

@keyframes modalFadeIn {
    from {opacity: 0; transform: translateY(-20px);}
    to {opacity: 1; transform: translateY(0);}
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
    cursor: pointer;
    transition: color 0.2s;
    z-index: 2001;
}

.modal-close:hover {
    color: var(--accent-color);
}

.modal h3 {
    color: var(--heading-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.modal h4 {
    color: var(--subheading-color);
    margin: 15px 0 10px;
    font-size: 1.2rem;
}

.modal p, .modal ul {
    margin-bottom: 15px;
}

.modal pre {
    margin: 15px 0;
}

.modal-open {
    overflow: hidden;
}

/* High contrast mode adjustments */
.high-contrast-mode .modal {
    background-color: rgba(0, 0, 0, 0.9);
}

.high-contrast-mode .modal-content {
    border: 2px solid var(--border-color);
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 15px 20px;
    }
    
    .modal-close {
        top: 10px;
        right: 10px;
    }
}

/* Dark mode sidebar transparency */
.dark-mode .sidebar {
    background-color: #1e1e1e; /* Solid color for dark mode sidebar */
}

/* High contrast mode sidebar transparency */
.high-contrast-mode .sidebar {
    background-color: #ffffff; /* Solid color for high contrast mode */
}

/* Dark high contrast mode sidebar transparency */
.dark-mode.high-contrast-mode .sidebar {
    background-color: #000000; /* Solid color for dark high contrast mode */
}

/* Audio Player Styles */
.audio-player {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    z-index: 1050;
    padding-top: 10px; /* Increased padding to make room for the toggle button */
}

.audio-player-inner {
    display: flex;
    flex-direction: column;
    padding: 10px 20px;
    max-width: 1400px;
    margin: 0 auto;
}

.audio-player-title {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.audio-player-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.play-pause-btn {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.2s;
}

.play-pause-btn:hover {
    background-color: var(--accent-color);
}

.audio-player-progress {
    flex-grow: 1;
    position: relative;
    height: 8px;
}

.audio-player-progress input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    outline: none;
    border-radius: 4px;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
}

.audio-player-progress input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--secondary-color);
}

.audio-player-progress input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--secondary-color);
}

.progress-indicator {
    position: absolute;
    height: 8px;
    background-color: var(--secondary-color);
    border-radius: 4px;
    width: 0%;
    z-index: 1;
    color: transparent; /* Hide any text content */
    overflow: hidden; /* Ensure no text is visible */
    text-indent: -9999px; /* Additional measure to hide text */
    font-size: 0; /* Eliminate any font rendering */
}

.audio-player-time {
    min-width: 90px;
    font-size: 0.9rem;
    text-align: right;
}

/* Make player adjust to dark/light modes */
.dark-mode .audio-player {
    background-color: var(--primary-color);
}

/* High contrast mode */
.high-contrast-mode .audio-player {
    background-color: #000;
    color: #fff;
    border-top: 2px solid #fff;
}

.high-contrast-mode .audio-player-title {
    color: #66ccff;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Adjust for mobile devices */
@media (max-width: 992px) {
    .audio-player-inner {
        padding: 5px 5px;
    }
    
    .audio-player-controls {
        flex-wrap: wrap;
    }
    
    .audio-player-time {
        width: 100%;
        text-align: center;
        margin-top: 5px;
    }
    
    .audio-player-copyright {
        font-size: 0.75rem;
        padding: 4px 10px;
    }
    
    /* Give more space at the bottom of the container for the audio player */
    .container {
        padding-bottom: 150px; /* Increased padding to accommodate the player with copyright */
    }
    
    /* Adjust footer positioning to not overlap with player */
    footer {
        position: relative; /* Change from fixed to relative on mobile */
        z-index: 990; /* Lower than the audio player */
        margin-bottom: 100px; /* Increased space for the player with copyright */
    }
    
    /* Ensure audio player is fully visible */
    .audio-player {
        padding-bottom: env(safe-area-inset-bottom, 0); /* Support for iOS devices with home indicator */
        box-shadow: 0 -3px 10px rgba(0, 0, 0, 0.15); /* Stronger shadow for better visibility */
    }
    
    /* Make play button slightly larger on mobile for better touch target */
    .play-pause-btn {
        width: 44px;
        height: 44px;
    }
}

/* Buy Me a Coffee button styles */
.coffee-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0px auto 15px;
    padding: 1px 1px;
    background-color: #ffdd00;
    border-radius: 6px;
    transition: all 0.3s ease;
    text-decoration: none;
    max-width: 180px;
    width: 90%;
}

.coffee-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.coffee-btn img {
    width: 100%;
    height: auto;
}

.coffee-btn span {
    color: #000000;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Adjust for dark mode */
.dark-mode .coffee-btn {
    background-color: #ffdd00;
}

.dark-mode .coffee-btn span {
    color: #000000;
}

/* Adjust for high contrast mode */
.high-contrast-mode .coffee-btn {
    background-color: #ffff00;
    border: 2px solid #000000;
}

.dark-mode.high-contrast-mode .coffee-btn {
    background-color: #ffff00;
    border: 2px solid #ffffff;
}

/* Mobile styles */
@media (max-width: 992px) {
    .coffee-btn {
        margin: 0px auto;
        width: 85%;
        max-width: none;
    }
    
    .sidebar.open .coffee-btn {
        opacity: 1;
        transform: translateY(0);
        /* Additions for better fitting */
        width: auto;
        max-width: 160px;
        margin: 0px auto 0; /* Reduced top margin to decrease space */
        padding: 1px 1px; /* Minimal padding */
    }
    
    /* Also adjust the nav links bottom margin to remove extra space */
    .sidebar.open .nav-links {
        margin-bottom: 0;
        padding-bottom: 0;
    }
    
    /* Adjust the last nav item's margin to reduce space before coffee button */
    .sidebar.open .nav-links li:last-child {
        margin-bottom: 5px;
    }
}

.audio-player-copyright {
    text-align: center;
    font-size: 0.8rem;
    padding: 6px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 5px;
}

.audio-player-copyright a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.2s;
}

.audio-player-copyright a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* Dark mode styles for copyright */
.dark-mode .audio-player-copyright {
    border-top-color: rgba(255, 255, 255, 0.15);
}

/* High contrast mode styles for copyright */
.high-contrast-mode .audio-player-copyright {
    border-top-color: #fff;
}

.high-contrast-mode .audio-player-copyright a {
    color: #66ccff;
    text-decoration: underline;
}

/* Audio Player Toggle Button */
.audio-player-toggle {
    position: absolute;
    top: -34px;
    left: 12px;
    width: 34px;
    height: 34px;
    background-color: var(--secondary-color);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 0.8rem;
    cursor: pointer;
    z-index: 1060;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.9;
    padding: 0;
    transform: translateY(0);
}

/* When collapsed, position the player mostly off-screen but keep the button visible */
.audio-player.collapsed {
    transform: translateY(calc(100% - 18px));
    pointer-events: none;
    box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.1);
}

/* Ensure the button is always clickable and visible regardless of player state */
.audio-player-toggle {
    pointer-events: auto;
}

/* Button hover and focus states */
.audio-player-toggle:hover {
    background-color: var(--accent-color);
    transform: scale(1.1);
    opacity: 1;
}

.audio-player-toggle:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.4);
}

/* Icon rotation animation */
.audio-player-toggle i {
    transition: transform 0.3s ease;
}

.audio-player.collapsed .audio-player-toggle i {
    transform: rotate(180deg);
}

/* Collapsed player styles */
.audio-player.collapsed .audio-player-inner,
.audio-player.collapsed .audio-player-copyright {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

/* High contrast mode adjustments */
.high-contrast-mode .audio-player-toggle {
    background-color: #000;
    border: 2px solid #fff;
}

.dark-mode.high-contrast-mode .audio-player-toggle {
    background-color: #fff;
    color: #000;
    border: 2px solid #fff;
}

/* Animation for toggle button when player is collapsed */
@keyframes pulse-toggle {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.audio-player.collapsed .audio-player-toggle {
    animation: pulse-toggle 2s infinite;
    border: 1px solid rgba(255, 255, 255, 0.7);
    opacity: 1;
}

/* Mobile styles for audio player toggle */
@media (max-width: 992px) {
    .audio-player-toggle {
        top: -36px;
        width: 28px;
        height: 28px;
        font-size: 0.9rem;
        box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.2);
    }
    
    .audio-player {
        padding-top: 14px; /* More space for the larger button */
    }
    
    .audio-player.collapsed {
        transform: translateY(calc(100% - 14px));
        background-color: var(--primary-color);
    }
    
    /* Adapt floating buttons position */
    .mobile-nav-toggle, 
    .a11y-toggle {
        transition: bottom 0.3s ease-out;
    }
}

/* Menu auto-hide progress indicator */
.menu-auto-hide-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 4px;
    background-color: var(--accent-color);
    width: 100%;
    transition: width 0.1s linear;
    z-index: 1100;
}

/* In dark mode, make it more visible */
.dark-mode .menu-auto-hide-progress {
    background-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.3);
}

/* High contrast version */
.high-contrast-mode .menu-auto-hide-progress {
    background-color: #ffff00;
    height: 6px;
}

/* Audio player auto-hide progress indicator */
.audio-auto-hide-progress {
    position: absolute;
    top: 0;
    left: 0;
    height: 3px;
    background-color: var(--accent-color);
    width: 100%;
    transition: width 0.1s linear;
    z-index: 1100;
}

/* In dark mode, make it more visible */
.dark-mode .audio-auto-hide-progress {
    background-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.3);
}

/* High contrast version */
.high-contrast-mode .audio-auto-hide-progress {
    background-color: #ffff00;
    height: 5px;
}

/* Additional styles for focus state on audio player controls */
.audio-player-controls button:focus,
.audio-player-controls input:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* Ensure the auto-hide indicator doesn't appear when audio is playing */
.audio-player:has(audio:not([paused])) .audio-auto-hide-progress {
    display: none;
}

.dark-mode.high-contrast-mode .a11y-toggle {
    background-color: #fff;
    color: #000;
    border: 2px solid #fff;
} 

/* =============================================== */
/* LINUX TUTOR CHAT STYLES                         */
/* =============================================== */

/* Chat toggle button */
.linux-chat-toggle {
    display: block;
    position: fixed;
    bottom: 150px; /* Position above a11y-toggle */
    right: 20px;
    z-index: 1060;
    background-color: var(--secondary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
    border: none;
    cursor: pointer;
    transform: translateY(0) !important;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.linux-chat-toggle:hover, 
.linux-chat-toggle:focus {
    background-color: var(--accent-color);
    transform: scale(1.05);
    outline: none;
}

.linux-chat-toggle i {
    font-size: 1.7rem;
}

/* Chat panel styles */
.linux-chat-panel {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    margin: 20px auto;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    position: fixed;
    top: 50%;
    right: -400px; /* Hidden by default */
    transform: translateY(-50%);
    width: 350px;
    max-width: 90vw;
    height: 500px;
    max-height: 80vh;
    z-index: 1055;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: right 0.3s ease-in-out;
}

.linux-chat-panel.open {
    right: 20px;
}

.linux-chat-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background-color: var(--secondary-color);
}

.chat-panel-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.chat-panel-close:hover {
    color: var(--accent-color);
}

.chat-header {
    padding-bottom: 15px;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.chat-header h3 {
    margin: 0;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--subheading-color);
}

.chat-header h3 i {
    color: var(--accent-color);
}

/* Chat messages area */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 10px 0;
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 100%;
}

.chat-message {
    display: flex;
    flex-direction: column;
    max-width: 80%;
}

.user-message {
    align-self: flex-end;
}

.ai-message {
    align-self: flex-start;
}

.message-content {
    padding: 12px;
    border-radius: 15px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.user-message .message-content {
    background-color: var(--secondary-color);
    color: white;
    border-radius: 15px 15px 0 15px;
}

.ai-message .message-content {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 15px 15px 15px 0;
    max-width: 120%;
    width: 120%;
}

/* Specific styling for pre elements in chat messages */
.message-content pre,
.ai-message pre,
.linux-chat-panel pre {
    white-space: pre-wrap !important;
    word-wrap: break-word !important;
    word-break: break-word !important;
    max-width: 100% !important;
    overflow-x: auto !important;
    font-size: 0.9em;
}

/* Chat input area */
.chat-input-container {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border-top: 1px solid var(--border-color);
    margin-top: 10px;
}

#chatInput {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background-color: var(--card-background);
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 14px;
}

#chatInput:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.attachment-btn,
.send-btn {
    background: none;
    border: none;
    color: var(--secondary-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.attachment-btn:hover,
.send-btn:hover {
    color: var(--accent-color);
}

/* File preview area */
.file-preview {
    background-color: rgba(52, 152, 219, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

.remove-file {
    background: none;
    border: none;
    color: var(--accent-color);
    cursor: pointer;
    padding: 2px 5px;
    font-size: 0.9rem;
}

.remove-file:hover {
    color: var(--text-color);
}

/* Dark mode adjustments */
.dark-mode .linux-chat-panel {
    background-color: var(--card-background);
    border-color: var(--border-color);
}

.dark-mode .message-content {
    background-color: var(--card-background);
}

.dark-mode .ai-message .message-content {
    border-color: var(--border-color);
}

/* High contrast mode adjustments */
.high-contrast-mode .linux-chat-toggle {
    background-color: #000;
    color: #fff;
    border: 2px solid #000;
}

.dark-mode.high-contrast-mode .linux-chat-toggle {
    background-color: #fff;
    color: #000;
    border: 2px solid #fff;
}

.high-contrast-mode .linux-chat-panel {
    border: 2px solid #000;
}

.dark-mode.high-contrast-mode .linux-chat-panel {
    border: 2px solid #fff;
}

.high-contrast-mode .user-message .message-content {
    background-color: #000;
    color: #fff;
}

.dark-mode.high-contrast-mode .user-message .message-content {
    background-color: #fff;
    color: #000;
}

/* Dark mode specific quiz styling */
.dark-mode .quiz-option {
    background-color: #2a2a2a;
    color: #e0e0e0;
    border-color: #555;
}

.dark-mode .quiz-option:hover {
    background-color: #3a3a3a;
    border-color: var(--secondary-color);
}

.dark-mode .quiz-option.selected {
    background-color: rgba(46, 204, 113, 0.3);
    color: #fff;
    border-color: var(--success-color);
}

.dark-mode .quiz-option.wrong {
    background-color: rgba(114, 194, 233, 0.3);
    color: #fff;
    border-color: var(--quiz-accent-color);
}

/* Intro Video Modal Styles */
.intro-video-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.intro-video-modal.visible {
    opacity: 1;
    visibility: visible;
}

.intro-video-content {
    position: relative;
    width: 65%;
    height: 0;
    padding-bottom: 36.5625%; /* 16:9 aspect ratio (65% * 9/16) */
    background-color: #000;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.intro-video-iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

.intro-video-close {
    position: absolute;
    top: -40px;
    right: -40px;
    width: 36px;
    height: 36px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 10001;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.intro-video-close:hover {
    background-color: var(--secondary-color);
    transform: scale(1.1);
}

.intro-video-close:focus {
    outline: 3px solid var(--focus-outline-color);
}

.intro-video-unmute {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 10001;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.intro-video-unmute:hover {
    background-color: var(--secondary-color);
    transform: scale(1.1);
}

.intro-video-unmute:focus {
    outline: 3px solid var(--focus-outline-color);
}

/* Responsive styles for intro video modal */
@media (max-width: 992px) {
    .intro-video-content {
        width: 85%;
        padding-bottom: 47.8125%; /* 16:9 aspect ratio (85% * 9/16) */
    }
    
    .intro-video-close {
        top: -35px;
        right: 0;
    }
}

@media (max-width: 576px) {
    .intro-video-content {
        width: 95%;
        padding-bottom: 53.4375%; /* 16:9 aspect ratio (95% * 9/16) */
    }
}

/* Mobile responsiveness for chat */
@media (max-width: 992px) {
    .linux-chat-toggle {
        z-index: 1060;
        position: fixed;
        right: 20px;
        transform: translateY(0) !important;
        /* Remove fixed top positioning to allow dynamic bottom positioning from JavaScript */
        /* We'll handle position through the JavaScript adjustLayout function */
    }
    
    .linux-chat-panel {
        width: 85vw;
        height: 70vh;
        right: -100vw;
    }
    
    .linux-chat-panel.open {
        right: 7.5vw;
    }
}

/* Add styling for resource links */
.resource-link {
    color: #5a9178; /* Match the new color used for reference links */
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    margin-top: 5px;
    transition: color 0.2s;
}

.resource-link:hover {
    color: #3d6d59; /* Darker shade for hover state */
    text-decoration: underline;
}

/* Resources Dropdown Styles */
.resources-dropdown {
    margin-top: 1rem;
}

.resources-dropdown .dropdown-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    padding: 0.5rem 0;
}

.resources-dropdown .dropdown-header i {
    transition: transform 0.3s ease;
}

.resources-dropdown .dropdown-header.active i {
    transform: rotate(180deg);
}

.resources-container {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.resources-container.active {
    max-height: 2000px; /* Adjust this value based on content height */
    transition: max-height 0.5s ease-in;
}