/* roulang page: index */
:root {
            --bg-primary: #080c17;
            --bg-secondary: #101826;
            --bg-card: rgba(18, 25, 45, 0.7);
            --bg-glass: rgba(16, 24, 38, 0.6);
            --border-glow: rgba(0, 150, 255, 0.25);
            --accent-cyan: #00c2ff;
            --accent-blue: #0066ff;
            --accent-gold: #ffb300;
            --text-primary: #ffffff;
            --text-secondary: #b0c7e0;
            --text-muted: #6b7f99;
            --gradient-main: linear-gradient(135deg, #0a1a3a 0%, #030b1a 100%);
            --shadow-glow: 0 0 25px rgba(0, 150, 255, 0.15);
            --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5);
            --border-radius: 18px;
            --border-radius-sm: 12px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: var(--bg-primary);
            color: var(--text-secondary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, .navbar-brand, .hero-title, .section-title {
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }
        .container-custom {
            width: 100%;
            max-width: 1260px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        /* NAVBAR */
        .navbar-modern {
            background: rgba(8, 12, 23, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 150, 255, 0.15);
            padding: 14px 0;
            transition: var(--transition);
            z-index: 1030;
        }
        .navbar-brand {
            font-size: 1.35rem;
            background: linear-gradient(to right, #ffffff, #8ecaff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
        }
        .navbar-nav .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            padding: 8px 18px !important;
            border-radius: 40px;
            transition: var(--transition);
            margin: 0 4px;
            font-size: 0.95rem;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: #ffffff !important;
            background: rgba(0, 150, 255, 0.12);
        }
        .btn-outline-glow {
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            background: transparent;
            border-radius: 50px;
            padding: 10px 24px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-outline-glow:hover {
            background: rgba(0, 200, 255, 0.15);
            border-color: #fff;
            color: #fff;
            box-shadow: 0 0 18px rgba(0, 150, 255, 0.4);
        }
        .btn-primary-glow {
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: none;
            color: #fff;
            font-weight: 700;
            padding: 10px 28px;
            border-radius: 50px;
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.45);
            transition: var(--transition);
        }
        .btn-primary-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 150, 255, 0.7);
            background: linear-gradient(145deg, #0077ff, #00b7ff);
        }
        /* HERO - Báo cáo / Tài liệu tải xuống */
        .hero-section {
            padding: 110px 0 80px;
            background: var(--gradient-main);
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: "";
            position: absolute;
            top: -15%;
            right: -10%;
            width: 550px;
            height: 550px;
            background: radial-gradient(circle, rgba(0,140,255,0.18) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 0;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-doc-card {
            background: rgba(12, 20, 35, 0.75);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(0, 180, 255, 0.25);
            border-radius: 28px;
            padding: 36px 32px;
            box-shadow: 0 30px 50px rgba(0,0,0,0.7);
        }
        .hero-badge {
            background: rgba(0, 200, 255, 0.15);
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: 30px;
            display: inline-block;
            margin-bottom: 20px;
        }
        .hero-title {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
        }
        .toc-list {
            list-style: none;
            padding: 0;
            margin: 25px 0;
        }
        .toc-list li {
            padding: 10px 0;
            border-bottom: 1px dashed rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            color: var(--text-secondary);
        }
        .toc-list i {
            color: var(--accent-cyan);
            margin-right: 14px;
            font-size: 1.1rem;
        }
        /* GLASS CARDS */
        .glass-card {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: var(--border-radius);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .glass-card:hover {
            border-color: rgba(0, 180, 255, 0.5);
            box-shadow: 0 0 40px rgba(0, 150, 255, 0.2);
            transform: translateY(-4px);
        }
        .section-title {
            font-size: 2rem;
            margin-bottom: 16px;
            position: relative;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 70px;
            height: 4px;
            background: var(--accent-cyan);
            margin-top: 14px;
            border-radius: 4px;
        }
        .milestone-step {
            background: rgba(0,0,0,0.3);
            border-left: 4px solid var(--accent-cyan);
            padding: 18px 24px;
            border-radius: 0 16px 16px 0;
            margin-bottom: 22px;
        }
        .collection-card {
            background: rgba(20, 30, 50, 0.8);
            border-radius: 24px;
            padding: 24px;
            border: 1px solid rgba(255,255,255,0.08);
        }
        .btn-cyan {
            background: var(--accent-cyan);
            color: #000;
            font-weight: 700;
            border-radius: 40px;
            padding: 12px 30px;
            border: none;
            transition: var(--transition);
        }
        .btn-cyan:hover {
            background: #fff;
            box-shadow: 0 0 25px cyan;
        }
        .faq-item {
            background: rgba(255,255,255,0.03);
            border-radius: 16px;
            padding: 20px 24px;
            margin-bottom: 16px;
            border: 1px solid transparent;
        }
        .faq-item:hover {
            border-color: var(--accent-blue);
        }
        footer {
            background: #030712;
            border-top: 1px solid rgba(0,150,255,0.2);
            padding: 48px 0 24px;
            color: var(--text-muted);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2rem;
            }
        }

/* roulang page: article */
:root {
            --bg-primary: #080c17;
            --bg-secondary: #101826;
            --bg-card: rgba(18, 25, 45, 0.7);
            --bg-glass: rgba(16, 24, 38, 0.6);
            --border-glow: rgba(0, 150, 255, 0.25);
            --accent-cyan: #00c2ff;
            --accent-blue: #0066ff;
            --accent-gold: #ffb300;
            --text-primary: #ffffff;
            --text-secondary: #b0c7e0;
            --text-muted: #6b7f99;
            --gradient-main: linear-gradient(135deg, #0a1a3a 0%, #030b1a 100%);
            --shadow-glow: 0 0 25px rgba(0, 150, 255, 0.15);
            --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5);
            --border-radius: 18px;
            --border-radius-sm: 12px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: var(--bg-primary);
            color: var(--text-secondary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }
        
        .container-custom {
            width: 100%;
            max-width: 1260px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        
        /* NAVBAR */
        .navbar-modern {
            background: rgba(8, 12, 23, 0.9);
            backdrop-filter: blur(22px);
            -webkit-backdrop-filter: blur(22px);
            border-bottom: 1px solid rgba(0, 150, 255, 0.18);
            padding: 14px 0;
            transition: var(--transition);
            z-index: 1030;
        }
        
        .navbar-brand {
            font-size: 1.35rem;
            background: linear-gradient(to right, #ffffff, #8ecaff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
            letter-spacing: -0.01em;
        }
        
        .navbar-nav .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            padding: 8px 18px !important;
            border-radius: 40px;
            transition: var(--transition);
            margin: 0 4px;
            font-size: 0.95rem;
        }
        
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: #ffffff !important;
            background: rgba(0, 150, 255, 0.12);
        }
        
        .btn-outline-glow {
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            background: transparent;
            border-radius: 50px;
            padding: 10px 24px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            text-decoration: none;
        }
        
        .btn-outline-glow:hover {
            background: rgba(0, 200, 255, 0.15);
            border-color: #ffffff;
            color: #ffffff;
            box-shadow: 0 0 18px rgba(0, 150, 255, 0.4);
        }
        
        .btn-primary-glow {
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: none;
            color: #ffffff;
            font-weight: 700;
            padding: 10px 28px;
            border-radius: 50px;
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.45);
            transition: var(--transition);
            text-decoration: none;
            font-size: 0.95rem;
        }
        
        .btn-primary-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 150, 255, 0.7);
            background: linear-gradient(145deg, #0077ff, #00b7ff);
            color: #ffffff;
        }
        
        /* ARTICLE HERO */
        .article-hero {
            background: var(--gradient-main);
            padding: 100px 0 60px;
            position: relative;
            overflow: hidden;
        }
        
        .article-hero::before {
            content: "";
            position: absolute;
            top: -20%;
            right: -12%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0,140,255,0.2) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 0;
        }
        
        .article-hero-content {
            position: relative;
            z-index: 2;
        }
        
        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        
        .article-meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-muted);
            font-size: 0.9rem;
            font-weight: 500;
        }
        
        .article-meta-item i {
            color: var(--accent-cyan);
        }
        
        .article-category-badge {
            background: rgba(0, 200, 255, 0.15);
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 18px;
            border-radius: 30px;
            display: inline-block;
        }
        
        .article-title {
            font-size: 2.6rem;
            line-height: 1.25;
            margin-bottom: 24px;
            color: #ffffff;
        }
        
        .article-excerpt {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 800px;
        }
        
        .article-featured-image {
            width: 100%;
            border-radius: 24px;
            margin-top: 30px;
            border: 1px solid rgba(0, 150, 255, 0.2);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
        }
        
        /* ARTICLE CONTENT */
        .article-content-wrapper {
            padding: 60px 0;
            background: var(--bg-primary);
        }
        
        .article-main-content {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: 24px;
            padding: 48px 40px;
            box-shadow: var(--shadow-card);
        }
        
        .article-main-content h2 {
            font-size: 1.8rem;
            margin-top: 36px;
            margin-bottom: 20px;
            color: #ffffff;
            border-left: 4px solid var(--accent-cyan);
            padding-left: 18px;
        }
        
        .article-main-content h3 {
            font-size: 1.4rem;
            margin-top: 28px;
            margin-bottom: 16px;
            color: #d0dfff;
        }
        
        .article-main-content p {
            font-size: 1.05rem;
            line-height: 1.75;
            margin-bottom: 20px;
            color: var(--text-secondary);
        }
        
        .article-main-content ul,
        .article-main-content ol {
            margin-bottom: 24px;
            padding-left: 24px;
        }
        
        .article-main-content li {
            margin-bottom: 10px;
            line-height: 1.7;
            color: var(--text-secondary);
        }
        
        .article-main-content img {
            max-width: 100%;
            border-radius: 16px;
            margin: 24px 0;
        }
        
        .article-main-content blockquote {
            border-left: 4px solid var(--accent-cyan);
            padding: 20px 28px;
            margin: 28px 0;
            background: rgba(0, 150, 255, 0.08);
            border-radius: 0 16px 16px 0;
            font-style: italic;
            color: #c0d4ff;
            font-size: 1.1rem;
        }
        
        .article-main-content a {
            color: var(--accent-cyan);
            text-decoration: underline;
            text-underline-offset: 4px;
            transition: var(--transition);
        }
        
        .article-main-content a:hover {
            color: #66d9ff;
        }
        
        /* SOCIAL SHARE */
        .article-share-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 28px 0;
            margin-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            flex-wrap: wrap;
            gap: 20px;
        }
        
        .share-buttons {
            display: flex;
            gap: 12px;
        }
        
        .share-btn {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: #ffffff;
            font-size: 1.2rem;
            transition: var(--transition);
            cursor: pointer;
            text-decoration: none;
        }
        
        .share-btn:hover {
            background: var(--accent-cyan);
            border-color: var(--accent-cyan);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 200, 255, 0.4);
        }
        
        /* RELATED SECTION */
        .related-section {
            padding: 60px 0;
            background: var(--bg-secondary);
        }
        
        .related-card {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: 20px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
        }
        
        .related-card:hover {
            border-color: rgba(0, 180, 255, 0.5);
            box-shadow: 0 0 40px rgba(0, 150, 255, 0.2);
            transform: translateY(-5px);
        }
        
        .related-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid rgba(0, 150, 255, 0.2);
        }
        
        .related-card-body {
            padding: 22px;
        }
        
        .related-card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        
        .related-card-text {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            line-height: 1.6;
        }
        
        .related-card-link {
            color: var(--accent-cyan);
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            font-size: 0.9rem;
        }
        
        .related-card-link:hover {
            color: #66d9ff;
        }
        
        .related-card-link i {
            margin-left: 6px;
            transition: var(--transition);
        }
        
        .related-card-link:hover i {
            transform: translateX(5px);
        }
        
        /* CTA SECTION */
        .cta-section {
            padding: 70px 0;
            background: var(--bg-primary);
        }
        
        .cta-glass {
            background: var(--bg-glass);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(0, 180, 255, 0.3);
            border-radius: 28px;
            padding: 50px 40px;
            text-align: center;
            box-shadow: 0 20px 50px rgba(0, 100, 255, 0.2);
        }
        
        .cta-title {
            font-size: 2rem;
            margin-bottom: 16px;
            color: #ffffff;
        }
        
        .cta-text {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 28px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .btn-cta-large {
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: none;
            color: #ffffff;
            font-weight: 700;
            padding: 16px 44px;
            border-radius: 50px;
            box-shadow: 0 8px 28px rgba(0, 102, 255, 0.5);
            transition: var(--transition);
            text-decoration: none;
            font-size: 1.1rem;
            display: inline-block;
        }
        
        .btn-cta-large:hover {
            transform: translateY(-3px);
            box-shadow: 0 16px 36px rgba(0, 150, 255, 0.75);
            background: linear-gradient(145deg, #0077ff, #00b7ff);
            color: #ffffff;
        }
        
        /* FOOTER */
        footer {
            background: var(--bg-secondary);
            border-top: 1px solid rgba(0, 150, 255, 0.2);
            padding: 40px 0 30px;
        }
        
        footer .small {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        
        footer a.text-muted {
            color: var(--text-muted) !important;
            font-size: 1.3rem;
            transition: var(--transition);
        }
        
        footer a.text-muted:hover {
            color: var(--accent-cyan) !important;
        }
        
        /* NOT FOUND STATE */
        .not-found-card {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: 24px;
            padding: 60px 40px;
            text-align: center;
            box-shadow: var(--shadow-card);
        }
        
        .not-found-card i {
            font-size: 4rem;
            color: var(--accent-cyan);
            margin-bottom: 20px;
        }
        
        .not-found-card h2 {
            font-size: 2rem;
            margin-bottom: 16px;
            color: #ffffff;
        }
        
        .not-found-card p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 28px;
        }
        
        .btn-back-home {
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: none;
            color: #ffffff;
            font-weight: 700;
            padding: 12px 32px;
            border-radius: 50px;
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.45);
            transition: var(--transition);
            text-decoration: none;
            display: inline-block;
        }
        
        .btn-back-home:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 150, 255, 0.7);
            color: #ffffff;
        }
        
        /* FAB */
        .fab-floating {
            position: fixed;
            left: 24px;
            bottom: 96px;
            z-index: 1050;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: 2px solid rgba(0, 200, 255, 0.6);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            font-size: 1.5rem;
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.5);
            transition: var(--transition);
            cursor: pointer;
            animation: floatPulse 3s ease-in-out infinite;
        }
        
        .fab-floating:hover {
            transform: scale(1.15);
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.8);
            border-color: #ffffff;
        }
        
        @keyframes floatPulse {
            0%, 100% { box-shadow: 0 0 25px rgba(0, 240, 255, 0.5); }
            50% { box-shadow: 0 0 50px rgba(0, 240, 255, 0.8); }
        }
        
        /* RESPONSIVE */
        @media (max-width: 1024px) {
            .article-title {
                font-size: 2.2rem;
            }
            .article-main-content {
                padding: 36px 28px;
            }
        }
        
        @media (max-width: 768px) {
            .article-title {
                font-size: 1.8rem;
            }
            .article-hero {
                padding: 80px 0 40px;
            }
            .article-main-content {
                padding: 28px 20px;
            }
            .article-main-content h2 {
                font-size: 1.5rem;
            }
            .article-main-content h3 {
                font-size: 1.25rem;
            }
            .cta-glass {
                padding: 36px 24px;
            }
            .cta-title {
                font-size: 1.6rem;
            }
            .fab-floating {
                width: 48px;
                height: 48px;
                left: 16px;
                bottom: 80px;
            }
        }
        
        @media (max-width: 520px) {
            .article-title {
                font-size: 1.5rem;
            }
            .article-main-content {
                padding: 20px 16px;
                border-radius: 16px;
            }
            .article-main-content p {
                font-size: 0.95rem;
            }
            .article-share-bar {
                flex-direction: column;
                align-items: flex-start;
            }
            .btn-cta-large {
                padding: 14px 32px;
                font-size: 1rem;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #080c17;
            --bg-secondary: #101826;
            --bg-card: rgba(18, 25, 45, 0.7);
            --bg-glass: rgba(16, 24, 38, 0.6);
            --border-glow: rgba(0, 150, 255, 0.25);
            --accent-cyan: #00c2ff;
            --accent-blue: #0066ff;
            --accent-gold: #ffb300;
            --text-primary: #ffffff;
            --text-secondary: #b0c7e0;
            --text-muted: #6b7f99;
            --gradient-main: linear-gradient(135deg, #0a1a3a 0%, #030b1a 100%);
            --shadow-glow: 0 0 25px rgba(0, 150, 255, 0.15);
            --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5);
            --border-radius: 18px;
            --border-radius-sm: 12px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }

        * {
            box-sizing: border-box;
        }

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

        h1, h2, h3, h4, .navbar-brand, .hero-title, .section-title {
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }

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

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

        .container-custom {
            width: 100%;
            max-width: 1260px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* NAVBAR */
        .navbar-modern {
            background: rgba(8, 12, 23, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 150, 255, 0.15);
            padding: 14px 0;
            transition: var(--transition);
            z-index: 1030;
        }
        .navbar-brand {
            font-size: 1.35rem;
            background: linear-gradient(to right, #ffffff, #8ecaff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
        }
        .navbar-nav .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            padding: 8px 18px !important;
            border-radius: 40px;
            transition: var(--transition);
            margin: 0 4px;
            font-size: 0.95rem;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: #ffffff !important;
            background: rgba(0, 150, 255, 0.12);
        }
        .btn-outline-glow {
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            background: transparent;
            border-radius: 50px;
            padding: 10px 24px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-outline-glow:hover {
            background: rgba(0, 200, 255, 0.15);
            border-color: #fff;
            color: #fff;
            box-shadow: 0 0 18px rgba(0, 150, 255, 0.4);
        }
        .btn-primary-glow {
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: none;
            color: #fff;
            font-weight: 700;
            padding: 10px 28px;
            border-radius: 50px;
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.45);
            transition: var(--transition);
        }
        .btn-primary-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 150, 255, 0.7);
            background: linear-gradient(145deg, #0077ff, #00b7ff);
        }

        /* PAGE HERO */
        .inner-hero {
            padding: 80px 0 50px;
            background: var(--gradient-main);
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-glow);
        }
        .inner-hero::after {
            content: "";
            position: absolute;
            top: -10%;
            left: -5%;
            width: 350px;
            height: 350px;
            background: radial-gradient(circle, rgba(0,180,255,0.2) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 0;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            background: rgba(0, 200, 255, 0.15);
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: 30px;
            display: inline-block;
            margin-bottom: 20px;
            border: 1px solid rgba(0,200,255,0.25);
        }
        .hero-title {
            font-size: 2.6rem;
            line-height: 1.25;
            margin-bottom: 18px;
        }
        .hero-subtitle {
            font-size: 1.15rem;
            max-width: 700px;
            color: var(--text-secondary);
            margin-bottom: 30px;
        }
        .feature-icon-box {
            width: 64px;
            height: 64px;
            background: rgba(0,150,255,0.1);
            border: 1px solid rgba(0,200,255,0.3);
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--accent-cyan);
            margin-bottom: 18px;
            transition: var(--transition);
        }

        /* GLASS CARD SYSTEM */
        .glass-card {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: var(--border-radius);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            height: 100%;
        }
        .glass-card:hover {
            border-color: rgba(0, 180, 255, 0.5);
            box-shadow: 0 0 40px rgba(0, 150, 255, 0.2);
            transform: translateY(-4px);
        }
        .section-title {
            font-size: 2rem;
            margin-bottom: 16px;
            position: relative;
        }
        .section-divider {
            width: 70px;
            height: 4px;
            background: linear-gradient(to right, var(--accent-cyan), var(--accent-blue));
            border-radius: 4px;
            margin: 16px 0 32px;
        }
        .text-gold {
            color: var(--accent-gold);
            font-weight: 600;
        }

        /* ADVANTAGE LIST */
        .advantage-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .advantage-list li {
            padding: 18px 0;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }
        .advantage-list li:last-child {
            border-bottom: none;
        }
        .adv-icon {
            font-size: 1.6rem;
            color: var(--accent-cyan);
            flex-shrink: 0;
            margin-top: 3px;
        }
        .adv-text strong {
            color: #fff;
            display: block;
            margin-bottom: 4px;
            font-size: 1.1rem;
        }

        /* STATS BLOCK */
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(to right, #00c2ff, #ffffff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1;
            margin-bottom: 6px;
        }

        /* FAQ */
        .faq-item {
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: var(--border-radius-sm);
            background: rgba(10,14,25,0.7);
            margin-bottom: 14px;
            overflow: hidden;
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            color: #fff;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.2s;
        }
        .faq-question:hover {
            background: rgba(255,255,255,0.03);
        }
        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-answer {
            display: block;
        }
        .faq-item.active .faq-toggle i {
            transform: rotate(180deg);
        }

        /* CTA SECTION */
        .cta-section {
            background: rgba(0,100,200,0.08);
            border: 1px solid var(--border-glow);
            border-radius: 28px;
            padding: 48px 40px;
            text-align: center;
            backdrop-filter: blur(10px);
        }

        /* FOOTER */
        footer {
            background: #05070e;
            padding: 40px 0 25px;
            border-top: 1px solid rgba(255,255,255,0.05);
            color: var(--text-muted);
            margin-top: 60px;
        }
        footer a {
            color: var(--text-muted);
            font-size: 1.2rem;
            transition: 0.2s;
        }
        footer a:hover {
            color: var(--accent-cyan);
        }

        /* RESPONSIVE */
        @media (max-width: 992px) {
            .hero-title { font-size: 2.2rem; }
            .section-title { font-size: 1.7rem; }
            .navbar-collapse {
                background: rgba(8,12,23,0.95);
                padding: 20px;
                border-radius: 16px;
                margin-top: 12px;
            }
        }
        @media (max-width: 768px) {
            .hero-title { font-size: 1.9rem; }
            .stat-number { font-size: 2rem; }
            .glass-card { padding: 20px 16px; }
            .cta-section { padding: 30px 20px; }
        }
        @media (max-width: 520px) {
            .container-custom { padding-left: 12px; padding-right: 12px; }
            .hero-title { font-size: 1.6rem; }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #080c17;
            --bg-secondary: #101826;
            --bg-card: rgba(18, 25, 45, 0.7);
            --bg-glass: rgba(16, 24, 38, 0.6);
            --border-glow: rgba(0, 150, 255, 0.25);
            --accent-cyan: #00c2ff;
            --accent-blue: #0066ff;
            --accent-gold: #ffb300;
            --text-primary: #ffffff;
            --text-secondary: #b0c7e0;
            --text-muted: #6b7f99;
            --gradient-main: linear-gradient(135deg, #0a1a3a 0%, #030b1a 100%);
            --shadow-glow: 0 0 25px rgba(0, 150, 255, 0.15);
            --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5);
            --border-radius: 18px;
            --border-radius-sm: 12px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }

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

        h1, h2, h3, h4, .navbar-brand, .hero-title, .section-title {
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }

        .container-custom {
            width: 100%;
            max-width: 1260px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* NAVBAR */
        .navbar-modern {
            background: rgba(8, 12, 23, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 150, 255, 0.15);
            padding: 14px 0;
            transition: var(--transition);
            z-index: 1030;
        }

        .navbar-brand {
            font-size: 1.35rem;
            background: linear-gradient(to right, #ffffff, #8ecaff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
        }

        .navbar-nav .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            padding: 8px 18px !important;
            border-radius: 40px;
            transition: var(--transition);
            margin: 0 4px;
            font-size: 0.95rem;
        }

        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: #ffffff !important;
            background: rgba(0, 150, 255, 0.12);
        }

        .btn-outline-glow {
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            background: transparent;
            border-radius: 50px;
            padding: 10px 24px;
            font-weight: 600;
            transition: var(--transition);
        }

        .btn-outline-glow:hover {
            background: rgba(0, 200, 255, 0.15);
            border-color: #fff;
            color: #fff;
            box-shadow: 0 0 18px rgba(0, 150, 255, 0.4);
        }

        .btn-primary-glow {
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: none;
            color: #fff;
            font-weight: 700;
            padding: 10px 28px;
            border-radius: 50px;
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.45);
            transition: var(--transition);
        }

        .btn-primary-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 150, 255, 0.7);
            background: linear-gradient(145deg, #0077ff, #00b7ff);
        }

        /* HERO */
        .hero-section {
            padding: 110px 0 80px;
            background: var(--gradient-main);
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: "";
            position: absolute;
            top: -15%;
            right: -10%;
            width: 550px;
            height: 550px;
            background: radial-gradient(circle, rgba(0,140,255,0.18) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 2;
        }

        .hero-doc-card {
            background: rgba(12, 20, 35, 0.75);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(0, 180, 255, 0.25);
            border-radius: 28px;
            padding: 36px 32px;
            box-shadow: 0 30px 50px rgba(0,0,0,0.7);
        }

        .hero-badge {
            background: rgba(0, 200, 255, 0.15);
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: 30px;
            display: inline-block;
            margin-bottom: 20px;
        }

        .hero-title {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
        }

        .toc-list {
            list-style: none;
            padding: 0;
            margin: 25px 0;
        }

        .toc-list li {
            padding: 10px 0;
            border-bottom: 1px dashed rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            color: var(--text-secondary);
        }

        .toc-list i {
            color: var(--accent-cyan);
            margin-right: 14px;
            font-size: 1.1rem;
        }

        /* GLASS CARDS */
        .glass-card {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: var(--border-radius);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

        .glass-card:hover {
            border-color: rgba(0, 180, 255, 0.5);
            box-shadow: 0 0 40px rgba(0, 150, 255, 0.2);
            transform: translateY(-4px);
        }

        .section-title {
            font-size: 2rem;
            margin-bottom: 16px;
            position: relative;
        }

        .feature-icon-box {
            width: 64px;
            height: 64px;
            border-radius: 20px;
            background: rgba(0, 150, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.8rem;
        }

        .highlight-list {
            list-style: none;
            padding: 0;
        }
        .highlight-list li {
            padding: 12px 0;
            border-left: 3px solid var(--accent-cyan);
            padding-left: 20px;
            margin-bottom: 12px;
            background: rgba(0, 160, 255, 0.05);
            border-radius: 0 10px 10px 0;
        }

        .process-step {
            border-left: 3px solid var(--accent-blue);
            padding-left: 28px;
            position: relative;
            margin-bottom: 30px;
        }
        .process-step::before {
            content: attr(data-step);
            position: absolute;
            left: -18px;
            top: 0;
            width: 34px;
            height: 34px;
            background: var(--accent-blue);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
        }

        .faq-accordion .accordion-button {
            background: var(--bg-glass);
            color: var(--text-primary);
            border: 1px solid var(--border-glow);
            border-radius: var(--border-radius-sm) !important;
            padding: 18px 24px;
            font-weight: 600;
            box-shadow: none;
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            background: rgba(0, 150, 255, 0.15);
            color: #ffffff;
            border-color: var(--accent-cyan);
        }
        .faq-accordion .accordion-body {
            background: var(--bg-glass);
            border: 1px solid var(--border-glow);
            border-top: none;
            border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
            color: var(--text-secondary);
            padding: 18px 24px;
        }

        .cta-block {
            background: linear-gradient(135deg, rgba(0,102,255,0.2), rgba(0,200,255,0.1));
            border: 1px solid var(--accent-cyan);
            border-radius: 28px;
            padding: 48px 32px;
            text-align: center;
        }

        footer {
            background: var(--bg-secondary);
            border-top: 1px solid rgba(255,255,255,0.08);
            padding: 40px 0 30px;
        }

        .fade-up {
            opacity: 0;
            animation: fadeUp 0.6s ease forwards;
        }
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(25px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @media (max-width: 992px) {
            .hero-title { font-size: 2rem; }
            .section-title { font-size: 1.6rem; }
        }
        @media (max-width: 576px) {
            .hero-title { font-size: 1.6rem; }
            .container-custom { padding-left: 16px; padding-right: 16px; }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #080c17;
            --bg-secondary: #101826;
            --bg-card: rgba(18, 25, 45, 0.7);
            --bg-glass: rgba(16, 24, 38, 0.6);
            --border-glow: rgba(0, 150, 255, 0.25);
            --accent-cyan: #00c2ff;
            --accent-blue: #0066ff;
            --accent-gold: #ffb300;
            --text-primary: #ffffff;
            --text-secondary: #b0c7e0;
            --text-muted: #6b7f99;
            --gradient-main: linear-gradient(135deg, #0a1a3a 0%, #030b1a 100%);
            --shadow-glow: 0 0 25px rgba(0, 150, 255, 0.15);
            --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5);
            --border-radius: 18px;
            --border-radius-sm: 12px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }

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

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

        h1, h2, h3, h4, .navbar-brand, .hero-title, .section-title {
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }

        .container-custom {
            width: 100%;
            max-width: 1260px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* NAVBAR */
        .navbar-modern {
            background: rgba(8, 12, 23, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 150, 255, 0.15);
            padding: 14px 0;
            transition: var(--transition);
            z-index: 1030;
        }

        .navbar-brand {
            font-size: 1.35rem;
            background: linear-gradient(to right, #ffffff, #8ecaff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
        }

        .navbar-nav .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            padding: 8px 18px !important;
            border-radius: 40px;
            transition: var(--transition);
            margin: 0 4px;
            font-size: 0.95rem;
        }

        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: #ffffff !important;
            background: rgba(0, 150, 255, 0.12);
        }

        .btn-outline-glow {
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            background: transparent;
            border-radius: 50px;
            padding: 10px 24px;
            font-weight: 600;
            transition: var(--transition);
        }

        .btn-outline-glow:hover {
            background: rgba(0, 200, 255, 0.15);
            border-color: #fff;
            color: #fff;
            box-shadow: 0 0 18px rgba(0, 150, 255, 0.4);
        }

        .btn-primary-glow {
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: none;
            color: #fff;
            font-weight: 700;
            padding: 10px 28px;
            border-radius: 50px;
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.45);
            transition: var(--transition);
        }

        .btn-primary-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 150, 255, 0.7);
            background: linear-gradient(145deg, #0077ff, #00b7ff);
        }

        /* HERO */
        .hero-section {
            padding: 110px 0 80px;
            background: var(--gradient-main);
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: "";
            position: absolute;
            top: -15%;
            right: -10%;
            width: 550px;
            height: 550px;
            background: radial-gradient(circle, rgba(0,140,255,0.18) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 2;
        }

        .hero-badge {
            background: rgba(255, 179, 0, 0.15);
            color: var(--accent-gold);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: 30px;
            display: inline-block;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 179, 0, 0.3);
        }

        .hero-title {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 30px;
        }

        .hero-promo-card {
            background: rgba(12, 20, 35, 0.75);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(255, 179, 0, 0.4);
            border-radius: 28px;
            padding: 36px 32px;
            box-shadow: 0 30px 50px rgba(0,0,0,0.7);
            position: relative;
        }

        .explosion-badge {
            position: absolute;
            top: -20px;
            right: -15px;
            background: #ff4500;
            color: #fff;
            font-weight: 800;
            font-size: 0.9rem;
            padding: 8px 20px;
            border-radius: 50px;
            transform: rotate(5deg);
            box-shadow: 0 8px 20px rgba(255, 69, 0, 0.5);
            letter-spacing: 0.05em;
        }

        .highlight-box {
            background: rgba(255, 179, 0, 0.08);
            border-left: 4px solid var(--accent-gold);
            padding: 16px 20px;
            border-radius: 0 12px 12px 0;
            margin: 20px 0;
        }

        /* GLASS CARDS */
        .glass-card {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: var(--border-radius);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

        .glass-card:hover {
            border-color: rgba(0, 180, 255, 0.5);
            box-shadow: 0 0 40px rgba(0, 150, 255, 0.2);
            transform: translateY(-4px);
        }

        .section-title {
            font-size: 2rem;
            margin-bottom: 16px;
            position: relative;
        }

        .promo-tag {
            display: inline-block;
            background: linear-gradient(135deg, #ffb300, #ff8f00);
            color: #000;
            font-weight: 700;
            font-size: 0.75rem;
            padding: 4px 12px;
            border-radius: 20px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .step-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 20px;
            padding: 16px;
            background: rgba(255, 255, 255, 0.02);
            border-radius: 12px;
            transition: var(--transition);
        }

        .step-item:hover {
            background: rgba(0, 150, 255, 0.08);
        }

        .step-number {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, #0066ff, #00c2ff);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            margin-right: 16px;
        }

        .stat-block {
            background: rgba(8, 12, 23, 0.6);
            border: 1px solid rgba(255, 179, 0, 0.2);
            border-radius: 16px;
            padding: 20px;
            text-align: center;
            transition: var(--transition);
        }

        .stat-block:hover {
            border-color: rgba(255, 179, 0, 0.5);
            box-shadow: 0 0 20px rgba(255, 179, 0, 0.15);
        }

        .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-gold);
            line-height: 1.2;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 6px;
        }

        .benefit-list {
            list-style: none;
            padding: 0;
        }

        .benefit-list li {
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            font-size: 1rem;
        }

        .benefit-list i {
            color: var(--accent-gold);
            margin-right: 12px;
            font-size: 1.2rem;
        }

        /* FAQ */
        .faq-item {
            background: var(--bg-glass);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 14px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(0, 180, 255, 0.3);
        }

        .faq-question {
            padding: 20px 24px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--text-primary);
            font-size: 1.05rem;
        }

        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--accent-cyan);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }

        /* FOOTER */
        footer {
            background: #060a13;
            border-top: 1px solid rgba(0, 150, 255, 0.15);
            padding: 40px 0;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-link {
            color: var(--text-muted);
            text-decoration: none;
            transition: var(--transition);
            display: inline-block;
            margin: 0 12px;
        }

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

        .social-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-muted);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
            text-decoration: none;
        }

        .social-icon:hover {
            background: rgba(0, 150, 255, 0.2);
            color: var(--accent-cyan);
            transform: translateY(-3px);
        }

        /* RESPONSIVE */
        @media (max-width: 1024px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .stat-number {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 768px) {
            .hero-section {
                padding: 90px 0 50px;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .hero-promo-card {
                padding: 24px 20px;
            }
            .explosion-badge {
                top: -18px;
                right: -5px;
                font-size: 0.75rem;
                padding: 6px 14px;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .stat-block {
                padding: 16px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.5rem;
            }
            .container-custom {
                padding-left: 14px;
                padding-right: 14px;
            }
            .hero-promo-card {
                padding: 20px 16px;
            }
            .step-number {
                width: 34px;
                height: 34px;
                font-size: 0.95rem;
                margin-right: 12px;
            }
            .navbar-brand {
                font-size: 1.1rem;
            }
        }

/* roulang page: category4 */
:root {
            --bg-primary: #080c17;
            --bg-secondary: #101826;
            --bg-card: rgba(18, 25, 45, 0.7);
            --bg-glass: rgba(16, 24, 38, 0.6);
            --border-glow: rgba(0, 150, 255, 0.25);
            --accent-cyan: #00c2ff;
            --accent-blue: #0066ff;
            --accent-gold: #ffb300;
            --accent-amber: #ff9f00;
            --text-primary: #ffffff;
            --text-secondary: #b0c7e0;
            --text-muted: #6b7f99;
            --gradient-main: linear-gradient(135deg, #0a1a3a 0%, #030b1a 100%);
            --shadow-glow: 0 0 25px rgba(0, 150, 255, 0.15);
            --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5);
            --border-radius: 18px;
            --border-radius-sm: 12px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
        }

        * {
            box-sizing: border-box;
        }

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

        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }

        p {
            margin-bottom: 1rem;
        }

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

        a:hover {
            color: #fff;
        }

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

        .container-custom {
            width: 100%;
            max-width: 1260px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* NAVBAR */
        .navbar-modern {
            background: rgba(8, 12, 23, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 150, 255, 0.15);
            padding: 14px 0;
            transition: var(--transition);
            z-index: 1030;
        }

        .navbar-brand {
            font-size: 1.35rem;
            background: linear-gradient(to right, #ffffff, #8ecaff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
        }

        .navbar-nav .nav-link {
            color: var(--text-secondary) !important;
            font-weight: 500;
            padding: 8px 18px !important;
            border-radius: 40px;
            transition: var(--transition);
            margin: 0 4px;
            font-size: 0.95rem;
        }

        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: #ffffff !important;
            background: rgba(0, 150, 255, 0.12);
        }

        .btn-outline-glow {
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            background: transparent;
            border-radius: 50px;
            padding: 10px 24px;
            font-weight: 600;
            transition: var(--transition);
        }

        .btn-outline-glow:hover {
            background: rgba(0, 200, 255, 0.15);
            border-color: #fff;
            color: #fff;
            box-shadow: 0 0 18px rgba(0, 150, 255, 0.4);
        }

        .btn-primary-glow {
            background: linear-gradient(145deg, #0066ff, #00a6ff);
            border: none;
            color: #fff;
            font-weight: 700;
            padding: 10px 28px;
            border-radius: 50px;
            box-shadow: 0 6px 20px rgba(0, 102, 255, 0.45);
            transition: var(--transition);
            display: inline-block;
            text-align: center;
        }

        .btn-primary-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 150, 255, 0.7);
            background: linear-gradient(145deg, #0077ff, #00b7ff);
            color: #fff;
        }

        .btn-gold {
            background: linear-gradient(145deg, #ff9f00, #ffb300);
            border: none;
            color: #030b1a;
            font-weight: 700;
            padding: 12px 32px;
            border-radius: 50px;
            box-shadow: 0 6px 20px rgba(255, 179, 0, 0.5);
            transition: var(--transition);
            display: inline-block;
            text-align: center;
        }

        .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(255, 179, 0, 0.75);
            color: #030b1a;
        }

        /* HERO */
        .hero-section {
            padding: 110px 0 80px;
            background: var(--gradient-main);
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: "";
            position: absolute;
            top: -15%;
            right: -10%;
            width: 550px;
            height: 550px;
            background: radial-gradient(circle, rgba(0,140,255,0.18) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 2;
        }

        .hero-badge {
            background: rgba(255, 179, 0, 0.15);
            color: var(--accent-gold);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: 30px;
            display: inline-block;
            margin-bottom: 20px;
        }

        .hero-title {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
        }

        .countdown-timer {
            background: rgba(18, 25, 45, 0.8);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 179, 0, 0.4);
            border-radius: var(--border-radius);
            padding: 24px 32px;
            display: inline-block;
            margin: 24px 0;
        }

        .countdown-timer .time-unit {
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--accent-gold);
            display: inline-block;
            min-width: 60px;
            text-align: center;
        }

        .countdown-timer .time-label {
            font-size: 0.75rem;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        /* GLASS CARDS */
        .glass-card {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: var(--border-radius);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

        .glass-card:hover {
            border-color: rgba(0, 180, 255, 0.5);
            box-shadow: 0 0 40px rgba(0, 150, 255, 0.2);
            transform: translateY(-4px);
        }

        .gold-card {
            border: 1.5px solid rgba(255, 179, 0, 0.35);
            background: rgba(16, 24, 38, 0.8);
        }

        .gold-card:hover {
            border-color: rgba(255, 179, 0, 0.7);
            box-shadow: 0 0 35px rgba(255, 179, 0, 0.25);
        }

        .section-title {
            font-size: 2rem;
            margin-bottom: 16px;
            position: relative;
        }

        .section-subtitle {
            color: var(--text-muted);
            font-size: 1.05rem;
            margin-bottom: 40px;
        }

        .promo-badge {
            background: linear-gradient(135deg, #ff9f00, #ffb300);
            color: #000;
            font-weight: 700;
            font-size: 0.8rem;
            padding: 4px 12px;
            border-radius: 20px;
            display: inline-block;
        }

        .promo-value {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--accent-gold);
            line-height: 1.2;
        }

        .promo-term {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* SELLING POINTS */
        .selling-point-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .selling-point-item {
            flex: 1 1 280px;
            background: rgba(18, 25, 45, 0.5);
            border-left: 4px solid var(--accent-gold);
            border-radius: 12px;
            padding: 24px;
            transition: var(--transition);
        }

        .selling-point-item:hover {
            background: rgba(18, 25, 45, 0.8);
            border-left-color: #fff;
        }

        .selling-point-icon {
            font-size: 2.2rem;
            color: var(--accent-gold);
            margin-bottom: 16px;
        }

        /* BONUS TABLE */
        .bonus-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            border-radius: var(--border-radius);
            overflow: hidden;
        }

        .bonus-table th {
            background: rgba(0, 150, 255, 0.15);
            color: var(--text-primary);
            font-weight: 600;
            padding: 16px;
            text-align: left;
        }

        .bonus-table td {
            background: rgba(18, 25, 45, 0.5);
            color: var(--text-secondary);
            padding: 16px;
            border-bottom: 1px solid rgba(255,255,255,0.05);
        }

        .bonus-table tr:hover td {
            background: rgba(18, 25, 45, 0.8);
        }

        /* FAQ */
        .faq-item {
            background: var(--bg-glass);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            border-radius: var(--border-radius-sm);
            margin-bottom: 16px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(0, 180, 255, 0.4);
        }

        .faq-question {
            padding: 20px 24px;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-secondary);
            display: none;
        }

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

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        /* CTA SECTION */
        .cta-section {
            background: linear-gradient(145deg, rgba(10, 26, 58, 0.95), rgba(3, 11, 26, 0.95));
            border: 1px solid rgba(255, 179, 0, 0.3);
            border-radius: var(--border-radius);
            padding: 48px 32px;
            text-align: center;
            box-shadow: 0 0 50px rgba(255, 179, 0, 0.15);
        }

        /* FOOTER */
        footer {
            background: rgba(8, 12, 23, 0.95);
            border-top: 1px solid rgba(0, 150, 255, 0.15);
            padding: 40px 0 30px;
            text-align: center;
        }

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

        .text-gold {
            color: var(--accent-gold) !important;
        }

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

        /* RESPONSIVE */
        @media (max-width: 1024px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .container-custom {
                padding-left: 20px;
                padding-right: 20px;
            }
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 1.8rem;
            }
            .hero-section {
                padding: 90px 0 50px;
            }
            .countdown-timer .time-unit {
                font-size: 1.6rem;
                min-width: 44px;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .selling-point-item {
                flex: 1 1 100%;
            }
        }

        @media (max-width: 520px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
            .hero-title {
                font-size: 1.5rem;
            }
            .btn-primary-glow,
            .btn-gold {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
            .countdown-timer {
                padding: 16px 20px;
            }
            .countdown-timer .time-unit {
                font-size: 1.4rem;
                min-width: 38px;
            }
        }