/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8fafc;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Vocabulary Highlighting */
.vocab-highlight {
    background-color: #fef3c7;
    padding: 2px 4px;
    border-radius: 3px;
    font-weight: 500;
    color: #92400e;
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-logo i {
    margin-right: 10px;
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-menu li {
    margin-left: 2rem;
    position: relative;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
}

.nav-link:hover {
    color: #fbbf24;
}

.nav-link i {
    margin-left: 5px;
    font-size: 0.8rem;
}

/* Dropdown */
.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 250px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    border-radius: 8px;
    padding: 10px 0;
    z-index: 1001;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    color: #333;
    padding: 10px 20px;
    text-decoration: none;
    display: block;
    transition: background-color 0.3s ease;
}

.dropdown-content a:hover {
    background-color: #f3f4f6;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* Main Content */
main {
    margin-top: 80px;
}

.section {
    display: none;
    min-height: calc(100vh - 80px);
    padding: 2rem 0;
}

.section.active {
    display: block;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: #f59e0b;
    color: white;
}

.btn-primary:hover {
    background: #d97706;
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255,255,255,0.2);
    color: white;
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

.btn-back {
    background: #6b7280;
    color: white;
    margin-bottom: 2rem;
}

.btn-back:hover {
    background: #4b5563;
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.2rem;
}

/* Features Section */
.features {
    padding: 4rem 0;
    text-align: center;
}

.features h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1f2937;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card i {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #1f2937;
}

/* Stats Section */
.stats-section {
    padding: 4rem 0;
    background: white;
    text-align: center;
}

.stats-section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #1f2937;
}

.stats-intro {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 3rem;
    color: #4b5563;
}

.chart-container {
    max-width: 600px;
    margin: 0 auto;
}

.chart-container h3 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: #1f2937;
}

.chart {
    display: flex;
    justify-content: space-around;
    align-items: end;
    height: 300px;
    background: #f9fafb;
    border-radius: 12px;
    padding: 2rem;
}

.chart-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 80px;
}

.bar {
    width: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px 4px 0 0;
    position: relative;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    color: white;
    font-weight: bold;
}

.bar:hover {
    transform: scale(1.05);
}

.bar-value {
    padding: 5px;
    font-size: 0.9rem;
}

.bar-label {
    margin-top: 10px;
    font-size: 0.8rem;
    text-align: center;
    color: #4b5563;
    font-weight: 500;
}

/* Modules Section */
.modules-section {
    padding: 4rem 0;
}

.modules-section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: #1f2937;
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.module-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    border-left: 4px solid #667eea;
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.module-number {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-bottom: 1rem;
}

.module-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #1f2937;
}

.module-card p {
    color: #6b7280;
    margin-bottom: 1rem;
}

.module-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: #9ca3af;
}

.module-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Resources Section */
.resources-section {
    padding: 4rem 0;
    background: white;
}

.resources-section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: #1f2937;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.resource-card {
    background: #f9fafb;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.resource-card:hover {
    background: white;
    border-color: #667eea;
    transform: translateY(-3px);
}

.resource-card i {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.resource-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #1f2937;
}

/* Module Pages */
.module-header {
    margin-bottom: 3rem;
}

.module-title {
    text-align: center;
    margin-top: 2rem;
}

.module-badge {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.module-title h1 {
    font-size: 2.5rem;
    margin: 1rem 0;
    color: #1f2937;
}

.module-subtitle {
    font-size: 1.2rem;
    color: #6b7280;
}

.module-content {
    max-width: 800px;
    margin: 0 auto;
}

.learning-objectives {
    background: #eff6ff;
    border-left: 4px solid #3b82f6;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 3rem;
}

.learning-objectives h3 {
    color: #1e40af;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.learning-objectives ul {
    list-style: none;
    padding-left: 0;
}

.learning-objectives li {
    padding: 8px 0;
    position: relative;
    padding-left: 25px;
}

.learning-objectives li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

.content-section {
    margin-bottom: 3rem;
}

.content-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #1f2937;
}

.content-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: #4b5563;
}

.content-section ul {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.content-section li {
    margin-bottom: 0.5rem;
    color: #4b5563;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline:before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #667eea;
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 2rem;
}

.timeline-item:before {
    content: '';
    position: absolute;
    left: -8px;
    top: 5px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #667eea;
}

.timeline-year {
    font-weight: bold;
    color: #667eea;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: #6b7280;
}

/* AI Types Grid */
.ai-types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.ai-type-card {
    background: #f9fafb;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.ai-type-card h4 {
    color: #1f2937;
    margin-bottom: 1rem;
}

.ai-type-card p {
    color: #6b7280;
    font-size: 0.9rem;
}

/* Module Navigation */
.module-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #e5e7eb;
}

/* Coming Soon */
.coming-soon {
    text-align: center;
    padding: 4rem 2rem;
    background: #f9fafb;
    border-radius: 12px;
    margin-bottom: 3rem;
}

.coming-soon i {
    font-size: 4rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.coming-soon h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #1f2937;
}

.coming-soon p {
    color: #6b7280;
    max-width: 500px;
    margin: 0 auto;
}

/* Quiz Styles */
.quiz-header, .section-header {
    margin-bottom: 3rem;
}

.quiz-title, .section-title {
    text-align: center;
    margin-top: 2rem;
}

.quiz-title i, .section-title i {
    font-size: 3rem;
    color: #f59e0b;
    margin-bottom: 1rem;
    display: block;
}

.quiz-title h1, .section-title h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1f2937;
}

.quiz-title p, .section-title p {
    font-size: 1.2rem;
    color: #6b7280;
}

.quiz-start {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    padding: 3rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.quiz-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: #f59e0b;
}

.stat-label {
    color: #6b7280;
    font-size: 0.9rem;
}

.quiz-instructions {
    margin-bottom: 3rem;
}

.quiz-instructions h3 {
    color: #1f2937;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.quiz-instructions ol {
    padding-left: 2rem;
    margin-bottom: 2rem;
}

.quiz-instructions li {
    margin-bottom: 0.5rem;
    color: #4b5563;
}

.scoring-guide {
    background: #eff6ff;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #3b82f6;
}

.scoring-guide h4 {
    color: #1e40af;
    margin-bottom: 1rem;
}

.scoring-guide ul {
    list-style: none;
    padding-left: 0;
}

.scoring-guide li {
    padding: 5px 0;
    color: #1e40af;
}

/* Quiz Content */
.quiz-content {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-progress {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: #e5e7eb;
    border-radius: 4px;
    margin-right: 1rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-text {
    font-weight: 600;
    color: #1f2937;
    white-space: nowrap;
}

.question-container {
    background: white;
    padding: 3rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.question-number {
    font-size: 1.2rem;
    font-weight: bold;
    color: #667eea;
}

.question-module {
    background: #eff6ff;
    color: #1e40af;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.question-text {
    font-size: 1.3rem;
    color: #1f2937;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.answer-options {
    display: grid;
    gap: 1rem;
}

.answer-option {
    background: #f9fafb;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.answer-option:hover {
    background: #eff6ff;
    border-color: #3b82f6;
}

.answer-option.selected {
    background: #dbeafe;
    border-color: #3b82f6;
}

.answer-option.correct {
    background: #d1fae5;
    border-color: #10b981;
}

.answer-option.incorrect {
    background: #fee2e2;
    border-color: #ef4444;
}

.option-letter {
    background: #667eea;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.option-text {
    flex: 1;
    color: #1f2937;
}

.quiz-navigation {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.answered-count {
    color: #6b7280;
    font-weight: 500;
}

/* Assignments */
.assignments-grid {
    display: grid;
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.assignment-card {
    background: white;
    border-radius: 12px;
    padding: 3rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-left: 4px solid #f59e0b;
}

.assignment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.assignment-number {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
}

.assignment-points {
    background: #eff6ff;
    color: #1e40af;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
}

.assignment-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #1f2937;
}

.assignment-description {
    font-size: 1.1rem;
    color: #4b5563;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.assignment-details h4 {
    color: #1f2937;
    margin: 2rem 0 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.assignment-details ul {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.assignment-details li {
    margin-bottom: 0.5rem;
    color: #4b5563;
}

.rubric {
    background: #f9fafb;
    border-radius: 8px;
    padding: 1.5rem;
}

.rubric-item {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid #e5e7eb;
}

.rubric-item:last-child {
    border-bottom: none;
}

.rubric-criteria {
    font-weight: 600;
    color: #1f2937;
}

.rubric-description {
    color: #6b7280;
    text-align: right;
    max-width: 60%;
}

.assignment-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

/* Discussions */
.discussions-grid {
    display: grid;
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.discussion-card {
    background: white;
    border-radius: 12px;
    padding: 3rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-left: 4px solid #10b981;
}

.discussion-header {
    margin-bottom: 2rem;
}

.discussion-header h3 {
    font-size: 1.8rem;
    color: #1f2937;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.discussion-meta {
    display: flex;
    gap: 2rem;
    color: #6b7280;
    font-size: 0.9rem;
}

.discussion-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.discussion-prompt {
    font-size: 1.1rem;
    color: #4b5563;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.discussion-questions {
    margin-bottom: 2rem;
    padding-left: 2rem;
}

.discussion-questions li {
    margin-bottom: 0.5rem;
    color: #4b5563;
}

.discussion-guidelines {
    background: #f0fdf4;
    border-left: 4px solid #10b981;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.discussion-guidelines h4 {
    color: #065f46;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.discussion-guidelines ul {
    padding-left: 2rem;
}

.discussion-guidelines li {
    margin-bottom: 0.5rem;
    color: #065f46;
}

.discussion-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.recent-posts {
    border-top: 1px solid #e5e7eb;
    padding-top: 2rem;
}

.recent-posts h4 {
    color: #1f2937;
    margin-bottom: 1rem;
}

.post-preview {
    background: #f9fafb;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.post-author {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: #6b7280;
}

.post-author i {
    color: #9ca3af;
}

.post-time {
    margin-left: auto;
}

.post-excerpt {
    color: #4b5563;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Vocabulary */
.vocabulary-search {
    margin-bottom: 3rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.search-box {
    position: relative;
}

.search-box i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
}

.search-box input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 2px solid #e5e7eb;
    border-radius: 25px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: #667eea;
}

.vocabulary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.vocab-term {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    border-left: 4px solid #fbbf24;
}

.vocab-term:hover {
    transform: translateY(-3px);
}

.vocab-term-number {
    background: #fbbf24;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.vocab-term-name {
    font-size: 1.3rem;
    font-weight: bold;
    color: #1f2937;
    margin-bottom: 1rem;
    background-color: #fef3c7;
    padding: 4px 8px;
    border-radius: 4px;
    display: inline-block;
}

.vocab-term-definition {
    color: #4b5563;
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 80px;
        flex-direction: column;
        background-color: rgba(102, 126, 234, 0.95);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        backdrop-filter: blur(10px);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 1rem 0;
    }
    
    .dropdown-content {
        position: static;
        display: block;
        background: rgba(255,255,255,0.1);
        box-shadow: none;
        border-radius: 0;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features-grid,
    .modules-grid,
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    .chart {
        flex-direction: column;
        height: auto;
        gap: 1rem;
    }
    
    .chart-bar {
        width: 100%;
        height: 40px;
    }
    
    .bar {
        width: 100%;
        height: 100%;
        flex-direction: row;
        border-radius: 4px;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .quiz-navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .assignment-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .assignment-actions,
    .discussion-actions {
        flex-direction: column;
    }
    
    .discussion-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .rubric-item {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .rubric-description {
        text-align: left;
        max-width: 100%;
    }
    
    .module-navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .features h2,
    .stats-section h2,
    .modules-section h2,
    .resources-section h2 {
        font-size: 2rem;
    }
    
    .module-title h1,
    .quiz-title h1,
    .section-title h1 {
        font-size: 2rem;
    }
    
    .quiz-start,
    .assignment-card,
    .discussion-card {
        padding: 2rem 1.5rem;
    }
    
    .question-container {
        padding: 2rem 1.5rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-50px); }
    to { opacity: 1; transform: translateX(0); }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.hidden { display: none; }
.visible { display: block; }