/* roulang page: index */
:root {
            --bg-primary: #121212;
            --bg-secondary: #1C1C1E;
            --bg-card: #18181A;
            --accent-gold: #C5A059;
            --accent-amber: #FFBF00;
            --text-white: #F5F5F7;
            --text-muted: #D4AC0D;
            --text-soft: #A8A29E;
            --border-gold: rgba(197, 160, 89, 0.35);
            --shadow-gold: 0 8px 30px rgba(197, 160, 89, 0.12);
            --radius-lg: 18px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition: all 0.25s ease;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Be Vietnam Pro', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        img { max-width: 100%; display: block; }

        /* Container */
        .container-custom { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* Header/Navbar */
        .navbar-custom {
            background: rgba(18, 18, 18, 0.97);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-gold);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 1030;
        }
        .navbar-custom .navbar-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--accent-gold);
            letter-spacing: -0.5px;
        }
        .navbar-custom .navbar-brand span { color: var(--text-white); }
        .navbar-custom .nav-link {
            color: var(--text-soft);
            font-weight: 500;
            font-size: 0.95rem;
            margin: 0 8px;
            padding: 8px 12px;
            border-radius: 8px;
        }
        .navbar-custom .nav-link:hover,
        .navbar-custom .nav-link.active {
            color: var(--accent-amber);
            background: rgba(255, 191, 0, 0.08);
        }
        .navbar-custom .btn-login {
            color: var(--text-white);
            border: 1px solid rgba(255,255,255,0.3);
            background: transparent;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 8px;
            margin-right: 6px;
        }
        .navbar-custom .btn-login:hover {
            border-color: var(--accent-gold);
            color: var(--accent-amber);
        }
        .navbar-custom .btn-signup {
            background: linear-gradient(135deg, var(--accent-amber), var(--accent-gold));
            color: #121212;
            font-weight: 700;
            padding: 8px 20px;
            border-radius: 8px;
            border: none;
        }
        .navbar-custom .btn-signup:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(197,160,89,0.4);
        }
        .navbar-custom .navbar-toggler {
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
        }
        .navbar-custom .navbar-toggler:focus { box-shadow: none; }
        .navbar-custom .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%23C5A059' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* Hero */
        .hero {
            position: relative;
            min-height: 90vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 50%, #121212 100%);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background-image: url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            z-index: 1;
        }
        .hero .container-custom {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .hero-inner {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 50px;
            align-items: center;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(197,160,89,0.15);
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .hero h1 {
            font-size: clamp(2rem, 4vw, 3.2rem);
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 18px;
            color: #fff;
        }
        .hero h1 em { color: var(--accent-amber); font-style: normal; }
        .hero-lead {
            font-size: 1.1rem;
            color: var(--text-soft);
            max-width: 540px;
            margin-bottom: 30px;
            line-height: 1.7;
        }
        .hero-cta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 35px;
        }
        .btn-gold {
            background: linear-gradient(135deg, #FFBF00, #C5A059);
            color: #121212;
            font-weight: 700;
            padding: 14px 30px;
            border-radius: 10px;
            border: none;
            box-shadow: 0 8px 25px rgba(255,191,0,0.3);
            transition: var(--transition);
        }
        .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(255,191,0,0.5);
            color: #121212;
        }
        .btn-outline-gold {
            background: transparent;
            border: 1px solid var(--accent-gold);
            color: var(--accent-gold);
            font-weight: 600;
            padding: 14px 28px;
            border-radius: 10px;
            transition: var(--transition);
        }
        .btn-outline-gold:hover {
            background: rgba(197,160,89,0.1);
            border-color: var(--accent-amber);
            color: var(--accent-amber);
        }
        .hero-stats {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
        }
        .hero-stat {
            display: flex;
            flex-direction: column;
        }
        .hero-stat .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-amber);
            line-height: 1.2;
        }
        .hero-stat .stat-label {
            color: var(--text-soft);
            font-size: 0.9rem;
        }
        .hero-product {
            background: rgba(28,28,30,0.8);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-lg);
            padding: 20px;
            box-shadow: var(--shadow-gold);
            backdrop-filter: blur(10px);
        }
        .hero-product .tool-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 15px;
        }
        .hero-product .tool-icon {
            width: 45px; height: 45px;
            background: rgba(255,191,0,0.15);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-amber);
            font-size: 1.3rem;
        }
        .hero-product .tool-title {
            font-weight: 700;
            font-size: 1.1rem;
        }
        .hero-product .tool-status {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            color: #4ade80;
        }
        .hero-product .tool-status i { font-size: 0.7rem; animation: pulse 1.5s infinite; }
        .hero-product img {
            border-radius: 10px;
            border: 1px solid rgba(197,160,89,0.2);
            margin-bottom: 15px;
            width: 100%;
            object-fit: cover;
            height: 240px;
        }
        .tool-metrics {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }
        .tool-metric {
            background: rgba(255,255,255,0.03);
            border-radius: 8px;
            padding: 10px;
            text-align: center;
        }
        .tool-metric .metric-value { font-weight: 800; color: var(--accent-amber); font-size: 1.2rem; }
        .tool-metric .metric-label { font-size: 0.75rem; color: var(--text-soft); }

        /* Sections */
        section { padding: 80px 0; }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }
        .section-subtitle {
            color: var(--text-soft);
            font-size: 1rem;
            max-width: 700px;
            line-height: 1.7;
            margin-bottom: 40px;
        }
        .section-header { margin-bottom: 40px; }
        .section-header .badge-label {
            display: inline-block;
            background: rgba(197,160,89,0.12);
            color: var(--accent-gold);
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 25px;
        }
        .feature-item {
            background: var(--bg-card);
            border: 1px solid rgba(197,160,89,0.15);
            border-radius: var(--radius-md);
            padding: 25px;
            transition: var(--transition);
        }
        .feature-item:hover {
            border-color: var(--accent-gold);
            transform: translateY(-4px);
            box-shadow: var(--shadow-gold);
        }
        .feature-icon {
            width: 50px; height: 50px;
            border-radius: 12px;
            background: rgba(255,191,0,0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-amber);
            font-size: 1.4rem;
            margin-bottom: 18px;
        }
        .feature-item h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }
        .feature-item p {
            color: var(--text-soft);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        .game-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 25px;
        }
        .game-card {
            background: var(--bg-card);
            border: 1px solid rgba(197,160,89,0.15);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .game-card:hover {
            border-color: var(--accent-gold);
            transform: translateY(-5px);
            box-shadow: 0 14px 30px rgba(0,0,0,0.5);
        }
        .game-card img {
            height: 160px;
            width: 100%;
            object-fit: cover;
            display: block;
        }
        .game-card-body {
            padding: 18px;
        }
        .game-card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .game-card-body p {
            font-size: 0.85rem;
            color: var(--text-soft);
            margin-bottom: 0;
        }

        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }
        .testimonial-card {
            background: var(--bg-card);
            border: 1px solid rgba(197,160,89,0.2);
            border-radius: var(--radius-md);
            padding: 25px;
            position: relative;
        }
        .testimonial-card::before {
            content: '\201C';
            font-size: 4rem;
            color: var(--accent-gold);
            opacity: 0.3;
            position: absolute;
            top: 5px; left: 15px;
            line-height: 1;
        }
        .testimonial-text {
            color: #ECECEC;
            line-height: 1.7;
            margin-bottom: 20px;
            position: relative;
            z-index: 1;
        }
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-avatar {
            width: 45px; height: 45px;
            border-radius: 50%;
            background: rgba(197,160,89,0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--accent-amber);
        }
        .testimonial-name {
            font-weight: 600;
            color: #fff;
        }
        .testimonial-role {
            font-size: 0.8rem;
            color: var(--text-soft);
        }

        .news-section {
            background: var(--bg-secondary);
            border-top: 1px solid rgba(197,160,89,0.1);
            border-bottom: 1px solid rgba(197,160,89,0.1);
        }
        .news-list {
            list-style: none;
            padding: 0;
        }
        .news-item {
            border-bottom: 1px solid rgba(255,255,255,0.05);
            padding: 18px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
        }
        .news-item:last-child { border-bottom: none; }
        .news-item h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 5px;
        }
        .news-item h3 a { color: #fff; }
        .news-item h3 a:hover { color: var(--accent-amber); }
        .news-item .news-meta {
            color: var(--text-soft);
            font-size: 0.85rem;
        }
        .news-item .news-excerpt {
            color: var(--text-soft);
            font-size: 0.9rem;
            margin-bottom: 0;
        }
        .news-item .news-arrow {
            color: var(--accent-gold);
            font-size: 1.2rem;
            flex-shrink: 0;
        }

        .security-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 25px;
        }
        .security-item {
            text-align: left;
            background: rgba(255,255,255,0.02);
            border-radius: var(--radius-md);
            padding: 25px;
            border: 1px solid rgba(197,160,89,0.1);
        }
        .security-item i {
            font-size: 2rem;
            color: var(--accent-gold);
            margin-bottom: 15px;
        }
        .security-item h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .security-item p {
            color: var(--text-soft);
            font-size: 0.9rem;
            margin-bottom: 0;
        }

        .faq-section { background: var(--bg-secondary); }
        .accordion-button {
            background: var(--bg-card);
            color: #fff;
            border: 1px solid rgba(197,160,89,0.15);
            border-radius: var(--radius-sm) !important;
            padding: 18px 20px;
            font-weight: 600;
        }
        .accordion-button:not(.collapsed) {
            background: rgba(197,160,89,0.1);
            color: var(--accent-amber);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: none;
            border-color: var(--accent-gold);
        }
        .accordion-button::after {
            filter: brightness(0) invert(1) sepia(1) saturate(5) hue-rotate(30deg);
        }
        .accordion-item {
            margin-bottom: 12px;
            border: none;
            background: transparent;
        }
        .accordion-body {
            background: var(--bg-card);
            color: var(--text-soft);
            border-radius: 0 0 var(--radius-sm) var(--radius-sm);
            line-height: 1.7;
        }

        .cta-section {
            background: linear-gradient(135deg, #1a1a1a 0%, #2a1f0a 100%);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: center;
            margin: 0 auto;
            max-width: 1000px;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 15px;
        }
        .cta-section p {
            color: var(--text-soft);
            max-width: 600px;
            margin: 0 auto 30px;
        }

        .footer-custom {
            background: #0d0d0d;
            border-top: 1px solid rgba(197,160,89,0.2);
            padding: 50px 0 20px;
            margin-top: 80px;
        }
        .footer-brand {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent-gold);
            margin-bottom: 15px;
        }
        .footer-brand span { color: #fff; }
        .footer-text {
            color: var(--text-soft);
            font-size: 0.9rem;
            max-width: 400px;
            line-height: 1.7;
        }
        .footer-links {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: var(--text-soft);
            font-size: 0.95rem;
        }
        .footer-links a:hover {
            color: var(--accent-amber);
            padding-left: 5px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
            color: var(--text-soft);
            font-size: 0.85rem;
        }

        /* Floating conversion bar */
        .floating-cta {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(18,18,18,0.95);
            backdrop-filter: blur(15px);
            border-top: 1px solid var(--accent-gold);
            padding: 12px 20px;
            z-index: 1040;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
            box-shadow: 0 -5px 20px rgba(0,0,0,0.5);
        }
        .floating-cta .fc-text {
            font-weight: 600;
            color: #fff;
        }
        .floating-cta .fc-text small {
            display: block;
            color: var(--text-soft);
            font-weight: 400;
        }
        .floating-cta .btn-gold {
            white-space: nowrap;
            padding: 10px 24px;
        }

        /* FAB */
        .fab-custom {
            position: fixed;
            left: 24px;
            bottom: 100px;
            z-index: 1050;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            background: rgba(0,0,0,0.7);
            backdrop-filter: blur(10px);
            border-radius: 50px;
            border: 2px solid transparent;
            background-clip: padding-box;
            transition: all 0.3s ease;
            box-shadow: 0 0 15px rgba(0,240,255,0.3);
            cursor: pointer;
        }
        .fab-custom::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50px;
            background: linear-gradient(135deg, #CCFF00, #00F0FF);
            z-index: -1;
            transition: opacity 0.3s;
        }
        .fab-custom::after {
            content: '';
            position: absolute;
            inset: 1px;
            border-radius: 50px;
            background: #121212;
            z-index: -1;
        }
        .fab-custom:hover {
            box-shadow: 0 0 30px rgba(0,240,255,0.6);
            transform: scale(1.1);
        }
        .fab-custom i {
            color: #00F0FF;
            font-size: 1.4rem;
            z-index: 1;
        }
        .fab-notification {
            position: absolute;
            top: -5px;
            right: -5px;
            width: 12px;
            height: 12px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid #121212;
            animation: blink 1.2s infinite;
            z-index: 2;
        }
        @keyframes blink {
            0%,100% { opacity: 1; }
            50% { opacity: 0.3; }
        }
        @keyframes pulse {
            0%,100% { transform: scale(1); }
            50% { transform: scale(1.5); }
        }

        /* Vertical cards (竖屏种草) */
        .vertical-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 25px;
        }
        .vertical-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid rgba(197,160,89,0.15);
            transition: var(--transition);
            cursor: pointer;
        }
        .vertical-card:hover {
            transform: translateY(-6px);
            border-color: var(--accent-gold);
        }
        .vertical-card .vc-img {
            height: 220px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .vertical-card .vc-img .vc-tag {
            position: absolute;
            top: 10px;
            left: 10px;
            background: rgba(0,0,0,0.7);
            color: var(--accent-amber);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .vertical-card .vc-body {
            padding: 18px;
        }
        .vertical-card .vc-body h3 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .vertical-card .vc-body p {
            color: var(--text-soft);
            font-size: 0.85rem;
            margin-bottom: 12px;
        }
        .vertical-card .vc-body .vc-link {
            color: var(--accent-gold);
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        /* Responsive adjustments */
        @media (max-width: 992px) {
            .hero-inner { grid-template-columns: 1fr; gap: 35px; }
            .hero { min-height: auto; padding: 80px 0 60px; }
            .hero-product img { height: 200px; }
            .cta-section { padding: 40px 20px; }
        }
        @media (max-width: 768px) {
            .navbar-custom .nav-link { margin: 4px 0; }
            .navbar-custom .d-flex.buttons-wrapper { width: 100%; justify-content: space-between; margin-top: 10px; }
            .hero h1 { font-size: 1.9rem; }
            .hero-stats { gap: 20px; }
            .news-item { flex-direction: column; align-items: flex-start; }
            .floating-cta { flex-direction: column; align-items: stretch; text-align: center; }
            .floating-cta .btn-gold { width: 100%; }
            .fab-custom { left: 15px; bottom: 90px; width: 48px; height: 48px; }
        }
        @media (max-width: 576px) {
            .hero-cta .btn { width: 100%; }
            .tool-metrics { grid-template-columns: 1fr 1fr; }
            .section-title { font-size: 1.6rem; }
            section { padding: 50px 0; }
            .footer-custom { padding: 40px 0 15px; }
        }

/* roulang page: article */
:root {
            --bg-primary: #121212;
            --bg-secondary: #1C1C1E;
            --bg-card: #18181A;
            --accent-gold: #C5A059;
            --accent-amber: #FFBF00;
            --text-white: #F5F5F7;
            --text-muted: #D4AC0D;
            --text-soft: #A8A29E;
            --border-gold: rgba(197, 160, 89, 0.35);
            --shadow-gold: 0 8px 30px rgba(197, 160, 89, 0.12);
            --radius-lg: 18px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition: all 0.25s ease;
        }

        html { scroll-behavior: smooth; }

        body {
            font-family: 'Be Vietnam Pro', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a { text-decoration: none; color: inherit; transition: var(--transition); }
        img { max-width: 100%; display: block; }

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

        /* Header/Navbar */
        .navbar-custom {
            background: rgba(18, 18, 18, 0.97);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-gold);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 1030;
        }

        .navbar-custom .navbar-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--accent-gold);
            letter-spacing: -0.5px;
        }

        .navbar-custom .navbar-brand span { color: var(--text-white); }

        .navbar-custom .nav-link {
            color: var(--text-soft);
            font-weight: 500;
            font-size: 0.95rem;
            margin: 0 8px;
            padding: 8px 12px;
            border-radius: 8px;
            transition: var(--transition);
        }

        .navbar-custom .nav-link:hover,
        .navbar-custom .nav-link.active {
            color: var(--accent-amber);
            background: rgba(255, 191, 0, 0.08);
        }

        .navbar-custom .btn-login {
            color: var(--text-white);
            border: 1px solid rgba(255, 255, 255, 0.3);
            background: transparent;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 8px;
            margin-right: 6px;
            transition: var(--transition);
        }

        .navbar-custom .btn-login:hover {
            border-color: var(--accent-gold);
            color: var(--accent-amber);
        }

        .navbar-custom .btn-signup {
            background: linear-gradient(135deg, var(--accent-amber), var(--accent-gold));
            color: #121212;
            font-weight: 700;
            padding: 8px 20px;
            border-radius: 8px;
            border: none;
            transition: var(--transition);
        }

        .navbar-custom .btn-signup:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(197, 160, 89, 0.4);
        }

        .navbar-custom .navbar-toggler {
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
        }

        .navbar-custom .navbar-toggler:focus { box-shadow: none; }

        .navbar-custom .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%23C5A059' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* Article Header */
        .article-header {
            position: relative;
            padding: 60px 0 50px;
            background: linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 60%, #121212 100%);
            overflow: hidden;
        }

        .article-header-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 1;
        }

        .article-header .container-custom {
            position: relative;
            z-index: 2;
        }

        .breadcrumb-custom {
            background: transparent;
            margin-bottom: 20px;
        }

        .breadcrumb-custom .breadcrumb-item a {
            color: var(--text-soft);
            transition: var(--transition);
        }

        .breadcrumb-custom .breadcrumb-item a:hover {
            color: var(--accent-amber);
        }

        .breadcrumb-custom .breadcrumb-item.active {
            color: var(--accent-gold);
            font-weight: 500;
        }

        .breadcrumb-custom .breadcrumb-item + .breadcrumb-item::before {
            color: rgba(255, 255, 255, 0.4);
        }

        .article-title {
            font-size: clamp(1.8rem, 3.5vw, 2.8rem);
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 18px;
            color: #fff;
        }

        .article-meta {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            color: var(--text-soft);
            font-size: 0.95rem;
        }

        .article-meta i {
            color: var(--accent-gold);
            margin-right: 4px;
        }

        /* Article Content */
        .article-content-section {
            background-color: var(--bg-primary);
        }

        .article-body {
            font-size: 1.05rem;
            line-height: 1.7;
            color: #E2E2E2;
        }

        .article-body h2,
        .article-body h3,
        .article-body h4 {
            color: var(--text-white);
            font-weight: 700;
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            line-height: 1.4;
        }

        .article-body h2 {
            font-size: 1.75rem;
            border-left: 4px solid var(--accent-gold);
            padding-left: 16px;
        }

        .article-body h3 {
            font-size: 1.4rem;
        }

        .article-body p {
            margin-bottom: 1.2em;
        }

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

        .article-body a:hover {
            color: #fff;
        }

        .article-body ul,
        .article-body ol {
            margin: 1.2em 0;
            padding-left: 1.5em;
            color: #D1D1D1;
        }

        .article-body li {
            margin-bottom: 0.5em;
        }

        .article-body img {
            border-radius: 12px;
            margin: 1.5em 0;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
        }

        .article-body blockquote {
            border-left: 4px solid var(--accent-gold);
            background: rgba(197, 160, 89, 0.08);
            padding: 20px 24px;
            margin: 1.5em 0;
            border-radius: 0 12px 12px 0;
            color: var(--text-soft);
            font-style: italic;
        }

        .article-not-found h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

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

        /* Buttons */
        .btn-gold {
            display: inline-block;
            background: linear-gradient(135deg, #FFBF00, #C5A059);
            color: #121212;
            font-weight: 700;
            padding: 14px 30px;
            border-radius: 10px;
            border: none;
            box-shadow: 0 8px 25px rgba(255, 191, 0, 0.3);
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(255, 191, 0, 0.5);
            color: #121212;
        }

        .btn-outline-gold {
            display: inline-block;
            background: transparent;
            border: 1px solid var(--accent-gold);
            color: var(--accent-gold);
            font-weight: 600;
            padding: 14px 28px;
            border-radius: 10px;
            transition: var(--transition);
        }

        .btn-outline-gold:hover {
            background: rgba(197, 160, 89, 0.1);
            border-color: var(--accent-amber);
            color: var(--accent-amber);
        }

        /* CTA Box */
        .article-cta {
            background-color: var(--bg-primary);
        }

        .cta-box {
            background: linear-gradient(135deg, #1C1C1E, #18181A);
            border: 1px solid var(--border-gold);
            box-shadow: var(--shadow-gold);
        }

        .cta-title {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: #fff;
        }

        .cta-text {
            color: var(--text-soft);
            margin-bottom: 24px;
            font-size: 1.05rem;
        }

        /* FAQ */
        .faq-section {
            background-color: var(--bg-primary);
        }

        .section-heading h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }

        .section-heading p {
            color: var(--text-soft);
            font-size: 1rem;
        }

        .accordion-custom .accordion-item {
            background-color: var(--bg-card);
            border: 1px solid var(--border-gold);
            border-radius: 12px !important;
            margin-bottom: 12px;
            overflow: hidden;
        }

        .accordion-custom .accordion-header {
            margin: 0;
        }

        .accordion-custom .accordion-button {
            background-color: transparent;
            color: var(--text-white);
            font-weight: 600;
            padding: 18px 24px;
            font-size: 1rem;
            border-radius: 0;
            transition: var(--transition);
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            background-color: rgba(197, 160, 89, 0.08);
            color: var(--accent-amber);
            box-shadow: none;
        }

        .accordion-custom .accordion-button:focus {
            box-shadow: none;
            border-color: transparent;
        }

        .accordion-custom .accordion-button::after {
            filter: invert(1);
        }

        .accordion-custom .accordion-body {
            padding: 18px 24px;
            color: var(--text-soft);
            line-height: 1.7;
            background-color: rgba(18, 18, 18, 0.6);
        }

        /* Footer */
        .footer-custom {
            background-color: #0D0D0D;
            border-top: 1px solid var(--border-gold);
            padding: 50px 0 20px;
            margin-top: 0;
        }

        .footer-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--accent-gold);
            margin-bottom: 14px;
        }

        .footer-brand span { color: var(--text-white); }

        .footer-text {
            color: var(--text-soft);
            line-height: 1.7;
            font-size: 0.95rem;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: var(--text-soft);
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: var(--accent-amber);
            padding-left: 4px;
        }

        .footer-bottom {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 991.98px) {
            .navbar-custom .navbar-collapse {
                background: rgba(18, 18, 18, 0.98);
                border-radius: 0 0 16px 16px;
                padding: 16px;
                margin-top: 10px;
                border: 1px solid var(--border-gold);
            }
            .navbar-custom .nav-link {
                margin: 4px 0;
                padding: 10px 12px;
            }
            .buttons-wrapper {
                margin-top: 12px;
                gap: 8px;
            }
            .btn-login, .btn-signup {
                display: inline-block;
                width: auto;
            }
            .article-header {
                padding: 40px 0 35px;
            }
            .article-title {
                font-size: 1.9rem;
            }
            .cta-title {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 575.98px) {
            .article-meta {
                flex-direction: column;
                gap: 8px;
            }
            .article-body {
                font-size: 1rem;
            }
            .cta-box {
                padding: 30px 20px !important;
            }
            .btn-gold, .btn-outline-gold {
                width: 100%;
                text-align: center;
                display: block;
                margin-bottom: 10px;
            }
            .btn-gold:last-child,
            .btn-outline-gold:last-child {
                margin-bottom: 0;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #121212;
            --bg-secondary: #1C1C1E;
            --bg-card: #18181A;
            --accent-gold: #C5A059;
            --accent-amber: #FFBF00;
            --text-white: #F5F5F7;
            --text-muted: #D4AC0D;
            --text-soft: #A8A29E;
            --border-gold: rgba(197, 160, 89, 0.35);
            --shadow-gold: 0 8px 30px rgba(197, 160, 89, 0.12);
            --radius-lg: 18px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition: all 0.25s ease;
        }
        
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Be Vietnam Pro', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        img { max-width: 100%; display: block; }
        
        /* Container */
        .container-custom { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Header/Navbar */
        .navbar-custom {
            background: rgba(18, 18, 18, 0.97);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-gold);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 1030;
        }
        .navbar-custom .navbar-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--accent-gold);
            letter-spacing: -0.5px;
        }
        .navbar-custom .navbar-brand span { color: var(--text-white); }
        .navbar-custom .nav-link {
            color: var(--text-soft);
            font-weight: 500;
            font-size: 0.95rem;
            margin: 0 8px;
            padding: 8px 12px;
            border-radius: 8px;
        }
        .navbar-custom .nav-link:hover,
        .navbar-custom .nav-link.active {
            color: var(--accent-amber);
            background: rgba(255, 191, 0, 0.08);
        }
        .navbar-custom .btn-login {
            color: var(--text-white);
            border: 1px solid rgba(255,255,255,0.3);
            background: transparent;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 8px;
            margin-right: 6px;
        }
        .navbar-custom .btn-login:hover {
            border-color: var(--accent-gold);
            color: var(--accent-amber);
        }
        .navbar-custom .btn-signup {
            background: linear-gradient(135deg, var(--accent-amber), var(--accent-gold));
            color: #121212;
            font-weight: 700;
            padding: 8px 20px;
            border-radius: 8px;
            border: none;
        }
        .navbar-custom .btn-signup:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(197,160,89,0.4);
        }
        .navbar-custom .navbar-toggler {
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
        }
        .navbar-custom .navbar-toggler:focus { box-shadow: none; }
        .navbar-custom .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%23C5A059' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }
        
        /* Hero Section */
        .hero {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 50%, #121212 100%);
            overflow: hidden;
            padding: 80px 0 60px;
        }
        .hero-bg {
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background-image: url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 1;
        }
        .hero .container-custom {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .hero-inner {
            display: grid;
            grid-template-columns: 1.05fr 0.95fr;
            gap: 50px;
            align-items: center;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(197,160,89,0.15);
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .hero h1 {
            font-size: clamp(2rem, 4vw, 3.2rem);
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 18px;
            color: #fff;
        }
        .hero h1 em { color: var(--accent-amber); font-style: normal; }
        .hero-lead {
            font-size: 1.1rem;
            color: var(--text-soft);
            max-width: 540px;
            margin-bottom: 30px;
            line-height: 1.7;
        }
        .hero-cta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 35px;
            align-items: center;
        }
        .btn-gold {
            background: linear-gradient(135deg, #FFBF00, #C5A059);
            color: #121212;
            font-weight: 700;
            padding: 14px 30px;
            border-radius: 10px;
            border: none;
            box-shadow: 0 8px 25px rgba(255,191,0,0.3);
            transition: var(--transition);
        }
        .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(255,191,0,0.5);
            color: #121212;
        }
        .btn-outline-gold {
            background: transparent;
            border: 1px solid var(--accent-gold);
            color: var(--accent-gold);
            font-weight: 600;
            padding: 14px 28px;
            border-radius: 10px;
            transition: var(--transition);
        }
        .btn-outline-gold:hover {
            background: rgba(197,160,89,0.1);
            border-color: var(--accent-amber);
            color: var(--accent-amber);
        }
        .play-btn-circle {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: rgba(0,0,0,0.65);
            border: 2px solid var(--accent-gold);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--accent-amber);
            transition: var(--transition);
            cursor: pointer;
            flex-shrink: 0;
        }
        .play-btn-circle:hover {
            background: var(--accent-gold);
            color: #121212;
            transform: scale(1.05);
            box-shadow: 0 0 25px rgba(255,191,0,0.5);
        }
        .hero-side-panel {
            background: rgba(24,24,26,0.92);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-lg);
            padding: 30px;
            box-shadow: var(--shadow-gold);
            backdrop-filter: blur(8px);
        }
        .hero-side-panel h2 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--accent-amber);
            margin-bottom: 20px;
        }
        .step-item {
            display: flex;
            gap: 15px;
            margin-bottom: 18px;
        }
        .step-num {
            flex: 0 0 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(197,160,89,0.15);
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
        }
        .step-content h3 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 3px;
            color: var(--text-white);
        }
        .step-content p {
            font-size: 0.85rem;
            color: var(--text-soft);
            margin-bottom: 0;
        }
        
        /* Section Common */
        .section-block {
            padding: 80px 0;
        }
        .section-heading {
            margin-bottom: 50px;
        }
        .section-heading h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .section-heading p {
            color: var(--text-soft);
            font-size: 1.05rem;
            max-width: 700px;
        }
        .text-accent { color: var(--accent-amber); }
        
        /* Value Prop - Asymmetric */
        .value-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
            align-items: center;
        }
        .value-visual {
            position: relative;
        }
        .value-visual img {
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-gold);
            box-shadow: var(--shadow-gold);
        }
        .value-visual::after {
            content: '';
            position: absolute;
            bottom: -20px;
            right: -20px;
            width: 100%;
            height: 100%;
            border: 1px dashed var(--border-gold);
            border-radius: var(--radius-lg);
            z-index: -1;
        }
        .value-list {
            list-style: none;
            padding: 0;
            margin: 20px 0 0;
        }
        .value-list li {
            display: flex;
            gap: 15px;
            margin-bottom: 18px;
            align-items: flex-start;
        }
        .value-list li i {
            color: var(--accent-amber);
            font-size: 1.2rem;
            margin-top: 4px;
            width: 24px;
            text-align: center;
        }
        .value-list li strong {
            display: block;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 3px;
        }
        .value-list li span {
            color: var(--text-soft);
            font-size: 0.9rem;
        }
        
        /* Features Section - Mixed Layout */
        .features-wrapper {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }
        .feature-card-main {
            grid-row: span 2;
            background: var(--bg-card);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-lg);
            padding: 40px 30px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            transition: var(--transition);
        }
        .feature-card-main:hover {
            box-shadow: var(--shadow-gold);
            transform: translateY(-5px);
        }
        .feature-card-main .feature-icon {
            font-size: 2.5rem;
            color: var(--accent-amber);
            margin-bottom: 20px;
        }
        .feature-card-main h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 15px;
        }
        .feature-card-main p {
            color: var(--text-soft);
        }
        .feature-card-sm {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: var(--radius-md);
            padding: 25px;
            transition: var(--transition);
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }
        .feature-card-sm:hover {
            border-color: var(--accent-gold);
            box-shadow: var(--shadow-gold);
        }
        .feature-card-sm .feature-icon {
            font-size: 1.8rem;
            color: var(--accent-gold);
            flex-shrink: 0;
        }
        .feature-card-sm h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .feature-card-sm p {
            color: var(--text-soft);
            font-size: 0.9rem;
            margin: 0;
        }
        
        /* Use Cases - Timeline */
        .use-case-flow {
            display: flex;
            flex-direction: column;
            gap: 25px;
            position: relative;
            padding-left: 30px;
        }
        .use-case-flow::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 5px;
            bottom: 5px;
            width: 2px;
            background: linear-gradient(to bottom, var(--accent-gold), rgba(197,160,89,0.1));
        }
        .use-case-item {
            position: relative;
            padding-left: 30px;
        }
        .use-case-item::before {
            content: '';
            position: absolute;
            left: -28px;
            top: 6px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--bg-card);
            border: 2px solid var(--accent-gold);
        }
        .use-case-item h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 5px;
            color: var(--accent-amber);
        }
        .use-case-item p {
            color: var(--text-soft);
            margin: 0;
        }
        
        /* Success Cases */
        .success-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }
        .success-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 25px;
            border-left: 3px solid var(--accent-gold);
            transition: var(--transition);
        }
        .success-card:hover {
            background: #1f1f21;
            transform: translateY(-3px);
            box-shadow: var(--shadow-gold);
        }
        .success-card .stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-amber);
            line-height: 1.2;
        }
        .success-card .stat-label {
            color: var(--text-soft);
            font-size: 0.9rem;
            margin-top: 8px;
        }
        .success-card .quote {
            color: var(--text-white);
            font-style: italic;
            margin-top: 15px;
            font-size: 0.95rem;
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 15px;
        }
        
        /* Pricing */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            align-items: stretch;
        }
        .pricing-card {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: var(--radius-lg);
            padding: 35px 30px;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }
        .pricing-card.featured {
            border-color: var(--accent-gold);
            box-shadow: var(--shadow-gold);
            position: relative;
            transform: scale(1.02);
        }
        .pricing-card .badge-featured {
            position: absolute;
            top: -12px;
            right: 20px;
            background: var(--accent-amber);
            color: #121212;
            font-weight: 700;
            font-size: 0.75rem;
            padding: 4px 12px;
            border-radius: 20px;
        }
        .pricing-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .pricing-card .price {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-amber);
            margin-bottom: 20px;
        }
        .pricing-card .price small {
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-soft);
        }
        .pricing-card ul {
            list-style: none;
            padding: 0;
            margin: 0 0 30px;
            flex-grow: 1;
        }
        .pricing-card ul li {
            padding: 8px 0;
            color: var(--text-soft);
            font-size: 0.95rem;
            border-bottom: 1px solid rgba(255,255,255,0.05);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .pricing-card ul li i {
            color: var(--accent-gold);
            font-size: 0.9rem;
        }
        
        /* FAQ */
        .accordion-custom .accordion-item {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: var(--radius-md) !important;
            margin-bottom: 15px;
            overflow: hidden;
        }
        .accordion-custom .accordion-button {
            background: transparent;
            color: var(--text-white);
            font-weight: 600;
            padding: 20px 25px;
            box-shadow: none;
        }
        .accordion-custom .accordion-button:not(.collapsed) {
            color: var(--accent-amber);
            background: rgba(197,160,89,0.05);
        }
        .accordion-custom .accordion-button:focus {
            box-shadow: none;
            border-color: var(--accent-gold);
        }
        .accordion-custom .accordion-button::after {
            filter: invert(70%) sepia(50%) saturate(200%);
        }
        .accordion-custom .accordion-body {
            color: var(--text-soft);
            padding: 15px 25px 25px;
            font-size: 0.95rem;
        }
        
        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #1a1a1a, #0d0d0d);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: left;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: 0; right: 0;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(255,191,0,0.1), transparent 70%);
            border-radius: 50%;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 15px;
            color: var(--text-white);
        }
        .cta-section p {
            color: var(--text-soft);
            max-width: 600px;
            margin-bottom: 30px;
        }
        
        /* Footer */
        .footer-custom {
            background: #0d0d0d;
            border-top: 1px solid var(--border-gold);
            padding: 60px 0 30px;
            margin-top: 80px;
        }
        .footer-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--accent-gold);
            margin-bottom: 15px;
        }
        .footer-brand span { color: var(--text-white); }
        .footer-text {
            color: var(--text-soft);
            font-size: 0.9rem;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: var(--text-soft);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-amber);
            padding-left: 5px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            margin-top: 40px;
            padding-top: 20px;
            text-align: center;
            color: var(--text-soft);
            font-size: 0.85rem;
        }
        
        /* FAB */
        .fab-support {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 1050;
            width: 56px;
            height: 56px;
            border-radius: 50px;
            background: rgba(0,0,0,0.6);
            backdrop-filter: blur(8px);
            border: 2px solid transparent;
            background-clip: padding-box;
            border-image: linear-gradient(135deg, #CCFF00, #0052FF) 1;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #00F0FF;
            font-size: 1.5rem;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 15px rgba(0,240,255,0.5);
            opacity: 0.6;
        }
        .fab-support:hover {
            opacity: 1;
            box-shadow: 0 0 25px rgba(0,240,255,0.8);
            transform: scale(1.1);
        }
        .fab-support .notification-dot {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #FF007F;
            animation: blink 1.2s infinite;
        }
        @keyframes blink {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.2; }
        }
        
        /* Responsive */
        @media (max-width: 991.98px) {
            .hero-inner, .value-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .features-wrapper {
                grid-template-columns: 1fr;
            }
            .success-grid, .pricing-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 767.98px) {
            .hero {
                min-height: auto;
                padding: 60px 0 40px;
            }
            .hero-cta {
                flex-direction: column;
                align-items: flex-start;
            }
            .success-grid, .pricing-grid {
                grid-template-columns: 1fr;
            }
            .cta-section {
                padding: 40px 25px;
            }
            .navbar-custom .btn-login, .navbar-custom .btn-signup {
                display: inline-block;
                margin: 4px 4px 4px 0;
            }
        }
        @media (max-width: 520px) {
            .container-custom {
                padding: 0 15px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero-side-panel {
                padding: 20px;
            }
            .fab-support {
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
                left: 0.75rem;
                bottom: 5rem;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #121212;
            --bg-secondary: #1C1C1E;
            --bg-card: #18181A;
            --accent-gold: #C5A059;
            --accent-amber: #FFBF00;
            --text-white: #F5F5F7;
            --text-muted: #D4AC0D;
            --text-soft: #A8A29E;
            --border-gold: rgba(197, 160, 89, 0.35);
            --shadow-gold: 0 8px 30px rgba(197, 160, 89, 0.12);
            --radius-lg: 18px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition: all 0.25s ease;
        }

        html { scroll-behavior: smooth; }
        body {
            font-family: 'Be Vietnam Pro', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        img { max-width: 100%; display: block; }

        /* Container */
        .container-custom { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* Header/Navbar */
        .navbar-custom {
            background: rgba(18, 18, 18, 0.97);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-gold);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 1030;
        }
        .navbar-custom .navbar-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--accent-gold);
            letter-spacing: -0.5px;
        }
        .navbar-custom .navbar-brand span { color: var(--text-white); }
        .navbar-custom .nav-link {
            color: var(--text-soft);
            font-weight: 500;
            font-size: 0.95rem;
            margin: 0 8px;
            padding: 8px 12px;
            border-radius: 8px;
        }
        .navbar-custom .nav-link:hover,
        .navbar-custom .nav-link.active {
            color: var(--accent-amber);
            background: rgba(255, 191, 0, 0.08);
        }
        .navbar-custom .btn-login {
            color: var(--text-white);
            border: 1px solid rgba(255,255,255,0.3);
            background: transparent;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 8px;
            margin-right: 6px;
            transition: var(--transition);
        }
        .navbar-custom .btn-login:hover {
            border-color: var(--accent-gold);
            color: var(--accent-amber);
        }
        .navbar-custom .btn-signup {
            background: linear-gradient(135deg, var(--accent-amber), var(--accent-gold));
            color: #121212;
            font-weight: 700;
            padding: 8px 20px;
            border-radius: 8px;
            border: none;
            transition: var(--transition);
        }
        .navbar-custom .btn-signup:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(197,160,89,0.4);
        }
        .navbar-custom .navbar-toggler {
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
        }
        .navbar-custom .navbar-toggler:focus { box-shadow: none; }
        .navbar-custom .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%23C5A059' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* Hero */
        .hero-category {
            position: relative;
            min-height: 620px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0b0b0b 0%, #1a1610 50%, #0d0d0d 100%);
            overflow: hidden;
        }
        .hero-category .hero-bg {
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background-image: url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            opacity: 0.22;
            z-index: 1;
        }
        .hero-category .container-custom {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .hero-category-grid {
            display: grid;
            grid-template-columns: 1.05fr 0.95fr;
            gap: 48px;
            align-items: center;
        }
        .hero-category .hero-badge {
            display: inline-block;
            background: rgba(197,160,89,0.18);
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 18px;
        }
        .hero-category h1 {
            font-size: clamp(2rem, 4vw, 3.3rem);
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 20px;
            color: #fff;
        }
        .hero-category h1 em { color: var(--accent-amber); font-style: normal; }
        .hero-category .hero-lead {
            font-size: 1.1rem;
            color: var(--text-soft);
            max-width: 580px;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .countdown-bar {
            background: rgba(0,0,0,0.55);
            border: 1px solid var(--border-gold);
            border-radius: 10px;
            padding: 14px 20px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            margin-bottom: 24px;
            max-width: 540px;
        }
        .countdown-bar .label {
            font-size: 0.9rem;
            color: var(--text-soft);
            font-weight: 600;
        }
        .countdown-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            min-width: 50px;
        }
        .countdown-item .number {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--accent-amber);
            line-height: 1.1;
        }
        .countdown-item .unit {
            font-size: 0.7rem;
            color: var(--text-soft);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .hero-cta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 35px;
        }
        .btn-gold {
            background: linear-gradient(135deg, #FFBF00, #C5A059);
            color: #121212;
            font-weight: 700;
            padding: 14px 30px;
            border-radius: 10px;
            border: none;
            box-shadow: 0 8px 25px rgba(255,191,0,0.3);
            transition: var(--transition);
        }
        .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(255,191,0,0.5);
            color: #121212;
        }
        .btn-outline-gold {
            background: transparent;
            border: 1px solid var(--accent-gold);
            color: var(--accent-gold);
            font-weight: 600;
            padding: 14px 28px;
            border-radius: 10px;
            transition: var(--transition);
        }
        .btn-outline-gold:hover {
            background: rgba(197,160,89,0.1);
            border-color: var(--accent-amber);
            color: var(--accent-amber);
        }
        .hero-image-panel {
            background: rgba(0,0,0,0.5);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-gold);
            overflow: hidden;
            box-shadow: var(--shadow-gold);
        }
        .hero-image-panel img {
            width: 100%;
            height: 360px;
            object-fit: cover;
        }
        .hero-image-panel .panel-caption {
            padding: 16px 18px;
            font-size: 0.9rem;
            color: var(--text-soft);
            border-top: 1px solid var(--border-gold);
        }

        /* General section styling */
        .section {
            padding: 70px 0;
        }
        .section-header {
            margin-bottom: 40px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .section-header h2 em {
            color: var(--accent-amber);
            font-style: normal;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-soft);
            max-width: 680px;
            line-height: 1.7;
        }

        /* Feature group */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
            padding: 26px 22px;
            transition: var(--transition);
        }
        .feature-card:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-4px);
        }
        .feature-icon {
            width: 52px;
            height: 52px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(197,160,89,0.15);
            border-radius: 12px;
            color: var(--accent-amber);
            font-size: 1.4rem;
            margin-bottom: 18px;
        }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-soft);
            margin-bottom: 0;
        }

        /* Use case list */
        .usecase-block {
            background: var(--bg-secondary);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(255,255,255,0.05);
        }
        .usecase-row {
            display: flex;
            align-items: center;
            padding: 22px 28px;
            border-bottom: 1px solid rgba(255,255,255,0.05);
        }
        .usecase-row:last-child { border-bottom: none; }
        .usecase-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-gold);
            width: 60px;
            flex-shrink: 0;
        }
        .usecase-info h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 6px;
        }
        .usecase-info p {
            font-size: 0.95rem;
            color: var(--text-soft);
            margin-bottom: 0;
        }
        .usecase-icon {
            margin-left: auto;
            font-size: 1.6rem;
            color: var(--accent-amber);
            opacity: 0.8;
        }

        /* Testimonial / evidence */
        .evidence-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .evidence-item {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: left;
        }
        .evidence-item .quote {
            font-size: 0.95rem;
            color: var(--text-soft);
            font-style: italic;
            margin-bottom: 16px;
            line-height: 1.7;
        }
        .evidence-item .author {
            font-weight: 700;
            color: var(--accent-gold);
            font-size: 0.9rem;
        }
        .evidence-stat {
            display: flex;
            align-items: center;
            gap: 20px;
            margin-top: 20px;
            padding: 16px 20px;
            background: rgba(197,160,89,0.08);
            border-radius: 10px;
        }
        .evidence-stat .value {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--accent-amber);
        }
        .evidence-stat .label {
            font-size: 0.9rem;
            color: var(--text-soft);
        }

        /* Pricing */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 26px;
        }
        .pricing-card {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
            position: relative;
        }
        .pricing-card:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-6px);
        }
        .pricing-card.premium {
            border-color: var(--accent-gold);
            background: linear-gradient(145deg, #1c1a17, #18181A);
        }
        .pricing-card .price-tag {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-amber);
            margin-bottom: 6px;
        }
        .pricing-card .price-unit {
            font-size: 0.9rem;
            color: var(--text-soft);
        }
        .pricing-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .pricing-card ul {
            list-style: none;
            padding: 0;
            margin: 0 0 24px;
        }
        .pricing-card ul li {
            padding: 8px 0;
            font-size: 0.95rem;
            color: var(--text-soft);
            border-bottom: 1px solid rgba(255,255,255,0.04);
        }
        .pricing-card ul li i {
            color: var(--accent-gold);
            margin-right: 8px;
        }

        /* FAQ */
        .faq-item {
            background: var(--bg-card);
            border: 1px solid rgba(255,255,255,0.06);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            overflow: hidden;
        }
        .faq-question {
            padding: 20px 24px;
            font-weight: 700;
            color: #fff;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 1rem;
        }
        .faq-question i {
            color: var(--accent-gold);
            transition: transform 0.3s;
        }
        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-soft);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }

        /* CTA section */
        .cta-section {
            background: var(--bg-secondary);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            margin: 60px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            top: -40%;
            right: -10%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(197,160,89,0.1), transparent 70%);
            border-radius: 50%;
        }
        .cta-section h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: var(--text-soft);
            font-size: 1rem;
            margin-bottom: 24px;
            max-width: 600px;
        }

        /* Footer */
        .footer-custom {
            background: #0b0b0b;
            border-top: 1px solid var(--border-gold);
            padding: 60px 0 30px;
            margin-top: 60px;
        }
        .footer-brand {
            font-weight: 800;
            font-size: 1.4rem;
            color: var(--accent-gold);
            margin-bottom: 16px;
        }
        .footer-brand span { color: var(--text-white); }
        .footer-text {
            color: var(--text-soft);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li { margin-bottom: 10px; }
        .footer-links a {
            color: var(--text-soft);
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-amber);
            padding-left: 6px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            margin-top: 40px;
            padding-top: 24px;
            text-align: center;
            color: var(--text-soft);
            font-size: 0.85rem;
        }

        /* FAB */
        .fab-left-bottom {
            position: fixed;
            left: 16px;
            bottom: 24px;
            z-index: 1050;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(18,18,18,0.85);
            backdrop-filter: blur(8px);
            border: 2px solid var(--accent-gold);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-amber);
            font-size: 1.3rem;
            cursor: pointer;
            transition: var(--transition);
            opacity: 0.7;
            animation: float-pulse 3s infinite;
        }
        .fab-left-bottom:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 15px rgba(197,160,89,0.5);
        }
        @keyframes float-pulse {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-4px); }
        }

        /* Responsive */
        @media (max-width: 992px) {
            .hero-category-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero-image-panel img { height: 260px; }
            .feature-grid, .evidence-grid, .pricing-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .section { padding: 50px 0; }
            .hero-category { min-height: auto; padding: 60px 0; }
            .feature-grid, .evidence-grid, .pricing-grid {
                grid-template-columns: 1fr;
            }
            .usecase-row { flex-wrap: wrap; }
            .usecase-icon { margin-left: 0; margin-top: 12px; }
        }
        @media (max-width: 520px) {
            .navbar-custom .navbar-brand { font-size: 1.2rem; }
            .hero-category h1 { font-size: 1.8rem; }
            .countdown-bar { gap: 10px; }
            .hero-cta .btn { width: 100%; }
            .cta-section { padding: 32px 24px; }
        }