/* roulang page: index */
:root {
            --bg-deep: #08090F;
            --bg-navy: #0D111E;
            --bg-card: #111827;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #7C8BA1;
            --border-subtle: rgba(0, 240, 255, 0.18);
            --border-strong: rgba(0, 240, 255, 0.55);
            --shadow-cyan: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-blue: 0 12px 35px rgba(0, 82, 255, 0.25);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --space-section: 5.5rem;
            --transition: all 0.25s ease;
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            background-color: var(--bg-deep);
            color: var(--text-white);
            font-family: var(--font-family);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        img { max-width: 100%; display: block; }
        button { font-family: inherit; }
        .container-custom { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
        @media (max-width: 768px) {
            .container-custom { padding: 0 1rem; }
        }
        /* Navigation */
        .navbar-custom {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1050;
            background: rgba(8, 9, 15, 0.9);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.12);
            padding: 0.75rem 0;
        }
        .navbar-custom .navbar-brand-custom {
            font-weight: 800;
            font-size: 1.2rem;
            letter-spacing: -0.01em;
            color: var(--text-white);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .navbar-custom .navbar-brand-custom .brand-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #fff;
        }
        .navbar-custom .nav-link-custom {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-silver);
            padding: 0.5rem 1rem;
            border-radius: 50px;
            transition: var(--transition);
        }
        .navbar-custom .nav-link-custom:hover,
        .navbar-custom .nav-link-custom:focus {
            color: var(--text-white);
            background: rgba(0, 240, 255, 0.08);
        }
        .navbar-custom .nav-link-custom.active {
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.12);
            font-weight: 600;
        }
        .navbar-custom .btn-login {
            color: var(--text-white);
            font-weight: 600;
            padding: 0.5rem 1rem;
            background: transparent;
            border: none;
            border-radius: 50px;
            transition: var(--transition);
        }
        .navbar-custom .btn-login:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .navbar-custom .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            font-weight: 700;
            padding: 0.5rem 1.2rem;
            border-radius: 50px;
            border: none;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.35);
        }
        .navbar-custom .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 82, 255, 0.5);
        }
        @media (max-width: 991.98px) {
            .navbar-custom .navbar-collapse-custom {
                background: rgba(8, 9, 15, 0.98);
                border-radius: var(--radius-md);
                padding: 1rem;
                margin-top: 0.75rem;
                border: 1px solid rgba(0, 240, 255, 0.15);
            }
        }
        /* Hero */
        .hero-section {
            position: relative;
            padding: 9rem 0 5rem;
            background: radial-gradient(ellipse at 30% 20%, rgba(0, 82, 255, 0.2), transparent 60%), radial-gradient(ellipse at 80% 10%, rgba(0, 240, 255, 0.12), transparent 55%), var(--bg-navy);
            overflow: hidden;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.08), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(0, 240, 255, 0.12);
            border: 1px solid rgba(0, 240, 255, 0.25);
            color: var(--accent-cyan);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 0.4rem 1rem;
            border-radius: 50px;
            margin-bottom: 1.5rem;
        }
        .hero-title {
            font-size: 3.25rem;
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: -0.02em;
            color: var(--text-white);
            margin-bottom: 1.25rem;
        }
        .hero-title .text-gradient {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-silver);
            max-width: 620px;
            line-height: 1.7;
            margin-bottom: 2rem;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2rem; }
        .btn-primary-cyan {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            font-weight: 700;
            padding: 0.8rem 1.8rem;
            border-radius: 50px;
            border: none;
            box-shadow: var(--shadow-blue);
            transition: var(--transition);
        }
        .btn-primary-cyan:hover {
            transform: translateY(-2px);
            box-shadow: 0 16px 40px rgba(0, 82, 255, 0.45);
            color: #fff;
        }
        .btn-outline-cyan {
            background: transparent;
            border: 1.5px solid rgba(0, 240, 255, 0.5);
            color: var(--accent-cyan);
            font-weight: 600;
            padding: 0.8rem 1.8rem;
            border-radius: 50px;
            transition: var(--transition);
        }
        .btn-outline-cyan:hover {
            background: rgba(0, 240, 255, 0.1);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }
        .hero-stats { display: flex; flex-wrap: wrap; gap: 2rem; }
        .hero-stat { text-align: left; }
        .hero-stat .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-cyan);
            line-height: 1.2;
        }
        .hero-stat .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 400px;
        }
        .hero-visual .main-backpic {
            width: 100%;
            max-width: 520px;
            border-radius: var(--radius-lg);
            border: 1px solid rgba(0, 240, 255, 0.25);
            box-shadow: var(--shadow-cyan);
            object-fit: cover;
            aspect-ratio: 4/3;
        }
        .hero-visual .floating-chip {
            position: absolute;
            background: rgba(8, 9, 15, 0.85);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(0, 240, 255, 0.3);
            border-radius: var(--radius-md);
            padding: 0.75rem 1rem;
            font-weight: 600;
            font-size: 0.85rem;
            box-shadow: 0 8px 25px rgba(0,0,0,0.5);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .floating-chip.chip-1 { top: 10%; left: -10px; }
        .floating-chip.chip-2 { bottom: 12%; right: -5px; }
        .floating-chip i { color: var(--accent-cyan); }
        @media (max-width: 991.98px) {
            .hero-section { padding: 7rem 0 3.5rem; }
            .hero-title { font-size: 2.5rem; }
            .hero-visual { min-height: 300px; margin-top: 2rem; }
        }
        @media (max-width: 575.98px) {
            .hero-title { font-size: 2rem; }
            .hero-desc { font-size: 1rem; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; }
            .hero-stats { gap: 1.5rem; }
        }
        /* Section Titles */
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            margin-bottom: 1rem;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.01em;
            margin-bottom: 1rem;
            color: var(--text-white);
        }
        .section-desc {
            color: var(--text-silver);
            font-size: 1.05rem;
            max-width: 700px;
            line-height: 1.7;
        }
        /* Category Entry Cards */
        .category-section {
            background: var(--bg-navy);
            padding: var(--space-section) 0;
        }
        .category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
        .category-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            border-color: var(--border-strong);
            box-shadow: 0 10px 30px rgba(0, 240, 255, 0.15);
            transform: translateY(-5px);
        }
        .category-card .card-cover {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            border-bottom: 1px solid var(--border-subtle);
        }
        .category-card .card-body-custom {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .card-tag {
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.1);
            padding: 0.25rem 0.75rem;
            border-radius: 50px;
            align-self: flex-start;
            margin-bottom: 0.75rem;
        }
        .category-card h3 { font-size: 1.35rem; font-weight: 700; margin-bottom: 0.5rem; }
        .category-card p { color: var(--text-silver); font-size: 0.95rem; flex: 1; margin-bottom: 1rem; }
        .category-card .card-link {
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
        }
        .category-card .card-link:hover { gap: 0.6rem; }
        @media (max-width: 991.98px) {
            .category-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 575.98px) {
            .category-grid { grid-template-columns: 1fr; }
        }
        /* Resource List */
        .resource-section {
            background: var(--bg-deep);
            padding: var(--space-section) 0;
        }
        .resource-list { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 2rem; }
        .resource-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 1rem 1.5rem;
            transition: var(--transition);
        }
        .resource-item:hover {
            border-color: var(--border-strong);
            background: #131a2b;
        }
        .resource-item .resource-left { display: flex; align-items: center; gap: 1rem; }
        .resource-item .resource-icon {
            width: 44px;
            height: 44px;
            background: rgba(0, 240, 255, 0.1);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .resource-item .resource-title { font-weight: 700; font-size: 1rem; color: var(--text-white); }
        .resource-item .resource-sub { font-size: 0.85rem; color: var(--text-muted); }
        .resource-item .resource-action {
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.9rem;
            white-space: nowrap;
        }
        @media (max-width: 575.98px) {
            .resource-item { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
        }
        /* Info / News Section */
        .info-section {
            background: var(--bg-navy);
            padding: var(--space-section) 0;
        }
        .info-layout { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 2.5rem; margin-top: 2rem; }
        .info-list { display: flex; flex-direction: column; gap: 1rem; }
        .info-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 1.25rem 1.5rem;
            transition: var(--transition);
        }
        .info-item:hover { border-color: var(--border-strong); }
        .info-item .info-title {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-white);
            margin-bottom: 0.35rem;
        }
        .info-item .info-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            gap: 1rem;
        }
        .info-sidebar {
            background: rgba(0, 82, 255, 0.08);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 1.75rem;
            height: fit-content;
        }
        .info-sidebar h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .info-sidebar ul { list-style: none; padding: 0; margin: 0; }
        .info-sidebar ul li {
            padding: 0.6rem 0;
            border-bottom: 1px solid rgba(255,255,255,0.05);
            color: var(--text-silver);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .info-sidebar ul li:last-child { border-bottom: none; }
        .info-sidebar ul li i { color: var(--accent-cyan); font-size: 0.7rem; }
        @media (max-width: 991.98px) {
            .info-layout { grid-template-columns: 1fr; }
        }
        /* Download CTA */
        .download-section {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.15), rgba(0, 240, 255, 0.08)), var(--bg-deep);
            padding: var(--space-section) 0;
        }
        .download-panel {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 3rem;
            text-align: left;
            position: relative;
            overflow: hidden;
        }
        .download-panel::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.12), transparent 70%);
            border-radius: 50%;
        }
        .download-panel h3 {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 1rem;
            position: relative;
            z-index: 1;
        }
        .download-panel p {
            color: var(--text-silver);
            font-size: 1.05rem;
            max-width: 600px;
            position: relative;
            z-index: 1;
        }
        .download-buttons { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 1.5rem; position: relative; z-index: 1; }
        .btn-download {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--text-white);
            font-weight: 600;
            padding: 0.7rem 1.4rem;
            border-radius: 50px;
            transition: var(--transition);
        }
        .btn-download:hover {
            background: rgba(0, 240, 255, 0.15);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }
        @media (max-width: 575.98px) {
            .download-panel { padding: 2rem 1.5rem; }
        }
        /* Trust / Security */
        .trust-section {
            background: var(--bg-navy);
            padding: var(--space-section) 0;
        }
        .trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 2rem; }
        .trust-item {
            background: transparent;
            border-left: 2px solid var(--accent-cyan);
            padding: 0 1.25rem;
        }
        .trust-item .trust-icon {
            font-size: 1.8rem;
            color: var(--accent-cyan);
            margin-bottom: 0.75rem;
        }
        .trust-item h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
        .trust-item p { color: var(--text-silver); font-size: 0.9rem; margin: 0; }
        @media (max-width: 991.98px) {
            .trust-grid { grid-template-columns: 1fr; }
        }
        /* FAQ */
        .faq-section {
            background: var(--bg-deep);
            padding: var(--space-section) 0;
        }
        .faq-list { margin-top: 2rem; max-width: 820px; }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 1.25rem 1.5rem;
            margin-bottom: 0.75rem;
        }
        .faq-item .faq-question {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-white);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-item .faq-question i { color: var(--accent-cyan); transition: var(--transition); }
        .faq-item .faq-answer {
            color: var(--text-silver);
            font-size: 0.95rem;
            margin-top: 0.75rem;
            line-height: 1.7;
        }
        /* Footer */
        .footer-custom {
            background: #05060A;
            border-top: 1px solid rgba(0, 240, 255, 0.12);
            padding: 3rem 0 1.5rem;
        }
        .footer-custom .footer-brand {
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--text-white);
            margin-bottom: 1rem;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .footer-custom p { color: var(--text-muted); font-size: 0.9rem; max-width: 400px; }
        .footer-custom .footer-title {
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 1rem;
            font-size: 0.95rem;
        }
        .footer-custom .footer-links { list-style: none; padding: 0; margin: 0; }
        .footer-custom .footer-links li { margin-bottom: 0.5rem; }
        .footer-custom .footer-links a {
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-custom .footer-links a:hover { color: var(--accent-cyan); }
        .footer-custom .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 1.5rem;
            margin-top: 2rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            color: var(--text-muted);
            font-size: 0.8rem;
        }
        /* FAB */
        .fab-cyber {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 1060;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.6);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(8,9,15,0.6), rgba(8,9,15,0.6)), linear-gradient(135deg, #CCFF00, #00F0FF);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.3rem;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            opacity: 0.6;
            transition: var(--transition);
            cursor: pointer;
        }
        .fab-cyber:hover {
            opacity: 1;
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.8);
            transform: scale(1.1);
        }
        .fab-cyber:active {
            transform: scale(0.95);
            color: #FF007F;
        }
        /* Mobile Nav Toggler */
        .navbar-toggler-custom {
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.08);
            border-radius: 8px;
            padding: 0.35rem 0.7rem;
            font-size: 1.2rem;
        }
        @media (min-width: 992px) {
            .navbar-toggler-custom { display: none; }
        }
        @media (max-width: 991.98px) {
            .navbar-custom .navbar-collapse-custom { display: none; }
            .navbar-custom .navbar-collapse-custom.show { display: block; }
        }

/* roulang page: article */
:root {
            --bg-primary: #0F0C20;
            --bg-secondary: #0B1A30;
            --bg-card: #151230;
            --bg-card-hover: #1C1838;
            --accent-lime: #CCFF00;
            --accent-cyan: #00F0FF;
            --accent-hot-pink: #FF007F;
            --text-primary: #FFFFFF;
            --text-secondary: #A6ACAF;
            --text-muted: #6B7280;
            --border-neon: rgba(0, 240, 255, 0.25);
            --border-lime: rgba(204, 255, 0, 0.3);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-neon: 0 0 20px rgba(0, 240, 255, 0.15);
            --shadow-neon-strong: 0 0 35px rgba(0, 240, 255, 0.35);
            --shadow-lime: 0 0 18px rgba(204, 255, 0, 0.18);
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-primary: 'Be Vietnam Pro', sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-primary);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            background-image: 
                radial-gradient(ellipse at 20% 10%, rgba(0, 240, 255, 0.04) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 30%, rgba(204, 255, 0, 0.03) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 80%, rgba(255, 0, 127, 0.02) 0%, transparent 50%);
            background-attachment: fixed;
        }

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

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

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

        .container-custom {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* Navbar */
        .navbar-custom {
            background: rgba(15, 12, 32, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.12);
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 1050;
            transition: background var(--transition-smooth);
        }

        .navbar-custom.scrolled {
            background: rgba(15, 12, 32, 0.98);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
        }

        .navbar-brand-custom {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--text-primary) !important;
            letter-spacing: -0.5px;
        }

        .navbar-brand-custom .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-lime));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #0F0C20;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
        }

        .nav-link-custom {
            color: var(--text-secondary) !important;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 16px !important;
            border-radius: 50px;
            transition: all var(--transition-fast);
            position: relative;
        }

        .nav-link-custom:hover,
        .nav-link-custom.active {
            color: var(--accent-cyan) !important;
            background: rgba(0, 240, 255, 0.08);
        }

        .nav-link-custom.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
            box-shadow: 0 0 10px var(--accent-cyan);
        }

        .navbar-toggler-custom {
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid rgba(0, 240, 255, 0.3);
            color: var(--accent-cyan);
            width: 44px;
            height: 44px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .navbar-toggler-custom:hover {
            background: rgba(0, 240, 255, 0.2);
            box-shadow: var(--shadow-neon);
        }

        .btn-login {
            background: transparent;
            border: 1px solid rgba(0, 240, 255, 0.4);
            color: var(--accent-cyan);
            padding: 10px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .btn-login:hover {
            background: rgba(0, 240, 255, 0.1);
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-neon);
            color: var(--accent-cyan);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-lime));
            border: none;
            color: #0F0C20;
            padding: 10px 26px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
            box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
        }

        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 240, 255, 0.45);
            color: #0F0C20;
        }

        .navbar-collapse-custom {
            display: none;
        }

        .navbar-collapse-custom.show {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
        }

        @media (min-width: 992px) {
            .navbar-collapse-custom {
                display: flex !important;
                flex-direction: row;
                align-items: center;
            }
            .navbar-toggler-custom {
                display: none;
            }
        }

        /* Article Hero */
        .article-hero {
            position: relative;
            padding: 60px 0 50px;
            background: 
                linear-gradient(180deg, rgba(15, 12, 32, 0.85) 0%, rgba(15, 12, 32, 0.95) 100%),
                url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            border-bottom: 1px solid rgba(0, 240, 255, 0.1);
        }

        .article-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 240, 255, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }

        .article-badge-row {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            margin-bottom: 18px;
            position: relative;
            z-index: 2;
        }

        .badge-category {
            background: rgba(0, 240, 255, 0.12);
            color: var(--accent-cyan);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            border: 1px solid rgba(0, 240, 255, 0.3);
            letter-spacing: 0.3px;
        }

        .badge-date {
            color: var(--text-secondary);
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 900;
            line-height: 1.25;
            letter-spacing: -1px;
            margin-bottom: 20px;
            position: relative;
            z-index: 2;
            color: var(--text-primary);
        }

        .article-excerpt {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 800px;
            line-height: 1.7;
            position: relative;
            z-index: 2;
            border-left: 3px solid var(--accent-cyan);
            padding-left: 20px;
            margin-top: 16px;
        }

        /* Article Body */
        .article-main {
            padding: 50px 0 70px;
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
        }

        @media (min-width: 992px) {
            .article-layout {
                grid-template-columns: 1fr 300px;
                gap: 50px;
            }
        }

        .article-content {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px;
            border: 1px solid rgba(0, 240, 255, 0.1);
            position: relative;
            overflow: hidden;
        }

        .article-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-lime), var(--accent-hot-pink));
        }

        .article-content h2 {
            font-size: 1.7rem;
            font-weight: 800;
            margin-top: 35px;
            margin-bottom: 18px;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            line-height: 1.35;
        }

        .article-content h2:first-child {
            margin-top: 0;
        }

        .article-content h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-top: 28px;
            margin-bottom: 14px;
            color: var(--accent-lime);
            letter-spacing: -0.3px;
        }

        .article-content p {
            color: var(--text-secondary);
            margin-bottom: 18px;
            line-height: 1.75;
            font-size: 1rem;
        }

        .article-content ul,
        .article-content ol {
            color: var(--text-secondary);
            margin-bottom: 20px;
            padding-left: 24px;
        }

        .article-content li {
            margin-bottom: 10px;
            line-height: 1.7;
        }

        .article-content img {
            border-radius: var(--radius-md);
            margin: 20px 0;
            border: 1px solid rgba(0, 240, 255, 0.15);
        }

        .article-content blockquote {
            background: rgba(0, 240, 255, 0.05);
            border-left: 4px solid var(--accent-cyan);
            padding: 20px 24px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 24px 0;
            color: var(--text-primary);
            font-style: italic;
            font-size: 1.05rem;
        }

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

        .article-not-found {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-secondary);
        }

        .article-not-found .icon-large {
            font-size: 3rem;
            color: var(--accent-cyan);
            margin-bottom: 20px;
            opacity: 0.6;
        }

        .article-not-found h2 {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .btn-back-home {
            display: inline-block;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-lime));
            color: #0F0C20;
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.95rem;
            margin-top: 20px;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
        }

        .btn-back-home:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 240, 255, 0.45);
            color: #0F0C20;
        }

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

        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 26px;
            border: 1px solid rgba(0, 240, 255, 0.1);
        }

        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 18px;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

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

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

        .sidebar-links li {
            margin-bottom: 12px;
        }

        .sidebar-links a {
            color: var(--text-secondary);
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sidebar-links a:hover {
            color: var(--accent-lime);
            transform: translateX(4px);
        }

        .sidebar-cta {
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(204, 255, 0, 0.08));
            border: 1px solid rgba(0, 240, 255, 0.25);
            border-radius: var(--radius-lg);
            padding: 28px;
            text-align: center;
        }

        .sidebar-cta h3 {
            font-size: 1.3rem;
            font-weight: 800;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .sidebar-cta p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 20px;
        }

        /* CTA Section */
        .cta-section {
            padding: 70px 0;
            background: linear-gradient(180deg, transparent, rgba(0, 240, 255, 0.05));
            border-top: 1px solid rgba(0, 240, 255, 0.1);
        }

        .cta-box {
            background: linear-gradient(135deg, rgba(15, 12, 32, 0.9), rgba(11, 26, 48, 0.95));
            border: 1px solid rgba(0, 240, 255, 0.25);
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-box::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.1) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-box h2 {
            font-size: 2rem;
            font-weight: 900;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
            position: relative;
        }

        .cta-box p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            margin-bottom: 28px;
            position: relative;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn-cta-primary {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-lime));
            color: #0F0C20;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 800;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
            box-shadow: 0 6px 25px rgba(0, 240, 255, 0.35);
            display: inline-block;
            position: relative;
        }

        .btn-cta-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 35px rgba(0, 240, 255, 0.5);
            color: #0F0C20;
        }

        /* Footer */
        .footer-custom {
            background: rgba(11, 26, 48, 0.7);
            border-top: 1px solid rgba(0, 240, 255, 0.12);
            padding: 60px 0 30px;
            margin-top: 0;
        }

        .footer-brand {
            font-size: 1.2rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-primary);
            display: flex;
            align-items: center;
        }

        .footer-brand i {
            color: var(--accent-cyan);
        }

        .footer-custom p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        .footer-title {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--accent-lime);
            letter-spacing: 0.3px;
        }

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

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

        .footer-links a {
            color: var(--text-secondary);
            font-size: 0.9rem;
            transition: all var(--transition-fast);
        }

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

        .footer-bottom {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid rgba(0, 240, 255, 0.08);
            display: flex;
            flex-direction: column;
            gap: 8px;
            color: var(--text-muted);
            font-size: 0.82rem;
        }

        @media (min-width: 768px) {
            .footer-bottom {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
            }
        }

        /* FAB */
        .fab-neon {
            position: fixed;
            left: 24px;
            bottom: 96px;
            z-index: 1050;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all var(--transition-smooth);
            opacity: 0.6;
            position: fixed;
        }

        .fab-neon::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-lime), var(--accent-cyan), var(--accent-hot-pink));
            z-index: -1;
            animation: fab-glow 3s ease-in-out infinite;
        }

        @keyframes fab-glow {
            0%, 100% {
                box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            }
            50% {
                box-shadow: 0 0 30px rgba(204, 255, 0, 0.7);
            }
        }

        .fab-neon:hover {
            opacity: 1;
            transform: scale(1.1);
        }

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

        .fab-neon i {
            font-size: 1.3rem;
            color: var(--accent-cyan);
            animation: fab-flicker 2s ease-in-out infinite;
        }

        @keyframes fab-flicker {
            0%, 100% {
                opacity: 1;
            }
            45% {
                opacity: 0.7;
            }
            55% {
                opacity: 0.9;
            }
            70% {
                opacity: 0.6;
            }
            85% {
                opacity: 1;
            }
        }

        /* Responsive */
        @media (max-width: 991.98px) {
            .article-hero h1 {
                font-size: 2rem;
            }
            .article-content {
                padding: 28px 22px;
            }
            .cta-box {
                padding: 35px 24px;
            }
            .cta-box h2 {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 575.98px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
            .article-hero h1 {
                font-size: 1.6rem;
            }
            .article-excerpt {
                font-size: 0.95rem;
                padding-left: 14px;
            }
            .article-content {
                padding: 20px 16px;
            }
            .article-content h2 {
                font-size: 1.4rem;
            }
            .navbar-brand-custom {
                font-size: 1.05rem;
            }
            .btn-login,
            .btn-signup {
                padding: 8px 16px;
                font-size: 0.82rem;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #0A2E1C;
            --bg-secondary: #123E25;
            --bg-dark: #071F13;
            --accent-gold: #FFD700;
            --accent-red: #D32F2F;
            --text-white: #FFFFFF;
            --text-mint: #D1F2EB;
            --text-muted: #A8C9BF;
            --border-gold: rgba(255, 215, 0, 0.4);
            --border-light: rgba(255, 255, 255, 0.08);
            --shadow-gold: 0 4px 20px rgba(255, 215, 0, 0.25);
            --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.35);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --font-sans: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

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

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-primary);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
            transition: var(--transition);
        }

        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* Header / Nav */
        .navbar-custom {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(7, 31, 19, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-gold);
            padding: 16px 0;
            transition: var(--transition);
        }

        .navbar-custom .container-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }

        .navbar-brand-custom {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--accent-gold);
            letter-spacing: -0.5px;
            white-space: nowrap;
        }

        .navbar-brand-custom .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--accent-gold), #B8860B);
            color: var(--bg-dark);
            border-radius: 10px;
            font-size: 1.2rem;
            box-shadow: 0 4px 12px rgba(255, 215, 0, 0.35);
        }

        .navbar-toggler-custom {
            display: none;
            background: transparent;
            color: var(--accent-gold);
            font-size: 1.5rem;
            padding: 8px 12px;
            border: 1px solid var(--border-gold);
            border-radius: 8px;
        }

        .navbar-collapse-custom {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .nav-link-custom {
            color: var(--text-mint);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 16px;
            border-radius: 20px;
            position: relative;
            transition: var(--transition);
        }

        .nav-link-custom:hover {
            color: var(--accent-gold);
            background: rgba(255, 215, 0, 0.08);
        }

        .nav-link-custom.active {
            color: var(--bg-dark);
            background: linear-gradient(135deg, var(--accent-gold), #E6C200);
            font-weight: 600;
            box-shadow: 0 4px 16px rgba(255, 215, 0, 0.3);
        }

        .btn-login {
            color: var(--accent-gold);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 10px 22px;
            border-radius: 24px;
            border: 1px solid var(--border-gold);
            background: transparent;
            transition: var(--transition);
        }

        .btn-login:hover {
            background: rgba(255, 215, 0, 0.12);
            border-color: var(--accent-gold);
            box-shadow: 0 0 20px rgba(255, 215, 0, 0.25);
        }

        .btn-signup {
            color: var(--bg-dark);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 10px 24px;
            border-radius: 24px;
            background: linear-gradient(135deg, var(--accent-gold), #FFC800);
            border: none;
            box-shadow: 0 4px 16px rgba(255, 215, 0, 0.4);
            transition: var(--transition);
        }

        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255, 215, 0, 0.55);
            background: linear-gradient(135deg, #FFE44D, #FFD700);
        }

        /* Hero Section */
        .hero-custom {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, rgba(7, 31, 19, 0.88) 0%, rgba(10, 46, 28, 0.78) 50%, rgba(7, 31, 19, 0.92) 100%),
                        url('/assets/images/backpic/back-1.jpg') center center / cover no-repeat;
            padding: 120px 0 80px;
            overflow: hidden;
        }

        .hero-custom::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 180px;
            background: linear-gradient(to top, var(--bg-primary) 0%, transparent 100%);
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 680px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 215, 0, 0.15);
            border: 1px solid var(--border-gold);
            color: var(--accent-gold);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 8px 18px;
            border-radius: 24px;
            margin-bottom: 24px;
            letter-spacing: 0.5px;
        }

        .hero-badge i {
            font-size: 0.9rem;
        }

        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.15;
            color: var(--text-white);
            margin-bottom: 20px;
            letter-spacing: -1px;
        }

        .hero-title .highlight {
            color: var(--accent-gold);
            position: relative;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-mint);
            line-height: 1.65;
            margin-bottom: 32px;
            max-width: 560px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 40px;
        }

        .btn-primary-custom {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--accent-gold), #E6A800);
            color: var(--bg-dark);
            font-weight: 700;
            font-size: 1.05rem;
            padding: 16px 32px;
            border-radius: 32px;
            border: none;
            box-shadow: 0 8px 28px rgba(255, 215, 0, 0.45);
            transition: var(--transition);
        }

        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 36px rgba(255, 215, 0, 0.6);
        }

        .btn-secondary-custom {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-white);
            font-weight: 600;
            font-size: 1.05rem;
            padding: 16px 28px;
            border-radius: 32px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(8px);
            transition: var(--transition);
        }

        .btn-secondary-custom:hover {
            background: rgba(255, 255, 255, 0.16);
            border-color: rgba(255, 255, 255, 0.35);
            transform: translateY(-3px);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }

        .hero-stat-item {
            display: flex;
            flex-direction: column;
        }

        .hero-stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-gold);
            line-height: 1.2;
        }

        .hero-stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* Section Base */
        .section-custom {
            padding: 80px 0;
        }

        .section-header {
            margin-bottom: 48px;
            text-align: left;
        }

        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-gold);
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-mint);
            line-height: 1.7;
            max-width: 640px;
        }

        /* Step / Feature Cards */
        .step-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

        .step-card {
            background: linear-gradient(145deg, var(--bg-secondary), #0E3320);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            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-gold), transparent);
        }

        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-gold);
            border-color: var(--accent-gold);
        }

        .step-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: rgba(255, 215, 0, 0.12);
            color: var(--accent-gold);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .step-number {
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--accent-gold);
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .step-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .step-card p {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.65;
            margin-bottom: 0;
        }

        /* Feature Split Section */
        .feature-split {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .feature-image-wrap {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-gold);
        }

        .feature-image-wrap img {
            width: 100%;
            height: 420px;
            object-fit: cover;
            transition: var(--transition);
        }

        .feature-image-wrap:hover img {
            transform: scale(1.04);
        }

        .feature-image-badge {
            position: absolute;
            bottom: 20px;
            left: 20px;
            background: rgba(7, 31, 19, 0.85);
            backdrop-filter: blur(8px);
            color: var(--accent-gold);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 10px 20px;
            border-radius: 24px;
            border: 1px solid var(--border-gold);
        }

        .feature-list {
            list-style: none;
            padding: 0;
            margin: 24px 0 0;
        }

        .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid var(--border-light);
            color: var(--text-mint);
            font-size: 1rem;
            line-height: 1.6;
        }

        .feature-list li:last-child {
            border-bottom: none;
        }

        .feature-list li i {
            color: var(--accent-gold);
            font-size: 1.1rem;
            margin-top: 3px;
            flex-shrink: 0;
        }

        /* Video Play Section */
        .video-showcase {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            min-height: 480px;
            background: linear-gradient(135deg, rgba(7, 31, 19, 0.75), rgba(18, 62, 37, 0.7)),
                        url('/assets/images/backpic/back-2.jpg') center center / cover no-repeat;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--border-gold);
            box-shadow: var(--shadow-card);
        }

        .play-button {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-gold), #E6A800);
            color: var(--bg-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.2rem;
            box-shadow: 0 8px 32px rgba(255, 215, 0, 0.5);
            transition: var(--transition);
            animation: pulsePlay 2s infinite;
        }

        .play-button:hover {
            transform: scale(1.12);
            box-shadow: 0 12px 40px rgba(255, 215, 0, 0.7);
        }

        @keyframes pulsePlay {
            0%, 100% { box-shadow: 0 8px 32px rgba(255, 215, 0, 0.5), 0 0 0 0 rgba(255, 215, 0, 0.35); }
            50% { box-shadow: 0 8px 32px rgba(255, 215, 0, 0.5), 0 0 0 24px rgba(255, 215, 0, 0); }
        }

        .video-overlay-text {
            position: absolute;
            bottom: 30px;
            left: 30px;
            color: var(--text-white);
            font-weight: 600;
            font-size: 1.1rem;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
        }

        /* Download / CTA */
        .download-card {
            background: linear-gradient(145deg, var(--bg-secondary), #0B2F1E);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-lg);
            padding: 40px;
            display: flex;
            align-items: center;
            gap: 40px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-card);
        }

        .download-card-icon {
            width: 80px;
            height: 80px;
            border-radius: 20px;
            background: rgba(255, 215, 0, 0.12);
            color: var(--accent-gold);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.2rem;
            flex-shrink: 0;
        }

        .download-card-content {
            flex: 1;
            min-width: 240px;
        }

        .download-card-content h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .download-card-content p {
            color: var(--text-muted);
            margin-bottom: 0;
        }

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

        .accordion-custom .accordion-item {
            background: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md) !important;
            margin-bottom: 16px;
            overflow: hidden;
        }

        .accordion-custom .accordion-button {
            background: transparent;
            color: var(--text-white);
            font-weight: 600;
            font-size: 1.05rem;
            padding: 20px 24px;
            box-shadow: none;
            border: none;
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            background: rgba(255, 215, 0, 0.06);
            color: var(--accent-gold);
        }

        .accordion-custom .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.2);
            border: none;
        }

        .accordion-custom .accordion-button::after {
            filter: brightness(0) invert(1);
        }

        .accordion-custom .accordion-body {
            color: var(--text-mint);
            font-size: 0.95rem;
            line-height: 1.7;
            padding: 20px 24px;
        }

        /* Footer */
        .footer-custom {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-gold);
            padding: 60px 0 30px;
            margin-top: 80px;
        }

        .footer-brand {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--accent-gold);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
        }

        .footer-custom p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        .footer-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }

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

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

        .footer-links a {
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: var(--transition);
        }

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

        .footer-bottom {
            border-top: 1px solid var(--border-light);
            margin-top: 40px;
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* FAB */
        .fab-custom {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 1050;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(145deg, var(--accent-gold), #B8860B);
            color: var(--bg-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 4px 20px rgba(255, 215, 0, 0.35);
            border: 2px solid #FFE44D;
            opacity: 0.7;
            animation: floatBreath 3s ease-in-out infinite;
            transition: var(--transition);
            cursor: pointer;
        }

        .fab-custom:hover {
            opacity: 1;
            transform: scale(1.12) rotate(360deg);
            box-shadow: 0 8px 32px rgba(255, 215, 0, 0.6);
        }

        .fab-custom:active {
            transform: scale(0.95) translateY(2px);
        }

        .fab-custom .notification-dot {
            position: absolute;
            top: 4px;
            right: 4px;
            width: 14px;
            height: 14px;
            background: #FF0040;
            border-radius: 50%;
            border: 2px solid var(--bg-dark);
            animation: blinkDot 1.5s infinite;
        }

        @keyframes floatBreath {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-8px); }
        }

        @keyframes blinkDot {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.3; }
        }

        /* Responsive */
        @media (max-width: 992px) {
            .navbar-toggler-custom {
                display: block;
            }

            .navbar-collapse-custom {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                padding-top: 16px;
                gap: 8px;
            }

            .navbar-collapse-custom.show {
                display: flex;
            }

            .navbar-collapse-custom .d-flex {
                flex-direction: column;
                gap: 4px;
            }

            .navbar-collapse-custom .btn-login,
            .navbar-collapse-custom .btn-signup {
                width: 100%;
                text-align: center;
            }

            .hero-title {
                font-size: 2.5rem;
            }

            .feature-split {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .feature-image-wrap img {
                height: 320px;
            }
        }

        @media (max-width: 768px) {
            .section-custom {
                padding: 56px 0;
            }

            .section-title {
                font-size: 1.9rem;
            }

            .hero-custom {
                padding: 100px 0 60px;
                min-height: auto;
            }

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

            .hero-subtitle {
                font-size: 1rem;
            }

            .hero-stats {
                gap: 24px;
            }

            .hero-stat-number {
                font-size: 1.5rem;
            }

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

            .download-card {
                padding: 24px;
                flex-direction: column;
                align-items: flex-start;
                gap: 20px;
            }

            .video-showcase {
                min-height: 320px;
            }

            .play-button {
                width: 72px;
                height: 72px;
                font-size: 1.6rem;
            }

            .fab-custom {
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
                left: 12px;
                bottom: 84px;
            }

            .footer-custom {
                padding: 40px 0 20px;
                margin-top: 50px;
            }
        }

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

            .navbar-brand-custom {
                font-size: 1.1rem;
            }

            .navbar-brand-custom .brand-icon {
                width: 34px;
                height: 34px;
                font-size: 1rem;
            }

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

            .section-title {
                font-size: 1.6rem;
            }

            .btn-primary-custom,
            .btn-secondary-custom {
                font-size: 0.9rem;
                padding: 13px 22px;
            }

            .video-showcase {
                min-height: 240px;
            }
        }

/* roulang page: category2 */
:root {
            --bg-deep: #0A0A0F;
            --bg-card: #12121A;
            --bg-elevated: #1A1A26;
            --bg-soft: #1F1F2E;
            --gold-primary: #FFD700;
            --gold-bright: #FFC107;
            --gold-soft: #F0E68C;
            --text-primary: #FFFFFF;
            --text-secondary: #D5D8DC;
            --text-muted: #A6ACAF;
            --border-gold: rgba(255, 215, 0, 0.25);
            --border-soft: rgba(255, 255, 255, 0.08);
            --shadow-gold: 0 8px 32px rgba(255, 215, 0, 0.12);
            --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.45);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --spacing-section: 84px;
            --font-body: 'Inter', 'Segoe UI', 'Be Vietnam Pro', sans-serif;
            --transition-base: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-body);
            background-color: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.65;
            margin: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        a {
            color: var(--gold-primary);
            text-decoration: none;
            transition: var(--transition-base);
        }
        a:hover, a:focus {
            color: var(--gold-bright);
            text-decoration: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, .btn {
            cursor: pointer;
            transition: var(--transition-base);
        }
        button:focus, a:focus, input:focus, select:focus {
            outline: 2px solid var(--gold-primary);
            outline-offset: 2px;
        }
        .container-custom {
            width: 100%;
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        @media (max-width: 768px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
        }
        .navbar-custom {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            background: rgba(10, 10, 15, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-soft);
            padding: 14px 0;
            transition: var(--transition-smooth);
        }
        .navbar-custom.scrolled {
            background: rgba(10, 10, 15, 0.96);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
        }
        .navbar-brand-custom {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-primary);
            font-weight: 700;
            font-size: 1.35rem;
            letter-spacing: -0.01em;
            text-decoration: none;
            transition: var(--transition-base);
        }
        .navbar-brand-custom:hover {
            color: var(--gold-primary);
        }
        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--gold-primary), #B8860B);
            border-radius: 12px;
            color: #0A0A0F;
            font-size: 1.2rem;
            box-shadow: 0 4px 16px rgba(255, 215, 0, 0.3);
        }
        .navbar-toggler-custom {
            display: none;
            background: transparent;
            border: 1px solid var(--border-soft);
            border-radius: 10px;
            color: var(--text-primary);
            font-size: 1.3rem;
            padding: 8px 14px;
            cursor: pointer;
            transition: var(--transition-base);
        }
        .navbar-toggler-custom:hover {
            border-color: var(--gold-primary);
            color: var(--gold-primary);
        }
        .navbar-collapse-custom {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        .nav-link-custom {
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 14px;
            border-radius: 8px;
            transition: var(--transition-base);
            white-space: nowrap;
        }
        .nav-link-custom:hover {
            color: var(--gold-primary);
            background: rgba(255, 215, 0, 0.08);
        }
        .nav-link-custom.active {
            color: var(--gold-primary);
            background: rgba(255, 215, 0, 0.12);
            font-weight: 600;
        }
        .btn-login {
            background: transparent;
            border: 1px solid var(--border-gold);
            color: var(--gold-primary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 10px 22px;
            border-radius: 10px;
            transition: var(--transition-base);
        }
        .btn-login:hover {
            background: rgba(255, 215, 0, 0.1);
            border-color: var(--gold-primary);
        }
        .btn-signup {
            background: linear-gradient(135deg, var(--gold-primary), #E6A800);
            border: none;
            color: #0A0A0F;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 10px 24px;
            border-radius: 10px;
            box-shadow: 0 4px 16px rgba(255, 215, 0, 0.3);
            transition: var(--transition-base);
        }
        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255, 215, 0, 0.4);
        }
        .btn-gold {
            background: linear-gradient(135deg, var(--gold-primary), #E6A800);
            border: none;
            color: #0A0A0F;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(255, 215, 0, 0.28);
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .btn-gold:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(255, 215, 0, 0.42);
            color: #0A0A0F;
        }
        .btn-outline-gold {
            background: transparent;
            border: 1.5px solid var(--gold-primary);
            color: var(--gold-primary);
            font-weight: 600;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: 12px;
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .btn-outline-gold:hover {
            background: rgba(255, 215, 0, 0.1);
            color: var(--gold-primary);
        }
        .hero-guide {
            padding-top: 140px;
            padding-bottom: 72px;
            background: linear-gradient(180deg, #0A0A0F 0%, #12121A 60%, #0D0D13 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-guide::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(255, 215, 0, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-guide::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255, 215, 0, 0.05) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 215, 0, 0.12);
            border: 1px solid var(--border-gold);
            color: var(--gold-primary);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 8px 16px;
            border-radius: 999px;
            margin-bottom: 20px;
            letter-spacing: 0.02em;
        }
        .hero-title {
            font-size: 2.75rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
            color: var(--text-primary);
        }
        .hero-title .highlight {
            background: linear-gradient(135deg, var(--gold-primary), var(--gold-soft));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 620px;
            line-height: 1.7;
            margin-bottom: 28px;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 12px;
        }
        .stat-chip {
            background: var(--bg-card);
            border: 1px solid var(--border-soft);
            border-radius: 12px;
            padding: 14px 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-secondary);
            font-size: 0.9rem;
            font-weight: 500;
        }
        .stat-chip i {
            color: var(--gold-primary);
            font-size: 1.1rem;
        }
        .hero-image-wrapper {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-soft);
            background: var(--bg-card);
        }
        .hero-image-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            aspect-ratio: 4/3;
        }
        .hero-image-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(0deg, rgba(0,0,0,0.8) 0%, transparent 100%);
            padding: 20px;
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 12px;
        }
        .hero-image-overlay span {
            color: var(--gold-primary);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .section-guide {
            padding: var(--spacing-section) 0;
        }
        .section-guide-alt {
            background: var(--bg-card);
            padding: var(--spacing-section) 0;
            border-top: 1px solid var(--border-soft);
            border-bottom: 1px solid var(--border-soft);
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.015em;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .section-lead {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 720px;
            margin-bottom: 40px;
            line-height: 1.7;
        }
        .step-guide {
            background: var(--bg-card);
            border: 1px solid var(--border-soft);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            height: 100%;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .step-guide:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-4px);
        }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            background: linear-gradient(135deg, var(--gold-primary), #B8860B);
            color: #0A0A0F;
            font-weight: 800;
            font-size: 1.2rem;
            border-radius: 12px;
            margin-bottom: 16px;
        }
        .step-guide h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .step-guide p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
            line-height: 1.65;
        }
        .step-guide .step-tip {
            display: inline-block;
            margin-top: 12px;
            font-size: 0.82rem;
            color: var(--gold-primary);
            font-weight: 600;
        }
        .guide-visual-card {
            background: var(--bg-card);
            border: 1px solid var(--border-soft);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition-smooth);
            height: 100%;
        }
        .guide-visual-card:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
        }
        .guide-visual-card img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            transition: var(--transition-smooth);
        }
        .guide-visual-card:hover img {
            transform: scale(1.04);
        }
        .guide-visual-card .card-body-guide {
            padding: 22px 20px;
        }
        .guide-visual-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .guide-visual-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .device-tabs {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }
        .device-tab {
            background: var(--bg-card);
            border: 1px solid var(--border-soft);
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 12px 24px;
            border-radius: 12px;
            cursor: pointer;
            transition: var(--transition-base);
        }
        .device-tab:hover, .device-tab.active {
            background: rgba(255, 215, 0, 0.12);
            border-color: var(--gold-primary);
            color: var(--gold-primary);
        }
        .faq-custom {
            background: var(--bg-card);
            border: 1px solid var(--border-soft);
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition-base);
        }
        .faq-custom:hover {
            border-color: var(--border-gold);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition-base);
        }
        .faq-question i {
            color: var(--gold-primary);
            font-size: 1rem;
            transition: transform 0.3s ease;
        }
        .faq-custom.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-custom.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .cta-section {
            padding: 72px 0;
            background: linear-gradient(135deg, #1A1A26 0%, #12121A 100%);
            border-radius: var(--radius-lg);
            margin: 0 0 var(--spacing-section);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255, 215, 0, 0.1) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .cta-text {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 28px;
            max-width: 520px;
            line-height: 1.7;
        }
        .footer-custom {
            background: #060608;
            border-top: 1px solid var(--border-soft);
            padding: 64px 0 32px;
            margin-top: 0;
        }
        .footer-brand {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
        }
        .footer-brand i {
            color: var(--gold-primary);
        }
        .footer-custom p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
        }
        .footer-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: var(--text-muted);
            font-size: 0.92rem;
            transition: var(--transition-base);
        }
        .footer-links a:hover {
            color: var(--gold-primary);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-soft);
            margin-top: 48px;
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            color: var(--text-muted);
            font-size: 0.85rem;
        }
        .fab-custom {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 1040;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--gold-primary), #B8860B);
            border: 2px solid var(--gold-bright);
            color: #0A0A0F;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 20px rgba(255, 215, 0, 0.3);
            transition: var(--transition-smooth);
            animation: fabFloat 3s ease-in-out infinite;
        }
        .fab-custom:hover {
            transform: scale(1.1);
            box-shadow: 0 8px 28px rgba(255, 215, 0, 0.45);
        }
        @keyframes fabFloat {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-6px); }
        }
        @media (max-width: 992px) {
            .navbar-toggler-custom {
                display: block;
            }
            .navbar-collapse-custom {
                display: none;
                flex-direction: column;
                align-items: stretch;
                background: rgba(10, 10, 15, 0.98);
                padding: 20px;
                border-radius: 12px;
                margin-top: 14px;
                border: 1px solid var(--border-soft);
                width: 100%;
            }
            .navbar-collapse-custom.show {
                display: flex;
            }
            .hero-title {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            :root {
                --spacing-section: 56px;
            }
            .hero-guide {
                padding-top: 110px;
                padding-bottom: 48px;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .cta-title {
                font-size: 1.4rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.5rem;
            }
            .btn-gold, .btn-outline-gold {
                font-size: 0.9rem;
                padding: 12px 20px;
            }
            .device-tab {
                padding: 10px 16px;
                font-size: 0.85rem;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.92rem;
            }
            .stat-chip {
                font-size: 0.8rem;
                padding: 10px 14px;
            }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #08090F;
            --bg-secondary: #0D111E;
            --bg-card: #121826;
            --bg-card-hover: #1A2234;
            --accent-primary: #0052FF;
            --accent-secondary: #00F0FF;
            --accent-glow: rgba(0, 240, 255, 0.5);
            --text-primary: #FFFFFF;
            --text-secondary: #CBD5E1;
            --text-muted: #7C8BA1;
            --border-color: rgba(0, 240, 255, 0.2);
            --border-hover: rgba(0, 240, 255, 0.6);
            --gradient-main: linear-gradient(135deg, #0052FF 0%, #00F0FF 100%);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
            --shadow-btn: 0 4px 15px rgba(0, 82, 255, 0.4);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --spacing-xxl: 80px;
            --font-body: 'Inter', 'Segoe UI', 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-medium: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

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

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

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

        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--spacing-md);
            padding-right: var(--spacing-md);
        }

        /* Header / Navigation */
        .navbar-custom {
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            transition: all var(--transition-medium);
        }

        .navbar-brand-custom {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.15rem;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

        .navbar-brand-custom:hover {
            color: var(--text-primary);
            opacity: 0.9;
        }

        .brand-icon {
            width: 38px;
            height: 38px;
            background: var(--gradient-main);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #fff;
            box-shadow: var(--shadow-glow);
            flex-shrink: 0;
        }

        .navbar-toggler-custom {
            display: none;
            width: 44px;
            height: 44px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-size: 1.3rem;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
            background: rgba(255, 255, 255, 0.03);
        }

        .navbar-toggler-custom:hover {
            border-color: var(--border-hover);
            background: rgba(0, 240, 255, 0.1);
        }

        .navbar-collapse-custom {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .nav-link-custom {
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.9rem;
            padding: 8px 16px;
            border-radius: 999px;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .nav-link-custom:hover {
            color: var(--text-primary);
            background: rgba(0, 240, 255, 0.08);
        }

        .nav-link-custom.active {
            color: #fff;
            background: rgba(0, 82, 255, 0.25);
            box-shadow: inset 0 0 0 1px rgba(0, 82, 255, 0.5);
        }

        .nav-link-custom.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--gradient-main);
            border-radius: 2px;
        }

        .btn-login {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 18px;
            border-radius: 999px;
            border: 1px solid rgba(255, 255, 255, 0.25);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

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

        .btn-signup {
            background: var(--gradient-main);
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 9px 22px;
            border-radius: 999px;
            box-shadow: var(--shadow-btn);
            transition: all var(--transition-medium);
            white-space: nowrap;
            letter-spacing: 0.2px;
        }

        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 82, 255, 0.6);
            color: #fff;
        }

        /* Hero Section */
        .hero-custom {
            background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
            padding: var(--spacing-xl) 0 var(--spacing-lg);
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid rgba(0, 240, 255, 0.1);
        }

        .hero-custom::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 82, 255, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-custom::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.1) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-title {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.5px;
            margin-bottom: var(--spacing-sm);
            background: linear-gradient(135deg, #fff 30%, var(--accent-secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 580px;
            line-height: 1.7;
            margin-bottom: var(--spacing-md);
        }

        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            margin-bottom: var(--spacing-md);
        }

        .hero-meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 240, 255, 0.06);
            border: 1px solid rgba(0, 240, 255, 0.2);
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }

        .hero-meta-item i {
            color: var(--accent-secondary);
            font-size: 0.9rem;
        }

        .btn-primary-custom {
            background: var(--gradient-main);
            color: #fff;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: 999px;
            font-size: 1rem;
            box-shadow: var(--shadow-btn);
            transition: all var(--transition-medium);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            letter-spacing: 0.2px;
        }

        .btn-primary-custom:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(0, 82, 255, 0.7);
            color: #fff;
        }

        .btn-secondary-custom {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 13px 28px;
            border-radius: 999px;
            border: 1px solid rgba(255, 255, 255, 0.3);
            transition: all var(--transition-medium);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

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

        .hero-panel {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            box-shadow: var(--shadow-card);
            position: relative;
        }

        .hero-panel-title {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: var(--spacing-sm);
        }

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

        .rank-list-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .rank-list-item:last-child {
            border-bottom: none;
        }

        .rank-number {
            width: 28px;
            height: 28px;
            background: rgba(0, 82, 255, 0.2);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.8rem;
            color: var(--accent-secondary);
            flex-shrink: 0;
        }

        .rank-name {
            flex: 1;
            font-weight: 500;
            font-size: 0.9rem;
        }

        .rank-badge {
            font-size: 0.75rem;
            color: var(--accent-secondary);
            background: rgba(0, 240, 255, 0.1);
            padding: 3px 10px;
            border-radius: 999px;
            white-space: nowrap;
        }

        /* Section Styles */
        .section-custom {
            padding: var(--spacing-xl) 0;
        }

        .section-header {
            margin-bottom: var(--spacing-lg);
        }

        .section-label {
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--accent-secondary);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: var(--spacing-xs);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .section-label::before {
            content: '';
            width: 24px;
            height: 2px;
            background: var(--gradient-main);
            border-radius: 2px;
        }

        .section-title {
            font-size: clamp(1.4rem, 3vw, 2rem);
            font-weight: 700;
            letter-spacing: -0.3px;
            color: var(--text-primary);
            line-height: 1.3;
            margin-bottom: var(--spacing-sm);
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 700px;
            line-height: 1.7;
        }

        /* Step Cards */
        .step-card {
            background: var(--bg-card);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            height: 100%;
            transition: all var(--transition-medium);
            position: relative;
            overflow: hidden;
        }

        .step-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
            background: var(--bg-card-hover);
        }

        .step-number {
            width: 44px;
            height: 44px;
            background: var(--gradient-main);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            color: #fff;
            margin-bottom: var(--spacing-sm);
            box-shadow: var(--shadow-btn);
        }

        .step-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: var(--spacing-xs);
            color: var(--text-primary);
        }

        .step-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Feature List */
        .feature-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .feature-list-item {
            display: flex;
            gap: 12px;
            padding: 14px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            align-items: flex-start;
        }

        .feature-list-item:last-child {
            border-bottom: none;
        }

        .feature-icon {
            width: 36px;
            height: 36px;
            background: rgba(0, 240, 255, 0.1);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-secondary);
            flex-shrink: 0;
            font-size: 0.9rem;
        }

        .feature-content {
            flex: 1;
        }

        .feature-title {
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 4px;
            color: var(--text-primary);
        }

        .feature-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* Info Panel */
        .info-panel {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            position: relative;
            overflow: hidden;
        }

        .info-panel::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: var(--gradient-main);
        }

        .info-panel-title {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: var(--spacing-sm);
        }

        .info-panel-text {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* FAQ Section */
        .faq-custom .accordion-item {
            background: var(--bg-card);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md) !important;
            margin-bottom: var(--spacing-sm);
            overflow: hidden;
            transition: all var(--transition-fast);
        }

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

        .faq-custom .accordion-button {
            background: var(--bg-card);
            color: var(--text-primary);
            font-weight: 600;
            padding: 18px 20px;
            font-size: 0.95rem;
            box-shadow: none;
            border-radius: var(--radius-md) !important;
        }

        .faq-custom .accordion-button:not(.collapsed) {
            background: var(--bg-card-hover);
            color: var(--accent-secondary);
            box-shadow: none;
        }

        .faq-custom .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.3);
            border-color: var(--border-hover);
        }

        .faq-custom .accordion-body {
            background: var(--bg-card);
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
            padding: 16px 20px 20px;
        }

        .faq-custom .accordion-button::after {
            filter: invert(1) brightness(2);
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            border-bottom: 1px solid rgba(0, 240, 255, 0.15);
            padding: var(--spacing-xl) 0;
        }

        .cta-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-card);
        }

        .cta-title {
            font-size: clamp(1.3rem, 3vw, 1.8rem);
            font-weight: 700;
            margin-bottom: var(--spacing-sm);
        }

        .cta-text {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: var(--spacing-md);
        }

        /* Footer */
        .footer-custom {
            background: var(--bg-primary);
            border-top: 1px solid rgba(0, 240, 255, 0.1);
            padding: var(--spacing-xl) 0 var(--spacing-md);
        }

        .footer-brand {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            display: flex;
            align-items: center;
        }

        .footer-custom p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 400px;
        }

        .footer-title {
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

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

        .footer-links li {
            margin-bottom: 8px;
        }

        .footer-links a {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

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

        .footer-bottom {
            margin-top: var(--spacing-lg);
            padding-top: var(--spacing-md);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: var(--spacing-sm);
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* FAB */
        .fab-custom {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0.75);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-secondary);
            font-size: 1.3rem;
            cursor: pointer;
            transition: all var(--transition-medium);
            opacity: 0.6;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
            position: relative;
        }

        .fab-custom::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 50%;
            background: linear-gradient(135deg, #0052FF, #00F0FF);
            z-index: -1;
            opacity: 0.6;
            transition: opacity var(--transition-fast);
        }

        .fab-custom:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.7);
            color: #fff;
        }

        .fab-custom:hover::before {
            opacity: 1;
        }

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

        .fab-notification {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 12px;
            height: 12px;
            background: #FF007F;
            border-radius: 50%;
            border: 2px solid var(--bg-primary);
            animation: blink 1.5s ease-in-out infinite;
        }

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

        /* Responsive */
        @media (max-width: 991.98px) {
            .navbar-toggler-custom {
                display: flex;
            }

            .navbar-collapse-custom {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                border-bottom: 1px solid rgba(0, 240, 255, 0.2);
                padding: var(--spacing-sm) var(--spacing-md);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                z-index: 1000;
            }

            .navbar-collapse-custom.show {
                display: flex;
            }

            .nav-link-custom {
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                display: block;
            }

            .navbar-collapse-custom .d-flex {
                flex-direction: column;
                gap: 8px;
            }

            .navbar-collapse-custom .btn-login,
            .navbar-collapse-custom .btn-signup {
                width: 100%;
                text-align: center;
                justify-content: center;
            }

            .hero-custom {
                padding: var(--spacing-lg) 0;
            }

            .hero-panel {
                margin-top: var(--spacing-md);
            }
        }

        @media (max-width: 767.98px) {
            :root {
                --spacing-xl: 40px;
                --spacing-lg: 28px;
                --spacing-md: 20px;
                --spacing-sm: 12px;
            }

            .hero-title {
                font-size: 1.6rem;
            }

            .hero-subtitle {
                font-size: 0.95rem;
            }

            .section-title {
                font-size: 1.3rem;
            }

            .btn-primary-custom,
            .btn-secondary-custom {
                width: 100%;
                justify-content: center;
                padding: 12px 20px;
                font-size: 0.9rem;
            }

            .hero-meta {
                flex-direction: column;
            }

            .hero-meta-item {
                justify-content: flex-start;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }

            .fab-custom {
                width: 48px;
                height: 48px;
                font-size: 1.1rem;
                left: 12px;
                bottom: 80px;
            }
        }

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

            .navbar-brand-custom {
                font-size: 1rem;
            }

            .brand-icon {
                width: 32px;
                height: 32px;
                font-size: 0.9rem;
                border-radius: 8px;
            }

            .hero-title {
                font-size: 1.4rem;
            }

            .step-card {
                padding: var(--spacing-sm);
            }

            .info-panel {
                padding: var(--spacing-md);
            }

            .cta-card {
                padding: var(--spacing-md);
            }
        }

        @media (min-width: 992px) {
            .navbar-collapse-custom {
                display: flex !important;
            }

            .navbar-toggler-custom {
                display: none;
            }
        }