/* roulang page: index */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glass: rgba(0,240,255,0.2);
            --shadow-neon: 0 0 15px rgba(0,240,255,0.5);
            --shadow-azure: 0 4px 20px rgba(0,82,255,0.3);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', 'Inter', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
        }

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

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

        a { text-decoration: none; color: inherit; }
        ul { list-style: none; padding: 0; }
        img { max-width: 100%; height: auto; display: block; }

        h1, h2, h3, h4 { font-family: var(--font-heading); color: var(--text-white); letter-spacing: -0.02em; }

        .section-title {
            font-size: clamp(1.8rem, 3.5vw, 2.4rem);
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.65;
        }
        .text-neon { color: var(--accent-cyan); }

        /* Navbar */
        .navbar-main {
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0,240,255,0.12);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1050;
        }
        .navbar-brand-custom {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-white);
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-link-custom {
            color: var(--text-silver);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            margin: 0 0.1rem;
        }
        .nav-link-custom:hover, .nav-link-custom.active {
            color: var(--accent-cyan);
            background: rgba(0,240,255,0.08);
        }
        .btn-glass {
            background: rgba(0,240,255,0.1);
            border: 1px solid var(--border-glass);
            color: var(--accent-cyan);
            border-radius: 2rem;
            padding: 0.55rem 1.6rem;
            font-weight: 600;
            font-size: 0.9rem;
            backdrop-filter: blur(8px);
            transition: all var(--transition-fast);
        }
        .btn-glass:hover {
            background: rgba(0,240,255,0.2);
            box-shadow: var(--shadow-neon);
            color: var(--text-white);
        }
        .btn-neon {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            font-weight: 700;
            border-radius: 2rem;
            padding: 0.55rem 1.8rem;
            font-size: 0.9rem;
            box-shadow: var(--shadow-azure);
            transition: all var(--transition-fast);
        }
        .btn-neon:hover {
            background: #0040cc;
            box-shadow: 0 6px 25px rgba(0,82,255,0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .navbar-toggler {
            border: 1px solid rgba(0,240,255,0.3);
            padding: 0.4rem 0.6rem;
            border-radius: var(--radius-sm);
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,240,255,0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        @media (max-width: 991.98px) {
            .navbar-collapse { background: rgba(8,9,15,0.95); backdrop-filter: blur(20px); padding: 1rem; border-radius: var(--radius-md); margin-top: 0.5rem; }
        }

        /* Hero */
        .hero-section {
            background: linear-gradient(160deg, #08090F 0%, #0D111E 60%, #0A1424 100%);
            padding: 5rem 0 4.5rem;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-glass);
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -15%;
            right: -10%;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(0,240,255,0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-title {
            font-size: clamp(2.2rem, 5vw, 3.4rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.2rem;
        }
        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 560px;
            line-height: 1.65;
            margin-bottom: 2rem;
        }
        .hero-image-wrapper {
            background: rgba(0,240,255,0.03);
            border: 1px solid var(--border-glass);
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 40px rgba(0,0,0,0.4);
        }

        /* Glass cards */
        .glass-card {
            background: rgba(13, 17, 30, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-fast);
        }
        .glass-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-2px);
        }
        .icon-circle {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(0,240,255,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.4rem;
            margin-bottom: 1rem;
        }

        /* Process Steps */
        .step-number {
            font-size: 3rem;
            font-weight: 800;
            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;
        }

        .bg-card-deep {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
            padding: 1.5rem;
        }

        /* Reviews */
        .review-bubble {
            background: rgba(0,240,255,0.04);
            border-left: 4px solid var(--accent-cyan);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            padding: 1.3rem 1.5rem;
            position: relative;
        }
        .review-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, #0052FF, #00F0FF);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: #fff;
        }

        /* Hot list */
        .hot-card {
            background: var(--bg-card);
            border: 1px solid rgba(0,240,255,0.15);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-fast);
            height: 100%;
        }
        .hot-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-4px);
        }
        .hot-badge {
            background: var(--accent-blue);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 0.25rem 0.7rem;
            border-radius: 1rem;
            letter-spacing: 0.02em;
        }

        .faq-item {
            background: rgba(13,17,30,0.4);
            border: 1px solid rgba(255,255,255,0.05);
            border-radius: var(--radius-md);
            padding: 1.4rem 1.6rem;
            margin-bottom: 0.8rem;
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .faq-item:hover { border-color: var(--border-glass); }
        .faq-question {
            font-weight: 600;
            color: var(--text-white);
            font-size: 1.05rem;
        }
        .faq-answer {
            color: var(--text-muted);
            margin-top: 0.5rem;
            line-height: 1.6;
        }

        .news-list-item {
            border-bottom: 1px solid rgba(255,255,255,0.05);
            padding: 1rem 0;
            display: flex;
            gap: 1rem;
            align-items: center;
            transition: all var(--transition-fast);
        }
        .news-list-item:hover { background: rgba(0,240,255,0.03); border-radius: var(--radius-sm); padding-left: 0.5rem; }
        .news-date {
            font-size: 0.8rem;
            color: var(--accent-cyan);
            white-space: nowrap;
            font-weight: 500;
        }

        .footer-main {
            background: #06070A;
            border-top: 1px solid rgba(0,240,255,0.1);
            padding: 3rem 0 2rem;
            color: var(--text-muted);
        }
        .footer-brand {
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--text-white);
        }

        /* FAB */
        .fab-neon {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 1000;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8,9,15,0.75);
            backdrop-filter: blur(14px);
            border: 2px solid transparent;
            background-clip: padding-box;
            border-image: linear-gradient(135deg, #00F0FF, #0052FF) 1;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.4rem;
            box-shadow: 0 0 18px rgba(0,240,255,0.45);
            transition: all var(--transition-fast);
            cursor: pointer;
        }
        .fab-neon:hover {
            transform: scale(1.1);
            box-shadow: 0 0 28px rgba(0,240,255,0.7);
            color: #fff;
        }

        @media (max-width: 768px) {
            .hero-section { padding: 3.5rem 0 3rem; }
            .hero-title { font-size: 1.9rem; }
            .fab-neon { left: 1rem; bottom: 5rem; width: 48px; height: 48px; font-size: 1.2rem; }
        }

/* roulang page: article */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glass: rgba(0,240,255,0.2);
            --shadow-neon: 0 0 15px rgba(0,240,255,0.5);
            --shadow-azure: 0 4px 20px rgba(0,82,255,0.3);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', 'Inter', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
        }

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

        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; height: auto; display: block; }

        .section-title {
            font-size: clamp(1.8rem, 3.5vw, 2.4rem);
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-white);
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.65;
        }

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

        .navbar-main {
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0,240,255,0.12);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1050;
        }

        .navbar-brand-custom {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-white);
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-link-custom {
            color: var(--text-silver);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            margin: 0 0.1rem;
        }

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

        .btn-glass {
            background: rgba(0,240,255,0.1);
            border: 1px solid var(--border-glass);
            color: var(--accent-cyan);
            border-radius: 2rem;
            padding: 0.55rem 1.6rem;
            font-weight: 600;
            font-size: 0.9rem;
            backdrop-filter: blur(8px);
            transition: all var(--transition-fast);
        }

        .btn-glass:hover {
            background: rgba(0,240,255,0.2);
            box-shadow: var(--shadow-neon);
            color: var(--text-white);
        }

        .btn-neon {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            font-weight: 700;
            border-radius: 2rem;
            padding: 0.55rem 1.8rem;
            font-size: 0.9rem;
            box-shadow: var(--shadow-azure);
            transition: all var(--transition-fast);
        }

        .btn-neon:hover {
            background: #0040cc;
            box-shadow: 0 6px 25px rgba(0,82,255,0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .navbar-toggler {
            border: 1px solid rgba(0,240,255,0.3);
            padding: 0.4rem 0.6rem;
            border-radius: var(--radius-sm);
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,240,255,0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        .navbar-collapse { 
            background: rgba(8,9,15,0.95); 
            backdrop-filter: blur(20px); 
            padding: 1rem; 
            border-radius: var(--radius-md); 
            margin-top: 0.5rem; 
        }

        @media (min-width: 992px) {
            .navbar-collapse {
                background: transparent;
                backdrop-filter: none;
                padding: 0;
                border-radius: 0;
                margin-top: 0;
            }
        }

        .article-banner {
            background: linear-gradient(160deg, #08090F 0%, #0D111E 60%, #0A1424 100%);
            padding: 3rem 0 3rem;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-glass);
        }

        .article-banner::before {
            content: '';
            position: absolute;
            top: -15%;
            right: -10%;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(0,240,255,0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1rem;
            margin-top: 1rem;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .article-meta .badge-category {
            background: rgba(0,240,255,0.12);
            color: var(--accent-cyan);
            border: 1px solid rgba(0,240,255,0.25);
            padding: 0.4rem 1rem;
            border-radius: 2rem;
            font-weight: 600;
            font-size: 0.85rem;
        }

        .article-meta span i {
            margin-right: 0.3rem;
            color: var(--accent-blue);
        }

        .glass-card {
            background: rgba(13, 17, 30, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-fast);
        }

        .glass-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-2px);
        }

        .article-content {
            font-size: 1.05rem;
            line-height: 1.8;
            color: var(--text-silver);
        }

        .article-content h2 {
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--text-white);
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            border-left: 4px solid var(--accent-cyan);
            padding-left: 1rem;
        }

        .article-content h3 {
            font-size: 1.35rem;
            font-weight: 650;
            color: var(--accent-cyan);
            margin-top: 2rem;
            margin-bottom: 0.75rem;
        }

        .article-content p {
            margin-bottom: 1.2rem;
        }

        .article-content ul, .article-content ol {
            margin-bottom: 1.5rem;
            padding-left: 1.5rem;
        }

        .article-content li {
            margin-bottom: 0.5rem;
        }

        .article-content strong {
            color: var(--text-white);
            font-weight: 650;
        }

        .article-content blockquote {
            background: rgba(0,240,255,0.05);
            border-left: 4px solid var(--accent-blue);
            padding: 1.25rem 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-silver);
            font-style: italic;
        }

        .cta-inline-box {
            background: linear-gradient(135deg, rgba(0,82,255,0.15), rgba(0,240,255,0.08));
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            margin: 2.5rem 0;
            text-align: left;
        }

        .cta-inline-box h4 {
            color: var(--text-white);
            font-weight: 700;
            margin-bottom: 0.75rem;
        }

        .cta-inline-box p {
            color: var(--text-muted);
            margin-bottom: 1.25rem;
        }

        .btn-neon-lg {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            font-weight: 700;
            border-radius: 2rem;
            padding: 0.75rem 2.2rem;
            font-size: 1rem;
            box-shadow: var(--shadow-azure);
            transition: all var(--transition-fast);
            display: inline-block;
        }

        .btn-neon-lg:hover {
            background: #0040cc;
            box-shadow: 0 8px 30px rgba(0,82,255,0.6);
            transform: translateY(-2px);
            color: #fff;
        }

        .related-articles {
            margin-top: 4rem;
            padding-top: 2.5rem;
            border-top: 1px solid var(--border-glass);
        }

        .related-card {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
            height: 100%;
        }

        .related-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-3px);
        }

        .related-card img {
            height: 180px;
            object-fit: cover;
            width: 100%;
        }

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

        .related-card h5 {
            font-size: 1.05rem;
            font-weight: 650;
            color: var(--text-white);
            margin-bottom: 0.5rem;
            line-height: 1.4;
        }

        .related-card .text-muted-small {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .footer-main {
            background: var(--bg-card);
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 3rem 0 2rem;
            margin-top: 4rem;
            color: var(--text-muted);
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.3rem;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .footer-main a.text-muted:hover {
            color: var(--accent-cyan) !important;
        }

        .footer-main h6 {
            font-weight: 700;
            font-size: 0.95rem;
        }

        @media (max-width: 768px) {
            .article-banner {
                padding: 2rem 0 2rem;
            }
            .related-card img {
                height: 140px;
            }
        }

/* roulang page: category1 */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glass: rgba(0,240,255,0.2);
            --shadow-neon: 0 0 15px rgba(0,240,255,0.5);
            --shadow-azure: 0 4px 20px rgba(0,82,255,0.3);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', 'Inter', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        body {
            background-color: var(--bg-deep);
            color: var(--text-silver);
            font-family: var(--font-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }

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

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

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            font-weight: 700;
            color: var(--text-white);
            line-height: 1.3;
        }

        .section-title {
            font-size: clamp(1.8rem, 3.5vw, 2.4rem);
            font-weight: 700;
            margin-bottom: 1rem;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.65;
        }

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

        .container {
            max-width: 1200px;
            padding-left: 1rem;
            padding-right: 1rem;
            margin-left: auto;
            margin-right: auto;
        }

        .navbar-main {
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0,240,255,0.12);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1050;
        }

        .navbar-brand-custom {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-white);
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-link-custom {
            color: var(--text-silver);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            margin: 0 0.1rem;
        }

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

        .btn-glass {
            background: rgba(0,240,255,0.1);
            border: 1px solid var(--border-glass);
            color: var(--accent-cyan);
            border-radius: 2rem;
            padding: 0.55rem 1.6rem;
            font-weight: 600;
            font-size: 0.9rem;
            backdrop-filter: blur(8px);
            transition: all var(--transition-fast);
            cursor: pointer;
            display: inline-block;
            text-align: center;
        }

        .btn-glass:hover {
            background: rgba(0,240,255,0.2);
            box-shadow: var(--shadow-neon);
            color: var(--text-white);
        }

        .btn-neon {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            font-weight: 700;
            border-radius: 2rem;
            padding: 0.55rem 1.8rem;
            font-size: 0.9rem;
            box-shadow: var(--shadow-azure);
            transition: all var(--transition-fast);
            cursor: pointer;
            display: inline-block;
            text-align: center;
        }

        .btn-neon:hover {
            background: #0040cc;
            box-shadow: 0 6px 25px rgba(0,82,255,0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .navbar-toggler {
            border: 1px solid rgba(0,240,255,0.3);
            padding: 0.4rem 0.6rem;
            border-radius: var(--radius-sm);
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,240,255,0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        .navbar-collapse {
            background: rgba(8,9,15,0.95);
            backdrop-filter: blur(20px);
            padding: 1rem;
            border-radius: var(--radius-md);
            margin-top: 0.5rem;
        }

        @media (min-width: 992px) {
            .navbar-collapse {
                background: transparent;
                backdrop-filter: none;
                padding: 0;
                margin-top: 0;
                border-radius: 0;
            }
        }

        .hero-section {
            background: linear-gradient(160deg, #08090F 0%, #0D111E 60%, #0A1424 100%);
            padding: 5rem 0 4.5rem;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-glass);
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -15%;
            right: -10%;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(0,240,255,0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-title {
            font-size: clamp(2.2rem, 5vw, 3.4rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.2rem;
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 560px;
            line-height: 1.65;
            margin-bottom: 2rem;
        }

        .hero-image-wrapper {
            background: rgba(0,240,255,0.03);
            border: 1px solid var(--border-glass);
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 40px rgba(0,0,0,0.4);
            position: relative;
        }

        .glass-card {
            background: rgba(13, 17, 30, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-fast);
            height: 100%;
        }

        .glass-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-2px);
        }

        .bg-card-deep {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
            padding: 2rem;
        }

        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.1;
        }

        .process-step {
            background: rgba(0,240,255,0.05);
            border-left: 3px solid var(--accent-cyan);
            padding: 1.5rem;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            transition: all var(--transition-fast);
        }

        .process-step:hover {
            background: rgba(0,240,255,0.1);
        }

        .process-step-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-cyan);
            line-height: 1;
            margin-bottom: 0.5rem;
        }

        .fab-custom {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            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-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;
            cursor: pointer;
            box-shadow: 0 0 20px rgba(0,240,255,0.4);
            transition: all var(--transition-fast);
            animation: float 3s ease-in-out infinite;
        }

        .fab-custom:hover {
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(0,240,255,0.7);
        }

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

        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-8px); }
        }

        .fab-custom i {
            color: var(--accent-cyan);
            font-size: 1.5rem;
        }

        .footer-main {
            background: var(--bg-deep);
            border-top: 1px solid var(--border-glass);
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.2rem;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .footer-main a.text-muted:hover {
            color: var(--accent-cyan) !important;
            transition: color var(--transition-fast);
        }

        @media (max-width: 768px) {
            .hero-section {
                padding: 3rem 0 2.5rem;
            }
            .glass-card {
                padding: 1.5rem;
            }
            .fab-custom {
                width: 48px;
                height: 48px;
                left: 0.75rem;
                bottom: 5rem;
            }
        }

        @media (max-width: 520px) {
            .hero-title {
                font-size: 2rem;
            }
            .stat-number {
                font-size: 2.2rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glass: rgba(0,240,255,0.2);
            --shadow-neon: 0 0 15px rgba(0,240,255,0.5);
            --shadow-azure: 0 4px 20px rgba(0,82,255,0.3);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', 'Inter', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        body {
            background-color: var(--bg-deep);
            color: var(--text-silver);
            font-family: var(--font-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }

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

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

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            font-weight: 700;
            color: var(--text-white);
            line-height: 1.3;
        }

        .section-title {
            font-size: clamp(1.8rem, 3.5vw, 2.4rem);
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-white);
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.65;
        }

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

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

        /* Navbar */
        .navbar-main {
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0,240,255,0.12);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1050;
        }

        .navbar-brand-custom {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-white);
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-link-custom {
            color: var(--text-silver);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            margin: 0 0.1rem;
        }

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

        .btn-glass {
            background: rgba(0,240,255,0.1);
            border: 1px solid var(--border-glass);
            color: var(--accent-cyan);
            border-radius: 2rem;
            padding: 0.55rem 1.6rem;
            font-weight: 600;
            font-size: 0.9rem;
            backdrop-filter: blur(8px);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .btn-glass:hover {
            background: rgba(0,240,255,0.2);
            box-shadow: var(--shadow-neon);
            color: var(--text-white);
        }

        .btn-neon {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            font-weight: 700;
            border-radius: 2rem;
            padding: 0.55rem 1.8rem;
            font-size: 0.9rem;
            box-shadow: var(--shadow-azure);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .btn-neon:hover {
            background: #0040cc;
            box-shadow: 0 6px 25px rgba(0,82,255,0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .navbar-toggler {
            border: 1px solid rgba(0,240,255,0.3);
            padding: 0.4rem 0.6rem;
            border-radius: var(--radius-sm);
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,240,255,0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        .navbar-collapse {
            background: rgba(8,9,15,0.95);
            backdrop-filter: blur(20px);
            padding: 1rem;
            border-radius: var(--radius-md);
            margin-top: 0.5rem;
        }

        /* Hero */
        .hero-section {
            background: linear-gradient(160deg, #08090F 0%, #0D111E 60%, #0A1424 100%);
            padding: 5rem 0 4.5rem;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-glass);
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -15%;
            right: -10%;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(0,240,255,0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-title {
            font-size: clamp(2.2rem, 5vw, 3.4rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.2rem;
            color: var(--text-white);
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 560px;
            line-height: 1.65;
            margin-bottom: 2rem;
        }

        .hero-image-wrapper {
            background: rgba(0,240,255,0.03);
            border: 1px solid var(--border-glass);
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 40px rgba(0,0,0,0.4);
        }

        .group-badge {
            background: rgba(0,240,255,0.12);
            border: 1px solid var(--border-glass);
            border-radius: 2rem;
            padding: 0.5rem 1.4rem;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--accent-cyan);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            backdrop-filter: blur(8px);
            margin-bottom: 1rem;
        }

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

        /* Glass cards */
        .glass-card {
            background: rgba(13, 17, 30, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-fast);
            height: 100%;
        }

        .glass-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-2px);
        }

        .bg-card-deep {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
            padding: 1.8rem;
            height: 100%;
            transition: all var(--transition-fast);
        }

        .bg-card-deep:hover {
            border-color: var(--border-glass);
            box-shadow: 0 8px 25px rgba(0,0,0,0.5);
        }

        .icon-circle {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 1rem;
            flex-shrink: 0;
        }

        .icon-cyan {
            background: rgba(0,240,255,0.12);
            color: var(--accent-cyan);
        }

        .icon-blue {
            background: rgba(0,82,255,0.15);
            color: var(--accent-blue);
        }

        .step-number {
            font-size: 2.4rem;
            font-weight: 800;
            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;
        }

        .comparison-table {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-glass);
        }

        .comparison-table th {
            background: rgba(0,240,255,0.08);
            color: var(--accent-cyan);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 1rem;
            border-bottom: 1px solid var(--border-glass);
        }

        .comparison-table td {
            padding: 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.05);
            font-size: 0.95rem;
            color: var(--text-silver);
        }

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

        .check-icon {
            color: #10B981;
            margin-right: 0.4rem;
        }

        .minus-icon {
            color: var(--text-muted);
            margin-right: 0.4rem;
        }

        .accordion-custom .accordion-item {
            background: transparent;
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md) !important;
            margin-bottom: 0.8rem;
            overflow: hidden;
        }

        .accordion-custom .accordion-header {
            background: transparent;
        }

        .accordion-custom .accordion-button {
            background: rgba(13,17,30,0.6);
            backdrop-filter: blur(8px);
            color: var(--text-white);
            font-weight: 600;
            font-size: 1rem;
            padding: 1.2rem 1.5rem;
            box-shadow: none;
            border-radius: var(--radius-md) !important;
            transition: all var(--transition-fast);
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            background: rgba(0,240,255,0.08);
            color: var(--accent-cyan);
            box-shadow: none;
        }

        .accordion-custom .accordion-button::after {
            filter: brightness(0) invert(0.8);
        }

        .accordion-custom .accordion-body {
            background: rgba(8,9,15,0.6);
            color: var(--text-silver);
            padding: 1.2rem 1.5rem;
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .cta-section {
            background: linear-gradient(135deg, rgba(0,82,255,0.12), rgba(0,240,255,0.06));
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 3rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -30%;
            left: -10%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(0,240,255,0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .btn-xl {
            padding: 0.9rem 2.8rem;
            font-size: 1.1rem;
            font-weight: 700;
            border-radius: 3rem;
        }

        /* FAB */
        .fab-floating {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 1040;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(13,17,30,0.75);
            backdrop-filter: blur(14px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent-cyan);
            box-shadow: 0 0 18px rgba(0,240,255,0.45);
            transition: all var(--transition-fast);
            cursor: pointer;
            animation: fab-pulse 2.4s ease-in-out infinite;
        }

        .fab-floating::before {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: 50%;
            padding: 2px;
            background: linear-gradient(135deg, #00F0FF, #0052FF);
            -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;
            z-index: -1;
        }

        .fab-floating:hover {
            transform: scale(1.1);
            box-shadow: 0 0 28px rgba(0,240,255,0.7);
            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-dot 1.2s ease-in-out infinite;
        }

        @keyframes fab-pulse {
            0%, 100% { box-shadow: 0 0 18px rgba(0,240,255,0.45); }
            50% { box-shadow: 0 0 30px rgba(0,240,255,0.7); }
        }

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

        /* Footer */
        .footer-main {
            background: rgba(8,9,15,0.9);
            border-top: 1px solid rgba(0,240,255,0.1);
            padding: 3.5rem 0 1.5rem;
            margin-top: 3rem;
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-white);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .footer-main h6 {
            font-weight: 700;
            font-size: 0.95rem;
            margin-bottom: 1rem;
        }

        .footer-main a.text-muted:hover {
            color: var(--accent-cyan) !important;
        }

        @media (max-width: 991.98px) {
            .hero-section {
                padding: 3rem 0;
            }
            .hero-image-wrapper {
                margin-top: 2rem;
            }
        }

        @media (max-width: 767.98px) {
            .glass-card {
                padding: 1.4rem;
            }
            .cta-section {
                padding: 2rem 1.2rem;
            }
            .comparison-table th,
            .comparison-table td {
                font-size: 0.85rem;
                padding: 0.7rem 0.5rem;
            }
        }

        @media (max-width: 520px) {
            .navbar-brand-custom {
                font-size: 1.05rem;
            }
            .btn-glass,
            .btn-neon {
                padding: 0.45rem 1.2rem;
                font-size: 0.8rem;
            }
        }

/* roulang page: category2 */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glass: rgba(0,240,255,0.2);
            --shadow-neon: 0 0 15px rgba(0,240,255,0.5);
            --shadow-azure: 0 4px 20px rgba(0,82,255,0.3);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', 'Inter', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        body {
            background-color: var(--bg-deep);
            color: var(--text-silver);
            font-family: var(--font-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }

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

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

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

        .text-white-strong {
            color: var(--text-white);
        }

        .fw-800 {
            font-weight: 800;
        }

        /* Navbar */
        .navbar-main {
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.12);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1050;
        }

        .navbar-brand-custom {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-white);
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            white-space: nowrap;
        }

        .nav-link-custom {
            color: var(--text-silver);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            margin: 0 0.1rem;
            display: inline-block;
        }

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

        .btn-glass {
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid var(--border-glass);
            color: var(--accent-cyan);
            border-radius: 2rem;
            padding: 0.55rem 1.6rem;
            font-weight: 600;
            font-size: 0.9rem;
            backdrop-filter: blur(8px);
            transition: all var(--transition-fast);
            white-space: nowrap;
            cursor: pointer;
        }

        .btn-glass:hover {
            background: rgba(0, 240, 255, 0.2);
            box-shadow: var(--shadow-neon);
            color: var(--text-white);
        }

        .btn-neon {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            font-weight: 700;
            border-radius: 2rem;
            padding: 0.55rem 1.8rem;
            font-size: 0.9rem;
            box-shadow: var(--shadow-azure);
            transition: all var(--transition-fast);
            white-space: nowrap;
            cursor: pointer;
        }

        .btn-neon:hover {
            background: #0040cc;
            box-shadow: 0 6px 25px rgba(0, 82, 255, 0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .navbar-toggler {
            border: 1px solid rgba(0, 240, 255, 0.3);
            padding: 0.4rem 0.6rem;
            border-radius: var(--radius-sm);
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,240,255,0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        .navbar-collapse {
            background: rgba(8, 9, 15, 0.95);
            backdrop-filter: blur(20px);
            padding: 1rem;
            border-radius: var(--radius-md);
            margin-top: 0.5rem;
        }

        @media (min-width: 992px) {
            .navbar-collapse {
                background: transparent;
                backdrop-filter: none;
                padding: 0;
                margin-top: 0;
                border-radius: 0;
            }
        }

        /* Page Banner */
        .page-banner {
            background: linear-gradient(160deg, #08090F 0%, #0D111E 60%, #0A1424 100%);
            padding: 4rem 0 3rem;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-glass);
        }

        .page-banner::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -5%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.04) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .page-banner-title {
            font-size: clamp(2rem, 4.5vw, 3rem);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-white);
            margin-bottom: 1rem;
        }

        .page-banner-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 650px;
            line-height: 1.65;
        }

        /* Glass Card Style */
        .glass-card {
            background: rgba(13, 17, 30, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-fast);
        }

        .glass-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-2px);
        }

        .icon-circle {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.2rem;
            border: 1px solid var(--border-glass);
        }

        .icon-circle i {
            font-size: 1.6rem;
            color: var(--accent-cyan);
        }

        /* Stats Block */
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent-cyan);
            line-height: 1.1;
        }

        .stat-label {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-top: 0.3rem;
        }

        /* Process List */
        .process-item {
            display: flex;
            gap: 1.2rem;
            margin-bottom: 2rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

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

        .process-number {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: rgba(0, 240, 255, 0.15);
            border: 1px solid var(--border-glass);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--accent-cyan);
        }

        .process-content h5 {
            color: var(--text-white);
            font-weight: 700;
            margin-bottom: 0.4rem;
        }

        .process-content p {
            color: var(--text-muted);
            margin-bottom: 0;
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* Comparison Table */
        .table-compare {
            background: rgba(13, 17, 30, 0.5);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
        }

        .table-compare th {
            background: rgba(0, 240, 255, 0.08);
            color: var(--accent-cyan);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 1rem 1.2rem;
            border-bottom: 1px solid var(--border-glass);
        }

        .table-compare td {
            padding: 1rem 1.2rem;
            color: var(--text-silver);
            font-size: 0.9rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            vertical-align: middle;
        }

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

        .badge-win {
            background: rgba(0, 240, 255, 0.15);
            color: var(--accent-cyan);
            padding: 0.3rem 0.8rem;
            border-radius: 1rem;
            font-size: 0.8rem;
            font-weight: 600;
        }

        /* FAQ */
        .accordion-custom .accordion-button {
            background: rgba(13, 17, 30, 0.6);
            border: 1px solid var(--border-glass);
            color: var(--text-white);
            font-weight: 600;
            font-size: 1rem;
            padding: 1.2rem 1.5rem;
            border-radius: var(--radius-md) !important;
            box-shadow: none;
            transition: all var(--transition-fast);
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            background: rgba(0, 240, 255, 0.08);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            box-shadow: none;
        }

        .accordion-custom .accordion-button::after {
            filter: brightness(0) invert(1);
        }

        .accordion-custom .accordion-body {
            background: rgba(13, 17, 30, 0.3);
            border: 1px solid var(--border-glass);
            border-top: none;
            color: var(--text-muted);
            padding: 1.2rem 1.5rem;
            border-radius: 0 0 var(--radius-md) var(--radius-md);
            font-size: 0.95rem;
            line-height: 1.65;
        }

        .accordion-item {
            background: transparent;
            border: none;
            margin-bottom: 0.8rem;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.15) 0%, rgba(0, 240, 255, 0.08) 100%);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 3rem 2rem;
            text-align: center;
        }

        .cta-section h3 {
            color: var(--text-white);
            font-weight: 800;
            font-size: 1.8rem;
            margin-bottom: 0.8rem;
        }

        .cta-section p {
            color: var(--text-muted);
            max-width: 500px;
            margin: 0 auto 1.8rem;
            font-size: 1rem;
        }

        /* Footer */
        .footer-main {
            background: #06070D;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 3rem 0 2rem;
            margin-top: 3rem;
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-white);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .footer-main a.text-muted:hover {
            color: var(--accent-cyan) !important;
        }

        .footer-main h6 {
            font-weight: 700;
            font-size: 0.95rem;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 1040;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(13, 17, 30, 0.8);
            backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .fab-left::before {
            content: '';
            position: absolute;
            top: -3px;
            left: -3px;
            right: -3px;
            bottom: -3px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            z-index: -1;
            opacity: 0.7;
        }

        .fab-left i {
            font-size: 1.5rem;
            color: var(--accent-cyan);
            transition: all var(--transition-fast);
        }

        .fab-left:hover {
            transform: scale(1.1);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.7);
        }

        .fab-left:hover i {
            color: #fff;
        }

        @media (max-width: 767.98px) {
            .page-banner {
                padding: 2.5rem 0 2rem;
            }

            .glass-card {
                padding: 1.5rem;
            }

            .process-item {
                flex-direction: column;
                gap: 0.8rem;
            }

            .stat-number {
                font-size: 2.2rem;
            }

            .cta-section {
                padding: 2rem 1.2rem;
            }

            .fab-left {
                left: 1rem;
                bottom: 5rem;
                width: 46px;
                height: 46px;
            }
        }

/* roulang page: category4 */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glass: rgba(0,240,255,0.2);
            --shadow-neon: 0 0 15px rgba(0,240,255,0.5);
            --shadow-azure: 0 4px 20px rgba(0,82,255,0.3);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-heading: 'Segoe UI', 'Inter', 'Helvetica Neue', Arial, sans-serif;
            --font-body: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
        }
        body {
            background-color: var(--bg-deep);
            color: var(--text-silver);
            font-family: var(--font-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; height: auto; display: block; }
        .section-title {
            font-size: clamp(1.8rem, 3.5vw, 2.4rem);
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-white);
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.65;
        }
        .text-neon { color: var(--accent-cyan); }
        .text-gradient {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .navbar-main {
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0,240,255,0.12);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1050;
        }
        .navbar-brand-custom {
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-white);
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-link-custom {
            color: var(--text-silver);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            margin: 0 0.1rem;
        }
        .nav-link-custom:hover, .nav-link-custom.active {
            color: var(--accent-cyan);
            background: rgba(0,240,255,0.08);
        }
        .btn-glass {
            background: rgba(0,240,255,0.1);
            border: 1px solid var(--border-glass);
            color: var(--accent-cyan);
            border-radius: 2rem;
            padding: 0.55rem 1.6rem;
            font-weight: 600;
            font-size: 0.9rem;
            backdrop-filter: blur(8px);
            transition: all var(--transition-fast);
        }
        .btn-glass:hover {
            background: rgba(0,240,255,0.2);
            box-shadow: var(--shadow-neon);
            color: var(--text-white);
        }
        .btn-neon {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            font-weight: 700;
            border-radius: 2rem;
            padding: 0.55rem 1.8rem;
            font-size: 0.9rem;
            box-shadow: var(--shadow-azure);
            transition: all var(--transition-fast);
        }
        .btn-neon:hover {
            background: #0040cc;
            box-shadow: 0 6px 25px rgba(0,82,255,0.55);
            transform: translateY(-1px);
            color: #fff;
        }
        .navbar-toggler {
            border: 1px solid rgba(0,240,255,0.3);
            padding: 0.4rem 0.6rem;
            border-radius: var(--radius-sm);
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,240,255,0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }
        .navbar-collapse { background: rgba(8,9,15,0.95); backdrop-filter: blur(20px); padding: 1rem; border-radius: var(--radius-md); margin-top: 0.5rem; }
        .glass-card {
            background: rgba(13, 17, 30, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            transition: all var(--transition-fast);
        }
        .glass-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            transform: translateY(-2px);
        }
        .bg-card-deep {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
        }
        .page-banner {
            background: linear-gradient(160deg, #08090F 0%, #0D111E 60%, #0A1424 100%);
            padding: 3.5rem 0 2.5rem;
            border-bottom: 1px solid var(--border-glass);
            position: relative;
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -8%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0,240,255,0.05) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .tip-number {
            background: var(--accent-blue);
            color: #fff;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .highlight-box {
            background: rgba(0,240,255,0.05);
            border-left: 4px solid var(--accent-cyan);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            padding: 1.2rem 1.5rem;
            margin: 1.5rem 0;
        }
        .progress-ring {
            position: relative;
            width: 180px;
            height: 180px;
            margin: 0 auto;
        }
        .progress-ring-circle {
            transform: rotate(-90deg);
            width: 180px;
            height: 180px;
        }
        .progress-ring-circle-bg {
            fill: none;
            stroke: rgba(255,255,255,0.08);
            stroke-width: 10;
        }
        .progress-ring-circle-fg {
            fill: none;
            stroke: var(--accent-cyan);
            stroke-width: 10;
            stroke-linecap: round;
            stroke-dasharray: 440;
            stroke-dashoffset: 88;
            transition: stroke-dashoffset 0.8s ease;
        }
        .progress-value {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-white);
        }
        .tier-badge {
            display: inline-block;
            padding: 0.35rem 1rem;
            border-radius: 2rem;
            font-weight: 600;
            font-size: 0.85rem;
            border: 1px solid var(--border-glass);
            background: rgba(0,240,255,0.08);
            color: var(--accent-cyan);
        }
        .tier-badge.premium {
            background: rgba(255,215,0,0.1);
            border-color: rgba(255,215,0,0.4);
            color: #FFD700;
        }
        .footer-main {
            background: #05060C;
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 3rem 0 1.5rem;
            margin-top: 0;
        }
        .footer-brand {
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-white);
        }
        .footer-main h6 { font-weight: 700; font-size: 0.95rem; }
        .footer-main a { transition: color 0.2s; }
        .footer-main a:hover { color: var(--accent-cyan) !important; }
        .fab-left {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 1040;
        }
        .fab-btn {
            width: 52px;
            height: 52px;
            border-radius: 2rem;
            background: rgba(0,0,0,0.65);
            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: 1.3rem;
            transition: all var(--transition-fast);
            cursor: pointer;
            position: relative;
            box-shadow: 0 0 15px rgba(0,240,255,0.35);
        }
        .fab-btn::before {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: inherit;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            z-index: -1;
            opacity: 0.8;
        }
        .fab-btn:hover {
            transform: scale(1.12);
            opacity: 1;
            box-shadow: 0 0 25px rgba(0,240,255,0.7);
        }
        .fab-dot {
            position: absolute;
            top: 6px;
            right: 6px;
            width: 10px;
            height: 10px;
            background: #FF007F;
            border-radius: 50%;
            animation: pulse-dot 1.6s infinite;
        }
        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.4; transform: scale(1.6); }
        }
        @media (min-width: 992px) {
            .navbar-collapse { background: transparent; backdrop-filter: none; padding: 0; margin-top: 0; }
        }
        @media (max-width: 767.98px) {
            .fab-left { left: 0.75rem; bottom: 5rem; }
            .fab-btn { width: 46px; height: 46px; font-size: 1.1rem; }
        }