@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

        :root {
            --bg-primary: #0a0e1a;
            --bg-secondary: #111827;
            --bg-card: #1a1f2e;
            --bg-hover: #242b3d;
            --border-subtle: #2d3748;
            --border-hover: #4a5568;
            --text-primary: #f7fafc;
            --text-secondary: #a0aec0;
            --text-muted: #718096;
            --accent: #3b82f6;
            --accent-hover: #2563eb;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.15), 0 2px 4px -1px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2), 0 4px 6px -2px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.25), 0 10px 10px -5px rgba(0, 0, 0, 0.1);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            min-height: 100vh;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* Hidden Admin Access */
        .hidden-admin-trigger {
            position: fixed;
            bottom: 0;
            right: 0;
            width: 20px;
            height: 20px;
            cursor: pointer;
            z-index: 9999;
            opacity: 0;
        }

        /* Modals */
        .modal-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.85);
            backdrop-filter: blur(4px);
            z-index: 10000;
            align-items: center;
            justify-content: center;
            padding: 24px;
            overflow-y: auto;
        }

        .modal-overlay.active {
            display: flex;
        }

        .modal {
            background: var(--bg-card);
            padding: 40px;
            border-radius: var(--radius-lg);
            width: 100%;
            max-width: 600px;
            border: 1px solid var(--border-subtle);
            box-shadow: var(--shadow-xl);
            position: relative;
            max-height: 90vh;
            overflow-y: auto;
        }

        .modal-close {
            position: absolute;
            top: 20px;
            right: 20px;
            background: none;
            border: none;
            color: var(--text-muted);
            font-size: 24px;
            cursor: pointer;
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

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

        /* Form Elements */
        .form-group {
            margin-bottom: 24px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            text-transform: uppercase;
            letter-spacing: 0.025em;
        }

        .form-group input, .form-group select, .form-group textarea {
            width: 100%;
            padding: 14px 18px;
            background: var(--bg-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            color: var(--text-primary);
            font-size: 16px;
            font-weight: 400;
            transition: var(--transition);
            font-family: inherit;
        }

        .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }

        .btn {
            width: 100%;
            padding: 16px 24px;
            background: var(--accent);
            color: white;
            border: none;
            border-radius: var(--radius-md);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            letter-spacing: 0.025em;
        }

        .btn:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn:active {
            transform: translateY(0);
        }

        .error-message {
            color: #fc8181;
            font-size: 14px;
            margin-top: 16px;
            text-align: center;
            display: none;
            font-weight: 500;
        }

        .success-message {
            color: #68d391;
            font-size: 14px;
            margin-top: 16px;
            text-align: center;
            display: none;
            font-weight: 500;
        }

        /* Members Area Header */
        #members-area {
            display: block;
            min-height: 100vh;
        }

        .header {
            background: rgba(17, 24, 39, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-subtle);
            padding: 20px 32px;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-content {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.025em;
        }

        .header-actions {
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .user-info {
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
        }

        /* Buttons */
        .btn-small {
            padding: 10px 20px;
            font-size: 14px;
            width: auto;
            font-weight: 600;
        }

        .btn-secondary {
            background: var(--bg-hover);
            border: 1px solid var(--border-subtle);
        }

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

        .btn-danger {
            background: #dc2626;
        }

        .btn-danger:hover {
            background: #b91c1c;
        }

        /* Container & Layout */
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 48px 32px;
        }

        .page-header {
            margin-bottom: 48px;
        }

        .page-title {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 12px;
            color: var(--text-primary);
            letter-spacing: -0.025em;
            line-height: 1.2;
        }

        .page-subtitle {
            color: var(--text-secondary);
            font-size: 17px;
            font-weight: 400;
            max-width: 600px;
            line-height: 1.6;
        }

        /* Back Button */
        .back-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 32px;
            padding: 12px 24px;
            background: var(--bg-card);
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            letter-spacing: 0.025em;
        }

        .back-btn:hover {
            background: var(--bg-hover);
            color: var(--text-primary);
            border-color: var(--border-hover);
            transform: translateX(-4px);
        }

        .back-btn svg {
            transition: var(--transition);
        }

        .back-btn:hover svg {
            transform: translateX(-2px);
        }

        /* Breadcrumbs */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 32px;
            font-size: 14px;
            font-weight: 500;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
            padding: 4px 8px;
            margin: -4px -8px;
            border-radius: var(--radius-sm);
            cursor: pointer;
        }

        .breadcrumb a:hover {
            color: var(--accent-hover);
            background: rgba(59, 130, 246, 0.1);
        }

        .breadcrumb-separator {
            color: var(--text-muted);
            font-weight: 400;
        }

        .breadcrumb-current {
            color: var(--text-secondary);
            font-weight: 600;
        }

        /* Premium Card Grid */
        .premium-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 32px;
        }

        @media (min-width: 640px) {
            .premium-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .premium-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 40px;
            }
        }

        /* Premium Card Design */
        .premium-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            cursor: pointer;
            display: flex;
            flex-direction: column;
            height: 100%;
            position: relative;
        }

        .premium-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
            opacity: 0;
            transition: var(--transition);
        }

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

        .premium-card:hover::before {
            opacity: 1;
        }

        .card-image-wrapper {
            position: relative;
            width: 100%;
            padding-top: 56.25%;
            background: var(--bg-secondary);
            overflow: hidden;
        }

        .card-image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .premium-card:hover .card-image {
            transform: scale(1.05);
        }

        .card-content {
            padding: 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .card-title {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
            line-height: 1.3;
            letter-spacing: -0.01em;
        }

        .card-description {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
            flex: 1;
            margin-bottom: 24px;
        }

        .card-action {
            padding: 14px 24px;
            background: var(--accent);
            color: white;
            border: none;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            letter-spacing: 0.025em;
        }

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

        /* Topic Content Page */
        .topic-hero {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            margin-bottom: 48px;
            box-shadow: var(--shadow-md);
        }

        .topic-hero-image {
            width: 100%;
            height: 400px;
            object-fit: cover;
            display: block;
        }

        .topic-hero-content {
            padding: 40px;
        }

        .topic-hero-title {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-primary);
            letter-spacing: -0.025em;
            line-height: 1.2;
        }

        .topic-hero-description {
            color: var(--text-secondary);
            font-size: 17px;
            line-height: 1.8;
            max-width: 800px;
        }

        /* Main Video Section */
        .main-video-section {
            margin-bottom: 48px;
        }

        .section-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 24px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border-subtle);
        }

        .section-header h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.01em;
        }

        .section-icon {
            width: 32px;
            height: 32px;
            background: var(--accent);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
        }

        .video-wrapper {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

        .video-container {
            position: relative;
            width: 100%;
            padding-top: 56.25%;
            background: var(--bg-secondary);
        }

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

        /* Shorts Section */
        .shorts-section {
            margin-bottom: 48px;
        }

        .shorts-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
        }

        @media (min-width: 640px) {
            .shorts-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .shorts-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .short-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }

        .short-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--border-hover);
        }

        .short-video-container {
            position: relative;
            width: 100%;
            padding-top: 177.78%;
            background: var(--bg-secondary);
        }

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

        .short-label {
            padding: 16px;
            text-align: center;
            font-weight: 600;
            color: var(--text-secondary);
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        /* Learning Tools Container */
        .learning-tools-container {
            display: flex;
            flex-direction: column;
            gap: 48px;
        }

        /* Premium Learning Blocks */
        .learning-block {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .learning-block:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--border-hover);
        }

        .block-header-text {
            padding: 48px;
            text-align: center;
        }

        .block-header-text h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 20px;
            letter-spacing: -0.025em;
            line-height: 1.2;
        }

        .block-header-text p {
            color: var(--text-secondary);
            font-size: 17px;
            line-height: 1.8;
            max-width: 600px;
            margin: 0 auto;
        }

        .block-text-only {
            padding: 40px;
        }

        .block-text-only h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }

        .block-text-only p {
            color: var(--text-secondary);
            line-height: 1.8;
            font-size: 16px;
        }

        .block-image-text {
            padding: 40px;
        }

        .block-image-text img {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: var(--radius-md);
            margin-bottom: 32px;
            box-shadow: var(--shadow-md);
        }

        .block-image-text h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }

        .block-image-text p {
            color: var(--text-secondary);
            line-height: 1.8;
            font-size: 16px;
        }

        .video-info {
            padding: 28px;
        }

        .video-info h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }

        .video-info p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.6;
        }

        /* Admin Panel */
        #admin-panel {
            display: none;
            min-height: 100vh;
            background: var(--bg-primary);
        }

        .admin-sidebar {
            background: var(--bg-card);
            border-right: 1px solid var(--border-subtle);
            padding: 32px 24px;
            position: fixed;
            left: 0;
            top: 0;
            height: 100vh;
            width: 280px;
            overflow-y: auto;
            z-index: 200;
        }

        .admin-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 40px;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border-subtle);
            letter-spacing: -0.025em;
        }

        .admin-nav {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .admin-nav-item {
            padding: 14px 18px;
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: var(--transition);
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.025em;
            border: 1px solid transparent;
        }

        .admin-nav-item:hover {
            background: var(--bg-hover);
            color: var(--text-primary);
            border-color: var(--border-subtle);
        }

        .admin-nav-item.active {
            background: var(--accent);
            color: white;
            border-color: var(--accent);
        }

        .admin-main {
            margin-left: 280px;
            padding: 40px;
            min-height: 100vh;
        }

        .admin-section {
            display: none;
            max-width: 1200px;
        }

        .admin-section.active {
            display: block;
        }

        .admin-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 40px;
            flex-wrap: wrap;
            gap: 20px;
        }

        .admin-header h2 {
            font-size: 28px;
            font-weight: 800;
            letter-spacing: -0.025em;
        }

        .btn-primary {
            background: var(--accent);
            width: auto;
            padding: 12px 24px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
        }

        .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* Forms */
        .form-section {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 32px;
            margin-bottom: 32px;
            box-shadow: var(--shadow-sm);
        }

        .form-section h3 {
            margin-bottom: 24px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.01em;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
            margin-bottom: 24px;
        }

        @media (min-width: 768px) {
            .form-row {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        .file-input-wrapper {
            position: relative;
            overflow: hidden;
            display: inline-block;
            width: 100%;
        }

        .file-input-wrapper input[type=file] {
            position: absolute;
            left: -9999px;
        }

        .file-input-label {
            display: block;
            padding: 16px;
            background: var(--bg-secondary);
            border: 2px dashed var(--border-subtle);
            border-radius: var(--radius-md);
            color: var(--text-secondary);
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            font-weight: 500;
        }

        .file-input-label:hover {
            border-color: var(--accent);
            color: var(--text-primary);
            background: var(--bg-hover);
        }

        .preview-image {
            max-width: 200px;
            max-height: 150px;
            border-radius: var(--radius-md);
            margin-top: 16px;
            display: none;
            box-shadow: var(--shadow-md);
        }

        /* Video Input Sections */
        .video-input-section {
            background: var(--bg-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 24px;
            margin-bottom: 24px;
        }

        .video-input-section h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .video-input-section h4 span {
            color: var(--accent);
        }

        .short-inputs-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
        }

        @media (min-width: 768px) {
            .short-inputs-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        .short-input-item {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .short-input-item label {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-secondary);
            min-width: 60px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .short-input-item input {
            flex: 1;
            padding: 12px 16px;
            background: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-size: 14px;
        }

        .short-input-item input:focus {
            outline: none;
            border-color: var(--accent);
        }

        .input-hint {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 8px;
            font-style: italic;
        }

        /* Lists */
        .items-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .list-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .list-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--border-hover);
        }

        .list-item-info {
            flex: 1;
            min-width: 200px;
        }

        .list-item-title {
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
            font-size: 16px;
            letter-spacing: -0.01em;
        }

        .list-item-meta {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
        }

        .list-item-actions {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .thumbnail-small {
            width: 64px;
            height: 64px;
            object-fit: cover;
            border-radius: var(--radius-sm);
            background: var(--bg-secondary);
            box-shadow: var(--shadow-sm);
        }

        .status-badge {
            display: inline-block;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .status-active {
            background: rgba(16, 185, 129, 0.15);
            color: #68d391;
        }

        .status-suspended {
            background: rgba(245, 158, 11, 0.15);
            color: #f6ad55;
        }

        /* Content Builder */
        .block-builder-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 24px;
            margin-bottom: 16px;
            position: relative;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .block-builder-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--border-hover);
        }

        .block-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 16px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border-subtle);
        }

        .block-type-label {
            font-weight: 700;
            color: var(--accent);
            text-transform: uppercase;
            font-size: 11px;
            letter-spacing: 0.1em;
        }

        .block-actions {
            display: flex;
            gap: 10px;
        }

        .drag-handle {
            cursor: move;
            color: var(--text-muted);
            padding: 8px;
            border: none;
            background: none;
            font-size: 20px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .drag-handle:hover {
            color: var(--text-primary);
            background: var(--bg-hover);
        }

        .content-type-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 16px;
            margin-bottom: 32px;
        }

        .content-type-btn {
            padding: 24px 16px;
            background: var(--bg-card);
            border: 2px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            color: var(--text-secondary);
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            font-size: 14px;
            font-weight: 600;
        }

        .content-type-btn:hover {
            border-color: var(--accent);
            color: var(--text-primary);
            background: var(--bg-hover);
            transform: translateY(-2px);
        }

        .content-type-btn.selected {
            border-color: var(--accent);
            background: rgba(59, 130, 246, 0.1);
            color: var(--accent);
        }

        /* Empty States */
        .empty-state {
            text-align: center;
            padding: 64px 32px;
            color: var(--text-muted);
        }

        .empty-state-icon {
            font-size: 56px;
            margin-bottom: 20px;
            opacity: 0.7;
        }

        .empty-state p {
            font-size: 16px;
            font-weight: 500;
        }

        .hidden {
            display: none !important;
        }

        /* Mobile Menu */
        .mobile-menu-btn {
            display: none;
            position: fixed;
            top: 20px;
            left: 20px;
            z-index: 201;
            background: var(--accent);
            color: white;
            border: none;
            padding: 12px 16px;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-weight: 600;
            box-shadow: var(--shadow-lg);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .admin-sidebar {
                transform: translateX(-100%);
                transition: transform 0.3s ease;
            }

            .admin-sidebar.open {
                transform: translateX(0);
            }

            .admin-main {
                margin-left: 0;
                padding: 24px;
            }

            .mobile-menu-btn {
                display: block;
            }

            .container {
                padding: 32px 20px;
            }

            .page-title {
                font-size: 28px;
            }

            .card-content {
                padding: 24px;
            }

            .topic-hero-image {
                height: 250px;
            }

            .topic-hero-content {
                padding: 24px;
            }

            .topic-hero-title {
                font-size: 24px;
            }

            .block-header-text {
                padding: 32px 24px;
            }

            .block-header-text h2 {
                font-size: 24px;
            }

            .shorts-grid {
                grid-template-columns: 1fr;
            }
        }

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

        .premium-card, .learning-block, .list-item, .topic-hero, .short-card {
            animation: fadeIn 0.4s ease-out;
        }

        /* Scrollbar Styling */
        ::-webkit-scrollbar {
            width: 10px;
            height: 10px;
        }

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

        ::-webkit-scrollbar-thumb {
            background: var(--border-subtle);
            border-radius: 5px;
        }

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