/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --primary-soft: #334155;
            --accent: #f59e0b;
            --accent-hover: #d97706;
            --accent-glow: rgba(245, 158, 11, 0.15);
            --blue-accent: #3b82f6;
            --blue-hover: #2563eb;
            --bg: #f8fafc;
            --bg-alt: #f1f5f9;
            --bg-card: #ffffff;
            --bg-dark: #0b1120;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-inverse: #f8fafc;
            --text-accent: #f59e0b;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
            --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.07);
            --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.10);
            --shadow-xl: 0 24px 48px rgba(15, 23, 42, 0.12);
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-width: 270px;
            --header-height: 0px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1280px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--bg);
            display: flex;
            min-height: 100vh;
        }

        a {
            color: var(--blue-accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--blue-hover);
        }
        a:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

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

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
        }

        h1 {
            font-size: clamp(2.2rem, 5vw, 3.8rem);
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2.5vw, 1.6rem);
        }
        h4 {
            font-size: 1.1rem;
        }

        p {
            color: var(--text-secondary);
            margin-bottom: 0.8rem;
        }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 32px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Left Sidebar Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: var(--primary);
            color: var(--text-inverse);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.2);
        }

        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .sidebar-brand .brand-icon {
            width: 42px;
            height: 42px;
            background: var(--accent);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            font-weight: 800;
            flex-shrink: 0;
        }

        .sidebar-brand .brand-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-inverse);
            letter-spacing: 0.5px;
        }
        .sidebar-brand .brand-text small {
            font-size: 0.7rem;
            font-weight: 400;
            opacity: 0.6;
            display: block;
            margin-top: 1px;
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
        }

        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: rgba(255, 255, 255, 0.3);
            padding: 12px 12px 6px;
            font-weight: 600;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-md);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            margin-bottom: 2px;
            text-decoration: none;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.4);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-inverse);
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: rgba(245, 158, 11, 0.15);
            color: var(--accent);
        }
        .sidebar-nav a.active i {
            color: var(--accent);
        }
        .sidebar-nav a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .sidebar-footer {
            padding: 20px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.3);
        }

        /* ===== Mobile Header (hidden on desktop) ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: var(--primary);
            z-index: 999;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
        }
        .mobile-header .mobile-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-inverse);
            font-weight: 700;
            font-size: 1.1rem;
        }
        .mobile-header .mobile-brand .brand-icon {
            width: 34px;
            height: 34px;
            background: var(--accent);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--primary);
            font-weight: 800;
        }
        .mobile-hamburger {
            width: 40px;
            height: 40px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            color: var(--text-inverse);
            font-size: 1.4rem;
        }
        .mobile-hamburger:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Main Content ===== */
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            padding: 100px 0 120px;
            background: var(--primary);
            overflow: hidden;
            min-height: 620px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            z-index: 0;
        }
        .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(15, 23, 42, 0.60) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent-glow);
            color: var(--accent);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 6px 18px;
            border-radius: 50px;
            margin-bottom: 24px;
            border: 1px solid rgba(245, 158, 11, 0.2);
            backdrop-filter: blur(4px);
        }
        .hero-badge i {
            font-size: 0.9rem;
        }
        .hero h1 {
            color: var(--text-inverse);
            max-width: 720px;
            margin-bottom: 20px;
            line-height: 1.15;
        }
        .hero h1 span {
            color: var(--accent);
        }
        .hero p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.15rem;
            max-width: 600px;
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 56px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }
        .hero-stats .stat-item {
            text-align: left;
        }
        .hero-stats .stat-number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-inverse);
            line-height: 1.2;
        }
        .hero-stats .stat-number span {
            color: var(--accent);
        }
        .hero-stats .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 4px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            text-decoration: none;
            border: 2px solid transparent;
            cursor: pointer;
            line-height: 1.2;
        }
        .btn:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 3px;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary);
            border-color: var(--accent);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-inverse);
            border-color: rgba(255, 255, 255, 0.3);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.15);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-ghost {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-inverse);
            border-color: transparent;
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.15);
            color: var(--text-inverse);
            transform: translateY(-2px);
        }
        .btn-ghost:active {
            transform: translateY(0);
        }
        .btn-sm {
            padding: 10px 20px;
            font-size: 0.875rem;
            border-radius: var(--radius-sm);
        }
        .btn-lg {
            padding: 18px 40px;
            font-size: 1.1rem;
        }

        /* ===== Section ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-inverse);
        }
        .section-dark h2,
        .section-dark h3 {
            color: var(--text-inverse);
        }
        .section-dark p {
            color: rgba(255, 255, 255, 0.7);
        }

        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 56px;
        }
        .section-header h2 {
            margin-bottom: 16px;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-muted);
        }
        .section-header .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent);
            background: var(--accent-glow);
            padding: 4px 16px;
            border-radius: 50px;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--accent);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 24px;
        }
        .card-body h3 {
            margin-bottom: 8px;
        }
        .card-body p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            margin-bottom: 0;
        }
        .card-body .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--blue-accent);
            background: rgba(59, 130, 246, 0.08);
            padding: 3px 12px;
            border-radius: 50px;
            margin-bottom: 10px;
        }
        .card-body .card-footer-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 14px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--accent);
        }
        .card-body .card-footer-link i {
            transition: var(--transition);
            font-size: 0.8rem;
        }
        .card-body .card-footer-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Grid ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 24px;
        }

        /* ===== Features / Highlights ===== */
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            border: 1px solid var(--border);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--accent);
        }
        .feature-card .icon-box {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: var(--accent-glow);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--accent);
            transition: var(--transition);
        }
        .feature-card:hover .icon-box {
            background: var(--accent);
            color: var(--primary);
        }
        .feature-card h3 {
            margin-bottom: 10px;
            font-size: 1.15rem;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* ===== Category Entry ===== */
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border);
            transition: var(--transition);
            display: block;
            text-decoration: none;
            color: inherit;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--accent);
        }
        .category-card img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
        }
        .category-card .cat-overlay {
            padding: 20px 24px 24px;
        }
        .category-card .cat-overlay h3 {
            font-size: 1.2rem;
            margin-bottom: 6px;
        }
        .category-card .cat-overlay p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .category-card .cat-arrow {
            position: absolute;
            top: 20px;
            right: 20px;
            width: 40px;
            height: 40px;
            background: var(--accent);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            transition: var(--transition);
            opacity: 0;
            transform: translateX(-10px);
        }
        .category-card:hover .cat-arrow {
            opacity: 1;
            transform: translateX(0);
        }

        /* ===== CMS List ===== */
        .cms-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .cms-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            background: var(--bg-card);
            padding: 20px 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .cms-item:hover {
            box-shadow: var(--shadow-sm);
            border-color: var(--accent);
            transform: translateX(4px);
        }
        .cms-item .cms-icon {
            width: 44px;
            height: 44px;
            flex-shrink: 0;
            background: var(--accent-glow);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 1.2rem;
        }
        .cms-item .cms-content {
            flex: 1;
            min-width: 0;
        }
        .cms-item .cms-content h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
            color: var(--text-primary);
        }
        .cms-item .cms-content h4 a {
            color: var(--text-primary);
            text-decoration: none;
        }
        .cms-item .cms-content h4 a:hover {
            color: var(--accent);
        }
        .cms-item .cms-content .cms-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .cms-item .cms-content .cms-meta .cms-cat {
            background: rgba(59, 130, 246, 0.08);
            color: var(--blue-accent);
            padding: 2px 10px;
            border-radius: 50px;
            font-weight: 500;
        }
        .cms-item .cms-content .cms-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
            margin-top: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .cms-empty {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 1rem;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border);
        }
        .cms-empty i {
            font-size: 2rem;
            display: block;
            margin-bottom: 12px;
            opacity: 0.4;
        }

        /* ===== Steps / Process ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .step-card .step-num {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            background: var(--accent);
            color: var(--primary);
            font-weight: 800;
            font-size: 1.2rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .step-card h4 {
            margin-bottom: 8px;
            font-size: 1.05rem;
        }
        .step-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border);
            padding: 20px 0;
        }
        .faq-item:first-child {
            padding-top: 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-primary);
            transition: var(--transition);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            padding: 4px 0;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question i {
            color: var(--text-muted);
            transition: var(--transition);
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 16px 0 4px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            color: var(--text-inverse);
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 36px;
            font-size: 1.05rem;
        }
        .cta-section .btn-primary {
            font-size: 1.1rem;
            padding: 16px 40px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.6);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .site-footer .footer-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-inverse);
            margin-bottom: 12px;
        }
        .site-footer .footer-brand .brand-icon {
            width: 36px;
            height: 36px;
            background: var(--accent);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--primary);
            font-weight: 800;
        }
        .site-footer p {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.5);
            max-width: 360px;
        }
        .site-footer h4 {
            color: var(--text-inverse);
            font-size: 0.95rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .site-footer ul li {
            margin-bottom: 8px;
        }
        .site-footer ul li a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.88rem;
            text-decoration: none;
            transition: var(--transition);
        }
        .site-footer ul li a:hover {
            color: var(--accent);
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.3);
        }
        .site-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.3);
        }
        .site-footer .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 50px;
            background: var(--accent-glow);
            color: var(--accent);
        }
        .badge-blue {
            background: rgba(59, 130, 246, 0.08);
            color: var(--blue-accent);
        }
        .badge-green {
            background: rgba(16, 185, 129, 0.08);
            color: #10b981;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: 64px;
            }
            .hero {
                padding: 60px 0 80px;
                min-height: auto;
            }
            .hero h1 {
                font-size: clamp(1.8rem, 6vw, 2.6rem);
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 24px;
                flex-wrap: wrap;
                margin-top: 36px;
                padding-top: 24px;
            }
            .hero-stats .stat-number {
                font-size: 1.6rem;
            }
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .grid-4 {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .section {
                padding: 56px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .cms-item {
                flex-direction: column;
                gap: 12px;
                padding: 16px 18px;
            }
            .cms-item .cms-icon {
                width: 36px;
                height: 36px;
                font-size: 1rem;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .feature-card {
                padding: 28px 20px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero {
                padding: 40px 0 60px;
            }
            .hero-stats .stat-number {
                font-size: 1.3rem;
            }
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
            .section {
                padding: 40px 0;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                text-align: center;
                justify-content: center;
            }
            .category-card .cat-arrow {
                opacity: 1;
                transform: translateX(0);
                top: 16px;
                right: 16px;
                width: 34px;
                height: 34px;
                font-size: 0.85rem;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .rounded-full {
            border-radius: 50%;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        /* ===== Overlay for mobile ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
            backdrop-filter: blur(2px);
        }
        .sidebar-overlay.show {
            display: block;
        }

        @media (max-width: 768px) {
            .sidebar-overlay.show {
                display: block;
            }
        }

        /* Smooth scroll offset for anchor links */
        .scroll-offset {
            scroll-margin-top: 80px;
        }

/* roulang page: category1 */
/* ===== DESIGN TOKENS ===== */
        :root {
            --primary: #6c5ce7;
            --primary-light: #a29bfe;
            --primary-dark: #4a3db8;
            --secondary: #fd79a8;
            --accent: #00cec9;
            --bg: #f8f9ff;
            --bg-card: #ffffff;
            --bg-dark: #1a1a2e;
            --bg-dark2: #16213e;
            --text: #2d3436;
            --text-light: #636e72;
            --text-lighter: #b2bec3;
            --text-white: #f5f6fa;
            --border: #e8e8f0;
            --border-light: #f0f0f8;
            --shadow-sm: 0 2px 8px rgba(108, 92, 231, 0.06);
            --shadow-md: 0 8px 30px rgba(108, 92, 231, 0.10);
            --shadow-lg: 0 20px 60px rgba(108, 92, 231, 0.15);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --sidebar-width: 240px;
            --header-height: 0px;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== RESET & BASE ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            display: flex;
            min-height: 100vh;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: var(--font);
            font-size: 1rem;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
            padding: 0;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 600;
            color: var(--text);
        }
        p {
            color: var(--text-light);
            margin-bottom: 0.5rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== SIDEBAR (App Shell) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-card);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform 0.3s ease;
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.04);
        }
        .sidebar-brand {
            padding: 28px 20px 20px;
            display: flex;
            align-items: center;
            gap: 14px;
            border-bottom: 1px solid var(--border-light);
        }
        .brand-icon {
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.3rem;
            color: #fff;
            flex-shrink: 0;
        }
        .brand-text {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text);
            line-height: 1.2;
        }
        .brand-text small {
            display: block;
            font-weight: 400;
            font-size: 0.75rem;
            color: var(--text-light);
            letter-spacing: 0.3px;
        }
        .sidebar-nav {
            flex: 1;
            padding: 20px 16px;
            display: flex;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }
        .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: var(--text-lighter);
            padding: 8px 12px 6px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            transition: var(--transition);
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1.1rem;
            color: var(--text-lighter);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(108, 92, 231, 0.06);
            color: var(--primary);
        }
        .sidebar-nav a:hover i {
            color: var(--primary);
        }
        .sidebar-nav a.active {
            background: rgba(108, 92, 231, 0.10);
            color: var(--primary);
            font-weight: 600;
        }
        .sidebar-nav a.active i {
            color: var(--primary);
        }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-light);
            font-size: 0.75rem;
            color: var(--text-lighter);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }
        .sidebar-footer i {
            font-size: 0.7rem;
        }

        /* ===== MOBILE HEADER (hidden on desktop) ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: var(--bg-card);
            border-bottom: 1px solid var(--border);
            z-index: 999;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .mobile-header .brand-icon {
            width: 34px;
            height: 34px;
            font-size: 1rem;
        }
        .mobile-header .brand-text {
            font-size: 1rem;
        }
        .mobile-menu-btn {
            background: none;
            font-size: 1.5rem;
            color: var(--text);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
        }
        .mobile-menu-btn:hover {
            background: rgba(108, 92, 231, 0.06);
        }
        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.3);
            z-index: 998;
            backdrop-filter: blur(4px);
        }

        /* ===== MAIN CONTENT ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .page-content {
            flex: 1;
        }

        /* ===== BANNER / HERO (category header) ===== */
        .category-banner {
            position: relative;
            padding: 80px 0 60px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-dark2) 100%);
            overflow: hidden;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .category-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, var(--bg), transparent);
            z-index: 1;
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
        }
        .category-banner h1 {
            font-size: 2.8rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .category-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 680px;
            line-height: 1.8;
        }
        .category-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 24px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .category-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.65);
        }
        .category-banner .breadcrumb a:hover {
            color: var(--primary-light);
        }
        .category-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.85);
        }

        /* ===== SECTION COMMON ===== */
        .section {
            padding: 70px 0;
        }
        .section-alt {
            background: var(--bg-card);
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-header .badge {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 20px;
            background: rgba(108, 92, 231, 0.10);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }

        /* ===== CARDS ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 22px 24px 24px;
        }
        .card-body h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text);
        }
        .card-body p {
            font-size: 0.92rem;
            color: var(--text-light);
            line-height: 1.7;
        }
        .card-body .tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 14px;
        }
        .card-body .tag {
            padding: 3px 12px;
            border-radius: 14px;
            background: rgba(108, 92, 231, 0.07);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 500;
        }
        .card-footer-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9rem;
            margin-top: 14px;
            transition: var(--transition);
        }
        .card-footer-link i {
            transition: transform 0.2s;
        }
        .card-footer-link:hover i {
            transform: translateX(4px);
        }

        /* ===== GRID ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        /* ===== BUTTONS ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: 0 4px 16px rgba(108, 92, 231, 0.30);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(108, 92, 231, 0.40);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
        }
        .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }

        /* ===== FEATURES / ICON BLOCKS ===== */
        .feature-card {
            text-align: center;
            padding: 36px 24px 32px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }
        .feature-card .icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: rgba(108, 92, 231, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .feature-card:hover .icon {
            background: var(--primary);
            color: #fff;
        }
        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ===== LIST / GUIDE ITEMS ===== */
        .guide-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .guide-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .guide-item:hover {
            box-shadow: var(--shadow-sm);
            border-color: var(--primary-light);
        }
        .guide-item .num {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(108, 92, 231, 0.10);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
            font-size: 1.1rem;
        }
        .guide-item .content h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .guide-item .content p {
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .guide-item .badge {
            flex-shrink: 0;
            padding: 4px 14px;
            border-radius: 14px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(0, 206, 201, 0.10);
            color: var(--accent);
            align-self: center;
        }
        .guide-item .badge.hot {
            background: rgba(253, 121, 168, 0.10);
            color: var(--secondary);
        }
        .guide-item .badge.new {
            background: rgba(108, 92, 231, 0.10);
            color: var(--primary);
        }

        /* ===== STATS ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            text-align: center;
            padding: 32px 16px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
        }
        .stat-card .num {
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-card .label {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 6px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            border: none;
        }
        .faq-question i {
            transition: transform 0.3s;
            color: var(--text-lighter);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA SECTION ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--bg-dark), var(--bg-dark2));
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== FOOTER ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 32px;
            font-size: 0.9rem;
        }
        .site-footer .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 16px;
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-white);
        }
        .footer-brand .brand-icon {
            width: 38px;
            height: 38px;
            font-size: 1.1rem;
        }
        .site-footer p {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.9rem;
            line-height: 1.8;
            max-width: 360px;
        }
        .site-footer h4 {
            color: var(--text-white);
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .site-footer ul li {
            margin-bottom: 10px;
        }
        .site-footer ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.9rem;
        }
        .site-footer ul li a:hover {
            color: var(--primary-light);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .mobile-overlay.active {
                display: block;
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: 60px;
            }
            .category-banner {
                padding: 48px 0 40px;
            }
            .category-banner h1 {
                font-size: 1.8rem;
            }
            .category-banner p {
                font-size: 1rem;
            }
            .section {
                padding: 48px 0;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .grid-4 {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-card .num {
                font-size: 1.8rem;
            }
            .guide-item {
                flex-direction: column;
                gap: 12px;
                padding: 16px 18px;
            }
            .guide-item .badge {
                align-self: flex-start;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .cta-actions {
                flex-direction: column;
                align-items: center;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .feature-card {
                padding: 28px 18px 24px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-banner h1 {
                font-size: 1.5rem;
            }
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 20px 12px;
            }
            .stat-card .num {
                font-size: 1.5rem;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
                width: 100%;
                justify-content: center;
            }
            .section-header h2 {
                font-size: 1.4rem;
            }
            .card-body {
                padding: 16px 18px 18px;
            }
            .guide-item .num {
                width: 32px;
                height: 32px;
                font-size: 0.9rem;
            }
        }

        /* ===== ACCESSIBILITY ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }

        /* ===== SCROLLBAR ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--text-lighter);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-light);
        }

        /* ===== SKIP LINK ===== */
        .skip-link {
            position: absolute;
            top: -100px;
            left: 8px;
            background: var(--primary);
            color: #fff;
            padding: 8px 16px;
            border-radius: 0 0 8px 8px;
            z-index: 9999;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .skip-link:focus {
            top: 0;
        }

        /* ===== ANIMATIONS ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-up {
            animation: fadeUp 0.6s ease forwards;
        }
        .delay-1 {
            animation-delay: 0.1s;
        }
        .delay-2 {
            animation-delay: 0.2s;
        }
        .delay-3 {
            animation-delay: 0.3s;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
    :root {
        --primary: #4F46E5;
        --primary-hover: #4338CA;
        --primary-light: #EEF2FF;
        --secondary: #10B981;
        --secondary-hover: #059669;
        --accent: #F59E0B;
        --bg-body: #F8FAFC;
        --bg-card: #FFFFFF;
        --bg-sidebar: #0F172A;
        --bg-sidebar-hover: #1E293B;
        --bg-sidebar-active: #4F46E5;
        --text-primary: #1E293B;
        --text-secondary: #64748B;
        --text-light: #94A3B8;
        --text-white: #F8FAFC;
        --text-sidebar: #CBD5E1;
        --border: #E2E8F0;
        --border-light: #F1F5F9;
        --radius-sm: 6px;
        --radius-md: 10px;
        --radius-lg: 16px;
        --radius-xl: 20px;
        --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
        --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
        --shadow-lg: 0 10px 30px rgba(0,0,0,0.08);
        --shadow-xl: 0 20px 50px rgba(0,0,0,0.12);
        --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        --sidebar-width: 240px;
        --header-height: 64px;
        --max-width: 1200px;
        --content-max-width: 860px;
    }

    /* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
    body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
        font-size: 16px; line-height: 1.7; color: var(--text-primary); background: var(--bg-body);
        display: flex; min-height: 100vh;
    }
    a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
    a:hover { color: var(--primary-hover); }
    a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
    button, input, textarea { font-family: inherit; font-size: inherit; }
    button { cursor: pointer; border: none; background: none; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
    h1 { font-size: 2.25rem; letter-spacing: -0.01em; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.35rem; }
    h4 { font-size: 1.1rem; }
    p { margin-bottom: 1rem; color: var(--text-secondary); }
    p:last-child { margin-bottom: 0; }

    /* ===== Container ===== */
    .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
    .container-narrow { max-width: var(--content-max-width); margin: 0 auto; padding: 0 24px; }

    /* ===== Sidebar (Desktop) ===== */
    .sidebar {
        position: fixed; top: 0; left: 0; width: var(--sidebar-width); height: 100vh; z-index: 1000;
        background: var(--bg-sidebar); display: flex; flex-direction: column;
        border-right: 1px solid rgba(255,255,255,0.06); overflow-y: auto;
        transition: transform var(--transition);
    }
    .sidebar-brand {
        display: flex; align-items: center; gap: 12px; padding: 24px 20px 20px;
        border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .brand-icon {
        width: 40px; height: 40px; border-radius: var(--radius-md);
        background: linear-gradient(135deg, var(--primary), #818CF8);
        display: flex; align-items: center; justify-content: center;
        font-size: 1.2rem; font-weight: 800; color: #fff; flex-shrink: 0;
    }
    .brand-text { color: var(--text-white); font-weight: 700; font-size: 1.15rem; line-height: 1.3; }
    .brand-text small { display: block; font-weight: 400; font-size: 0.75rem; color: var(--text-light); margin-top: 2px; }
    .sidebar-nav { flex: 1; padding: 16px 12px; display: flex; flex-direction: column; gap: 2px; }
    .nav-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-light); padding: 8px 12px 6px; font-weight: 600; }
    .sidebar-nav a {
        display: flex; align-items: center; gap: 12px; padding: 10px 14px; border-radius: var(--radius-md);
        color: var(--text-sidebar); font-weight: 500; font-size: 0.92rem;
        transition: all var(--transition); position: relative;
    }
    .sidebar-nav a i { width: 20px; text-align: center; font-size: 1rem; color: var(--text-light); transition: color var(--transition); }
    .sidebar-nav a:hover { background: var(--bg-sidebar-hover); color: #fff; }
    .sidebar-nav a:hover i { color: #fff; }
    .sidebar-nav a.active, .sidebar-nav a[aria-current="page"] { background: var(--bg-sidebar-active); color: #fff; }
    .sidebar-nav a.active i, .sidebar-nav a[aria-current="page"] i { color: #fff; }
    .sidebar-footer {
        padding: 16px 20px; border-top: 1px solid rgba(255,255,255,0.06);
        font-size: 0.75rem; color: var(--text-light); text-align: center; line-height: 1.6;
    }
    .sidebar-footer i { margin-right: 4px; }

    /* ===== Mobile Header ===== */
    .mobile-header {
        display: none; position: fixed; top: 0; left: 0; right: 0; z-index: 999;
        height: var(--header-height); background: var(--bg-sidebar);
        padding: 0 20px; align-items: center; justify-content: space-between;
        border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .mobile-header .brand-text { font-size: 1rem; }
    .mobile-header .brand-text small { display: none; }
    .mobile-toggle {
        width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
        color: var(--text-white); font-size: 1.3rem; border-radius: var(--radius-sm);
        transition: background var(--transition);
    }
    .mobile-toggle:hover { background: var(--bg-sidebar-hover); }
    .sidebar-overlay {
        display: none; position: fixed; inset: 0; z-index: 998;
        background: rgba(0,0,0,0.5); backdrop-filter: blur(4px);
    }
    .sidebar-overlay.open { display: block; }

    /* ===== Main Content ===== */
    .main-content {
        flex: 1; margin-left: var(--sidebar-width); min-height: 100vh;
        display: flex; flex-direction: column;
    }
    .page-wrap { flex: 1; padding-top: 0; }

    /* ===== Article Header ===== */
    .article-header {
        background: var(--bg-card); border-bottom: 1px solid var(--border);
        padding: 48px 0 32px;
    }
    .article-header .breadcrumb {
        display: flex; align-items: center; gap: 8px; font-size: 0.85rem;
        color: var(--text-light); margin-bottom: 20px; flex-wrap: wrap;
    }
    .article-header .breadcrumb a { color: var(--text-secondary); }
    .article-header .breadcrumb a:hover { color: var(--primary); }
    .article-header .breadcrumb .sep { color: var(--text-light); }
    .article-header .breadcrumb .current { color: var(--text-primary); font-weight: 500; }
    .article-header h1 {
        font-size: 2.4rem; font-weight: 800; line-height: 1.25;
        color: var(--text-primary); margin-bottom: 16px; letter-spacing: -0.02em;
    }
    .article-meta {
        display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
        font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 24px;
    }
    .article-meta .category {
        display: inline-block; padding: 3px 12px; border-radius: 20px;
        background: var(--primary-light); color: var(--primary);
        font-size: 0.78rem; font-weight: 600;
    }
    .article-meta .date { display: flex; align-items: center; gap: 4px; }
    .article-meta .date i { font-size: 0.8rem; }
    .article-cover {
        border-radius: var(--radius-lg); overflow: hidden;
        box-shadow: var(--shadow-md); margin-top: 8px;
        background: var(--border-light); aspect-ratio: 16/7;
        display: flex; align-items: center; justify-content: center;
    }
    .article-cover img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; }

    /* ===== Article Body ===== */
    .article-body-section {
        padding: 48px 0 32px; background: var(--bg-body);
    }
    .article-body {
        background: var(--bg-card); border-radius: var(--radius-lg);
        padding: 40px 48px; box-shadow: var(--shadow-sm);
        border: 1px solid var(--border);
    }
    .article-body .post-content {
        font-size: 1.05rem; line-height: 1.85; color: var(--text-primary);
    }
    .article-body .post-content h2 { margin-top: 36px; margin-bottom: 16px; font-size: 1.6rem; }
    .article-body .post-content h3 { margin-top: 28px; margin-bottom: 12px; font-size: 1.3rem; }
    .article-body .post-content h4 { margin-top: 20px; margin-bottom: 8px; font-size: 1.1rem; }
    .article-body .post-content p { margin-bottom: 1.2rem; color: var(--text-primary); }
    .article-body .post-content ul, .article-body .post-content ol { margin-bottom: 1.2rem; padding-left: 24px; }
    .article-body .post-content ul { list-style: disc; }
    .article-body .post-content ol { list-style: decimal; }
    .article-body .post-content li { margin-bottom: 6px; color: var(--text-primary); }
    .article-body .post-content blockquote {
        border-left: 4px solid var(--primary); background: var(--primary-light);
        padding: 16px 24px; margin: 24px 0; border-radius: 0 var(--radius-md) var(--radius-md) 0;
        font-style: italic; color: var(--text-secondary);
    }
    .article-body .post-content blockquote p { color: var(--text-secondary); }
    .article-body .post-content img { border-radius: var(--radius-md); margin: 24px auto; box-shadow: var(--shadow-sm); }
    .article-body .post-content pre {
        background: #1E293B; color: #E2E8F0; padding: 20px 24px; border-radius: var(--radius-md);
        overflow-x: auto; font-size: 0.9rem; margin: 24px 0; font-family: 'Fira Code', 'Consolas', monospace;
    }
    .article-body .post-content code { font-family: 'Fira Code', 'Consolas', monospace; background: var(--border-light); padding: 2px 8px; border-radius: 4px; font-size: 0.9em; }
    .article-body .post-content pre code { background: transparent; padding: 0; border-radius: 0; }
    .article-body .post-content table { width: 100%; border-collapse: collapse; margin: 24px 0; }
    .article-body .post-content th, .article-body .post-content td {
        border: 1px solid var(--border); padding: 10px 16px; text-align: left;
    }
    .article-body .post-content th { background: var(--primary-light); font-weight: 600; color: var(--text-primary); }
    .article-body .post-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }

    .article-not-found {
        text-align: center; padding: 80px 24px; background: var(--bg-card);
        border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
        border: 1px solid var(--border);
    }
    .article-not-found i { font-size: 3rem; color: var(--text-light); margin-bottom: 20px; display: block; }
    .article-not-found h2 { font-size: 1.6rem; margin-bottom: 12px; }
    .article-not-found p { color: var(--text-secondary); margin-bottom: 24px; }
    .article-not-found .btn { display: inline-flex; }

    /* ===== Tags ===== */
    .article-tags {
        padding: 40px 0 16px; border-top: 1px solid var(--border); margin-top: 40px;
    }
    .article-tags .tags-list { display: flex; flex-wrap: wrap; gap: 8px; }
    .article-tags .tag {
        display: inline-block; padding: 4px 14px; border-radius: 20px;
        background: var(--primary-light); color: var(--primary);
        font-size: 0.82rem; font-weight: 500; transition: all var(--transition);
    }
    .article-tags .tag:hover { background: var(--primary); color: #fff; }
    .article-tags .tag-label { font-weight: 600; color: var(--text-primary); margin-right: 8px; font-size: 0.9rem; }

    /* ===== Related ===== */
    .related-section {
        padding: 48px 0; background: var(--bg-body);
    }
    .related-section .section-title {
        font-size: 1.5rem; font-weight: 700; margin-bottom: 28px;
        display: flex; align-items: center; gap: 12px;
    }
    .related-section .section-title i { color: var(--primary); }
    .related-grid {
        display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    }
    .related-card {
        background: var(--bg-card); border-radius: var(--radius-lg);
        border: 1px solid var(--border); overflow: hidden;
        transition: all var(--transition); box-shadow: var(--shadow-sm);
    }
    .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
    .related-card .card-img {
        aspect-ratio: 16/9; overflow: hidden; background: var(--border-light);
    }
    .related-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; border-radius: 0; }
    .related-card:hover .card-img img { transform: scale(1.05); }
    .related-card .card-body { padding: 18px 20px 20px; }
    .related-card .card-body h4 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; line-height: 1.4; }
    .related-card .card-body h4 a { color: var(--text-primary); }
    .related-card .card-body h4 a:hover { color: var(--primary); }
    .related-card .card-body .card-meta { font-size: 0.8rem; color: var(--text-light); }

    /* ===== CTA ===== */
    .article-cta {
        padding: 48px 0 64px; background: var(--bg-body);
    }
    .article-cta .cta-box {
        background: linear-gradient(135deg, var(--bg-sidebar) 0%, #1E293B 100%);
        border-radius: var(--radius-xl); padding: 48px 56px;
        display: flex; align-items: center; justify-content: space-between; gap: 32px;
        box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
    }
    .article-cta .cta-box::before {
        content: ''; position: absolute; top: -50%; right: -20%;
        width: 400px; height: 400px; border-radius: 50%;
        background: radial-gradient(circle, rgba(79,70,229,0.15) 0%, transparent 70%);
    }
    .article-cta .cta-text { position: relative; z-index: 1; }
    .article-cta .cta-text h3 { color: #fff; font-size: 1.5rem; margin-bottom: 8px; }
    .article-cta .cta-text p { color: var(--text-light); margin-bottom: 0; font-size: 0.95rem; }
    .article-cta .cta-actions { display: flex; gap: 12px; flex-shrink: 0; position: relative; z-index: 1; }

    /* ===== Buttons ===== */
    .btn {
        display: inline-flex; align-items: center; justify-content: center; gap: 8px;
        padding: 10px 28px; border-radius: var(--radius-md); font-weight: 600;
        font-size: 0.92rem; transition: all var(--transition);
        border: 2px solid transparent; cursor: pointer; line-height: 1.4;
        text-decoration: none; white-space: nowrap;
    }
    .btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
    .btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
    .btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(79,70,229,0.35); }
    .btn-primary:active { transform: translateY(0); }
    .btn-secondary { background: transparent; color: var(--text-white); border-color: rgba(255,255,255,0.25); }
    .btn-secondary:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.4); color: #fff; }
    .btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
    .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-1px); }
    .btn-sm { padding: 6px 18px; font-size: 0.82rem; }
    .btn-lg { padding: 14px 36px; font-size: 1.05rem; }

    /* ===== Footer ===== */
    .site-footer {
        background: var(--bg-sidebar); color: var(--text-sidebar); padding: 56px 0 32px;
        border-top: 1px solid rgba(255,255,255,0.05);
    }
    .site-footer .footer-grid {
        display: grid; grid-template-columns: 1.8fr 1fr 1fr; gap: 40px;
    }
    .site-footer .footer-brand { display: flex; align-items: center; gap: 10px; font-size: 1.2rem; font-weight: 700; color: var(--text-white); margin-bottom: 12px; }
    .site-footer .footer-brand .brand-icon { width: 36px; height: 36px; font-size: 1rem; }
    .site-footer p { color: var(--text-light); font-size: 0.9rem; line-height: 1.7; }
    .site-footer h4 { color: var(--text-white); font-size: 0.95rem; font-weight: 600; margin-bottom: 16px; }
    .site-footer ul li { margin-bottom: 10px; }
    .site-footer ul li a { color: var(--text-light); font-size: 0.88rem; transition: color var(--transition); }
    .site-footer ul li a:hover { color: #fff; }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,0.06); margin-top: 40px;
        padding-top: 24px; display: flex; justify-content: space-between;
        font-size: 0.82rem; color: var(--text-light); flex-wrap: wrap; gap: 12px;
    }
    .footer-bottom i { margin-right: 4px; }

    /* ===== Mobile Sidebar Toggle ===== */
    .sidebar.open { transform: translateX(0); }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
        .sidebar { transform: translateX(-100%); }
        .sidebar.open { transform: translateX(0); }
        .mobile-header { display: flex; }
        .main-content { margin-left: 0; padding-top: var(--header-height); }
        .article-header { padding: 32px 0 24px; }
        .article-header h1 { font-size: 1.8rem; }
        .related-grid { grid-template-columns: repeat(2, 1fr); }
        .article-body { padding: 28px 24px; }
    }

    @media (max-width: 768px) {
        .container, .container-narrow { padding: 0 16px; }
        .article-header h1 { font-size: 1.5rem; }
        .article-cover { aspect-ratio: 16/9; }
        .related-grid { grid-template-columns: 1fr; }
        .article-body { padding: 20px 16px; border-radius: var(--radius-md); }
        .article-body .post-content { font-size: 1rem; }
        .article-body .post-content h2 { font-size: 1.35rem; }
        .article-body .post-content h3 { font-size: 1.15rem; }
        .article-cta .cta-box { flex-direction: column; text-align: center; padding: 36px 28px; }
        .article-cta .cta-actions { flex-direction: column; width: 100%; }
        .article-cta .cta-actions .btn { width: 100%; justify-content: center; }
        .site-footer .footer-grid { grid-template-columns: 1fr; gap: 32px; }
        .footer-bottom { flex-direction: column; text-align: center; }
        .article-meta { gap: 10px; font-size: 0.82rem; }
        .article-not-found { padding: 48px 20px; }
    }

    @media (max-width: 520px) {
        .article-header h1 { font-size: 1.3rem; }
        .article-body { padding: 16px 12px; }
        .article-body .post-content { font-size: 0.95rem; }
        .article-body .post-content h2 { font-size: 1.2rem; }
        .article-body .post-content h3 { font-size: 1.05rem; }
        .article-meta { gap: 8px; font-size: 0.78rem; }
        .btn { padding: 8px 20px; font-size: 0.85rem; }
        .btn-lg { padding: 12px 28px; font-size: 0.95rem; }
        .article-cta .cta-box { padding: 28px 20px; }
        .article-cta .cta-text h3 { font-size: 1.2rem; }
        .related-card .card-body { padding: 14px 16px; }
        .article-tags .tag { font-size: 0.75rem; padding: 3px 10px; }
    }