/* roulang page: index */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --bg-card-hover: rgba(20, 28, 48, 0.95);
            --accent-primary: #0052FF;
            --accent-secondary: #00F0FF;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #64748B;
            --border-glow: rgba(0, 240, 255, 0.3);
            --border-subtle: rgba(255, 255, 255, 0.08);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-medium: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-primary);
            font-family: 'Be Vietnam Pro', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
            background-size: 48px 48px;
            pointer-events: none;
            z-index: 0;
        }

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

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

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

        button, input, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        button {
            cursor: pointer;
        }

        button:focus-visible, a:focus-visible {
            outline: 2px solid var(--accent-secondary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            position: relative;
            z-index: 1;
        }

        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            transition: all var(--transition-medium);
        }

        .glass-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-glow);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.15), var(--shadow-md);
            transform: translateY(-3px);
        }

        .glow-button {
            background: linear-gradient(135deg, var(--accent-primary) 0%, #0066FF 50%, var(--accent-secondary) 100%);
            color: #FFFFFF;
            border-radius: var(--radius-sm);
            padding: 14px 28px;
            font-weight: 600;
            letter-spacing: 0.02em;
            position: relative;
            overflow: hidden;
            transition: all var(--transition-medium);
            box-shadow: 0 4px 20px rgba(0, 82, 255, 0.4);
        }

        .glow-button:hover {
            box-shadow: 0 8px 35px rgba(0, 240, 255, 0.5), 0 0 40px rgba(0, 82, 255, 0.3);
            transform: translateY(-2px);
            color: #FFFFFF;
        }

        .glow-button:active {
            transform: translateY(1px) scale(0.98);
            box-shadow: 0 2px 12px rgba(0, 82, 255, 0.3);
        }

        .glow-button::after {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.15) 50%, transparent 60%);
            animation: shimmer 3s infinite;
        }

        @keyframes shimmer {
            0% { transform: translateX(-100%) rotate(45deg); }
            100% { transform: translateX(100%) rotate(45deg); }
        }

        .outline-button {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-sm);
            padding: 13px 26px;
            font-weight: 500;
            transition: all var(--transition-medium);
        }

        .outline-button:hover {
            border-color: var(--accent-secondary);
            background: rgba(0, 240, 255, 0.08);
            color: var(--accent-secondary);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            background: rgba(0, 240, 255, 0.1);
            color: var(--accent-secondary);
            border: 1px solid rgba(0, 240, 255, 0.25);
        }

        .badge-hot {
            background: rgba(255, 0, 127, 0.15);
            color: #FF007F;
            border-color: rgba(255, 0, 127, 0.35);
        }

        .badge-new {
            background: rgba(0, 240, 255, 0.12);
            color: var(--accent-secondary);
            border-color: rgba(0, 240, 255, 0.3);
        }

        .section-padding {
            padding: 72px 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 16px;
            line-height: 1.25;
            letter-spacing: -0.01em;
        }

        .section-desc {
            color: var(--text-secondary);
            font-size: 1rem;
            max-width: 640px;
            margin-bottom: 40px;
            line-height: 1.6;
        }

        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.8);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(8, 9, 15, 0.8), rgba(8, 9, 15, 0.8)), linear-gradient(135deg, #00F0FF, #0052FF);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
            transition: all var(--transition-medium);
            opacity: 0.6;
            animation: fab-breathe 3s ease-in-out infinite;
        }

        .fab-left:hover {
            opacity: 1;
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.6), 0 0 50px rgba(0, 82, 255, 0.3);
            transform: scale(1.1);
            animation-play-state: paused;
        }

        .fab-left:active {
            transform: scale(0.95);
            border-color: #FF007F;
        }

        .fab-left i {
            font-size: 1.5rem;
            color: var(--accent-secondary);
            text-shadow: 0 0 12px rgba(0, 240, 255, 0.7);
        }

        .fab-left .notification-dot {
            position: absolute;
            top: -2px;
            right: -2px;
            width: 12px;
            height: 12px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid #08090F;
            animation: blink-dot 1.5s ease-in-out infinite;
        }

        @keyframes fab-breathe {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

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

        .nav-link {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
            padding: 6px 2px;
        }

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

        .nav-link.active {
            color: var(--accent-secondary);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
            border-radius: 2px;
            box-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
        }

        .comparison-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
        }

        .comparison-table th {
            background: rgba(0, 82, 255, 0.15);
            color: var(--text-primary);
            font-weight: 600;
            text-align: left;
            padding: 16px 20px;
            font-size: 0.95rem;
        }

        .comparison-table td {
            padding: 14px 20px;
            border-top: 1px solid var(--border-subtle);
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        .comparison-table .highlight-cell {
            background: rgba(0, 240, 255, 0.08);
            color: var(--text-primary);
            font-weight: 500;
        }

        .comparison-table .check-icon {
            color: var(--accent-secondary);
            margin-right: 6px;
        }

        .comparison-table .x-icon {
            color: #FF007F;
            margin-right: 6px;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
            transition: border-color var(--transition-fast);
        }

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

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 18px 0;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-primary);
            cursor: pointer;
            transition: color var(--transition-fast);
            text-align: left;
        }

        .faq-question:hover {
            color: var(--accent-secondary);
        }

        .faq-question i {
            font-size: 0.9rem;
            color: var(--accent-secondary);
            transition: transform var(--transition-medium);
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
            padding: 0;
        }

        .faq-answer.open {
            max-height: 300px;
            padding: 0 0 18px 0;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(8, 9, 15, 0.98);
            z-index: 100;
            padding: 80px 24px 24px;
            backdrop-filter: blur(20px);
        }

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

        .mobile-menu a {
            display: block;
            padding: 16px 0;
            font-size: 1.1rem;
            font-weight: 500;
            border-bottom: 1px solid var(--border-subtle);
            color: var(--text-secondary);
        }

        .mobile-menu a:hover {
            color: var(--accent-secondary);
        }

        @media (max-width: 768px) {
            .section-padding {
                padding: 48px 0;
            }
            
            .section-title {
                font-size: 1.6rem;
            }
            
            .section-desc {
                font-size: 0.9rem;
                margin-bottom: 28px;
            }
            
            .container {
                padding: 0 16px;
            }
            
            .comparison-table th,
            .comparison-table td {
                padding: 10px 12px;
                font-size: 0.8rem;
            }
            
            .fab-left {
                width: 48px;
                height: 48px;
                left: 12px;
                bottom: 80px;
            }
            
            .fab-left i {
                font-size: 1.2rem;
            }
        }

        @media (max-width: 520px) {
            .section-title {
                font-size: 1.4rem;
            }
            
            .glow-button {
                padding: 12px 20px;
                font-size: 0.9rem;
            }
            
            .outline-button {
                padding: 11px 18px;
                font-size: 0.9rem;
            }
        }

/* roulang page: article */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: rgba(13, 17, 30, 0.85);
            --bg-glass: rgba(255, 255, 255, 0.03);
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glass: rgba(255, 255, 255, 0.08);
            --border-cyan: rgba(0, 240, 255, 0.3);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.15);
            --shadow-cyan: 0 0 20px rgba(0, 240, 255, 0.3);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: 'Inter', 'Segoe UI', 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            transition: var(--transition);
        }

        /* Navigation */
        header {
            position: sticky;
            top: 0;
            z-index: 50;
            border-bottom: 1px solid var(--border-glass);
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
        }

        .nav-link {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 4px;
            transition: var(--transition);
        }

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

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

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

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

        .glow-button {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #FFFFFF;
            font-weight: 600;
            border-radius: 50px;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
            transition: var(--transition);
        }

        .glow-button:hover {
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.5);
            transform: translateY(-2px);
        }

        .glow-button:active {
            transform: translateY(0);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
        }

        /* Mobile Menu */
        #mobile-menu {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            background: rgba(8, 9, 15, 0.98);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-glass);
            z-index: 49;
            padding: 20px 24px;
            flex-direction: column;
            gap: 16px;
            transform: translateY(-10px);
            opacity: 0;
            pointer-events: none;
            transition: var(--transition);
        }

        #mobile-menu.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }

        #mobile-menu .mobile-nav-link {
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 10px 0;
            border-bottom: 1px solid var(--border-glass);
            transition: var(--transition);
        }

        #mobile-menu .mobile-nav-link:hover,
        #mobile-menu .mobile-nav-link.active {
            color: var(--accent-cyan);
        }

        /* Article Page Specific */
        .article-container {
            max-width: 800px;
            margin: 0 auto;
            padding: 48px 24px;
        }

        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }

        .article-breadcrumb a {
            color: var(--text-muted);
            transition: var(--transition);
        }

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

        .article-breadcrumb .separator {
            color: var(--text-muted);
            opacity: 0.5;
        }

        .article-category-tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid var(--border-cyan);
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }

        .article-title {
            font-size: 2.2rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border-glass);
            margin-bottom: 32px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

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

        .article-meta .meta-item i {
            color: var(--accent-cyan);
            font-size: 0.85rem;
        }

        .article-featured-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            margin-bottom: 32px;
            border: 1px solid var(--border-glass);
            box-shadow: var(--shadow-glow);
        }

        .article-featured-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        .article-body {
            font-size: 1.05rem;
            line-height: 1.7;
            color: var(--text-secondary);
        }

        .article-body h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 32px 0 16px;
            line-height: 1.3;
        }

        .article-body h3 {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--text-primary);
            margin: 24px 0 12px;
            line-height: 1.4;
        }

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

        .article-body ul,
        .article-body ol {
            margin: 16px 0;
            padding-left: 24px;
        }

        .article-body ul li,
        .article-body ol li {
            margin-bottom: 8px;
        }

        .article-body a {
            color: var(--accent-cyan);
            text-decoration: underline;
        }

        .article-body a:hover {
            color: var(--accent-blue);
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: 24px 0;
            border: 1px solid var(--border-glass);
        }

        .article-body blockquote {
            border-left: 3px solid var(--accent-cyan);
            padding: 16px 20px;
            margin: 24px 0;
            background: var(--bg-glass);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-primary);
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 0.95rem;
        }

        .article-body table th,
        .article-body table td {
            padding: 12px 16px;
            text-align: left;
            border: 1px solid var(--border-glass);
        }

        .article-body table th {
            background: var(--bg-glass);
            color: var(--text-primary);
            font-weight: 600;
        }

        .article-body table td {
            color: var(--text-secondary);
        }

        /* Article CTA */
        .article-cta {
            margin-top: 40px;
            padding: 32px;
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.15), rgba(0, 240, 255, 0.1));
            border: 1px solid var(--border-cyan);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-glow);
        }

        .article-cta h3 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .article-cta p {
            color: var(--text-secondary);
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .cta-buttons {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        .cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #FFFFFF;
            font-weight: 600;
            border-radius: 50px;
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.3);
            transition: var(--transition);
        }

        .cta-primary:hover {
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.5);
            transform: translateY(-2px);
        }

        .cta-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            background: transparent;
            color: var(--accent-cyan);
            font-weight: 600;
            border-radius: 50px;
            border: 1px solid var(--border-cyan);
            transition: var(--transition);
        }

        .cta-secondary:hover {
            background: rgba(0, 240, 255, 0.1);
            border-color: var(--accent-cyan);
        }

        /* Related Section */
        .related-section {
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid var(--border-glass);
        }

        .related-section h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 20px;
        }

        .related-card {
            display: block;
            padding: 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            transition: var(--transition);
        }

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

        .related-card .related-title {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .related-card .related-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Not Found */
        .not-found {
            text-align: center;
            padding: 80px 24px;
        }

        .not-found .icon {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 24px;
            opacity: 0.5;
        }

        .not-found h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

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

        /* Footer */
        footer {
            border-top: 1px solid var(--border-glass);
            padding-top: 48px;
            padding-bottom: 24px;
            background: rgba(8, 9, 15, 0.95);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-column h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .footer-column h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

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

        .footer-column .footer-link {
            display: block;
            font-size: 0.9rem;
            color: var(--text-muted);
            padding: 6px 0;
            transition: var(--transition);
        }

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

        .payment-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .payment-badge {
            display: inline-block;
            padding: 6px 14px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid var(--border-cyan);
            border-radius: 50px;
            font-size: 0.75rem;
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-glass);
            padding-top: 24px;
            display: flex;
            flex-direction: column;
            gap: 16px;
            text-align: center;
        }

        .footer-bottom .copyright {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .footer-bottom .badge-18 {
            display: inline-block;
            padding: 2px 10px;
            background: rgba(255, 0, 127, 0.1);
            border: 1px solid rgba(255, 0, 127, 0.3);
            border-radius: 4px;
            font-size: 0.75rem;
            color: #FF007F;
            font-weight: 600;
        }

        .footer-bottom .security-info {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .footer-bottom .security-info i {
            color: var(--accent-cyan);
        }

        /* FAB */
        .fab-container {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
        }

        .fab-button {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.9);
            border: 2px solid var(--accent-cyan);
            color: var(--accent-cyan);
            font-size: 1.5rem;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            position: relative;
            transition: var(--transition);
            opacity: 0.7;
            animation: fab-breathe 3s ease-in-out infinite;
        }

        .fab-button::before {
            content: '';
            position: absolute;
            inset: -4px;
            border-radius: 50%;
            border: 2px solid transparent;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue)) border-box;
            -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            opacity: 0.5;
        }

        .fab-button:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.6);
            animation-play-state: paused;
        }

        .fab-button:active {
            transform: scale(0.95);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
        }

        .fab-notification {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 16px;
            height: 16px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid #08090F;
            animation: blink-dot 1.5s ease-in-out infinite;
        }

        @keyframes fab-breathe {
            0%, 100% {
                box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
            }
            50% {
                box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
            }
        }

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

        /* Responsive */
        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: repeat(3, 1fr);
            }

            .footer-bottom {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
                text-align: left;
            }

            .footer-bottom .security-info {
                justify-content: flex-end;
            }

            .article-title {
                font-size: 2.6rem;
            }
        }

        @media (max-width: 1024px) {
            .container {
                padding: 0 20px;
            }

            .article-container {
                padding: 32px 20px;
            }

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

        @media (max-width: 767px) {
            .hidden-mobile {
                display: none;
            }

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

            .article-body {
                font-size: 1rem;
            }

            .article-body h2 {
                font-size: 1.4rem;
            }

            .article-body h3 {
                font-size: 1.15rem;
            }

            .article-cta {
                padding: 24px;
            }

            .cta-buttons {
                flex-direction: column;
            }

            .cta-primary,
            .cta-secondary {
                justify-content: center;
                width: 100%;
            }

            .fab-container {
                left: 12px;
                bottom: 80px;
            }

            .fab-button {
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .article-container {
                padding: 24px 16px;
            }

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

            .article-meta {
                gap: 10px;
                font-size: 0.8rem;
            }
        }

/* roulang page: category1 */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF007F;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #64748B;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-cyan: rgba(0, 240, 255, 0.3);
            --shadow-cyan: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-pink: 0 0 15px rgba(255, 0, 127, 0.4);
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2.5rem;
            --spacing-xl: 4rem;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        /* Navigation */
        .nav-link {
            color: var(--text-silver);
            font-size: 0.9rem;
            font-weight: 500;
            transition: color var(--transition-fast);
            position: relative;
        }
        .nav-link:hover {
            color: var(--accent-cyan);
        }
        .nav-link.active {
            color: var(--accent-cyan);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
            box-shadow: var(--shadow-cyan);
        }

        .glow-button {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            font-weight: 600;
            border-radius: 9999px;
            transition: all var(--transition-fast);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
            border: 1px solid rgba(0, 240, 255, 0.4);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }
        .glow-button:hover {
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
            transform: translateY(-1px);
            background: linear-gradient(135deg, #0066FF, #00F0FF);
        }
        .glow-button:active {
            transform: scale(0.97);
        }

        /* Glass Card */
        .glass-card {
            background: rgba(13, 17, 30, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            transition: all var(--transition-slow);
        }
        .glass-card:hover {
            border-color: var(--border-cyan);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.15);
            transform: translateY(-2px);
        }

        /* Stat Badge */
        .stat-badge {
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid var(--border-cyan);
            color: var(--accent-cyan);
            border-radius: 9999px;
            padding: 0.25rem 0.75rem;
            font-size: 0.75rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* FAQ Item */
        .faq-item {
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
            overflow: hidden;
        }
        .faq-item:hover {
            border-color: rgba(0, 240, 255, 0.3);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.1);
        }
        .faq-question {
            cursor: pointer;
            padding: var(--spacing-sm) var(--spacing-md);
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            color: var(--text-white);
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--accent-cyan);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
            padding: 0 var(--spacing-md);
            color: var(--text-silver);
        }
        .faq-item.open .faq-answer {
            max-height: 500px;
            padding-bottom: var(--spacing-md);
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
            color: var(--accent-cyan);
        }
        .faq-icon {
            transition: transform var(--transition-fast);
            color: var(--text-muted);
        }

        /* Data Flow Section */
        .data-panel {
            background: rgba(13, 17, 30, 0.5);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            transition: all var(--transition-fast);
        }
        .data-panel:hover {
            border-color: rgba(0, 240, 255, 0.25);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.1);
        }

        .metric-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--accent-cyan);
            line-height: 1.2;
        }

        /* Group Buy Section */
        .group-buy-card {
            background: linear-gradient(145deg, rgba(13, 17, 30, 0.8), rgba(0, 82, 255, 0.15));
            border: 1px solid rgba(0, 240, 255, 0.4);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            position: relative;
            overflow: hidden;
        }
        .group-buy-card::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.05), transparent 60%);
            pointer-events: none;
        }

        .step-number {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: #fff;
            flex-shrink: 0;
            box-shadow: var(--shadow-cyan);
        }

        /* FAB */
        .fab-cyber {
            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, var(--accent-cyan), var(--accent-pink));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.5rem;
            cursor: pointer;
            box-shadow: var(--shadow-cyan);
            opacity: 0.7;
            transition: all var(--transition-fast);
            animation: breathe 3s ease-in-out infinite;
        }
        .fab-cyber:hover {
            opacity: 1;
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.8);
            transform: scale(1.1);
            color: var(--accent-pink);
        }
        .fab-cyber:active {
            transform: scale(0.95);
        }
        @keyframes breathe {
            0%, 100% { opacity: 0.6; }
            50% { opacity: 0.9; }
        }

        /* Comparison Table */
        .compare-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
        }
        .compare-table th {
            background: rgba(0, 240, 255, 0.1);
            color: var(--accent-cyan);
            font-weight: 600;
            padding: var(--spacing-sm);
            text-align: left;
            border-bottom: 1px solid var(--border-cyan);
        }
        .compare-table td {
            padding: var(--spacing-sm);
            border-bottom: 1px solid var(--border-subtle);
            color: var(--text-silver);
        }
        .compare-table tr:hover td {
            background: rgba(0, 240, 255, 0.03);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .metric-value {
                font-size: 1.5rem;
            }
            .group-buy-card {
                padding: var(--spacing-md);
            }
            .fab-cyber {
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
                bottom: 5rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 var(--spacing-sm);
            }
            .metric-value {
                font-size: 1.25rem;
            }
            .step-number {
                width: 32px;
                height: 32px;
                font-size: 0.85rem;
            }
        }

        /* Focus States */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        /* Background Grid */
        .cyber-grid {
            background-image: 
                linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
            background-size: 40px 40px;
        }

/* roulang page: category2 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --accent-cyan: #00F0FF;
            --accent-blue: #0052FF;
            --accent-pink: #FF007F;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #64748B;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

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

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

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

        .nav-link {
            position: relative;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-silver);
            transition: color var(--transition-fast);
            padding: 0.5rem 0;
        }

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

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

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
            box-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
        }

        .glow-button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #0052FF, #00F0FF);
            color: #FFFFFF;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .glow-button:hover {
            box-shadow: 0 0 22px rgba(0, 240, 255, 0.55);
            transform: translateY(-2px);
        }

        .glow-button:active {
            transform: translateY(0) scale(0.98);
        }

        .outline-button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--accent-cyan);
            font-weight: 600;
            border: 1px solid rgba(0, 240, 255, 0.5);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
        }

        .outline-button:hover {
            background: rgba(0, 240, 255, 0.1);
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .glass-card {
            background: rgba(13, 17, 30, 0.75);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            transition: all var(--transition-smooth);
        }

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

        .section-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.1);
            padding: 0.4rem 1rem;
            border-radius: 100px;
            border: 1px solid rgba(0, 240, 255, 0.3);
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--text-white);
            line-height: 1.2;
            letter-spacing: -0.02em;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            border-color: rgba(0, 240, 255, 0.3);
        }

        .faq-question {
            cursor: pointer;
            padding: 1.25rem 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            font-weight: 600;
            color: var(--text-white);
            transition: color var(--transition-fast);
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth), padding var(--transition-smooth);
            color: var(--text-silver);
            font-size: 0.95rem;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-bottom: 1.25rem;
        }

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

        .faq-icon {
            transition: transform var(--transition-smooth);
            color: var(--accent-cyan);
        }

        .promo-badge {
            position: absolute;
            top: -12px;
            right: -12px;
            background: linear-gradient(135deg, #FF007F, #FF4500);
            color: white;
            font-weight: 700;
            font-size: 0.8rem;
            padding: 0.5rem 0.9rem;
            border-radius: 100px;
            box-shadow: 0 4px 15px rgba(255, 0, 127, 0.5);
            transform: rotate(8deg);
            animation: pulse-badge 2s ease-in-out infinite;
        }

        @keyframes pulse-badge {
            0%, 100% { transform: rotate(8deg) scale(1); }
            50% { transform: rotate(8deg) scale(1.08); }
        }

        .fab-left {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(8px);
            border-radius: 16px;
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), linear-gradient(135deg, #00F0FF, #FF007F);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            color: var(--accent-cyan);
            font-size: 1.5rem;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
            transition: all var(--transition-smooth);
            animation: float-fab 3s ease-in-out infinite;
        }

        .fab-left:hover {
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.7);
            transform: scale(1.1);
            color: #FF007F;
        }

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

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

        .fab-left .notification-dot {
            position: absolute;
            top: 4px;
            right: 4px;
            width: 12px;
            height: 12px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid #000;
            animation: blink-dot 1.2s ease-in-out infinite;
        }

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

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
            .stat-number {
                font-size: 2rem;
            }
            .fab-left {
                width: 48px;
                height: 48px;
                font-size: 1.25rem;
                bottom: 5rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 12px;
            }
            .stat-number {
                font-size: 1.75rem;
            }
        }