/* roulang page: index */
:root {
            --bg-primary: #0a0e1a;
            --bg-secondary: #0d1225;
            --bg-card: rgba(22, 30, 58, 0.72);
            --bg-card-hover: rgba(30, 40, 75, 0.88);
            --accent-blue: #1a6dff;
            --accent-cyan: #00c2ff;
            --accent-glow: rgba(0, 194, 255, 0.45);
            --accent-glow-soft: rgba(26, 109, 255, 0.25);
            --text-primary: #ffffff;
            --text-secondary: #b8c4dc;
            --text-muted: #7a8aad;
            --border-glass: rgba(255, 255, 255, 0.1);
            --border-glow: rgba(0, 194, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 30px rgba(0, 194, 255, 0.2);
            --font-body: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition: all .3s cubic-bezier(.25, .46, .45, .94);
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

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

        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background:
                radial-gradient(ellipse at 20% 20%, rgba(26, 109, 255, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 80% 60%, rgba(0, 194, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 90%, rgba(26, 109, 255, 0.05) 0%, transparent 45%);
            pointer-events: none;
            z-index: 0;
        }

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

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

        a:hover,
        a:focus {
            color: #66d9ff;
            text-decoration: none;
        }

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

        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 1rem;
        }

        p {
            color: var(--text-secondary);
        }

        .container {
            max-width: 1200px;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
            position: relative;
            z-index: 1;
        }

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

        /* Header / Nav */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(10, 14, 26, 0.82);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-glass);
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(10, 14, 26, 0.95);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
        }

        .navbar-brand {
            font-weight: 800;
            font-size: 1.15rem;
            color: var(--text-primary);
            letter-spacing: .3px;
            max-width: 260px;
            white-space: normal;
            line-height: 1.25;
        }
        .navbar-brand:hover,
        .navbar-brand:focus {
            color: var(--text-primary);
        }
        .navbar-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            margin-right: 8px;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .navbar-nav .nav-link {
            color: var(--text-secondary);
            font-weight: 500;
            font-size: .95rem;
            padding: 0.6rem 1rem;
            border-radius: 6px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link:focus {
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.06);
        }
        .navbar-nav .nav-link.active {
            color: var(--accent-cyan);
            font-weight: 600;
        }

        .navbar-toggler {
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            padding: .45rem .6rem;
            background: transparent;
        }
        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--accent-cyan);
        }
        .navbar-toggler-icon {
            filter: invert(1);
        }

        .btn-nav {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: .85rem;
            border-radius: 50px;
            padding: .55rem 1.2rem;
            border: 1px solid rgba(255, 255, 255, .18);
            background: transparent;
            color: var(--text-primary);
            transition: var(--transition);
        }
        .btn-nav:hover,
        .btn-nav:focus {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.08);
        }
        .btn-nav.btn-solid {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border-color: transparent;
            color: #fff;
            box-shadow: 0 0 20px var(--accent-glow-soft);
        }
        .btn-nav.btn-solid:hover,
        .btn-nav.btn-solid:focus {
            box-shadow: 0 0 32px var(--accent-glow);
            color: #fff;
            background: linear-gradient(135deg, #2580ff, #33d3ff);
        }

        /* Hero */
        .hero-section {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding: 8rem 0 5rem;
            overflow: hidden;
        }
        .hero-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            opacity: .28;
            z-index: 0;
        }
        .hero-section::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10, 14, 26, 0.65) 0%, rgba(10, 14, 26, 0.82) 50%, var(--bg-primary) 100%);
            z-index: 0;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 194, 255, 0.12);
            border: 1px solid rgba(0, 194, 255, 0.3);
            border-radius: 50px;
            padding: .4rem 1rem;
            font-size: .82rem;
            font-weight: 600;
            color: var(--accent-cyan);
            letter-spacing: .3px;
            margin-bottom: 1.5rem;
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #00e68a;
            box-shadow: 0 0 10px #00e68a;
            animation: pulse-dot 1.8s infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: .5; transform: scale(1.5); }
        }

        .hero-title {
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 1.2rem;
            letter-spacing: -.4px;
        }
        .hero-title .highlight {
            background: linear-gradient(135deg, #66d9ff, #00c2ff, #1a6dff);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 620px;
            margin-bottom: 1.8rem;
            line-height: 1.7;
        }

        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: .9rem;
            align-items: center;
            margin-bottom: 2.2rem;
        }

        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border: none;
            border-radius: 50px;
            padding: .9rem 2rem;
            font-weight: 700;
            font-size: 1rem;
            color: #fff;
            box-shadow: 0 6px 28px var(--accent-glow-soft);
            transition: var(--transition);
        }
        .btn-hero-primary:hover,
        .btn-hero-primary:focus {
            box-shadow: 0 10px 42px var(--accent-glow);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-hero-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border-glass);
            border-radius: 50px;
            padding: .9rem 1.8rem;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            transition: var(--transition);
        }
        .btn-hero-secondary:hover,
        .btn-hero-secondary:focus {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.07);
            transform: translateY(-2px);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 1.8rem;
            align-items: center;
        }
        .hero-stats .stat {
            display: flex;
            align-items: center;
            gap: .6rem;
        }
        .hero-stats .stat i {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 194, 255, 0.1);
            border-radius: 50%;
            color: var(--accent-cyan);
            font-size: 1rem;
        }
        .hero-stats .stat span {
            font-weight: 700;
            color: var(--text-primary);
        }
        .hero-stats .stat small {
            display: block;
            color: var(--text-muted);
            font-size: .8rem;
        }

        /* Hero form */
        .hero-form-card {
            background: var(--bg-card);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            box-shadow: var(--shadow-card);
        }
        .hero-form-card h3 {
            font-size: 1.25rem;
            margin-bottom: .4rem;
        }
        .hero-form-card .form-label {
            color: var(--text-secondary);
            font-size: .85rem;
            font-weight: 600;
            margin-bottom: .3rem;
        }
        .hero-form-card .form-control {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            padding: .7rem 1rem;
            font-size: .95rem;
            transition: var(--transition);
        }
        .hero-form-card .form-control::placeholder {
            color: var(--text-muted);
        }
        .hero-form-card .form-control:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 14px rgba(0, 194, 255, 0.18);
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-primary);
        }
        .hero-form-card .btn-submit {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border: none;
            border-radius: 50px;
            padding: .7rem 1.8rem;
            font-weight: 700;
            color: #fff;
            font-size: .95rem;
            box-shadow: 0 4px 18px var(--accent-glow-soft);
            transition: var(--transition);
            width: 100%;
        }
        .hero-form-card .btn-submit:hover,
        .hero-form-card .btn-submit:focus {
            box-shadow: 0 8px 28px var(--accent-glow);
            transform: translateY(-1px);
        }
        .hero-form-card .form-note {
            font-size: .78rem;
            color: var(--text-muted);
            margin-top: .5rem;
            text-align: center;
        }

        /* Sections */
        .section {
            padding: 4.5rem 0;
            position: relative;
        }
        .section-dark {
            background: var(--bg-secondary);
        }
        .section-header {
            margin-bottom: 2.5rem;
        }
        .section-header .section-tag {
            display: inline-block;
            font-size: .75rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--accent-cyan);
            margin-bottom: .6rem;
        }
        .section-header h2 {
            font-size: clamp(1.7rem, 3vw, 2.4rem);
            font-weight: 800;
            letter-spacing: -.3px;
        }
        .section-header p {
            font-size: 1.02rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin-bottom: 0;
        }

        /* Benefit cards */
        .benefit-card {
            background: var(--bg-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 1.8rem 1.6rem;
            height: 100%;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .benefit-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            opacity: 0;
            transition: var(--transition);
        }
        .benefit-card:hover::before {
            opacity: 1;
        }
        .benefit-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-5px);
            box-shadow: 0 16px 42px rgba(0, 0, 0, 0.5), var(--shadow-glow);
            border-color: var(--border-glow);
        }
        .benefit-card .benefit-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 54px;
            height: 54px;
            border-radius: 16px;
            background: rgba(0, 194, 255, 0.12);
            color: var(--accent-cyan);
            font-size: 1.5rem;
            margin-bottom: 1.2rem;
            border: 1px solid rgba(0, 194, 255, 0.22);
        }
        .benefit-card h3 {
            font-size: 1.22rem;
            font-weight: 700;
            margin-bottom: .6rem;
        }
        .benefit-card p {
            font-size: .93rem;
            color: var(--text-secondary);
            margin-bottom: 0;
            line-height: 1.65;
        }

        /* Scene / Demo */
        .scene-block {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .scene-block:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow), 0 18px 48px rgba(0, 0, 0, 0.5);
        }
        .scene-block img {
            width: 100%;
            height: 230px;
            object-fit: cover;
        }
        .scene-body {
            padding: 1.5rem 1.6rem;
        }
        .scene-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: .6rem;
        }
        .scene-body p {
            font-size: .9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .scene-badge {
            display: inline-block;
            background: rgba(0, 194, 255, 0.1);
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 194, 255, 0.25);
            font-size: .72rem;
            font-weight: 600;
            border-radius: 50px;
            padding: .25rem .7rem;
            margin-bottom: .8rem;
        }

        /* Social proof */
        .proof-item {
            text-align: left;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 1.4rem 1.5rem;
            height: 100%;
            transition: var(--transition);
        }
        .proof-item:hover {
            background: rgba(255, 255, 255, 0.07);
            border-color: var(--border-glow);
        }
        .proof-item .proof-rating {
            color: #ffd700;
            font-size: .85rem;
            letter-spacing: 1px;
            margin-bottom: .6rem;
        }
        .proof-item p {
            font-size: .9rem;
            color: var(--text-secondary);
            margin-bottom: .7rem;
            font-style: italic;
        }
        .proof-item .proof-name {
            font-weight: 700;
            color: var(--text-primary);
            font-size: .88rem;
        }
        .proof-item .proof-role {
            color: var(--text-muted);
            font-size: .78rem;
        }

        /* CMS list */
        .cms-list {
            background: var(--bg-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 1.8rem;
            box-shadow: var(--shadow-card);
        }
        .cms-list-item {
            display: block;
            padding: .8rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            transition: var(--transition);
        }
        .cms-list-item:last-child {
            border-bottom: none;
        }
        .cms-list-item:hover .cms-list-title {
            color: var(--accent-cyan);
        }
        .cms-list-title {
            font-weight: 600;
            font-size: .95rem;
            color: var(--text-primary);
            margin-bottom: .2rem;
            transition: var(--transition);
        }
        .cms-list-meta {
            font-size: .78rem;
            color: var(--text-muted);
        }
        .cms-list-meta i {
            margin-right: 4px;
            color: var(--accent-cyan);
        }
        .cms-empty {
            color: var(--text-muted);
            font-size: .95rem;
            padding: 1rem 0;
        }

        /* FAQ */
        .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md) !important;
            margin-bottom: .9rem;
            overflow: hidden;
            transition: var(--transition);
        }
        .accordion-item:hover {
            border-color: var(--border-glow);
        }
        .accordion-button {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            font-size: .98rem;
            padding: 1.2rem 1.5rem;
            border-radius: var(--radius-md) !important;
            transition: var(--transition);
        }
        .accordion-button:not(.collapsed) {
            background: rgba(0, 194, 255, 0.08);
            color: var(--accent-cyan);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: none;
            outline: none;
        }
        .accordion-button::after {
            filter: invert(0.7);
        }
        .accordion-body {
            background: rgba(255, 255, 255, 0.03);
            color: var(--text-secondary);
            font-size: .9rem;
            padding: 1rem 1.5rem 1.2rem;
            line-height: 1.7;
        }

        /* Fixed bottom CTA bar */
        .fixed-cta-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1040;
            background: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--border-glass);
            padding: .75rem 1rem;
            transform: translateY(100%);
            transition: transform .4s cubic-bezier(.25, .46, .45, .94);
        }
        .fixed-cta-bar.show {
            transform: translateY(0);
        }
        .fixed-cta-bar .cta-text {
            font-weight: 600;
            font-size: .9rem;
            color: var(--text-primary);
        }
        .fixed-cta-bar .cta-sub {
            font-size: .75rem;
            color: var(--text-muted);
        }
        .fixed-cta-bar .btn-cta {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border: none;
            border-radius: 50px;
            padding: .6rem 1.5rem;
            font-weight: 700;
            font-size: .85rem;
            color: #fff;
            box-shadow: 0 4px 18px var(--accent-glow-soft);
            transition: var(--transition);
            white-space: nowrap;
        }
        .fixed-cta-bar .btn-cta:hover,
        .fixed-cta-bar .btn-cta:focus {
            box-shadow: 0 8px 28px var(--accent-glow);
            color: #fff;
            transform: translateY(-1px);
        }
        .fixed-cta-close {
            background: transparent;
            border: none;
            color: var(--text-muted);
            font-size: 1.1rem;
            padding: .2rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .fixed-cta-close:hover {
            color: var(--text-primary);
        }

        /* FAB */
        .fab-support {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 1045;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(10, 14, 26, 0.75);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(0, 194, 255, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.4rem;
            cursor: pointer;
            box-shadow: 0 0 22px rgba(0, 194, 255, 0.28);
            transition: var(--transition);
            opacity: .72;
            animation: fab-breathe 3s ease-in-out infinite;
        }
        .fab-support:hover {
            opacity: 1;
            box-shadow: 0 0 36px rgba(0, 194, 255, 0.5);
            transform: scale(1.1);
            color: #66d9ff;
        }
        .fab-support:active {
            transform: scale(0.95);
        }
        .fab-support .fab-dot {
            position: absolute;
            top: 8px;
            right: 8px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #ff2d55;
            box-shadow: 0 0 8px #ff2d55;
            animation: pulse-dot 1.6s infinite;
        }

        @keyframes fab-breathe {
            0%, 100% { opacity: .72; }
            50% { opacity: .95; }
        }

        /* Footer */
        .site-footer {
            background: #080c15;
            border-top: 1px solid var(--border-glass);
            padding: 2.5rem 0 1.5rem;
            position: relative;
            z-index: 1;
        }
        .site-footer .footer-brand {
            font-weight: 800;
            font-size: 1.1rem;
            color: var(--text-primary);
            margin-bottom: .5rem;
            line-height: 1.35;
        }
        .site-footer p {
            color: var(--text-muted);
            font-size: .82rem;
        }
        .site-footer .footer-links {
            list-style: none;
            padding-left: 0;
        }
        .site-footer .footer-links li {
            margin-bottom: .4rem;
        }
        .site-footer .footer-links a {
            color: var(--text-muted);
            font-size: .82rem;
            transition: var(--transition);
        }
        .site-footer .footer-links a:hover {
            color: var(--accent-cyan);
        }
        .footer-divider {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            margin: 1.5rem 0 1rem;
        }
        .footer-copyright {
            color: var(--text-muted);
            font-size: .78rem;
            text-align: center;
        }

        /* Counter / countdown */
        .countdown-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 1rem 1.2rem;
            text-align: center;
            min-width: 70px;
        }
        .countdown-item .count-num {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--accent-cyan);
        }
        .countdown-item .count-label {
            font-size: .72rem;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* Version update / changelog */
        .version-card {
            background: var(--bg-card);
            backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            transition: var(--transition);
            height: 100%;
        }
        .version-card:hover {
            border-color: var(--border-glow);
            background: var(--bg-card-hover);
            transform: translateY(-4px);
        }
        .version-card .version-badge {
            display: inline-block;
            background: rgba(0, 194, 255, 0.1);
            color: var(--accent-cyan);
            font-size: .72rem;
            font-weight: 700;
            border-radius: 6px;
            padding: .2rem .55rem;
            margin-bottom: .7rem;
            border: 1px solid rgba(0, 194, 255, 0.25);
        }
        .version-card h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: .5rem;
        }
        .version-card p {
            font-size: .85rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* Topic card */
        .topic-card {
            position: relative;
            background: var(--bg-card);
            backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
        }
        .topic-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-4px);
            box-shadow: 0 14px 36px rgba(0, 0, 0, 0.5);
        }
        .topic-card img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            transition: var(--transition);
        }
        .topic-card:hover img {
            transform: scale(1.05);
        }
        .topic-card .topic-body {
            padding: 1.2rem 1.4rem;
        }
        .topic-card h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: .4rem;
        }
        .topic-card p {
            font-size: .82rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* Security / safety */
        .safety-item {
            display: flex;
            align-items: flex-start;
            gap: .9rem;
            padding: 1rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }
        .safety-item:last-child {
            border-bottom: none;
        }
        .safety-item i {
            font-size: 1.3rem;
            color: var(--accent-cyan);
            flex-shrink: 0;
            margin-top: 2px;
        }
        .safety-item h4 {
            font-size: .98rem;
            font-weight: 600;
            margin-bottom: .2rem;
        }
        .safety-item p {
            font-size: .85rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* Live stream */
        .live-card {
            position: relative;
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .live-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow), 0 18px 48px rgba(0, 0, 0, 0.5);
        }
        .live-card img {
            width: 100%;
            height: 210px;
            object-fit: cover;
        }
        .live-card .live-overlay {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(255, 45, 85, 0.9);
            color: #fff;
            font-size: .72rem;
            font-weight: 700;
            border-radius: 50px;
            padding: .25rem .7rem;
            letter-spacing: .5px;
        }
        .live-card .live-body {
            padding: 1.3rem 1.5rem;
        }
        .live-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
        }
        .live-card .live-countdown {
            font-size: .85rem;
            color: var(--accent-cyan);
            font-weight: 600;
        }
        .live-card ul {
            list-style: none;
            padding: 0;
            margin: .8rem 0 0;
        }
        .live-card ul li {
            font-size: .82rem;
            color: var(--text-secondary);
            padding: .25rem 0;
        }
        .live-card ul li i {
            color: var(--accent-cyan);
            margin-right: 6px;
            font-size: .7rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-section {
                padding-top: 7rem;
                min-height: auto;
            }
            .section {
                padding: 3.5rem 0;
            }
        }

        @media (max-width: 768px) {
            .hero-section {
                padding-top: 6rem;
                padding-bottom: 3rem;
            }
            .hero-title {
                font-size: clamp(1.9rem, 7vw, 2.6rem);
            }
            .hero-desc {
                font-size: 1rem;
            }
            .hero-form-card {
                padding: 1.5rem;
            }
            .hero-stats {
                gap: 1.2rem;
            }
            .section {
                padding: 2.8rem 0;
            }
            .navbar-brand {
                max-width: 200px;
                font-size: .95rem;
            }
            .navbar-nav .nav-link {
                padding: .5rem .8rem;
                text-align: left;
            }
            .navbar-collapse {
                background: rgba(10, 14, 26, 0.98);
                border-radius: var(--radius-md);
                padding: 1rem;
                margin-top: .5rem;
                border: 1px solid var(--border-glass);
            }
            .fixed-cta-bar {
                padding: .6rem .8rem;
            }
            .fixed-cta-bar .cta-text {
                font-size: .78rem;
            }
            .fixed-cta-bar .cta-sub {
                font-size: .68rem;
            }
            .fixed-cta-bar .btn-cta {
                padding: .5rem 1rem;
                font-size: .75rem;
            }
            .fab-support {
                left: .7rem;
                bottom: 5.5rem;
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
            }
            .scene-block img {
                height: 180px;
            }
            .topic-card img {
                height: 140px;
            }
            .live-card img {
                height: 180px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .hero-title {
                font-size: 1.75rem;
            }
            .hero-desc {
                font-size: .9rem;
            }
            .hero-cta-group {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-hero-primary,
            .btn-hero-secondary {
                width: 100%;
                justify-content: center;
            }
            .hero-stats {
                flex-direction: column;
                align-items: flex-start;
                gap: .8rem;
            }
            .section {
                padding: 2.2rem 0;
            }
            .benefit-card {
                padding: 1.4rem 1.3rem;
            }
            .countdown-item {
                min-width: 56px;
                padding: .7rem .6rem;
            }
            .countdown-item .count-num {
                font-size: 1.25rem;
            }
            .countdown-item .count-label {
                font-size: .62rem;
            }
            .live-card img {
                height: 150px;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #0a0e1a;
            --bg-secondary: #0d1225;
            --bg-card: rgba(22, 30, 58, 0.72);
            --bg-card-hover: rgba(30, 40, 75, 0.88);
            --accent-blue: #1a6dff;
            --accent-cyan: #00c2ff;
            --accent-glow: rgba(0, 194, 255, 0.45);
            --accent-glow-soft: rgba(26, 109, 255, 0.25);
            --text-primary: #ffffff;
            --text-secondary: #b8c4dc;
            --text-muted: #7a8aad;
            --border-glass: rgba(255, 255, 255, 0.1);
            --border-glow: rgba(0, 194, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 30px rgba(0, 194, 255, 0.2);
            --font-body: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition: all .3s cubic-bezier(.25, .46, .45, .94);
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-body);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
        }
        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background:
                radial-gradient(ellipse at 20% 20%, rgba(26, 109, 255, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 80% 60%, rgba(0, 194, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 90%, rgba(26, 109, 255, 0.05) 0%, transparent 45%);
            pointer-events: none;
            z-index: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover,
        a:focus {
            color: #66d9ff;
            text-decoration: none;
        }
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        .container {
            max-width: 1200px;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
            position: relative;
            z-index: 1;
        }
        .container-fluid {
            position: relative;
            z-index: 1;
        }

        /* Header / Nav */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(10, 14, 26, 0.82);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-glass);
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(10, 14, 26, 0.95);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.15rem;
            color: var(--text-primary);
            letter-spacing: .3px;
            max-width: 260px;
            white-space: normal;
            line-height: 1.25;
        }
        .navbar-brand:hover,
        .navbar-brand:focus {
            color: var(--text-primary);
        }
        .navbar-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            margin-right: 8px;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .navbar-nav .nav-link {
            color: var(--text-secondary);
            font-weight: 500;
            font-size: .95rem;
            padding: 0.6rem 1rem;
            border-radius: 6px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link:focus {
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.06);
        }
        .navbar-nav .nav-link.active {
            color: var(--accent-cyan);
            font-weight: 600;
        }
        .navbar-toggler {
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            padding: .45rem .6rem;
            background: transparent;
        }
        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--accent-cyan);
        }
        .navbar-toggler-icon {
            filter: invert(1);
        }
        .btn-nav {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: .85rem;
            border-radius: 50px;
            padding: .55rem 1.2rem;
            border: 1px solid rgba(255, 255, 255, .18);
            background: transparent;
            color: var(--text-primary);
            transition: var(--transition);
        }
        .btn-nav:hover,
        .btn-nav:focus {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.08);
        }
        .btn-nav.btn-solid {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border-color: transparent;
            color: #fff;
            box-shadow: 0 0 20px var(--accent-glow-soft);
        }
        .btn-nav.btn-solid:hover,
        .btn-nav.btn-solid:focus {
            box-shadow: 0 0 32px var(--accent-glow);
            color: #fff;
            background: linear-gradient(135deg, #2580ff, #33d3ff);
        }

        /* Hero - Category Landing */
        .hero-category {
            position: relative;
            padding: 10rem 0 5.5rem;
            background:
                radial-gradient(ellipse at 70% 30%, rgba(26, 109, 255, 0.2) 0%, transparent 60%),
                radial-gradient(ellipse at 20% 70%, rgba(0, 194, 255, 0.12) 0%, transparent 50%),
                rgba(10, 14, 26, 0.55);
            overflow: hidden;
        }
        .hero-category::after {
            content: "";
            position: absolute;
            inset: 0;
            background:
                linear-gradient(180deg, rgba(10, 14, 26, 0.65) 0%, rgba(10, 14, 26, 0.9) 100%);
            z-index: 0;
            pointer-events: none;
        }
        .hero-category .container {
            position: relative;
            z-index: 2;
        }
        .hero-cat-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 194, 255, 0.12);
            border: 1px solid rgba(0, 194, 255, 0.35);
            color: var(--accent-cyan);
            font-weight: 700;
            font-size: .8rem;
            letter-spacing: .6px;
            text-transform: uppercase;
            padding: .45rem 1rem;
            border-radius: 50px;
            box-shadow: 0 0 18px rgba(0, 194, 255, 0.12);
            margin-bottom: 1.3rem;
        }
        .hero-cat-badge i {
            font-size: .9rem;
        }
        .hero-cat-title {
            font-size: clamp(2.2rem, 5.5vw, 4.2rem);
            font-weight: 900;
            line-height: 1.12;
            letter-spacing: -1px;
            margin-bottom: 1.3rem;
            color: var(--text-primary);
            text-shadow: 0 0 40px rgba(0, 194, 255, 0.25);
        }
        .hero-cat-title span {
            color: var(--accent-cyan);
        }
        .hero-cat-subtitle {
            font-size: clamp(1.05rem, 2vw, 1.3rem);
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.7;
            margin-bottom: 2rem;
        }
        .hero-cat-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            align-items: center;
        }
        .btn-primary-glow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            padding: .95rem 2rem;
            border-radius: 50px;
            border: none;
            box-shadow: 0 0 28px var(--accent-glow-soft);
            transition: var(--transition);
        }
        .btn-primary-glow:hover,
        .btn-primary-glow:focus {
            background: linear-gradient(135deg, #2580ff, #33d3ff);
            box-shadow: 0 0 42px var(--accent-glow);
            color: #fff;
            transform: translateY(-3px);
        }
        .btn-outline-glow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            font-size: .95rem;
            padding: .9rem 1.8rem;
            border-radius: 50px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: var(--transition);
        }
        .btn-outline-glow:hover,
        .btn-outline-glow:focus {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.06);
            box-shadow: 0 0 22px rgba(0, 194, 255, 0.1);
        }
        .hero-cat-panel {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 1.8rem;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: var(--shadow-card);
            text-align: left;
        }
        .hero-cat-panel .panel-label {
            font-size: .75rem;
            letter-spacing: 1px;
            text-transform: uppercase;
            color: var(--text-muted);
            font-weight: 600;
            margin-bottom: .5rem;
        }
        .hero-cat-panel h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: .7rem;
        }
        .hero-cat-panel p {
            color: var(--text-secondary);
            font-size: .95rem;
            margin-bottom: 0;
        }
        .hero-cat-panel .stat-row {
            display: flex;
            gap: 1.5rem;
            flex-wrap: wrap;
            margin-top: 1.2rem;
        }
        .stat-badge {
            text-align: left;
        }
        .stat-badge .stat-num {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--accent-cyan);
        }
        .stat-badge .stat-label {
            font-size: .8rem;
            color: var(--text-muted);
        }
        .hero-cat-img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-glass);
            box-shadow: var(--shadow-card);
        }
        .hero-cat-img img {
            width: 100%;
            height: 100%;
            min-height: 300px;
            object-fit: cover;
        }

        /* Section Common */
        .section-space {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: .78rem;
            font-weight: 700;
            letter-spacing: 1.2px;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: .8rem;
        }
        .section-title {
            font-size: clamp(1.8rem, 3.5vw, 2.8rem);
            font-weight: 850;
            letter-spacing: -.5px;
            line-height: 1.18;
            margin-bottom: 1.1rem;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 700px;
            line-height: 1.7;
        }
        .section-divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
            margin: 1.5rem 0 2.5rem;
            border: none;
            opacity: .5;
        }

        /* Feature Cards (asymmetric left-aligned) */
        .feature-panel {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2rem;
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            height: 100%;
            text-align: left;
        }
        .feature-panel:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow), var(--shadow-card);
            transform: translateY(-6px);
        }
        .feature-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, rgba(26, 109, 255, 0.2), rgba(0, 194, 255, 0.18));
            color: var(--accent-cyan);
            font-size: 1.3rem;
            margin-bottom: 1.1rem;
            border: 1px solid rgba(0, 194, 255, 0.2);
        }
        .feature-panel h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: .7rem;
        }
        .feature-panel p {
            color: var(--text-secondary);
            font-size: .95rem;
            margin-bottom: 0;
        }
        .feature-tag {
            display: inline-block;
            background: rgba(255, 255, 255, 0.06);
            color: var(--accent-cyan);
            font-size: .75rem;
            font-weight: 600;
            padding: .3rem .75rem;
            border-radius: 50px;
            border: 1px solid rgba(0, 194, 255, 0.2);
            margin-bottom: .8rem;
        }

        /* Steps / Process */
        .step-list {
            list-style: none;
            padding: 0;
            margin: 0;
            counter-reset: step-counter;
        }
        .step-list li {
            counter-increment: step-counter;
            display: flex;
            gap: 1.2rem;
            align-items: flex-start;
            padding: 1.3rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.07);
            text-align: left;
        }
        .step-list li:last-child {
            border-bottom: none;
        }
        .step-list .step-number {
            font-weight: 900;
            font-size: 1rem;
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.1);
            border: 1px solid rgba(0, 194, 255, 0.25);
            border-radius: 50%;
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .step-list .step-content h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: .3rem;
        }
        .step-list .step-content p {
            color: var(--text-secondary);
            font-size: .92rem;
            margin-bottom: 0;
        }

        /* Media / Scenario Block */
        .scenario-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            overflow: hidden;
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            height: 100%;
            text-align: left;
        }
        .scenario-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow), var(--shadow-card);
            transform: translateY(-5px);
        }
        .scenario-card .scenario-img {
            height: 200px;
            overflow: hidden;
        }
        .scenario-card .scenario-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .5s ease;
        }
        .scenario-card:hover .scenario-img img {
            transform: scale(1.07);
        }
        .scenario-card .scenario-body {
            padding: 1.5rem;
        }
        .scenario-card .scenario-body h4 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: .6rem;
        }
        .scenario-card .scenario-body p {
            color: var(--text-secondary);
            font-size: .92rem;
            margin-bottom: 0;
        }

        /* Social Proof / Stats */
        .proof-bar {
            background: linear-gradient(135deg, rgba(26, 109, 255, 0.08), rgba(0, 194, 255, 0.05));
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2.5rem 2rem;
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
        }
        .proof-bar .proof-item {
            text-align: left;
            padding: .5rem 0;
        }
        .proof-bar .proof-num {
            font-size: 2rem;
            font-weight: 900;
            color: var(--accent-cyan);
            line-height: 1;
        }
        .proof-bar .proof-label {
            color: var(--text-muted);
            font-size: .88rem;
            font-weight: 500;
        }

        /* FAQ */
        .faq-section {
            background: rgba(13, 18, 37, 0.55);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }
        .faq-list .accordion-item {
            background: transparent;
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            margin-bottom: .8rem;
            overflow: hidden;
        }
        .faq-list .accordion-button {
            background: var(--bg-card);
            color: var(--text-primary);
            font-weight: 600;
            font-size: 1rem;
            padding: 1.2rem 1.5rem;
            box-shadow: none;
            border: none;
            text-align: left;
        }
        .faq-list .accordion-button:not(.collapsed) {
            background: var(--bg-card-hover);
            color: var(--accent-cyan);
            box-shadow: none;
        }
        .faq-list .accordion-button:focus {
            box-shadow: none;
            outline: 2px solid var(--accent-cyan);
            outline-offset: -2px;
        }
        .faq-list .accordion-button::after {
            filter: brightness(0) invert(1);
        }
        .faq-list .accordion-body {
            background: rgba(10, 14, 26, 0.4);
            color: var(--text-secondary);
            font-size: .95rem;
            padding: 1.2rem 1.5rem;
            text-align: left;
        }

        /* CTA Strip */
        .cta-strip {
            background: linear-gradient(135deg, rgba(26, 109, 255, 0.18), rgba(0, 194, 255, 0.1));
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            padding: 3rem 2.5rem;
            text-align: center;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: var(--shadow-glow);
        }
        .cta-strip h2 {
            font-size: clamp(1.7rem, 3vw, 2.5rem);
            font-weight: 850;
            margin-bottom: .8rem;
        }
        .cta-strip p {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 1.8rem;
            font-size: 1.05rem;
        }

        /* Footer */
        .site-footer {
            background: rgba(10, 14, 26, 0.9);
            border-top: 1px solid var(--border-glass);
            padding-top: 3.5rem;
            padding-bottom: 2.5rem;
            position: relative;
            z-index: 1;
        }
        .footer-brand {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .site-footer p {
            color: var(--text-muted);
            font-size: .9rem;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: .55rem;
        }
        .footer-links a {
            color: var(--text-secondary);
            font-size: .9rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .footer-links a:hover,
        .footer-links a:focus {
            color: var(--accent-cyan);
        }
        .footer-divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
            margin: 2rem 0 1.5rem;
        }
        .footer-copyright {
            text-align: center;
            font-size: .82rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* Fixed Bottom CTA Bar */
        .bottom-fixed-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1040;
            background: rgba(13, 18, 37, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-top: 1px solid var(--border-glow);
            box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.55);
            padding: .8rem 0;
            display: none;
            transition: transform .4s ease;
        }
        .bottom-fixed-bar.visible {
            display: block;
            transform: translateY(0);
        }
        .bottom-fixed-bar .bar-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1.2rem;
            flex-wrap: wrap;
        }
        .bottom-fixed-bar .bar-text {
            font-weight: 600;
            font-size: .95rem;
            color: var(--text-primary);
        }
        .bottom-fixed-bar .bar-text i {
            color: var(--accent-cyan);
            margin-right: 6px;
        }
        .bottom-fixed-bar .btn-bar {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            font-weight: 700;
            font-size: .9rem;
            padding: .7rem 1.6rem;
            border-radius: 50px;
            border: none;
            box-shadow: 0 0 22px var(--accent-glow-soft);
            transition: var(--transition);
            white-space: nowrap;
        }
        .bottom-fixed-bar .btn-bar:hover,
        .bottom-fixed-bar .btn-bar:focus {
            box-shadow: 0 0 36px var(--accent-glow);
            color: #fff;
            background: linear-gradient(135deg, #2580ff, #33d3ff);
            transform: translateY(-2px);
        }

        /* FAB - Cyber & Neon Style */
        .fab-cyber {
            position: fixed;
            left: 1rem;
            bottom: 6.5rem;
            z-index: 1060;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid;
            border-image: linear-gradient(135deg, #00f0a0, #00c2ff) 1;
            border-radius: 50px;
            padding: .7rem 1.2rem;
            color: #fff;
            font-weight: 700;
            font-size: .85rem;
            cursor: pointer;
            box-shadow: 0 0 18px rgba(0, 240, 160, 0.35), 0 0 28px rgba(0, 194, 255, 0.25);
            transition: var(--transition);
            animation: fabFlow 4s ease-in-out infinite;
            opacity: .75;
            text-decoration: none;
        }
        .fab-cyber i {
            font-size: 1.2rem;
            color: #00f0a0;
        }
        .fab-cyber:hover,
        .fab-cyber:focus {
            opacity: 1;
            box-shadow: 0 0 28px rgba(0, 240, 160, 0.6), 0 0 45px rgba(0, 194, 255, 0.45);
            border-image: linear-gradient(135deg, #00f0a0, #ff00c8) 1;
            color: #fff;
            transform: scale(1.05);
        }
        .fab-cyber:active {
            transform: scale(.95);
        }
        @keyframes fabFlow {
            0%, 100% {
                box-shadow: 0 0 14px rgba(0, 240, 160, 0.25), 0 0 22px rgba(0, 194, 255, 0.2);
            }
            50% {
                box-shadow: 0 0 28px rgba(0, 240, 160, 0.55), 0 0 42px rgba(0, 194, 255, 0.4);
            }
        }

        /* Responsive */
        @media (max-width: 991.98px) {
            .navbar-collapse {
                background: rgba(10, 14, 26, 0.96);
                border-radius: var(--radius-md);
                padding: 1rem;
                margin-top: .5rem;
                border: 1px solid var(--border-glass);
            }
            .navbar-nav .nav-link {
                padding: .7rem 1rem;
            }
            .hero-category {
                padding-top: 8rem;
                padding-bottom: 4rem;
            }
            .section-space {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
        }
        @media (max-width: 767.98px) {
            .hero-cat-title {
                font-size: 2.1rem;
            }
            .hero-cat-subtitle {
                font-size: 1rem;
            }
            .hero-cat-cta-group {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-primary-glow,
            .btn-outline-glow {
                justify-content: center;
            }
            .hero-cat-panel {
                margin-top: 1.5rem;
            }
            .bottom-fixed-bar .bar-content {
                flex-direction: column;
                align-items: stretch;
                text-align: center;
                gap: .7rem;
            }
            .bottom-fixed-bar .btn-bar {
                justify-content: center;
                width: 100%;
            }
            .fab-cyber {
                bottom: 7.5rem;
                left: .75rem;
                padding: .6rem .9rem;
                font-size: .78rem;
            }
            .cta-strip {
                padding: 2.2rem 1.2rem;
                border-radius: var(--radius-lg);
            }
            .proof-bar {
                padding: 1.8rem 1.2rem;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .hero-category {
                padding-top: 7rem;
            }
            .hero-cat-title {
                font-size: 1.8rem;
            }
            .navbar-brand {
                font-size: .95rem;
                max-width: 180px;
            }
            .btn-nav {
                padding: .45rem .8rem;
                font-size: .75rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .feature-panel,
            .scenario-card {
                padding: 1.4rem;
            }
            .step-list li {
                gap: .9rem;
            }
            .step-list .step-number {
                width: 30px;
                height: 30px;
                font-size: .85rem;
            }
        }

/* roulang page: article */
:root {
            --bg-primary: #0a0e1a;
            --bg-secondary: #0d1225;
            --bg-card: rgba(22, 30, 58, 0.72);
            --bg-card-hover: rgba(30, 40, 75, 0.88);
            --accent-blue: #1a6dff;
            --accent-cyan: #00c2ff;
            --accent-glow: rgba(0, 194, 255, 0.45);
            --accent-glow-soft: rgba(26, 109, 255, 0.25);
            --text-primary: #ffffff;
            --text-secondary: #b8c4dc;
            --text-muted: #7a8aad;
            --border-glass: rgba(255, 255, 255, 0.1);
            --border-glow: rgba(0, 194, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 30px rgba(0, 194, 255, 0.2);
            --font-body: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition: all .3s cubic-bezier(.25, .46, .45, .94);
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-body);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
            padding-bottom: 80px;
        }
        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background:
                radial-gradient(ellipse at 20% 20%, rgba(26, 109, 255, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 80% 60%, rgba(0, 194, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 90%, rgba(26, 109, 255, 0.05) 0%, transparent 45%);
            pointer-events: none;
            z-index: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover,
        a:focus {
            color: #66d9ff;
            text-decoration: none;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        .container {
            max-width: 1200px;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
            position: relative;
            z-index: 1;
        }
        .container-fluid {
            position: relative;
            z-index: 1;
        }
        /* Header / Nav */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(10, 14, 26, 0.82);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-glass);
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(10, 14, 26, 0.95);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.15rem;
            color: var(--text-primary);
            letter-spacing: .3px;
            max-width: 260px;
            white-space: normal;
            line-height: 1.25;
        }
        .navbar-brand:hover,
        .navbar-brand:focus {
            color: var(--text-primary);
        }
        .navbar-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            margin-right: 8px;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .navbar-nav .nav-link {
            color: var(--text-secondary);
            font-weight: 500;
            font-size: .95rem;
            padding: 0.6rem 1rem;
            border-radius: 6px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link:focus {
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.06);
        }
        .navbar-nav .nav-link.active {
            color: var(--accent-cyan);
            font-weight: 600;
        }
        .navbar-toggler {
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            padding: .45rem .6rem;
            background: transparent;
        }
        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--accent-cyan);
        }
        .navbar-toggler-icon {
            filter: invert(1);
        }
        .btn-nav {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: .85rem;
            border-radius: 50px;
            padding: .55rem 1.2rem;
            border: 1px solid rgba(255, 255, 255, .18);
            background: transparent;
            color: var(--text-primary);
            transition: var(--transition);
        }
        .btn-nav:hover,
        .btn-nav:focus {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.08);
        }
        .btn-nav.btn-solid {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border-color: transparent;
            color: #fff;
            box-shadow: 0 0 20px var(--accent-glow-soft);
        }
        .btn-nav.btn-solid:hover,
        .btn-nav.btn-solid:focus {
            box-shadow: 0 0 32px var(--accent-glow);
            color: #fff;
            background: linear-gradient(135deg, #2580ff, #33d3ff);
        }
        /* Articles Head */
        .article-hero {
            position: relative;
            padding: 9rem 0 3.5rem;
            background: linear-gradient(180deg, rgba(13, 18, 37, 0.92) 0%, rgba(10, 14, 26, 0.96) 100%);
            border-bottom: 1px solid var(--border-glass);
            overflow: hidden;
        }
        .article-hero::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 30%, rgba(26, 109, 255, 0.15) 0%, transparent 55%),
                radial-gradient(ellipse at 75% 70%, rgba(0, 194, 255, 0.08) 0%, transparent 45%);
            pointer-events: none;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: .5rem;
            list-style: none;
            margin: 0 0 1.25rem;
            padding: 0;
            font-size: .88rem;
            color: var(--text-muted);
            position: relative;
            z-index: 1;
        }
        .article-breadcrumb a {
            color: var(--text-muted);
        }
        .article-breadcrumb a:hover {
            color: var(--accent-cyan);
        }
        .article-breadcrumb .separator {
            opacity: .55;
        }
        .article-breadcrumb .current {
            color: var(--text-secondary);
            font-weight: 600;
            max-width: 380px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .article-category-tag {
            display: inline-flex;
            align-items: center;
            gap: .45rem;
            background: rgba(0, 194, 255, 0.1);
            border: 1px solid var(--border-glow);
            color: var(--accent-cyan);
            padding: .38rem 1rem;
            border-radius: 50px;
            font-size: .8rem;
            font-weight: 600;
            letter-spacing: .3px;
            position: relative;
            z-index: 1;
            margin-bottom: 1rem;
        }
        .article-heading {
            font-size: clamp(1.75rem, 4vw, 2.75rem);
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 1.1rem;
            letter-spacing: -.2px;
            position: relative;
            z-index: 1;
        }
        .article-meta-row {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            font-size: .88rem;
            color: var(--text-muted);
            position: relative;
            z-index: 1;
        }
        .article-meta-row .meta-item {
            display: inline-flex;
            align-items: center;
            gap: .45rem;
        }
        .article-meta-row i {
            color: var(--accent-cyan);
        }
        .article-cover {
            position: relative;
            z-index: 1;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-glass);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
            margin-top: 2rem;
            background: var(--bg-card);
        }
        .article-cover img {
            width: 100%;
            object-fit: cover;
            max-height: 440px;
        }
        /* Article Layout */
        .article-main-section {
            padding: 3.5rem 0 4rem;
            position: relative;
        }
        .article-layout {
            display: grid;
            grid-template-columns: minmax(0, 720px) minmax(260px, 360px);
            gap: 3rem;
            justify-content: center;
            align-items: start;
        }
        .article-main {
            min-width: 0;
        }
        .article-prose {
            font-size: 1.06rem;
            line-height: 1.75;
            color: var(--text-secondary);
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 2.25rem 2.5rem;
            box-shadow: var(--shadow-card);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }
        .article-prose h2 {
            color: var(--text-primary);
            font-size: 1.55rem;
            font-weight: 700;
            margin: 2rem 0 1rem;
            letter-spacing: -.2px;
        }
        .article-prose h2:first-child {
            margin-top: 0;
        }
        .article-prose h3 {
            color: var(--text-primary);
            font-size: 1.25rem;
            font-weight: 650;
            margin: 1.75rem 0 .75rem;
        }
        .article-prose h4 {
            color: var(--accent-cyan);
            font-size: 1.08rem;
            font-weight: 600;
            margin: 1.5rem 0 .55rem;
        }
        .article-prose p {
            margin-bottom: 1.35rem;
        }
        .article-prose a {
            color: var(--accent-cyan);
            border-bottom: 1px dashed rgba(0, 194, 255, .4);
        }
        .article-prose a:hover {
            border-bottom-color: var(--accent-cyan);
        }
        .article-prose img {
            border-radius: var(--radius-md);
            margin: 1.75rem 0;
        }
        .article-prose ul,
        .article-prose ol {
            margin: 0 0 1.35rem 1.5rem;
            padding-left: .6rem;
        }
        .article-prose li {
            margin-bottom: .55rem;
        }
        .article-prose blockquote {
            border-left: 3px solid var(--accent-cyan);
            padding: 1.1rem 1.4rem;
            margin: 1.75rem 0;
            background: rgba(0, 194, 255, 0.05);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-prose table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            border-radius: var(--radius-sm);
            overflow: hidden;
        }
        .article-prose table th,
        .article-prose table td {
            padding: .75rem 1rem;
            border: 1px solid var(--border-glass);
            text-align: left;
        }
        .article-prose table th {
            background: rgba(0, 194, 255, 0.08);
            color: var(--text-primary);
            font-weight: 600;
        }
        .article-empty {
            text-align: center;
            padding: 4rem 2rem;
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
        }
        .article-empty i {
            font-size: 3rem;
            color: var(--text-muted);
            margin-bottom: 1rem;
        }
        .article-empty h2 {
            font-size: 1.6rem;
            color: var(--text-primary);
            margin-bottom: .8rem;
        }
        .article-empty p {
            color: var(--text-muted);
            margin-bottom: 1.5rem;
        }
        /* Sidebar */
        .article-sidebar {
            position: sticky;
            top: 100px;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .sidebar-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 1.25rem;
            box-shadow: var(--shadow-card);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }
        .sidebar-card .sidebar-heading {
            font-size: .92rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: .3px;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: .5rem;
        }
        .sidebar-card .sidebar-heading i {
            color: var(--accent-cyan);
        }
        .share-list {
            display: flex;
            flex-wrap: wrap;
            gap: .65rem;
        }
        .share-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border-glass);
            color: var(--text-secondary);
            font-size: 1rem;
            transition: var(--transition);
        }
        .share-btn:hover,
        .share-btn:focus {
            background: rgba(0, 194, 255, 0.12);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            box-shadow: 0 0 18px var(--accent-glow-soft);
            transform: translateY(-2px);
        }
        .quick-link-list {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: .55rem;
        }
        .quick-link-list a {
            display: flex;
            align-items: center;
            gap: .6rem;
            color: var(--text-secondary);
            font-size: .92rem;
            padding: .6rem .8rem;
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            transition: var(--transition);
        }
        .quick-link-list a:hover,
        .quick-link-list a:focus {
            background: rgba(0, 194, 255, 0.06);
            border-color: var(--border-glass);
            color: var(--accent-cyan);
        }
        .quick-link-list i {
            width: 18px;
            text-align: center;
            color: var(--accent-cyan);
            font-size: .85rem;
        }
        /* Related */
        .related-section {
            padding: 3rem 0 4.5rem;
            position: relative;
        }
        .section-lead {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 680px;
            margin-bottom: 2rem;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .related-card {
            display: block;
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .related-card:hover {
            border-color: var(--border-glow);
            box-shadow: 0 0 32px var(--accent-glow-soft);
            transform: translateY(-6px);
            background: var(--bg-card-hover);
        }
        .related-card .card-img-wrap {
            height: 180px;
            overflow: hidden;
            border-bottom: 1px solid var(--border-glass);
        }
        .related-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .related-card:hover .card-img-wrap img {
            transform: scale(1.06);
        }
        .related-card .card-body {
            padding: 1.25rem;
        }
        .related-card .card-tag {
            display: inline-block;
            font-size: .72rem;
            font-weight: 600;
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.08);
            padding: .25rem .75rem;
            border-radius: 50px;
            margin-bottom: .7rem;
            letter-spacing: .3px;
        }
        .related-card .card-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
            line-height: 1.45;
        }
        .related-card:hover .card-title {
            color: var(--accent-cyan);
        }
        /* FAQ */
        .faq-section {
            padding: 3.5rem 0 4rem;
            position: relative;
            background: rgba(13, 18, 37, 0.55);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            margin-bottom: 1rem;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-glow);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.1rem 1.3rem;
            background: transparent;
            border: none;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 1rem;
            text-align: left;
            cursor: pointer;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--accent-cyan);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 194, 255, 0.08);
            color: var(--accent-cyan);
            font-size: .85rem;
            transition: var(--transition);
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
            background: rgba(0, 194, 255, 0.16);
        }
        .faq-answer {
            overflow: hidden;
            max-height: 0;
            transition: max-height .45s cubic-bezier(.25, .46, .45, .94);
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
        }
        .faq-answer-inner {
            padding: 0 1.3rem 1.25rem;
            color: var(--text-secondary);
            font-size: .95rem;
            line-height: 1.7;
        }
        /* CTA Panel */
        .cta-section {
            padding: 4rem 0 5rem;
            position: relative;
        }
        .cta-panel {
            background: linear-gradient(135deg, rgba(26, 109, 255, 0.14) 0%, rgba(0, 194, 255, 0.08) 100%);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            padding: 3rem 2.5rem;
            position: relative;
            overflow: hidden;
            box-shadow: 0 0 60px rgba(0, 194, 255, 0.12);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .cta-panel::before {
            content: "";
            position: absolute;
            top: -80px;
            right: -80px;
            width: 240px;
            height: 240px;
            border-radius: 50%;
            background: rgba(0, 194, 255, 0.12);
            filter: blur(45px);
            pointer-events: none;
        }
        .cta-panel .cta-title {
            font-size: clamp(1.5rem, 3vw, 2.1rem);
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: .9rem;
            letter-spacing: -.2px;
            position: relative;
            z-index: 1;
        }
        .cta-panel .cta-desc {
            font-size: 1.02rem;
            color: var(--text-secondary);
            max-width: 620px;
            line-height: 1.7;
            margin-bottom: 1.75rem;
            position: relative;
            z-index: 1;
        }
        .cta-form {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            position: relative;
            z-index: 1;
        }
        .cta-form .form-control {
            flex: 1;
            min-width: 220px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border-glass);
            border-radius: 50px;
            padding: .8rem 1.4rem;
            color: var(--text-primary);
            font-size: .95rem;
            transition: var(--transition);
        }
        .cta-form .form-control::placeholder {
            color: var(--text-muted);
        }
        .cta-form .form-control:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 3px rgba(0, 194, 255, .12);
            background: rgba(255, 255, 255, 0.08);
        }
        .btn-neon {
            display: inline-flex;
            align-items: center;
            gap: .55rem;
            font-weight: 700;
            font-size: .95rem;
            border-radius: 50px;
            padding: .8rem 1.9rem;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border: none;
            color: #fff;
            box-shadow: 0 0 24px var(--accent-glow-soft);
            transition: var(--transition);
            cursor: pointer;
            text-decoration: none;
        }
        .btn-neon:hover,
        .btn-neon:focus {
            color: #fff;
            box-shadow: 0 0 40px var(--accent-glow);
            background: linear-gradient(135deg, #2580ff, #33d3ff);
            transform: translateY(-2px);
        }
        .btn-neon.btn-sm {
            padding: .65rem 1.4rem;
            font-size: .88rem;
        }
        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-glass);
            padding: 3.5rem 0 1.5rem;
            position: relative;
            z-index: 1;
        }
        .footer-brand {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.5;
        }
        .site-footer p {
            color: var(--text-muted);
            font-size: .92rem;
            line-height: 1.7;
        }
        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: .55rem;
        }
        .footer-links a {
            color: var(--text-muted);
            font-size: .92rem;
            transition: var(--transition);
        }
        .footer-links a:hover,
        .footer-links a:focus {
            color: var(--accent-cyan);
        }
        .footer-divider {
            height: 1px;
            background: var(--border-glass);
            margin: 2rem 0 1rem;
        }
        .footer-copyright {
            font-size: .85rem;
            color: var(--text-muted);
            margin: 0;
        }
        /* Bottom Fixed CTA Bar */
        .bottom-cta-bar {
            position: fixed;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 1040;
            background: rgba(10, 14, 26, 0.94);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--border-glow);
            box-shadow: 0 -8px 28px rgba(0, 0, 0, 0.5);
            padding: .75rem 0;
        }
        .bottom-cta-bar .bottom-cta-text {
            display: flex;
            flex-direction: column;
            gap: .1rem;
        }
        .bottom-cta-bar .bottom-cta-title {
            font-size: .95rem;
            font-weight: 700;
            color: var(--text-primary);
        }
        .bottom-cta-bar .bottom-cta-desc {
            font-size: .8rem;
            color: var(--text-muted);
        }
        /* FAB */
        .fab-neon {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 1060;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: 50px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid;
            border-image: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue)) 1;
            box-shadow: 0 0 18px rgba(0, 194, 255, 0.45);
            color: var(--accent-cyan);
            font-size: 1.2rem;
            transition: var(--transition);
            opacity: .65;
        }
        .fab-neon:hover,
        .fab-neon:focus {
            opacity: 1;
            transform: scale(1.12);
            box-shadow: 0 0 32px rgba(0, 194, 255, 0.65);
            color: #fff;
        }
        .fab-neon:active {
            transform: scale(.95);
        }
        .fab-neon .fab-notification {
            position: absolute;
            top: 4px;
            right: 4px;
            width: 10px;
            height: 10px;
            background: #ff007f;
            border-radius: 50%;
            box-shadow: 0 0 8px rgba(255, 0, 127, 0.8);
            animation: fabPulse 2s infinite;
        }
        @keyframes fabPulse {
            0%, 100% { opacity: 1; }
            50% { opacity: .35; }
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .container {
                padding-left: 1.25rem;
                padding-right: 1.25rem;
            }
            .article-layout {
                grid-template-columns: minmax(0, 1fr);
                gap: 2.25rem;
            }
            .article-sidebar {
                position: static;
                flex-direction: row;
                flex-wrap: wrap;
            }
            .sidebar-card {
                flex: 1;
                min-width: 240px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            body {
                padding-bottom: 90px;
            }
            .article-hero {
                padding: 7.5rem 0 2.5rem;
            }
            .article-heading {
                font-size: 1.55rem;
            }
            .article-prose {
                padding: 1.5rem 1.25rem;
                font-size: .98rem;
            }
            .article-meta-row {
                gap: .75rem;
                font-size: .8rem;
            }
            .related-section {
                padding: 2.5rem 0 3rem;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .cta-panel {
                padding: 2rem 1.4rem;
            }
            .cta-form {
                flex-direction: column;
            }
            .cta-form .form-control {
                min-width: auto;
                width: 100%;
            }
            .btn-neon {
                justify-content: center;
                width: 100%;
            }
            .bottom-cta-bar .bottom-cta-desc {
                display: none;
            }
            .bottom-cta-bar .bottom-cta-title {
                font-size: .85rem;
            }
            .bottom-cta-bar .btn-neon {
                width: auto;
                padding: .55rem 1.1rem;
                font-size: .8rem;
            }
            .article-breadcrumb .current {
                max-width: 180px;
            }
            .navbar-brand {
                font-size: .95rem;
                max-width: 190px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .article-hero {
                padding: 7rem 0 2rem;
            }
            .article-heading {
                font-size: 1.35rem;
                line-height: 1.4;
            }
            .article-prose {
                padding: 1.25rem 1rem;
                font-size: .94rem;
                line-height: 1.7;
            }
            .article-prose h2 {
                font-size: 1.3rem;
            }
            .article-prose h3 {
                font-size: 1.12rem;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .cta-panel {
                padding: 1.75rem 1.1rem;
            }
            .cta-panel .cta-title {
                font-size: 1.35rem;
            }
            .fab-neon {
                width: 46px;
                height: 46px;
                bottom: 5.5rem;
                left: .75rem;
                font-size: 1rem;
            }
            .bottom-cta-bar {
                padding: .6rem 0;
            }
            .bottom-cta-bar .bottom-cta-title {
                font-size: .78rem;
                max-width: 160px;
                line-height: 1.35;
            }
            .article-meta-row {
                flex-direction: column;
                align-items: flex-start;
                gap: .45rem;
            }
            .article-breadcrumb {
                font-size: .8rem;
                gap: .35rem;
            }
            .article-breadcrumb .current {
                max-width: 130px;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0a0e1a;
            --bg-secondary: #0d1225;
            --bg-card: rgba(22, 30, 58, 0.72);
            --bg-card-hover: rgba(30, 40, 75, 0.88);
            --accent-blue: #1a6dff;
            --accent-cyan: #00c2ff;
            --accent-glow: rgba(0, 194, 255, 0.45);
            --accent-glow-soft: rgba(26, 109, 255, 0.25);
            --text-primary: #ffffff;
            --text-secondary: #b8c4dc;
            --text-muted: #7a8aad;
            --border-glass: rgba(255, 255, 255, 0.1);
            --border-glow: rgba(0, 194, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-xl: 32px;
            --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 30px rgba(0, 194, 255, 0.2);
            --font-body: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
            --transition: all .3s cubic-bezier(.25, .46, .45, .94);
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-body);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
        }
        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background:
                radial-gradient(ellipse at 20% 20%, rgba(26, 109, 255, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 80% 60%, rgba(0, 194, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 90%, rgba(26, 109, 255, 0.05) 0%, transparent 45%);
            pointer-events: none;
            z-index: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover,
        a:focus {
            color: #66d9ff;
            text-decoration: none;
        }
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        .container {
            max-width: 1200px;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
            position: relative;
            z-index: 1;
        }
        .container-fluid {
            position: relative;
            z-index: 1;
        }
        /* Header / Nav */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(10, 14, 26, 0.82);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-glass);
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(10, 14, 26, 0.95);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.15rem;
            color: var(--text-primary);
            letter-spacing: .3px;
            max-width: 260px;
            white-space: normal;
            line-height: 1.25;
        }
        .navbar-brand:hover,
        .navbar-brand:focus {
            color: var(--text-primary);
        }
        .navbar-brand .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            margin-right: 8px;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .navbar-nav .nav-link {
            color: var(--text-secondary);
            font-weight: 500;
            font-size: .95rem;
            padding: 0.6rem 1rem;
            border-radius: 6px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link:focus {
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.06);
        }
        .navbar-nav .nav-link.active {
            color: var(--accent-cyan);
            font-weight: 600;
        }
        .navbar-toggler {
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            padding: .45rem .6rem;
            background: transparent;
        }
        .navbar-toggler:focus {
            box-shadow: none;
            outline: 2px solid var(--accent-cyan);
        }
        .navbar-toggler-icon {
            filter: invert(1);
        }
        .btn-nav {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: .85rem;
            border-radius: 50px;
            padding: .55rem 1.2rem;
            border: 1px solid rgba(255, 255, 255, .18);
            background: transparent;
            color: var(--text-primary);
            transition: var(--transition);
            white-space: nowrap;
        }
        .btn-nav:hover,
        .btn-nav:focus {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 194, 255, 0.08);
        }
        .btn-nav.btn-solid {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border-color: transparent;
            color: #fff;
            box-shadow: 0 0 20px var(--accent-glow-soft);
        }
        .btn-nav.btn-solid:hover,
        .btn-nav.btn-solid:focus {
            box-shadow: 0 0 32px var(--accent-glow);
            color: #fff;
            background: linear-gradient(135deg, #2580ff, #33d3ff);
        }
        /* Hero Bento */
        .hero-bento {
            padding: 120px 0 60px;
            position: relative;
        }
        .hero-bento::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 100%;
            background: url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            opacity: 0.12;
            z-index: 0;
            pointer-events: none;
        }
        .hero-bento .container {
            position: relative;
            z-index: 1;
        }
        .bento-main {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-xl);
            padding: 2.5rem;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            height: 100%;
            position: relative;
            overflow: hidden;
        }
        .bento-main::after {
            content: "";
            position: absolute;
            top: -50%;
            right: -30%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(0, 194, 255, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .bento-main:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow), var(--shadow-card);
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 194, 255, 0.12);
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: .8rem;
            padding: .4rem 1rem;
            border-radius: 50px;
            border: 1px solid rgba(0, 194, 255, 0.25);
            margin-bottom: 1.25rem;
            letter-spacing: .5px;
        }
        .hero-badge i {
            font-size: .9rem;
        }
        .bento-main h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 1rem;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .bento-main h1 span {
            background: linear-gradient(135deg, var(--accent-cyan), #6bd4ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .bento-main p.lead-text {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 1.75rem;
            max-width: 560px;
        }
        .bento-main .btn-group-cta {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .btn-glow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1rem;
            border-radius: 50px;
            padding: .8rem 1.8rem;
            border: none;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            transition: var(--transition);
            box-shadow: 0 0 25px var(--accent-glow-soft);
            cursor: pointer;
        }
        .btn-glow:hover,
        .btn-glow:focus {
            box-shadow: 0 0 45px var(--accent-glow);
            color: #fff;
            background: linear-gradient(135deg, #2580ff, #33d3ff);
            transform: translateY(-2px);
        }
        .btn-outline-glow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            font-size: .95rem;
            border-radius: 50px;
            padding: .75rem 1.5rem;
            border: 1px solid rgba(0, 194, 255, 0.4);
            background: transparent;
            color: var(--accent-cyan);
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-outline-glow:hover,
        .btn-outline-glow:focus {
            background: rgba(0, 194, 255, 0.1);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0, 194, 255, 0.15);
        }
        .bento-small {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            min-height: 140px;
        }
        .bento-small:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow), var(--shadow-card);
            transform: translateY(-3px);
        }
        .bento-small .bento-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: rgba(0, 194, 255, 0.12);
            color: var(--accent-cyan);
            font-size: 1.1rem;
            margin-bottom: .75rem;
            flex-shrink: 0;
        }
        .bento-small h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: .4rem;
        }
        .bento-small p {
            font-size: .85rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.55;
        }
        .bento-cta-bar {
            margin-top: 1.5rem;
            background: rgba(22, 30, 58, 0.8);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 1rem 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            flex-wrap: wrap;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }
        .bento-cta-bar p {
            margin: 0;
            font-size: .9rem;
            color: var(--text-secondary);
        }
        .bento-cta-bar p strong {
            color: var(--text-primary);
        }
        /* Section */
        .section-block {
            padding: 70px 0;
            position: relative;
        }
        .section-block.alt-bg {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }
        .section-label {
            display: inline-block;
            font-size: .8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--accent-cyan);
            margin-bottom: 1rem;
        }
        .section-title {
            font-size: 1.9rem;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 1rem;
            letter-spacing: -0.4px;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 680px;
        }
        .divider-line {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            border-radius: 10px;
            margin: 1.25rem 0 1.5rem;
        }
        /* Feature items */
        .feature-item {
            display: flex;
            gap: 1.25rem;
            align-items: flex-start;
            padding: 1.25rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .feature-item:last-child {
            border-bottom: none;
        }
        .feature-item .feature-icon {
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            height: 50px;
            border-radius: var(--radius-md);
            background: rgba(0, 194, 255, 0.1);
            color: var(--accent-cyan);
            font-size: 1.2rem;
            border: 1px solid rgba(0, 194, 255, 0.2);
        }
        .feature-item h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: .35rem;
        }
        .feature-item p {
            font-size: .92rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }
        /* Steps */
        .step-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
            margin-top: 2.5rem;
        }
        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: 1.75rem 1.5rem;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .step-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            opacity: 0;
            transition: var(--transition);
        }
        .step-card:hover::before {
            opacity: 1;
        }
        .step-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow), var(--shadow-card);
        }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            margin-bottom: 1rem;
        }
        .step-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: .6rem;
        }
        .step-card p {
            font-size: .9rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.65;
        }
        /* Image showcase */
        .showcase-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin-top: 2.5rem;
        }
        .showcase-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-glass);
            transition: var(--transition);
            background: var(--bg-card);
        }
        .showcase-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow), var(--shadow-card);
        }
        .showcase-card img {
            width: 100%;
            height: 260px;
            object-fit: cover;
            transition: var(--transition);
        }
        .showcase-card:hover img {
            transform: scale(1.04);
        }
        .showcase-card .showcase-body {
            padding: 1.25rem 1.5rem 1.5rem;
            position: relative;
        }
        .showcase-card .showcase-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: .4rem;
        }
        .showcase-card .showcase-body p {
            font-size: .88rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }
        .showcase-tag {
            display: inline-block;
            font-size: .72rem;
            font-weight: 600;
            padding: .25rem .7rem;
            border-radius: 50px;
            background: rgba(0, 194, 255, 0.12);
            color: var(--accent-cyan);
            margin-bottom: .6rem;
            letter-spacing: .5px;
        }
        /* Stats */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.25rem;
        }
        .stat-item {
            text-align: center;
            padding: 1.5rem 1rem;
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            transition: var(--transition);
        }
        .stat-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }
        .stat-item .stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-cyan);
            letter-spacing: -1px;
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: .82rem;
            color: var(--text-muted);
            margin-top: .3rem;
        }
        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin-top: 2rem;
        }
        .faq-list .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md) !important;
            margin-bottom: .8rem;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-list .accordion-item:hover {
            border-color: var(--border-glow);
        }
        .faq-list .accordion-button {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            font-size: .95rem;
            padding: 1.1rem 1.5rem;
            border: none;
            box-shadow: none;
            transition: var(--transition);
        }
        .faq-list .accordion-button:not(.collapsed) {
            background: rgba(0, 194, 255, 0.06);
            color: var(--accent-cyan);
        }
        .faq-list .accordion-button:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: -2px;
            box-shadow: none;
        }
        .faq-list .accordion-button::after {
            filter: invert(0.7);
        }
        .faq-list .accordion-body {
            background: transparent;
            color: var(--text-secondary);
            font-size: .9rem;
            line-height: 1.7;
            padding: 0 1.5rem 1.25rem;
        }
        /* CTA section */
        .cta-section {
            padding: 80px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-3.jpg') center/cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-card {
            background: rgba(22, 30, 58, 0.9);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-xl);
            padding: 3rem 2.5rem;
            text-align: center;
            box-shadow: var(--shadow-glow), var(--shadow-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            position: relative;
            z-index: 1;
        }
        .cta-card h2 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: .8rem;
            letter-spacing: -0.4px;
        }
        .cta-card p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto 1.75rem;
            line-height: 1.7;
        }
        /* Bottom fixed bar */
        .bottom-fixed-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1030;
            background: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--border-glass);
            padding: .8rem 0;
            display: none;
        }
        .bottom-fixed-bar.show {
            display: block;
        }
        .bottom-fixed-bar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .bottom-fixed-bar p {
            margin: 0;
            font-size: .88rem;
            color: var(--text-secondary);
        }
        .bottom-fixed-bar p strong {
            color: var(--text-primary);
        }
        /* FAB */
        .fab-left {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 1040;
            cursor: pointer;
        }
        .fab-neon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), linear-gradient(135deg, #00ff88, #00c2ff);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            color: var(--accent-cyan);
            font-size: 1.4rem;
            box-shadow: 0 0 15px rgba(0, 194, 255, 0.4);
            transition: var(--transition);
            animation: fabBreathe 3s ease-in-out infinite;
        }
        .fab-neon:hover {
            box-shadow: 0 0 32px rgba(0, 194, 255, 0.6);
            transform: scale(1.1);
            animation: none;
        }
        .fab-neon:active {
            transform: scale(0.95);
        }
        @keyframes fabBreathe {
            0%, 100% { box-shadow: 0 0 15px rgba(0, 194, 255, 0.3); opacity: 0.7; }
            50% { box-shadow: 0 0 28px rgba(0, 194, 255, 0.55); opacity: 1; }
        }
        .fab-notification {
            position: absolute;
            top: -2px;
            right: -2px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: #ff2d55;
            border: 2px solid rgba(0, 0, 0, 0.7);
            animation: blinkDot 1.5s ease-in-out infinite;
        }
        @keyframes blinkDot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.3; }
        }
        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-glass);
            padding: 3.5rem 0 2rem;
            position: relative;
            z-index: 1;
        }
        .footer-brand {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
        }
        .site-footer p {
            font-size: .88rem;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: .5rem;
        }
        .footer-links a {
            font-size: .88rem;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .footer-links a:hover,
        .footer-links a:focus {
            color: var(--accent-cyan);
        }
        .footer-divider {
            border-top: 1px solid var(--border-glass);
            margin: 2rem 0 1.25rem;
        }
        .footer-copyright {
            font-size: .8rem;
            color: var(--text-muted);
            margin: 0;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .bento-main h1 {
                font-size: 2rem;
            }
            .step-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .bento-main {
                padding: 1.75rem;
            }
            .bento-main h1 {
                font-size: 1.7rem;
            }
            .hero-bento {
                padding: 100px 0 40px;
            }
            .section-block {
                padding: 50px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .step-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .showcase-grid {
                grid-template-columns: 1fr;
                gap: 1.25rem;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: .75rem;
            }
            .cta-card {
                padding: 2rem 1.25rem;
            }
            .cta-card h2 {
                font-size: 1.5rem;
            }
            .bento-cta-bar {
                flex-direction: column;
                align-items: flex-start;
            }
            .fab-left {
                bottom: 5.5rem;
                left: 0.75rem;
            }
            .fab-neon {
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
            }
            .navbar-brand {
                font-size: 0.95rem;
                max-width: 180px;
            }
        }
        @media (max-width: 520px) {
            .bento-main h1 {
                font-size: 1.4rem;
            }
            .bento-main p.lead-text {
                font-size: .95rem;
            }
            .btn-glow,
            .btn-outline-glow {
                font-size: .85rem;
                padding: .65rem 1.2rem;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
            }
            .stat-item .stat-number {
                font-size: 1.5rem;
            }
            .cta-card h2 {
                font-size: 1.3rem;
            }
            .bottom-fixed-bar .container {
                flex-direction: column;
                align-items: flex-start;
            }
            .navbar-brand {
                font-size: 0.85rem;
                max-width: 150px;
            }
            .navbar-brand .brand-icon {
                width: 30px;
                height: 30px;
                font-size: .8rem;
                margin-right: 5px;
            }
        }