/* ============================================
   الموسوعة التعليمية الجزائرية - Main Stylesheet
   Font: IBM Plex Sans Arabic
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Light Theme */
    --primary: #4361ee;
    --primary-dark: #3a0ca3;
    --primary-light: #7209b7;
    --secondary: #f72585;
    --accent: #4cc9f0;
    --success: #06d6a0;
    --warning: #ffd166;
    --danger: #ef476f;
    
    /* Neutrals */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #6c757d;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.08);
    
    /* Level Colors */
    --level-primary: #06d6a0;
    --level-primary-dark: #05927a;
    --level-bem: #4361ee;
    --level-bem-dark: #3a0ca3;
    --level-bac: #7209b7;
    --level-bac-dark: #560bad;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Font */
    --font-family: 'IBM Plex Sans Arabic', sans-serif;
    
    /* Navbar */
    --navbar-height: 72px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #2a2a4a;
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0c0;
    --text-muted: #8888a0;
    --border-color: #2a2a4a;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
    background: rgba(15, 15, 26, 0.9);
}

.navbar.scrolled {
    box-shadow: 0 4px 30px var(--shadow-color);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
    background: rgba(67, 97, 238, 0.08);
}

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

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: scale(1.05);
}

.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

.nav-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
}

.nav-menu-btn span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--navbar-height);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: 0;
}

[data-theme="dark"] .hero-bg {
    background: linear-gradient(135deg, #1a1a3e 0%, #2d1b69 100%);
}

.hero-shapes {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: white;
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: white;
    bottom: -50px;
    left: -50px;
    animation-delay: -5s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: white;
    top: 50%;
    left: 50%;
    animation-delay: -10s;
}

.shape-4 {
    width: 150px;
    height: 150px;
    background: var(--accent);
    top: 20%;
    right: 20%;
    animation-delay: -15s;
    opacity: 0.15;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(15px, 15px) scale(1.02); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    padding: var(--spacing-3xl) var(--spacing-xl);
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.title-line {
    display: block;
}

.gradient-text {
    background: linear-gradient(135deg, #fff, #4cc9f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
}

.stat-label {
    font-size: 0.85rem;
    opacity: 0.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn-primary {
    background: white;
    color: var(--primary-dark);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.btn-outline {
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: white;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: translateY(-2px);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.05rem;
}

.btn-level {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: var(--spacing-md) var(--spacing-xl);
    width: 100%;
    justify-content: center;
}

.btn-level:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-indicator {
    width: 28px;
    height: 44px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: 14px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-dot {
    width: 4px;
    height: 10px;
    background: white;
    border-radius: 2px;
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(12px); opacity: 0.3; }
}

/* ============================================
   SECTIONS COMMON
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(67, 97, 238, 0.1);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   LEVELS SECTION
   ============================================ */
.levels-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-xl);
}

.level-card {
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-slow);
    position: relative;
}

.level-card:hover {
    transform: translateY(-8px);
}

.level-card-inner {
    padding: var(--spacing-2xl);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
}

.level-card:hover .level-card-inner {
    box-shadow: 0 20px 60px var(--shadow-color);
    border-color: transparent;
}

.level-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.level-primary .level-icon {
    background: linear-gradient(135deg, rgba(6, 214, 160, 0.15), rgba(6, 214, 160, 0.05));
    color: var(--level-primary);
}

.level-bem .level-icon {
    background: linear-gradient(135deg, rgba(67, 97, 238, 0.15), rgba(67, 97, 238, 0.05));
    color: var(--level-bem);
}

.level-bac .level-icon {
    background: linear-gradient(135deg, rgba(114, 9, 183, 0.15), rgba(114, 9, 183, 0.05));
    color: var(--level-bac);
}

.level-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.level-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.level-desc {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
}

.level-subjects-count {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(67, 97, 238, 0.08);
    border-radius: var(--radius-md);
    display: inline-block;
}

/* ============================================
   RESOURCES SECTION
   ============================================ */
.resources-section {
    padding: var(--spacing-3xl) 0;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.resource-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.resource-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--shadow-color);
    border-color: var(--primary);
}

.resource-logo {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.resource-info {
    flex-grow: 1;
    min-width: 0;
}

.resource-info h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 2px;
    color: var(--text-primary);
}

.resource-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.resource-arrow {
    color: var(--text-muted);
    font-size: 1.2rem;
    transition: all var(--transition-fast);
}

.resource-card:hover .resource-arrow {
    color: var(--primary);
    transform: translateX(-4px);
}

/* ============================================
   TEACHERS SECTION
   ============================================ */
.teachers-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.teachers-filter {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

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

.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.teacher-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.teacher-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--shadow-color);
    border-color: var(--primary);
}

.teacher-avatar {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.teacher-info {
    flex-grow: 1;
    min-width: 0;
}

.teacher-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.teacher-subject {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.teacher-level {
    display: inline-block;
    font-size: 0.7rem;
    padding: 2px 8px;
    background: rgba(67, 97, 238, 0.1);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-weight: 500;
}

.teacher-yt-link {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: #ff0000;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.teacher-yt-link:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-section {
    padding: var(--spacing-3xl) 0;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.feature-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--shadow-color);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: rgba(67, 97, 238, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.feature-text h4 {
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.feature-text p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-brand .logo-icon {
    font-size: 2rem;
}

.footer-brand .logo-text {
    font-size: 1.2rem;
    font-weight: 700;
}

.footer-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links h4 {
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ============================================
   MODALS
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

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

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    transform: translateY(20px) scale(0.95);
    transition: all var(--transition-base);
}

.modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-lg {
    max-width: 1000px;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--danger);
    color: white;
}

.modal-header {
    padding: var(--spacing-2xl) var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.modal-header p {
    opacity: 0.9;
}

.modal-body {
    padding: var(--spacing-xl) var(--spacing-2xl) var(--spacing-2xl);
}

/* Subject Grid in Modal */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.subject-card {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.subject-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow-color);
    border-color: var(--primary);
    background: var(--bg-primary);
}

.subject-card-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.subject-card-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* Subject Modal */
.subject-modal-header {
    padding: var(--spacing-2xl) var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.subject-tabs {
    display: flex;
    gap: 0;
    padding: 0 var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.subject-tab {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.subject-tab:hover {
    color: var(--primary);
}

.subject-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.subject-modal-body {
    padding: var(--spacing-xl) var(--spacing-2xl) var(--spacing-2xl);
}

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

.resource-list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.resource-list-item:hover {
    background: var(--bg-primary);
    border-color: var(--primary);
    transform: translateX(-4px);
}

.resource-list-item .item-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: rgba(67, 97, 238, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.resource-list-item .item-info {
    flex-grow: 1;
}

.resource-list-item .item-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.resource-list-item .item-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   CHATBOT
   ============================================ */
.chatbot-container {
    position: fixed;
    bottom: var(--spacing-xl);
    left: var(--spacing-xl);
    z-index: 1500;
}

.chatbot-toggle {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 30px rgba(67, 97, 238, 0.4);
    transition: all var(--transition-fast);
}

.chatbot-toggle:hover {
    transform: scale(1.08);
    box-shadow: 0 12px 40px rgba(67, 97, 238, 0.5);
}

.chatbot-toggle .close-icon {
    display: none;
}

.chatbot-toggle.active .chat-icon {
    display: none;
}

.chatbot-toggle.active .close-icon {
    display: block;
}

.chatbot-window {
    position: absolute;
    bottom: 75px;
    left: 0;
    width: 380px;
    max-height: 520px;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.95);
    transition: all var(--transition-base);
}

.chatbot-window.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.chatbot-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.chatbot-header-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.chatbot-avatar {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.chatbot-header h4 {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.chatbot-status {
    font-size: 0.75rem;
    color: var(--success);
    font-weight: 500;
}

.chatbot-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-height: 340px;
}

.message {
    display: flex;
    gap: var(--spacing-sm);
    animation: messageIn 0.3s ease;
}

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

.user-message {
    justify-content: flex-start;
    flex-direction: row-reverse;
}

.bot-message {
    justify-content: flex-start;
}

.message-content {
    max-width: 85%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    line-height: 1.7;
}

.bot-message .message-content {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-top-right-radius: var(--radius-sm);
}

.user-message .message-content {
    background: var(--primary);
    color: white;
    border-top-left-radius: var(--radius-sm);
}

.chatbot-input {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.chatbot-input input {
    flex-grow: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    font-family: var(--font-family);
    font-size: 0.9rem;
    color: var(--text-primary);
    outline: none;
    transition: all var(--transition-fast);
}

.chatbot-input input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
}

.chatbot-input button {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.chatbot-input button:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-sm) var(--spacing-md);
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: typingDot 1.4s infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingDot {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-8px); opacity: 1; }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 30px var(--shadow-color);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-menu-btn {
        display: flex;
    }
    
    .hero-stats {
        gap: var(--spacing-lg);
    }
    
    .levels-grid {
        grid-template-columns: 1fr;
    }
    
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    .teachers-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .chatbot-window {
        width: calc(100vw - 40px);
        left: 0;
    }
    
    .modal-content {
        margin: var(--spacing-md);
        max-height: 90vh;
    }
    
    .subjects-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Selection */
::selection {
    background: rgba(67, 97, 238, 0.2);
    color: var(--primary-dark);
}

/* Loading Animation */
.loading-skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}