/* roulang page: index */
:root {
            --color-bg-primary: #0d0416;
            --color-bg-secondary: #1a0a28;
            --color-panel: #1e1438;
            --color-panel-dark: #2d1b4e;
            --color-border: #8b5cf6;
            --color-border-hover: #ff00ff;
            --color-text: #e0d5f5;
            --color-text-muted: #a78bca;
            --color-text-dim: #6b5488;
            --color-accent-start: #8b5cf6;
            --color-accent-end: #00ffff;
            --color-accent-alt-start: #ff6b00;
            --color-accent-alt-end: #ffea00;
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background: var(--color-bg-primary);
            color: var(--color-text);
            line-height: 1.6;
            overflow-x: hidden;
        }

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

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

        button, input {
            font-family: inherit;
        }

        .sidebar {
            position: fixed;
            left: 0;
            top: 0;
            width: 240px;
            height: 100vh;
            background: var(--color-bg-primary);
            border-right: 1px solid var(--color-border);
            z-index: 100;
            overflow-y: auto;
        }

        .sidebar-logo {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 1.5rem;
            border-bottom: 1px solid var(--color-border);
        }

        .sidebar-logo-text {
            font-family: "Courier New", Consolas, monospace;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text);
            text-align: center;
            line-height: 1.3;
        }

        .sidebar-nav {
            padding: 1.5rem 0;
        }

        .sidebar-nav-item {
            display: block;
            padding: 0.75rem 1.5rem;
            color: var(--color-text-muted);
            font-size: 1rem;
            transition: all 200ms;
            position: relative;
        }

        .sidebar-nav-item:hover {
            color: var(--color-text);
            background: rgba(139, 92, 246, 0.1);
        }

        .sidebar-nav-item.active {
            color: var(--color-text);
            background: rgba(139, 92, 246, 0.15);
            font-weight: 600;
        }

        .sidebar-nav-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--color-border);
        }

        .sidebar-footer {
            padding: 1.5rem;
            border-top: 1px solid var(--color-border);
            margin-top: auto;
        }

        .sidebar-footer-link {
            display: block;
            font-size: 0.875rem;
            color: var(--color-text-dim);
            padding: 0.5rem 0;
            transition: color 200ms;
        }

        .sidebar-footer-link:hover {
            color: var(--color-text-muted);
        }

        .main-content {
            margin-left: 240px;
            min-height: 100vh;
        }

        .hero-section {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(180deg, #1a0a28 0%, #0d0416 100%);
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: 
                repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.02) 2px, rgba(255,255,255,0.02) 4px),
                repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(255,255,255,0.02) 2px, rgba(255,255,255,0.02) 4px);
            opacity: 0.5;
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 1200px;
            padding: 2rem;
        }

        .hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 700;
            margin: 0 0 1.5rem 0;
            line-height: 1.2;
            font-family: "Courier New", Consolas, monospace;
        }

        .hero-title-gradient {
            background: linear-gradient(90deg, #ff00ff, #00ffff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.25rem;
            color: var(--color-text-muted);
            margin: 0 0 2rem 0;
            line-height: 1.6;
        }

        .hero-cta {
            display: inline-block;
            padding: 1rem 3rem;
            background: linear-gradient(135deg, #8b5cf6 0%, #00ffff 100%);
            border: none;
            border-radius: 4px;
            color: #fff;
            font-size: 1.125rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 300ms;
            position: relative;
            overflow: hidden;
        }

        .hero-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 20px rgba(139, 92, 246, 0.6), 0 0 40px rgba(0, 255, 255, 0.4);
        }

        .hero-cta::before {
            content: '';
            position: absolute;
            top: -100%;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(180deg, rgba(255,255,255,0.3), transparent);
            animation: scanline 2s linear infinite;
        }

        @keyframes scanline {
            0% { top: -100%; }
            100% { top: 100%; }
        }

        .section {
            padding: 6rem 2rem;
            max-width: 1400px;
            margin: 0 auto;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin: 0 0 1rem 0;
            text-align: center;
            text-shadow: 0 0 8px currentColor;
            letter-spacing: 0.05em;
        }

        .section-desc {
            font-size: 1.125rem;
            color: var(--color-text-muted);
            text-align: center;
            max-width: 800px;
            margin: 0 auto 3rem auto;
            line-height: 1.7;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin-top: 3rem;
        }

        .feature-card {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 2rem;
            transition: all 200ms;
        }

        .feature-card:hover {
            border-color: var(--color-border-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #8b5cf6, #00ffff);
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }

        .feature-title {
            font-size: 1.25rem;
            font-weight: 600;
            margin: 0 0 0.75rem 0;
        }

        .feature-desc {
            font-size: 0.9375rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin: 0;
        }

        .highlight-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-top: 3rem;
        }

        .highlight-card {
            background: linear-gradient(135deg, #2d1b4e 0%, #1a2a4a 100%);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 1.5rem;
            position: relative;
            overflow: hidden;
        }

        .highlight-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.03) 2px, rgba(255,255,255,0.03) 4px);
            pointer-events: none;
        }

        .highlight-badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background: rgba(139, 92, 246, 0.3);
            border: 1px solid var(--color-border);
            border-radius: 2px;
            font-size: 0.875rem;
            margin-bottom: 0.75rem;
        }

        .highlight-title {
            font-size: 1.125rem;
            font-weight: 600;
            margin: 0 0 0.5rem 0;
        }

        .highlight-bar {
            height: 4px;
            background: rgba(139, 92, 246, 0.2);
            border-radius: 2px;
            overflow: hidden;
            margin-top: 1rem;
        }

        .highlight-bar-fill {
            height: 100%;
            background: linear-gradient(90deg, #8b5cf6, #00ffff);
            width: 85%;
        }

        .stats-container {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 2.5rem;
            margin-top: 3rem;
            text-align: center;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .stat-item {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            font-family: "Courier New", Consolas, monospace;
            background: linear-gradient(90deg, #ff00ff, #00ffff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin: 0 0 0.5rem 0;
        }

        .stat-label {
            font-size: 1rem;
            color: var(--color-text-muted);
        }

        .content-list {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 2rem;
            margin-top: 3rem;
        }

        .content-list-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 0 0 1.5rem 0;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--color-border);
        }

        .content-item {
            display: flex;
            align-items: center;
            padding: 1rem 0;
            border-bottom: 1px solid rgba(139, 92, 246, 0.1);
            transition: all 200ms;
        }

        .content-item:hover {
            padding-left: 0.5rem;
            color: var(--color-text);
        }

        .content-item:last-child {
            border-bottom: none;
        }

        .content-item-dot {
            width: 6px;
            height: 6px;
            background: var(--color-border);
            border-radius: 50%;
            margin-right: 1rem;
        }

        .content-item-text {
            flex: 1;
            font-size: 0.9375rem;
            color: var(--color-text-muted);
        }

        .content-item-tag {
            padding: 0.25rem 0.5rem;
            background: rgba(139, 92, 246, 0.2);
            border: 1px solid var(--color-border);
            border-radius: 2px;
            font-size: 0.75rem;
            margin-left: 1rem;
        }

        .faq-container {
            margin-top: 3rem;
            max-width: 900px;
            margin-left: auto;
            margin-right: auto;
        }

        .faq-item {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            margin-bottom: 1rem;
            overflow: hidden;
        }

        .faq-question {
            padding: 1.25rem 1.5rem;
            font-size: 1.0625rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: background 200ms;
        }

        .faq-question:hover {
            background: rgba(139, 92, 246, 0.1);
        }

        .faq-answer {
            padding: 0 1.5rem 1.25rem 1.5rem;
            font-size: 0.9375rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            background: var(--color-bg-primary);
        }

        .cta-section {
            background: linear-gradient(135deg, #2d1b4e 0%, #1a2a4a 100%);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 4rem 2rem;
            text-align: center;
            margin-top: 3rem;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.03) 2px, rgba(255,255,255,0.03) 4px);
            pointer-events: none;
        }

        .cta-title {
            font-size: 2rem;
            font-weight: 700;
            margin: 0 0 1rem 0;
            position: relative;
            z-index: 2;
        }

        .cta-desc {
            font-size: 1.125rem;
            color: var(--color-text-muted);
            margin: 0 0 2rem 0;
            position: relative;
            z-index: 2;
        }

        .cta-button {
            display: inline-block;
            padding: 1rem 3rem;
            background: linear-gradient(135deg, #ff6b00 0%, #ffea00 100%);
            border: none;
            border-radius: 4px;
            color: #fff;
            font-size: 1.125rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 300ms;
            position: relative;
            z-index: 2;
        }

        .cta-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 20px rgba(255, 107, 0, 0.6), 0 0 40px rgba(255, 234, 0, 0.4);
        }

        .footer {
            background: var(--color-bg-primary);
            border-top: 1px solid var(--color-border);
            padding: 4rem 2rem 2rem 2rem;
        }

        .footer-content {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
        }

        .footer-section-title {
            font-size: 1.125rem;
            font-weight: 600;
            margin: 0 0 1rem 0;
        }

        .footer-text {
            font-size: 0.9375rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin: 0;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-link-item {
            margin-bottom: 0.75rem;
        }

        .footer-link {
            font-size: 0.9375rem;
            color: var(--color-text-dim);
            transition: color 200ms;
        }

        .footer-link:hover {
            color: var(--color-text);
        }

        .footer-bottom {
            max-width: 1400px;
            margin: 3rem auto 0 auto;
            padding-top: 2rem;
            border-top: 1px solid rgba(139, 92, 246, 0.2);
            text-align: center;
            font-size: 0.8125rem;
            color: var(--color-text-dim);
        }

        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: var(--color-bg-primary);
            border-bottom: 1px solid var(--color-border);
            z-index: 200;
            align-items: center;
            padding: 0 1rem;
        }

        .mobile-logo {
            flex: 1;
            text-align: center;
            font-family: "Courier New", Consolas, monospace;
            font-size: 1rem;
            font-weight: 700;
        }

        .mobile-menu-btn {
            width: 40px;
            height: 40px;
            background: none;
            border: 1px solid var(--color-border);
            border-radius: 4px;
            color: var(--color-text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .mobile-menu-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(26, 10, 40, 0.95);
            z-index: 150;
            backdrop-filter: blur(8px);
        }

        .mobile-menu-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100%;
            gap: 2rem;
        }

        .mobile-menu-item {
            font-size: 1.5rem;
            color: var(--color-text);
            padding: 1rem 2rem;
            transition: all 200ms;
        }

        .mobile-menu-item:hover {
            color: var(--color-border-hover);
        }

        @media (max-width: 1024px) {
            .sidebar {
                display: none;
            }

            .main-content {
                margin-left: 0;
            }

            .mobile-nav {
                display: flex;
            }

            .section {
                padding: 4rem 1.5rem;
            }

            .hero-section {
                padding-top: 64px;
            }

            .hero-title {
                font-size: 2rem;
            }

            .hero-subtitle {
                font-size: 1rem;
            }

            .hero-cta {
                padding: 0.75rem 2rem;
                font-size: 1rem;
            }

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

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

            .stats-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }

            .footer-content {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }

        @media (max-width: 520px) {
            .section-title {
                font-size: 1.5rem;
            }

            .section-desc {
                font-size: 1rem;
            }

            .feature-card {
                padding: 1.5rem;
            }

            .cta-section {
                padding: 3rem 1.5rem;
            }

            .cta-title {
                font-size: 1.5rem;
            }

            .cta-button {
                padding: 0.75rem 2rem;
                font-size: 1rem;
            }
        }

/* roulang page: category2 */
:root {
            --color-bg-primary: #0d0416;
            --color-bg-secondary: #1a0a28;
            --color-panel: #1e1438;
            --color-panel-deep: #2d1b4e;
            --color-border: #8b5cf6;
            --color-border-bright: #ff00ff;
            --color-text: #e0d5f5;
            --color-text-muted: #a78bca;
            --color-text-dim: #6b5488;
            --color-accent-cyan: #00ffff;
            --color-accent-orange: #ff6b00;
            --color-accent-yellow: #ffea00;
            --radius-sm: 4px;
            --radius-md: 8px;
            --spacing-unit: 1.5rem;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background: var(--color-bg-primary);
            color: var(--color-text);
            line-height: 1.6;
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 200ms;
        }

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

        button, input {
            font-family: inherit;
        }

        .sidebar {
            position: fixed;
            left: 0;
            top: 0;
            width: 240px;
            height: 100vh;
            background: var(--color-bg-primary);
            border-right: 1px solid var(--color-border);
            z-index: 100;
            display: flex;
            flex-direction: column;
        }

        .sidebar-logo {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            font-weight: 700;
            font-family: "Courier New", Consolas, monospace;
            color: var(--color-text);
            border-bottom: 1px solid rgba(139, 92, 246, 0.2);
            letter-spacing: 0.02em;
        }

        .sidebar-nav {
            flex: 1;
            padding: 1.5rem 0;
            display: flex;
            flex-direction: column;
        }

        .sidebar-nav-item {
            height: 48px;
            padding-left: 1.5rem;
            display: flex;
            align-items: center;
            font-size: 1rem;
            color: var(--color-text-muted);
            transition: all 200ms;
            position: relative;
        }

        .sidebar-nav-item:hover {
            color: var(--color-text);
        }

        .sidebar-nav-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 0;
            background: var(--color-border);
            transition: height 200ms;
        }

        .sidebar-nav-item:hover::before {
            height: 24px;
        }

        .sidebar-nav-item.active {
            color: var(--color-text);
            font-weight: 600;
            background: rgba(139, 92, 246, 0.15);
        }

        .sidebar-nav-item.active::before {
            height: 24px;
        }

        .main-content {
            margin-left: 240px;
            min-height: 100vh;
            background: var(--color-bg-primary);
        }

        .page-header {
            padding: 3rem 2rem 2rem;
            background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
            position: relative;
            overflow: hidden;
        }

        .page-header::before {
            content: '';
            position: absolute;
            inset: 0;
            background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.02) 2px, rgba(255,255,255,0.02) 4px);
            pointer-events: none;
        }

        .breadcrumb {
            font-size: 0.875rem;
            color: var(--color-text-muted);
            margin-bottom: 1rem;
            position: relative;
            z-index: 1;
        }

        .breadcrumb a:hover {
            color: var(--color-border-bright);
        }

        .page-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 700;
            background: linear-gradient(90deg, #ff00ff, #00ffff);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 1rem;
            position: relative;
            z-index: 1;
        }

        .page-subtitle {
            font-size: 1.125rem;
            color: var(--color-text-muted);
            max-width: 800px;
            position: relative;
            z-index: 1;
        }

        .content-section {
            padding: 4rem 2rem;
            max-width: 1400px;
            margin: 0 auto;
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 2rem;
            text-shadow: 0 0 8px currentColor;
            letter-spacing: 0.05em;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin-bottom: 4rem;
        }

        .feature-card {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 1.5rem;
            transition: all 200ms;
        }

        .feature-card:hover {
            border-color: var(--color-border-bright);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #8b5cf6 0%, #00ffff 100%);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }

        .feature-title {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .feature-desc {
            font-size: 0.9375rem;
            color: var(--color-text-muted);
            line-height: 1.7;
        }

        .video-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
        }

        .video-card {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all 200ms;
        }

        .video-card:hover {
            border-color: var(--color-border-bright);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
        }

        .video-thumb {
            aspect-ratio: 16 / 9;
            background: var(--color-panel-deep);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .video-thumb::before {
            content: '▶';
            font-size: 3rem;
            color: rgba(255, 255, 255, 0.6);
        }

        .video-info {
            padding: 1rem;
        }

        .video-title {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .video-tags {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
            margin-bottom: 0.75rem;
        }

        .video-tag {
            font-size: 0.875rem;
            color: var(--color-text-muted);
            border: 1px solid var(--color-border);
            padding: 2px 8px;
            border-radius: 2px;
        }

        .video-action {
            width: 100%;
            padding: 0.5rem;
            background: rgba(139, 92, 246, 0.2);
            border: none;
            border-radius: var(--radius-sm);
            color: var(--color-text);
            font-size: 0.9375rem;
            cursor: pointer;
            transition: all 200ms;
        }

        .video-action:hover {
            background: linear-gradient(135deg, #8b5cf6 0%, #00ffff 100%);
            box-shadow: 0 0 20px rgba(139, 92, 246, 0.6);
        }

        .stats-panel {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 2rem;
            margin-bottom: 4rem;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
        }

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

        .stat-value {
            font-size: 2.5rem;
            font-weight: 700;
            font-family: "Courier New", Consolas, monospace;
            background: linear-gradient(90deg, #ff00ff, #00ffff);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 0.5rem;
        }

        .stat-label {
            font-size: 0.9375rem;
            color: var(--color-text-muted);
        }

        .faq-section {
            max-width: 900px;
            margin: 0 auto 4rem;
        }

        .faq-item {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            margin-bottom: 1rem;
            overflow: hidden;
        }

        .faq-question {
            padding: 1rem 1.5rem;
            font-size: 1.125rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 200ms;
        }

        .faq-question:hover {
            background: rgba(139, 92, 246, 0.1);
        }

        .faq-answer {
            padding: 0 1.5rem 1rem;
            background: var(--color-bg-primary);
            font-size: 0.9375rem;
            color: var(--color-text-muted);
            line-height: 1.7;
        }

        .cta-section {
            text-align: center;
            padding: 4rem 2rem;
            background: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 50%, var(--color-bg-primary) 100%);
            position: relative;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.02) 2px, rgba(255,255,255,0.02) 4px);
            pointer-events: none;
        }

        .cta-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1rem;
            position: relative;
            z-index: 1;
        }

        .cta-desc {
            font-size: 1.125rem;
            color: var(--color-text-muted);
            margin-bottom: 2rem;
            position: relative;
            z-index: 1;
        }

        .cta-button {
            display: inline-block;
            padding: 0.75rem 2rem;
            background: linear-gradient(135deg, #ff6b00 0%, #ffea00 100%);
            border-radius: var(--radius-sm);
            font-size: 1.125rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 200ms;
            position: relative;
            z-index: 1;
            border: none;
        }

        .cta-button:hover {
            box-shadow: 0 0 20px #ff6b00, 0 0 40px #ffea00;
            transform: translateY(-2px);
        }

        .footer {
            background: var(--color-bg-primary);
            padding: 4rem 2rem 2rem;
            border-top: 1px solid rgba(139, 92, 246, 0.2);
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-section-title {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--color-text);
        }

        .footer-text {
            font-size: 0.9375rem;
            color: var(--color-text-dim);
            line-height: 1.7;
        }

        .footer-links {
            list-style: none;
        }

        .footer-link-item {
            margin-bottom: 0.5rem;
        }

        .footer-link {
            font-size: 0.9375rem;
            color: var(--color-text-dim);
        }

        .footer-link:hover {
            color: var(--color-text);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(139, 92, 246, 0.2);
            font-size: 0.8125rem;
            color: var(--color-text-dim);
        }

        @media (max-width: 1024px) {
            .sidebar {
                display: none;
            }

            .main-content {
                margin-left: 0;
            }

            .mobile-nav {
                display: flex;
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                height: 64px;
                background: var(--color-bg-primary);
                border-bottom: 1px solid var(--color-border);
                align-items: center;
                justify-content: space-between;
                padding: 0 1rem;
                z-index: 100;
            }

            .mobile-logo {
                font-size: 1rem;
                font-weight: 700;
                font-family: "Courier New", Consolas, monospace;
            }

            .mobile-menu-btn {
                width: 40px;
                height: 40px;
                background: none;
                border: 1px solid var(--color-border);
                border-radius: var(--radius-sm);
                color: var(--color-text);
                cursor: pointer;
            }

            .page-header {
                margin-top: 64px;
                padding: 2rem 1rem 1.5rem;
            }

            .page-title {
                font-size: 1.75rem;
            }

            .content-section {
                padding: 2rem 1rem;
            }

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

        @media (max-width: 768px) {
            .feature-grid {
                grid-template-columns: 1fr;
            }

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

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1025px) {
            .mobile-nav {
                display: none;
            }
        }

/* roulang page: category1 */
:root {
            --color-bg-primary: #0d0416;
            --color-bg-secondary: #1a0a28;
            --color-panel: #1e1438;
            --color-panel-dark: #2d1b4e;
            --color-border: #8b5cf6;
            --color-border-hover: #ff00ff;
            --color-text: #e0d5f5;
            --color-text-muted: #a78bca;
            --color-text-dim: #6b5488;
            --color-accent-start: #8b5cf6;
            --color-accent-end: #00ffff;
            --color-accent-alt-start: #ff6b00;
            --color-accent-alt-end: #ffea00;
            --radius-sm: 4px;
            --radius-md: 8px;
            --spacing-unit: 1.5rem;
        }

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

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

        a {
            color: inherit;
            text-decoration: none;
            transition: color 200ms;
        }

        a:hover {
            color: var(--color-border-hover);
        }

        img {
            max-width: 100%;
            display: block;
        }

        button, input {
            font-family: inherit;
            border: none;
            outline: none;
        }

        .sidebar {
            position: fixed;
            left: 0;
            top: 0;
            width: 240px;
            height: 100vh;
            background: var(--color-bg-primary);
            border-right: 1px solid var(--color-border);
            z-index: 100;
            display: flex;
            flex-direction: column;
        }

        .sidebar-logo {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            font-weight: 700;
            font-family: "Courier New", Consolas, monospace;
            letter-spacing: 0.05em;
            color: var(--color-text);
            text-shadow: 0 0 8px currentColor;
            padding: 0 1.5rem;
            text-align: center;
            border-bottom: 1px solid var(--color-border);
        }

        .sidebar-nav {
            flex: 1;
            padding: 2rem 0;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .sidebar-nav-item {
            height: 48px;
            display: flex;
            align-items: center;
            padding-left: 1.5rem;
            color: var(--color-text-muted);
            font-size: 1rem;
            transition: all 200ms;
            position: relative;
        }

        .sidebar-nav-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 0;
            background: var(--color-border);
            transition: height 200ms;
        }

        .sidebar-nav-item:hover {
            color: var(--color-text);
            background: rgba(139, 92, 246, 0.1);
        }

        .sidebar-nav-item:hover::before {
            height: 24px;
        }

        .sidebar-nav-item.active {
            color: var(--color-text);
            font-weight: 600;
            background: rgba(139, 92, 246, 0.15);
        }

        .sidebar-nav-item.active::before {
            height: 32px;
        }

        .sidebar-footer {
            padding: 1.5rem;
            border-top: 1px solid var(--color-border);
            font-size: 0.875rem;
            color: var(--color-text-dim);
            line-height: 1.5;
        }

        .main-content {
            margin-left: 240px;
            min-height: 100vh;
            background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
            position: relative;
        }

        .main-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255,255,255,0.03) 2px, rgba(255,255,255,0.03) 4px);
            pointer-events: none;
            opacity: 0.15;
        }

        .breadcrumb {
            padding: 2rem 3rem 1rem;
            font-size: 0.875rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .breadcrumb-sep {
            color: var(--color-text-dim);
        }

        .hero-section {
            padding: 3rem 3rem 4rem;
            position: relative;
            z-index: 1;
        }

        .hero-inner {
            display: grid;
            grid-template-columns: 1fr 380px;
            gap: 3rem;
            align-items: start;
        }

        .hero-content {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 3rem;
            position: relative;
            overflow: hidden;
        }

        .hero-content::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero-title {
            font-size: clamp(2rem, 4vw, 2.75rem);
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            position: relative;
        }

        .hero-title-highlight {
            background: linear-gradient(90deg, #ff00ff, #00ffff);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 0 20px rgba(255, 0, 255, 0.5);
        }

        .hero-subtitle {
            font-size: 1.125rem;
            color: var(--color-text-muted);
            margin-bottom: 2rem;
            line-height: 1.8;
        }

        .hero-features {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-bottom: 2.5rem;
        }

        .hero-feature-tag {
            padding: 0.5rem 1rem;
            background: rgba(139, 92, 246, 0.2);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            font-size: 0.9375rem;
            color: var(--color-text);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .hero-cta {
            display: inline-flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.875rem 2.5rem;
            background: linear-gradient(135deg, var(--color-accent-start) 0%, var(--color-accent-end) 100%);
            color: #fff;
            font-weight: 600;
            font-size: 1.0625rem;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: all 200ms;
            position: relative;
            overflow: hidden;
        }

        .hero-cta::before {
            content: '';
            position: absolute;
            top: -100%;
            left: 0;
            right: 0;
            height: 100%;
            background: linear-gradient(180deg, rgba(255,255,255,0.3) 0%, transparent 100%);
            animation: scan 1.5s infinite;
            pointer-events: none;
        }

        @keyframes scan {
            0% { top: -100%; }
            100% { top: 100%; }
        }

        .hero-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 20px rgba(139, 92, 246, 0.6), 0 0 40px rgba(139, 92, 246, 0.4);
        }

        .hero-stats {
            background: var(--color-panel-dark);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 2rem;
        }

        .hero-stats-title {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 1.5rem;
            text-align: center;
            color: var(--color-text);
        }

        .stats-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .stat-item {
            background: rgba(139, 92, 246, 0.1);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 1rem 1.25rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 200ms;
        }

        .stat-item:hover {
            background: rgba(139, 92, 246, 0.15);
            border-color: var(--color-border-hover);
            transform: translateX(4px);
        }

        .stat-label {
            font-size: 0.9375rem;
            color: var(--color-text-muted);
        }

        .stat-value {
            font-size: 1.25rem;
            font-weight: 700;
            font-family: "Courier New", Consolas, monospace;
            background: linear-gradient(90deg, var(--color-accent-alt-start), var(--color-accent-alt-end));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .stat-rank {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-border);
            margin-right: 0.5rem;
        }

        .content-section {
            padding: 4rem 3rem;
            position: relative;
            z-index: 1;
        }

        .section-header {
            margin-bottom: 3rem;
        }

        .section-title {
            font-size: 1.875rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
            text-shadow: 0 0 8px currentColor;
        }

        .section-subtitle {
            font-size: 1.0625rem;
            color: var(--color-text-muted);
            line-height: 1.7;
        }

        .cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
        }

        .video-card {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all 200ms;
            cursor: pointer;
        }

        .video-card:hover {
            border-color: var(--color-border-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
        }

        .video-card-thumb {
            width: 100%;
            aspect-ratio: 16/9;
            background: var(--color-panel-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 3rem;
            color: var(--color-border);
            position: relative;
            overflow: hidden;
        }

        .video-card-thumb::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(139, 92, 246, 0.2) 0%, rgba(0, 255, 255, 0.1) 100%);
        }

        .video-card-body {
            padding: 1.25rem;
        }

        .video-card-title {
            font-size: 1.0625rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .video-card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-bottom: 1rem;
        }

        .video-tag {
            padding: 0.25rem 0.625rem;
            font-size: 0.8125rem;
            border: 1px solid var(--color-border);
            border-radius: 2px;
            color: var(--color-text-muted);
        }

        .video-card-action {
            width: 100%;
            padding: 0.625rem;
            background: rgba(139, 92, 246, 0.2);
            color: var(--color-text);
            font-size: 0.9375rem;
            font-weight: 500;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: all 200ms;
            text-align: center;
        }

        .video-card-action:hover {
            background: linear-gradient(135deg, var(--color-accent-start) 0%, var(--color-accent-end) 100%);
            color: #fff;
        }

        .features-section {
            padding: 4rem 3rem;
            background: rgba(30, 20, 56, 0.5);
            position: relative;
            z-index: 1;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 2rem;
        }

        .feature-card {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: 2rem 1.5rem;
            text-align: center;
            transition: all 200ms;
        }

        .feature-card:hover {
            border-color: var(--color-border-hover);
            transform: translateY(-4px);
        }

        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            filter: drop-shadow(0 0 8px currentColor);
        }

        .feature-title {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
        }

        .feature-desc {
            font-size: 0.9375rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }

        .faq-section {
            padding: 4rem 3rem;
            position: relative;
            z-index: 1;
        }

        .faq-list {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .faq-item {
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            overflow: hidden;
        }

        .faq-question {
            padding: 1.25rem 1.5rem;
            font-size: 1.0625rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 200ms;
        }

        .faq-question:hover {
            background: rgba(139, 92, 246, 0.1);
        }

        .faq-arrow {
            font-size: 1.25rem;
            color: var(--color-border);
            transition: transform 200ms;
        }

        .faq-answer {
            padding: 0 1.5rem 1.25rem;
            font-size: 0.9375rem;
            color: var(--color-text-muted);
            line-height: 1.7;
            background: rgba(13, 4, 22, 0.5);
        }

        .cta-section {
            padding: 5rem 3rem;
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .cta-box {
            max-width: 700px;
            margin: 0 auto;
            background: var(--color-panel);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 3rem 2rem;
            position: relative;
            overflow: hidden;
        }

        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at top, rgba(255, 0, 255, 0.15) 0%, transparent 60%);
            pointer-events: none;
        }

        .cta-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1rem;
            position: relative;
        }

        .cta-desc {
            font-size: 1.0625rem;
            color: var(--color-text-muted);
            margin-bottom: 2rem;
            line-height: 1.7;
            position: relative;
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            gap: 0.75rem;
            padding: 1rem 3rem;
            background: linear-gradient(135deg, var(--color-accent-alt-start) 0%, var(--color-accent-alt-end) 100%);
            color: #fff;
            font-weight: 700;
            font-size: 1.125rem;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: all 200ms;
            position: relative;
            overflow: hidden;
        }

        .cta-button::before {
            content: '';
            position: absolute;
            top: -100%;
            left: 0;
            right: 0;
            height: 100%;
            background: linear-gradient(180deg, rgba(255,255,255,0.3) 0%, transparent 100%);
            animation: scan 1.5s infinite;
            pointer-events: none;
        }

        .cta-button:hover {
            transform: scale(1.05);
            box-shadow: 0 0 30px rgba(255, 107, 0, 0.6), 0 0 60px rgba(255, 234, 0, 0.4);
        }

        .footer {
            background: var(--color-bg-primary);
            border-top: 1px solid var(--color-border);
            padding: 4rem 3rem 2rem;
            position: relative;
            z-index: 1;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-section-title {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--color-text);
        }

        .footer-text {
            font-size: 0.9375rem;
            color: var(--color-text-dim);
            line-height: 1.7;
        }

        .footer-links {
            list-style: none;
        }

        .footer-link-item {
            margin-bottom: 0.75rem;
        }

        .footer-link {
            font-size: 0.9375rem;
            color: var(--color-text-dim);
            transition: color 200ms;
        }

        .footer-link:hover {
            color: var(--color-text);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(139, 92, 246, 0.2);
            font-size: 0.875rem;
            color: var(--color-text-dim);
        }

        @media (max-width: 1024px) {
            .sidebar {
                display: none;
            }

            .main-content {
                margin-left: 0;
            }

            .hero-inner {
                grid-template-columns: 1fr;
            }

            .hero-stats {
                max-width: 500px;
                margin: 0 auto;
            }

            .cards-grid {
                grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            }
        }

        @media (max-width: 768px) {
            .breadcrumb,
            .hero-section,
            .content-section,
            .features-section,
            .faq-section,
            .cta-section,
            .footer {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }

            .hero-content {
                padding: 2rem 1.5rem;
            }

            .hero-title {
                font-size: 1.75rem;
            }

            .hero-subtitle {
                font-size: 1rem;
            }

            .section-title {
                font-size: 1.5rem;
            }

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

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

            .cta-title {
                font-size: 1.5rem;
            }

            .footer-content {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }