/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
    /* Light Theme */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 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);
    
    /* Brand Colors - Customizable */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    
    /* Status Colors */
    --success-color: #10b981;
    --success-bg: #d1fae5;
    --warning-color: #f59e0b;
    --warning-bg: #fef3c7;
    --danger-color: #ef4444;
    --danger-bg: #fee2e2;
    --info-color: #3b82f6;
    --info-bg: #dbeafe;
    
    /* Sidebar */
    --sidebar-bg: #1e1b4b;
    --sidebar-text: #e2e8f0;
    --sidebar-hover: rgba(255, 255, 255, 0.1);
    --sidebar-active: var(--primary-color);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --sidebar-bg: #0f0d24;
    --success-bg: #064e3b;
    --warning-bg: #78350f;
    --danger-bg: #7f1d1d;
    --info-bg: #1e3a5f;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

a:hover {
    text-decoration: underline;
}

.hidden {
    display: none !important;
}

/* ============================================
   Loading Screen
   ============================================ */
.loading-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    z-index: 9999;
}

.loader {
    text-align: center;
}

.loader i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: block;
    animation: spin 2s linear infinite;
}

.loader p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ============================================
   Setup Screen
   ============================================ */
.setup-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
}

.setup-container {
    max-width: 700px;
    width: 100%;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 3rem;
    box-shadow: var(--shadow-xl);
}

.setup-header {
    text-align: center;
    margin-bottom: 2rem;
}

.setup-header i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.setup-header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

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

.setup-steps {
    margin-bottom: 2rem;
}

.step {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.step-number {
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.step-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.setup-form h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.setup-note {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--info-bg);
    color: var(--info-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

/* ============================================
   Login Page
   ============================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    position: relative;
}

.login-container {
    width: 100%;
    max-width: 420px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-xl);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.login-logo i {
    font-size: 2.5rem;
    color: white;
}

.login-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.login-header h1 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.login-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    background: var(--bg-tertiary);
    padding: 0.25rem;
    border-radius: var(--radius-md);
}

.tab-btn {
    flex: 1;
    padding: 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

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

.login-form {
    margin-bottom: 1.5rem;
}

.error-message {
    padding: 0.75rem;
    background: var(--danger-bg);
    color: var(--danger-color);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.login-footer {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

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

.login-page .theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.login-page .theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ============================================
   Dashboard Layout
   ============================================ */
.dashboard {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar .logo {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.sidebar .logo i {
    font-size: 1.5rem;
    color: white;
}

.sidebar .logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sidebar-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.3;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: var(--transition-fast);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--sidebar-hover);
    text-decoration: none;
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.2);
    border-left-color: var(--primary-color);
    color: white;
}

.nav-item i {
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-footer .logout-btn {
    width: 100%;
    background: #ef4444 !important;
    color: white !important;
    border: none !important;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition-normal);
}

.sidebar-footer .logout-btn:hover {
    background: #dc2626 !important;
    transform: translateY(-1px);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.top-header {
    height: 70px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    gap: 1rem;
    position: sticky;
    top: 0;
    z-index: 50;
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.2rem;
}

.header-title {
    flex: 1;
}

.header-title h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-info span {
    font-weight: 500;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
}

.badge-success {
    background: var(--success-bg);
    color: var(--success-color);
}

.badge-warning {
    background: var(--warning-bg);
    color: var(--warning-color);
}

.badge-danger {
    background: var(--danger-bg);
    color: var(--danger-color);
}

.badge-info {
    background: var(--info-bg);
    color: var(--info-color);
}

.content-area {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

/* ============================================
   Page Sections
   ============================================ */
.page {
    animation: fadeIn 0.3s ease;
}

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

/* Notices Section */
.notices-section {
    margin-bottom: 1.5rem;
}

.banners-container {
    margin-bottom: 1rem;
}

.banner-item {
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 1rem;
    cursor: pointer;
    transition: var(--transition-normal);
}

.banner-item:hover {
    transform: scale(1.01);
}

.banner-item img {
    width: 100%;
    height: auto;
    display: block;
}

.notices-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.notice-item {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.notice-item.normal {
    background: var(--info-bg);
    border-left: 4px solid var(--info-color);
}

.notice-item.important {
    background: var(--warning-bg);
    border-left: 4px solid var(--warning-color);
}

.notice-item.urgent {
    background: var(--danger-bg);
    border-left: 4px solid var(--danger-color);
}

.notice-item i {
    font-size: 1.25rem;
    margin-top: 0.1rem;
}

.notice-item.normal i { color: var(--info-color); }
.notice-item.important i { color: var(--warning-color); }
.notice-item.urgent i { color: var(--danger-color); }

.notice-content h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.notice-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.notice-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(0, 0, 0, 0.15);
    border-radius: var(--radius-sm);
    color: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    margin-top: 0.5rem;
}

.notice-link:hover {
    background: rgba(0, 0, 0, 0.25);
    text-decoration: none;
    transform: translateX(3px);
}

.notice-link i {
    font-size: 0.8rem;
}

/* Welcome Card */
.welcome-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    padding: 2rem;
    color: white;
    margin-bottom: 1.5rem;
}

.welcome-content h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.welcome-content p {
    opacity: 0.9;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.stat-info h3 {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.stat-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Quick Actions */
.quick-actions h3,
.admin-quick-actions h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    color: var(--text-primary);
    min-width: 140px;
}

.action-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.action-btn i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.action-btn span {
    font-size: 0.9rem;
    font-weight: 500;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.page-header h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
}

.filters {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.filters select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

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

.content-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.content-card.locked {
    opacity: 0.7;
}

.content-card.locked:hover {
    transform: none;
}

.card-thumbnail {
    height: 160px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-thumbnail i {
    font-size: 3rem;
    color: var(--text-muted);
}

.card-thumbnail .play-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.content-card:hover .play-overlay {
    opacity: 1;
}

.play-overlay i {
    font-size: 3rem;
    color: white;
}

.locked-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
}

.locked-overlay i {
    font-size: 2rem;
    color: white;
    margin-bottom: 0.5rem;
}

.locked-overlay span {
    font-size: 0.9rem;
}

.card-content {
    padding: 1rem;
}

.card-badges {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.card-content h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.card-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* Empty State */
.empty-state {
    grid-column: 1 / -1;
    padding: 4rem 2rem;
    text-align: center;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.1rem;
}

/* Content Loading Spinner */
.content-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.content-loading i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    animation: spin 1s linear infinite;
}

.content-loading p {
    font-size: 1rem;
}

/* ============================================
   Forms
   ============================================ */
.form-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.form-card h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 1rem;
}

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

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input[type="color"] {
    padding: 0.25rem;
    height: 48px;
    cursor: pointer;
}

.form-group input[type="file"] {
    padding: 0.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.file-name {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--success-color);
}

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

/* Logo Upload */
.logo-upload {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.logo-preview {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.logo-preview i {
    font-size: 3rem;
    color: white;
}

.logo-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.logo-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Color Presets */
.color-presets {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.color-preset {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    border: 3px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
}

.color-preset:hover {
    transform: scale(1.1);
}

.color-preset.active {
    border-color: var(--text-primary);
}

/* Video Source Tabs */
.video-source-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.source-tab {
    flex: 1;
    min-width: 100px;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.source-tab i {
    font-size: 1.1rem;
}

.source-tab:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
}

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

/* Video Source Input Panels */
.video-source-input {
    padding: 1.25rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px dashed var(--border-color);
    margin-bottom: 1rem;
}

.video-source-input label {
    font-weight: 600;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.video-source-input input[type="url"],
.video-source-input input[type="text"] {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
}

.video-source-input input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.video-source-input .text-muted {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Thumbnail Preview */
.thumbnail-preview,
.banner-preview {
    margin-top: 0.75rem;
    border-radius: var(--radius-md);
    overflow: hidden;
    max-width: 200px;
}

.thumbnail-preview img,
.banner-preview img {
    width: 100%;
    height: auto;
    display: block;
}

/* Danger Zone */
.danger-zone {
    border-color: var(--danger-color);
}

.danger-zone h3 {
    color: var(--danger-color);
}

/* ============================================
   Data Tables
   ============================================ */
.data-table-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.data-table tr:hover {
    background: var(--bg-tertiary);
}

.data-table tr:last-child td {
    border-bottom: none;
}

.table-actions {
    display: flex;
    gap: 0.5rem;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

.btn-outline:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-sm);
}

/* ============================================
   Modals
   ============================================ */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.1rem;
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.modal-close {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition-fast);
}

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

.modal-body {
    padding: 1.5rem;
}

/* Video Modal */
.video-modal-content {
    max-width: 900px;
}

.video-modal-body {
    padding: 0;
    position: relative;
    background: #000;
}

.video-container {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
}

.video-container iframe,
.video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-watermark {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.5);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    pointer-events: none;
}

/* Google Drive Blocker - Covers the "Open in new window" button */
.gdrive-blocker {
    position: absolute;
    top: 0;
    right: 0;
    width: 60px;
    height: 60px;
    background: #000;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom-left-radius: 8px;
}

.gdrive-blocker i {
    color: #333;
    font-size: 1.2rem;
}

.gdrive-top-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: linear-gradient(to bottom, #000 0%, #000 70%, transparent 100%);
    z-index: 99;
    pointer-events: none;
}

/* Teacher Info Bar - Simple & Clean */
.teacher-info-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1rem 0;
    margin: 1.5rem 0;
    flex-wrap: wrap;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.teacher-info-bar .teacher-photo {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-color);
}

.teacher-info-bar .teacher-photo-placeholder {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
}

.teacher-info-bar .teacher-details {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.teacher-info-bar .teacher-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.teacher-info-bar .teacher-class {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.teacher-info-bar .divider {
    width: 1px;
    height: 30px;
    background: var(--border-color);
}

.teacher-contact-icons {
    display: flex;
    gap: 0.4rem;
}

.teacher-contact-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.teacher-contact-icons a:hover {
    transform: scale(1.1);
    color: white;
}

.teacher-contact-icons a.email-link:hover { background: #EA4335; }
.teacher-contact-icons a.phone-link:hover { background: #10b981; }
.teacher-contact-icons a.whatsapp-link:hover { background: #25D366; }
.teacher-contact-icons a.facebook-link:hover { background: #1877F2; }
.teacher-contact-icons a.youtube-link:hover { background: #FF0000; }

@media (max-width: 480px) {
    .teacher-info-bar {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .teacher-info-bar .divider {
        display: none;
    }
}

.video-protection-notice {
    padding: 0.75rem;
    background: var(--warning-bg);
    color: var(--warning-color);
    text-align: center;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* PDF Modal */
.pdf-modal-content {
    max-width: 900px;
    height: 90vh;
}

.pdf-modal-body {
    height: calc(100% - 70px);
    padding: 0;
}

.pdf-viewer-container {
    width: 100%;
    height: 100%;
    position: relative;
    user-select: none;
    -webkit-user-select: none;
}

.pdf-viewer-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Protected PDF Viewer Styles */
.pdf-protected-viewer {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.pdf-protected-viewer iframe {
    width: 100%;
    height: 100%;
    border: none;
    pointer-events: auto;
}

.pdf-protected-viewer .pdf-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-30deg);
    font-size: 3rem;
    font-weight: 700;
    color: rgba(0, 0, 0, 0.07);
    pointer-events: none;
    z-index: 10;
    white-space: nowrap;
    user-select: none;
}

[data-theme="dark"] .pdf-protected-viewer .pdf-watermark {
    color: rgba(255, 255, 255, 0.05);
}

/* Block PDF toolbar (download, print buttons) */
.pdf-protected-viewer .pdf-toolbar-blocker {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 52px;
    background: var(--bg-secondary);
    z-index: 15;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.pdf-protected-viewer .pdf-toolbar-blocker::after {
    content: "Viewing Only - Download Disabled";
    font-weight: 500;
}

/* Block PDF bottom bar */
.pdf-protected-viewer .pdf-bottom-blocker {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 30px;
    background: linear-gradient(to top, var(--bg-secondary) 60%, transparent);
    z-index: 15;
    pointer-events: none;
}

/* Prevent printing via CSS */
@media print {
    .pdf-protected-viewer,
    .pdf-modal-content {
        display: none !important;
    }
}

/* ============================================
   Toast Notification
   ============================================ */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-secondary);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    z-index: 2000;
    animation: slideIn 0.3s ease;
    border-left: 4px solid var(--success-color);
}

.toast i {
    font-size: 1.25rem;
    color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.error i {
    color: var(--danger-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .login-container {
        padding: 1.5rem;
    }
    
    .setup-container {
        padding: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .filters {
        width: 100%;
    }
    
    .filters select {
        flex: 1;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        justify-content: center;
    }
    
    .data-table-container {
        overflow-x: auto;
    }
    
    .data-table {
        min-width: 600px;
    }
    
    .user-info span:not(.badge) {
        display: none;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .welcome-card {
        padding: 1.5rem;
    }
    
    .welcome-content h2 {
        font-size: 1.25rem;
    }
    
    .action-btn {
        min-width: 100px;
        padding: 1rem 1.25rem;
    }
    
    .toast {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }
}

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

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

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

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

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .sidebar,
    .top-header,
    .theme-toggle,
    .modal {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
    }
}

/* ============================================
   Maintenance Page
   ============================================ */
/* Super Admin Notices for Teacher */
.super-admin-notices-container {
    margin-bottom: 1.5rem;
}

.super-admin-notice {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-left: 4px solid var(--primary-color);
    border: 1px solid var(--border-color);
}

.super-admin-notice.normal {
    border-left: 4px solid #6366f1;
}

.super-admin-notice.warning {
    border-left: 4px solid #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

.super-admin-notice.critical {
    border-left: 4px solid #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.super-admin-notice .notice-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.super-admin-notice .notice-header i {
    font-size: 1.2rem;
}

.super-admin-notice.normal .notice-header i { color: #6366f1; }
.super-admin-notice.warning .notice-header i { color: #f59e0b; }
.super-admin-notice.critical .notice-header i { color: #ef4444; }

.super-admin-notice .notice-header strong {
    flex: 1;
}

.super-admin-notice .notice-header .dismiss-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
}

.super-admin-notice .notice-header .dismiss-btn:hover {
    color: var(--text-primary);
}

.super-admin-notice p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.super-admin-notice small {
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* ============================================
   Maintenance Page
   ============================================ */
.maintenance-page {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    padding: 2rem;
}

.maintenance-content {
    text-align: center;
    max-width: 500px;
}

.maintenance-content i {
    font-size: 5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: block;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.05); }
}

.maintenance-content h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.maintenance-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}