/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1340a8;
            --primary-light: #e8effd;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --accent: #10b981;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-section-alt: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 16px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
            --nav-secondary-height: 52px;
            --gap-section: 90px;
            --gap-section-md: 60px;
            --gap-section-sm: 40px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; transition: var(--transition); }
        button:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
        input, textarea { font-family: inherit; font-size: 1rem; border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 10px 16px; transition: var(--transition); background: var(--bg-white); color: var(--text-primary); }
        input:focus, textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,86,219,0.12); }
        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: 2.8rem; letter-spacing: -0.02em; }
        h2 { font-size: 2rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; color: var(--text-secondary); }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow { max-width: 800px; }
        .container-wide { max-width: 1400px; }

        /* ===== Section Spacing ===== */
        .section { padding: var(--gap-section) 0; }
        .section-alt { background: var(--bg-section-alt); }
        .section-dark { background: var(--bg-dark); color: var(--text-white); }
        .section-dark h2, .section-dark h3, .section-dark p { color: var(--text-white); }
        .section-header { text-align: center; margin-bottom: 48px; }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { max-width: 620px; margin: 0 auto; font-size: 1.1rem; color: var(--text-secondary); }
        .section-dark .section-header p { color: rgba(255,255,255,0.7); }
        .badge-section {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .section-dark .badge-section { background: rgba(255,255,255,0.12); color: var(--secondary); }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky; top: 0; z-index: 1000;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 1px 4px rgba(0,0,0,0.02);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            padding: 0 24px;
            max-width: var(--container-max);
            margin: 0 auto;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
        }
        .logo i { font-size: 1.7rem; color: var(--secondary); }
        .logo:hover { color: var(--primary-dark); }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .header-search {
            display: flex;
            align-items: center;
            background: var(--bg-section-alt);
            border-radius: 50px;
            padding: 0 16px;
            height: 40px;
            border: 1px solid transparent;
            transition: var(--transition);
        }
        .header-search:focus-within {
            border-color: var(--primary);
            background: var(--bg-white);
            box-shadow: 0 0 0 3px rgba(26,86,219,0.08);
        }
        .header-search input {
            border: none;
            background: transparent;
            padding: 0 8px;
            font-size: 0.9rem;
            min-width: 160px;
            outline: none;
            color: var(--text-primary);
        }
        .header-search input::placeholder { color: var(--text-muted); }
        .header-search button {
            color: var(--text-muted);
            font-size: 1rem;
            padding: 0 4px;
        }
        .header-search button:hover { color: var(--primary); }
        .header-cta {
            background: var(--primary);
            color: var(--text-white);
            padding: 9px 24px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            white-space: nowrap;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(26,86,219,0.25);
        }
        .header-cta:hover {
            background: var(--primary-dark);
            color: var(--text-white);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(26,86,219,0.35);
        }
        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            padding: 4px 8px;
            border-radius: 6px;
        }
        .mobile-toggle:hover { background: var(--bg-section-alt); }

        /* Secondary Nav (Tabs) */
        .nav-secondary-wrap {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 1px 3px rgba(0,0,0,0.02);
        }
        .nav-secondary {
            display: flex;
            align-items: center;
            height: var(--nav-secondary-height);
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            gap: 4px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .nav-secondary::-webkit-scrollbar { display: none; }
        .nav-secondary a {
            display: flex;
            align-items: center;
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            white-space: nowrap;
            transition: var(--transition);
            gap: 8px;
        }
        .nav-secondary a i { font-size: 0.85rem; }
        .nav-secondary a:hover {
            background: var(--bg-section-alt);
            color: var(--text-primary);
        }
        .nav-secondary a.active {
            background: var(--primary);
            color: var(--text-white);
            font-weight: 600;
            box-shadow: 0 2px 8px rgba(26,86,219,0.25);
        }
        .nav-secondary a.active:hover {
            background: var(--primary-dark);
        }

        /* ===== Hero Section ===== */
        .hero {
            position: relative;
            min-height: 560px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.35;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(26,86,219,0.25) 0%, transparent 70%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .hero-content {
            max-width: 700px;
            padding: 40px 0;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.10);
            backdrop-filter: blur(8px);
            padding: 6px 18px 6px 12px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.85);
            margin-bottom: 24px;
            border: 1px solid rgba(255,255,255,0.08);
        }
        .hero-badge i { color: var(--secondary); font-size: 0.8rem; }
        .hero h1 {
            font-size: 3.2rem;
            color: var(--text-white);
            margin-bottom: 18px;
            line-height: 1.15;
        }
        .hero h1 span { color: var(--secondary); }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.7);
            margin-bottom: 32px;
            max-width: 560px;
            line-height: 1.6;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--text-white);
            box-shadow: 0 4px 16px rgba(26,86,219,0.30);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(26,86,219,0.40);
        }
        .btn-secondary {
            background: rgba(255,255,255,0.10);
            color: var(--text-white);
            border: 1px solid rgba(255,255,255,0.18);
            backdrop-filter: blur(6px);
        }
        .btn-secondary:hover {
            background: rgba(255,255,255,0.18);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .btn-sm { padding: 10px 22px; font-size: 0.9rem; }
        .btn-lg { padding: 16px 40px; font-size: 1.1rem; }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.08);
        }
        .hero-stat h3 { font-size: 2rem; color: var(--text-white); margin-bottom: 2px; }
        .hero-stat p { font-size: 0.9rem; color: rgba(255,255,255,0.5); margin: 0; }

        /* ===== Feature / Core Cards ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
            background: var(--primary-light);
            color: var(--primary);
        }
        .feature-card h3 { margin-bottom: 10px; font-size: 1.2rem; }
        .feature-card p { font-size: 0.95rem; margin: 0; color: var(--text-secondary); }

        /* ===== Category Entry ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .category-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .category-card-body {
            padding: 20px 22px 24px;
        }
        .category-card-body h3 { font-size: 1.05rem; margin-bottom: 6px; }
        .category-card-body p { font-size: 0.9rem; color: var(--text-muted); margin: 0; }
        .category-card .tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 50px;
            margin-bottom: 10px;
        }

        /* ===== Latest News / CMS List ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .news-card {
            display: flex;
            gap: 20px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 20px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .news-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .news-card img {
            width: 140px;
            height: 100px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .news-card-content { flex: 1; min-width: 0; }
        .news-card-content h3 {
            font-size: 1rem;
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card-content h3 a { color: var(--text-primary); }
        .news-card-content h3 a:hover { color: var(--primary); }
        .news-card-content p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin: 0 0 8px 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .news-meta i { margin-right: 4px; }
        .news-meta .cat { color: var(--primary); font-weight: 500; }
        .empty-news {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
            color: var(--text-muted);
        }
        .empty-news i { font-size: 2.5rem; margin-bottom: 16px; color: var(--border-color); display: block; }

        /* ===== Stats / Data Block ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .stat-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .stat-label { font-size: 0.95rem; color: var(--text-secondary); margin: 0; }

        /* ===== Process / Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border-color);
            position: relative;
            transition: var(--transition);
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 1.3rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            transition: var(--transition);
        }
        .step-card:hover .step-number {
            background: var(--primary);
            color: var(--text-white);
        }
        .step-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
        .step-card p { font-size: 0.9rem; color: var(--text-secondary); margin: 0; }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            gap: 16px;
            background: none;
            width: 100%;
            text-align: left;
        }
        .faq-question i {
            color: var(--text-muted);
            transition: var(--transition);
            font-size: 1rem;
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p { margin: 0; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-section h2 {
            color: var(--text-white);
            font-size: 2.2rem;
            margin-bottom: 14px;
            position: relative;
        }
        .cta-section p {
            color: rgba(255,255,255,0.8);
            font-size: 1.1rem;
            max-width: 540px;
            margin: 0 auto 32px;
            position: relative;
        }
        .cta-section .btn {
            background: var(--text-white);
            color: var(--primary);
            font-weight: 700;
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
            position: relative;
        }
        .cta-section .btn:hover {
            background: var(--secondary);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(0,0,0,0.20);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            margin-bottom: 32px;
        }
        .footer-brand .logo { color: var(--text-white); margin-bottom: 14px; }
        .footer-brand .logo i { color: var(--secondary); }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.5); max-width: 320px; }
        .footer-col h4 {
            color: var(--text-white);
            font-size: 1rem;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.55);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-col a:hover { color: var(--secondary); padding-left: 4px; }
        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 18px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.6);
            font-size: 1rem;
            padding: 0;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: var(--text-white);
            padding: 0;
            transform: translateY(-2px);
        }
        .footer-bottom {
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--secondary); }

        /* ===== Back to Top ===== */
        .back-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: var(--shadow-md);
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: var(--transition);
            z-index: 900;
        }
        .back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
        .back-top:hover { background: var(--primary-dark); transform: translateY(-4px); box-shadow: var(--shadow-lg); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.7rem; }
            .hero h1 { font-size: 2.6rem; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .category-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
            .news-grid { grid-template-columns: 1fr; }
            .cta-section { padding: 48px 32px; }
            .cta-section h2 { font-size: 1.8rem; }
        }
        @media (max-width: 768px) {
            :root { --header-height: 64px; --nav-secondary-height: 46px; --gap-section: 56px; --gap-section-md: 40px; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.5rem; }
            .hero { min-height: 440px; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stat h3 { font-size: 1.5rem; }
            .header-search input { min-width: 100px; }
            .header-cta { padding: 8px 18px; font-size: 0.85rem; }
            .features-grid { grid-template-columns: 1fr; }
            .category-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .steps-grid { grid-template-columns: 1fr; }
            .news-card { flex-direction: column; }
            .news-card img { width: 100%; height: 160px; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .cta-section { padding: 36px 24px; border-radius: var(--radius-md); }
            .cta-section h2 { font-size: 1.5rem; }
            .mobile-toggle { display: block; }
            .header-actions .header-search { display: none; }
            .nav-secondary { padding: 0 16px; gap: 2px; }
            .nav-secondary a { padding: 6px 14px; font-size: 0.82rem; }
            .back-top { bottom: 20px; right: 20px; width: 42px; height: 42px; font-size: 1rem; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            h1 { font-size: 1.6rem; }
            h2 { font-size: 1.3rem; }
            .hero h1 { font-size: 1.6rem; }
            .hero-stats { flex-direction: column; gap: 16px; }
            .stats-grid { grid-template-columns: 1fr; }
            .category-grid { grid-template-columns: 1fr; }
            .header-cta { display: none; }
            .logo { font-size: 1.2rem; }
            .logo i { font-size: 1.3rem; }
            .section { padding: 40px 0; }
            .section-header { margin-bottom: 32px; }
            .feature-card { padding: 24px 20px; }
            .cta-section { padding: 28px 20px; }
            .cta-section .btn { width: 100%; }
        }

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

/* roulang page: article */
/* ===== Design Variables ===== */
    :root {
        --primary: #E85D3A;
        --primary-dark: #C94A2A;
        --primary-light: #FCE8E0;
        --secondary: #2B3E50;
        --secondary-light: #3D556B;
        --accent: #F5A623;
        --bg-body: #F8F6F3;
        --bg-white: #FFFFFF;
        --bg-light: #F0EDE8;
        --bg-dark: #1E2A36;
        --text-dark: #1A1A2E;
        --text-main: #2C3E50;
        --text-muted: #7F8C9B;
        --text-light: #B0BEC5;
        --border: #E6E1DA;
        --radius-sm: 8px;
        --radius-md: 14px;
        --radius-lg: 20px;
        --radius-xl: 28px;
        --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
        --shadow-md: 0 6px 24px rgba(0,0,0,0.08);
        --shadow-lg: 0 14px 40px rgba(0,0,0,0.12);
        --shadow-xl: 0 20px 60px rgba(0,0,0,0.18);
        --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --max-width: 1200px;
        --header-h: 72px;
    }

    /* ===== 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-main);
        background: var(--bg-body);
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--primary-dark); }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
    button, input, textarea { font-family: inherit; font-size: inherit; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--text-dark); }

    /* ===== Container ===== */
    .container {
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 24px;
    }
    @media (max-width: 768px) {
        .container { padding: 0 18px; }
    }

    /* ===== Header / Nav ===== */
    .site-header {
        background: var(--bg-white);
        box-shadow: 0 1px 4px rgba(0,0,0,0.05);
        position: sticky;
        top: 0;
        z-index: 100;
        height: var(--header-h);
    }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: var(--header-h);
        gap: 20px;
    }
    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 22px;
        font-weight: 800;
        color: var(--text-dark);
        white-space: nowrap;
    }
    .logo i { color: var(--primary); font-size: 26px; }
    .logo:hover { color: var(--primary); }
    .header-actions {
        display: flex;
        align-items: center;
        gap: 16px;
    }
    .header-search {
        display: flex;
        align-items: center;
        background: var(--bg-light);
        border-radius: 40px;
        padding: 0 16px;
        height: 40px;
        transition: var(--transition);
        border: 1px solid transparent;
    }
    .header-search:focus-within {
        border-color: var(--primary);
        background: var(--bg-white);
        box-shadow: 0 0 0 3px rgba(232,93,58,0.12);
    }
    .header-search input {
        border: none;
        background: transparent;
        padding: 6px 0;
        width: 160px;
        outline: none;
        color: var(--text-main);
        font-size: 14px;
    }
    .header-search input::placeholder { color: var(--text-muted); }
    .header-search button {
        background: none;
        border: none;
        color: var(--text-muted);
        cursor: pointer;
        padding: 6px 4px 6px 10px;
        font-size: 15px;
        transition: var(--transition);
    }
    .header-search button:hover { color: var(--primary); }
    .cta-btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: var(--primary);
        color: #fff;
        padding: 10px 24px;
        border-radius: 40px;
        font-weight: 600;
        font-size: 14px;
        border: none;
        cursor: pointer;
        transition: var(--transition);
        white-space: nowrap;
    }
    .cta-btn:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(232,93,58,0.35); }
    .cta-btn i { font-size: 14px; }

    /* ===== Secondary Nav (Tabs) ===== */
    .nav-secondary {
        background: var(--bg-white);
        border-bottom: 1px solid var(--border);
        padding: 0 24px;
        display: flex;
        align-items: center;
        gap: 4px;
        overflow-x: auto;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    .nav-secondary::-webkit-scrollbar { display: none; }
    .nav-secondary a {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 14px 20px;
        font-size: 14px;
        font-weight: 500;
        color: var(--text-muted);
        border-bottom: 3px solid transparent;
        transition: var(--transition);
        white-space: nowrap;
    }
    .nav-secondary a i { font-size: 14px; }
    .nav-secondary a:hover { color: var(--text-main); background: var(--bg-light); }
    .nav-secondary a.active {
        color: var(--primary);
        border-bottom-color: var(--primary);
        background: transparent;
        font-weight: 600;
    }
    .nav-secondary a.active i { color: var(--primary); }

    /* ===== Article Banner ===== */
    .article-banner {
        position: relative;
        background: var(--bg-dark);
        min-height: 320px;
        display: flex;
        align-items: center;
        overflow: hidden;
    }
    .article-banner-bg {
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
        opacity: 0.3;
        z-index: 0;
    }
    .article-banner .container {
        position: relative;
        z-index: 1;
        padding-top: 40px;
        padding-bottom: 40px;
    }
    .article-banner-meta {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 12px 20px;
        margin-bottom: 18px;
    }
    .article-banner-meta .category-tag {
        background: var(--primary);
        color: #fff;
        padding: 4px 16px;
        border-radius: 30px;
        font-size: 13px;
        font-weight: 600;
        letter-spacing: 0.3px;
    }
    .article-banner-meta .date {
        color: rgba(255,255,255,0.7);
        font-size: 14px;
        display: flex;
        align-items: center;
        gap: 6px;
    }
    .article-banner-meta .date i { font-size: 13px; }
    .article-banner h1 {
        font-size: 36px;
        color: #fff;
        max-width: 800px;
        line-height: 1.3;
        margin-bottom: 14px;
        font-weight: 800;
    }
    .article-banner p {
        color: rgba(255,255,255,0.8);
        font-size: 17px;
        max-width: 640px;
        line-height: 1.6;
    }

    @media (max-width: 768px) {
        .article-banner { min-height: 240px; }
        .article-banner h1 { font-size: 26px; }
        .article-banner p { font-size: 15px; }
    }

    /* ===== Main Content ===== */
    .article-main {
        padding: 48px 0 60px;
    }
    .article-layout {
        display: grid;
        grid-template-columns: 1fr 300px;
        gap: 48px;
    }
    .article-body {
        background: var(--bg-white);
        border-radius: var(--radius-md);
        padding: 40px 44px;
        box-shadow: var(--shadow-sm);
    }
    .article-body .content {
        font-size: 16.5px;
        line-height: 1.85;
        color: var(--text-main);
    }
    .article-body .content p {
        margin-bottom: 1.4em;
    }
    .article-body .content h2 {
        font-size: 24px;
        margin-top: 1.8em;
        margin-bottom: 0.6em;
        color: var(--text-dark);
    }
    .article-body .content h3 {
        font-size: 20px;
        margin-top: 1.4em;
        margin-bottom: 0.5em;
        color: var(--text-dark);
    }
    .article-body .content ul,
    .article-body .content ol {
        margin-bottom: 1.4em;
        padding-left: 1.6em;
    }
    .article-body .content li {
        margin-bottom: 0.5em;
        list-style: disc;
    }
    .article-body .content img {
        border-radius: var(--radius-sm);
        margin: 1.6em 0;
        width: 100%;
    }
    .article-body .content blockquote {
        border-left: 4px solid var(--primary);
        background: var(--primary-light);
        padding: 14px 20px;
        margin: 1.4em 0;
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        color: var(--text-main);
    }
    .article-body .content a {
        color: var(--primary);
        text-decoration: underline;
        text-underline-offset: 2px;
    }
    .article-body .content a:hover { color: var(--primary-dark); }

    .article-not-found {
        text-align: center;
        padding: 80px 20px;
    }
    .article-not-found i { font-size: 56px; color: var(--text-light); margin-bottom: 20px; display: block; }
    .article-not-found h2 { font-size: 28px; margin-bottom: 12px; }
    .article-not-found p { color: var(--text-muted); margin-bottom: 24px; }
    .article-not-found .back-link { display: inline-flex; align-items: center; gap: 8px; }

    /* ===== Sidebar ===== */
    .article-sidebar {
        display: flex;
        flex-direction: column;
        gap: 28px;
    }
    .sidebar-card {
        background: var(--bg-white);
        border-radius: var(--radius-md);
        padding: 28px 24px;
        box-shadow: var(--shadow-sm);
    }
    .sidebar-card h3 {
        font-size: 18px;
        margin-bottom: 16px;
        padding-bottom: 12px;
        border-bottom: 2px solid var(--border);
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .sidebar-card h3 i { color: var(--primary); font-size: 16px; }
    .sidebar-list li {
        padding: 10px 0;
        border-bottom: 1px solid var(--border);
    }
    .sidebar-list li:last-child { border-bottom: none; }
    .sidebar-list a {
        display: flex;
        align-items: flex-start;
        gap: 10px;
        color: var(--text-main);
        font-size: 14.5px;
        line-height: 1.4;
    }
    .sidebar-list a:hover { color: var(--primary); }
    .sidebar-list a i { margin-top: 3px; font-size: 12px; color: var(--text-light); }
    .sidebar-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .sidebar-tags a {
        background: var(--bg-light);
        color: var(--text-muted);
        padding: 6px 14px;
        border-radius: 30px;
        font-size: 13px;
        font-weight: 500;
        transition: var(--transition);
    }
    .sidebar-tags a:hover { background: var(--primary); color: #fff; }
    .sidebar-cta {
        background: linear-gradient(135deg, var(--primary), var(--primary-dark));
        color: #fff;
        border-radius: var(--radius-md);
        padding: 28px 24px;
        text-align: center;
    }
    .sidebar-cta h4 { color: #fff; font-size: 18px; margin-bottom: 8px; }
    .sidebar-cta p { color: rgba(255,255,255,0.85); font-size: 14px; margin-bottom: 16px; }
    .sidebar-cta .cta-btn { background: #fff; color: var(--primary); }
    .sidebar-cta .cta-btn:hover { background: var(--bg-light); color: var(--primary-dark); }

    @media (max-width: 900px) {
        .article-layout { grid-template-columns: 1fr; gap: 32px; }
        .article-body { padding: 28px 24px; }
    }
    @media (max-width: 520px) {
        .article-body { padding: 20px 16px; }
        .article-body .content { font-size: 15px; }
        .sidebar-card { padding: 20px 16px; }
    }

    /* ===== Footer ===== */
    .site-footer {
        background: var(--bg-dark);
        color: rgba(255,255,255,0.75);
        padding: 60px 0 0;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
    }
    .footer-brand .logo { color: #fff; margin-bottom: 14px; font-size: 20px; }
    .footer-brand .logo i { color: var(--primary); }
    .footer-brand p { font-size: 14px; line-height: 1.7; max-width: 340px; color: rgba(255,255,255,0.6); }
    .footer-social { display: flex; gap: 12px; margin-top: 18px; }
    .footer-social a {
        display: flex; align-items: center; justify-content: center;
        width: 40px; height: 40px; border-radius: 50%;
        background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.7);
        font-size: 18px; transition: var(--transition);
    }
    .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
    .footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 18px; font-weight: 600; }
    .footer-col a {
        display: block; color: rgba(255,255,255,0.55);
        font-size: 14px; padding: 5px 0; transition: var(--transition);
    }
    .footer-col a:hover { color: #fff; padding-left: 4px; }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,0.08);
        padding: 24px 0;
        margin-top: 40px;
        text-align: center;
        font-size: 13px;
        color: rgba(255,255,255,0.4);
    }
    .footer-bottom a { color: rgba(255,255,255,0.5); }
    .footer-bottom a:hover { color: #fff; }

    @media (max-width: 900px) {
        .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        .footer-brand { grid-column: 1 / -1; }
    }
    @media (max-width: 520px) {
        .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        .footer-bottom { font-size: 12px; }
    }

    /* ===== Mobile Menu Toggle ===== */
    .mobile-toggle {
        display: none;
        background: none; border: none; font-size: 24px;
        color: var(--text-dark); cursor: pointer; padding: 6px;
    }
    @media (max-width: 768px) {
        .mobile-toggle { display: block; }
        .header-search input { width: 100px; }
        .header-actions .cta-btn span { display: none; }
        .cta-btn { padding: 10px 16px; }
        .nav-secondary { padding: 0 12px; }
        .nav-secondary a { padding: 12px 14px; font-size: 13px; }
    }

    /* ===== Breadcrumb ===== */
    .breadcrumb {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 13px;
        color: var(--text-muted);
        padding: 14px 0 6px;
    }
    .breadcrumb a { color: var(--text-muted); }
    .breadcrumb a:hover { color: var(--primary); }
    .breadcrumb i { font-size: 11px; color: var(--text-light); }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
        .container { padding: 0 20px; }
    }
    @media (max-width: 520px) {
        .article-banner h1 { font-size: 22px; }
        .article-banner-meta { gap: 8px 14px; }
        .article-banner-meta .category-tag { font-size: 12px; padding: 3px 12px; }
    }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a6df5;
            --primary-dark: #0d4fa8;
            --primary-light: #e8f0fe;
            --secondary: #f59e0b;
            --secondary-light: #fef3c7;
            --accent: #10b981;
            --accent-light: #d1fae5;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-muted: #1e293b;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.16);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 9999px;
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-4xl: 80px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --transition: 0.25s 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-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);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        button { font-family: inherit; cursor: pointer; border: none; background: none; font-size: inherit; }
        input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: var(--space-lg);
            padding-right: var(--space-lg);
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-sm);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-sm) 0;
            gap: var(--space-md);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            white-space: nowrap;
        }
        .logo i { font-size: 1.5rem; color: var(--secondary); }
        .logo span { color: var(--text-primary); }
        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--space-md);
        }
        .header-actions .search-box {
            display: flex;
            align-items: center;
            background: var(--bg-body);
            border: 1px solid var(--border);
            border-radius: var(--radius-full);
            padding: 0 var(--space-md);
            transition: border var(--transition), box-shadow var(--transition);
        }
        .header-actions .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26,109,245,0.12);
        }
        .header-actions .search-box input {
            border: none;
            background: transparent;
            padding: 8px 6px;
            outline: none;
            min-width: 160px;
            font-size: 0.9rem;
            color: var(--text-primary);
        }
        .header-actions .search-box input::placeholder { color: var(--text-muted); }
        .header-actions .search-box i { color: var(--text-muted); font-size: 0.9rem; }
        .header-actions .btn-download {
            background: var(--primary);
            color: #fff;
            padding: 8px 20px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.9rem;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .header-actions .btn-download:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(26,109,245,0.35);
        }
        .header-actions .btn-download:active { transform: scale(0.97); }

        /* Secondary Nav (Tabs) */
        .nav-secondary {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
            padding: var(--space-sm) 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            border-top: 1px solid var(--border-light);
        }
        .nav-secondary::-webkit-scrollbar { display: none; }
        .nav-secondary a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 7px 18px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            white-space: nowrap;
            transition: background var(--transition), color var(--transition);
        }
        .nav-secondary a i { font-size: 0.85rem; }
        .nav-secondary a:hover { background: var(--primary-light); color: var(--primary); }
        .nav-secondary a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 2px 8px rgba(26,109,245,0.25);
        }
        .nav-secondary a.active:hover { background: var(--primary-dark); }

        /* ===== Hero / Banner Section ===== */
        .page-banner {
            position: relative;
            padding: var(--space-4xl) 0 var(--space-3xl);
            background: var(--bg-dark) url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            color: var(--text-white);
            text-align: center;
            overflow: hidden;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.78) 0%, rgba(15,23,42,0.55) 100%);
            z-index: 1;
        }
        .page-banner .container { position: relative; z-index: 2; }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: var(--space-md);
            letter-spacing: -0.02em;
        }
        .page-banner p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.85);
            max-width: 680px;
            margin: 0 auto var(--space-lg);
            line-height: 1.7;
        }
        .banner-actions {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-md);
            justify-content: center;
        }
        .banner-actions .btn-primary {
            background: var(--secondary);
            color: #1e293b;
            padding: 14px 36px;
            border-radius: var(--radius-full);
            font-weight: 700;
            font-size: 1.05rem;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 20px rgba(245,158,11,0.35);
        }
        .banner-actions .btn-primary:hover {
            background: #d97706;
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(245,158,11,0.4);
        }
        .banner-actions .btn-secondary {
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(6px);
            color: #fff;
            padding: 14px 36px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 1.05rem;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            border: 1px solid rgba(255,255,255,0.2);
            transition: background var(--transition), transform var(--transition);
        }
        .banner-actions .btn-secondary:hover {
            background: rgba(255,255,255,0.2);
            transform: translateY(-2px);
        }
        .banner-badges {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-sm);
            justify-content: center;
            margin-top: var(--space-lg);
        }
        .banner-badges span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            background: rgba(255,255,255,0.08);
            backdrop-filter: blur(4px);
            padding: 5px 14px;
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            color: rgba(255,255,255,0.85);
            border: 1px solid rgba(255,255,255,0.08);
        }
        .banner-badges span i { color: var(--secondary); }

        /* ===== Section Shared ===== */
        .section {
            padding: var(--space-3xl) 0;
        }
        .section-alt {
            background: var(--bg-white);
        }
        .section-header {
            text-align: center;
            margin-bottom: var(--space-2xl);
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: var(--space-sm);
            letter-spacing: -0.01em;
        }
        .section-header p {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section-header .badge-sub {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 16px;
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            font-weight: 600;
            margin-bottom: var(--space-sm);
        }

        /* ===== Download Cards ===== */
        .download-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .download-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--space-xl) var(--space-lg);
            text-align: center;
            transition: transform var(--transition), box-shadow var(--transition);
            position: relative;
            overflow: hidden;
        }
        .download-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .download-card .icon-wrap {
            width: 64px;
            height: 64px;
            margin: 0 auto var(--space-md);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: #fff;
        }
        .download-card .icon-wrap.ios { background: #1a1a2e; }
        .download-card .icon-wrap.android { background: #10b981; }
        .download-card .icon-wrap.pc { background: var(--primary); }
        .download-card h3 { font-size: 1.2rem; margin-bottom: var(--space-xs); }
        .download-card .version { color: var(--text-muted); font-size: 0.85rem; margin-bottom: var(--space-sm); }
        .download-card p { color: var(--text-secondary); font-size: 0.92rem; margin-bottom: var(--space-md); }
        .download-card .btn-download-card {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            padding: 10px 28px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.92rem;
            transition: background var(--transition), transform var(--transition);
        }
        .download-card .btn-download-card:hover { background: var(--primary-dark); transform: scale(1.03); }
        .download-card .badge-hot {
            position: absolute;
            top: 12px;
            right: 12px;
            background: #ef4444;
            color: #fff;
            font-size: 0.72rem;
            font-weight: 700;
            padding: 3px 12px;
            border-radius: var(--radius-full);
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-lg);
        }
        .step-card {
            text-align: center;
            position: relative;
        }
        .step-card .step-num {
            width: 48px;
            height: 48px;
            margin: 0 auto var(--space-md);
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 1.2rem;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 2px solid var(--primary);
            transition: background var(--transition), color var(--transition);
        }
        .step-card:hover .step-num {
            background: var(--primary);
            color: #fff;
        }
        .step-card h4 { font-size: 1.05rem; margin-bottom: var(--space-xs); }
        .step-card p { color: var(--text-secondary); font-size: 0.9rem; max-width: 220px; margin: 0 auto; }
        .step-card::after {
            content: '';
            position: absolute;
            top: 24px;
            right: -30px;
            width: 60px;
            height: 2px;
            background: var(--border);
            border-top: 2px dashed var(--border);
        }
        .step-card:last-child::after { display: none; }

        /* ===== Features / Highlights ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--space-xl);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .feature-card .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
            margin-bottom: var(--space-md);
        }
        .feature-card .feature-icon.icon1 { background: #8b5cf6; }
        .feature-card .feature-icon.icon2 { background: #ec4899; }
        .feature-card .feature-icon.icon3 { background: #14b8a6; }
        .feature-card .feature-icon.icon4 { background: #f97316; }
        .feature-card .feature-icon.icon5 { background: #06b6d4; }
        .feature-card .feature-icon.icon6 { background: #84cc16; }
        .feature-card h3 { font-size: 1.08rem; margin-bottom: var(--space-xs); }
        .feature-card p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.6; }

        /* ===== Testimonials ===== */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-lg);
        }
        .testimonial-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: var(--space-xl);
            transition: box-shadow var(--transition);
        }
        .testimonial-card:hover { box-shadow: var(--shadow-md); }
        .testimonial-card .stars {
            color: var(--secondary);
            font-size: 0.9rem;
            margin-bottom: var(--space-sm);
            letter-spacing: 2px;
        }
        .testimonial-card blockquote {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            font-style: italic;
            margin-bottom: var(--space-md);
        }
        .testimonial-card .user {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
        }
        .testimonial-card .user img {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid var(--border-light);
        }
        .testimonial-card .user .name { font-weight: 600; font-size: 0.92rem; }
        .testimonial-card .user .title { color: var(--text-muted); font-size: 0.82rem; }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-item summary {
            padding: var(--space-md) var(--space-lg);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-md);
            list-style: none;
            color: var(--text-primary);
            transition: background var(--transition);
        }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary i {
            color: var(--primary);
            transition: transform var(--transition);
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .faq-item[open] summary i { transform: rotate(180deg); }
        .faq-item[open] summary { background: var(--primary-light); }
        .faq-item .faq-answer {
            padding: 0 var(--space-lg) var(--space-md);
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item .faq-answer a { color: var(--primary); text-decoration: underline; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: var(--space-3xl) 0;
            text-align: center;
            color: #fff;
        }
        .cta-section h2 {
            font-size: 2rem;
            color: #fff;
            margin-bottom: var(--space-sm);
        }
        .cta-section p {
            color: rgba(255,255,255,0.85);
            font-size: 1.08rem;
            max-width: 580px;
            margin: 0 auto var(--space-lg);
        }
        .cta-section .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: #fff;
            color: var(--primary);
            padding: 16px 44px;
            border-radius: var(--radius-full);
            font-weight: 700;
            font-size: 1.1rem;
            transition: transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 20px rgba(255,255,255,0.25);
        }
        .cta-section .btn-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 36px rgba(255,255,255,0.35);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.8);
            padding: var(--space-3xl) 0 var(--space-lg);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--space-2xl);
            margin-bottom: var(--space-2xl);
        }
        .footer-brand .logo { color: #fff; margin-bottom: var(--space-md); font-size: 1.3rem; }
        .footer-brand .logo i { color: var(--secondary); }
        .footer-brand p { font-size: 0.92rem; color: rgba(255,255,255,0.6); line-height: 1.7; max-width: 360px; }
        .footer-social { display: flex; gap: var(--space-sm); margin-top: var(--space-md); }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.7);
            transition: background var(--transition), color var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: #fff; }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: var(--space-md);
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.55);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover { color: var(--secondary); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: var(--space-lg);
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--secondary); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .download-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-xl); }
            .step-card::after { display: none; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-xl); }
            .page-banner h1 { font-size: 2.2rem; }
        }
        @media (max-width: 768px) {
            .header-top { flex-wrap: wrap; }
            .header-actions .search-box { display: none; }
            .header-actions .btn-download { padding: 8px 16px; font-size: 0.82rem; }
            .nav-secondary { gap: 4px; }
            .nav-secondary a { padding: 6px 14px; font-size: 0.82rem; }
            .page-banner { padding: var(--space-2xl) 0; }
            .page-banner h1 { font-size: 1.8rem; }
            .page-banner p { font-size: 1rem; }
            .section { padding: var(--space-2xl) 0; }
            .section-header h2 { font-size: 1.6rem; }
            .download-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
            .steps-grid { grid-template-columns: 1fr; max-width: 360px; margin: 0 auto; }
            .features-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
            .testimonials-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
            .footer-grid { grid-template-columns: 1fr; text-align: center; }
            .footer-brand p { margin: 0 auto; }
            .footer-social { justify-content: center; }
            .banner-actions .btn-primary,
            .banner-actions .btn-secondary { padding: 12px 24px; font-size: 0.95rem; }
            .cta-section h2 { font-size: 1.5rem; }
            .cta-section .btn-cta { padding: 14px 32px; font-size: 1rem; }
        }
        @media (max-width: 520px) {
            .container { padding-left: var(--space-md); padding-right: var(--space-md); }
            .page-banner h1 { font-size: 1.5rem; }
            .page-banner p { font-size: 0.92rem; }
            .section-header h2 { font-size: 1.35rem; }
            .header-actions .btn-download { padding: 6px 12px; font-size: 0.78rem; }
            .nav-secondary a { padding: 5px 10px; font-size: 0.78rem; }
            .logo { font-size: 1.1rem; }
            .logo i { font-size: 1.2rem; }
            .banner-badges span { font-size: 0.72rem; padding: 4px 10px; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-1 { margin-top: var(--space-md); }
        .mt-2 { margin-top: var(--space-lg); }
        .mb-1 { margin-bottom: var(--space-md); }
        .mb-2 { margin-bottom: var(--space-lg); }
        .gap-sm { gap: var(--space-sm); }
        .gap-md { gap: var(--space-md); }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .flex-wrap { flex-wrap: wrap; }