/* ================================================
   BAC TERMINALE - STYLES PROFESSIONNELS
   Design moderne et responsive pour la préparation au BAC
   ================================================ */

/* ===== VARIABLES & RESET ===== */
:root {
    /* Couleurs principales */
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #f59e0b;
    
    /* Couleurs par matière */
    --math-color: #3b82f6;
    --physics-color: #8b5cf6;
    --svt-color: #10b981;
    --french-color: #ec4899;
    --philosophy-color: #f59e0b;
    --quiz-color: #ef4444;
    
    /* Couleurs de fond */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;
    --bg-card: #ffffff;
    
    /* Couleurs de texte */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-white: #ffffff;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Bordures */
    --border-radius: 12px;
    --border-color: #e2e8f0;
    
    /* Espacements */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.nav-link:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
}

.nav-link.quiz-link.active {
    background: linear-gradient(135deg, #ef4444, #f59e0b);
}

.nav-link i {
    font-size: 1.1rem;
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    padding: var(--spacing-xs);
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

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

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.stat-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-card i {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin: var(--spacing-xs) 0;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ===== SUBJECT HERO ===== */
.subject-hero {
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--text-white);
    position: relative;
    overflow: hidden;
}

.subject-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.1;
    background-image: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.3) 0%, transparent 50%),
                      radial-gradient(circle at 80% 80%, rgba(255,255,255,0.3) 0%, transparent 50%);
}

.math-gradient {
    background: linear-gradient(135deg, #3b82f6, #2563eb, #1d4ed8);
}

.physics-gradient {
    background: linear-gradient(135deg, #a855f7, #8b5cf6, #7c3aed);
}

.svt-gradient {
    background: linear-gradient(135deg, #34d399, #10b981, #059669);
}

.french-gradient {
    background: linear-gradient(135deg, #f472b6, #ec4899, #db2777);
}

.philosophy-gradient {
    background: linear-gradient(135deg, #fbbf24, #f59e0b, #d97706);
}

.quiz-gradient {
    background: linear-gradient(135deg, #f87171, #ef4444, #dc2626);
}

.subject-hero-content {
    position: relative;
    z-index: 1;
}

.subject-hero-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.subject-hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.subject-hero-subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
}

/* ===== SECTIONS ===== */
.subjects-section,
.programme-section,
.courses-section,
.resources-section,
.quick-nav-section,
.features-section,
.quiz-tabs-section,
.quiz-content-section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-title i {
    color: var(--primary-color);
    margin-right: var(--spacing-xs);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== SUBJECT CARDS ===== */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.subject-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.subject-card:hover::before {
    transform: scaleX(1);
}

.subject-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.subject-card.math:hover {
    border-color: var(--math-color);
}

.subject-card.physics:hover {
    border-color: var(--physics-color);
}

.subject-card.svt:hover {
    border-color: var(--svt-color);
}

.subject-card.french:hover {
    border-color: var(--french-color);
}

.subject-card.philosophy:hover {
    border-color: var(--philosophy-color);
}

.subject-card.quiz:hover {
    border-color: var(--quiz-color);
}

.subject-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
}

.subject-card.math .subject-icon {
    background: linear-gradient(135deg, var(--math-color), #2563eb);
}

.subject-card.physics .subject-icon {
    background: linear-gradient(135deg, var(--physics-color), #7c3aed);
}

.subject-card.svt .subject-icon {
    background: linear-gradient(135deg, var(--svt-color), #059669);
}

.subject-card.french .subject-icon {
    background: linear-gradient(135deg, var(--french-color), #db2777);
}

.subject-card.philosophy .subject-icon {
    background: linear-gradient(135deg, var(--philosophy-color), #d97706);
}

.subject-card.quiz .subject-icon {
    background: linear-gradient(135deg, var(--quiz-color), #dc2626);
}

.subject-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.subject-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.subject-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.subject-lessons {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.subject-arrow {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* ===== PROGRAMME CARDS ===== */
.programme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.programme-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.programme-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.programme-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
}

.programme-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.programme-card ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.programme-card ul li {
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.programme-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.5rem;
}

/* ===== CONTENT PLACEHOLDER ===== */
.content-placeholder {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 2px dashed var(--border-color);
    margin: var(--spacing-xl) 0;
}

.placeholder-icon {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.content-placeholder h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.content-placeholder p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.placeholder-note {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-style: italic;
}

/* ===== LESSONS ===== */
.lessons-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.lesson-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
}

.lesson-card:hover {
    box-shadow: var(--shadow-lg);
}

.lesson-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.lesson-header:hover {
    background: #e2e8f0;
}

.lesson-number {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.9rem;
}

.lesson-title {
    flex: 1;
    margin: 0 var(--spacing-md);
    font-size: 1.3rem;
    font-weight: 700;
}

.lesson-toggle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.lesson-toggle:hover {
    color: var(--primary-color);
}

.lesson-content {
    display: none;
    padding: var(--spacing-lg);
}

.lesson-content.active {
    display: block;
}

.lesson-body h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.lesson-body h4 i {
    color: var(--primary-color);
}

.course-content {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.exercises-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.exercise-item {
    background: var(--bg-secondary);
    border-radius: 8px;
    overflow: hidden;
}

.exercise-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: var(--transition);
}

.exercise-header:hover {
    background: #e2e8f0;
}

.exercise-number {
    font-weight: 600;
    color: var(--primary-color);
}

.exercise-toggle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.exercise-content {
    display: none;
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.exercise-content.active {
    display: block;
}

.exercise-question {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.exercise-solution {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

/* ===== RESOURCES ===== */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.resource-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.resource-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.resource-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.resource-card p {
    color: var(--text-secondary);
}

/* ===== FEATURES ===== */
.features-section {
    background: var(--bg-card);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 2.5rem;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
}

/* ===== QUIZ TABS ===== */
.quiz-tabs-section {
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 73px;
    z-index: 100;
}

.quiz-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
}

.quiz-tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    transition: var(--transition);
}

.quiz-tab:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.quiz-tab.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
}

.quiz-tab i {
    font-size: 1.2rem;
}

.quiz-content-section {
    display: none;
}

.quiz-content-section.active {
    display: block;
}

/* ===== SUBJECT FILTER ===== */
.subject-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.filter-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 50px;
    border: 2px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-weight: 600;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-btn.active {
    background: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
}

/* ===== QUIZ GRID ===== */
.quiz-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.quiz-category {
    margin-bottom: var(--spacing-lg);
}

.category-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-primary);
}

.category-title i {
    color: var(--accent-color);
}

.quiz-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.quiz-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.quiz-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.quiz-card.challenge {
    border: 2px solid var(--accent-color);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05), rgba(239, 68, 68, 0.05));
}

.quiz-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
}

.quiz-card-header.math {
    background: rgba(59, 130, 246, 0.1);
    color: var(--math-color);
}

.quiz-card-header.physics {
    background: rgba(139, 92, 246, 0.1);
    color: var(--physics-color);
}

.quiz-card-header.svt {
    background: rgba(16, 185, 129, 0.1);
    color: var(--svt-color);
}

.quiz-card-header.french {
    background: rgba(236, 72, 153, 0.1);
    color: var(--french-color);
}

.quiz-card-header.philosophy {
    background: rgba(245, 158, 11, 0.1);
    color: var(--philosophy-color);
}

.quiz-card-header.challenge-header {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(239, 68, 68, 0.2));
    color: var(--accent-color);
}

.quiz-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.quiz-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.quiz-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.quiz-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.quiz-btn {
    width: 100%;
    padding: var(--spacing-sm);
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
    font-weight: 600;
    transition: var(--transition);
}

.quiz-btn:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* ===== EXAMS ===== */
.exams-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.exam-subject-section {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.exam-subject-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.exam-subject-header.math {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(37, 99, 235, 0.1));
    color: var(--math-color);
}

.exam-subject-header.physics {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(139, 92, 246, 0.1));
    color: var(--physics-color);
}

.exam-subject-header.svt {
    background: linear-gradient(135deg, rgba(52, 211, 153, 0.1), rgba(16, 185, 129, 0.1));
    color: var(--svt-color);
}

.exam-subject-header.french {
    background: linear-gradient(135deg, rgba(244, 114, 182, 0.1), rgba(236, 72, 153, 0.1));
    color: var(--french-color);
}

.exam-subject-header.philosophy {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(245, 158, 11, 0.1));
    color: var(--philosophy-color);
}

.exam-subject-header i {
    font-size: 2rem;
}

.exam-subject-header h3 {
    font-size: 1.8rem;
    font-weight: 700;
}

.exam-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.exam-card {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: var(--spacing-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.exam-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-3px);
}

.exam-number {
    display: inline-block;
    background: var(--primary-color);
    color: var(--text-white);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.exam-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.exam-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.exam-info {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.exam-info span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.exam-btn {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 6px;
    background: var(--primary-color);
    color: var(--text-white);
    font-weight: 600;
    transition: var(--transition);
}

.exam-btn:hover {
    background: var(--secondary-color);
}

/* ===== PREPARATION ===== */
.preparation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.preparation-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
}

.preparation-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.preparation-card.premium {
    border: 2px solid var(--accent-color);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05), rgba(239, 68, 68, 0.05));
}

.prep-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--accent-color);
    color: var(--text-white);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.prep-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
}

.preparation-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.prep-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.prep-features {
    margin-bottom: var(--spacing-lg);
}

.prep-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

.prep-features li i {
    color: var(--primary-color);
}

.prep-btn {
    width: 100%;
    padding: var(--spacing-sm);
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
    font-weight: 600;
    transition: var(--transition);
}

.prep-btn:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* ===== QUICK NAVIGATION ===== */
.quick-nav-section {
    background: var(--bg-card);
    text-align: center;
}

.quick-nav-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.quick-nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.quick-nav-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition);
    border: 2px solid transparent;
}

.quick-nav-card:hover {
    background: var(--primary-color);
    color: var(--text-white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.quick-nav-card i {
    font-size: 1.5rem;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.footer-section h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.3rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--text-white);
    padding-left: var(--spacing-xs);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .subject-hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 73px;
        left: -100%;
        width: 280px;
        height: calc(100vh - 73px);
        background: var(--bg-card);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-xl);
        transition: var(--transition);
        overflow-y: auto;
    }
    
    .nav.active {
        left: 0;
    }
    
    .nav-link {
        width: 100%;
        justify-content: flex-start;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .subject-hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .subjects-grid,
    .quiz-cards-grid,
    .exam-cards,
    .preparation-grid {
        grid-template-columns: 1fr;
    }
    
    .quiz-tabs {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .quiz-tab {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 2rem;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .subject-hero-title {
        font-size: 1.75rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}