/* roulang page: index */
:root {
            --primary: #4f46e5;
            --primary-dark: #4338ca;
            --primary-light: #818cf8;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-light: #f8fafc;
            --bg-dark: #0f172a;
            --bg-card: #ffffff;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --text-light: #94a3b8;
            --border-light: #e2e8f0;
            --shadow-sm: 0 1px 3px 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);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * { margin:0; padding:0; box-sizing:border-box; }
        html { scroll-behavior: smooth; }
        body { font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; background: var(--bg-light); color: var(--text-primary); line-height: 1.6; -webkit-font-smoothing: antialiased; }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; transition: var(--transition); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        .section-padding { padding: 80px 0; }
        .section-title { font-size: 2rem; font-weight: 700; text-align: center; margin-bottom: 12px; color: var(--text-primary); }
        .section-subtitle { font-size: 1.05rem; text-align: center; color: var(--text-secondary); max-width: 600px; margin: 0 auto 48px; }
        .btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem; cursor: pointer; border: none; transition: var(--transition); }
        .btn-primary { background: var(--primary); color: #fff; }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(79,70,229,0.35); }
        .btn-accent { background: var(--accent); color: #fff; }
        .btn-accent:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.35); }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
        .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .btn-white { background: #fff; color: var(--primary); }
        .btn-white:hover { background: var(--bg-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }
        .badge { display: inline-block; padding: 4px 14px; border-radius: 50px; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.02em; }
        .badge-primary { background: rgba(79,70,229,0.1); color: var(--primary); }
        .badge-accent { background: rgba(245,158,11,0.12); color: var(--accent-dark); }
        .badge-green { background: rgba(16,185,129,0.12); color: #059669; }
        .card { background: var(--bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); transition: var(--transition); border: 1px solid var(--border-light); overflow: hidden; }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        /* Header / Nav */
        .site-header { background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border-light); position: sticky; top: 0; z-index: 100; }
        .nav-container { display: flex; align-items: center; justify-content: center; padding: 0 24px; max-width: 1200px; margin: 0 auto; height: 72px; position: relative; }
        .nav-left, .nav-right { display: flex; align-items: center; gap: 32px; flex: 1; }
        .nav-right { justify-content: flex-end; }
        .nav-center { position: absolute; left: 50%; transform: translateX(-50%); }
        .nav-logo { font-size: 1.35rem; font-weight: 800; color: var(--primary); letter-spacing: -0.01em; white-space: nowrap; }
        .nav-logo span { color: var(--accent); }
        .nav-link { font-size: 0.9rem; font-weight: 500; color: var(--text-secondary); padding: 6px 0; position: relative; white-space: nowrap; }
        .nav-link:hover { color: var(--primary); }
        .nav-link.active { color: var(--primary); font-weight: 600; }
        .nav-link.active::after { content: ''; position: absolute; bottom: -2px; left: 0; right: 0; height: 2px; background: var(--primary); border-radius: 2px; }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--text-primary); cursor: pointer; padding: 8px; }
        /* Mobile nav */
        .mobile-menu { display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); z-index: 99; padding: 32px 24px; flex-direction: column; gap: 20px; overflow-y: auto; }
        .mobile-menu.open { display: flex; }
        .mobile-menu .nav-link { font-size: 1.15rem; padding: 12px 0; border-bottom: 1px solid var(--border-light); }
        /* Hero */
        .hero { position: relative; min-height: 620px; display: flex; align-items: center; justify-content: center; text-align: center; background-size: cover; background-position: center; background-repeat: no-repeat; overflow: hidden; }
        .hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,23,42,0.82) 0%, rgba(30,27,75,0.72) 100%); }
        .hero-content { position: relative; z-index: 2; max-width: 800px; padding: 0 24px; }
        .hero-title { font-size: 3.2rem; font-weight: 800; color: #fff; line-height: 1.15; margin-bottom: 20px; letter-spacing: -0.01em; }
        .hero-title span { color: var(--accent); }
        .hero-desc { font-size: 1.15rem; color: rgba(255,255,255,0.85); max-width: 560px; margin: 0 auto 36px; line-height: 1.7; }
        .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .hero-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(255,255,255,0.12); backdrop-filter: blur(8px); padding: 6px 18px; border-radius: 50px; color: rgba(255,255,255,0.9); font-size: 0.85rem; margin-bottom: 24px; border: 1px solid rgba(255,255,255,0.15); }
        /* Features */
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .feature-card { padding: 36px 28px; text-align: center; background: var(--bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--border-light); transition: var(--transition); }
        .feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-6px); }
        .feature-icon { width: 60px; height: 60px; border-radius: 16px; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 1.6rem; color: #fff; }
        .feature-icon.purple { background: linear-gradient(135deg, #4f46e5, #7c3aed); }
        .feature-icon.amber { background: linear-gradient(135deg, #f59e0b, #f97316); }
        .feature-icon.emerald { background: linear-gradient(135deg, #10b981, #059669); }
        .feature-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--text-primary); }
        .feature-card p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
        /* Categories */
        .categories-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .category-card { position: relative; border-radius: var(--radius-md); overflow: hidden; height: 220px; display: flex; align-items: flex-end; background-size: cover; background-position: center; cursor: pointer; transition: var(--transition); }
        .category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .category-card::before { content: ''; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(15,23,42,0.75) 0%, rgba(15,23,42,0.15) 70%, transparent 100%); }
        .category-card-content { position: relative; z-index: 2; padding: 20px 24px; width: 100%; }
        .category-card h3 { color: #fff; font-size: 1.15rem; font-weight: 700; margin-bottom: 4px; }
        .category-card p { color: rgba(255,255,255,0.75); font-size: 0.85rem; }
        /* News / CMS */
        .news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
        .news-card { padding: 0; display: flex; flex-direction: column; }
        .news-card-img { height: 200px; background-size: cover; background-position: center; position: relative; }
        .news-card-img .badge { position: absolute; top: 16px; left: 16px; }
        .news-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
        .news-card-body h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; color: var(--text-primary); }
        .news-card-body h3 a { color: inherit; }
        .news-card-body h3 a:hover { color: var(--primary); }
        .news-card-body p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; flex: 1; }
        .news-meta { display: flex; align-items: center; gap: 16px; font-size: 0.8rem; color: var(--text-light); }
        .news-meta span { display: flex; align-items: center; gap: 4px; }
        .news-empty { grid-column: 1 / -1; text-align: center; padding: 48px 24px; color: var(--text-secondary); font-size: 1.05rem; background: var(--bg-card); border-radius: var(--radius-md); border: 1px dashed var(--border-light); }
        /* Stats */
        .stats-section { background: var(--bg-dark); padding: 80px 0; position: relative; overflow: hidden; }
        .stats-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(79,70,229,0.15) 0%, transparent 70%), radial-gradient(ellipse at 70% 50%, rgba(245,158,11,0.1) 0%, transparent 70%); }
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; position: relative; z-index: 2; }
        .stat-item { text-align: center; padding: 24px; }
        .stat-number { font-size: 2.6rem; font-weight: 800; color: #fff; margin-bottom: 6px; letter-spacing: -0.01em; }
        .stat-number span { color: var(--accent); }
        .stat-label { font-size: 0.95rem; color: rgba(255,255,255,0.7); }
        /* Featured / Recommended */
        .featured-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .featured-card { border-radius: var(--radius-md); overflow: hidden; background: var(--bg-card); box-shadow: var(--shadow-sm); border: 1px solid var(--border-light); transition: var(--transition); }
        .featured-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .featured-card-img { height: 180px; background-size: cover; background-position: center; position: relative; }
        .featured-card-img .badge { position: absolute; top: 14px; left: 14px; }
        .featured-card-body { padding: 20px 22px 24px; }
        .featured-card-body h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
        .featured-card-body p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }
        .featured-card-footer { display: flex; align-items: center; justify-content: space-between; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border-light); font-size: 0.8rem; color: var(--text-light); }
        /* Testimonials */
        .testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .testimonial-card { padding: 32px 28px; background: var(--bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--border-light); transition: var(--transition); }
        .testimonial-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .testimonial-stars { color: var(--accent); font-size: 0.95rem; margin-bottom: 16px; letter-spacing: 2px; }
        .testimonial-text { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; font-style: italic; }
        .testimonial-author { display: flex; align-items: center; gap: 12px; }
        .testimonial-avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--primary-light), var(--primary)); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 0.9rem; }
        .testimonial-name { font-weight: 600; font-size: 0.9rem; color: var(--text-primary); }
        .testimonial-role { font-size: 0.8rem; color: var(--text-light); }
        /* FAQ */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
        .faq-item { background: var(--bg-card); border-radius: var(--radius-sm); border: 1px solid var(--border-light); overflow: hidden; transition: var(--transition); }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question { padding: 20px 24px; font-weight: 600; font-size: 1rem; color: var(--text-primary); cursor: pointer; display: flex; justify-content: space-between; align-items: center; background: none; border: none; width: 100%; text-align: left; }
        .faq-question i { transition: transform 0.3s; color: var(--text-light); font-size: 0.85rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer { padding: 0 24px 20px; font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; display: none; }
        .faq-item.open .faq-answer { display: block; }
        /* CTA */
        .cta-section { background: linear-gradient(135deg, var(--primary) 0%, #4338ca 100%); padding: 80px 0; text-align: center; position: relative; overflow: hidden; }
        .cta-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 70%), radial-gradient(ellipse at 70% 50%, rgba(245,158,11,0.08) 0%, transparent 70%); }
        .cta-content { position: relative; z-index: 2; max-width: 640px; margin: 0 auto; padding: 0 24px; }
        .cta-content h2 { font-size: 2rem; font-weight: 800; color: #fff; margin-bottom: 16px; }
        .cta-content p { color: rgba(255,255,255,0.85); font-size: 1.05rem; margin-bottom: 32px; line-height: 1.7; }
        /* Footer */
        .site-footer { background: var(--bg-dark); padding: 64px 0 0; color: rgba(255,255,255,0.7); }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,0.08); }
        .footer-brand .nav-logo { font-size: 1.5rem; color: #fff; }
        .footer-brand .nav-logo span { color: var(--accent); }
        .footer-brand p { margin-top: 16px; font-size: 0.9rem; line-height: 1.7; max-width: 320px; }
        .footer-col h4 { color: #fff; font-size: 0.95rem; font-weight: 700; margin-bottom: 20px; }
        .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
        .footer-col ul li a { font-size: 0.88rem; color: rgba(255,255,255,0.6); transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
        .footer-bottom { padding: 24px 0; text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.4); display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
        /* Breadcrumb */
        .breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--text-light); padding: 20px 0; flex-wrap: wrap; }
        .breadcrumb a { color: var(--text-secondary); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb span { color: var(--text-light); }
        /* Page Header */
        .page-header { padding: 48px 0 32px; text-align: center; }
        .page-header h1 { font-size: 2.2rem; font-weight: 800; color: var(--text-primary); margin-bottom: 8px; }
        .page-header p { color: var(--text-secondary); max-width: 560px; margin: 0 auto; }
        /* Responsive */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .categories-grid { grid-template-columns: repeat(2, 1fr); }
            .news-grid { grid-template-columns: 1fr; }
            .featured-grid { grid-template-columns: repeat(2, 1fr); }
            .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .hero-title { font-size: 2.6rem; }
        }
        @media (max-width: 768px) {
            .nav-left, .nav-right { display: none; }
            .nav-toggle { display: block; }
            .nav-center { position: relative; left: auto; transform: none; margin: 0 auto; }
            .section-padding { padding: 56px 0; }
            .section-title { font-size: 1.6rem; }
            .section-subtitle { font-size: 0.95rem; margin-bottom: 32px; }
            .hero { min-height: 500px; }
            .hero-title { font-size: 2rem; }
            .hero-desc { font-size: 1rem; }
            .features-grid { grid-template-columns: 1fr; gap: 20px; }
            .categories-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .category-card { height: 170px; }
            .news-grid { grid-template-columns: 1fr; }
            .featured-grid { grid-template-columns: 1fr; gap: 18px; }
            .testimonials-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .stat-number { font-size: 2rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .cta-content h2 { font-size: 1.5rem; }
            .page-header h1 { font-size: 1.6rem; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero-title { font-size: 1.6rem; }
            .categories-grid { grid-template-columns: 1fr; }
            .category-card { height: 150px; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-item { padding: 16px; }
            .stat-number { font-size: 1.6rem; }
            .footer-grid { grid-template-columns: 1fr; }
            .hero-actions { flex-direction: column; align-items: center; }
            .btn { width: 100%; justify-content: center; }
        }
        /* Animations */
        @keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
        .animate-fade-up { animation: fadeInUp 0.6s ease forwards; }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }
        /* Scrollbar */
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: var(--bg-light); }
        ::-webkit-scrollbar-thumb { background: var(--text-light); border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }
        /* Focus */
        a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }

/* roulang page: article */
:root {
            --primary: #3b82f6;
            --primary-dark: #1d4ed8;
            --accent: #d946ef;
            --bg-body: #f8fafc;
            --text-dark: #0f172a;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
            --radius: 16px;
            --radius-sm: 10px;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body { font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif; background: var(--bg-body); color: var(--text-dark); line-height: 1.7; }
        img { max-width: 100%; height: auto; display: block; }
        a { text-decoration: none; color: inherit; transition: color 0.2s; }
        ul, ol { list-style: none; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        /* Header & Navigation */
        .site-header { background: #fff; border-bottom: 1px solid var(--border-light); position: sticky; top: 0; z-index: 100; box-shadow: var(--shadow-sm); }
        .nav-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 72px; position: relative; }
        .nav-left, .nav-right { display: flex; align-items: center; gap: 8px; }
        .nav-link { padding: 8px 16px; border-radius: 8px; font-size: 0.95rem; font-weight: 500; color: var(--text-dark); transition: all 0.2s; white-space: nowrap; }
        .nav-link:hover { background: #f1f5f9; color: var(--primary); }
        .nav-link.active { background: #eff6ff; color: var(--primary); font-weight: 600; }
        .nav-center { position: absolute; left: 50%; transform: translateX(-50%); }
        .nav-logo { font-size: 1.5rem; font-weight: 800; color: #0f172a; letter-spacing: -0.5px; display: flex; align-items: center; gap: 2px; }
        .nav-logo span { color: var(--primary); }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--text-dark); cursor: pointer; padding: 8px; border-radius: 8px; }
        .nav-toggle:hover { background: #f1f5f9; }
        .mobile-menu { display: none; background: #fff; border-top: 1px solid var(--border-light); padding: 12px 24px 20px; flex-direction: column; gap: 6px; }
        .mobile-menu .nav-link { display: block; padding: 10px 16px; border-radius: 8px; }
        @media (max-width: 768px) {
            .nav-left, .nav-right { display: none; }
            .nav-toggle { display: block; }
            .nav-container { height: 64px; }
            .nav-center { position: static; transform: none; }
            .mobile-menu.open { display: flex; }
        }
        /* Article Page */
        .article-banner { position: relative; min-height: 320px; display: flex; align-items: center; justify-content: center; text-align: center; padding: 80px 24px 60px; background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%); overflow: hidden; }
        .article-banner::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.png') center/cover no-repeat; opacity: 0.2; }
        .article-banner .banner-content { position: relative; z-index: 2; max-width: 800px; }
        .article-banner h1 { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800; color: #fff; line-height: 1.3; margin-bottom: 16px; }
        .article-banner .meta { display: flex; flex-wrap: wrap; gap: 16px 24px; justify-content: center; color: rgba(255,255,255,0.7); font-size: 0.95rem; }
        .article-banner .meta span { display: flex; align-items: center; gap: 6px; }
        .article-banner .meta i { color: var(--primary); }
        .article-content { padding: 60px 0 80px; }
        .article-content .content-body { max-width: 800px; margin: 0 auto; background: #fff; border-radius: var(--radius); padding: 48px 56px; box-shadow: var(--shadow-sm); }
        .article-content .content-body p { margin-bottom: 1.5em; font-size: 1.05rem; color: #334155; line-height: 1.85; }
        .article-content .content-body h2, .article-content .content-body h3 { margin-top: 2em; margin-bottom: 0.75em; font-weight: 700; color: #0f172a; }
        .article-content .content-body h2 { font-size: 1.6rem; }
        .article-content .content-body h3 { font-size: 1.3rem; }
        .article-content .content-body ul, .article-content .content-body ol { margin-bottom: 1.5em; padding-left: 1.5em; }
        .article-content .content-body ul li { list-style: disc; margin-bottom: 0.4em; color: #334155; }
        .article-content .content-body ol li { list-style: decimal; margin-bottom: 0.4em; color: #334155; }
        .article-content .content-body img { border-radius: var(--radius-sm); margin: 1.5em 0; box-shadow: var(--shadow-sm); }
        .article-content .content-body blockquote { border-left: 4px solid var(--primary); background: #f8fafc; padding: 16px 24px; margin: 1.5em 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: #475569; font-style: italic; }
        .article-footer { max-width: 800px; margin: 32px auto 0; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; padding: 24px 0; border-top: 1px solid var(--border-light); }
        .article-footer .tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .article-footer .tag { padding: 4px 14px; border-radius: 20px; background: #f1f5f9; color: #475569; font-size: 0.85rem; font-weight: 500; transition: all 0.2s; }
        .article-footer .tag:hover { background: var(--primary); color: #fff; }
        .article-footer .back-link { display: inline-flex; align-items: center; gap: 8px; color: var(--primary); font-weight: 600; font-size: 0.95rem; }
        .article-footer .back-link:hover { color: var(--primary-dark); }
        /* Not Found */
        .not-found { text-align: center; padding: 100px 24px; }
        .not-found .icon { font-size: 4rem; color: #cbd5e1; margin-bottom: 20px; }
        .not-found h2 { font-size: 1.8rem; font-weight: 700; color: #0f172a; margin-bottom: 12px; }
        .not-found p { color: #64748b; margin-bottom: 24px; font-size: 1.05rem; }
        .not-found .btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 32px; background: var(--primary); color: #fff; border-radius: 10px; font-weight: 600; font-size: 1rem; transition: all 0.2s; }
        .not-found .btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
        /* Footer */
        .site-footer { background: #0f172a; color: rgba(255,255,255,0.8); padding: 60px 0 0; }
        .site-footer .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08); }
        .footer-brand .nav-logo { color: #fff; font-size: 1.6rem; margin-bottom: 16px; display: inline-block; }
        .footer-brand .nav-logo span { color: #60a5fa; }
        .footer-brand p { font-size: 0.95rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 360px; }
        .footer-col h4 { color: #fff; font-size: 1.05rem; font-weight: 700; margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.92rem; transition: all 0.2s; display: flex; align-items: center; gap: 8px; }
        .footer-col ul li a:hover { color: #60a5fa; padding-left: 4px; }
        .footer-col ul li a i { width: 18px; color: #60a5fa; }
        .footer-bottom { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 8px; padding: 24px 0; font-size: 0.9rem; color: rgba(255,255,255,0.4); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
            .article-content .content-body { padding: 24px 20px; }
            .article-banner { min-height: 240px; padding: 60px 20px 40px; }
            .article-footer { flex-direction: column; align-items: flex-start; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .article-content .content-body { padding: 20px 16px; }
            .article-content .content-body p { font-size: 0.98rem; }
        }
        /* Additional utilities */
        .badge { display: inline-flex; align-items: center; padding: 4px 14px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; background: #eff6ff; color: var(--primary); }
        .badge-accent { background: #fdf4ff; color: #c026d3; }
        .section-title { font-size: 1.8rem; font-weight: 800; color: #0f172a; margin-bottom: 8px; }
        .section-sub { color: #64748b; font-size: 1.05rem; max-width: 600px; }
        .card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-sm); transition: all 0.3s; overflow: hidden; }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }

/* roulang page: category1 */
:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --primary-light: #a5b4fc;
            --primary-bg: #eef2ff;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --accent: #06b6d4;
            --bg: #0f0f1a;
            --bg-card: #1a1a2e;
            --bg-card-hover: #22223a;
            --bg-section: #151528;
            --text: #f1f5f9;
            --text-muted: #94a3b8;
            --text-light: #cbd5e1;
            --border: #2d2d4a;
            --border-light: #3d3d5c;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-hover: 0 16px 48px rgba(99, 102, 241, 0.25);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
            font: inherit;
            color: inherit;
        }
        input,
        textarea {
            font: inherit;
            color: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(15, 15, 26, 0.92);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
        }

        .site-header.scrolled {
            background: rgba(15, 15, 26, 0.98);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.6);
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            position: relative;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-center {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
        }

        .nav-logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--primary-light), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-logo span {
            background: linear-gradient(135deg, var(--secondary), #f97316);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-logo:hover {
            opacity: 0.85;
        }

        .nav-link {
            padding: 8px 18px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover {
            color: var(--text);
            background: rgba(99, 102, 241, 0.1);
        }
        .nav-link.active {
            color: #fff;
            background: rgba(99, 102, 241, 0.18);
            box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.3);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }

        .nav-toggle {
            display: none;
            font-size: 1.4rem;
            color: var(--text);
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            z-index: 1001;
        }
        .nav-toggle:hover {
            background: rgba(99, 102, 241, 0.15);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: 12px 24px 20px;
            background: rgba(15, 15, 26, 0.98);
            border-bottom: 1px solid var(--border);
            backdrop-filter: blur(16px);
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu .nav-link {
            padding: 12px 16px;
            font-size: 1rem;
        }

        /* ===== Hero ===== */
        .category-hero {
            padding: 140px 0 80px;
            background: linear-gradient(165deg, #0f0f1a 0%, #1a1a3e 40%, #0f0f1a 100%);
            position: relative;
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
            z-index: 1;
        }
        .category-hero .container {
            position: relative;
            z-index: 2;
        }
        .category-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.03em;
            margin-bottom: 20px;
        }
        .category-hero h1 .highlight {
            background: linear-gradient(135deg, var(--primary-light), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .category-hero p {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 680px;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .hero-tag {
            padding: 6px 18px;
            border-radius: 50px;
            background: rgba(99, 102, 241, 0.12);
            border: 1px solid rgba(99, 102, 241, 0.2);
            font-size: 0.85rem;
            color: var(--text-light);
            transition: var(--transition);
        }
        .hero-tag:hover {
            background: rgba(99, 102, 241, 0.2);
            border-color: var(--primary);
            color: #fff;
        }

        /* ===== Section ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section);
        }
        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 14px;
        }
        .section-header h2 .hl {
            background: linear-gradient(135deg, var(--primary-light), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-header p {
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
            margin: 16px auto 0;
        }

        /* ===== Cards ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 28px;
        }
        .card-grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .card-grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-light);
            background: var(--bg-card-hover);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            display: block;
            background: var(--bg-section);
        }
        .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .card-body p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
            margin-bottom: 16px;
            flex: 1;
        }
        .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 14px;
            border-top: 1px solid var(--border);
        }
        .card-tag {
            padding: 4px 14px;
            border-radius: 50px;
            background: rgba(99, 102, 241, 0.1);
            font-size: 0.78rem;
            color: var(--primary-light);
            border: 1px solid rgba(99, 102, 241, 0.15);
        }
        .card-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .card-link {
            color: var(--primary-light);
            font-weight: 500;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }
        .card-link:hover {
            color: #fff;
            gap: 10px;
        }

        /* ===== Button ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(99, 102, 241, 0.5);
        }
        .btn-secondary {
            background: transparent;
            color: var(--text);
            border: 1.5px solid var(--border);
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            background: rgba(99, 102, 241, 0.08);
            color: #fff;
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 1.05rem;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .stat-item:hover {
            border-color: var(--primary);
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary-light), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-label {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* ===== List ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .content-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .content-item:hover {
            border-color: var(--border-light);
            background: var(--bg-card-hover);
            transform: translateX(6px);
        }
        .content-item .item-index {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            opacity: 0.4;
            min-width: 48px;
            text-align: center;
        }
        .content-item .item-info {
            flex: 1;
        }
        .content-item .item-info h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .content-item .item-info p {
            color: var(--text-muted);
            font-size: 0.88rem;
        }
        .content-item .item-badge {
            padding: 4px 14px;
            border-radius: 50px;
            background: rgba(245, 158, 11, 0.12);
            color: var(--secondary);
            font-size: 0.78rem;
            font-weight: 500;
            white-space: nowrap;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-light);
        }
        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            transition: var(--transition);
            user-select: none;
        }
        .faq-question:hover {
            background: rgba(99, 102, 241, 0.05);
        }
        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(165deg, #0f0f1a, #1a1a3e, #0f0f1a);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 70% 50%, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: var(--text-muted);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0a0a14;
            border-top: 1px solid var(--border);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .nav-logo {
            font-size: 1.6rem;
            display: inline-block;
            margin-bottom: 16px;
        }
        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.8;
            max-width: 360px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 18px;
            color: var(--text-light);
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .footer-col ul li a:hover {
            color: var(--primary-light);
            transform: translateX(4px);
        }
        .footer-col ul li a i {
            width: 18px;
            text-align: center;
            font-size: 0.85rem;
            color: var(--primary);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
            color: var(--text-muted);
            font-size: 0.85rem;
            flex-wrap: wrap;
        }

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

        @media (max-width: 768px) {
            .nav-left,
            .nav-right {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .nav-center {
                position: static;
                transform: none;
            }
            .nav-container {
                justify-content: space-between;
            }

            .category-hero {
                padding: 110px 0 60px;
                min-height: auto;
            }
            .category-hero h1 {
                font-size: 2.2rem;
            }
            .category-hero p {
                font-size: 1rem;
            }

            .section {
                padding: 56px 0;
            }
            .section-header h2 {
                font-size: 1.7rem;
            }

            .card-grid-3,
            .card-grid-4 {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-number {
                font-size: 2rem;
            }
            .content-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .content-item .item-index {
                min-width: auto;
                font-size: 1.4rem;
                text-align: left;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .cta-section h2 {
                font-size: 1.7rem;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 0.95rem;
            }
        }

        @media (max-width: 520px) {
            .nav-container {
                padding: 0 16px;
                height: 60px;
            }
            .nav-logo {
                font-size: 1.25rem;
            }
            .category-hero h1 {
                font-size: 1.7rem;
            }
            .hero-tags {
                gap: 6px;
            }
            .hero-tag {
                font-size: 0.75rem;
                padding: 4px 12px;
            }
            .container {
                padding: 0 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .card-body {
                padding: 18px;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 18px;
                font-size: 0.88rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 18px 16px;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--border-light);
        }

        /* ===== Selection ===== */
        ::selection {
            background: var(--primary);
            color: #fff;
        }

        /* ===== Animations ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-up {
            animation: fadeUp 0.7s ease forwards;
        }
        .delay-1 {
            animation-delay: 0.1s;
        }
        .delay-2 {
            animation-delay: 0.2s;
        }
        .delay-3 {
            animation-delay: 0.3s;
        }
        .delay-4 {
            animation-delay: 0.4s;
        }