/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --primary-light: #16213e;
            --primary-dark: #0f0f1a;
            --accent: #e94560;
            --accent-hover: #d63851;
            --accent-light: #f05a72;
            --gold: #f5c518;
            --gold-light: #ffe082;
            --bg-body: #f4f6f9;
            --bg-card: #ffffff;
            --bg-dark: #1a1a2e;
            --bg-section-alt: #f0f2f8;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8888a0;
            --text-light: #ffffff;
            --text-dark: #1a1a2e;
            --border-color: #e0e0ec;
            --border-light: #f0f0f8;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --sidebar-width: 260px;
            --header-height: 0px;
            --max-width: 1280px;
            --spacing-section: 80px;
            --spacing-block: 60px;
        }

        /* ===== 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: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        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;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-body);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--text-muted);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-secondary);
        }

        /* ===== Sidebar / App Shell ===== */
        .app-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary);
            color: var(--text-light);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.2);
            transition: transform var(--transition);
        }

        .sidebar-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .sidebar-brand .logo {
            font-size: 24px;
            font-weight: 800;
            letter-spacing: 0.5px;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .sidebar-brand .logo i {
            color: var(--gold);
            font-size: 28px;
        }

        .sidebar-brand .logo-sub {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.5);
            letter-spacing: 2px;
            margin-top: 2px;
            padding-left: 2px;
        }

        .sidebar-nav {
            flex: 1;
            padding: 20px 12px;
            overflow-y: auto;
        }

        .sidebar-nav .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: rgba(255, 255, 255, 0.35);
            padding: 16px 12px 8px;
            font-weight: 600;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            margin-bottom: 2px;
        }

        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: rgba(255, 255, 255, 0.4);
            transition: color var(--transition);
        }

        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-light);
        }

        .sidebar-nav a:hover i {
            color: var(--gold);
        }

        .sidebar-nav a.active {
            background: rgba(233, 69, 96, 0.2);
            color: var(--text-light);
            border-left: 3px solid var(--accent);
        }

        .sidebar-nav a.active i {
            color: var(--accent);
        }

        .sidebar-footer {
            padding: 20px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 12px;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }

        /* ===== Mobile Toggle ===== */
        .mobile-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--primary);
            color: var(--text-light);
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: var(--shadow-md);
            border: none;
            cursor: pointer;
            transition: background var(--transition);
        }

        .mobile-toggle:hover {
            background: var(--primary-light);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

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

        .app-content {
            flex: 1;
        }

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

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

        .section-alt {
            background: var(--bg-section-alt);
        }

        .section-dark {
            background: var(--bg-dark);
            color: var(--text-light);
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 12px;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }

        .section-dark .section-title {
            color: var(--text-light);
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.6;
        }

        .section-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.7);
        }

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

        .section-header .section-subtitle {
            margin: 0 auto;
        }

        .section-divider {
            width: 48px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 16px auto 20px;
        }

        .section-dark .section-divider {
            background: var(--gold);
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 560px;
            display: flex;
            align-items: center;
            background: var(--primary-dark);
            overflow: hidden;
            padding: 80px 0;
        }

        .hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center;
            opacity: 0.25;
            z-index: 0;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(15, 15, 26, 0.92) 0%, rgba(22, 33, 62, 0.7) 50%, rgba(233, 69, 96, 0.15) 100%);
            z-index: 1;
        }

        .hero .container {
            position: relative;
            z-index: 2;
        }

        .hero-content {
            max-width: 680px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(245, 197, 24, 0.15);
            color: var(--gold);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 50px;
            margin-bottom: 20px;
            border: 1px solid rgba(245, 197, 24, 0.2);
        }

        .hero-badge i {
            font-size: 14px;
        }

        .hero h1 {
            font-size: 48px;
            font-weight: 900;
            line-height: 1.15;
            color: var(--text-light);
            margin-bottom: 16px;
            letter-spacing: -1px;
        }

        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--gold), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 560px;
        }

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

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
            border: 2px solid transparent;
            line-height: 1.2;
            text-align: center;
            justify-content: center;
        }

        .btn-primary {
            background: var(--accent);
            color: var(--text-light);
            border-color: var(--accent);
        }

        .btn-primary:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            color: var(--text-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(233, 69, 96, 0.35);
        }

        .btn-outline-light {
            background: transparent;
            color: var(--text-light);
            border-color: rgba(255, 255, 255, 0.3);
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--text-light);
            color: var(--text-light);
            transform: translateY(-2px);
        }

        .btn-accent {
            background: var(--accent);
            color: var(--text-light);
            border-color: var(--accent);
        }

        .btn-accent:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            color: var(--text-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(233, 69, 96, 0.35);
        }

        .btn-gold {
            background: var(--gold);
            color: var(--text-dark);
            border-color: var(--gold);
        }

        .btn-gold:hover {
            background: var(--gold-light);
            border-color: var(--gold-light);
            color: var(--text-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(245, 197, 24, 0.35);
        }

        .btn-sm {
            padding: 8px 20px;
            font-size: 13px;
        }

        .btn-lg {
            padding: 16px 40px;
            font-size: 17px;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }

        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .card-image {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--bg-section-alt);
        }

        .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .card:hover .card-image img {
            transform: scale(1.05);
        }

        .card-image .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--accent);
            color: var(--text-light);
            font-size: 11px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 50px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }

        .card-image .card-tag.gold {
            background: var(--gold);
            color: var(--text-dark);
        }

        .card-body {
            padding: 20px 24px 24px;
        }

        .card-body .card-category {
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.8px;
            margin-bottom: 6px;
        }

        .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 8px;
            color: var(--text-primary);
        }

        .card-body .card-text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 12px;
        }

        .card-body .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-muted);
        }

        .card-body .card-meta i {
            margin-right: 4px;
            font-size: 12px;
        }

        /* ===== Stats / Data Cards ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }

        .stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .stat-card .stat-icon {
            font-size: 36px;
            color: var(--accent);
            margin-bottom: 12px;
        }

        .stat-card .stat-number {
            font-size: 36px;
            font-weight: 900;
            color: var(--text-primary);
            line-height: 1.2;
            letter-spacing: -1px;
        }

        .stat-card .stat-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 4px;
            font-weight: 500;
        }

        .stat-card.gold .stat-icon {
            color: var(--gold);
        }

        /* ===== Grids ===== */
        .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;
        }

        /* ===== Feature Blocks ===== */
        .feature-block {
            display: flex;
            gap: 28px;
            align-items: flex-start;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 32px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }

        .feature-block:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .feature-block .feature-icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(233, 69, 96, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--accent);
        }

        .feature-block .feature-content h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 4px;
            color: var(--text-primary);
        }

        .feature-block .feature-content p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Content List (CMS) ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .content-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 18px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }

        .content-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }

        .content-item .item-index {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(233, 69, 96, 0.1);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 14px;
        }

        .content-item .item-body {
            flex: 1;
            min-width: 0;
        }

        .content-item .item-body h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 2px;
            color: var(--text-primary);
        }

        .content-item .item-body h4 a {
            color: var(--text-primary);
        }

        .content-item .item-body h4 a:hover {
            color: var(--accent);
        }

        .content-item .item-body .item-desc {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .content-item .item-meta {
            flex-shrink: 0;
            text-align: right;
            min-width: 80px;
        }

        .content-item .item-meta .item-category {
            font-size: 11px;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .content-item .item-meta .item-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 2px;
        }

        .empty-state {
            text-align: center;
            padding: 48px 24px;
            color: var(--text-muted);
            font-size: 15px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }

        .empty-state i {
            font-size: 40px;
            color: var(--border-color);
            margin-bottom: 12px;
        }

        /* ===== Process / Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            position: relative;
        }

        .step-card {
            text-align: center;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            position: relative;
            transition: all var(--transition);
        }

        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .step-card .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent);
            color: var(--text-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            margin: 0 auto 16px;
        }

        .step-card .step-icon {
            font-size: 32px;
            color: var(--accent);
            margin-bottom: 12px;
        }

        .step-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }

        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            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-light);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }

        .faq-item .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 16px;
            color: var(--text-primary);
            cursor: pointer;
            gap: 16px;
            transition: background var(--transition);
        }

        .faq-item .faq-question:hover {
            background: rgba(233, 69, 96, 0.03);
        }

        .faq-item .faq-question i {
            font-size: 14px;
            color: var(--text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--accent);
        }

        .faq-item .faq-answer {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }

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

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 30% 50%, rgba(233, 69, 96, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 50%, rgba(245, 197, 24, 0.1) 0%, transparent 60%);
            pointer-events: none;
        }

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

        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            color: var(--text-light);
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 520px;
            margin: 0 auto 32px;
            line-height: 1.6;
        }

        .cta-section .btn {
            font-size: 16px;
            padding: 16px 40px;
        }

        /* ===== Footer ===== */
        .app-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.6);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand .logo {
            font-size: 20px;
            font-weight: 800;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }

        .footer-brand .logo i {
            color: var(--gold);
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h5 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            padding: 4px 0;
            transition: color var(--transition);
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }

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

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(233, 69, 96, 0.1);
            color: var(--accent);
        }

        .badge.gold {
            background: rgba(245, 197, 24, 0.15);
            color: var(--gold);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1200px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 0px;
                --spacing-section: 60px;
            }

            .app-sidebar {
                transform: translateX(-100%);
            }

            .app-sidebar.open {
                transform: translateX(0);
            }

            .sidebar-overlay.open {
                display: block;
            }

            .mobile-toggle {
                display: flex;
            }

            .app-main {
                margin-left: 0;
            }

            .container {
                padding: 0 20px;
            }

            .hero h1 {
                font-size: 36px;
            }

            .grid-3 {
                grid-template-columns: 1fr 1fr;
            }

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

            .hero {
                min-height: 440px;
                padding: 60px 0;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
                --spacing-block: 36px;
            }

            .hero h1 {
                font-size: 30px;
            }

            .hero p {
                font-size: 16px;
            }

            .section-title {
                font-size: 26px;
            }

            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }

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

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

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

            .hero-actions .btn {
                width: 100%;
            }

            .content-item {
                flex-direction: column;
                gap: 8px;
            }

            .content-item .item-meta {
                text-align: left;
                min-width: auto;
            }

            .feature-block {
                flex-direction: column;
                padding: 20px 24px;
            }

            .stat-card .stat-number {
                font-size: 28px;
            }

            .cta-section h2 {
                font-size: 28px;
            }

            .section-header {
                margin-bottom: 32px;
            }

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

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

            .hero h1 {
                font-size: 24px;
            }

            .hero {
                min-height: 360px;
                padding: 40px 0;
            }

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

            .card-body {
                padding: 16px 18px 20px;
            }

            .section-title {
                font-size: 22px;
            }

            .btn-lg {
                padding: 14px 28px;
                font-size: 15px;
            }

            .sidebar-brand {
                padding: 20px 20px 16px;
            }

            .sidebar-brand .logo {
                font-size: 20px;
            }

            .sidebar-nav a {
                padding: 10px 14px;
                font-size: 14px;
            }
        }

        /* ===== Utilities ===== */
        .text-center {
            text-align: center;
        }
        .mt-12 {
            margin-top: 12px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-12 {
            margin-bottom: 12px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --primary-light: #16213e;
            --accent: #e8b84b;
            --accent-hover: #d4a43a;
            --accent-glow: rgba(232, 184, 75, 0.25);
            --bg-body: #0f0f1a;
            --bg-card: #1c1c32;
            --bg-card-hover: #252545;
            --bg-sidebar: #121224;
            --text-primary: #f0ede8;
            --text-secondary: #b8b4ae;
            --text-muted: #7a7772;
            --border-color: #2a2a4a;
            --border-light: #3a3a5a;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
            --header-height: 0px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --font-display: 'Inter', 'Segoe UI', system-ui, sans-serif;
        }

        /* ===== 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-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--text-primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: var(--font-display);
            font-weight: 600;
            line-height: 1.3;
            color: var(--text-primary);
        }
        p {
            margin-bottom: 1em;
            color: var(--text-secondary);
        }
        p:last-child {
            margin-bottom: 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Sidebar / App Shell ===== */
        .app-shell {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            border-right: 1px solid var(--border-color);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            transition: transform var(--transition);
        }
        .sidebar-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .sidebar-brand .logo {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .sidebar-brand .logo i {
            color: var(--accent);
            font-size: 26px;
        }
        .sidebar-nav {
            padding: 16px 12px 24px;
            flex: 1;
        }
        .sidebar-nav .nav-label {
            font-size: 11px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: var(--text-muted);
            padding: 12px 12px 8px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(232, 184, 75, 0.08);
            color: var(--text-primary);
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: rgba(232, 184, 75, 0.12);
            color: var(--accent);
        }
        .sidebar-nav a.active i {
            color: var(--accent);
        }

        /* ===== Main Content Area ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        .page-body {
            flex: 1;
            padding: 40px 0 60px;
        }

        /* ===== Article Header ===== */
        .article-header {
            padding: 40px 0 32px;
            background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-body) 100%);
            border-bottom: 1px solid var(--border-color);
        }
        .article-breadcrumb {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 16px;
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            align-items: center;
        }
        .article-breadcrumb a {
            color: var(--text-muted);
        }
        .article-breadcrumb a:hover {
            color: var(--accent);
        }
        .article-breadcrumb .sep {
            color: var(--border-light);
            margin: 0 4px;
        }
        .article-breadcrumb .current {
            color: var(--text-secondary);
        }
        .article-title {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
            color: var(--text-primary);
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
            font-size: 14px;
            color: var(--text-muted);
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-item i {
            font-size: 14px;
            color: var(--accent);
        }
        .article-meta .category-badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            background: rgba(232, 184, 75, 0.15);
            color: var(--accent);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }

        /* ======== Article Cover ======== */
        .article-cover {
            margin-top: 32px;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            position: relative;
            aspect-ratio: 16 / 7;
            background: var(--bg-card);
        }
        .article-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .article-cover .cover-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60%;
            background: linear-gradient(transparent, rgba(15, 15, 26, 0.85));
            pointer-events: none;
        }

        /* ===== Article Content ===== */
        .article-content-wrap {
            padding-top: 40px;
        }
        .article-body {
            max-width: 780px;
            margin: 0 auto;
        }
        .article-body h2 {
            font-size: 26px;
            margin-top: 40px;
            margin-bottom: 16px;
            color: var(--text-primary);
            border-left: 4px solid var(--accent);
            padding-left: 16px;
        }
        .article-body h3 {
            font-size: 20px;
            margin-top: 32px;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .article-body p {
            font-size: 17px;
            line-height: 1.85;
            color: var(--text-secondary);
            margin-bottom: 1.2em;
        }
        .article-body ul,
        .article-body ol {
            margin: 16px 0 20px;
            padding-left: 24px;
            color: var(--text-secondary);
        }
        .article-body li {
            margin-bottom: 8px;
            line-height: 1.7;
            font-size: 16px;
        }
        .article-body ul li {
            list-style: disc;
        }
        .article-body ol li {
            list-style: decimal;
        }
        .article-body blockquote {
            margin: 28px 0;
            padding: 20px 28px;
            border-left: 4px solid var(--accent);
            background: rgba(232, 184, 75, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-secondary);
        }
        .article-body blockquote p {
            margin-bottom: 0;
            font-size: 17px;
        }
        .article-body code {
            background: rgba(232, 184, 75, 0.1);
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 14px;
            color: var(--accent);
            font-family: 'JetBrains Mono', monospace;
        }
        .article-body pre {
            margin: 24px 0;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.6;
        }
        .article-body img {
            margin: 24px 0;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-sm);
        }
        .article-body a {
            color: var(--accent);
            border-bottom: 1px solid transparent;
        }
        .article-body a:hover {
            border-bottom-color: var(--accent);
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 15px;
        }
        .article-body th,
        .article-body td {
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            text-align: left;
            color: var(--text-secondary);
        }
        .article-body th {
            background: var(--bg-card);
            font-weight: 600;
            color: var(--text-primary);
        }
        .article-body tr:nth-child(even) {
            background: rgba(255, 255, 255, 0.02);
        }

        /* ===== Article Footer ===== */
        .article-footer-bar {
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid var(--border-color);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags .tag {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--accent);
            color: var(--primary);
            border-color: var(--accent);
        }
        .article-share {
            display: flex;
            gap: 10px;
            align-items: center;
            font-size: 14px;
            color: var(--text-muted);
        }
        .article-share a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .article-share a:hover {
            background: var(--accent);
            color: var(--primary);
            border-color: var(--accent);
            transform: translateY(-2px);
        }

        /* ===== Post Navigation ===== */
        .post-nav {
            margin-top: 40px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .post-nav-item {
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .post-nav-item:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .post-nav-item .nav-label {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .post-nav-item .nav-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .post-nav-item.next {
            text-align: right;
        }
        .post-nav-item.next .nav-label {
            justify-content: flex-end;
        }

        /* ===== Related Posts ===== */
        .related-section {
            margin-top: 60px;
            padding-top: 40px;
            border-top: 1px solid var(--border-color);
        }
        .related-section h2 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 28px;
            color: var(--text-primary);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: all var(--transition);
        }
        .related-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .related-card .card-img {
            aspect-ratio: 16 / 9;
            background: var(--bg-body);
            overflow: hidden;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .related-card:hover .card-img img {
            transform: scale(1.05);
        }
        .related-card .card-body {
            padding: 16px 20px 20px;
        }
        .related-card .card-body .card-cat {
            font-size: 11px;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.8px;
            margin-bottom: 6px;
        }
        .related-card .card-body .card-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .card-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 8px;
        }

        /* ===== CTA Section ===== */
        .article-cta {
            margin-top: 60px;
            padding: 48px 40px;
            background: linear-gradient(135deg, var(--bg-card) 0%, var(--primary-light) 100%);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .article-cta::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(232, 184, 75, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }
        .article-cta h3 {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .article-cta p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 520px;
            margin: 0 auto 24px;
        }
        .article-cta .btn-group {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            border: 2px solid transparent;
            text-decoration: none;
        }
        .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 var(--accent-glow);
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            border-color: var(--border-light);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: var(--text-muted);
            color: var(--text-primary);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 24px;
            max-width: 520px;
            margin: 0 auto;
        }
        .not-found-box .nf-icon {
            font-size: 64px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 28px;
            margin-bottom: 12px;
        }
        .not-found-box p {
            font-size: 16px;
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        /* ===== Footer ===== */
        .app-footer {
            background: var(--bg-sidebar);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 32px;
            margin-left: var(--sidebar-width);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            font-size: 22px;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .footer-brand .logo i {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h5 {
            font-size: 13px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.8px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: var(--text-secondary);
            padding: 5px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-col a i {
            margin-right: 8px;
            width: 16px;
            color: var(--accent);
        }
        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
            margin: 0 4px;
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Mobile Toggle ===== */
        .mobile-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            font-size: 20px;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .mobile-toggle:hover {
            background: var(--bg-card-hover);
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .article-title {
                font-size: 30px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
            }
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay.active {
                display: block;
            }
            .mobile-toggle {
                display: flex;
            }
            .main-content {
                margin-left: 0;
            }
            .app-footer {
                margin-left: 0;
            }
            .article-header {
                padding: 24px 0 20px;
            }
            .article-title {
                font-size: 26px;
            }
            .article-cover {
                aspect-ratio: 16 / 9;
                margin-top: 20px;
            }
            .article-body p {
                font-size: 16px;
            }
            .post-nav {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .article-cta {
                padding: 32px 20px;
            }
            .article-cta h3 {
                font-size: 22px;
            }
            .article-footer-bar {
                flex-direction: column;
                align-items: flex-start;
            }
            .page-body {
                padding: 24px 0 40px;
            }
        }

        @media (max-width: 520px) {
            .article-title {
                font-size: 22px;
            }
            .article-meta {
                gap: 12px;
                font-size: 13px;
            }
            .article-body h2 {
                font-size: 20px;
            }
            .article-body h3 {
                font-size: 18px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }
            .article-cta .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Scrollbar ===== */
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 4px;
        }
        .sidebar::-webkit-scrollbar-thumb:hover {
            background: var(--border-light);
        }

        /* ===== Animations ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-in {
            animation: fadeUp 0.6s ease forwards;
        }
        .animate-in-delay-1 {
            animation-delay: 0.1s;
        }
        .animate-in-delay-2 {
            animation-delay: 0.2s;
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #2d4a8e;
            --primary-dark: #0f1a4a;
            --accent: #f0b429;
            --accent-light: #f7d06a;
            --accent-dark: #d4941a;
            --bg-body: #f5f7fc;
            --bg-card: #ffffff;
            --bg-sidebar: #0f1a4a;
            --bg-dark: #1a2a6c;
            --text-primary: #1a2332;
            --text-secondary: #4a5568;
            --text-light: #8a94a6;
            --text-white: #ffffff;
            --border-color: #e2e8f0;
            --border-light: #f0f2f5;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.14);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
            --header-height: 0px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --max-width: 1200px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.6rem;
        }
        h2 {
            font-size: 2rem;
        }
        h3 {
            font-size: 1.4rem;
        }
        h4 {
            font-size: 1.15rem;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Sidebar Navigation (App Shell) ===== */
        .app-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            transition: var(--transition);
            box-shadow: 4px 0 20px rgba(0, 0, 0, 0.2);
        }
        .app-sidebar .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 24px 20px 20px;
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .app-sidebar .sidebar-brand i {
            color: var(--accent);
            font-size: 1.6rem;
        }
        .app-sidebar .sidebar-brand span {
            background: linear-gradient(135deg, #fff 60%, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: rgba(255, 255, 255, 0.35);
            padding: 20px 20px 6px;
            font-weight: 600;
        }
        .sidebar-nav {
            padding: 8px 12px 20px;
            flex: 1;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.4);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            box-shadow: inset 3px 0 0 var(--accent);
        }
        .sidebar-nav a.active i {
            color: var(--accent);
        }

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

        /* ===== Page Header / Banner ===== */
        .page-banner {
            position: relative;
            padding: 80px 0 60px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: var(--text-white);
            text-align: center;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 74, 0.85) 0%, rgba(26, 42, 108, 0.70) 100%);
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }
        .page-banner h1 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .page-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .page-banner .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 20px;
        }
        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .page-banner .breadcrumb a:hover {
            color: var(--accent);
        }
        .page-banner .breadcrumb span {
            color: var(--accent);
        }

        /* ===== Section Shared ===== */
        .section {
            padding: 70px 0;
        }
        .section-alt {
            background: var(--bg-card);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3 {
            color: #fff;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 700;
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 12px auto 0;
            font-size: 1.05rem;
        }
        .section-dark .section-title p {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }
        .card .card-body {
            padding: 22px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card .card-body h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
            font-weight: 700;
        }
        .card .card-body p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
            margin-bottom: 12px;
            flex: 1;
        }
        .card .card-meta {
            font-size: 0.85rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: auto;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }
        .card .card-meta i {
            margin-right: 4px;
        }
        .card .badge {
            display: inline-block;
            padding: 3px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--accent);
            color: var(--text-primary);
            margin-bottom: 8px;
            align-self: flex-start;
        }
        .card .badge.blue {
            background: var(--primary-light);
            color: #fff;
        }
        .card .badge.green {
            background: #10b981;
            color: #fff;
        }

        /* ===== Button ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: 2px solid transparent;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--text-primary);
            border-color: var(--accent);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(240, 180, 41, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.4);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline-dark {
            background: transparent;
            color: var(--text-primary);
            border-color: var(--border-color);
        }
        .btn-outline-dark:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }

        /* ===== Tag / Label ===== */
        .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            background: var(--bg-body);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .tag:hover {
            border-color: var(--accent);
            color: var(--accent-dark);
            background: rgba(240, 180, 41, 0.06);
        }
        .tag.active {
            background: var(--accent);
            color: var(--text-primary);
            border-color: var(--accent);
        }

        /* ===== Stats / Data Block ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .stat-card .stat-icon {
            font-size: 2rem;
            color: var(--primary-light);
            margin-bottom: 10px;
        }
        .stat-card .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        /* ===== 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-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent);
        }
        .faq-item summary {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 12px;
            list-style: none;
            transition: var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary i {
            color: var(--accent);
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .faq-item[open] summary i {
            transform: rotate(45deg);
        }
        .faq-item .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            text-align: center;
            color: var(--text-white);
            position: relative;
            overflow: hidden;
        }
        .cta-block::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 74, 0.82) 0%, rgba(26, 42, 108, 0.72) 100%);
            pointer-events: none;
            border-radius: var(--radius-lg);
        }
        .cta-block .container {
            position: relative;
            z-index: 2;
        }
        .cta-block h2 {
            font-size: 2rem;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-block p {
            color: rgba(255, 255, 255, 0.8);
            max-width: 580px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }
        .cta-block .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Content List ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .content-item {
            display: flex;
            gap: 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            align-items: flex-start;
        }
        .content-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .content-item .item-index {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent);
            min-width: 44px;
            line-height: 1;
        }
        .content-item .item-body h4 {
            font-size: 1.1rem;
            margin-bottom: 4px;
        }
        .content-item .item-body p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.6;
        }
        .content-item .item-body .tag {
            margin-top: 8px;
        }

        /* ===== Footer ===== */
        .app-footer {
            background: var(--bg-sidebar);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 32px;
            margin-top: auto;
        }
        .app-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .app-footer .footer-brand .logo {
            font-size: 1.4rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }
        .app-footer .footer-brand .logo i {
            color: var(--accent);
        }
        .app-footer .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
        }
        .app-footer .footer-col h5 {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: rgba(255, 255, 255, 0.4);
            margin-bottom: 16px;
            font-weight: 600;
        }
        .app-footer .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.92rem;
            padding: 4px 0;
            transition: var(--transition);
        }
        .app-footer .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .app-footer .footer-col a i {
            margin-right: 6px;
            width: 16px;
            text-align: center;
        }
        .app-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .app-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .app-footer .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Mobile Toggle ===== */
        .sidebar-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--bg-sidebar);
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: var(--shadow-md);
            border: none;
            cursor: pointer;
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.45);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .app-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .app-sidebar {
                transform: translateX(-100%);
            }
            .app-sidebar.open {
                transform: translateX(0);
            }
            .sidebar-toggle {
                display: flex;
            }
            .sidebar-overlay.open {
                display: block;
            }
            .app-main {
                margin-left: 0;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .page-banner {
                padding: 60px 0 40px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 1rem;
            }
            .section {
                padding: 48px 0;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
            .cta-block {
                padding: 40px 24px;
            }
            .cta-block h2 {
                font-size: 1.5rem;
            }
            .app-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .app-footer .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }
            .content-item {
                flex-direction: column;
                gap: 12px;
                padding: 16px 18px;
            }
            .content-item .item-index {
                font-size: 1.4rem;
            }
            .stat-card .stat-number {
                font-size: 1.6rem;
            }
            .faq-item summary {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-item .faq-answer {
                padding: 0 18px 16px;
            }
            .container {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 20px 12px;
            }
            .stat-card .stat-number {
                font-size: 1.4rem;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .btn {
                padding: 10px 20px;
                font-size: 0.88rem;
            }
            .section-title h2 {
                font-size: 1.35rem;
            }
            .card .card-body {
                padding: 16px 18px 20px;
            }
            .card .card-img {
                height: 160px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .flex-center {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .gap-12 {
            gap: 12px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }