/* roulang page: index */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: #111827;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border-color: #1E293B;
            --border-glow: rgba(0, 240, 255, 0.3);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-primary);
            font-family: var(--font-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--accent-cyan);
        }

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

        button,
        .button {
            cursor: pointer;
            font-family: var(--font-main);
            border: none;
            outline: none;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: background var(--transition-fast);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 20px;
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

        .logo i {
            color: var(--accent-cyan);
            font-size: 1.4rem;
            text-shadow: var(--shadow-neon);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 6px 0;
            transition: color var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-primary);
        }

        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
        }

        .btn-login:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 12px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-fast);
        }

        .btn-signup:hover {
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
            color: #fff;
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            cursor: pointer;
        }

        /* Hero Section */
        .hero-section {
            padding: 120px 0 60px;
            background: radial-gradient(ellipse at 30% 20%, rgba(0, 82, 255, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 60%, rgba(0, 240, 255, 0.08) 0%, transparent 60%),
                var(--bg-primary);
            border-bottom: 1px solid var(--border-color);
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.25);
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-bottom: 20px;
        }

        .hero-badge i {
            animation: pulse-dot 1.8s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.4;
            }
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 18px;
            background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 28px;
            max-width: 520px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            font-weight: 700;
            padding: 14px 30px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            box-shadow: 0 0 16px rgba(0, 82, 255, 0.5);
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-primary:hover {
            box-shadow: 0 0 28px rgba(0, 82, 255, 0.8);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-outline {
            background: transparent;
            border: 1.5px solid var(--accent-cyan);
            color: var(--accent-cyan);
            font-weight: 700;
            padding: 14px 30px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-outline:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.3);
            color: var(--accent-cyan);
        }

        .hero-visual {
            position: relative;
        }

        .hero-visual img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-neon), var(--shadow-card);
            border: 1px solid rgba(0, 240, 255, 0.2);
        }

        .group-badge {
            position: absolute;
            bottom: -16px;
            left: 20px;
            right: 20px;
            background: rgba(8, 9, 15, 0.9);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .group-count {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--accent-cyan);
        }

        .group-avatars {
            display: flex;
            align-items: center;
            gap: -8px;
        }

        .group-avatars span {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--accent-blue);
            border: 2px solid var(--bg-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            font-weight: 700;
        }

        /* Sections Common */
        .section {
            padding: 70px 0;
        }

        .section-label {
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--accent-cyan);
            margin-bottom: 10px;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
            line-height: 1.25;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 680px;
        }

        /* Security Badge Bar */
        .badge-bar {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 32px 0;
        }

        .badge-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }

        .badge-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
        }

        .badge-item i {
            font-size: 2.2rem;
            color: var(--accent-cyan);
            text-shadow: var(--shadow-neon);
        }

        .badge-item span {
            font-weight: 700;
            font-size: 0.95rem;
        }

        .badge-item p {
            color: var(--text-muted);
            font-size: 0.85rem;
            margin: 0;
        }

        /* Feature Intro */
        .feature-intro {
            background: var(--bg-primary);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            transition: all var(--transition-fast);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            opacity: 0;
            transition: opacity var(--transition-fast);
        }

        .feature-card:hover {
            border-color: rgba(0, 240, 255, 0.4);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.1);
            transform: translateY(-4px);
        }

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

        .feature-card i {
            font-size: 2rem;
            color: var(--accent-cyan);
            margin-bottom: 14px;
        }

        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .feature-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* Speed Overview */
        .speed-section {
            background: var(--bg-secondary);
        }

        .speed-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .speed-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .speed-icon {
            width: 50px;
            height: 50px;
            border-radius: var(--radius-sm);
            background: rgba(0, 240, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--accent-cyan);
        }

        .speed-info h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 4px;
        }

        .speed-info span {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent-cyan);
        }

        /* News Section */
        .news-section {
            background: var(--bg-primary);
        }

        .news-layout {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 30px;
        }

        .news-list {
            list-style: none;
        }

        .news-list li {
            border-bottom: 1px solid var(--border-color);
            padding: 16px 0;
            display: flex;
            justify-content: space-between;
            align-items: baseline;
            gap: 16px;
            transition: all var(--transition-fast);
        }

        .news-list li:hover {
            padding-left: 8px;
            border-bottom-color: var(--accent-cyan);
        }

        .news-list a {
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            flex: 1;
        }

        .news-list a:hover {
            color: var(--accent-cyan);
        }

        .news-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            white-space: nowrap;
        }

        .news-sidebar {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px;
        }

        .news-sidebar h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--accent-cyan);
        }

        .sidebar-item {
            display: flex;
            gap: 12px;
            margin-bottom: 16px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border-color);
        }

        .sidebar-item:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }

        .sidebar-item img {
            width: 60px;
            height: 60px;
            border-radius: var(--radius-sm);
            object-fit: cover;
        }

        .sidebar-item a {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-primary);
            line-height: 1.4;
        }

        .sidebar-item a:hover {
            color: var(--accent-cyan);
        }

        /* Timeline */
        .timeline-section {
            background: var(--bg-secondary);
        }

        .timeline {
            position: relative;
            padding-left: 30px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(180deg, var(--accent-blue), var(--accent-cyan));
        }

        .timeline-item {
            position: relative;
            margin-bottom: 32px;
            padding-left: 20px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -26px;
            top: 6px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--accent-cyan);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
            border: 3px solid var(--bg-secondary);
        }

        .timeline-item h4 {
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 6px;
        }

        .timeline-item p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.08), rgba(0, 240, 255, 0.05));
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 48px 36px;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 14px;
        }

        .cta-section p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            margin-bottom: 28px;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }

        /* FAQ */
        .faq-section {
            background: var(--bg-primary);
        }

        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            border-color: rgba(0, 240, 255, 0.4);
        }

        .faq-item h4 {
            font-weight: 700;
            font-size: 1.05rem;
            margin-bottom: 10px;
            color: var(--accent-cyan);
        }

        .faq-item p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 20px;
            bottom: 80px;
            z-index: 999;
            width: 52px;
            height: 52px;
            border-radius: 50px;
            background: rgba(8, 9, 15, 0.75);
            backdrop-filter: blur(12px);
            border: 1.5px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all var(--transition-fast);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.35);
        }

        .fab-left::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            border-radius: 50px;
            background: linear-gradient(135deg, #00F0FF, #0052FF);
            z-index: -1;
            opacity: 0.9;
        }

        .fab-left i {
            color: #fff;
            font-size: 1.4rem;
        }

        .fab-left:hover {
            transform: scale(1.12);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.6);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }

        .footer-brand h3 {
            font-size: 1.3rem;
            font-weight: 800;
            margin-bottom: 12px;
        }

        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        .footer-col h4 {
            font-weight: 700;
            font-size: 0.95rem;
            margin-bottom: 14px;
            color: var(--accent-cyan);
        }

        .footer-col a {
            display: block;
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 8px;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* Mobile Nav */
        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(8, 9, 15, 0.98);
            z-index: 2000;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 28px;
        }

        .mobile-menu.active {
            display: flex;
        }

        .mobile-menu a {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .mobile-close {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 1.8rem;
            color: var(--text-primary);
            background: none;
            border: none;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
            }
            .hero-visual {
                order: -1;
                max-width: 480px;
                margin: 0 auto;
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .speed-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .news-layout {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .badge-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .hero-title {
                font-size: 2rem;
            }
            .feature-grid,
            .speed-grid {
                grid-template-columns: 1fr;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .badge-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.7rem;
            }
            .hero-actions {
                flex-direction: column;
            }
            .badge-grid {
                grid-template-columns: 1fr;
            }
            .group-badge {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: #111827;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border-color: #1E293B;
            --border-glow: rgba(0, 240, 255, 0.3);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }
        
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        
        body {
            background-color: var(--bg-primary);
            color: var(--text-primary);
            font-family: var(--font-main);
            line-height: 1.6;
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }
        
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        
        a:hover {
            color: var(--accent-cyan);
        }
        
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        
        button,
        .button {
            cursor: pointer;
            font-family: var(--font-main);
            border: none;
            outline: none;
        }
        
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: background var(--transition-fast);
        }
        
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 20px;
            max-width: 1280px;
            margin: 0 auto;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        
        .logo i {
            color: var(--accent-cyan);
            font-size: 1.4rem;
            text-shadow: var(--shadow-neon);
        }
        
        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        
        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 6px 0;
            transition: color var(--transition-fast);
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }
        
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-primary);
        }
        
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .btn-login {
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            background: none;
        }
        
        .btn-login:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }
        
        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 12px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-fast);
        }
        
        .btn-signup:hover {
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
            color: #fff;
        }
        
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            cursor: pointer;
        }
        
        .page-banner {
            padding: 140px 0 60px;
            background: radial-gradient(ellipse at 20% 30%, rgba(0, 82, 255, 0.12) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 70%, rgba(0, 240, 255, 0.06) 0%, transparent 50%),
                var(--bg-primary);
            border-bottom: 1px solid var(--border-color);
        }
        
        .banner-content {
            max-width: 900px;
        }
        
        .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.25);
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-bottom: 24px;
        }
        
        .banner-badge i {
            animation: pulse-dot 1.8s infinite;
        }
        
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.4;
            }
        }
        
        .banner-title {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 18px;
            color: var(--text-primary);
        }
        
        .banner-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
            max-width: 750px;
        }
        
        .section-padding {
            padding: 80px 0;
        }
        
        .section-label {
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--accent-cyan);
            margin-bottom: 12px;
        }
        
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--text-primary);
            line-height: 1.3;
        }
        
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 40px;
            max-width: 800px;
        }
        
        .info-block {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            margin-bottom: 40px;
            transition: all var(--transition-fast);
        }
        
        .info-block:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card);
        }
        
        .info-block-header {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            margin-bottom: 24px;
        }
        
        .info-icon {
            flex-shrink: 0;
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.2), rgba(0, 240, 255, 0.1));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 240, 255, 0.2);
        }
        
        .info-block-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.3;
        }
        
        .info-block-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        
        .checklist {
            list-style: none;
            padding: 0;
            margin: 24px 0 0;
        }
        
        .checklist li {
            padding: 12px 0 12px 32px;
            position: relative;
            font-size: 0.98rem;
            color: var(--text-secondary);
            line-height: 1.6;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }
        
        .checklist li::before {
            content: '\f00c';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 14px;
            color: var(--accent-cyan);
            font-size: 0.85rem;
        }
        
        .warning-list {
            list-style: none;
            padding: 0;
            margin: 24px 0 0;
        }
        
        .warning-list li {
            padding: 12px 0 12px 32px;
            position: relative;
            font-size: 0.98rem;
            color: var(--text-secondary);
            line-height: 1.6;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }
        
        .warning-list li::before {
            content: '\f071';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 14px;
            color: #FF4500;
            font-size: 0.85rem;
        }
        
        .stat-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }
        
        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            text-align: left;
            transition: all var(--transition-fast);
        }
        
        .stat-card:hover {
            border-color: var(--border-glow);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
        }
        
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--accent-cyan);
            line-height: 1;
            margin-bottom: 8px;
        }
        
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
        }
        
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
            margin-top: 32px;
        }
        
        .tip-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px;
            transition: all var(--transition-fast);
        }
        
        .tip-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        
        .tip-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--accent-blue);
            opacity: 0.6;
            line-height: 1;
            margin-bottom: 16px;
        }
        
        .tip-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.4;
        }
        
        .tip-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }
        
        .faq-section {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        
        .faq-item:hover {
            border-color: var(--border-glow);
        }
        
        .faq-question {
            padding: 20px 24px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1.05rem;
            user-select: none;
            transition: background var(--transition-fast);
        }
        
        .faq-question:hover {
            background: rgba(255, 255, 255, 0.02);
        }
        
        .faq-question i {
            font-size: 0.9rem;
            color: var(--accent-cyan);
            transition: transform var(--transition-fast);
        }
        
        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
            font-size: 0.98rem;
        }
        
        .faq-item.open .faq-answer {
            display: block;
        }
        
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        
        .cta-section {
            background: radial-gradient(ellipse at center, rgba(0, 82, 255, 0.2) 0%, transparent 70%),
                var(--bg-primary);
            border-top: 1px solid var(--border-color);
            text-align: left;
        }
        
        .cta-box {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 48px;
            position: relative;
            overflow: hidden;
        }
        
        .cta-box::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        
        .cta-box h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }
        
        .cta-box p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 28px;
            max-width: 600px;
            position: relative;
            z-index: 1;
        }
        
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 18px rgba(0, 82, 255, 0.5);
            transition: all var(--transition-fast);
            position: relative;
            z-index: 1;
        }
        
        .btn-cta:hover {
            box-shadow: 0 0 28px rgba(0, 82, 255, 0.8);
            transform: translateY(-2px);
            color: #fff;
        }
        
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-brand h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }
        
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        
        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }
        
        .footer-col a:hover {
            color: var(--accent-cyan);
        }
        
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.6;
        }
        
        .fab-float {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 999;
            width: 52px;
            height: 52px;
            border-radius: 50px;
            background: rgba(8, 9, 15, 0.75);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.4rem;
            cursor: pointer;
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
            transition: all var(--transition-fast);
            opacity: 0.7;
            animation: float-breath 3s ease-in-out infinite;
        }
        
        .fab-float::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50px;
            padding: 2px;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan), var(--accent-blue));
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
        }
        
        @keyframes float-breath {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-6px);
            }
        }
        
        .fab-float:hover {
            opacity: 1;
            box-shadow: 0 0 24px rgba(0, 240, 255, 0.55);
            transform: scale(1.08);
        }
        
        .fab-notification {
            position: absolute;
            top: 6px;
            right: 6px;
            width: 10px;
            height: 10px;
            background: #FF0055;
            border-radius: 50%;
            animation: blink-dot 1.2s infinite;
        }
        
        @keyframes blink-dot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.3;
            }
        }
        
        @media screen and (max-width: 1024px) {
            .banner-title {
                font-size: 2rem;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .info-block {
                padding: 28px;
            }
        }
        
        @media screen and (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.show {
                display: flex;
            }
            .banner-title {
                font-size: 1.7rem;
            }
            .banner-desc {
                font-size: 1rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .cta-box {
                padding: 32px 24px;
            }
            .cta-box h2 {
                font-size: 1.4rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .stat-row {
                grid-template-columns: 1fr 1fr;
            }
            .tips-grid {
                grid-template-columns: 1fr;
            }
            .info-block-header {
                flex-direction: column;
                gap: 12px;
            }
            .page-banner {
                padding: 120px 0 40px;
            }
        }
        
        @media screen and (max-width: 520px) {
            .header-inner {
                padding: 10px 16px;
            }
            .logo {
                font-size: 0.95rem;
            }
            .btn-signup {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            .btn-login {
                padding: 6px 12px;
                font-size: 0.8rem;
            }
            .banner-title {
                font-size: 1.5rem;
            }
            .stat-row {
                grid-template-columns: 1fr;
            }
            .info-block {
                padding: 20px;
            }
            .info-block-title {
                font-size: 1.2rem;
            }
        }

/* roulang page: article */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: #111827;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border-color: #1E293B;
            --border-glow: rgba(0, 240, 255, 0.3);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-primary);
            font-family: var(--font-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--accent-cyan);
        }

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

        button,
        .button {
            cursor: pointer;
            font-family: var(--font-main);
            border: none;
            outline: none;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: background var(--transition-fast);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 20px;
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

        .logo i {
            color: var(--accent-cyan);
            font-size: 1.4rem;
            text-shadow: var(--shadow-neon);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 6px 0;
            transition: color var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-primary);
        }

        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            background: transparent;
        }

        .btn-login:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 12px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-fast);
        }

        .btn-signup:hover {
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
            color: #fff;
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            cursor: pointer;
        }

        .article-banner {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.2) 0%, rgba(0, 240, 255, 0.1) 100%), var(--bg-secondary);
            padding: 100px 0 50px;
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }

        .article-banner-content {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 0 auto;
            text-align: left;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 16px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .article-meta .category-tag {
            background: rgba(0, 240, 255, 0.15);
            color: var(--accent-cyan);
            padding: 4px 14px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.85rem;
            border: 1px solid rgba(0, 240, 255, 0.3);
        }

        .article-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta i {
            color: var(--accent-blue);
        }

        .article-banner h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 0;
        }

        .article-body-section {
            padding: 50px 0 60px;
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
            align-items: start;
        }

        .article-main {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-card);
        }

        .article-content {
            font-size: 1.05rem;
            line-height: 1.75;
            color: var(--text-secondary);
        }

        .article-content h2 {
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-top: 32px;
            margin-bottom: 16px;
            border-left: 4px solid var(--accent-blue);
            padding-left: 16px;
        }

        .article-content h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-top: 24px;
            margin-bottom: 12px;
        }

        .article-content p {
            margin-bottom: 16px;
        }

        .article-content ul,
        .article-content ol {
            margin-bottom: 16px;
            padding-left: 24px;
        }

        .article-content li {
            margin-bottom: 8px;
        }

        .article-content blockquote {
            background: rgba(0, 240, 255, 0.05);
            border: 1px solid rgba(0, 240, 255, 0.2);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            margin: 24px 0;
            font-style: italic;
            color: var(--text-secondary);
        }

        .article-content img {
            border-radius: var(--radius-md);
            margin: 24px 0;
        }

        .article-sidebar {
            position: sticky;
            top: 100px;
        }

        .sidebar-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px;
            margin-bottom: 24px;
        }

        .sidebar-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sidebar-card h4 i {
            color: var(--accent-cyan);
        }

        .sidebar-card .warning-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .sidebar-card .warning-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        .sidebar-card .warning-list li:last-child {
            border-bottom: none;
        }

        .sidebar-card .warning-list li i {
            color: #FF4500;
            font-size: 0.8rem;
            margin-top: 4px;
        }

        .cta-box {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.2), rgba(0, 240, 255, 0.1));
            border: 1px solid rgba(0, 240, 255, 0.4);
            border-radius: var(--radius-lg);
            padding: 28px;
            text-align: center;
        }

        .cta-box h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .cta-box p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }

        .btn-cta-sidebar {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 12px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-fast);
        }

        .btn-cta-sidebar:hover {
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.7);
            transform: translateY(-2px);
            color: #fff;
        }

        .not-found-state {
            text-align: center;
            padding: 80px 20px;
        }

        .not-found-state i {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .not-found-state h3 {
            font-size: 1.5rem;
            margin-bottom: 12px;
        }

        .not-found-state p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        .btn-back-home {
            display: inline-block;
            background: var(--accent-blue);
            color: #fff;
            font-weight: 700;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
        }

        .btn-back-home:hover {
            background: #0066FF;
            color: #fff;
            box-shadow: 0 0 15px rgba(0, 82, 255, 0.6);
        }

        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 50px 0 30px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }

        .footer-brand h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 8px;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .fab-left {
            position: fixed;
            left: 24px;
            bottom: 96px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.5rem;
            cursor: pointer;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.5);
            transition: all var(--transition-fast);
            animation: float-fab 3s ease-in-out infinite;
        }

        .fab-left::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50%;
            padding: 2px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            mask-composite: exclude;
            z-index: -1;
        }

        .fab-left:hover {
            transform: scale(1.1);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.8);
            color: #fff;
        }

        @keyframes float-fab {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-6px);
            }
        }

        @media screen and (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                position: static;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media screen and (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.active-mobile {
                display: flex;
            }
            .article-banner h1 {
                font-size: 1.8rem;
            }
            .article-main {
                padding: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .hero-grid {
                grid-template-columns: 1fr;
            }
        }

        @media screen and (max-width: 520px) {
            .article-banner {
                padding: 90px 0 40px;
            }
            .article-banner h1 {
                font-size: 1.5rem;
            }
            .nav-actions .btn-login {
                display: inline-block;
            }
            .nav-actions .btn-signup {
                display: inline-block;
                padding: 8px 16px;
                font-size: 0.8rem;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: #111827;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border-color: #1E293B;
            --border-glow: rgba(0, 240, 255, 0.3);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.4);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-primary);
            font-family: var(--font-main);
            line-height: 1.65;
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--accent-cyan);
        }

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

        button,
        .button {
            cursor: pointer;
            font-family: var(--font-main);
            border: none;
            outline: none;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            transition: background var(--transition-fast);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 20px;
            max-width: 1280px;
            margin: 0 auto;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

        .logo i {
            color: var(--accent-cyan);
            font-size: 1.4rem;
            text-shadow: var(--shadow-neon);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links li {
            margin: 0;
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 6px 0;
            transition: color var(--transition-fast);
            display: inline-block;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            transition: width var(--transition-fast);
            border-radius: 2px;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-primary);
        }

        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            background: transparent;
        }

        .btn-login:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 12px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-fast);
            display: inline-block;
        }

        .btn-signup:hover {
            box-shadow: 0 0 20px rgba(0, 82, 255, 0.7);
            transform: translateY(-1px);
            color: #fff;
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            cursor: pointer;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 60px;
            left: 0;
            width: 100%;
            background: rgba(8, 9, 15, 0.98);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            padding: 20px;
            z-index: 999;
            flex-direction: column;
            gap: 16px;
        }

        .mobile-menu a {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-secondary);
            padding: 8px 0;
            display: block;
        }

        .mobile-menu a.active {
            color: var(--accent-cyan);
        }

        .hero-section {
            padding: 140px 0 80px;
            background: radial-gradient(ellipse at 25% 30%, rgba(0, 82, 255, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 75% 70%, rgba(0, 240, 255, 0.06) 0%, transparent 55%),
                var(--bg-primary);
            border-bottom: 1px solid var(--border-color);
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .hero-text {
            text-align: left;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.25);
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-bottom: 24px;
        }

        .hero-badge i {
            animation: pulse-dot 1.8s infinite;
            font-size: 0.6rem;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.3; }
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 32px;
        }

        .hero-stats {
            display: flex;
            gap: 30px;
            margin-bottom: 32px;
        }

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

        .stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-cyan);
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 28px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 16px rgba(0, 82, 255, 0.4);
            transition: all var(--transition-fast);
            display: inline-block;
        }

        .btn-primary:hover {
            box-shadow: 0 0 24px rgba(0, 82, 255, 0.7);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-outline {
            background: transparent;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 28px;
            border-radius: var(--radius-sm);
            border: 2px solid var(--border-color);
            transition: all var(--transition-fast);
            display: inline-block;
        }

        .btn-outline:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.2);
        }

        .hero-image-wrapper {
            position: relative;
        }

        .hero-image-wrapper img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
        }

        .content-section {
            padding: 80px 0;
        }

        .content-section.alt-bg {
            background: var(--bg-secondary);
        }

        .section-label {
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--accent-cyan);
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--text-primary);
            text-align: left;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 40px;
            max-width: 800px;
            text-align: left;
        }

        .guide-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .guide-content {
            text-align: left;
        }

        .guide-list {
            list-style: none;
            padding: 0;
            margin: 0 0 30px;
        }

        .guide-list li {
            display: flex;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid var(--border-color);
            align-items: flex-start;
        }

        .guide-list li:last-child {
            border-bottom: none;
        }

        .guide-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1rem;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .guide-text strong {
            display: block;
            color: var(--text-primary);
            font-size: 1rem;
            margin-bottom: 4px;
        }

        .guide-text span {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.5;
        }

        .guide-image img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
        }

        .steps-flow {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            margin-top: 20px;
        }

        .step-card {
            flex: 1;
            min-width: 220px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            position: relative;
            transition: all var(--transition-fast);
        }

        .step-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.15);
            transform: translateY(-4px);
        }

        .step-number {
            font-size: 3rem;
            font-weight: 800;
            color: rgba(0, 240, 255, 0.15);
            position: absolute;
            top: 12px;
            right: 20px;
            line-height: 1;
        }

        .step-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .step-card p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .checklist-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-top: 30px;
        }

        .checklist-item {
            display: flex;
            gap: 14px;
            padding: 18px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            align-items: flex-start;
            transition: all var(--transition-fast);
        }

        .checklist-item:hover {
            border-color: var(--accent-cyan);
        }

        .check-icon {
            color: #00E676;
            font-size: 1.2rem;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .check-content strong {
            display: block;
            color: var(--text-primary);
            font-size: 1rem;
            margin-bottom: 4px;
        }

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

        .faq-section {
            padding: 80px 0;
        }

        .faq-list {
            max-width: 850px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            overflow: hidden;
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            border-color: var(--accent-cyan);
        }

        .faq-question {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-primary);
            user-select: none;
        }

        .faq-question i {
            color: var(--accent-cyan);
            transition: transform var(--transition-fast);
            font-size: 1rem;
        }

        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.65;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        .faq-item.open .faq-question i {
            transform: rotate(45deg);
        }

        .cta-section {
            padding: 80px 0;
            background: radial-gradient(ellipse at 50% 50%, rgba(0, 82, 255, 0.2) 0%, transparent 70%),
                var(--bg-primary);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            text-align: center;
        }

        .cta-box {
            background: var(--bg-card);
            border: 2px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            max-width: 650px;
            margin: 0 auto;
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.15);
        }

        .cta-box h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .cta-box p {
            font-size: 1.05rem;
            color: var(--text-muted);
            margin-bottom: 28px;
            line-height: 1.6;
        }

        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            font-size: 0.85rem;
            color: var(--text-muted);
            text-align: center;
            line-height: 1.6;
        }

        .fab {
            position: fixed;
            left: 16px;
            bottom: 80px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50px;
            background: rgba(13, 17, 30, 0.85);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
            opacity: 0.7;
            animation: float-fab 3s ease-in-out infinite;
        }

        .fab::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50px;
            background: linear-gradient(135deg, #00F0FF, #0052FF);
            z-index: -1;
            opacity: 0.6;
        }

        .fab i {
            font-size: 1.4rem;
            color: #fff;
            z-index: 1;
        }

        .fab:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 24px rgba(0, 240, 255, 0.7);
        }

        .fab:active {
            transform: scale(0.95);
        }

        @keyframes float-fab {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-6px); }
        }

        @media screen and (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .hero-title {
                font-size: 2.2rem;
            }

            .guide-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }

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

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

            .section-title {
                font-size: 1.7rem;
            }

            .steps-flow {
                gap: 16px;
            }

            .step-card {
                min-width: 180px;
            }
        }

        @media screen and (max-width: 768px) {
            .nav-links {
                display: none;
            }

            .nav-actions .btn-login,
            .nav-actions .btn-signup {
                display: inline-flex;
            }

            .mobile-toggle {
                display: block;
            }

            .hero-section {
                padding: 100px 0 50px;
            }

            .hero-title {
                font-size: 1.8rem;
            }

            .hero-stats {
                flex-direction: column;
                gap: 20px;
            }

            .hero-actions {
                flex-direction: column;
            }

            .btn-primary,
            .btn-outline {
                width: 100%;
                text-align: center;
            }

            .content-section {
                padding: 50px 0;
            }

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

            .steps-flow {
                flex-direction: column;
            }

            .step-card {
                min-width: 100%;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .cta-box {
                padding: 30px 20px;
            }

            .cta-box h2 {
                font-size: 1.5rem;
            }

            .fab {
                width: 48px;
                height: 48px;
                left: 12px;
                bottom: 60px;
            }

            .fab i {
                font-size: 1.2rem;
            }
        }

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

            .hero-desc {
                font-size: 0.95rem;
            }

            .section-title {
                font-size: 1.3rem;
            }

            .stat-number {
                font-size: 1.5rem;
            }

            .guide-list li {
                flex-direction: column;
                gap: 8px;
            }

            .checklist-item {
                flex-direction: column;
                gap: 8px;
            }
        }