/* roulang page: index */
:root {
            --royal-crimson: #450A0A;
            --midnight-wine: #2B0404;
            --emperor-gold: #FBBF24;
            --warm-mandarine: #F97316;
            --alabaster: #FFFBEB;
            --gold-leaf: #FDE68A;
            --warm-taupe: #E7E5E4;
            --bg-primary: #450A0A;
            --bg-secondary: #2B0404;
            --text-primary: #FFFBEB;
            --text-secondary: #FDE68A;
            --text-body: #E7E5E4;
            --accent: #FBBF24;
            --accent-hover: #F59E0B;
            --border-subtle: rgba(245, 158, 11, 0.2);
            --border-gold: rgba(251, 191, 36, 0.4);
            --shadow-gold: 0 4px 20px rgba(245, 158, 11, 0.25);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        h1, h2, h3, h4, .display-font {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 640px) {
            .container { padding-left: 2rem; padding-right: 2rem; }
        }
        @media (min-width: 1024px) {
            .container { padding-left: 2.5rem; padding-right: 2.5rem; }
        }

        /* Navigation */
        .site-header {
            background: rgba(43, 4, 4, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition-smooth);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 1.5rem;
        }

        .nav-logo {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--emperor-gold);
            white-space: nowrap;
            letter-spacing: -0.02em;
            transition: var(--transition-smooth);
        }
        .nav-logo:hover {
            color: var(--accent-hover);
        }

        .nav-links {
            display: none;
            align-items: center;
            gap: 0.25rem;
        }

        @media (min-width: 1024px) {
            .nav-links { display: flex; }
        }

        .nav-link {
            padding: 0.5rem 0.9rem;
            border-radius: 0.5rem;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-primary);
            transition: var(--transition-smooth);
            position: relative;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--emperor-gold);
            background: rgba(245, 158, 11, 0.1);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .btn-login {
            padding: 0.45rem 1.1rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--gold-leaf);
            background: transparent;
            border: 1.5px solid var(--border-gold);
            transition: var(--transition-smooth);
        }
        .btn-login:hover {
            background: rgba(245, 158, 11, 0.12);
            border-color: var(--accent);
        }

        .btn-signup {
            padding: 0.45rem 1.2rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 2px 10px rgba(245, 158, 11, 0.3);
            transition: var(--transition-smooth);
        }
        .btn-signup:hover {
            box-shadow: 0 4px 18px rgba(245, 158, 11, 0.45);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 0.5rem;
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-primary);
            font-size: 1.25rem;
        }
        @media (min-width: 1024px) {
            .mobile-menu-btn { display: none; }
        }

        /* Mobile nav drawer */
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: rgba(43, 4, 4, 0.98);
            backdrop-filter: blur(20px);
            padding: 1rem 1.5rem 1.5rem;
            gap: 0.4rem;
        }
        .mobile-nav.open { display: flex; }
        .mobile-nav .nav-link {
            padding: 0.7rem 1rem;
            border-radius: 0.5rem;
        }

        /* Hero */
        .hero-section {
            position: relative;
            padding: 4rem 0 3rem;
            background: linear-gradient(180deg, #2B0404 0%, #450A0A 100%);
            overflow: hidden;
        }
        @media (min-width: 768px) {
            .hero-section { padding: 5rem 0 4rem; }
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2.5rem;
            align-items: center;
        }
        @media (min-width: 1024px) {
            .hero-grid { grid-template-columns: 1fr 1fr; gap: 3rem; }
        }

        .hero-tag {
            display: inline-block;
            padding: 0.35rem 0.9rem;
            border-radius: 999px;
            background: rgba(251, 191, 36, 0.15);
            border: 1px solid var(--border-gold);
            color: var(--gold-leaf);
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 1rem;
            letter-spacing: 0.02em;
        }

        .hero-title {
            font-size: 2.2rem;
            font-weight: 900;
            line-height: 1.15;
            color: var(--alabaster);
            margin-bottom: 1.2rem;
            letter-spacing: -0.03em;
        }
        @media (min-width: 640px) {
            .hero-title { font-size: 2.8rem; }
        }
        @media (min-width: 1024px) {
            .hero-title { font-size: 3.4rem; }
        }

        .hero-desc {
            font-size: 1.05rem;
            line-height: 1.65;
            color: var(--warm-taupe);
            margin-bottom: 1.8rem;
            max-width: 540px;
        }

        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.8rem;
            border-radius: 0.6rem;
            font-weight: 700;
            font-size: 0.95rem;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
            transition: var(--transition-smooth);
        }
        .btn-primary:hover {
            box-shadow: 0 6px 24px rgba(245, 158, 11, 0.45);
            transform: translateY(-2px);
        }

        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.8rem;
            border-radius: 0.6rem;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--gold-leaf);
            background: transparent;
            border: 1.5px solid var(--border-gold);
            transition: var(--transition-smooth);
        }
        .btn-outline-light:hover {
            background: rgba(245, 158, 11, 0.1);
            border-color: var(--accent);
        }

        .hero-visual {
            position: relative;
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-gold);
            background: linear-gradient(145deg, #2B0404 0%, #1a0202 100%);
            padding: 0;
            min-height: 280px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-visual img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        /* Section common */
        .section {
            padding: 3.5rem 0;
        }
        @media (min-width: 768px) {
            .section { padding: 4.5rem 0; }
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--emperor-gold);
            margin-bottom: 0.5rem;
        }

        .section-title {
            font-size: 1.7rem;
            font-weight: 800;
            color: var(--alabaster);
            margin-bottom: 0.8rem;
            letter-spacing: -0.02em;
            line-height: 1.25;
        }
        @media (min-width: 768px) {
            .section-title { font-size: 2rem; }
        }

        .section-desc {
            color: var(--warm-taupe);
            font-size: 1rem;
            line-height: 1.6;
            max-width: 680px;
        }

        .section-header {
            margin-bottom: 2.5rem;
        }
        @media (min-width: 768px) {
            .section-header { margin-bottom: 3rem; }
        }

        /* Cards */
        .card {
            background: rgba(43, 4, 4, 0.7);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            transition: var(--transition-smooth);
        }
        .card:hover {
            border-color: var(--border-gold);
            box-shadow: 0 4px 20px rgba(245, 158, 11, 0.12);
            transform: translateY(-2px);
        }

        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 0.75rem;
            background: rgba(251, 191, 36, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--emperor-gold);
            font-size: 1.4rem;
            margin-bottom: 1rem;
        }

        .card-title {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--alabaster);
            margin-bottom: 0.5rem;
        }

        .card-desc {
            font-size: 0.9rem;
            color: var(--warm-taupe);
            line-height: 1.5;
        }

        /* KPI */
        .kpi-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1rem;
        }
        @media (min-width: 640px) {
            .kpi-grid { grid-template-columns: repeat(4, 1fr); }
        }

        .kpi-card {
            text-align: center;
            padding: 1.5rem 1rem;
            background: rgba(43, 4, 4, 0.6);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
        }
        .kpi-number {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-size: 2rem;
            font-weight: 900;
            color: var(--emperor-gold);
            line-height: 1.1;
        }
        .kpi-label {
            font-size: 0.85rem;
            color: var(--warm-taupe);
            margin-top: 0.3rem;
        }

        /* Before After */
        .ba-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        @media (min-width: 640px) {
            .ba-grid { grid-template-columns: 1fr 1fr; }
        }

        .ba-card {
            border-radius: var(--radius-xl);
            padding: 1.8rem;
            border: 1px solid var(--border-subtle);
            position: relative;
        }
        .ba-card.before {
            background: rgba(220, 38, 38, 0.08);
            border-color: rgba(220, 38, 38, 0.25);
        }
        .ba-card.after {
            background: rgba(16, 185, 129, 0.08);
            border-color: rgba(16, 185, 129, 0.25);
        }
        .ba-badge {
            position: absolute;
            top: -12px;
            left: 1.5rem;
            padding: 0.25rem 1rem;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.03em;
        }
        .ba-badge.before-badge {
            background: #DC2626;
            color: #fff;
        }
        .ba-badge.after-badge {
            background: #10B981;
            color: #fff;
        }
        .ba-list {
            margin-top: 1rem;
            list-style: none;
        }
        .ba-list li {
            padding: 0.4rem 0;
            font-size: 0.9rem;
            color: var(--text-body);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .ba-list li i {
            font-size: 0.8rem;
        }

        /* Milestones */
        .milestone-track {
            position: relative;
            padding-left: 2rem;
        }
        .milestone-track::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(180deg, var(--border-gold), transparent);
        }
        .milestone-item {
            position: relative;
            padding-bottom: 2rem;
        }
        .milestone-dot {
            position: absolute;
            left: -2rem;
            top: 4px;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--emperor-gold);
            box-shadow: 0 0 12px rgba(251, 191, 36, 0.4);
            border: 3px solid #450A0A;
        }
        .milestone-year {
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--gold-leaf);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .milestone-title {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--alabaster);
            margin: 0.15rem 0 0.3rem;
        }

        /* Article cards */
        .article-card {
            background: rgba(43, 4, 4, 0.6);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition-smooth);
        }
        .article-card:hover {
            border-color: var(--border-gold);
            box-shadow: 0 6px 22px rgba(245, 158, 11, 0.12);
        }
        .article-card-img {
            height: 180px;
            overflow: hidden;
            background: #1a0202;
        }
        .article-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .article-card:hover .article-card-img img {
            transform: scale(1.05);
        }
        .article-card-body {
            padding: 1.2rem;
        }
        .article-card-title {
            font-weight: 700;
            font-size: 1rem;
            color: var(--alabaster);
            margin-bottom: 0.4rem;
            line-height: 1.4;
        }
        .article-card-meta {
            font-size: 0.8rem;
            color: var(--warm-taupe);
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 1.1rem 0;
            font-weight: 600;
            font-size: 1rem;
            color: var(--alabaster);
            background: transparent;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            transition: var(--transition-smooth);
        }
        .faq-question:hover {
            color: var(--emperor-gold);
        }
        .faq-answer {
            padding: 0 0 1.1rem;
            font-size: 0.9rem;
            color: var(--warm-taupe);
            line-height: 1.6;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-question i {
            transition: transform 0.3s ease;
            font-size: 0.8rem;
            color: var(--emperor-gold);
        }

        /* Footer */
        .site-footer {
            background: #2B0404;
            border-top: 1px solid var(--border-subtle);
            padding: 3rem 0 2rem;
            font-size: 0.9rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        @media (min-width: 640px) {
            .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
        }
        @media (min-width: 1024px) {
            .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
        }
        .footer-brand {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--emperor-gold);
            margin-bottom: 0.8rem;
        }
        .footer-desc {
            color: var(--warm-taupe);
            line-height: 1.5;
            margin-bottom: 1rem;
        }
        .footer-heading {
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--alabaster);
            margin-bottom: 0.8rem;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.4rem;
        }
        .footer-links a {
            color: var(--warm-taupe);
            font-size: 0.875rem;
            transition: var(--transition-smooth);
        }
        .footer-links a:hover {
            color: var(--emperor-gold);
        }
        .footer-bottom {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-subtle);
            text-align: center;
            color: var(--warm-taupe);
            font-size: 0.825rem;
        }

/* roulang page: article */
:root {
            --royal-crimson: #450A0A;
            --midnight-wine: #2B0404;
            --emperor-gold: #FBBF24;
            --warm-mandarine: #F97316;
            --alabaster: #FFFBEB;
            --gold-leaf: #FDE68A;
            --warm-taupe: #E7E5E4;
            --bg-primary: #450A0A;
            --bg-secondary: #2B0404;
            --text-primary: #FFFBEB;
            --text-secondary: #FDE68A;
            --text-body: #E7E5E4;
            --accent: #FBBF24;
            --accent-hover: #F59E0B;
            --border-subtle: rgba(245, 158, 11, 0.2);
            --border-gold: rgba(251, 191, 36, 0.4);
            --shadow-gold: 0 4px 20px rgba(245, 158, 11, 0.25);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            background-color: var(--bg-primary);
            color: var(--text-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }
        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }
        .site-header {
            background: rgba(43, 4, 4, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 1.5rem;
        }
        .nav-logo {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--emperor-gold);
            white-space: nowrap;
            letter-spacing: -0.02em;
        }
        .nav-logo:hover {
            color: var(--accent-hover);
        }
        .nav-links {
            display: none;
            align-items: center;
            gap: 0.25rem;
        }
        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
        }
        .nav-link {
            padding: 0.5rem 0.9rem;
            border-radius: 0.5rem;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-primary);
            position: relative;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--emperor-gold);
            background: rgba(245, 158, 11, 0.1);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .btn-login {
            padding: 0.45rem 1.1rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--gold-leaf);
            background: transparent;
            border: 1.5px solid var(--border-gold);
        }
        .btn-login:hover {
            background: rgba(245, 158, 11, 0.12);
            border-color: var(--accent);
        }
        .btn-signup {
            padding: 0.45rem 1.2rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 2px 10px rgba(245, 158, 11, 0.3);
        }
        .btn-signup:hover {
            box-shadow: 0 4px 18px rgba(245, 158, 11, 0.45);
            transform: translateY(-1px);
        }
        .mobile-menu-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 0.5rem;
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-primary);
            font-size: 1.25rem;
        }
        @media (min-width: 1024px) {
            .mobile-menu-btn {
                display: none;
            }
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: rgba(43, 4, 4, 0.98);
            backdrop-filter: blur(20px);
            padding: 1rem 1.5rem 1.5rem;
            gap: 0.4rem;
        }
        .mobile-nav.open {
            display: flex;
        }
        .mobile-nav .nav-link {
            padding: 0.7rem 1rem;
            border-radius: 0.5rem;
        }
        .article-hero {
            position: relative;
            padding: 3rem 0 2rem;
            background: linear-gradient(180deg, #2B0404 0%, #450A0A 100%);
            overflow: hidden;
            border-bottom: 1px solid var(--border-subtle);
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(251, 191, 36, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .article-hero-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
            align-items: center;
            position: relative;
            z-index: 1;
        }
        @media (min-width: 768px) {
            .article-hero-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2.5rem;
            }
        }
        .article-hero-tag {
            display: inline-block;
            padding: 0.35rem 0.9rem;
            border-radius: 999px;
            background: rgba(245, 158, 11, 0.15);
            color: var(--gold-leaf);
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 1rem;
            border: 1px solid var(--border-subtle);
        }
        .article-hero-title {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 2rem;
            line-height: 1.2;
            color: var(--alabaster);
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        @media (min-width: 768px) {
            .article-hero-title {
                font-size: 2.5rem;
            }
        }
        .article-hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            font-size: 0.85rem;
            color: var(--warm-taupe);
            margin-bottom: 1.25rem;
        }
        .article-hero-meta span {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
        }
        .article-hero-img {
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid var(--border-gold);
            box-shadow: var(--shadow-gold);
        }
        .article-main-layout {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
            padding: 2.5rem 0 2rem;
        }
        @media (min-width: 1024px) {
            .article-main-layout {
                grid-template-columns: 1fr 300px;
                gap: 2.5rem;
            }
        }
        .article-content {
            background: rgba(43, 4, 4, 0.55);
            backdrop-filter: blur(8px);
            border-radius: var(--radius-xl);
            padding: 2rem;
            border: 1px solid var(--border-subtle);
        }
        .article-content h2 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--alabaster);
            margin: 1.75rem 0 0.75rem;
            line-height: 1.3;
        }
        .article-content h3 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 600;
            font-size: 1.2rem;
            color: var(--gold-leaf);
            margin: 1.5rem 0 0.5rem;
        }
        .article-content p {
            margin-bottom: 1rem;
            line-height: 1.7;
        }
        .article-content ul, .article-content ol {
            margin: 1rem 0;
            padding-left: 1.25rem;
        }
        .article-content li {
            margin-bottom: 0.5rem;
            line-height: 1.6;
        }
        .article-content strong {
            color: var(--alabaster);
            font-weight: 600;
        }
        .article-content blockquote {
            border-left: 3px solid var(--accent);
            padding: 0.75rem 1.25rem;
            margin: 1.25rem 0;
            background: rgba(245, 158, 11, 0.06);
            border-radius: 0 0.5rem 0.5rem 0;
            color: var(--text-body);
            font-style: italic;
        }
        .article-content img {
            border-radius: var(--radius-lg);
            margin: 1.25rem 0;
            border: 1px solid var(--border-subtle);
        }
        .article-content a {
            color: var(--accent);
            border-bottom: 1px dashed var(--accent);
        }
        .article-content a:hover {
            color: var(--accent-hover);
            border-bottom-style: solid;
        }
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .sidebar-card {
            background: rgba(43, 4, 4, 0.55);
            backdrop-filter: blur(8px);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            border: 1px solid var(--border-subtle);
        }
        .sidebar-card h4 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--alabaster);
            margin-bottom: 0.75rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--border-subtle);
        }
        .sidebar-card ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .sidebar-card ul li a {
            display: block;
            padding: 0.5rem 0.75rem;
            border-radius: 0.5rem;
            font-size: 0.9rem;
            color: var(--text-body);
            transition: var(--transition-smooth);
        }
        .sidebar-card ul li a:hover {
            background: rgba(245, 158, 11, 0.1);
            color: var(--accent);
        }
        .download-card {
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            border-radius: var(--radius-xl);
            padding: 1.5rem;
            text-align: center;
            box-shadow: var(--shadow-gold);
        }
        .download-card h4 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.15rem;
            color: #2B0404;
            margin-bottom: 0.5rem;
            border: none;
            padding: 0;
        }
        .download-card p {
            font-size: 0.85rem;
            color: #450A0A;
            margin-bottom: 1rem;
            font-weight: 500;
        }
        .btn-download {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.65rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 700;
            font-size: 0.9rem;
            background: #2B0404;
            color: var(--alabaster);
            box-shadown: 0 2px 8px rgba(0,0,0,0.2);
        }
        .btn-download:hover {
            background: #450A0A;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(0,0,0,0.3);
        }
        .not-found-container {
            min-height: 50vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 3rem 1.5rem;
        }
        .not-found-container h2 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-size: 2rem;
            color: var(--gold-leaf);
            margin-bottom: 1rem;
        }
        .not-found-container p {
            color: var(--text-body);
            margin-bottom: 1.5rem;
        }
        .btn-back-home {
            padding: 0.6rem 1.8rem;
            border-radius: 0.5rem;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            color: #450A0A;
            font-weight: 700;
            font-size: 0.95rem;
        }
        .btn-back-home:hover {
            filter: brightness(1.1);
        }
        .site-footer {
            background: #1B0202;
            border-top: 1px solid var(--border-subtle);
            padding: 2.5rem 0 1.5rem;
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
            }
        }
        .footer-brand {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--emperor-gold);
            margin-bottom: 0.5rem;
        }
        .footer-desc {
            font-size: 0.875rem;
            color: var(--warm-taupe);
            line-height: 1.6;
        }
        .footer-heading {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            font-size: 1rem;
            color: var(--alabaster);
            margin-bottom: 0.75rem;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.45rem;
        }
        .footer-links li a {
            font-size: 0.875rem;
            color: var(--text-body);
        }
        .footer-links li a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 1.25rem;
            text-align: center;
            font-size: 0.8rem;
            color: var(--warm-taupe);
        }

/* roulang page: category1 */
:root {
            --royal-crimson: #450A0A;
            --midnight-wine: #2B0404;
            --emperor-gold: #FBBF24;
            --warm-mandarine: #F97316;
            --alabaster: #FFFBEB;
            --gold-leaf: #FDE68A;
            --warm-taupe: #E7E5E4;
            --bg-primary: #450A0A;
            --bg-secondary: #2B0404;
            --text-primary: #FFFBEB;
            --text-secondary: #FDE68A;
            --text-body: #E7E5E4;
            --accent: #FBBF24;
            --accent-hover: #F59E0B;
            --border-subtle: rgba(245, 158, 11, 0.2);
            --border-gold: rgba(251, 191, 36, 0.4);
            --shadow-gold: 0 4px 20px rgba(245, 158, 11, 0.25);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            background-color: var(--bg-primary);
            color: var(--text-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, .btn {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }
        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }
        /* Navigation */
        .site-header {
            background: rgba(43, 4, 4, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition-smooth);
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 1.5rem;
        }
        .nav-logo {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--emperor-gold);
            white-space: nowrap;
            letter-spacing: -0.02em;
            transition: var(--transition-smooth);
        }
        .nav-logo:hover {
            color: var(--accent-hover);
        }
        .nav-links {
            display: none;
            align-items: center;
            gap: 0.25rem;
        }
        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
        }
        .nav-link {
            padding: 0.5rem 0.9rem;
            border-radius: 0.5rem;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-primary);
            transition: var(--transition-smooth);
            position: relative;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--emperor-gold);
            background: rgba(245, 158, 11, 0.1);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .btn-login {
            padding: 0.45rem 1.1rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--gold-leaf);
            background: transparent;
            border: 1.5px solid var(--border-gold);
            transition: var(--transition-smooth);
            white-space: nowrap;
        }
        .btn-login:hover {
            background: rgba(245, 158, 11, 0.12);
            border-color: var(--accent);
        }
        .btn-signup {
            padding: 0.45rem 1.2rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 2px 10px rgba(245, 158, 11, 0.3);
            transition: var(--transition-smooth);
            white-space: nowrap;
        }
        .btn-signup:hover {
            box-shadow: 0 4px 18px rgba(245, 158, 11, 0.45);
            transform: translateY(-1px);
        }
        .mobile-menu-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 0.5rem;
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-primary);
            font-size: 1.25rem;
        }
        @media (min-width: 1024px) {
            .mobile-menu-btn {
                display: none;
            }
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: rgba(43, 4, 4, 0.98);
            backdrop-filter: blur(20px);
            padding: 1rem 1.5rem 1.5rem;
            gap: 0.4rem;
        }
        .mobile-nav.open {
            display: flex;
        }
        .mobile-nav .nav-link {
            padding: 0.7rem 1rem;
            border-radius: 0.5rem;
        }
        /* Shared Section Styles */
        .section-padding {
            padding: 3rem 0;
        }
        @media (min-width: 1024px) {
            .section-padding {
                padding: 4.5rem 0;
            }
        }
        .section-title {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            font-size: 1.75rem;
            color: var(--text-primary);
            margin-bottom: 0.75rem;
            letter-spacing: -0.01em;
        }
        @media (min-width: 1024px) {
            .section-title {
                font-size: 2.1rem;
            }
        }
        .section-subtitle {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-bottom: 2rem;
            font-weight: 500;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 1.8rem;
            border-radius: 0.75rem;
            font-weight: 700;
            font-size: 1rem;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 4px 18px rgba(245, 158, 11, 0.35);
            transition: var(--transition-smooth);
        }
        .btn-primary:hover {
            box-shadow: 0 6px 24px rgba(245, 158, 11, 0.5);
            transform: translateY(-2px);
        }
        .btn-outline-gold {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.6rem;
            border-radius: 0.75rem;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--emperor-gold);
            background: transparent;
            border: 2px solid var(--border-gold);
            transition: var(--transition-smooth);
        }
        .btn-outline-gold:hover {
            background: rgba(245, 158, 11, 0.1);
            border-color: var(--accent);
        }
        /* Hero */
        .hero-section {
            position: relative;
            background: linear-gradient(180deg, #2B0404 0%, #450A0A 100%);
            overflow: hidden;
            padding: 3rem 0 2rem;
        }
        @media (min-width: 1024px) {
            .hero-section {
                padding: 5rem 0 4rem;
            }
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2.5rem;
            align-items: center;
        }
        @media (min-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr 1fr;
                gap: 3rem;
            }
        }
        .hero-tag {
            display: inline-block;
            padding: 0.35rem 0.9rem;
            background: rgba(245, 158, 11, 0.15);
            border: 1px solid var(--border-gold);
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--emperor-gold);
            margin-bottom: 1.25rem;
            letter-spacing: 0.03em;
        }
        .hero-title {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 2.2rem;
            color: var(--alabaster);
            line-height: 1.25;
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        @media (min-width: 1024px) {
            .hero-title {
                font-size: 3rem;
            }
        }
        .hero-desc {
            font-size: 1.05rem;
            color: var(--warm-taupe);
            margin-bottom: 1.75rem;
            line-height: 1.7;
            max-width: 540px;
        }
        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            margin-bottom: 2rem;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.35rem 0.8rem;
            background: rgba(255, 251, 235, 0.05);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            font-size: 0.8rem;
            color: var(--text-primary);
            font-weight: 500;
        }
        .hero-badge i {
            color: var(--accent);
            font-size: 0.75rem;
        }
        .hero-visual {
            position: relative;
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid var(--border-gold);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        }
        /* Stats bar */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1rem;
            background: rgba(43, 4, 4, 0.7);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 1.25rem;
            backdrop-filter: blur(8px);
        }
        @media (min-width: 640px) {
            .stats-bar {
                grid-template-columns: repeat(4, 1fr);
                gap: 1.5rem;
                padding: 1.5rem 2rem;
            }
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--emperor-gold);
            line-height: 1.2;
        }
        @media (min-width: 1024px) {
            .stat-number {
                font-size: 1.8rem;
            }
        }
        .stat-label {
            font-size: 0.8rem;
            color: var(--warm-taupe);
            margin-top: 0.2rem;
        }
        /* Scenarios Grid */
        .scenario-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        @media (min-width: 640px) {
            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (min-width: 1024px) {
            .scenario-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        .scenario-card {
            background: rgba(43, 4, 4, 0.6);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 1.75rem;
            transition: var(--transition-smooth);
            backdrop-filter: blur(4px);
        }
        .scenario-card:hover {
            border-color: var(--border-gold);
            box-shadow: 0 6px 20px rgba(245, 158, 11, 0.15);
            transform: translateY(-3px);
        }
        .scenario-icon {
            font-size: 2rem;
            color: var(--emperor-gold);
            margin-bottom: 1rem;
        }
        .scenario-title {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            font-size: 1.15rem;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
        }
        .scenario-desc {
            font-size: 0.9rem;
            color: var(--warm-taupe);
            line-height: 1.6;
        }
        /* Process Steps */
        .process-list {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .process-item {
            display: flex;
            gap: 1.25rem;
            align-items: flex-start;
        }
        .process-num {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.2rem;
            color: #450A0A;
        }
        .process-content h4 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.25rem;
            font-size: 1.05rem;
        }
        .process-content p {
            color: var(--warm-taupe);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        /* Info Cards */
        .info-cards {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        @media (min-width: 640px) {
            .info-cards {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        .info-card {
            background: rgba(43, 4, 4, 0.5);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 2rem;
            transition: var(--transition-smooth);
        }
        .info-card:hover {
            border-color: var(--border-gold);
        }
        .info-card h3 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            color: var(--emperor-gold);
            margin-bottom: 0.75rem;
            font-size: 1.2rem;
        }
        .info-card p {
            color: var(--warm-taupe);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .faq-item {
            background: rgba(43, 4, 4, 0.5);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 1.25rem 1.5rem;
            cursor: pointer;
            transition: var(--transition-smooth);
        }
        .faq-item:hover {
            border-color: var(--border-gold);
        }
        .faq-item summary {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            color: var(--text-primary);
            font-size: 1rem;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary i {
            color: var(--emperor-gold);
            transition: transform 0.3s ease;
        }
        .faq-item[open] summary i {
            transform: rotate(180deg);
        }
        .faq-answer {
            margin-top: 0.75rem;
            color: var(--warm-taupe);
            font-size: 0.9rem;
            line-height: 1.6;
            padding-top: 0.75rem;
            border-top: 1px solid var(--border-subtle);
        }
        /* CTA Banner */
        .cta-banner {
            background: linear-gradient(135deg, #2B0404 0%, #450A0A 50%, #5c1a1a 100%);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-xl);
            padding: 2.5rem 2rem;
            text-align: center;
        }
        .cta-banner h2 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--alabaster);
            margin-bottom: 0.75rem;
        }
        @media (min-width: 1024px) {
            .cta-banner h2 {
                font-size: 2.2rem;
            }
        }
        .cta-banner p {
            color: var(--warm-taupe);
            font-size: 1rem;
            margin-bottom: 2rem;
        }
        /* Footer */
        .site-footer {
            background: var(--midnight-wine);
            border-top: 1px solid var(--border-subtle);
            padding: 2.5rem 0 1.5rem;
        }
        @media (min-width: 1024px) {
            .site-footer {
                padding: 3.5rem 0 1.5rem;
            }
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        @media (min-width: 640px) {
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
            }
        }
        .footer-brand {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--emperor-gold);
            margin-bottom: 0.75rem;
        }
        .footer-desc {
            font-size: 0.875rem;
            color: var(--warm-taupe);
            line-height: 1.6;
            margin-bottom: 1rem;
        }
        .footer-heading {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 1rem;
            font-size: 1rem;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .footer-links a {
            color: var(--warm-taupe);
            font-size: 0.875rem;
            transition: var(--transition-smooth);
        }
        .footer-links a:hover {
            color: var(--emperor-gold);
        }
        .footer-bottom {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-subtle);
            font-size: 0.8rem;
            color: var(--warm-taupe);
        }
        /* FAB */
        .fab {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, #2B0404 0%, #450A0A 100%);
            border: 2px solid var(--border-gold);
            box-shadow: 0 6px 25px rgba(245, 158, 11, 0.35);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--emperor-gold);
            font-size: 1.4rem;
            cursor: pointer;
            transition: var(--transition-smooth);
            animation: fab-breathe 3s ease-in-out infinite;
        }
        .fab:hover {
            transform: scale(1.1);
            box-shadow: 0 8px 30px rgba(245, 158, 11, 0.5);
        }
        @keyframes fab-breathe {
            0%, 100% { opacity: 0.8; transform: translateY(0); }
            50% { opacity: 1; transform: translateY(-4px); }
        }
        .fab-badge {
            position: absolute;
            top: -2px;
            right: -2px;
            width: 16px;
            height: 16px;
            background: #DC2626;
            border-radius: 50%;
            border: 2px solid white;
        }

/* roulang page: category2 */
:root {
            --royal-crimson: #450A0A;
            --midnight-wine: #2B0404;
            --emperor-gold: #FBBF24;
            --warm-mandarine: #F97316;
            --alabaster: #FFFBEB;
            --gold-leaf: #FDE68A;
            --warm-taupe: #E7E5E4;
            --bg-primary: #450A0A;
            --bg-secondary: #2B0404;
            --text-primary: #FFFBEB;
            --text-secondary: #FDE68A;
            --text-body: #E7E5E4;
            --accent: #FBBF24;
            --accent-hover: #F59E0B;
            --border-subtle: rgba(245, 158, 11, 0.2);
            --border-gold: rgba(251, 191, 36, 0.4);
            --shadow-gold: 0 4px 20px rgba(245, 158, 11, 0.25);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            background-color: var(--bg-primary);
            color: var(--text-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            margin: 0;
            padding: 0;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        /* Navigation */
        .site-header {
            background: rgba(43, 4, 4, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition-smooth);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 1.5rem;
        }

        .nav-logo {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--emperor-gold);
            white-space: nowrap;
            letter-spacing: -0.02em;
            transition: var(--transition-smooth);
        }

        .nav-logo:hover {
            color: var(--accent-hover);
        }

        .nav-links {
            display: none;
            align-items: center;
            gap: 0.25rem;
        }

        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
        }

        .nav-link {
            padding: 0.5rem 0.9rem;
            border-radius: 0.5rem;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-primary);
            transition: var(--transition-smooth);
            position: relative;
        }

        .nav-link:hover,
        .nav-link.active {
            color: var(--emperor-gold);
            background: rgba(245, 158, 11, 0.1);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }

        .btn-login {
            padding: 0.45rem 1.1rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--gold-leaf);
            background: transparent;
            border: 1.5px solid var(--border-gold);
            transition: var(--transition-smooth);
        }

        .btn-login:hover {
            background: rgba(245, 158, 11, 0.12);
            border-color: var(--accent);
        }

        .btn-signup {
            padding: 0.45rem 1.2rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 2px 10px rgba(245, 158, 11, 0.3);
            transition: var(--transition-smooth);
        }

        .btn-signup:hover {
            box-shadow: 0 4px 18px rgba(245, 158, 11, 0.45);
            transform: translateY(-1px);
        }

        .mobile-menu-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 0.5rem;
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-primary);
            font-size: 1.25rem;
        }

        @media (min-width: 1024px) {
            .mobile-menu-btn {
                display: none;
            }
        }

        .mobile-nav {
            display: none;
            flex-direction: column;
            background: rgba(43, 4, 4, 0.98);
            backdrop-filter: blur(20px);
            padding: 1rem 1.5rem 1.5rem;
            gap: 0.4rem;
        }

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

        .mobile-nav .nav-link {
            padding: 0.7rem 1rem;
            border-radius: 0.5rem;
        }

        /* Hero */
        .hero-section {
            position: relative;
            padding: 3rem 0 2.5rem;
            background: linear-gradient(180deg, #2B0404 0%, #450A0A 100%);
            overflow: hidden;
        }

        @media (min-width: 768px) {
            .hero-section {
                padding: 4.5rem 0 3.5rem;
            }
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2.5rem;
            align-items: center;
        }

        @media (min-width: 768px) {
            .hero-grid {
                grid-template-columns: 1fr 1fr;
                gap: 3rem;
            }
        }

        .hero-content h1 {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--alabaster);
            line-height: 1.25;
            margin: 0 0 1rem;
        }

        @media (min-width: 768px) {
            .hero-content h1 {
                font-size: 2.8rem;
            }
        }

        .hero-tag {
            display: inline-block;
            padding: 0.35rem 0.9rem;
            border-radius: 999px;
            background: rgba(220, 38, 38, 0.2);
            color: #FCA5A5;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            margin-bottom: 0.8rem;
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--warm-taupe);
            margin: 1rem 0 1.5rem;
            line-height: 1.7;
        }

        .hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hero-visual img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-gold);
            max-width: 90%;
            margin: 0 auto;
        }

        /* Section Styling */
        .section {
            padding: 3rem 0;
        }

        @media (min-width: 768px) {
            .section {
                padding: 4rem 0;
            }
        }

        .section-title {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 1.5rem;
            letter-spacing: -0.01em;
            text-align: left;
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 2.2rem;
            }
        }

        /* Steps Panel */
        .steps-panel {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
            margin-top: 2rem;
        }

        @media (min-width: 768px) {
            .steps-panel {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .steps-panel {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .step-card {
            background: rgba(43, 4, 4, 0.7);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 1.5rem 1.2rem;
            position: relative;
            transition: var(--transition-smooth);
            text-align: left;
        }

        .step-card:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-3px);
        }

        .step-number {
            font-family: 'Be Vietnam Pro', sans-serif;
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--emperor-gold);
            opacity: 0.25;
            position: absolute;
            top: 0.8rem;
            right: 1rem;
            line-height: 1;
        }

        .step-card h3 {
            font-family: 'Be Vietnam Pro', sans-serif;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 0.5rem;
        }

        .step-card p {
            font-size: 0.9rem;
            color: var(--warm-taupe);
            margin: 0;
            line-height: 1.6;
        }

        /* Feature Cards */
        .feature-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
            margin-top: 2rem;
        }

        @media (min-width: 768px) {
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .feature-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .feature-card {
            background: rgba(255, 251, 235, 0.03);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 1.8rem 1.5rem;
            transition: var(--transition-smooth);
            text-align: left;
        }

        .feature-card:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
        }

        .feature-icon {
            font-size: 2rem;
            color: var(--emperor-gold);
            margin-bottom: 1rem;
            display: block;
        }

        .feature-card h3 {
            font-family: 'Be Vietnam Pro', sans-serif;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 0.5rem;
        }

        .feature-card p {
            font-size: 0.9rem;
            color: var(--warm-taupe);
            margin: 0;
            line-height: 1.65;
        }

        /* Comparison Table */
        .compare-table-wrapper {
            overflow-x: auto;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-subtle);
            margin-top: 2rem;
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
            background: rgba(43, 4, 4, 0.4);
        }

        .compare-table th {
            background: rgba(43, 4, 4, 0.8);
            padding: 1rem 1.2rem;
            font-family: 'Be Vietnam Pro', sans-serif;
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--gold-leaf);
            text-align: left;
            border-bottom: 1px solid var(--border-gold);
        }

        .compare-table td {
            padding: 1rem 1.2rem;
            font-size: 0.9rem;
            color: var(--text-body);
            border-bottom: 1px solid var(--border-subtle);
        }

        .compare-table tr:last-child td {
            border-bottom: none;
        }

        .badge-ok {
            display: inline-block;
            padding: 0.2rem 0.7rem;
            border-radius: 999px;
            background: rgba(16, 185, 129, 0.15);
            color: #6EE7B7;
            font-size: 0.8rem;
            font-weight: 600;
        }

        .badge-no {
            display: inline-block;
            padding: 0.2rem 0.7rem;
            border-radius: 999px;
            background: rgba(239, 68, 68, 0.15);
            color: #FCA5A5;
            font-size: 0.8rem;
            font-weight: 600;
        }

        /* CTA Ribbon */
        .cta-ribbon {
            background: linear-gradient(135deg, #2B0404 0%, #450A0A 100%);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-xl);
            padding: 2.5rem 2rem;
            text-align: left;
            margin-top: 2rem;
        }

        @media (min-width: 768px) {
            .cta-ribbon {
                display: flex;
                align-items: center;
                justify-content: space-between;
                gap: 2rem;
            }
        }

        .cta-ribbon h3 {
            font-family: 'Be Vietnam Pro', sans-serif;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--alabaster);
            margin: 0 0 0.5rem;
        }

        .cta-ribbon p {
            font-size: 1rem;
            color: var(--warm-taupe);
            margin: 0;
        }

        .btn-cta-primary {
            display: inline-block;
            padding: 0.8rem 2rem;
            border-radius: 0.75rem;
            font-size: 1rem;
            font-weight: 700;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 4px 18px rgba(245, 158, 11, 0.35);
            transition: var(--transition-smooth);
            white-space: nowrap;
            margin-top: 1.5rem;
        }

        @media (min-width: 768px) {
            .cta-ribbon .btn-cta-primary {
                margin-top: 0;
            }
        }

        .btn-cta-primary:hover {
            box-shadow: 0 8px 28px rgba(245, 158, 11, 0.5);
            transform: translateY(-2px);
            color: #450A0A;
        }

        /* News Grid */
        .news-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
            margin-top: 2rem;
        }

        @media (min-width: 768px) {
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .news-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .news-card {
            background: rgba(255, 251, 235, 0.03);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition-smooth);
            text-align: left;
        }

        .news-card:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-3px);
        }

        .news-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }

        .news-card-body {
            padding: 1.2rem;
        }

        .news-card-body h4 {
            font-family: 'Be Vietnam Pro', sans-serif;
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 0.4rem;
            line-height: 1.4;
        }

        .news-card-body p {
            font-size: 0.85rem;
            color: var(--warm-taupe);
            margin: 0 0 0.8rem;
            line-height: 1.5;
        }

        .news-card-body .news-date {
            font-size: 0.75rem;
            color: var(--gold-leaf);
            font-weight: 600;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 2rem;
        }

        .faq-item {
            background: rgba(255, 251, 235, 0.03);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition-smooth);
        }

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

        .faq-question {
            padding: 1.2rem 1.5rem;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: 'Inter', sans-serif;
            transition: var(--transition-smooth);
        }

        .faq-question:hover {
            color: var(--gold-leaf);
        }

        .faq-answer {
            padding: 0 1.5rem 1.2rem;
            font-size: 0.9rem;
            color: var(--warm-taupe);
            line-height: 1.65;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        .faq-item.open .faq-question {
            color: var(--emperor-gold);
        }

        .faq-icon {
            transition: transform 0.3s;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        /* Footer */
        .site-footer {
            background: var(--midnight-wine);
            border-top: 1px solid var(--border-subtle);
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
            }
        }

        .footer-brand {
            font-family: 'Be Vietnam Pro', sans-serif;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--emperor-gold);
            margin-bottom: 0.5rem;
        }

        .footer-desc {
            font-size: 0.9rem;
            color: var(--warm-taupe);
            line-height: 1.6;
            margin: 0 0 0.8rem;
        }

        .footer-heading {
            font-family: 'Be Vietnam Pro', sans-serif;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
            margin: 0 0 0.8rem;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .footer-links a {
            font-size: 0.9rem;
            color: var(--warm-taupe);
            transition: var(--transition-smooth);
        }

        .footer-links a:hover {
            color: var(--emperor-gold);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            margin-top: 2rem;
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.85rem;
            color: var(--warm-taupe);
        }

        /* FAB */
        .fab {
            position: fixed;
            left: 1rem;
            bottom: 6rem;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, #450A0A 0%, #2B0404 100%);
            border: 2px solid var(--emperor-gold);
            box-shadow: 0 6px 25px rgba(245, 158, 11, 0.35);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--emperor-gold);
            font-size: 1.5rem;
            transition: var(--transition-smooth);
            opacity: 0.85;
            animation: fabBreathe 3s ease-in-out infinite;
        }

        .fab:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 8px 32px rgba(245, 158, 11, 0.5);
        }

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

        .fab-badge {
            position: absolute;
            top: -2px;
            right: -2px;
            width: 14px;
            height: 14px;
            background: #DC2626;
            border-radius: 50%;
            border: 2px solid #FFFBEB;
        }

        /* Utility */
        .text-gold {
            color: var(--emperor-gold);
        }
        .bg-dark-card {
            background: rgba(255, 251, 235, 0.03);
        }
        .mt-4 {
            margin-top: 2rem;
        }
        .mb-2 {
            margin-bottom: 1rem;
        }

/* roulang page: category3 */
:root {
            --royal-crimson: #450A0A;
            --midnight-wine: #2B0404;
            --emperor-gold: #FBBF24;
            --warm-mandarine: #F97316;
            --alabaster: #FFFBEB;
            --gold-leaf: #FDE68A;
            --warm-taupe: #E7E5E4;
            --bg-primary: #450A0A;
            --bg-secondary: #2B0404;
            --text-primary: #FFFBEB;
            --text-secondary: #FDE68A;
            --text-body: #E7E5E4;
            --accent: #FBBF24;
            --accent-hover: #F59E0B;
            --border-subtle: rgba(245, 158, 11, 0.2);
            --border-gold: rgba(251, 191, 36, 0.4);
            --shadow-gold: 0 4px 20px rgba(245, 158, 11, 0.25);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            background-color: var(--bg-primary);
            color: var(--text-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, .btn {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }
        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        @media (min-width: 1024px) {
            .container {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        /* Navigation */
        .site-header {
            background: rgba(43, 4, 4, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition-smooth);
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 1.5rem;
        }
        .nav-logo {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--emperor-gold);
            white-space: nowrap;
            letter-spacing: -0.02em;
            transition: var(--transition-smooth);
        }
        .nav-logo:hover {
            color: var(--accent-hover);
        }
        .nav-links {
            display: none;
            align-items: center;
            gap: 0.25rem;
        }
        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
        }
        .nav-link {
            padding: 0.5rem 0.9rem;
            border-radius: 0.5rem;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-primary);
            transition: var(--transition-smooth);
            position: relative;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--emperor-gold);
            background: rgba(245, 158, 11, 0.1);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .btn-login {
            padding: 0.45rem 1.1rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--gold-leaf);
            background: transparent;
            border: 1.5px solid var(--border-gold);
            transition: var(--transition-smooth);
        }
        .btn-login:hover {
            background: rgba(245, 158, 11, 0.12);
            border-color: var(--accent);
        }
        .btn-signup {
            padding: 0.45rem 1.2rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 2px 10px rgba(245, 158, 11, 0.3);
            transition: var(--transition-smooth);
        }
        .btn-signup:hover {
            box-shadow: 0 4px 18px rgba(245, 158, 11, 0.45);
            transform: translateY(-1px);
        }
        .mobile-menu-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 0.5rem;
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-primary);
            font-size: 1.25rem;
        }
        @media (min-width: 1024px) {
            .mobile-menu-btn {
                display: none;
            }
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: rgba(43, 4, 4, 0.98);
            backdrop-filter: blur(20px);
            padding: 1rem 1.5rem 1.5rem;
            gap: 0.4rem;
        }
        .mobile-nav.open {
            display: flex;
        }
        .mobile-nav .nav-link {
            padding: 0.7rem 1rem;
            border-radius: 0.5rem;
        }

        /* Category Page Common Styles */
        .page-banner {
            position: relative;
            padding: 3.5rem 0 2.5rem;
            background: linear-gradient(180deg, #2B0404 0%, #450A0A 100%);
            overflow: hidden;
        }
        @media (min-width: 768px) {
            .page-banner {
                padding: 4.5rem 0 3.5rem;
            }
        }
        .page-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(251, 191, 36, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }
        .section-block {
            padding: 3rem 0;
        }
        @media (min-width: 768px) {
            .section-block {
                padding: 4rem 0;
            }
        }
        .text-gradient-gold {
            background: linear-gradient(135deg, #FBBF24 0%, #FDE68A 50%, #FBBF24 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .card-gold-border {
            background: var(--bg-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            transition: var(--transition-smooth);
        }
        .card-gold-border:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-2px);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.8rem;
            border-radius: 0.6rem;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--royal-crimson);
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 2px 12px rgba(245, 158, 11, 0.3);
            transition: var(--transition-smooth);
        }
        .btn-primary:hover {
            box-shadow: 0 4px 20px rgba(245, 158, 11, 0.5);
            transform: translateY(-2px);
        }
        .btn-outline-gold {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.65rem 1.6rem;
            border-radius: 0.6rem;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--emperor-gold);
            border: 2px solid var(--border-gold);
            background: transparent;
            transition: var(--transition-smooth);
        }
        .btn-outline-gold:hover {
            background: rgba(245, 158, 11, 0.1);
            border-color: var(--accent);
        }
        .badge-gold {
            display: inline-block;
            padding: 0.3rem 0.8rem;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 700;
            background: rgba(245, 158, 11, 0.2);
            color: var(--emperor-gold);
            border: 1px solid var(--border-subtle);
        }

        /* Card grid */
        .card-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        @media (min-width: 640px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (min-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        .card-grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.25rem;
        }
        @media (min-width: 768px) {
            .card-grid-4 {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        /* Steps */
        .steps-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        @media (min-width: 768px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (min-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
            padding: 1.2rem 0;
        }
        .faq-question {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            transition: var(--transition-smooth);
        }
        .faq-question:hover {
            color: var(--emperor-gold);
        }
        .faq-answer {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-body);
    margin-top: 0.75rem;
    display: none;
}
.faq-item.open .faq-answer {
    display: block;
}
.faq-icon {
    font-size: 1.1rem;
    transition: transform 0.3s ease;
    color: var(--emperor-gold);
}
.faq-item.open .faq-icon {
    transform: rotate(45deg);
}

/* Site Footer */
.site-footer {
    background: #1A0202;
    border-top: 1px solid var(--border-subtle);
    padding: 3rem 0 1.5rem;
    margin-top: 3rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}
@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
}
.footer-brand {
    font-family: 'Be Vietnam Pro', system-ui, sans-serif;
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--emperor-gold);
    margin-bottom: 0.8rem;
}
.footer-desc {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--warm-taupe);
    margin-bottom: 1rem;
}
.footer-heading {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
    letter-spacing: -0.01em;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-links li {
    margin-bottom: 0.45rem;
}
.footer-links a {
    font-size: 0.88rem;
    color: var(--text-body);
    transition: var(--transition-smooth);
}
.footer-links a:hover {
    color: var(--emperor-gold);
    padding-left: 4px;
}
.footer-bottom {
    border-top: 1px solid rgba(245, 158, 11, 0.15);
    padding-top: 1.5rem;
    font-size: 0.8rem;
    color: rgba(231, 229, 228, 0.6);
    text-align: center;
}

/* FAB */
.floating-fab {
    position: fixed;
    left: 1rem;
    bottom: 6rem;
    z-index: 50;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, #2B0404 0%, #450A0A 100%);
    border: 2px solid var(--emperor-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--emperor-gold);
    font-size: 1.4rem;
    box-shadow: 0 6px 25px rgba(245, 158, 11, 0.35);
    cursor: pointer;
    transition: var(--transition-smooth);
    opacity: 0.85;
}
.floating-fab:hover {
    opacity: 1;
    transform: scale(1.05);
    box-shadow: 0 8px 30px rgba(245, 158, 11, 0.5);
}
.notification-dot {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 10px;
    height: 10px;
    background: #EF4444;
    border-radius: 50%;
    border: 2px solid var(--alabaster);
}

/* roulang page: category4 */
:root {
            --royal-crimson: #450A0A;
            --midnight-wine: #2B0404;
            --emperor-gold: #FBBF24;
            --warm-mandarine: #F97316;
            --alabaster: #FFFBEB;
            --gold-leaf: #FDE68A;
            --warm-taupe: #E7E5E4;
            --bg-primary: #450A0A;
            --bg-secondary: #2B0404;
            --text-primary: #FFFBEB;
            --text-secondary: #FDE68A;
            --text-body: #E7E5E4;
            --accent: #FBBF24;
            --accent-hover: #F59E0B;
            --border-subtle: rgba(245, 158, 11, 0.2);
            --border-gold: rgba(251, 191, 36, 0.4);
            --shadow-gold: 0 4px 20px rgba(245, 158, 11, 0.25);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            background-color: var(--bg-primary);
            color: var(--text-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, .btn {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }
        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 768px) {
            .container { padding-left: 2rem; padding-right: 2rem; }
        }
        @media (min-width: 1024px) {
            .container { padding-left: 2.5rem; padding-right: 2.5rem; }
        }
        .site-header {
            background: rgba(43, 4, 4, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition-smooth);
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 1.5rem;
        }
        .nav-logo {
            font-family: 'Be Vietnam Pro', system-ui, sans-serif;
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--emperor-gold);
            white-space: nowrap;
            letter-spacing: -0.02em;
            transition: var(--transition-smooth);
        }
        .nav-logo:hover { color: var(--accent-hover); }
        .nav-links {
            display: none;
            align-items: center;
            gap: 0.25rem;
        }
        @media (min-width: 1024px) {
            .nav-links { display: flex; }
        }
        .nav-link {
            padding: 0.5rem 0.9rem;
            border-radius: 0.5rem;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-primary);
            transition: var(--transition-smooth);
            position: relative;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--emperor-gold);
            background: rgba(245, 158, 11, 0.1);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .btn-login {
            padding: 0.45rem 1.1rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--gold-leaf);
            background: transparent;
            border: 1.5px solid var(--border-gold);
            transition: var(--transition-smooth);
        }
        .btn-login:hover {
            background: rgba(245, 158, 11, 0.12);
            border-color: var(--accent);
        }
        .btn-signup {
            padding: 0.45rem 1.2rem;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: #450A0A;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            box-shadow: 0 2px 10px rgba(245, 158, 11, 0.3);
            transition: var(--transition-smooth);
        }
        .btn-signup:hover {
            box-shadow: 0 4px 18px rgba(245, 158, 11, 0.45);
            transform: translateY(-1px);
        }
        .mobile-menu-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 0.5rem;
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-primary);
            font-size: 1.25rem;
        }
        @media (min-width: 1024px) {
            .mobile-menu-btn { display: none; }
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: rgba(43, 4, 4, 0.98);
            backdrop-filter: blur(20px);
            padding: 1rem 1.5rem 1.5rem;
            gap: 0.4rem;
        }
        .mobile-nav.open { display: flex; }
        .mobile-nav .nav-link {
            padding: 0.7rem 1rem;
            border-radius: 0.5rem;
        }
        .hero-video-section {
            position: relative;
            min-height: 420px;
            background: linear-gradient(180deg, #2B0404 0%, #1A0202 100%);
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-video-overlay {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.jpg') center/cover no-repeat;
            filter: brightness(0.45);
            z-index: 0;
        }
        .hero-video-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 3rem 1.5rem;
        }
        .play-btn-circle {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            box-shadow: 0 0 35px rgba(245, 158, 11, 0.45);
            transition: var(--transition-smooth);
            cursor: pointer;
            font-size: 2rem;
            color: #450A0A;
        }
        .play-btn-circle:hover {
            transform: scale(1.08);
            box-shadow: 0 0 50px rgba(245, 158, 11, 0.6);
        }
        .section-spacing {
            padding: 3.5rem 0;
        }
        @media (min-width: 768px) {
            .section-spacing { padding: 5rem 0; }
        }
        .section-label {
            display: inline-block;
            padding: 0.35rem 0.9rem;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 700;
            background: rgba(245, 158, 11, 0.12);
            color: var(--emperor-gold);
            text-transform: uppercase;
            letter-spacing: 0.04em;
            margin-bottom: 0.8rem;
        }
        .card-gold {
            background: rgba(255, 251, 235, 0.03);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 2rem;
            transition: var(--transition-smooth);
        }
        .card-gold:hover {
            border-color: var(--border-gold);
            box-shadow: var(--shadow-gold);
            transform: translateY(-2px);
        }
        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, #FBBF24 0%, #F97316 100%);
            color: #450A0A;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.35rem;
            flex-shrink: 0;
        }
        .data-badge {
            background: rgba(245, 158, 11, 0.1);
            border: 1px solid var(--border-gold);
            border-radius: var(--radius-lg);
            padding: 1.25rem;
            text-align: center;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            background: none;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 1.05rem;
            padding: 1.2rem 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition-smooth);
        }
        .faq-question:hover { color: var(--emperor-gold); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            color: var(--warm-taupe);
            line-height: 1.7;
        }
        .faq-answer.open { max-height: 300px; padding-bottom: 1.2rem; }
        .site-footer {
            background: var(--midnight-wine);
            border-top: 2px solid var(--border-gold);
            padding: 3rem 0 2rem;
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        @media (min-width: 768px) {
            .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
        }
        .footer-brand {
            font-family: 'Be Vietnam Pro', sans-serif;
            font-weight: 800;
            font-size: 1.25rem;
            color: var(--emperor-gold);
            margin-bottom: 0.8rem;
        }
        .footer-desc {
            color: var(--warm-taupe);
            font-size: 0.9rem;
            line-height: 1.7;
            margin-bottom: 1rem;
        }
        .footer-heading {
            color: var(--gold-leaf);
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 0.9rem;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .footer-links a {
            color: var(--warm-taupe);
            font-size: 0.9rem;
            transition: var(--transition-smooth);
        }
        .footer-links a:hover { color: var(--emperor-gold); }
        .footer-bottom {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-subtle);
            text-align: center;
            color: var(--warm-taupe);
            font-size: 0.85rem;
        }