/* roulang page: index */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.75);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #8892B0;
            --border-subtle: rgba(0, 82, 255, 0.25);
            --border-glow: rgba(0, 240, 255, 0.4);
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.6);
            --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.15);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --font-heading: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --font-body: 'Inter', system-ui, -apple-system, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        a:hover,
        a:focus-visible {
            color: var(--accent-blue);
            outline: none;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
        }

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

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 100;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
        }

        .site-header.scrolled {
            background: rgba(8, 9, 15, 0.95);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .logo {
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
        }

        .logo i {
            color: var(--accent-cyan);
            font-size: 1.5rem;
            filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.5));
        }

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

        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
        }

        .nav-links a {
            display: inline-block;
            padding: 10px 18px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            position: relative;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.08);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
            box-shadow: 0 0 10px var(--accent-cyan);
        }

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

        .btn-login {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-primary);
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all var(--transition-fast);
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.05);
        }

        .btn-signup {
            font-weight: 700;
            font-size: 0.9rem;
            color: #fff;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent-blue), #0066ff);
            box-shadow: 0 4px 16px rgba(0, 82, 255, 0.35);
            transition: all var(--transition-fast);
        }

        .btn-signup:hover {
            background: linear-gradient(135deg, #0066ff, var(--accent-blue));
            box-shadow: 0 6px 24px rgba(0, 82, 255, 0.5);
            transform: translateY(-1px);
        }

        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            background: none;
            border: none;
            cursor: pointer;
        }

        /* Hero */
        .hero-section {
            padding: 140px 0 80px;
            background: radial-gradient(ellipse at 30% top, rgba(0, 82, 255, 0.18) 0%, transparent 60%),
                radial-gradient(ellipse at 70% bottom, rgba(0, 240, 255, 0.08) 0%, transparent 50%),
                var(--bg-primary);
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            pointer-events: none;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 1;
        }

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

        .hero-badge {
            display: inline-block;
            padding: 6px 18px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-bottom: 24px;
            letter-spacing: 0.03em;
        }

        .hero-content h1 {
            font-family: var(--font-heading);
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--text-primary);
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }

        .hero-content h1 span {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 520px;
        }

        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent-blue), #0066ff);
            color: #fff;
            box-shadow: 0 6px 28px rgba(0, 82, 255, 0.45);
            transition: all var(--transition-smooth);
            text-decoration: none;
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, #0066ff, var(--accent-blue));
            box-shadow: 0 8px 32px rgba(0, 82, 255, 0.6);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-outline-glow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            background: transparent;
            color: var(--accent-cyan);
            border: 1.5px solid var(--accent-cyan);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.2);
            transition: all var(--transition-smooth);
            text-decoration: none;
        }

        .btn-outline-glow:hover {
            background: rgba(0, 240, 255, 0.08);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.4);
            transform: translateY(-2px);
            color: var(--accent-cyan);
        }

        .hero-stats {
            display: flex;
            gap: 32px;
            margin-top: 36px;
            padding-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

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

        .hero-stat-number {
            font-family: var(--font-heading);
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-cyan);
            line-height: 1;
        }

        .hero-stat-label {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 6px;
        }

        .hero-visual {
            position: relative;
        }

        .hero-visual-card {
            background: rgba(13, 17, 30, 0.7);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-card), var(--shadow-glow);
            position: relative;
        }

        .hero-visual-card img {
            border-radius: var(--radius-md);
            width: 100%;
            object-fit: cover;
            aspect-ratio: 16/10;
        }

        .hero-floating-tag {
            position: absolute;
            top: -16px;
            right: -12px;
            background: linear-gradient(135deg, #FF4500, #FF0000);
            color: #fff;
            font-weight: 700;
            font-size: 0.8rem;
            padding: 8px 16px;
            border-radius: 50px;
            box-shadow: 0 4px 16px rgba(255, 69, 0, 0.5);
            animation: floatTag 3s ease-in-out infinite;
        }

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

        /* Sections */
        .section {
            padding: 80px 0;
        }

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

        .section-header {
            text-align: left;
            margin-bottom: 48px;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--accent-cyan);
            margin-bottom: 12px;
        }

        .section-header h2 {
            font-family: var(--font-heading);
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }

        .section-header p {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 600px;
        }

        /* Commission Highlights */
        .commission-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

        .commission-card {
            background: var(--bg-card);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: left;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .commission-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(180deg, var(--accent-cyan), var(--accent-blue));
            border-radius: 4px 0 0 4px;
        }

        .commission-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 36px rgba(0, 0, 0, 0.5), 0 0 24px rgba(0, 240, 255, 0.12);
            border-color: var(--border-glow);
        }

        .commission-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(0, 82, 255, 0.1));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent-cyan);
            margin-bottom: 18px;
        }

        .commission-card h3 {
            font-family: var(--font-heading);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .commission-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .commission-value {
            display: inline-block;
            margin-top: 14px;
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--accent-cyan);
        }

        /* Promo Materials */
        .materials-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: start;
        }

        .material-card {
            background: var(--bg-card);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px;
            display: flex;
            gap: 20px;
            align-items: flex-start;
            transition: all var(--transition-smooth);
        }

        .material-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }

        .material-thumb {
            flex-shrink: 0;
            width: 100px;
            height: 100px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .material-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .material-info h3 {
            font-family: var(--font-heading);
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .material-info p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }

        .material-info .btn-sm {
            font-size: 0.8rem;
            font-weight: 700;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            background: rgba(0, 240, 255, 0.1);
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 240, 255, 0.3);
            transition: all var(--transition-fast);
            text-decoration: none;
            display: inline-block;
        }

        .material-info .btn-sm:hover {
            background: rgba(0, 240, 255, 0.2);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        /* News Section */
        .news-layout {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 40px;
            align-items: start;
        }

        .news-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .news-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            padding-bottom: 14px;
        }

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

        .news-item a {
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            display: block;
            transition: color var(--transition-fast);
            line-height: 1.4;
        }

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

        .news-meta {
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .news-sidebar-card {
            background: var(--bg-card);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px;
        }

        .news-sidebar-card h3 {
            font-family: var(--font-heading);
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--accent-cyan);
        }

        .news-sidebar-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .news-sidebar-card img {
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
        }

        /* Join Entry */
        .join-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.12), rgba(0, 240, 255, 0.06));
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
            padding: 80px 0;
            text-align: center;
        }

        .join-section h2 {
            font-family: var(--font-heading);
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .join-section p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto 32px;
        }

        .join-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* Featured Zones */
        .zones-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
        }

        .zone-card {
            background: var(--bg-card);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            text-align: left;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .zone-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            border-color: var(--border-glow);
        }

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

        .zone-card h3 {
            font-family: var(--font-heading);
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .zone-card p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .zone-card .zone-link {
            display: inline-block;
            margin-top: 14px;
            font-weight: 700;
            font-size: 0.85rem;
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        .zone-card .zone-link:hover {
            color: #fff;
        }

        /* Media Scroll */
        .media-scroll-wrapper {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            padding-bottom: 12px;
        }

        .media-scroll-track {
            display: flex;
            gap: 20px;
            min-width: max-content;
        }

        .media-card {
            flex-shrink: 0;
            width: 280px;
            background: var(--bg-card);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-smooth);
        }

        .media-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }

        .media-card img {
            width: 100%;
            height: 160px;
            object-fit: cover;
        }

        .media-card-body {
            padding: 16px;
        }

        .media-card-body h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text-primary);
        }

        .media-card-body p {
            font-size: 0.8rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        .media-scroll-wrapper::-webkit-scrollbar {
            height: 6px;
        }

        .media-scroll-wrapper::-webkit-scrollbar-track {
            background: rgba(255, 255, 255, 0.03);
            border-radius: 3px;
        }

        .media-scroll-wrapper::-webkit-scrollbar-thumb {
            background: rgba(0, 240, 255, 0.3);
            border-radius: 3px;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 20px;
            bottom: 96px;
            z-index: 90;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(13, 17, 30, 0.8);
            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;
            font-size: 1.5rem;
            color: var(--accent-cyan);
            cursor: pointer;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.35), 0 4px 16px rgba(0, 0, 0, 0.5);
            transition: all var(--transition-smooth);
            animation: fabPulse 2.5s ease-in-out infinite;
        }

        .fab-left::before {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: 50%;
            padding: 3px;
            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: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            pointer-events: none;
        }

        .fab-left:hover {
            transform: scale(1.15);
            box-shadow: 0 0 36px rgba(0, 240, 255, 0.6), 0 8px 28px rgba(0, 0, 0, 0.6);
            color: #fff;
        }

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

        @keyframes fabPulse {
            0%,
            100% {
                box-shadow: 0 0 20px rgba(0, 240, 255, 0.35), 0 4px 16px rgba(0, 0, 0, 0.5);
            }
            50% {
                box-shadow: 0 0 32px rgba(0, 240, 255, 0.55), 0 4px 20px rgba(0, 0, 0, 0.5);
            }
        }

        .fab-notification {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 14px;
            height: 14px;
            background: #FF007F;
            border-radius: 50%;
            animation: blink 1.2s ease-in-out infinite;
            box-shadow: 0 0 10px #FF007F;
        }

        @keyframes blink {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.3;
            }
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-subtle);
            padding: 48px 0 32px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-col h4 {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col a {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .footer-badges {
            display: flex;
            gap: 14px;
            font-size: 1.4rem;
            color: var(--text-muted);
        }

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

            .hero-content h1 {
                font-size: 2.2rem;
            }

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

            .news-layout {
                grid-template-columns: 1fr;
            }

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

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 20px;
                border-bottom: 1px solid var(--border-subtle);
                gap: 4px;
            }

            .nav-links.open {
                display: flex;
            }

            .mobile-toggle {
                display: block;
            }

            .header-actions {
                gap: 8px;
            }

            .btn-login,
            .btn-signup {
                padding: 8px 16px;
                font-size: 0.8rem;
            }

            .hero-content h1 {
                font-size: 1.8rem;
            }

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

            .section-header h2 {
                font-size: 1.6rem;
            }

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

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

            .media-card {
                width: 240px;
            }

            .fab-left {
                width: 48px;
                height: 48px;
                left: 14px;
                bottom: 80px;
                font-size: 1.3rem;
            }
        }

        @media (max-width: 520px) {
            .hero-section {
                padding: 120px 0 50px;
            }

            .hero-content h1 {
                font-size: 1.5rem;
            }

            .hero-cta-group {
                flex-direction: column;
                align-items: stretch;
            }

            .btn-primary,
            .btn-outline-glow {
                justify-content: center;
                text-align: center;
            }

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

            .join-buttons {
                flex-direction: column;
                align-items: stretch;
            }

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

            .header-inner {
                height: 56px;
            }

            .logo {
                font-size: 1rem;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.7);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.4);
            --border-subtle: rgba(255,255,255,0.08);
            --shadow-glow: 0 0 20px rgba(0, 82, 255, 0.3), 0 0 40px rgba(0, 240, 255, 0.1);
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition-speed: 0.25s;
            --font-heading: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
            --font-body: 'Inter', 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 100;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            transition: background var(--transition-speed) ease;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }

        .logo {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.25rem;
            letter-spacing: -0.02em;
            color: var(--text-primary);
            white-space: nowrap;
            background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-links {
            list-style: none;
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 0.3rem 0;
            transition: color var(--transition-speed) ease;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            transition: width var(--transition-speed) ease;
        }

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

        .btn-login {
            background: transparent;
            border: none;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 0.6rem 1.2rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-speed) ease;
        }

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

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue) 0%, #0040CC 100%);
            border: none;
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 0.6rem 1.5rem;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.5);
            transition: all var(--transition-speed) ease;
        }

        .btn-signup:hover {
            box-shadow: 0 0 22px rgba(0, 240, 255, 0.7);
            transform: translateY(-1px);
        }

        .mobile-toggle {
            display: none;
            background: transparent;
            border: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            cursor: pointer;
            padding: 0.4rem;
        }

        @media (max-width: 1024px) {
            .nav-links {
                gap: 1.5rem;
            }
        }

        @media (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            .nav-links {
                position: absolute;
                top: 68px;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: flex-start;
                padding: 1.5rem;
                gap: 1.2rem;
                display: none;
                border-bottom: 1px solid var(--border-subtle);
            }
            .nav-links.show {
                display: flex;
            }
            .nav-auth {
                display: flex;
            }
        }

        /* Page Hero */
        .page-hero {
            padding: 140px 0 80px;
            background: radial-gradient(ellipse at 20% 30%, rgba(0, 82, 255, 0.15) 0%, transparent 60%),
                        radial-gradient(ellipse at 80% 70%, rgba(0, 240, 255, 0.1) 0%, transparent 60%);
            text-align: left;
        }

        .page-hero-content {
            display: flex;
            flex-direction: column;
            gap: 2rem;
            max-width: 800px;
        }

        .page-hero h1 {
            font-family: var(--font-heading);
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-hero .hero-sub {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 650px;
        }

        .btn-primary-glow {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border: none;
            color: #08090F;
            font-weight: 700;
            font-size: 1rem;
            padding: 0.85rem 2rem;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-glow);
            transition: all 0.3s ease;
            align-self: flex-start;
        }

        .btn-primary-glow:hover {
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.6), 0 0 60px rgba(0, 82, 255, 0.4);
            transform: translateY(-2px);
        }

        /* Narrative Flow Sections */
        .section-block {
            padding: 5rem 0;
        }

        .section-block.alt-bg {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: #FFFFFF;
            letter-spacing: -0.02em;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 2.5rem;
            max-width: 700px;
        }

        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-speed) ease;
            box-shadow: var(--shadow-card);
        }

        .glass-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow), var(--shadow-card);
            transform: translateY(-4px);
        }

        .problem-list {
            list-style: none;
            display: grid;
            gap: 1.2rem;
        }

        .problem-list li {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            padding: 1.2rem;
            background: rgba(255, 255, 255, 0.02);
            border-radius: var(--radius-md);
            border-left: 3px solid #FF4500;
        }

        .problem-list li i {
            color: #FF4500;
            font-size: 1.2rem;
            margin-top: 0.2rem;
        }

        .solution-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.8rem;
        }

        .step-timeline {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }

        .step-item {
            display: flex;
            gap: 1.5rem;
            align-items: flex-start;
        }

        .step-num {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.3rem;
            color: #08090F;
            flex-shrink: 0;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
        }

        .step-body h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
        }

        .step-body p {
            color: var(--text-secondary);
        }

        .testimonial-card {
            background: linear-gradient(145deg, rgba(0,82,255,0.1) 0%, rgba(0,240,255,0.05) 100%);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 2rem;
            box-shadow: var(--shadow-card);
        }

        .testimonial-text {
            font-style: italic;
            font-size: 1.1rem;
            color: var(--text-primary);
            margin-bottom: 1rem;
        }

        .testimonial-author {
            font-weight: 700;
            color: var(--accent-cyan);
        }

        .badge-platform {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: 50px;
            padding: 0.3rem 1rem;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent-cyan);
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            gap: 1rem;
            max-width: 900px;
        }

        .faq-item {
            background: var(--bg-card);
            backdrop-filter: blur(8px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            cursor: pointer;
            transition: all var(--transition-speed) ease;
        }

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

        .faq-q {
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-a {
            margin-top: 1rem;
            color: var(--text-secondary);
            display: none;
        }

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

        /* CTA */
        .cta-block {
            background: linear-gradient(135deg, rgba(0,82,255,0.2) 0%, rgba(0,240,255,0.08) 100%);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            padding: 3rem 2rem;
            text-align: left;
        }

        .cta-block h2 {
            font-size: 2rem;
            font-weight: 800;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 1.2rem;
            bottom: 6rem;
            z-index: 90;
            width: 56px;
            height: 56px;
            background: rgba(8, 9, 15, 0.75);
            backdrop-filter: blur(14px);
            border: 2px solid transparent;
            background-clip: padding-box;
            border-radius: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.5);
            transition: all 0.3s ease;
            cursor: pointer;
            color: var(--accent-cyan);
            font-size: 1.4rem;
        }

        .fab-left::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50px;
            background: linear-gradient(135deg, #00F0FF, #0052FF);
            z-index: -1;
            opacity: 0.8;
        }

        .fab-left:hover {
            transform: scale(1.12);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.8);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-subtle);
            padding: 3rem 0 1.5rem;
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-col h4 {
            color: #FFFFFF;
            font-weight: 700;
            margin-bottom: 1rem;
            font-size: 1rem;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid var(--border-subtle);
            padding-top: 1.5rem;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .footer-badges {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        @media (max-width: 768px) {
            .page-hero h1 {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

/* roulang page: article */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #7C8798;
            --card-bg: rgba(13, 17, 30, 0.85);
            --card-border: rgba(0, 82, 255, 0.25);
            --glass-bg: rgba(8, 9, 15, 0.75);
            --glass-border: rgba(0, 240, 255, 0.20);
            --glow-cyan: 0 0 18px rgba(0, 240, 255, 0.45);
            --glow-blue: 0 0 22px rgba(0, 82, 255, 0.50);
            --radius-lg: 20px;
            --radius-md: 14px;
            --radius-sm: 10px;
            --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
            --font-body: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background: var(--primary-bg);
            color: var(--text-silver);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image: radial-gradient(circle at 25% 15%, rgba(0, 82, 255, 0.08) 0%, transparent 55%), radial-gradient(circle at 75% 85%, rgba(0, 240, 255, 0.06) 0%, transparent 55%);
            background-attachment: fixed;
            position: relative;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.18;
            z-index: -2;
            pointer-events: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: var(--font-heading);
            color: var(--text-white);
            line-height: 1.25;
            margin-bottom: 0.5rem;
            font-weight: 700;
        }

        h1 {
            font-size: clamp(2rem, 5vw, 2.8rem);
            letter-spacing: -0.5px;
            text-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
        }

        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.2rem);
            letter-spacing: -0.3px;
        }

        h3 {
            font-size: 1.25rem;
            font-weight: 600;
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: var(--transition-smooth);
        }

        a:hover {
            color: var(--text-white);
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.6);
        }

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

        button,
        .btn {
            cursor: pointer;
            font-family: var(--font-body);
            font-weight: 600;
            border: none;
            border-radius: var(--radius-sm);
            padding: 0.7rem 1.6rem;
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            font-size: 0.95rem;
            letter-spacing: 0.3px;
            text-decoration: none;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .section {
            padding: 3.5rem 0;
            position: relative;
        }

        .section-header {
            margin-bottom: 2.5rem;
            max-width: 750px;
        }

        .section-header.left {
            text-align: left;
            margin-left: 0;
            margin-right: auto;
        }

        .divider-glow {
            width: 70px;
            height: 4px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            border-radius: 2px;
            margin: 0.8rem 0 1.2rem;
            box-shadow: var(--glow-cyan);
        }

        .text-accent {
            color: var(--accent-cyan);
        }

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

        /* Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(8, 9, 15, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.12);
            box-shadow: 0 6px 25px rgba(0, 0, 0, 0.5);
            transition: var(--transition-smooth);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }

        .logo {
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-white);
            letter-spacing: -0.3px;
            display: flex;
            align-items: center;
            gap: 0.35rem;
            text-decoration: none;
            white-space: nowrap;
        }

        .logo i {
            color: var(--accent-cyan);
            font-size: 1.5rem;
            filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.7));
        }

        .logo:hover {
            color: var(--accent-cyan);
            text-shadow: 0 0 16px rgba(0, 240, 255, 0.55);
        }

        .nav-links {
            list-style: none;
            display: flex;
            align-items: center;
            gap: 1.8rem;
            margin: 0;
            flex-wrap: wrap;
        }

        .nav-links a {
            font-weight: 600;
            font-size: 0.92rem;
            color: var(--text-silver);
            padding: 0.3rem 0;
            position: relative;
            transition: var(--transition-smooth);
            white-space: nowrap;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -4px;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
            transition: width 0.25s ease;
            box-shadow: 0 0 10px var(--accent-cyan);
        }

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

        .nav-links a.active {
            color: var(--accent-cyan);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 0.9rem;
        }

        .btn-login {
            background: transparent;
            color: var(--text-silver);
            border: 1px solid rgba(255, 255, 255, 0.25);
            padding: 0.5rem 1.3rem;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.88rem;
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--text-white);
            box-shadow: 0 0 14px rgba(0, 240, 255, 0.3);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), #0066FF);
            color: #fff;
            padding: 0.5rem 1.5rem;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.88rem;
            box-shadow: 0 4px 18px rgba(0, 82, 255, 0.55);
            border: none;
        }

        .btn-signup:hover {
            box-shadow: 0 8px 28px rgba(0, 82, 255, 0.8);
            transform: translateY(-1px);
            color: #fff;
        }

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

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 68px;
                left: 0;
                width: 100%;
                background: rgba(13, 17, 30, 0.96);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 1.5rem;
                gap: 1.2rem;
                border-bottom: 2px solid rgba(0, 240, 255, 0.3);
            }

            .nav-links.show {
                display: flex;
            }

            .mobile-toggle {
                display: block;
            }

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

        /* Article Body */
        .article-container {
            max-width: 880px;
            margin: 2rem auto 0;
            background: var(--glass-bg);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 2.5rem 2rem;
            box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6);
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 1.2rem;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 1rem 0 2rem;
            padding-bottom: 1.2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
        }

        .category-tag {
            background: rgba(0, 82, 255, 0.25);
            color: var(--accent-cyan);
            padding: 0.25rem 0.9rem;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.82rem;
            border: 1px solid rgba(0, 240, 255, 0.35);
        }

        .article-body {
            font-size: 1.05rem;
            line-height: 1.75;
            word-wrap: break-word;
            color: var(--text-silver);
        }

        .article-body h2 {
            margin-top: 2rem;
            margin-bottom: 0.9rem;
            font-size: 1.5rem;
        }

        .article-body h3 {
            margin-top: 1.6rem;
            margin-bottom: 0.7rem;
        }

        .article-body p {
            margin-bottom: 1.3rem;
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.5rem 0;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .article-body a {
            font-weight: 600;
            text-decoration: underline;
            text-decoration-color: rgba(0, 240, 255, 0.4);
            text-underline-offset: 3px;
        }

        .not-found-card {
            text-align: center;
            padding: 4rem 2rem;
            background: var(--glass-bg);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(255, 255, 255, 0.12);
        }

        .not-found-card i {
            font-size: 3.5rem;
            color: var(--accent-cyan);
            margin-bottom: 1rem;
            opacity: 0.8;
        }

        .btn-back {
            margin-top: 1.5rem;
            background: linear-gradient(135deg, var(--accent-blue), #003DB3);
            color: #fff;
            padding: 0.7rem 2rem;
            border-radius: 30px;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
            box-shadow: 0 6px 18px rgba(0, 82, 255, 0.4);
            transition: var(--transition-smooth);
        }

        .btn-back:hover {
            box-shadow: 0 10px 28px rgba(0, 82, 255, 0.7);
            transform: translateY(-2px);
            color: #fff;
        }

        /* Related Section */
        .related-section {
            background: rgba(13, 17, 30, 0.5);
            backdrop-filter: blur(8px);
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            margin-top: 3rem;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.8rem;
            margin-top: 1.8rem;
        }

        .related-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition-smooth);
            backdrop-filter: blur(6px);
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--glow-cyan);
            transform: translateY(-4px);
        }

        .related-card img {
            width: 100%;
            height: 170px;
            object-fit: cover;
            border-bottom: 1px solid rgba(0, 240, 255, 0.2);
        }

        .related-card-body {
            padding: 1.2rem;
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .related-card-body h4 {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
        }

        .related-card-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 1rem;
        }

        .related-card-body a {
            font-weight: 600;
            color: var(--accent-cyan);
            align-self: flex-start;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }

        /* FAB */
        .fab-container {
            position: fixed;
            left: 1.2rem;
            bottom: 6rem;
            z-index: 50;
        }

        .fab-btn {
            width: 54px;
            height: 54px;
            border-radius: 28px;
            background: rgba(8, 9, 15, 0.78);
            backdrop-filter: blur(14px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.6rem;
            cursor: pointer;
            transition: var(--transition-smooth);
            position: relative;
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.4);
            animation: fabPulse 2.4s infinite;
        }

        .fab-btn::before {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: 32px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            z-index: -1;
            opacity: 0.7;
            filter: blur(6px);
        }

        .fab-btn:hover {
            transform: scale(1.08);
            box-shadow: 0 0 32px rgba(0, 240, 255, 0.75);
            color: #fff;
        }

        .fab-notification {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 14px;
            height: 14px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid #08090F;
            animation: blink 1.3s infinite;
        }

        @keyframes fabPulse {
            0%,
            100% {
                opacity: 0.7;
            }
            50% {
                opacity: 1;
            }
        }

        @keyframes blink {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.4;
            }
        }

        /* Footer */
        .site-footer {
            background: rgba(8, 9, 15, 0.9);
            backdrop-filter: blur(20px);
            border-top: 2px solid rgba(0, 82, 255, 0.2);
            padding: 2.5rem 0 1.5rem;
            margin-top: 2rem;
            color: var(--text-silver);
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-col h4 {
            color: var(--accent-cyan);
            font-size: 1rem;
            margin-bottom: 0.8rem;
            font-weight: 700;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
        }

        .footer-col li {
            margin-bottom: 0.4rem;
        }

        .footer-col a {
            color: var(--text-muted);
            font-size: 0.88rem;
        }

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

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            gap: 1rem;
        }

        .footer-badges {
            display: flex;
            align-items: center;
            gap: 1rem;
            font-size: 1.1rem;
            color: var(--accent-cyan);
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }
            .article-container {
                padding: 1.5rem 1rem;
            }
            .header-actions .btn-login {
                padding: 0.4rem 0.9rem;
                font-size: 0.8rem;
            }
            .header-actions .btn-signup {
                padding: 0.4rem 1rem;
                font-size: 0.8rem;
            }
            .fab-container {
                bottom: 5rem;
                left: 0.5rem;
            }
            .fab-btn {
                width: 46px;
                height: 46px;
                font-size: 1.3rem;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.7);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-green: #00FF88;
            --accent-gold: #FFD700;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-dim: #64748B;
            --border-color: rgba(0, 240, 255, 0.15);
            --border-glow: rgba(0, 240, 255, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.2);
            --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }

        * {
            box-sizing: border-box;
        }

        body {
            background: var(--bg-primary);
            color: var(--text-primary);
            font-family: 'Inter', 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
            position: relative;
            z-index: 1;
        }

        /* 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 var(--border-color);
            transition: var(--transition);
        }

        .site-header.scrolled {
            background: rgba(8, 9, 15, 0.95);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.6);
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            flex-wrap: wrap;
        }

        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            text-decoration: none;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
            max-width: 280px;
        }

        .logo:hover {
            filter: brightness(1.3);
        }

        .nav-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-links li a {
            display: inline-block;
            padding: 8px 18px;
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.9rem;
            border-radius: 50px;
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }

        .nav-links li a:hover,
        .nav-links li a.active {
            color: var(--text-primary);
            background: rgba(0, 240, 255, 0.1);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.15);
        }

        .nav-links li a.active {
            background: rgba(0, 82, 255, 0.25);
            border: 1px solid var(--accent-blue);
        }

        .nav-buttons {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-glow);
            padding: 9px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.85rem;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.08);
            box-shadow: var(--shadow-glow);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #000;
            border: none;
            padding: 10px 24px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.85rem;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
        }

        .btn-signup:hover {
            box-shadow: 0 8px 30px rgba(0, 240, 255, 0.6);
            transform: translateY(-2px);
        }

        .mobile-toggle {
            display: none;
            background: transparent;
            border: 1px solid var(--border-glow);
            color: var(--accent-cyan);
            font-size: 1.5rem;
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            cursor: pointer;
        }

        @media (max-width: 1024px) {
            .mobile-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: rgba(13, 17, 30, 0.98);
                backdrop-filter: blur(20px);
                padding: 10px 0;
                border-radius: var(--radius-md);
                margin-top: 10px;
                border: 1px solid var(--border-color);
            }
            .nav-links.show {
                display: flex;
            }
            .nav-links li a {
                padding: 12px 20px;
                border-radius: 0;
            }
            .nav-buttons {
                gap: 8px;
            }
            .btn-login,
            .btn-signup {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            .logo {
                font-size: 1rem;
                max-width: 220px;
            }
        }

        /* Hero */
        .hero-section {
            position: relative;
            min-height: 70vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            overflow: hidden;
            background: radial-gradient(ellipse at center, rgba(0, 82, 255, 0.15) 0%, transparent 70%);
            margin-top: 70px;
        }

        .hero-video-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 0;
            opacity: 0.3;
            filter: brightness(0.6) saturate(1.2);
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(180deg, rgba(8,9,15,0.7) 0%, rgba(8,9,15,0.9) 100%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: 40px 20px;
        }

        .hero-badge {
            display: inline-block;
            padding: 8px 20px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid var(--accent-cyan);
            border-radius: 50px;
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.85rem;
            margin-bottom: 20px;
            letter-spacing: 1px;
            text-transform: uppercase;
        }

        .hero-content h1 {
            font-size: clamp(2.2rem, 6vw, 3.8rem);
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #FFFFFF 0%, var(--accent-cyan) 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 30px;
            line-height: 1.7;
        }

        .hero-cta-group {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .btn-primary-glow {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #000;
            font-weight: 700;
            padding: 14px 36px;
            border-radius: 50px;
            font-size: 1rem;
            text-decoration: none;
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.5);
            transition: var(--transition);
            border: none;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .btn-primary-glow:hover {
            box-shadow: 0 0 45px rgba(0, 240, 255, 0.8);
            transform: translateY(-3px);
        }

        .btn-outline-glow {
            background: transparent;
            border: 2px solid var(--accent-cyan);
            color: var(--accent-cyan);
            font-weight: 600;
            padding: 14px 36px;
            border-radius: 50px;
            font-size: 1rem;
            text-decoration: none;
            transition: var(--transition);
        }

        .btn-outline-glow:hover {
            background: rgba(0, 240, 255, 0.1);
            box-shadow: var(--shadow-glow);
        }

        /* Promo Cards */
        .section-padding {
            padding: 80px 0;
        }

        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 15px;
            color: var(--text-primary);
            text-align: left;
        }

        .section-subtitle {
            color: var(--text-secondary);
            margin-bottom: 50px;
            font-size: 1.1rem;
            text-align: left;
            max-width: 700px;
        }

        .promo-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .promo-card {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 30px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .promo-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(180deg, var(--accent-cyan), var(--accent-blue));
            border-radius: 4px 0 0 4px;
        }

        .promo-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-5px);
        }

        .promo-tag {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 700;
            background: rgba(0, 255, 136, 0.15);
            color: var(--accent-green);
            border: 1px solid rgba(0, 255, 136, 0.3);
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }

        .promo-tag.hot {
            background: rgba(255, 70, 70, 0.2);
            color: #FF4650;
            border-color: rgba(255, 70, 70, 0.4);
        }

        .promo-tag.gold {
            background: rgba(255, 215, 0, 0.15);
            color: var(--accent-gold);
            border-color: rgba(255, 215, 0, 0.4);
        }

        .promo-card h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .promo-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .promo-highlight {
            font-size: 2rem;
            font-weight: 900;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin: 15px 0;
        }

        .btn-sm {
            display: inline-block;
            padding: 10px 24px;
            background: rgba(0, 240, 255, 0.15);
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.85rem;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-sm:hover {
            background: var(--accent-cyan);
            color: #000;
        }

        /* Pain Points */
        .pain-section {
            background: var(--bg-secondary);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            border: 1px solid var(--border-color);
        }

        .pain-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .pain-item {
            text-align: left;
            padding: 25px;
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.02);
            border-left: 3px solid #FF4650;
        }

        .pain-item.solved {
            border-left-color: var(--accent-green);
            background: rgba(0, 255, 136, 0.03);
        }

        .pain-item h4 {
            font-weight: 700;
            font-size: 1.15rem;
            margin-bottom: 8px;
        }

        /* Steps */
        .steps-container {
            display: flex;
            flex-direction: column;
            gap: 25px;
            margin-top: 30px;
        }

        .step-row {
            display: flex;
            align-items: flex-start;
            gap: 25px;
            padding: 30px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .step-row:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }

        .step-number {
            font-size: 3rem;
            font-weight: 900;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            min-width: 70px;
            line-height: 1;
        }

        .step-content h4 {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 6px;
        }

        .step-content p {
            color: var(--text-secondary);
            margin: 0;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
            margin-top: 30px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px 25px;
            cursor: pointer;
            transition: var(--transition);
            text-align: left;
        }

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

        .faq-question {
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-primary);
        }

        .faq-answer {
            color: var(--text-secondary);
            margin-top: 12px;
            display: none;
            font-size: 0.95rem;
            line-height: 1.7;
        }

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

        .faq-item.open {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-glow);
        }

        /* CTA */
        .cta-block {
            background: radial-gradient(circle at center, rgba(0, 82, 255, 0.25), transparent 80%);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 70px 30px;
            text-align: center;
            margin: 60px 0;
        }

        .cta-block h3 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 20px;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 50px 0 30px;
            margin-top: 60px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 30px;
            text-align: left;
        }

        .footer-col h4 {
            font-weight: 700;
            margin-bottom: 15px;
            color: var(--text-primary);
            font-size: 1rem;
        }

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

        .footer-col ul li {
            margin-bottom: 8px;
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        .footer-col ul li a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: var(--transition);
        }

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
            color: var(--text-dim);
            font-size: 0.85rem;
        }

        .footer-badges {
            display: flex;
            gap: 15px;
            align-items: center;
            color: var(--accent-green);
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 999;
            width: 56px;
            height: 56px;
            border-radius: 50px;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), linear-gradient(135deg, #00F0FF, #0052FF);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.6rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
        }

        .fab-left:hover {
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.7);
            transform: scale(1.08);
            color: #fff;
        }

        @media (max-width: 768px) {
            .hero-section {
                min-height: 60vh;
            }
            .section-padding {
                padding: 50px 0;
            }
            .promo-grid {
                grid-template-columns: 1fr;
            }
            .pain-section {
                padding: 30px 20px;
            }
        }