/* roulang page: index */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8E9BAB;
            --border-dim: #1E293B;
            --border-glow: #0052FF;
            --shadow-glow: 0 0 20px rgba(0, 82, 255, 0.3);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--bg-deep);
            color: var(--text-silver);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; display: block; }
        button { cursor: pointer; font-family: inherit; }

        /* Navigation */
        .nav-header {
            position: fixed; top: 0; left: 0; width: 100%;
            background: rgba(8, 9, 15, 0.92); backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-dim);
            z-index: 1000; padding: 0 20px;
        }
        .nav-inner {
            max-width: 1320px; margin: 0 auto;
            display: flex; align-items: center; justify-content: space-between;
            height: 68px;
        }
        .logo-text {
            font-size: 1.25rem; font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.3px;
        }
        .nav-links { display: flex; align-items: center; gap: 34px; }
        .nav-links a {
            font-size: 0.92rem; font-weight: 500;
            color: var(--text-silver); transition: color 0.25s;
            position: relative; padding: 6px 0;
        }
        .nav-links a:hover, .nav-links a.active { color: var(--accent-cyan); }
        .nav-links a.active::after {
            content: ''; position: absolute; bottom: -2px; left: 0;
            width: 100%; height: 2px; background: var(--accent-cyan);
            border-radius: 2px;
        }
        .nav-cta-group { display: flex; align-items: center; gap: 12px; }
        .btn-login {
            background: transparent; border: 1px solid var(--text-silver);
            color: var(--text-silver); padding: 8px 22px;
            border-radius: 24px; font-size: 0.9rem; font-weight: 500;
            transition: all 0.3s;
        }
        .btn-login:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); }
        .btn-signup {
            background: var(--accent-blue); border: none;
            color: #fff; padding: 9px 26px; border-radius: 24px;
            font-size: 0.9rem; font-weight: 600;
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.45);
            transition: all 0.3s;
        }
        .btn-signup:hover { background: #1a67ff; box-shadow: 0 0 22px rgba(0, 240, 255, 0.55); transform: translateY(-1px); }
        .mobile-toggle { display: none; font-size: 1.6rem; color: var(--text-silver); background: none; border: none; }
        .mobile-menu { display: none; }

        /* Hero Video */
        .hero-video-section {
            position: relative; min-height: 92vh; overflow: hidden;
            display: flex; align-items: center; justify-content: center;
            margin-top: 0;
        }
        .hero-video-bg {
            position: absolute; top: 0; left: 0; width: 100%; height: 100%;
            object-fit: cover; z-index: 0; filter: brightness(0.45);
        }
        .hero-overlay {
            position: relative; z-index: 2; text-align: left; max-width: 860px;
            padding: 0 24px; margin-top: 40px;
        }
        .hero-play-btn {
            width: 78px; height: 78px; border-radius: 50%;
            background: rgba(0, 240, 255, 0.18); border: 2px solid var(--accent-cyan);
            display: flex; align-items: center; justify-content: center;
            font-size: 2rem; color: var(--accent-cyan);
            margin-bottom: 28px; transition: all 0.35s; cursor: pointer;
        }
        .hero-play-btn:hover { background: rgba(0, 240, 255, 0.3); box-shadow: 0 0 30px rgba(0, 240, 255, 0.6); transform: scale(1.06); }

        /* Containers */
        .section-pad { padding: 80px 20px; max-width: 1320px; margin: 0 auto; }
        .section-title { font-size: 2.2rem; font-weight: 700; color: var(--text-white); margin-bottom: 16px; letter-spacing: -0.5px; }
        .section-sub { font-size: 1.1rem; color: var(--text-muted); max-width: 720px; line-height: 1.7; margin-bottom: 48px; }

        /* Grid */
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 38px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

        /* Cards */
        .card-entry {
            background: var(--bg-card); border: 1px solid var(--border-dim);
            border-radius: var(--radius-md); padding: 32px 24px;
            transition: all 0.3s; position: relative; overflow: hidden;
        }
        .card-entry:hover { border-color: var(--accent-blue); box-shadow: var(--shadow-glow); transform: translateY(-4px); }
        .card-entry .icon-wrap {
            width: 52px; height: 52px; border-radius: var(--radius-sm);
            background: rgba(0, 82, 255, 0.15); display: flex; align-items: center; justify-content: center;
            font-size: 1.6rem; color: var(--accent-cyan); margin-bottom: 20px;
        }

        .resource-card {
            background: var(--bg-card); border-radius: var(--radius-md); overflow: hidden;
            border: 1px solid var(--border-dim); transition: all 0.3s;
        }
        .resource-card:hover { border-color: var(--accent-blue); box-shadow: var(--shadow-glow); }
        .resource-card img { width: 100%; height: 190px; object-fit: cover; }

        /* Filter Bar */
        .filter-bar {
            display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px;
        }
        .filter-chip {
            padding: 8px 22px; border-radius: 22px; border: 1px solid var(--border-dim);
            background: transparent; color: var(--text-silver); font-size: 0.9rem;
            transition: all 0.25s; cursor: pointer;
        }
        .filter-chip.active, .filter-chip:hover {
            background: var(--accent-blue); border-color: var(--accent-blue);
            color: #fff; box-shadow: 0 0 10px rgba(0, 82, 255, 0.4);
        }

        /* News List */
        .news-row { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 36px; }
        .news-list-item {
            display: flex; justify-content: space-between; align-items: center;
            padding: 18px 0; border-bottom: 1px solid var(--border-dim);
            transition: color 0.2s;
        }
        .news-list-item:hover { color: var(--accent-cyan); }
        .news-list-item .time { font-size: 0.82rem; color: var(--text-muted); white-space: nowrap; margin-left: 16px; }
        .news-side-card {
            background: var(--bg-card); border: 1px solid var(--border-dim);
            border-radius: var(--radius-md); padding: 22px;
        }

        /* Download Guide */
        .steps-vert { display: flex; flex-direction: column; gap: 28px; }
        .step-line {
            display: flex; gap: 22px; align-items: flex-start;
        }
        .step-num {
            width: 44px; height: 44px; border-radius: 50%;
            background: var(--accent-blue); color: #fff; font-weight: 700;
            display: flex; align-items: center; justify-content: center; flex-shrink: 0;
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.5);
        }

        /* FAB */
        .fab-left {
            position: fixed; left: 20px; bottom: 96px; z-index: 900;
            width: 52px; height: 52px; border-radius: 50px;
            background: rgba(13, 17, 30, 0.82); backdrop-filter: blur(12px);
            border: 1.5px solid transparent;
            background-clip: padding-box;
            display: flex; align-items: center; justify-content: center;
            color: var(--accent-cyan); font-size: 1.5rem;
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.45);
            transition: all 0.3s; cursor: pointer;
        }
        .fab-left:hover { transform: scale(1.12); box-shadow: 0 0 28px rgba(0, 240, 255, 0.7); }

        /* Footer */
        .site-footer {
            background: var(--bg-card); border-top: 1px solid var(--border-dim);
            padding: 44px 20px 28px; color: var(--text-muted);
        }
        .footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 36px; max-width: 1320px; margin: 0 auto 32px; }
        .footer-col h4 { color: var(--text-white); font-weight: 600; margin-bottom: 16px; }
        .footer-col a { display: block; color: var(--text-muted); margin-bottom: 10px; transition: color 0.2s; }
        .footer-col a:hover { color: var(--accent-cyan); }

        @media (max-width: 1024px) {
            .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .news-row { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .nav-links, .nav-cta-group { display: none; }
            .mobile-toggle { display: block; }
            .mobile-menu.active { display: flex; flex-direction: column; gap: 16px; padding: 20px 0; background: var(--bg-deep); border-top: 1px solid var(--border-dim); }
            .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
            .section-title { font-size: 1.8rem; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }

/* roulang page: article */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --bg-elevated: #121827;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8E9BAB;
            --border-dim: #1E293B;
            --border-glow: #0052FF;
            --shadow-glow: 0 0 20px rgba(0, 82, 255, 0.3);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
        }

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

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.25s ease;
        }

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

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

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

        .container {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Navigation */
        .nav-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-dim);
            z-index: 1000;
            padding: 0 20px;
            transition: all 0.3s ease;
        }

        .nav-inner {
            max-width: 1320px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 34px;
        }

        .nav-links a {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-silver);
            transition: color 0.25s;
            position: relative;
            padding: 6px 0;
            white-space: nowrap;
        }

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

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
            box-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
        }

        .nav-cta-group {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--text-silver);
            color: var(--text-silver);
            padding: 8px 22px;
            border-radius: 24px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s;
            white-space: nowrap;
        }

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

        .btn-signup {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            padding: 9px 26px;
            border-radius: 24px;
            font-size: 0.9rem;
            font-weight: 600;
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.45);
            transition: all 0.3s;
            white-space: nowrap;
        }

        .btn-signup:hover {
            background: #1a67ff;
            box-shadow: 0 0 22px rgba(0, 240, 255, 0.55);
            transform: translateY(-1px);
        }

        .mobile-toggle {
            display: none;
            font-size: 1.6rem;
            color: var(--text-silver);
            background: none;
            border: none;
            padding: 6px;
            line-height: 1;
        }

        .mobile-menu {
            display: none;
        }

        /* Article Layout */
        .article-wrapper {
            padding-top: 88px;
            min-height: 100vh;
        }

        .article-container {
            max-width: 960px;
            margin: 0 auto;
            padding: 40px 20px 60px;
        }

        .article-header {
            margin-bottom: 40px;
            text-align: left;
        }

        .article-category-tag {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 20px;
            background: rgba(0, 82, 255, 0.15);
            color: var(--accent-cyan);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 16px;
            border: 1px solid rgba(0, 240, 255, 0.2);
        }

        .article-h1 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--text-white);
            line-height: 1.3;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            color: var(--text-muted);
            font-size: 0.88rem;
            flex-wrap: wrap;
        }

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

        .article-meta i {
            color: var(--accent-cyan);
            font-size: 0.8rem;
        }

        .article-featured-img {
            width: 100%;
            border-radius: var(--radius-md);
            margin-bottom: 40px;
            border: 1px solid var(--border-dim);
            overflow: hidden;
        }

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

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

        .article-body h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-white);
            margin-top: 40px;
            margin-bottom: 16px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border-dim);
            letter-spacing: -0.3px;
        }

        .article-body h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: var(--text-white);
            margin-top: 32px;
            margin-bottom: 12px;
        }

        .article-body p {
            margin-bottom: 18px;
            text-align: justify;
        }

        .article-body ul,
        .article-body ol {
            margin-bottom: 18px;
            padding-left: 28px;
        }

        .article-body li {
            margin-bottom: 10px;
            position: relative;
        }

        .article-body ul li::marker {
            color: var(--accent-cyan);
        }

        .article-body a {
            color: var(--accent-cyan);
            font-weight: 500;
        }

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

        .article-body strong {
            color: var(--text-white);
            font-weight: 600;
        }

        .article-body blockquote {
            border-left: 4px solid var(--accent-blue);
            background: rgba(0, 82, 255, 0.06);
            padding: 18px 24px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 24px 0;
            font-style: italic;
            color: var(--text-silver);
        }

        .article-body .highlight-box {
            background: var(--bg-card);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            margin: 24px 0;
        }

        .article-body .highlight-box strong {
            display: block;
            margin-bottom: 8px;
            color: var(--accent-cyan);
        }

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

        .article-body table th {
            background: var(--accent-blue);
            color: var(--text-white);
            padding: 12px 16px;
            text-align: left;
            font-weight: 600;
        }

        .article-body table td {
            padding: 10px 16px;
            border-bottom: 1px solid var(--border-dim);
            color: var(--text-silver);
        }

        .article-body table tr:hover td {
            background: rgba(0, 82, 255, 0.05);
        }

        .article-cta-banner {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.15), rgba(0, 240, 255, 0.05));
            border: 1px solid var(--accent-blue);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            margin-top: 48px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }

        .article-cta-banner h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-white);
            margin: 0;
            flex: 1;
        }

        .article-cta-banner p {
            color: var(--text-muted);
            margin: 0;
            flex: 1;
            min-width: 240px;
        }

        .btn-cta-download {
            background: var(--accent-blue);
            color: #fff;
            padding: 14px 34px;
            border-radius: 24px;
            font-size: 1rem;
            font-weight: 600;
            box-shadow: 0 0 18px rgba(0, 82, 255, 0.5);
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }

        .btn-cta-download:hover {
            background: #1a67ff;
            box-shadow: 0 0 26px rgba(0, 240, 255, 0.65);
            transform: translateY(-2px);
        }

        .not-found-block {
            text-align: center;
            padding: 80px 20px;
            min-height: 50vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .not-found-block h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }

        .not-found-block p {
            color: var(--text-muted);
            font-size: 1.1rem;
            margin-bottom: 28px;
        }

        .btn-back-home {
            background: var(--accent-blue);
            color: #fff;
            padding: 12px 30px;
            border-radius: 24px;
            font-weight: 600;
            font-size: 0.95rem;
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.4);
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-back-home:hover {
            background: #1a67ff;
            box-shadow: 0 0 22px rgba(0, 240, 255, 0.55);
            transform: translateY(-2px);
        }

        /* Left FAB */
        .fab-left {
            position: fixed;
            left: 24px;
            bottom: 100px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 28px;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent-cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.35);
            transition: all 0.35s ease;
            cursor: pointer;
            opacity: 0.65;
            text-decoration: none;
            position: relative;
        }

        .fab-left::before {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: 30px;
            padding: 2px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            z-index: -1;
            animation: fab-border-flow 3s linear infinite;
        }

        @keyframes fab-border-flow {
            0% { filter: hue-rotate(0deg); }
            100% { filter: hue-rotate(360deg); }
        }

        .fab-left:hover {
            opacity: 1;
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.65);
            transform: scale(1.08);
            color: var(--text-white);
        }

        .fab-left:active {
            transform: scale(0.94);
        }

        .fab-notification-dot {
            position: absolute;
            top: 6px;
            right: 10px;
            width: 10px;
            height: 10px;
            background: #FF0055;
            border-radius: 50%;
            box-shadow: 0 0 8px rgba(255, 0, 85, 0.7);
            animation: blink-dot 1.6s ease-in-out infinite;
        }

        @keyframes blink-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.35; transform: scale(1.4); }
        }

        /* Footer */
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-dim);
            padding: 56px 20px 28px;
            margin-top: 0;
        }

        .footer-grid {
            max-width: 1320px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 36px;
            padding-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 18px;
            letter-spacing: -0.2px;
        }

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

        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 10px;
            transition: color 0.25s;
        }

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

        /* Responsive */
        @media (max-width: 1024px) {
            .article-h1 {
                font-size: 2rem;
            }
            .article-body h2 {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .mobile-menu {
                display: none;
                position: absolute;
                top: 68px;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                border-bottom: 1px solid var(--border-dim);
                padding: 16px 20px 24px;
                flex-direction: column;
                gap: 16px;
                z-index: 999;
            }
            .mobile-menu.show {
                display: flex;
            }
            .mobile-menu a {
                display: block;
                padding: 12px 16px;
                font-size: 0.95rem;
                font-weight: 500;
                color: var(--text-silver);
                border-radius: var(--radius-sm);
                transition: all 0.25s;
            }
            .mobile-menu a:hover,
            .mobile-menu a.active {
                background: rgba(0, 240, 255, 0.08);
                color: var(--accent-cyan);
            }
            .nav-cta-group {
                gap: 8px;
            }
            .btn-login {
                padding: 7px 16px;
                font-size: 0.82rem;
            }
            .btn-signup {
                padding: 7px 18px;
                font-size: 0.82rem;
            }
            .article-h1 {
                font-size: 1.7rem;
            }
            .article-body {
                font-size: 0.98rem;
            }
            .article-body h2 {
                font-size: 1.35rem;
            }
            .article-cta-banner {
                flex-direction: column;
                text-align: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .fab-left {
                left: 16px;
                bottom: 80px;
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
            }
        }

        @media (max-width: 520px) {
            .logo-text {
                font-size: 1rem;
            }
            .article-h1 {
                font-size: 1.4rem;
            }
            .article-body h2 {
                font-size: 1.2rem;
            }
            .btn-cta-download {
                width: 100%;
                justify-content: center;
            }
        }

/* roulang page: category2 */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8E9BAB;
            --border-dim: #1E293B;
            --border-glow: #0052FF;
            --shadow-glow: 0 0 20px rgba(0, 82, 255, 0.3);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--bg-deep);
            color: var(--text-silver);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; display: block; }
        button { cursor: pointer; font-family: inherit; }

        /* Navigation */
        .nav-header {
            position: fixed; top: 0; left: 0; width: 100%;
            background: rgba(8, 9, 15, 0.92); backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-dim);
            z-index: 1000; padding: 0 20px;
        }
        .nav-inner {
            max-width: 1320px; margin: 0 auto;
            display: flex; align-items: center; justify-content: space-between;
            height: 68px;
        }
        .logo-text {
            font-size: 1.25rem; font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.3px;
        }
        .nav-links { display: flex; align-items: center; gap: 34px; }
        .nav-links a {
            font-size: 0.92rem; font-weight: 500;
            color: var(--text-silver); transition: color 0.25s;
            position: relative; padding: 6px 0;
        }
        .nav-links a:hover, .nav-links a.active { color: var(--accent-cyan); }
        .nav-links a.active::after {
            content: ''; position: absolute; bottom: -2px; left: 0;
            width: 100%; height: 2px; background: var(--accent-cyan);
            border-radius: 2px;
        }
        .nav-cta-group { display: flex; align-items: center; gap: 12px; }
        .btn-login {
            background: transparent; border: 1px solid var(--text-silver);
            color: var(--text-silver); padding: 8px 22px;
            border-radius: 24px; font-size: 0.9rem; font-weight: 500;
            transition: all 0.3s;
        }
        .btn-login:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); }
        .btn-signup {
            background: var(--accent-blue); border: none;
            color: #fff; padding: 9px 26px; border-radius: 24px;
            font-size: 0.9rem; font-weight: 600;
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.45);
            transition: all 0.3s;
        }
        .btn-signup:hover { background: #1a67ff; box-shadow: 0 0 22px rgba(0, 240, 255, 0.55); transform: translateY(-1px); }
        .mobile-toggle { display: none; font-size: 1.6rem; color: var(--text-silver); background: none; border: none; }
        .mobile-menu { display: none; }

        /* Containers */
        .section-pad { padding: 80px 20px; max-width: 1320px; margin: 0 auto; }
        .section-title { font-size: 2.2rem; font-weight: 700; color: var(--text-white); margin-bottom: 16px; letter-spacing: -0.5px; }
        .section-sub { font-size: 1.1rem; color: var(--text-muted); max-width: 720px; line-height: 1.7; margin-bottom: 48px; }

        /* Grid */
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 38px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

        /* Cards */
        .card-entry {
            background: var(--bg-card); border: 1px solid var(--border-dim);
            border-radius: var(--radius-md); padding: 32px 24px;
            transition: all 0.3s; position: relative; overflow: hidden;
        }
        .card-entry:hover { border-color: var(--accent-blue); box-shadow: var(--shadow-glow); transform: translateY(-4px); }
        .card-entry .icon-wrap {
            width: 52px; height: 52px; border-radius: var(--radius-sm);
            background: rgba(0, 82, 255, 0.15); display: flex; align-items: center; justify-content: center;
            font-size: 1.6rem; color: var(--accent-cyan); margin-bottom: 20px;
        }

        /* Category page specific styles */
        .hero-category {
            background: linear-gradient(135deg, #0A0E1A 0%, #0D111E 100%);
            border-bottom: 1px solid var(--border-dim);
            padding: 120px 20px 80px;
            position: relative;
            overflow: hidden;
        }
        .hero-category::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at 30% 50%, rgba(0, 82, 255, 0.08) 0%, transparent 50%),
                        radial-gradient(circle at 70% 30%, rgba(0, 240, 255, 0.05) 0%, transparent 50%);
            pointer-events: none;
        }
        .countdown-timer {
            display: flex;
            gap: 16px;
            margin: 32px 0;
            flex-wrap: wrap;
        }
        .countdown-block {
            background: var(--bg-card);
            border: 1px solid var(--accent-blue);
            border-radius: var(--radius-md);
            padding: 18px 24px;
            text-align: center;
            min-width: 80px;
            box-shadow: 0 0 15px rgba(0, 82, 255, 0.2);
        }
        .countdown-block .number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--accent-cyan);
            line-height: 1.2;
        }
        .countdown-block .label {
            font-size: 0.8rem;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .step-list {
            list-style: none;
            padding: 0;
            counter-reset: step-counter;
        }
        .step-list li {
            counter-increment: step-counter;
            position: relative;
            padding: 24px 24px 24px 72px;
            margin-bottom: 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            transition: all 0.3s;
        }
        .step-list li:hover {
            border-color: var(--accent-blue);
            box-shadow: var(--shadow-glow);
        }
        .step-list li::before {
            content: counter(step-counter);
            position: absolute;
            left: 24px;
            top: 24px;
            width: 36px;
            height: 36px;
            background: var(--accent-blue);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
        }
        .download-card {
            background: var(--bg-card);
            border: 2px solid var(--border-dim);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            text-align: center;
            transition: all 0.3s;
            position: relative;
        }
        .download-card.featured {
            border-color: var(--accent-blue);
            box-shadow: 0 0 30px rgba(0, 82, 255, 0.25);
        }
        .download-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.3);
            transform: translateY(-6px);
        }
        .download-card .platform-icon {
            font-size: 3rem;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }
        .btn-download {
            display: inline-block;
            background: var(--accent-blue);
            color: #fff;
            padding: 14px 36px;
            border-radius: 28px;
            font-weight: 600;
            font-size: 1rem;
            box-shadow: 0 0 18px rgba(0, 82, 255, 0.4);
            transition: all 0.3s;
            margin-top: 16px;
        }
        .btn-download:hover {
            background: #1a67ff;
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.55);
            transform: translateY(-2px);
        }
        .alert-box {
            background: rgba(0, 240, 255, 0.08);
            border-left: 4px solid var(--accent-cyan);
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            margin: 28px 0;
        }
        .alert-box i {
            color: var(--accent-cyan);
            margin-right: 10px;
        }
        .table-compare {
            width: 100%;
            border-collapse: collapse;
            margin-top: 24px;
        }
        .table-compare th {
            background: var(--accent-blue);
            color: #fff;
            padding: 14px 16px;
            text-align: left;
            font-weight: 600;
        }
        .table-compare td {
            padding: 14px 16px;
            border-bottom: 1px solid var(--border-dim);
        }
        .table-compare tr:hover td {
            background: rgba(0, 82, 255, 0.05);
        }

        /* FAQ */
        .faq-item {
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            overflow: hidden;
            background: var(--bg-card);
            transition: all 0.3s;
        }
        .faq-item:hover {
            border-color: var(--accent-blue);
            box-shadow: 0 0 12px rgba(0, 82, 255, 0.2);
        }
        .faq-question {
            padding: 22px 28px;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-white);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }
        .faq-answer {
            padding: 0 28px 22px;
            color: var(--text-muted);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-question i {
            transition: transform 0.3s;
            color: var(--accent-cyan);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-dim);
            padding: 56px 20px 32px;
            margin-top: 80px;
        }
        .footer-grid {
            max-width: 1320px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 36px;
            padding-bottom: 32px;
        }
        .footer-col h4 {
            color: var(--text-white);
            font-weight: 600;
            margin-bottom: 16px;
            font-size: 1rem;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 10px;
            transition: color 0.25s;
        }
        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .grid-2 { grid-template-columns: 1fr; }
            .grid-3 { grid-template-columns: repeat(2, 1fr); }
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .countdown-timer { justify-content: center; }
        }
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .nav-cta-group .btn-login,
            .nav-cta-group .btn-signup {
                display: inline-block;
            }
            .mobile-toggle { display: inline-block; }
            .mobile-menu.show { display: flex; flex-direction: column; background: rgba(8, 9, 15, 0.98); padding: 16px 20px; position: fixed; top: 68px; left: 0; width: 100%; border-bottom: 1px solid var(--border-dim); z-index: 999; }
            .mobile-menu.show a { padding: 12px 0; color: var(--text-silver); font-weight: 500; border-bottom: 1px solid var(--border-dim); }
            .mobile-menu.show a:last-child { border-bottom: none; }
            .section-title { font-size: 1.6rem; }
            .grid-3, .grid-4 { grid-template-columns: 1fr; }
            .hero-category { padding: 100px 20px 50px; }
            .table-compare { font-size: 0.8rem; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; }
            .countdown-block { min-width: 60px; padding: 12px 14px; }
            .countdown-block .number { font-size: 1.8rem; }
            .btn-download { width: 100%; text-align: center; }
        }

/* roulang page: category1 */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8E9BAB;
            --border-dim: #1E293B;
            --border-glow: #0052FF;
            --shadow-glow: 0 0 20px rgba(0, 82, 255, 0.3);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--bg-deep);
            color: var(--text-silver);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            box-sizing: border-box;
        }
        *, *::before, *::after { box-sizing: border-box; }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; display: block; }
        button { cursor: pointer; font-family: inherit; }
        .container { max-width: 1320px; margin: 0 auto; padding: 0 20px; }

        /* Navigation */
        .nav-header {
            position: fixed; top: 0; left: 0; width: 100%;
            background: rgba(8, 9, 15, 0.92); backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-dim);
            z-index: 1000; padding: 0 20px;
        }
        .nav-inner {
            max-width: 1320px; margin: 0 auto;
            display: flex; align-items: center; justify-content: space-between;
            height: 68px;
        }
        .logo-text {
            font-size: 1.25rem; font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.3px;
        }
        .nav-links { display: flex; align-items: center; gap: 34px; }
        .nav-links a {
            font-size: 0.92rem; font-weight: 500;
            color: var(--text-silver); transition: color 0.25s;
            position: relative; padding: 6px 0;
        }
        .nav-links a:hover, .nav-links a.active { color: var(--accent-cyan); }
        .nav-links a.active::after {
            content: ''; position: absolute; bottom: -2px; left: 0;
            width: 100%; height: 2px; background: var(--accent-cyan);
            border-radius: 2px;
        }
        .nav-cta-group { display: flex; align-items: center; gap: 12px; }
        .btn-login {
            background: transparent; border: 1px solid var(--text-silver);
            color: var(--text-silver); padding: 8px 22px;
            border-radius: 24px; font-size: 0.9rem; font-weight: 500;
            transition: all 0.3s;
        }
        .btn-login:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); }
        .btn-signup {
            background: var(--accent-blue); border: none;
            color: #fff; padding: 9px 26px; border-radius: 24px;
            font-size: 0.9rem; font-weight: 600;
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.45);
            transition: all 0.3s;
        }
        .btn-signup:hover { background: #1a67ff; box-shadow: 0 0 22px rgba(0, 240, 255, 0.55); transform: translateY(-1px); }
        .mobile-toggle { display: none; font-size: 1.6rem; color: var(--text-silver); background: none; border: none; }
        .mobile-menu { display: none; }

        /* Page Header */
        .page-header {
            padding: 140px 20px 80px;
            background: linear-gradient(180deg, rgba(0,82,255,0.08) 0%, var(--bg-deep) 100%);
            border-bottom: 1px solid var(--border-dim);
            text-align: left;
        }
        .page-header h1 {
            font-size: 2.8rem; font-weight: 800; color: var(--text-white);
            letter-spacing: -0.8px; line-height: 1.25;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 100%);
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-header p {
            font-size: 1.2rem; color: var(--text-muted);
            max-width: 800px; line-height: 1.7;
        }

        /* Criteria Blocks */
        .criteria-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 60px;
            padding: 80px 20px;
        }
        .criteria-item {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            border: 1px solid var(--border-dim);
            transition: all 0.4s;
            position: relative;
            overflow: hidden;
        }
        .criteria-item:hover {
            border-color: var(--accent-blue);
            box-shadow: var(--shadow-glow);
        }
        .criteria-number {
            position: absolute;
            top: 20px;
            right: 30px;
            font-size: 6rem;
            font-weight: 900;
            color: rgba(0, 82, 255, 0.08);
            line-height: 1;
            z-index: 0;
        }
        .criteria-content {
            position: relative;
            z-index: 1;
        }
        .criteria-content h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 20px;
            letter-spacing: -0.4px;
        }
        .criteria-content p {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.75;
            margin-bottom: 24px;
        }
        .criteria-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .criteria-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 0;
            font-size: 0.98rem;
            color: var(--text-silver);
            border-bottom: 1px solid rgba(30, 41, 59, 0.5);
        }
        .criteria-list li i {
            color: var(--accent-cyan);
            font-size: 1.1rem;
            margin-top: 3px;
        }
        .criteria-img {
            position: relative;
            z-index: 1;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }
        .criteria-img img {
            width: 100%;
            height: 340px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .criteria-item:hover .criteria-img img {
            transform: scale(1.04);
        }
        .badge-trust {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--accent-cyan);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 20px;
        }

        /* Stats Row */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            padding: 60px 20px;
            border-top: 1px solid var(--border-dim);
            border-bottom: 1px solid var(--border-dim);
            margin: 20px 0;
        }
        .stat-card {
            text-align: left;
            padding: 30px 24px;
            background: rgba(13, 17, 30, 0.5);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-dim);
            transition: all 0.3s;
        }
        .stat-card:hover {
            border-color: var(--accent-blue);
            box-shadow: var(--shadow-glow);
        }
        .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--accent-cyan);
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-top: 8px;
        }

        /* FAQ Section */
        .faq-section {
            padding: 80px 20px;
        }
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 28px 30px;
            transition: all 0.3s;
        }
        .faq-item:hover {
            border-color: var(--accent-blue);
            box-shadow: var(--shadow-glow);
        }
        .faq-item h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .faq-item h3 i {
            color: var(--accent-cyan);
            font-size: 1.2rem;
        }
        .faq-item p {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* CTA Section */
        .cta-full {
            background: linear-gradient(135deg, rgba(0,82,255,0.12) 0%, rgba(0,240,255,0.06) 100%);
            border: 1px solid var(--accent-blue);
            border-radius: var(--radius-lg);
            padding: 70px 50px;
            margin: 80px 20px;
            text-align: left;
        }
        .cta-full h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-full p {
            font-size: 1.1rem;
            color: var(--text-silver);
            max-width: 700px;
            line-height: 1.7;
            margin-bottom: 32px;
        }
        .btn-primary-lg {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent-blue);
            color: #fff;
            padding: 16px 38px;
            border-radius: 30px;
            font-size: 1.05rem;
            font-weight: 700;
            border: none;
            box-shadow: 0 0 24px rgba(0, 82, 255, 0.5);
            transition: all 0.3s;
        }
        .btn-primary-lg:hover {
            background: #1a67ff;
            box-shadow: 0 0 36px rgba(0, 240, 255, 0.6);
            transform: translateY(-2px);
        }

        /* Footer */
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-dim);
            padding: 60px 20px 30px;
            margin-top: 40px;
        }
        .footer-grid {
            max-width: 1320px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
        }
        .footer-col h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 18px;
        }
        .footer-col p, .footer-col a {
            display: block;
            font-size: 0.92rem;
            color: var(--text-muted);
            margin-bottom: 10px;
            transition: color 0.25s;
        }
        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        /* FAB */
        .fab-floating {
            position: fixed;
            left: 24px;
            bottom: 96px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.75);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(8,9,15,0.8), rgba(8,9,15,0.8)), linear-gradient(135deg, #00F0FF, #0052FF);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.4rem;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.45);
            transition: all 0.3s;
            cursor: pointer;
        }
        .fab-floating:hover {
            transform: scale(1.1);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.7);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .criteria-item {
                grid-template-columns: 1fr;
            }
            .criteria-img img {
                height: 260px;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-links, .nav-cta-group {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .mobile-menu.active {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 68px;
                left: 0;
                width: 100%;
                background: rgba(8,9,15,0.98);
                backdrop-filter: blur(20px);
                padding: 24px;
                gap: 16px;
                border-bottom: 1px solid var(--border-dim);
            }
            .mobile-menu a {
                font-size: 1rem;
                color: var(--text-silver);
                padding: 10px 0;
                border-bottom: 1px solid var(--border-dim);
            }
            .page-header h1 {
                font-size: 2rem;
            }
            .criteria-item {
                padding: 30px 20px;
            }
            .criteria-number {
                font-size: 3.5rem;
                right: 16px;
                top: 10px;
            }
            .stats-row {
                grid-template-columns: 1fr;
            }
            .cta-full {
                padding: 40px 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .criteria-content h2 {
                font-size: 1.4rem;
            }
        }

/* roulang page: category4 */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8E9BAB;
            --border-dim: #1E293B;
            --border-glow: #0052FF;
            --shadow-glow: 0 0 20px rgba(0, 82, 255, 0.3);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
        }
        * {
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--bg-deep);
            color: var(--text-silver);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            margin: 0;
            padding: 0;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        .nav-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-dim);
            z-index: 1000;
            padding: 0 20px;
        }
        .nav-inner {
            max-width: 1320px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .logo-text {
            font-size: 1.25rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.3px;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 34px;
        }
        .nav-links a {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-silver);
            transition: color 0.25s;
            position: relative;
            padding: 6px 0;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-cyan);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
        }
        .nav-cta-group {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .btn-login {
            background: transparent;
            border: 1px solid var(--text-silver);
            color: var(--text-silver);
            padding: 8px 22px;
            border-radius: 24px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s;
        }
        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }
        .btn-signup {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            padding: 9px 26px;
            border-radius: 24px;
            font-size: 0.9rem;
            font-weight: 600;
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.45);
            transition: all 0.3s;
        }
        .btn-signup:hover {
            background: #1a67ff;
            box-shadow: 0 0 22px rgba(0, 240, 255, 0.55);
            transform: translateY(-1px);
        }
        .mobile-toggle {
            display: none;
            font-size: 1.6rem;
            color: var(--text-silver);
            background: none;
            border: none;
        }
        .mobile-menu {
            display: none;
        }
        .section-pad {
            padding: 80px 20px;
            max-width: 1320px;
            margin: 0 auto;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .section-sub {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.7;
            margin-bottom: 48px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 38px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .card-entry {
            background: var(--bg-card);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
        }
        .card-entry:hover {
            border-color: var(--accent-blue);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }
        .card-entry .icon-wrap {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(0, 82, 255, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent-cyan);
            margin-bottom: 20px;
        }
        .btn-primary {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            padding: 14px 38px;
            border-radius: 28px;
            font-size: 1.05rem;
            font-weight: 600;
            box-shadow: 0 0 18px rgba(0, 82, 255, 0.4);
            transition: all 0.3s;
            display: inline-block;
            text-align: center;
        }
        .btn-primary:hover {
            background: #1a67ff;
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.55);
            transform: translateY(-2px);
        }
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 999;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.75);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent-cyan);
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            animation: fabBreath 2.4s ease-in-out infinite;
        }
        .fab-left:hover {
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.8);
            transform: scale(1.1);
            color: #fff;
        }
        @keyframes fabBreath {
            0%,
            100% {
                box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            }
            50% {
                box-shadow: 0 0 26px rgba(0, 240, 255, 0.8);
            }
        }
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-dim);
            padding: 60px 20px 40px;
        }
        .footer-grid {
            max-width: 1320px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 36px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 18px;
        }
        .footer-col a,
        .footer-col p {
            font-size: 0.92rem;
            color: var(--text-muted);
            display: block;
            margin-bottom: 10px;
            transition: color 0.2s;
        }
        .footer-col a:hover {
            color: var(--accent-cyan);
        }
        .promo-badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 14px;
            font-size: 0.78rem;
            font-weight: 600;
            background: rgba(255, 215, 0, 0.15);
            color: #FFD700;
            border: 1px solid rgba(255, 215, 0, 0.3);
        }
        .promo-badge.hot {
            background: rgba(255, 0, 0, 0.2);
            color: #FF4444;
            border-color: rgba(255, 0, 0, 0.4);
        }
        .step-item {
            display: flex;
            gap: 18px;
            margin-bottom: 28px;
            padding: 18px;
            background: rgba(13, 17, 30, 0.6);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-dim);
            transition: all 0.3s;
        }
        .step-item:hover {
            border-color: var(--accent-blue);
        }
        .step-number {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--accent-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
            color: #fff;
            flex-shrink: 0;
        }
        @media (max-width: 1024px) {
            .grid-3,
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .mobile-menu.active {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 68px;
                left: 0;
                width: 100%;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(18px);
                border-bottom: 1px solid var(--border-dim);
                padding: 20px;
                gap: 16px;
                z-index: 999;
            }
            .mobile-menu.active a {
                font-size: 1rem;
                font-weight: 500;
                color: var(--text-silver);
                padding: 8px 0;
            }
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .fab-left {
                bottom: 80px;
                left: 10px;
                width: 48px;
                height: 48px;
                font-size: 1.3rem;
            }
        }
        @media (max-width: 520px) {
            .nav-cta-group .btn-login {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
            .nav-cta-group .btn-signup {
                padding: 7px 18px;
                font-size: 0.8rem;
            }
            .logo-text {
                font-size: 1.1rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-deep: #08090F;
            --bg-card: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8E9BAB;
            --border-dim: #1E293B;
            --border-glow: #0052FF;
            --shadow-glow: 0 0 20px rgba(0, 82, 255, 0.3);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--bg-deep);
            color: var(--text-silver);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        .container {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .nav-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-dim);
            z-index: 1000;
            padding: 0 20px;
        }
        .nav-inner {
            max-width: 1320px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .logo-text {
            font-size: 1.25rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.3px;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 34px;
        }
        .nav-links a {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-silver);
            transition: color 0.25s;
            position: relative;
            padding: 6px 0;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent-cyan);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
        }
        .nav-cta-group {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .btn-login {
            background: transparent;
            border: 1px solid var(--text-silver);
            color: var(--text-silver);
            padding: 8px 22px;
            border-radius: 24px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s;
        }
        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }
        .btn-signup {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            padding: 9px 26px;
            border-radius: 24px;
            font-size: 0.9rem;
            font-weight: 600;
            box-shadow: 0 0 14px rgba(0, 82, 255, 0.45);
            transition: all 0.3s;
        }
        .btn-signup:hover {
            background: #1a67ff;
            box-shadow: 0 0 22px rgba(0, 240, 255, 0.55);
            transform: translateY(-1px);
        }
        .mobile-toggle {
            display: none;
            font-size: 1.6rem;
            color: var(--text-silver);
            background: none;
            border: none;
        }
        .mobile-menu {
            display: none;
        }
        .section-pad {
            padding: 80px 20px;
            max-width: 1320px;
            margin: 0 auto;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .section-sub {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.7;
            margin-bottom: 48px;
        }
        .btn-primary {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            padding: 12px 32px;
            border-radius: 28px;
            font-size: 1rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 0 18px rgba(0, 82, 255, 0.4);
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background: #1a67ff;
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.5);
            transform: translateY(-2px);
        }
        .coupon-hero-card {
            background: linear-gradient(135deg, #1a1e30, #0d111e);
            border: 2px solid var(--accent-cyan);
            border-radius: var(--radius-lg);
            padding: 48px 36px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            box-shadow: 0 0 40px rgba(0, 240, 255, 0.25);
            position: relative;
            overflow: hidden;
        }
        .coupon-hero-card::before {
            content: '';
            position: absolute;
            top: -50px;
            right: -50px;
            width: 150px;
            height: 150px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.15), transparent);
            border-radius: 50%;
        }
        .deal-card {
            background: var(--bg-card);
            border: 1px solid var(--border-dim);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: all 0.3s;
            position: relative;
        }
        .deal-card:hover {
            border-color: var(--accent-blue);
            box-shadow: var(--shadow-glow);
            transform: translateY(-3px);
        }
        .badge-hot {
            background: #ff2d55;
            color: #fff;
            padding: 4px 12px;
            border-radius: 14px;
            font-size: 0.75rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .badge-new {
            background: var(--accent-cyan);
            color: #000;
            padding: 4px 12px;
            border-radius: 14px;
            font-size: 0.75rem;
            font-weight: 700;
        }
        .metric-card {
            background: rgba(0, 82, 255, 0.08);
            border-left: 3px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            text-align: left;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-dim);
            padding: 24px 0;
            cursor: pointer;
            transition: background 0.25s;
        }
        .faq-item:hover {
            background: rgba(0, 82, 255, 0.04);
        }
        .faq-question {
            font-weight: 600;
            color: var(--text-white);
            font-size: 1.05rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-answer {
            color: var(--text-muted);
            margin-top: 12px;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .site-footer {
            background: #05060d;
            border-top: 1px solid var(--border-dim);
            padding: 60px 20px 30px;
            margin-top: 80px;
        }
        .footer-grid {
            max-width: 1320px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 36px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            color: var(--text-white);
            font-weight: 600;
            margin-bottom: 18px;
            font-size: 1rem;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            margin-bottom: 10px;
            font-size: 0.9rem;
            transition: color 0.25s;
        }
        .footer-col a:hover {
            color: var(--accent-cyan);
        }
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(10px);
            border: 2px solid var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--accent-cyan);
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.45);
            transition: all 0.3s;
            cursor: pointer;
        }
        .fab-left:hover {
            transform: scale(1.1);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.7);
            background: rgba(0, 240, 255, 0.15);
        }
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .coupon-hero-card {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 768px) {
            .nav-links,
            .nav-cta-group {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .mobile-menu.show {
                display: flex;
                flex-direction: column;
                gap: 12px;
                padding: 16px 20px;
                background: rgba(8, 9, 15, 0.98);
                border-bottom: 1px solid var(--border-dim);
                position: absolute;
                top: 68px;
                left: 0;
                width: 100%;
            }
            .mobile-menu a {
                color: var(--text-silver);
                font-weight: 500;
                padding: 6px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .coupon-hero-card {
                padding: 28px 20px;
            }
        }
        @media (max-width: 520px) {
            .section-pad {
                padding: 50px 16px;
            }
        }