/* roulang page: index */
:root {
            --bg-primary: #121417;
            --bg-secondary: #1a1d23;
            --bg-card: #20242b;
            --bg-card-hover: #272c35;
            --bg-hero: #0b0d10;
            --metal-dark: #2c313a;
            --metal-light: #4a515d;
            --text-primary: #f0f2f5;
            --text-secondary: #b8bdc7;
            --text-muted: #858c99;
            --accent: #e8b84b;
            --accent-hover: #f0c55f;
            --accent-soft: rgba(232,184,75,0.12);
            --border: #2e333d;
            --border-light: #3a404b;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.18);
            --shadow-md: 0 6px 18px rgba(0,0,0,0.24);
            --shadow-lg: 0 14px 34px rgba(0,0,0,0.32);
            --transition: all 0.22s ease;
            --font-body: 'Segoe UI', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1280px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-body);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        img { max-width: 100%; display: block; }
        a { color: var(--accent); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent-hover); }
        .container { max-width: var(--container-max); margin: 0 auto; padding: 0 20px; }
        .section-pad { padding: 72px 0; }
        .section-pad-sm { padding: 48px 0; }
        .text-accent { color: var(--accent); }
        .text-muted { color: var(--text-muted); }
        .text-secondary { color: var(--text-secondary); }
        .bg-dark-2 { background: var(--bg-secondary); }
        .bg-card { background: var(--bg-card); }
        .rounded { border-radius: var(--radius-md); }
        .rounded-lg { border-radius: var(--radius-lg); }
        .border-metal { border: 1px solid var(--border); }
        .mb-0 { margin-bottom: 0; }
        .mb-1 { margin-bottom: 12px; }
        .mb-2 { margin-bottom: 20px; }
        .mb-3 { margin-bottom: 32px; }
        .mb-4 { margin-bottom: 48px; }
        .mt-1 { margin-top: 12px; }
        .mt-2 { margin-top: 20px; }
        .mt-3 { margin-top: 32px; }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin-bottom: 36px;
        }
        .divider-metal {
            height: 2px;
            background: linear-gradient(90deg, var(--metal-dark), var(--metal-light), var(--metal-dark));
            width: 80px;
            margin: 0 0 20px 0;
        }
        /* Header / Nav */
        .site-header {
            background: rgba(18,20,23,0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 0;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 70px;
        }
        .brand {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.01em;
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
        }
        .brand i { color: var(--accent); font-size: 1.4rem; }
        .nav-desktop { display: flex; align-items: center; gap: 8px; }
        .nav-desktop a {
            color: var(--text-secondary);
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-desktop a:hover { color: var(--text-primary); background: var(--bg-card); }
        .nav-desktop a.active { color: var(--accent); background: var(--accent-soft); }
        .nav-actions { display: flex; align-items: center; gap: 10px; }
        .btn-nav-login {
            background: transparent;
            border: 1px solid var(--border-light);
            color: var(--text-primary);
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-nav-login:hover { border-color: var(--accent); color: var(--accent); }
        .btn-nav-signup {
            background: var(--accent);
            color: #121417;
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            white-space: nowrap;
        }
        .btn-nav-signup:hover { background: var(--accent-hover); color: #121417; }
        .nav-toggle {
            display: none;
            background: transparent;
            border: 1px solid var(--border-light);
            color: var(--text-primary);
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            font-size: 1.2rem;
            cursor: pointer;
            align-items: center;
            justify-content: center;
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            background: var(--bg-secondary);
            border-top: 1px solid var(--border);
            padding: 12px 20px 16px;
        }
        .mobile-menu a {
            color: var(--text-secondary);
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
            font-weight: 500;
        }
        .mobile-menu a:last-child { border-bottom: none; }
        .mobile-menu a.active { color: var(--accent); }
        /* Hero */
        .hero-section {
            background: var(--bg-hero);
            background-image: linear-gradient(rgba(10,12,15,0.85), rgba(10,12,15,0.92)), url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            padding: 96px 0 72px;
            border-bottom: 1px solid var(--border);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.3fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .hero-label {
            display: inline-block;
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 20px;
            border: 1px solid rgba(232,184,75,0.3);
        }
        .hero-title {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.2;
            margin-bottom: 20px;
            color: #fff;
        }
        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 560px;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
        }
        .btn-primary {
            background: var(--accent);
            color: #121417;
            padding: 14px 28px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-primary:hover { background: var(--accent-hover); color: #121417; }
        .btn-outline {
            background: transparent;
            border: 1px solid var(--border-light);
            color: var(--text-primary);
            padding: 14px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-outline:hover { border-color: var(--accent); color: var(--accent); }
        .hero-stats {
            display: flex;
            gap: 28px;
            margin-top: 28px;
            flex-wrap: wrap;
        }
        .hero-stat {
            text-align: left;
        }
        .hero-stat-number {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
        }
        .hero-stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .hero-panel {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-lg);
        }
        .progress-ring-wrap {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 24px;
            margin-bottom: 24px;
        }
        .progress-ring {
            width: 110px;
            height: 110px;
            border-radius: 50%;
            background: conic-gradient(var(--accent) 0% 68%, var(--metal-dark) 68% 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        .progress-ring-inner {
            width: 82px;
            height: 82px;
            border-radius: 50%;
            background: var(--bg-card);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.4rem;
            color: var(--accent);
        }
        .progress-ring-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            max-width: 130px;
        }
        .progress-ring-label strong { color: var(--text-primary); }
        .tier-list { margin-top: 16px; }
        .tier-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
        }
        .tier-item:last-child { border-bottom: none; }
        .tier-name { font-weight: 600; font-size: 0.95rem; }
        .tier-badge {
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 0.75rem;
            padding: 4px 10px;
            border-radius: 12px;
            font-weight: 600;
        }
        /* Cards & Grids */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 26px;
            transition: var(--transition);
            position: relative;
        }
        .feature-card:hover {
            border-color: var(--metal-light);
            background: var(--bg-card-hover);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .feature-icon {
            width: 48px;
            height: 48px;
            background: var(--accent-soft);
            color: var(--accent);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 16px;
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .feature-card p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.65;
        }
        /* Live preview */
        .live-preview {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
        }
        .live-preview-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            border-bottom: 1px solid var(--border);
            background: var(--bg-card);
        }
        .live-preview-header h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin: 0;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .live-dot {
            width: 8px;
            height: 8px;
            background: #e74c3c;
            border-radius: 50%;
            animation: pulse 1.6s infinite;
        }
        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.4; }
        }
        .live-preview-body {
            padding: 24px;
        }
        .live-row {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
        }
        .live-row:last-child { border-bottom: none; }
        .live-row-icon {
            width: 40px;
            height: 40px;
            background: var(--metal-dark);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            flex-shrink: 0;
        }
        .live-row-info { flex: 1; }
        .live-row-title { font-weight: 600; font-size: 0.9rem; }
        .live-row-meta { font-size: 0.8rem; color: var(--text-muted); }
        .live-row-status {
            font-size: 0.75rem;
            background: var(--accent-soft);
            color: var(--accent);
            padding: 4px 10px;
            border-radius: 12px;
            font-weight: 600;
            white-space: nowrap;
        }
        /* Info list */
        .info-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .info-list li {
            padding: 16px 0;
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }
        .info-list li:last-child { border-bottom: none; }
        .info-list-icon {
            width: 36px;
            height: 36px;
            background: var(--accent-soft);
            color: var(--accent);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 0.95rem;
        }
        .info-list-title { font-weight: 600; font-size: 0.98rem; margin-bottom: 2px; }
        .info-list-desc { font-size: 0.85rem; color: var(--text-secondary); }
        /* Ranking list */
        .ranking-table {
            width: 100%;
            border-collapse: collapse;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border);
        }
        .ranking-table th {
            text-align: left;
            padding: 14px 16px;
            font-size: 0.8rem;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--text-muted);
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border);
            font-weight: 600;
        }
        .ranking-table td {
            padding: 14px 16px;
            border-bottom: 1px solid var(--border);
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .ranking-table tr:last-child td { border-bottom: none; }
        .ranking-table tr:hover td { background: var(--bg-card-hover); }
        .rank-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            border-radius: 4px;
            font-weight: 700;
            font-size: 0.85rem;
            background: var(--metal-dark);
            color: var(--text-primary);
        }
        .rank-badge.top1 { background: #e8b84b; color: #121417; }
        .rank-badge.top2 { background: #b0b8c4; color: #121417; }
        .rank-badge.top3 { background: #c9803e; color: #121417; }
        .rank-trend-up { color: #4caf50; font-size: 0.8rem; }
        .rank-trend-down { color: #e74c3c; font-size: 0.8rem; }
        /* Content list */
        .content-list {
            display: grid;
            grid-template-columns: 1.5fr 1fr;
            gap: 32px;
        }
        .content-list-main {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
        }
        .content-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px 0;
            border-bottom: 1px solid var(--border);
        }
        .content-item:last-child { border-bottom: none; }
        .content-item-index {
            width: 32px;
            height: 32px;
            background: var(--metal-dark);
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.85rem;
            color: var(--accent);
            flex-shrink: 0;
        }
        .content-item-body { flex: 1; }
        .content-item-title {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-primary);
            transition: var(--transition);
        }
        .content-item-title:hover { color: var(--accent); }
        .content-item-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            gap: 12px;
            margin-top: 4px;
        }
        .content-sidebar {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
            height: fit-content;
        }
        .content-sidebar h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-item {
            display: flex;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
            align-items: center;
        }
        .sidebar-item:last-child { border-bottom: none; }
        .sidebar-thumb {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
        }
        .sidebar-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .sidebar-item-title {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .sidebar-item-meta {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 2px;
        }
        /* Membership */
        .membership-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .membership-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 26px;
            transition: var(--transition);
        }
        .membership-card:hover {
            border-color: var(--metal-light);
            background: var(--bg-card-hover);
            transform: translateY(-2px);
        }
        .membership-card.highlight {
            border-color: var(--accent);
            background: var(--accent-soft);
        }
        .membership-badge {
            display: inline-block;
            background: var(--accent);
            color: #121417;
            font-size: 0.7rem;
            font-weight: 700;
            text-transform: uppercase;
            padding: 4px 10px;
            border-radius: 12px;
            letter-spacing: 0.04em;
            margin-bottom: 12px;
        }
        .membership-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .membership-card ul {
            list-style: none;
            padding: 0;
            margin: 0 0 16px;
        }
        .membership-card ul li {
            padding: 6px 0;
            color: var(--text-secondary);
            font-size: 0.88rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .membership-card ul li i { color: var(--accent); font-size: 0.75rem; }
        .btn-membership {
            display: inline-block;
            background: var(--accent);
            color: #121417;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            width: 100%;
            text-align: center;
        }
        .btn-membership:hover { background: var(--accent-hover); color: #121417; }
        .btn-membership-outline {
            display: inline-block;
            background: transparent;
            border: 1px solid var(--border-light);
            color: var(--text-primary);
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            cursor: pointer;
            width: 100%;
            text-align: center;
        }
        .btn-membership-outline:hover { border-color: var(--accent); color: var(--accent); }
        /* FAQ */
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
        }
        .faq-question {
            padding: 18px 22px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.98rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: var(--transition);
            color: var(--text-primary);
            user-select: none;
        }
        .faq-question:hover { color: var(--accent); }
        .faq-question i { transition: var(--transition); font-size: 0.85rem; color: var(--text-muted); }
        .faq-answer {
            padding: 0 22px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 0 22px 18px;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--accent);
        }
        /* Subscribe */
        .subscribe-box {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 40px;
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 32px;
            align-items: center;
        }
        .subscribe-box h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .subscribe-box p {
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        .subscribe-form {
            display: flex;
            gap: 10px;
        }
        .subscribe-form input {
            flex: 1;
            padding: 13px 18px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            background: var(--bg-primary);
            color: var(--text-primary);
            font-size: 0.95rem;
            outline: none;
            transition: var(--transition);
        }
        .subscribe-form input:focus {
            border-color: var(--accent);
        }
        /* Track */
        .track-section {
            overflow: hidden;
        }
        .track-grid {
            display: flex;
            gap: 20px;
            overflow-x: auto;
            padding-bottom: 16px;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
        }
        .track-grid::-webkit-scrollbar {
            height: 6px;
        }
        .track-grid::-webkit-scrollbar-track {
            background: var(--bg-secondary);
            border-radius: 3px;
        }
        .track-grid::-webkit-scrollbar-thumb {
            background: var(--metal-light);
            border-radius: 3px;
        }
        .track-card {
            min-width: 220px;
            max-width: 220px;
            scroll-snap-align: start;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
            position: relative;
        }
        .track-card:hover {
            border-color: var(--metal-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .track-thumb {
            height: 130px;
            overflow: hidden;
            position: relative;
        }
        .track-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .track-card:hover .track-thumb img {
            transform: scale(1.06);
        }
        .track-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.35);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: var(--transition);
        }
        .track-card:hover .track-overlay {
            opacity: 1;
        }
        .track-overlay-btn {
            background: var(--accent);
            color: #121417;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.85rem;
            border: none;
            cursor: pointer;
        }
        .track-info {
            padding: 14px 16px;
        }
        .track-title {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-primary);
            margin-bottom: 4px;
        }
        .track-meta {
            font-size: 0.78rem;
            color: var(--text-muted);
        }
        /* CTA */
        .cta-section {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .cta-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }
        .cta-text h2 {
            font-size: 1.7rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .cta-text p {
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        /* Footer */
        .site-footer {
            background: var(--bg-hero);
            border-top: 1px solid var(--border);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand i { color: var(--accent); }
        .footer-desc {
            color: var(--text-muted);
            font-size: 0.88rem;
            line-height: 1.7;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--text-primary);
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.88rem;
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover { color: var(--accent); }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-copy {
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .footer-links {
            display: flex;
            gap: 18px;
            flex-wrap: wrap;
        }
        .footer-links a {
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .footer-links a:hover { color: var(--accent); }
        /* FAB */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--bg-card);
            border: 2px solid var(--accent);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            cursor: pointer;
            transition: var(--transition);
            opacity: 0.7;
            box-shadow: 0 4px 20px rgba(232,184,75,0.3);
            animation: fabFloat 3s ease-in-out infinite;
        }
        .fab-left:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 20px rgba(232,184,75,0.5);
        }
        .fab-left:active {
            transform: scale(0.95);
        }
        .fab-notification {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 12px;
            height: 12px;
            background: #e74c3c;
            border-radius: 50%;
            animation: blink 1.4s infinite;
        }
        @keyframes fabFloat {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-6px); }
        }
        @keyframes blink {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.3; }
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .hero-grid { grid-template-columns: 1fr; gap: 32px; }
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .grid-3 { grid-template-columns: repeat(2, 1fr); }
            .membership-grid { grid-template-columns: repeat(2, 1fr); }
            .content-list { grid-template-columns: 1fr; }
            .subscribe-box { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .section-pad { padding: 48px 0; }
            .section-pad-sm { padding: 36px 0; }
            .section-title { font-size: 1.6rem; }
            .hero-title { font-size: 2rem; }
            .hero-section { padding: 72px 0 48px; }
            .nav-desktop { display: none; }
            .nav-actions .btn-nav-login,
            .nav-actions .btn-nav-signup { display: inline-block; }
            .nav-toggle { display: flex; }
            .mobile-menu.show { display: flex; }
            .grid-4 { grid-template-columns: 1fr 1fr; }
            .grid-3 { grid-template-columns: 1fr; }
            .grid-2 { grid-template-columns: 1fr; }
            .membership-grid { grid-template-columns: 1fr; }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .hero-actions .btn-primary,
            .hero-actions .btn-outline { width: 100%; justify-content: center; }
            .hero-stats { gap: 16px; }
            .footer-grid { grid-template-columns: 1fr; }
            .cta-inner { flex-direction: column; text-align: center; }
            .subscribe-form { flex-direction: column; }
            .track-card { min-width: 180px; max-width: 180px; }
            .fab-left { width: 46px; height: 46px; font-size: 1.2rem; left: 12px; bottom: 80px; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 14px; }
            .hero-title { font-size: 1.7rem; }
            .hero-desc { font-size: 0.95rem; }
            .grid-4 { grid-template-columns: 1fr; }
            .progress-ring-wrap { flex-direction: column; text-align: center; }
            .header-inner { min-height: 60px; }
            .brand { font-size: 0.95rem; }
            .btn-nav-login,
            .btn-nav-signup { padding: 6px 12px; font-size: 0.8rem; }
            .track-card { min-width: 160px; max-width: 160px; }
        }

/* roulang page: category1 */
:root {
            --bg-dark: #0A2E1C;
            --bg-forest: #123E25;
            --bg-deep: #071F12;
            --gold: #FFD700;
            --gold-dark: #C5A800;
            --red: #D32F2F;
            --mint: #D1F2EB;
            --white: #FFFFFF;
            --gray-soft: rgba(255,255,255,0.7);
            --gray-muted: rgba(255,255,255,0.5);
            --border-gold: rgba(255,215,0,0.35);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-card: 0 8px 30px rgba(0,0,0,0.45);
            --shadow-gold: 0 4px 20px rgba(255,215,0,0.25);
            --transition: all 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
            --font-primary: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        body {
            font-family: var(--font-primary);
            background-color: var(--bg-dark);
            color: var(--white);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
            transition: var(--transition);
        }
        
        button:focus-visible,
        a:focus-visible {
            outline: 3px solid var(--gold);
            outline-offset: 3px;
            border-radius: 4px;
        }
        
        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 24px;
        }
        
        /* ============ HEADER / NAV ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(7,31,18,0.95);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255,215,0,0.18);
            box-shadow: 0 4px 24px rgba(0,0,0,0.35);
        }
        
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 20px;
        }
        
        .brand {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
            font-size: 1.12rem;
            color: var(--gold);
            letter-spacing: 0.3px;
            white-space: nowrap;
            flex-shrink: 0;
        }
        
        .brand i {
            font-size: 1.6rem;
            color: var(--gold);
        }
        
        .brand span {
            color: var(--white);
            font-size: 0.95rem;
            font-weight: 600;
            line-height: 1.3;
        }
        
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        
        .nav-desktop a {
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--gray-soft);
            transition: var(--transition);
            white-space: nowrap;
        }
        
        .nav-desktop a:hover {
            color: var(--gold);
            background: rgba(255,215,0,0.08);
        }
        
        .nav-desktop a.active {
            background: var(--gold);
            color: var(--bg-deep);
            font-weight: 700;
            box-shadow: var(--shadow-gold);
        }
        
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        
        .btn-nav-login {
            padding: 9px 20px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--white);
            background: transparent;
            border: 1.5px solid rgba(255,255,255,0.3);
            transition: var(--transition);
        }
        
        .btn-nav-login:hover {
            border-color: var(--gold);
            color: var(--gold);
            background: rgba(255,215,0,0.05);
        }
        
        .btn-nav-signup {
            padding: 9px 22px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--bg-deep);
            background: linear-gradient(135deg, #FFE55C, #FFD700);
            box-shadow: var(--shadow-gold);
            transition: var(--transition);
        }
        
        .btn-nav-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(255,215,0,0.4);
        }
        
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(255,215,0,0.12);
            color: var(--gold);
            font-size: 1.3rem;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        
        .nav-toggle:hover {
            background: rgba(255,215,0,0.22);
        }
        
        .mobile-menu {
            display: none;
            flex-direction: column;
            gap: 6px;
            padding: 16px 0 20px;
            border-top: 1px solid rgba(255,215,0,0.15);
        }
        
        .mobile-menu a {
            padding: 12px 16px;
            border-radius: 10px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--gray-soft);
            transition: var(--transition);
        }
        
        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: rgba(255,215,0,0.1);
            color: var(--gold);
        }
        
        /* ============ HERO ============ */
        .hero-video {
            position: relative;
            min-height: 580px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            background: linear-gradient(135deg, #071F12 0%, #0A2E1C 50%, #123E25 100%);
            border-bottom: 2px solid rgba(255,215,0,0.2);
        }
        
        .hero-video-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.35;
            z-index: 0;
        }
        
        .hero-video-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(7,31,18,0.6) 0%, rgba(7,31,18,0.85) 100%);
            z-index: 1;
        }
        
        .hero-video-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
            padding: 60px 24px;
        }
        
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            border-radius: 30px;
            background: rgba(255,215,0,0.12);
            border: 1px solid rgba(255,215,0,0.3);
            color: var(--gold);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 24px;
        }
        
        .hero-video-content h1 {
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            font-weight: 800;
            line-height: 1.2;
            color: var(--white);
            margin-bottom: 18px;
            text-shadow: 0 4px 24px rgba(0,0,0,0.5);
        }
        
        .hero-video-content h1 .gold-text {
            color: var(--gold);
        }
        
        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--gray-soft);
            max-width: 650px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        
        .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        
        .btn-hero-play {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            padding: 16px 36px;
            border-radius: 50px;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--bg-deep);
            background: linear-gradient(135deg, #FFE55C, #FFD700);
            box-shadow: 0 8px 32px rgba(255,215,0,0.35);
            transition: var(--transition);
        }
        
        .btn-hero-play:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 40px rgba(255,215,0,0.5);
        }
        
        .btn-hero-play i {
            font-size: 1.3rem;
        }
        
        .btn-hero-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 32px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--white);
            background: transparent;
            border: 2px solid rgba(255,255,255,0.35);
            transition: var(--transition);
        }
        
        .btn-hero-outline:hover {
            border-color: var(--gold);
            color: var(--gold);
            background: rgba(255,215,0,0.06);
        }
        
        /* ============ FEATURES STRIP ============ */
        .features-strip {
            padding: 50px 0 30px;
            background: var(--bg-deep);
            border-bottom: 1px solid rgba(255,215,0,0.1);
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        
        .feature-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 18px 20px;
            background: rgba(255,255,255,0.03);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255,255,255,0.06);
            transition: var(--transition);
        }
        
        .feature-item:hover {
            background: rgba(255,215,0,0.05);
            border-color: rgba(255,215,0,0.2);
            transform: translateY(-2px);
        }
        
        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: rgba(255,215,0,0.1);
            color: var(--gold);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        
        .feature-text h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 2px;
        }
        
        .feature-text p {
            font-size: 0.82rem;
            color: var(--gray-muted);
            margin: 0;
        }
        
        /* ============ MAIN CONTENT SECTIONS ============ */
        .main-content {
            padding: 60px 0;
        }
        
        .section-block {
            margin-bottom: 70px;
        }
        
        .section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 20px;
            margin-bottom: 32px;
            flex-wrap: wrap;
        }
        
        .section-header-left h2 {
            font-size: clamp(1.6rem, 3vw, 2.3rem);
            font-weight: 800;
            color: var(--white);
            margin-bottom: 8px;
        }
        
        .section-header-left p {
            font-size: 1rem;
            color: var(--gray-soft);
            margin: 0;
        }
        
        .section-tag {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 30px;
            background: rgba(255,215,0,0.1);
            border: 1px solid rgba(255,215,0,0.25);
            color: var(--gold);
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 10px;
        }
        
        /* Category specific cards */
        .category-intro {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
            margin-bottom: 70px;
        }
        
        .category-intro-text h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 18px;
        }
        
        .category-intro-text p {
            font-size: 1.05rem;
            color: var(--gray-soft);
            line-height: 1.75;
            margin-bottom: 16px;
        }
        
        .category-intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 2px solid rgba(255,215,0,0.2);
            box-shadow: var(--shadow-card);
            position: relative;
        }
        
        .category-intro-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
        }
        
        .category-intro-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(7,31,18,0.4) 0%, transparent 50%);
        }
        
        /* Content cards grid */
        .content-cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        
        .content-card {
            background: rgba(255,255,255,0.03);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid rgba(255,255,255,0.08);
            transition: var(--transition);
        }
        
        .content-card:hover {
            transform: translateY(-6px);
            border-color: rgba(255,215,0,0.35);
            box-shadow: 0 14px 40px rgba(0,0,0,0.5);
        }
        
        .content-card-image {
            position: relative;
            height: 220px;
            overflow: hidden;
        }
        
        .content-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .content-card:hover .content-card-image img {
            transform: scale(1.06);
        }
        
        .content-card-badge {
            position: absolute;
            top: 14px;
            left: 14px;
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            background: var(--red);
            color: var(--white);
            z-index: 2;
        }
        
        .content-card-body {
            padding: 22px 24px 26px;
        }
        
        .content-card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        
        .content-card-body p {
            font-size: 0.9rem;
            color: var(--gray-soft);
            line-height: 1.6;
            margin-bottom: 16px;
        }
        
        .content-card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.82rem;
            color: var(--gray-muted);
        }
        
        .content-card-meta i {
            color: var(--gold);
            margin-right: 5px;
        }
        
        /* Process / Steps */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            counter-reset: step;
        }
        
        .process-step {
            position: relative;
            padding: 28px 26px;
            background: rgba(255,255,255,0.03);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255,255,255,0.06);
            counter-increment: step;
            transition: var(--transition);
        }
        
        .process-step:hover {
            border-color: rgba(255,215,0,0.3);
            background: rgba(255,215,0,0.04);
        }
        
        .process-step::before {
            content: counter(step, decimal-leading-zero);
            font-size: 2.8rem;
            font-weight: 800;
            color: rgba(255,215,0,0.25);
            display: block;
            margin-bottom: 12px;
            line-height: 1;
        }
        
        .process-step h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        
        .process-step p {
            font-size: 0.9rem;
            color: var(--gray-soft);
            line-height: 1.65;
            margin: 0;
        }
        
        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 860px;
        }
        
        .faq-item {
            background: rgba(255,255,255,0.03);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255,255,255,0.08);
            overflow: hidden;
            transition: var(--transition);
        }
        
        .faq-item:hover {
            border-color: rgba(255,215,0,0.25);
        }
        
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 26px;
            font-size: 1rem;
            font-weight: 700;
            cursor: pointer;
            color: var(--white);
            transition: var(--transition);
            user-select: none;
        }
        
        .faq-question:hover {
            color: var(--gold);
        }
        
        .faq-question i {
            color: var(--gold);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 26px;
        }
        
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 26px 22px;
        }
        
        .faq-answer p {
            font-size: 0.92rem;
            color: var(--gray-soft);
            line-height: 1.7;
            margin: 0;
        }
        
        /* CTA */
        .cta-section {
            padding: 70px 0;
            background: linear-gradient(135deg, #0A2E1C 0%, #123E25 50%, #071F12 100%);
            border-radius: var(--radius-lg);
            text-align: center;
            border: 1px solid rgba(255,215,0,0.25);
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-3.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
        }
        
        .cta-section > * {
            position: relative;
            z-index: 1;
        }
        
        .cta-section h2 {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            font-weight: 800;
            margin-bottom: 14px;
        }
        
        .cta-section p {
            font-size: 1.05rem;
            color: var(--gray-soft);
            max-width: 600px;
            margin: 0 auto 30px;
            line-height: 1.7;
        }
        
        .btn-cta-gold {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            border-radius: 50px;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--bg-deep);
            background: linear-gradient(135deg, #FFE55C, #FFD700);
            box-shadow: 0 8px 32px rgba(255,215,0,0.35);
            transition: var(--transition);
        }
        
        .btn-cta-gold:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 44px rgba(255,215,0,0.5);
        }
        
        /* ============ FOOTER ============ */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid rgba(255,215,0,0.18);
            padding: 60px 0 30px;
            margin-top: 70px;
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--gold);
            margin-bottom: 16px;
        }
        
        .footer-brand i {
            font-size: 1.5rem;
        }
        
        .footer-desc {
            font-size: 0.9rem;
            color: var(--gray-muted);
            line-height: 1.7;
            margin: 0;
        }
        
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 16px;
        }
        
        .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: var(--gray-muted);
            margin-bottom: 10px;
            transition: var(--transition);
        }
        
        .footer-col a:hover {
            color: var(--gold);
            padding-left: 4px;
        }
        
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            padding-top: 24px;
            border-top: 1px solid rgba(255,255,255,0.08);
            flex-wrap: wrap;
        }
        
        .footer-copy {
            font-size: 0.82rem;
            color: var(--gray-muted);
        }
        
        .footer-links {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .footer-links a {
            font-size: 0.82rem;
            color: var(--gray-muted);
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--gold);
        }
        
        /* ============ FAB ============ */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 60;
            width: 58px;
            height: 58px;
            border-radius: 50%;
            background: radial-gradient(circle at 30% 30%, #2A2A2A, #0D0D0D);
            border: 2px solid var(--gold);
            color: var(--gold);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 4px 20px rgba(255,215,0,0.3);
            cursor: pointer;
            opacity: 0.7;
            transition: var(--transition);
            animation: fabFloat 3s ease-in-out infinite;
        }
        
        .fab-left:hover {
            opacity: 1;
            transform: scale(1.12);
            box-shadow: 0 8px 32px rgba(255,215,0,0.5);
        }
        
        .fab-left:active {
            transform: scale(0.94);
        }
        
        .fab-notification {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: #E53935;
            border: 2px solid var(--bg-deep);
            animation: blinkDot 1.6s ease-in-out infinite;
        }
        
        @keyframes fabFloat {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-7px); }
        }
        
        @keyframes blinkDot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.25; }
        }
        
        /* ============ RESPONSIVE ============ */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .content-cards-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .category-intro {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            
            .nav-toggle {
                display: flex;
            }
            
            .mobile-menu {
                display: flex;
            }
            
            .brand span {
                font-size: 0.8rem;
                max-width: 180px;
                overflow: hidden;
                text-overflow: ellipsis;
                white-space: nowrap;
            }
            
            .hero-video {
                min-height: 480px;
            }
            
            .hero-video-content h1 {
                font-size: 2rem;
            }
            
            .process-grid {
                grid-template-columns: 1fr;
            }
            
            .content-cards-grid {
                grid-template-columns: 1fr;
            }
            
            .features-grid {
                grid-template-columns: 1fr;
            }
            
            .section-header {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            
            .header-inner {
                min-height: 64px;
                gap: 10px;
            }
            
            .brand i {
                font-size: 1.3rem;
            }
            
            .brand span {
                font-size: 0.7rem;
                max-width: 120px;
            }
            
            .btn-nav-login,
            .btn-nav-signup {
                padding: 7px 14px;
                font-size: 0.78rem;
            }
            
            .hero-video {
                min-height: 420px;
            }
            
            .hero-video-content h1 {
                font-size: 1.7rem;
            }
            
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            
            .btn-hero-play,
            .btn-hero-outline {
                width: 100%;
                justify-content: center;
            }
            
            .content-card-image {
                height: 180px;
            }
            
            .faq-question {
                padding: 16px 18px;
                font-size: 0.9rem;
            }
            
            .fab-left {
                width: 50px;
                height: 50px;
                font-size: 1.2rem;
                left: 10px;
                bottom: 80px;
            }
        }

/* roulang page: article */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: #121826;
            --bg-elevated: #1A2235;
            --accent-cyan: #00F0FF;
            --accent-blue: #0052FF;
            --accent-hotpink: #FF007F;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8B9BB4;
            --border-dark: #1E293B;
            --border-neon: rgba(0, 240, 255, 0.35);
            --border-neon-strong: rgba(0, 240, 255, 0.8);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.35);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --font-primary: 'Be Vietnam Pro', 'Inter', sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --transition-smooth: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

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

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

        body {
            font-family: var(--font-primary);
            background: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.65;
            font-size: 16px;
            overflow-x: hidden;
            min-height: 100vh;
        }

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

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 3px;
            border-radius: 4px;
        }

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

        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header */
        .site-header {
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-dark);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: box-shadow var(--transition-smooth);
        }

        .site-header.scrolled {
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.55);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
            gap: 20px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 800;
            font-size: 1.15rem;
            color: var(--text-white);
            letter-spacing: -0.01em;
            max-width: 380px;
            line-height: 1.3;
        }

        .brand i {
            color: var(--accent-cyan);
            font-size: 1.8rem;
            filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.5));
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }

        .nav-desktop a {
            padding: 8px 16px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-silver);
            border-radius: 8px;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

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

        .nav-desktop a.active {
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.12);
            box-shadow: inset 0 0 0 1px var(--border-neon);
        }

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

        .btn-nav-login,
        .btn-nav-signup {
            font-family: var(--font-primary);
            font-size: 0.85rem;
            font-weight: 700;
            padding: 9px 18px;
            border-radius: 8px;
            cursor: pointer;
            transition: all var(--transition-fast);
            border: none;
            white-space: nowrap;
        }

        .btn-nav-login {
            background: transparent;
            color: var(--text-silver);
            border: 1px solid var(--border-dark);
        }

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

        .btn-nav-signup {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #FFFFFF;
            box-shadow: 0 4px 16px rgba(0, 82, 255, 0.4);
        }

        .btn-nav-signup:hover {
            box-shadow: 0 6px 24px rgba(0, 240, 255, 0.5);
            transform: translateY(-1px);
        }

        .btn-nav-signup:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(0, 82, 255, 0.3);
        }

        .nav-toggle {
            display: none;
            background: transparent;
            border: 1px solid var(--border-dark);
            color: var(--text-white);
            font-size: 1.2rem;
            padding: 8px 12px;
            border-radius: 8px;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

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

        .mobile-menu {
            display: none;
            flex-direction: column;
            padding: 16px 0;
            gap: 4px;
            border-top: 1px solid var(--border-dark);
        }

        .mobile-menu a {
            padding: 12px 16px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-silver);
            border-radius: 8px;
            transition: all var(--transition-fast);
        }

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

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

        /* Article Layout */
        .article-page {
            padding: 50px 0 70px;
            background: var(--bg-primary);
        }

        .article-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 320px;
            gap: 40px;
            align-items: start;
        }

        .article-main {
            min-width: 0;
        }

        .article-card {
            background: var(--bg-card);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .article-cover {
            position: relative;
            aspect-ratio: 21/9;
            overflow: hidden;
            background: var(--bg-elevated);
        }

        .article-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .article-cover:hover img {
            transform: scale(1.03);
        }

        .article-cover::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(8, 9, 15, 0.75), transparent 55%);
            pointer-events: none;
        }

        .article-category-badge {
            position: absolute;
            top: 20px;
            left: 20px;
            z-index: 2;
            background: rgba(0, 240, 255, 0.18);
            backdrop-filter: blur(8px);
            border: 1px solid var(--border-neon);
            color: var(--accent-cyan);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.02em;
        }

        .article-body {
            padding: 35px 40px 45px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            margin-bottom: 18px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .article-meta i {
            color: var(--accent-cyan);
            margin-right: 6px;
        }

        .article-title {
            font-size: 2rem;
            font-weight: 900;
            line-height: 1.25;
            letter-spacing: -0.01em;
            margin-bottom: 20px;
            color: var(--text-white);
        }

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

        .article-content h2 {
            font-size: 1.55rem;
            font-weight: 800;
            color: var(--text-white);
            margin: 30px 0 16px;
            line-height: 1.35;
        }

        .article-content h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-white);
            margin: 24px 0 12px;
            line-height: 1.4;
        }

        .article-content p {
            margin-bottom: 18px;
        }

        .article-content ul,
        .article-content ol {
            margin: 0 0 20px 24px;
            color: var(--text-silver);
        }

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

        .article-content strong {
            color: var(--text-white);
            font-weight: 700;
        }

        .article-content a {
            color: var(--accent-cyan);
            border-bottom: 1px solid rgba(0, 240, 255, 0.4);
        }

        .article-content a:hover {
            color: #66F7FF;
            border-bottom-color: #66F7FF;
        }

        .article-content img {
            border-radius: var(--radius-md);
            margin: 20px 0;
            border: 1px solid var(--border-dark);
        }

        .article-content blockquote {
            border-left: 4px solid var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
            padding: 18px 22px;
            margin: 22px 0;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            color: var(--text-silver);
            font-style: italic;
        }

        .article-not-found {
            text-align: center;
            padding: 60px 20px;
        }

        .article-not-found i {
            font-size: 3.5rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .article-not-found h2 {
            font-size: 1.6rem;
            font-weight: 800;
            margin-bottom: 12px;
        }

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

        /* Sidebar */
        .article-sidebar {
            position: sticky;
            top: 92px;
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .sidebar-widget {
            background: var(--bg-card);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-card);
        }

        .sidebar-widget h3 {
            font-size: 1.05rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-white);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .sidebar-widget h3 i {
            color: var(--accent-cyan);
        }

        .sidebar-category-list {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .sidebar-category-list a {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 14px;
            background: var(--bg-elevated);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-sm);
            color: var(--text-silver);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
        }

        .sidebar-category-list a:hover {
            border-color: var(--border-neon);
            color: var(--accent-cyan);
            transform: translateX(4px);
        }

        .sidebar-category-list a span {
            background: rgba(0, 240, 255, 0.12);
            color: var(--accent-cyan);
            padding: 2px 10px;
            border-radius: 12px;
            font-size: 0.75rem;
            font-weight: 700;
        }

        .sidebar-promo {
            background: linear-gradient(145deg, var(--bg-elevated), var(--bg-card));
            border: 1px solid var(--border-neon);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: left;
        }

        .sidebar-promo h4 {
            font-size: 1.1rem;
            font-weight: 800;
            margin-bottom: 10px;
            color: var(--text-white);
        }

        .sidebar-promo p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            line-height: 1.6;
        }

        .sidebar-promo img {
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
            border: 1px solid var(--border-dark);
        }

        .btn-sidebar-promo {
            display: inline-block;
            width: 100%;
            text-align: center;
            padding: 12px 20px;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #FFFFFF;
            font-weight: 700;
            font-size: 0.9rem;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .btn-sidebar-promo:hover {
            box-shadow: var(--shadow-neon);
            transform: translateY(-2px);
        }

        /* CTA Section */
        .article-cta {
            margin-top: 50px;
            background: linear-gradient(145deg, var(--bg-elevated), var(--bg-card));
            border: 1px solid var(--border-neon);
            border-radius: var(--radius-lg);
            padding: 45px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 30px;
            flex-wrap: wrap;
        }

        .article-cta-content {
            flex: 1;
            min-width: 260px;
        }

        .article-cta-content h2 {
            font-size: 1.6rem;
            font-weight: 900;
            margin-bottom: 12px;
            line-height: 1.3;
        }

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

        .btn-cta-primary {
            display: inline-block;
            padding: 14px 30px;
            background: linear-gradient(135deg, var(--accent-hotpink), var(--accent-blue));
            color: #FFFFFF;
            font-weight: 800;
            font-size: 0.95rem;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
            box-shadow: 0 6px 20px rgba(255, 0, 127, 0.35);
            white-space: nowrap;
        }

        .btn-cta-primary:hover {
            box-shadow: 0 8px 28px rgba(0, 240, 255, 0.45);
            transform: translateY(-2px);
        }

        .btn-cta-primary:active {
            transform: translateY(0);
            box-shadow: 0 3px 10px rgba(255, 0, 127, 0.25);
        }

        /* FAB */
        .fab-floating {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 90;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.75);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(8, 9, 15, 0.75), rgba(8, 9, 15, 0.75)), linear-gradient(135deg, var(--accent-cyan), var(--accent-hotpink));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0.65;
            transition: all var(--transition-smooth);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.25);
            animation: fabPulse 3s ease-in-out infinite;
        }

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

        .fab-floating:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.5);
        }

        .fab-floating:hover i {
            transform: scale(1.15);
        }

        .fab-floating:active {
            transform: scale(0.92);
            border-color: var(--accent-hotpink);
        }

        .fab-notification {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 16px;
            height: 16px;
            background: var(--accent-hotpink);
            border-radius: 50%;
            border: 2px solid var(--bg-primary);
            animation: fabBlink 1.8s ease-in-out infinite;
        }

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

        @keyframes fabBlink {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.35; }
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-dark);
            padding: 55px 0 25px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.05rem;
            color: var(--text-white);
            margin-bottom: 14px;
        }

        .footer-brand i {
            color: var(--accent-cyan);
            font-size: 1.5rem;
            filter: drop-shadow(0 0 6px rgba(0, 240, 255, 0.5));
        }

        .footer-desc {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 360px;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }

        .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            padding-top: 22px;
            border-top: 1px solid var(--border-dark);
        }

        .footer-copy {
            font-size: 0.82rem;
            color: var(--text-muted);
        }

        .footer-links {
            display: flex;
            gap: 22px;
            flex-wrap: wrap;
        }

        .footer-links a {
            font-size: 0.82rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

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

        /* Responsive */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .article-sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }

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

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

            .nav-toggle {
                display: block;
            }

            .brand {
                font-size: 1rem;
                max-width: 240px;
            }

            .brand i {
                font-size: 1.4rem;
            }

            .btn-nav-login,
            .btn-nav-signup {
                padding: 7px 13px;
                font-size: 0.8rem;
            }

            .article-body {
                padding: 25px 22px 35px;
            }

            .article-title {
                font-size: 1.55rem;
            }

            .article-content {
                font-size: 0.98rem;
            }

            .article-cover {
                aspect-ratio: 16/9;
            }

            .article-cta {
                padding: 30px 24px;
                flex-direction: column;
                text-align: left;
                align-items: flex-start;
            }

            .article-sidebar {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 25px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                align-items: center;
            }

            .fab-floating {
                width: 48px;
                height: 48px;
                left: 12px;
                bottom: 80px;
            }

            .fab-floating i {
                font-size: 1.25rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }

            .header-inner {
                min-height: 60px;
                gap: 10px;
            }

            .brand {
                font-size: 0.85rem;
                gap: 8px;
                max-width: 180px;
            }

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

            .btn-nav-login,
            .btn-nav-signup {
                padding: 6px 10px;
                font-size: 0.75rem;
            }

            .article-page {
                padding: 30px 0 50px;
            }

            .article-body {
                padding: 20px 16px 28px;
            }

            .article-title {
                font-size: 1.35rem;
            }

            .article-category-badge {
                top: 12px;
                left: 12px;
                font-size: 0.7rem;
                padding: 4px 12px;
            }

            .article-cta-content h2 {
                font-size: 1.3rem;
            }

            .btn-cta-primary {
                padding: 12px 24px;
                font-size: 0.9rem;
                width: 100%;
                text-align: center;
            }
        }

/* roulang page: category2 */
:root {
            --primary-bg: #0B1A30;
            --secondary-bg: #0F0C20;
            --card-bg: #121A2E;
            --accent-lime: #CCFF00;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #A6ACAF;
            --border-dark: #1E2A3D;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-card: 0 8px 24px rgba(0,0,0,0.35);
            --shadow-neon: 0 0 15px rgba(0,240,255,0.5);
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.35s cubic-bezier(0.4,0,0.2,1);
            --font-body: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
        }

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

        body {
            font-family: var(--font-body);
            background-color: var(--primary-bg);
            color: var(--text-white);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

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

        button, .button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
            transition: all var(--transition-fast);
        }

        button:focus-visible, a:focus-visible {
            outline: 2px solid var(--accent-lime);
            outline-offset: 3px;
        }

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

        /* ========== HEADER / NAV ========== */
        .site-header {
            background-color: rgba(11, 26, 48, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-dark);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
            gap: 20px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-white);
            font-weight: 700;
            font-size: 15px;
            line-height: 1.3;
            flex-shrink: 0;
        }

        .brand i {
            color: var(--accent-lime);
            font-size: 26px;
        }

        .brand span {
            max-width: 280px;
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-desktop a {
            color: var(--text-silver);
            font-weight: 500;
            font-size: 15px;
            padding: 8px 0;
            position: relative;
            white-space: nowrap;
        }

        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-lime);
            transition: width var(--transition-smooth);
        }

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

        .nav-desktop a:hover,
        .nav-desktop a.active {
            color: var(--accent-lime);
        }

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

        .btn-nav-login {
            background: transparent;
            color: var(--text-white);
            font-weight: 600;
            font-size: 14px;
            padding: 10px 16px;
            border: 1px solid transparent;
        }

        .btn-nav-login:hover {
            color: var(--accent-lime);
            border-color: rgba(204,255,0,0.4);
            background: rgba(204,255,0,0.05);
        }

        .btn-nav-signup {
            background: var(--accent-lime);
            color: var(--secondary-bg);
            font-weight: 700;
            font-size: 14px;
            padding: 11px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 4px 14px rgba(204,255,0,0.25);
        }

        .btn-nav-signup:hover {
            background: #D9FF33;
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(204,255,0,0.4);
        }

        .nav-toggle {
            display: none;
            background: transparent;
            color: var(--text-white);
            font-size: 24px;
            padding: 8px;
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-sm);
        }

        .mobile-menu {
            display: none;
            padding: 16px 0 20px;
            border-top: 1px solid var(--border-dark);
        }

        .mobile-menu a {
            display: block;
            padding: 12px 8px;
            color: var(--text-silver);
            font-weight: 500;
            font-size: 15px;
            border-bottom: 1px solid rgba(30,42,61,0.6);
        }

        .mobile-menu a.active,
        .mobile-menu a:hover {
            color: var(--accent-lime);
        }

        /* ========== PAGE BANNER ========== */
        .page-banner {
            padding: 150px 0 70px;
            background: linear-gradient(135deg, #0B1A30 0%, #0F0C20 100%);
            position: relative;
            overflow: hidden;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-2.jpg') center/cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }

        .page-banner .container {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-silver);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-silver);
        }

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

        .breadcrumb i {
            font-size: 10px;
            color: var(--accent-cyan);
        }

        .page-banner h1 {
            font-size: 40px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-white);
        }

        .page-banner .subtitle {
            font-size: 18px;
            color: var(--text-silver);
            max-width: 700px;
            line-height: 1.6;
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: 70px 0;
        }

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

        .section-title {
            font-size: 30px;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.3;
            color: var(--text-white);
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-silver);
            margin-bottom: 40px;
            line-height: 1.6;
            max-width: 720px;
        }

        /* ========== HERO COUPON WALL ========== */
        .coupon-hero {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 50px;
            align-items: center;
            padding: 30px 0 10px;
        }

        .coupon-hero-content h2 {
            font-size: 36px;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 18px;
        }

        .coupon-hero-content p {
            font-size: 17px;
            color: var(--text-silver);
            line-height: 1.7;
            margin-bottom: 28px;
        }

        .btn-claim-coupon {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent-cyan);
            color: var(--secondary-bg);
            font-weight: 700;
            font-size: 16px;
            padding: 16px 32px;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-neon);
            transition: all var(--transition-smooth);
        }

        .btn-claim-coupon:hover {
            background: var(--accent-lime);
            transform: translateY(-2px);
            box-shadow: 0 0 25px rgba(204,255,0,0.6);
        }

        .coupon-card-large {
            background: var(--card-bg);
            border: 2px solid var(--accent-lime);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            text-align: center;
            box-shadow: 0 0 30px rgba(204,255,0,0.15);
            position: relative;
            overflow: hidden;
        }

        .coupon-card-large::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at center, rgba(204,255,0,0.06) 0%, transparent 60%);
            animation: pulse-glow 3s ease-in-out infinite;
        }

        @keyframes pulse-glow {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 1; }
        }

        .coupon-tag {
            display: inline-block;
            background: var(--accent-lime);
            color: var(--secondary-bg);
            font-weight: 700;
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 1px;
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 18px;
        }

        .coupon-amount {
            font-size: 52px;
            font-weight: 800;
            color: var(--accent-lime);
            line-height: 1.1;
            margin-bottom: 8px;
        }

        .coupon-label {
            font-size: 18px;
            color: var(--text-white);
            font-weight: 600;
            margin-bottom: 20px;
        }

        .coupon-code-box {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            background: rgba(0,240,255,0.08);
            border: 1px dashed var(--accent-cyan);
            border-radius: var(--radius-sm);
            padding: 12px 20px;
            margin-bottom: 16px;
        }

        .coupon-code-box code {
            font-size: 20px;
            font-weight: 700;
            color: var(--accent-cyan);
            letter-spacing: 2px;
        }

        .coupon-code-box button {
            background: transparent;
            color: var(--accent-lime);
            font-size: 18px;
            padding: 4px 8px;
        }

        .coupon-expiry {
            font-size: 13px;
            color: var(--text-silver);
        }

        /* ========== COUPON WALL GRID ========== */
        .coupon-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 40px;
        }

        .coupon-mini {
            background: var(--card-bg);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            text-align: center;
            transition: all var(--transition-smooth);
        }

        .coupon-mini:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0,240,255,0.2);
            transform: translateY(-4px);
        }

        .coupon-mini .mini-amount {
            font-size: 32px;
            font-weight: 800;
            color: var(--accent-lime);
            margin-bottom: 6px;
        }

        .coupon-mini .mini-label {
            font-size: 15px;
            color: var(--text-white);
            font-weight: 600;
            margin-bottom: 12px;
        }

        .btn-mini-claim {
            background: transparent;
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 13px;
            padding: 8px 16px;
            border: 1px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
        }

        .btn-mini-claim:hover {
            background: var(--accent-cyan);
            color: var(--secondary-bg);
        }

        /* ========== CONTENT CATEGORY SECTION ========== */
        .category-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 36px;
        }

        .tab-btn {
            background: transparent;
            color: var(--text-silver);
            font-weight: 600;
            font-size: 14px;
            padding: 10px 20px;
            border: 1px solid var(--border-dark);
            border-radius: 25px;
            transition: all var(--transition-fast);
        }

        .tab-btn:hover,
        .tab-btn.active {
            background: var(--accent-lime);
            color: var(--secondary-bg);
            border-color: var(--accent-lime);
        }

        .content-card-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .content-card {
            display: flex;
            gap: 20px;
            background: var(--card-bg);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 20px;
            transition: all var(--transition-smooth);
        }

        .content-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0,240,255,0.15);
            transform: translateY(-3px);
        }

        .content-card-img {
            width: 140px;
            height: 160px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--border-dark);
        }

        .content-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

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

        .content-card-body h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
            color: var(--text-white);
        }

        .content-card-body p {
            font-size: 14px;
            color: var(--text-silver);
            line-height: 1.6;
            margin-bottom: 12px;
            flex-grow: 1;
        }

        .content-card-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 12px;
            color: var(--text-silver);
        }

        .content-card-meta i {
            color: var(--accent-cyan);
        }

        .badge-hot {
            display: inline-block;
            background: #D32F2F;
            color: #fff;
            font-size: 11px;
            font-weight: 700;
            padding: 3px 10px;
            border-radius: 12px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        /* ========== FEATURE LIST ========== */
        .feature-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .feature-item {
            padding: 24px;
            border-left: 3px solid var(--accent-lime);
            background: rgba(255,255,255,0.02);
        }

        .feature-item .feature-icon {
            font-size: 30px;
            color: var(--accent-lime);
            margin-bottom: 14px;
        }

        .feature-item h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-white);
        }

        .feature-item p {
            font-size: 14px;
            color: var(--text-silver);
            line-height: 1.6;
        }

        /* ========== STATS BAR ========== */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            background: var(--card-bg);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 30px;
            margin-top: 40px;
        }

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

        .stat-item .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: var(--accent-lime);
            line-height: 1.1;
        }

        .stat-item .stat-label {
            font-size: 13px;
            color: var(--text-silver);
            margin-top: 6px;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 800px;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-dark);
            margin-bottom: 8px;
        }

        .faq-question {
            width: 100%;
            background: transparent;
            color: var(--text-white);
            font-size: 17px;
            font-weight: 600;
            padding: 20px 0;
            text-align: left;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }

        .faq-question i {
            color: var(--accent-cyan);
            transition: transform var(--transition-fast);
            font-size: 16px;
            flex-shrink: 0;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth);
        }

        .faq-answer.active {
            max-height: 300px;
        }

        .faq-answer p {
            padding: 0 0 20px;
            color: var(--text-silver);
            font-size: 15px;
            line-height: 1.7;
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--accent-lime) 0%, #D9FF33 100%);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: center;
            color: var(--secondary-bg);
        }

        .cta-section h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 14px;
            color: var(--secondary-bg);
        }

        .cta-section p {
            font-size: 17px;
            margin-bottom: 28px;
            color: rgba(15,12,32,0.8);
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.6;
        }

        .btn-cta-primary {
            display: inline-block;
            background: var(--secondary-bg);
            color: var(--accent-lime);
            font-weight: 700;
            font-size: 17px;
            padding: 16px 36px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-smooth);
        }

        .btn-cta-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(15,12,32,0.3);
            color: #fff;
        }

        /* ========== FAB ========== */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 999;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(11, 26, 48, 0.7);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 24px;
            box-shadow: var(--shadow-neon);
            transition: all var(--transition-smooth);
            opacity: 0.6;
            cursor: pointer;
        }

        .fab-left:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(0,240,255,0.7);
        }

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

        .fab-notification {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 16px;
            height: 16px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid var(--primary-bg);
            animation: blink-neon 1.5s ease-in-out infinite;
        }

        @keyframes blink-neon {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.2; }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background-color: var(--secondary-bg);
            border-top: 1px solid var(--border-dark);
            padding: 60px 0 0;
            margin-top: 20px;
        }

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

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 16px;
            color: var(--text-white);
            margin-bottom: 16px;
        }

        .footer-brand i {
            color: var(--accent-lime);
            font-size: 22px;
        }

        .footer-desc {
            font-size: 14px;
            color: var(--text-silver);
            line-height: 1.7;
            max-width: 400px;
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: var(--text-silver);
            font-size: 14px;
            margin-bottom: 10px;
            transition: color var(--transition-fast);
        }

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

        .footer-bottom {
            border-top: 1px solid var(--border-dark);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-copy {
            font-size: 13px;
            color: var(--text-silver);
        }

        .footer-links {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .footer-links a {
            font-size: 13px;
            color: var(--text-silver);
        }

        .footer-links a:hover {
            color: var(--accent-lime);
        }

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

            .coupon-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .feature-list {
                grid-template-columns: repeat(2, 1fr);
            }

            .stats-bar {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }

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

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

            .nav-toggle {
                display: block;
            }

            .mobile-menu {
                display: block;
            }

            .brand span {
                max-width: 180px;
                font-size: 13px;
            }

            .btn-nav-login,
            .btn-nav-signup {
                padding: 8px 14px;
                font-size: 13px;
            }

            .page-banner {
                padding: 120px 0 50px;
            }

            .page-banner h1 {
                font-size: 30px;
            }

            .coupon-hero-content h2 {
                font-size: 28px;
            }

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

            .content-card-grid {
                grid-template-columns: 1fr;
            }

            .content-card {
                flex-direction: column;
            }

            .content-card-img {
                width: 100%;
                height: 180px;
            }

            .feature-list {
                grid-template-columns: 1fr;
            }

            .stats-bar {
                grid-template-columns: 1fr 1fr;
                padding: 20px;
            }

            .stat-item .stat-number {
                font-size: 28px;
            }

            .cta-section {
                padding: 40px 24px;
            }

            .cta-section h2 {
                font-size: 26px;
            }

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

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .fab-left {
                width: 48px;
                height: 48px;
                font-size: 20px;
                left: 12px;
                bottom: 80px;
            }
        }

        @media (max-width: 520px) {
            .brand span {
                max-width: 130px;
                font-size: 11px;
            }

            .brand i {
                font-size: 20px;
            }

            .btn-nav-login {
                display: none;
            }

            .btn-nav-signup {
                padding: 8px 12px;
                font-size: 12px;
            }

            .header-inner {
                height: 60px;
                gap: 10px;
            }

            .page-banner h1 {
                font-size: 24px;
            }

            .coupon-amount {
                font-size: 40px;
            }

            .coupon-card-large {
                padding: 24px 18px;
            }

            .stats-bar {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .coupon-mini .mini-amount {
                font-size: 26px;
            }

            .section {
                padding: 50px 0;
            }

            .section-title {
                font-size: 24px;
            }
        }