/* =============================================
   HAI Tech Academy - LMS Stylesheet
   MINIMALIST DESIGN - Clean & Modern
   ============================================= */

:root {
    /* Colors - Dark Theme */
    --bg: #0a0e1a;
    --bg-secondary: #0f1424;
    --card: #151b2e;
    --card-hover: #1a2138;
    --border: #252d45;
    --border-light: #1e2640;
    
    /* Primary */
    --primary: #6366f1;
    --primary-hover: #5558e3;
    
    /* Text */
    --text: #ffffff;
    --text-secondary: #9ca3b8;
    --text-muted: #6b7280;
    
    /* Status */
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Radius */
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 14px;
    
    /* Transitions */
    --transition: 0.2s ease;
}

/* ============================================
   Base
============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Heebo', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

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

a:hover {
    opacity: 0.8;
}

/* ============================================
   Typography
============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; }

/* ============================================
   Buttons
============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--card-hover);
    border-color: var(--primary);
}

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

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

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

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-google {
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--border);
}

/* ============================================
   Cards
============================================ */

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition);
}

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

/* ============================================
   Navbar
============================================ */

.lms-navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.navbar-logo {
    height: 36px;
    width: auto;
}

.navbar-menu {
    display: flex;
    gap: 4px;
}

.nav-link {
    padding: 8px 14px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--radius);
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text);
    background: var(--card);
}

/* User Menu */
.navbar-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color var(--transition);
    color: var(--text);
}

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

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    color: white;
}

.user-name {
    font-weight: 500;
    font-size: 0.95rem;
}

/* Dropdown */
.user-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    min-width: 180px;
    padding: 6px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition);
    z-index: 100;
}

.dropdown-menu.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: right;
    font-family: inherit;
    font-size: 0.9rem;
}

.dropdown-item:hover {
    background: var(--bg);
    color: var(--text);
}

.dropdown-menu hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 6px 0;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--text);
}

/* ============================================
   Dashboard Layout
============================================ */

.dashboard-page {
    min-height: 100vh;
}

.dashboard-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: calc(100vh - 64px);
}

/* Sidebar */
.dashboard-sidebar {
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    padding: 24px 20px;
    position: sticky;
    top: 64px;
    height: calc(100vh - 64px);
    overflow-y: auto;
}

.sidebar-section {
    margin-bottom: 28px;
}

.sidebar-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

/* Stats Cards in Sidebar */
.stats-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* Streak Display */
.streak-display {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    text-align: center;
}

.streak-flames {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.streak-count {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--warning);
}

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

/* Level Progress */
.level-progress {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
}

.level-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.level-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 0.9rem;
}

.xp-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.level-bar {
    height: 6px;
    background: var(--bg);
    border-radius: 3px;
    overflow: hidden;
}

.level-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* Main Content */
.dashboard-main {
    padding: 28px;
    max-width: 1100px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ============================================
   Course Cards
============================================ */

.courses-grid, #coursesGrid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.course-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition);
}

.course-card:hover {
    border-color: var(--primary);
}

.course-image {
    height: 140px;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--success);
    color: white;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.course-content {
    padding: 16px;
}

.course-content h3 {
    font-size: 1.05rem;
    margin-bottom: 6px;
}

.course-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 12px;
    line-height: 1.5;
}

.course-meta {
    display: flex;
    gap: 14px;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.course-progress {
    margin-bottom: 12px;
}

.progress-bar {
    height: 4px;
    background: var(--bg);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 6px;
}

.progress-fill {
    height: 100%;
    background: var(--success);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ============================================
   Login / Register Pages
============================================ */

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--bg);
}

.login-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 900px;
    width: 100%;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.login-card {
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.login-header {
    text-align: center;
    margin-bottom: 28px;
}

.login-logo {
    height: 48px;
    margin-bottom: 20px;
}

.login-header h1 {
    font-size: 1.5rem;
    margin-bottom: 6px;
}

.login-header p {
    color: var(--text-secondary);
}

.login-illustration {
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.illustration-content {
    text-align: center;
    color: white;
}

.illustration-content h2 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.illustration-content p {
    opacity: 0.9;
    margin-bottom: 24px;
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.15);
    padding: 10px 16px;
    border-radius: var(--radius);
}

.feature-icon {
    font-size: 1.25rem;
}

/* ============================================
   Forms
============================================ */

.login-form, form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    position: relative;
}

.form-group label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.toggle-password {
    position: absolute;
    left: 12px;
    top: 36px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
}

.remember-me input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

.forgot-password {
    color: var(--primary);
}

.login-divider {
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.register-link {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 12px;
    font-size: 0.95rem;
}

.register-link a {
    color: var(--primary);
    font-weight: 500;
}

.btn-login {
    margin-top: 8px;
    padding: 14px;
}

/* ============================================
   Course Page Layout
============================================ */

.course-page {
    min-height: 100vh;
}

.course-main {
    display: flex;
    flex-direction: row;
    min-height: calc(100vh - 64px);
}

.course-content {
    flex: 1;
    padding: 24px;
    max-width: 900px;
    min-width: 0;
    order: 1;
}

.lessons-sidebar {
    order: 2;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
    min-width: 300px;
    max-width: 300px;
}

/* Course Navbar */
.course-navbar {
    display: flex;
    align-items: center;
    gap: 16px;
}

.course-navbar .navbar-title {
    flex: 1;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.course-navbar .navbar-progress {
    display: flex;
    align-items: center;
    gap: 10px;
}

.progress-bar-mini {
    width: 80px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar-mini .progress-fill {
    height: 100%;
    background: var(--success);
    transition: width 0.3s ease;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: var(--radius);
    transition: color var(--transition);
    font-size: 0.95rem;
}

.back-btn:hover {
    color: var(--text);
}

.mobile-lessons-btn {
    display: none;
    background: var(--card);
    border: 1px solid var(--border);
    padding: 8px;
    border-radius: var(--radius);
    color: var(--text);
    cursor: pointer;
}

/* Lessons Sidebar */
.lessons-sidebar .sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 20px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 10;
}

.lessons-sidebar .sidebar-header h2 {
    font-size: 1rem;
    margin: 0;
}

.toggle-sidebar {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
}

/* Course Overview Card */
.course-overview-card {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
}

.overview-progress {
    display: flex;
    align-items: center;
    gap: 14px;
}

.circular-progress {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
}

.circular-progress svg {
    width: 56px;
    height: 56px;
    transform: rotate(-90deg);
}

.circle-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 3;
}

.circle-progress {
    fill: none;
    stroke: var(--primary);
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke-dasharray 0.3s ease;
}

.progress-percent {
    fill: var(--text);
    font-size: 8px;
    font-weight: 600;
    text-anchor: middle;
    transform: rotate(90deg);
    transform-origin: center;
}

.overview-stats {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Lesson Modules */
.lesson-module {
    border-bottom: 1px solid var(--border);
}

.module-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    cursor: pointer;
    background: var(--card);
    transition: background var(--transition);
}

.module-header:hover {
    background: var(--card-hover);
}

.module-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    font-size: 0.95rem;
}

.module-icon {
    font-size: 1.1rem;
}

.module-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.module-lessons {
    max-height: 1000px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.module-lessons.collapsed {
    max-height: 0;
}

.mini-progress {
    width: 50px;
    height: 3px;
    background: var(--bg);
    border-radius: 2px;
    overflow: hidden;
}

.mini-progress-fill {
    height: 100%;
    background: var(--success);
    transition: width 0.3s ease;
}

/* Lesson Items */
.lessons-list {
    padding: 6px 0;
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    cursor: pointer;
    transition: background var(--transition);
}

.lesson-item:hover {
    background: var(--card);
}

.lesson-item.active {
    background: rgba(99, 102, 241, 0.1);
    border-right: 2px solid var(--primary);
}

.lesson-item.completed {
    opacity: 0.7;
}

.lesson-item.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.lesson-item .lesson-status {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--card);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.lesson-item .lesson-status.completed {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.lesson-item .lesson-status.current {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.lesson-item .lesson-info {
    flex: 1;
    min-width: 0;
}

.lesson-item .lesson-title {
    font-size: 0.9rem;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-item .lesson-duration {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   Video Player
============================================ */

.video-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 20px;
}

.video-player {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    position: relative;
}

.video-player video,
.video-player iframe {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

.video-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background var(--transition);
}

.video-placeholder:hover {
    background: var(--card);
}

.video-placeholder svg {
    width: 56px;
    height: 56px;
    color: var(--primary);
}

/* Video Info Bar */
.video-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--card);
    border-top: 1px solid var(--border);
}

.video-info-left {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.video-info-right {
    display: flex;
    gap: 6px;
}

.video-action-btn {
    background: none;
    border: none;
    padding: 6px;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.video-action-btn:hover {
    background: var(--bg);
    color: var(--text);
}

/* Video Controls */
.video-controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    padding: 16px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin: 16px 0;
}

.control-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    transition: all var(--transition);
}

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

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

.control-btn.primary:hover {
    background: var(--primary-hover);
}

/* Quiz CTA Button */
.quiz-cta {
    display: block;
    background: var(--card);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin: 16px 0;
}

.quiz-cta[style*="display: none"] {
    display: none !important;
}

.quiz-cta-content {
    display: flex;
    align-items: center;
    gap: 14px;
}

.quiz-icon {
    font-size: 2rem;
}

.quiz-cta-text {
    flex: 1;
}

.quiz-cta-text strong {
    display: block;
    font-size: 1rem;
    margin-bottom: 2px;
}

.quiz-cta-text span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.quiz-cta .btn {
    white-space: nowrap;
}

/* ============================================
   Content Tabs
============================================ */

.content-tabs {
    display: flex;
    gap: 2px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.content-tab {
    padding: 10px 18px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
    position: relative;
    transition: color var(--transition);
}

.content-tab::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    opacity: 0;
    transition: opacity var(--transition);
}

.content-tab:hover {
    color: var(--text);
}

.content-tab.active {
    color: var(--text);
}

.content-tab.active::after {
    opacity: 1;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* ============================================
   Profile Page
============================================ */

.profile-page {
    min-height: 100vh;
}

.profile-main {
    max-width: 900px;
    margin: 0 auto;
    padding: 28px;
}

.profile-header {
    position: relative;
    margin-bottom: 28px;
}

.profile-header-bg {
    height: 140px;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    border-radius: var(--radius-lg);
}

.profile-header-content {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    padding: 0 24px;
    margin-top: -48px;
    position: relative;
    z-index: 1;
}

.profile-avatar-large {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 600;
    color: white;
    border: 4px solid var(--bg);
}

.profile-section {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
}

.profile-section h2 {
    font-size: 1.15rem;
    margin-bottom: 20px;
}

/* ============================================
   Notifications
============================================ */

.lms-notification {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 9999;
    font-weight: 500;
    font-size: 0.95rem;
}

.lms-notification.success {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--success);
}

.lms-notification.error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--error);
}

.lms-notification.info {
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text);
}

/* ============================================
   Loading States
============================================ */

.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   Empty States
============================================ */

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    color: var(--text-muted);
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text);
}

.empty-state p {
    margin-bottom: 20px;
}

/* ============================================
   Celebration Modal
============================================ */

.celebration-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.celebration-modal.visible {
    display: flex;
    opacity: 1;
    visibility: visible;
}

.celebration-content {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    max-width: 420px;
    width: 90%;
}

.celebration-icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
}

.celebration-content h2 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.celebration-content > p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.celebration-stats {
    display: flex;
    justify-content: center;
    gap: 28px;
    margin-bottom: 20px;
}

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

.celebration-stats .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.celebration-stats .stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.celebration-certificate {
    background: var(--bg);
    padding: 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
}

.celebration-certificate p {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.celebration-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.close-celebration {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--card);
    border: 1px solid var(--border);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.close-celebration:hover {
    color: var(--text);
    border-color: var(--text-muted);
}

.confetti-container {
    display: none;
}

/* ============================================
   Responsive Design
============================================ */

@media (max-width: 1024px) {
    .dashboard-container {
        grid-template-columns: 1fr;
    }
    
    .dashboard-sidebar {
        display: none;
    }
    
    .course-main {
        display: block;
    }
    
    .course-content {
        width: 100%;
        max-width: 100%;
    }
    
    .lessons-sidebar {
        display: none;
        position: fixed;
        top: 0;
        right: 0;
        width: 300px;
        height: 100vh;
        z-index: 1001;
        border-right: none;
        border-left: 1px solid var(--border);
    }
    
    .lessons-sidebar.visible {
        display: block;
    }
    
    .mobile-lessons-btn {
        display: flex;
    }
    
    .toggle-sidebar {
        display: flex;
    }
    
    .course-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.6);
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .course-overlay.visible {
        opacity: 1;
        visibility: visible;
    }
}

@media (max-width: 768px) {
    .lms-navbar {
        padding: 0 16px;
        height: 60px;
    }
    
    .navbar-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .user-name {
        display: none;
    }
    
    .login-container {
        grid-template-columns: 1fr;
    }
    
    .login-illustration {
        display: none;
    }
    
    .login-card {
        padding: 28px 20px;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-main {
        padding: 20px 16px;
    }
    
    .video-controls {
        flex-wrap: wrap;
    }
    
    .control-btn .btn-text {
        display: none;
    }
    
    .quiz-cta-content {
        flex-direction: column;
        text-align: center;
    }
    
    .quiz-cta .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 1.4rem; }
    h2 { font-size: 1.2rem; }
    
    .btn {
        padding: 10px 18px;
        font-size: 0.9rem;
    }
    
    .profile-header-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .profile-avatar-large {
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }
    
    .profile-section {
        padding: 18px;
    }
}

/* ============================================
   Utility Classes
============================================ */

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

.text-center { text-align: center; }
.text-right { text-align: right; }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.flex { display: flex; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }

/* Filter tabs */
.filter-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 8px 16px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 20px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all var(--transition);
}

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

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

/* ============================================
   Catalog Page
============================================ */

.catalog-page {
    min-height: 100vh;
}

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

.catalog-hero {
    text-align: center;
    padding: 40px 0 30px;
}

.catalog-hero h1 {
    font-size: 1.75rem;
    margin-bottom: 8px;
}

.catalog-hero p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.search-container {
    max-width: 400px;
    margin: 0 auto 20px;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.search-box input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text);
    font-size: 0.95rem;
    outline: none;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box svg {
    color: var(--text-muted);
}

.search-clear {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0;
}

.quick-filters {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.quick-filter {
    padding: 8px 16px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

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

.catalog-content {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 30px;
    padding-bottom: 40px;
}

/* Filters Sidebar */
.filters-sidebar {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    height: fit-content;
    position: sticky;
    top: 84px;
}

.filters-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.filters-header h2 {
    font-size: 1rem;
    margin: 0;
}

.clear-filters {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 0.85rem;
    cursor: pointer;
    font-family: inherit;
}

.filter-group {
    margin-bottom: 20px;
}

.filter-title {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.filter-option input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

.filter-option:hover {
    color: var(--text);
}

/* Courses Grid */
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.courses-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.courses-count {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.sort-select {
    padding: 8px 12px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
}

/* Mobile Filter Toggle */
.filter-toggle-btn,
.mobile-filter-btn {
    display: none;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
    font-family: inherit;
    margin-bottom: 16px;
}

/* Catalog Responsive */
@media (max-width: 900px) {
    .catalog-content {
        grid-template-columns: 1fr;
    }
    
    .filters-sidebar {
        display: none;
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        height: 100vh;
        z-index: 1001;
        border-radius: 0;
        overflow-y: auto;
    }
    
    .filters-sidebar.visible {
        display: block;
    }
    
    .filter-toggle-btn,
    .mobile-filter-btn {
        display: flex;
    }
    
    .filter-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.6);
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .filter-overlay.visible {
        opacity: 1;
        visibility: visible;
    }
}

@media (max-width: 600px) {
    .catalog-hero {
        padding: 24px 0 20px;
    }
    
    .catalog-hero h1 {
        font-size: 1.4rem;
    }
    
    .catalog-hero p {
        font-size: 0.95rem;
    }
    
    .quick-filters {
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
    }
    
    .quick-filter {
        flex-shrink: 0;
    }
    
    .catalog-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   AI Assistant - HIDE ON MOBILE
============================================ */

.ai-assistant,
#aiAssistant,
.open-assistant,
#openAssistant {
    display: none !important;
}

/* Lesson Objectives styling */
.lesson-objectives {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-top: 20px;
}

.lesson-objectives h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    margin-bottom: 14px;
    color: var(--text);
}

.lesson-objectives ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.lesson-objectives li {
    padding: 8px 0;
    padding-right: 20px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
    border-bottom: 1px solid var(--border);
}

.lesson-objectives li:last-child {
    border-bottom: none;
}

.lesson-objectives li::before {
    content: '•';
    position: absolute;
    right: 0;
    color: var(--primary);
}

/* Tab content area */
.tab-content {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

#lessonTitle {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

#lessonDescription {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

/* Notes area */
.notes-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

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

.notes-header h3 {
    font-size: 1rem;
    margin: 0;
}

#userNotes {
    width: 100%;
    min-height: 150px;
    padding: 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
}

#userNotes:focus {
    outline: none;
    border-color: var(--primary);
}

.notes-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* Resources list */
.resources-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.resource-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    transition: border-color var(--transition);
}

.resource-item:hover {
    border-color: var(--primary);
}

.resource-icon {
    font-size: 1.25rem;
}

.resource-info {
    flex: 1;
}

.resource-title {
    display: block;
    font-weight: 500;
}

.resource-size {
    font-size: 0.85rem;
    color: var(--text-muted);
}