/* roulang page: index */
:root {
            --primary: #1a56db;
            --primary-dark: #1347b8;
            --primary-light: #e8f0fe;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-soft: #f1f5f9;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.05);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.07), 0 8px 28px rgba(0,0,0,0.06);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.09), 0 16px 48px rgba(0,0,0,0.07);
            --shadow-xl: 0 16px 40px rgba(0,0,0,0.10), 0 24px 64px rgba(0,0,0,0.08);
            --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container: 1240px;
            --nav-height: 64px;
            --tabs-height: 48px;
            --header-total: 112px;
        }

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

        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
        }

        a { text-decoration: none; color: inherit; transition: color var(--transition); }
        img { max-width: 100%; height: auto; display: block; }
        button { cursor: pointer; font-family: var(--font); border: none; outline: none; }
        input { font-family: var(--font); outline: none; }
        ul, ol { list-style: none; }

        .container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

        /* ===== HEADER ===== */
        .site-header { position: sticky; top: 0; z-index: 1000; background: var(--bg-white); border-bottom: 1px solid var(--border); }

        .header-top { display: flex; align-items: center; justify-content: space-between; height: var(--nav-height); padding: 0 24px; max-width: var(--container); margin: 0 auto; }

        .header-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.25rem; color: var(--primary); letter-spacing: -0.01em; white-space: nowrap; }
        .header-logo i { font-size: 1.5rem; color: var(--accent); }
        .header-logo:hover { color: var(--primary-dark); }

        .header-actions { display: flex; align-items: center; gap: 12px; }
        .header-search { position: relative; }
        .header-search input {
            width: 220px; height: 40px; padding: 0 40px 0 16px; border: 2px solid var(--border);
            border-radius: 20px; font-size: 0.9rem; background: var(--bg-soft); transition: all var(--transition);
        }
        .header-search input:focus { border-color: var(--primary); background: var(--bg-white); box-shadow: 0 0 0 3px var(--primary-light); width: 260px; }
        .header-search button {
            position: absolute; right: 6px; top: 50%; transform: translateY(-50%); background: none;
            color: var(--text-weak); font-size: 1rem; padding: 6px; border-radius: 50%; transition: color var(--transition);
        }
        .header-search button:hover { color: var(--primary); }

        .btn-cta-sm {
            display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; background: var(--primary);
            color: #fff; font-weight: 600; font-size: 0.9rem; border-radius: 20px; white-space: nowrap;
            transition: all var(--transition); box-shadow: 0 2px 8px rgba(26,86,219,0.25);
        }
        .btn-cta-sm:hover { background: var(--primary-dark); box-shadow: 0 4px 16px rgba(26,86,219,0.35); transform: translateY(-1px); color: #fff; }

        /* ===== NAV TABS ===== */
        .nav-tabs-bar { background: var(--bg-white); border-top: 1px solid var(--border-light); }
        .nav-tabs-inner { display: flex; align-items: center; gap: 4px; max-width: var(--container); margin: 0 auto; padding: 0 24px; height: var(--tabs-height); overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
        .nav-tabs-inner::-webkit-scrollbar { display: none; }

        .nav-tab {
            display: inline-flex; align-items: center; gap: 6px; padding: 8px 18px; border-radius: 20px;
            font-weight: 500; font-size: 0.9rem; color: var(--text-weak); white-space: nowrap;
            transition: all var(--transition); background: transparent; border: 1.5px solid transparent;
        }
        .nav-tab:hover { color: var(--text); background: var(--bg-soft); }
        .nav-tab.active { color: var(--primary); background: var(--primary-light); border-color: var(--primary); font-weight: 600; }
        .nav-tab i { font-size: 0.85rem; }

        /* ===== MOBILE NAV TOGGLE ===== */
        .mobile-toggle { display: none; background: none; font-size: 1.5rem; color: var(--text); padding: 8px; border-radius: var(--radius-sm); }
        .mobile-toggle:hover { background: var(--bg-soft); }

        /* ===== MAIN ===== */
        .site-main { min-height: 60vh; }

        /* ===== HERO ===== */
        .hero-section {
            position: relative; padding: 72px 0 80px; background: linear-gradient(155deg, #0f172a 0%, #1e3a5f 40%, #1a4b8c 100%);
            overflow: hidden; color: #fff;
        }
        .hero-bg-img {
            position: absolute; top: 0; right: 0; width: 52%; height: 100%; object-fit: cover;
            opacity: 0.28; mask-image: linear-gradient(to left, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.1) 100%);
            -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.1) 100%);
        }
        .hero-overlay { position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(26,86,219,0.18) 0%, transparent 65%); }
        .hero-content { position: relative; z-index: 2; max-width: 620px; }
        .hero-badge {
            display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; background: rgba(255,255,255,0.12);
            border: 1px solid rgba(255,255,255,0.2); border-radius: 20px; font-size: 0.85rem; font-weight: 500;
            color: #fde68a; margin-bottom: 20px; backdrop-filter: blur(6px);
        }
        .hero-badge i { color: var(--accent); }
        .hero-title { font-size: 2.75rem; font-weight: 800; line-height: 1.2; letter-spacing: -0.02em; margin-bottom: 16px; }
        .hero-title span { color: var(--accent); }
        .hero-desc { font-size: 1.1rem; color: rgba(255,255,255,0.82); line-height: 1.7; margin-bottom: 28px; max-width: 500px; }
        .hero-buttons { display: flex; flex-wrap: wrap; gap: 12px; }
        .btn-primary {
            display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; background: var(--primary);
            color: #fff; font-weight: 600; font-size: 1rem; border-radius: 28px; transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(26,86,219,0.4);
        }
        .btn-primary:hover { background: #1d4fd6; box-shadow: 0 6px 24px rgba(26,86,219,0.55); transform: translateY(-2px); color: #fff; }
        .btn-outline-light {
            display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; background: transparent;
            color: #fff; font-weight: 600; font-size: 1rem; border-radius: 28px; border: 2px solid rgba(255,255,255,0.4);
            transition: all var(--transition);
        }
        .btn-outline-light:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.7); color: #fff; }
        .hero-stats { display: flex; gap: 32px; margin-top: 36px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.15); }
        .hero-stat { text-align: left; }
        .hero-stat-num { font-size: 1.6rem; font-weight: 700; color: #fff; }
        .hero-stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.65); margin-top: 2px; }

        /* ===== SECTION ===== */
        .section { padding: 60px 0; }
        .section-header { text-align: center; margin-bottom: 40px; }
        .section-label {
            display: inline-block; padding: 5px 14px; background: var(--primary-light); color: var(--primary);
            font-weight: 600; font-size: 0.85rem; border-radius: 20px; margin-bottom: 12px; letter-spacing: 0.02em;
        }
        .section-title { font-size: 1.75rem; font-weight: 700; color: var(--text); letter-spacing: -0.01em; margin-bottom: 8px; }
        .section-desc { color: var(--text-weak); font-size: 0.95rem; max-width: 560px; margin: 0 auto; }

        /* ===== FEATURE CARDS ===== */
        .feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
        .feature-card {
            background: var(--bg-white); border-radius: var(--radius-lg); padding: 28px 24px;
            border: 1px solid var(--border); transition: all var(--transition); position: relative; overflow: hidden;
        }
        .feature-card::before {
            content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent)); opacity: 0; transition: opacity var(--transition);
        }
        .feature-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); border-color: transparent; }
        .feature-card:hover::before { opacity: 1; }
        .feature-icon {
            width: 48px; height: 48px; border-radius: var(--radius); display: flex; align-items: center;
            justify-content: center; font-size: 1.3rem; margin-bottom: 16px; background: var(--primary-light); color: var(--primary);
        }
        .feature-card:nth-child(2) .feature-icon { background: var(--accent-light); color: var(--accent-dark); }
        .feature-card:nth-child(3) .feature-icon { background: #e0f2fe; color: #0369a1; }
        .feature-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; color: var(--text); }
        .feature-card p { font-size: 0.9rem; color: var(--text-weak); line-height: 1.6; }

        /* ===== CATEGORY ENTRY ===== */
        .category-entry-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
        .category-entry-card {
            display: flex; align-items: center; gap: 28px; background: var(--bg-white); border-radius: var(--radius-lg);
            padding: 28px 32px; border: 1px solid var(--border); transition: all var(--transition); cursor: pointer;
        }
        .category-entry-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--primary); }
        .category-entry-img {
            width: 120px; height: 90px; border-radius: var(--radius); object-fit: cover; flex-shrink: 0;
        }
        .category-entry-info h3 { font-size: 1.15rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
        .category-entry-info p { font-size: 0.9rem; color: var(--text-weak); line-height: 1.5; margin-bottom: 10px; }
        .category-entry-tag {
            display: inline-flex; align-items: center; gap: 4px; padding: 5px 12px; background: var(--primary-light);
            color: var(--primary); font-weight: 600; font-size: 0.8rem; border-radius: 14px;
        }
        .category-entry-tag i { font-size: 0.7rem; }

        /* ===== POST LIST ===== */
        .post-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
        .post-card {
            display: flex; gap: 16px; background: var(--bg-white); border-radius: var(--radius); padding: 16px;
            border: 1px solid var(--border); transition: all var(--transition);
        }
        .post-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: transparent; }
        .post-card-img {
            width: 100px; height: 72px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0;
        }
        .post-card-body { flex: 1; min-width: 0; }
        .post-card-body h4 { font-size: 0.95rem; font-weight: 600; color: var(--text); margin-bottom: 4px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .post-card-body h4 a:hover { color: var(--primary); }
        .post-card-meta { font-size: 0.8rem; color: var(--text-muted); display: flex; gap: 12px; align-items: center; }
        .post-card-tag {
            display: inline-block; padding: 2px 8px; background: var(--bg-soft); border-radius: 10px;
            font-size: 0.75rem; color: var(--text-weak); font-weight: 500;
        }
        .post-empty { text-align: center; padding: 40px 20px; color: var(--text-weak); font-size: 0.95rem; grid-column: 1 / -1; }

        /* ===== STEPS ===== */
        .steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
        .step-card {
            text-align: center; background: var(--bg-white); border-radius: var(--radius-lg); padding: 28px 20px;
            border: 1px solid var(--border); position: relative; transition: all var(--transition);
        }
        .step-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
        .step-number {
            width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
            font-weight: 700; font-size: 1.1rem; margin: 0 auto 14px; color: #fff;
            background: linear-gradient(135deg, var(--primary), #3b82f6);
        }
        .step-card:nth-child(2) .step-number { background: linear-gradient(135deg, #6366f1, #818cf8); }
        .step-card:nth-child(3) .step-number { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
        .step-card:nth-child(4) .step-number { background: linear-gradient(135deg, #10b981, #34d399); }
        .step-card h4 { font-size: 1rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
        .step-card p { font-size: 0.85rem; color: var(--text-weak); line-height: 1.5; }

        /* ===== DATA HIGHLIGHTS ===== */
        .data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
        .data-card {
            text-align: center; background: var(--bg-white); border-radius: var(--radius-lg); padding: 32px 20px;
            border: 1px solid var(--border); transition: all var(--transition);
        }
        .data-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
        .data-num { font-size: 2.2rem; font-weight: 800; color: var(--primary); letter-spacing: -0.02em; }
        .data-card:nth-child(2) .data-num { color: #6366f1; }
        .data-card:nth-child(3) .data-num { color: var(--accent-dark); }
        .data-card:nth-child(4) .data-num { color: #10b981; }
        .data-label { font-size: 0.9rem; color: var(--text-weak); margin-top: 6px; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
        .faq-item { background: var(--bg-white); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; transition: all var(--transition); }
        .faq-item:hover { border-color: #cbd5e1; }
        .faq-question {
            width: 100%; text-align: left; padding: 18px 20px; background: none; font-size: 0.95rem;
            font-weight: 600; color: var(--text); display: flex; align-items: center; justify-content: space-between;
            gap: 12px; transition: all var(--transition);
        }
        .faq-question i { font-size: 0.9rem; color: var(--text-muted); transition: transform var(--transition); }
        .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--primary); }
        .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; }
        .faq-item.open .faq-answer { max-height: 300px; }
        .faq-answer-inner { padding: 0 20px 18px; font-size: 0.9rem; color: var(--text-weak); line-height: 1.6; }

        /* ===== CTA SECTION ===== */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1a4b8c 100%);
            border-radius: var(--radius-xl); padding: 48px 40px; text-align: center; color: #fff; position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; top: -60px; right: -60px; width: 200px; height: 200px;
            background: rgba(245,158,11,0.12); border-radius: 50%; pointer-events: none;
        }
        .cta-section h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 10px; position: relative; z-index: 1; }
        .cta-section p { color: rgba(255,255,255,0.75); margin-bottom: 24px; font-size: 0.95rem; position: relative; z-index: 1; }
        .cta-section .btn-primary { position: relative; z-index: 1; }

        /* ===== FOOTER ===== */
        .site-footer { background: var(--bg-white); border-top: 1px solid var(--border); padding: 40px 0 24px; margin-top: 20px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; margin-bottom: 28px; }
        .footer-brand { font-size: 1.15rem; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
        .footer-desc { font-size: 0.85rem; color: var(--text-weak); line-height: 1.6; max-width: 320px; }
        .footer-col h4 { font-size: 0.9rem; font-weight: 600; color: var(--text); margin-bottom: 12px; }
        .footer-col ul { display: flex; flex-direction: column; gap: 6px; }
        .footer-col ul li a { font-size: 0.85rem; color: var(--text-weak); transition: color var(--transition); }
        .footer-col ul li a:hover { color: var(--primary); }
        .footer-bottom { padding-top: 20px; border-top: 1px solid var(--border-light); text-align: center; font-size: 0.8rem; color: var(--text-muted); }

        /* ===== BACK TO TOP ===== */
        .back-to-top {
            position: fixed; bottom: 28px; right: 28px; width: 44px; height: 44px; border-radius: 50%;
            background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center;
            font-size: 1.1rem; box-shadow: var(--shadow-md); z-index: 999; transition: all var(--transition);
            opacity: 0; pointer-events: none; transform: translateY(10px);
        }
        .back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
        .back-to-top:hover { background: var(--primary-dark); box-shadow: var(--shadow-lg); transform: translateY(-3px); }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 1024px) {
            .hero-title { font-size: 2.2rem; }
            .feature-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .data-grid { grid-template-columns: repeat(2, 1fr); }
            .post-list { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .hero-bg-img { width: 60%; opacity: 0.2; }
        }

        @media (max-width: 768px) {
            .header-top { padding: 0 16px; }
            .header-search input { width: 160px; }
            .header-search input:focus { width: 190px; }
            .hero-section { padding: 48px 0 56px; }
            .hero-title { font-size: 1.75rem; }
            .hero-desc { font-size: 0.95rem; }
            .hero-stats { gap: 20px; flex-wrap: wrap; }
            .hero-bg-img { width: 80%; opacity: 0.14; }
            .feature-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr 1fr; }
            .data-grid { grid-template-columns: repeat(2, 1fr); }
            .category-entry-card { flex-direction: column; text-align: center; padding: 20px; }
            .category-entry-img { width: 100%; height: 140px; }
            .post-card { flex-direction: column; }
            .post-card-img { width: 100%; height: 140px; }
            .footer-grid { grid-template-columns: 1fr; gap: 20px; }
            .section { padding: 40px 0; }
            .section-title { font-size: 1.4rem; }
            .cta-section { padding: 32px 20px; border-radius: var(--radius-lg); }
            .mobile-toggle { display: block; }
            .header-search { display: none; }
            .btn-cta-sm { padding: 8px 14px; font-size: 0.8rem; }
        }

        @media (max-width: 520px) {
            .hero-title { font-size: 1.5rem; }
            .hero-buttons { flex-direction: column; }
            .hero-buttons .btn-primary, .hero-buttons .btn-outline-light { width: 100%; justify-content: center; }
            .hero-stats { gap: 14px; }
            .steps-grid { grid-template-columns: 1fr; }
            .data-grid { grid-template-columns: 1fr; }
            .nav-tab { padding: 6px 12px; font-size: 0.8rem; }
            .header-logo { font-size: 1.05rem; }
            .container { padding: 0 14px; }
            .section-title { font-size: 1.25rem; }
        }

/* roulang page: article */
:root {
            --color-primary: #1a73e8;
            --color-primary-dark: #1557b0;
            --color-primary-light: #e8f0fe;
            --color-accent: #0ea5e9;
            --color-accent-light: #e0f2fe;
            --color-bg: #f8fafc;
            --color-surface: #ffffff;
            --color-text: #1e293b;
            --color-text-secondary: #64748b;
            --color-text-muted: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-danger: #ef4444;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.09), 0 4px 8px rgba(0,0,0,0.04);
            --shadow-xl: 0 20px 48px rgba(0,0,0,0.11), 0 8px 16px rgba(0,0,0,0.05);
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
            --max-width: 1280px;
            --max-width-content: 820px;
            --header-height-top: 56px;
            --header-height-tabs: 46px;
            --header-height-total: 102px;
        }

        *, *::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(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary-dark);
            text-decoration: underline;
        }
        a:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
            border-radius: 3px;
        }

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

        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        button:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        ul, ol {
            list-style: none;
        }

        h1, h2, h3, h4, h5, h6 {
            line-height: 1.3;
            color: var(--color-text);
            font-weight: 700;
        }

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

        /* Header - Top Bar */
        .header-top {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            height: var(--header-height-top);
            position: sticky;
            top: 0;
            z-index: 1000;
            display: flex;
            align-items: center;
        }
        .header-top .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .header-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text);
            white-space: nowrap;
            flex-shrink: 0;
            text-decoration: none;
        }
        .header-brand:hover {
            color: var(--color-primary);
            text-decoration: none;
        }
        .header-brand .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .header-search {
            display: flex;
            align-items: center;
            gap: 0;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: 50px;
            overflow: hidden;
            flex: 1;
            max-width: 420px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .header-search:focus-within {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
        }
        .header-search input {
            flex: 1;
            border: none;
            background: transparent;
            padding: 10px 16px;
            font-size: 0.9rem;
            color: var(--color-text);
            min-width: 0;
        }
        .header-search input::placeholder {
            color: var(--color-text-muted);
        }
        .header-search input:focus {
            outline: none;
        }
        .header-search button {
            padding: 10px 16px;
            color: var(--color-text-secondary);
            transition: color var(--transition-fast);
            flex-shrink: 0;
        }
        .header-search button:hover {
            color: var(--color-primary);
        }
        .header-cta-sm {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 18px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 600;
            white-space: nowrap;
            flex-shrink: 0;
            transition: background var(--transition-fast), box-shadow var(--transition-fast);
            text-decoration: none;
        }
        .header-cta-sm:hover {
            background: var(--color-primary-dark);
            box-shadow: var(--shadow-md);
            color: #fff;
            text-decoration: none;
        }

        /* Header - Nav Tabs Bar */
        .nav-tabs-bar {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: var(--header-height-top);
            z-index: 999;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .nav-tabs-bar::-webkit-scrollbar {
            display: none;
        }
        .nav-tabs-inner {
            display: flex;
            align-items: center;
            gap: 4px;
            padding: 6px 24px;
            max-width: var(--max-width);
            margin: 0 auto;
            min-width: max-content;
        }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            white-space: nowrap;
            transition: all var(--transition-fast);
            text-decoration: none;
            position: relative;
        }
        .nav-tab:hover {
            background: var(--color-bg);
            color: var(--color-text);
            text-decoration: none;
        }
        .nav-tab.active {
            background: var(--color-primary-light);
            color: var(--color-primary);
            font-weight: 600;
        }
        .nav-tab i {
            font-size: 0.85rem;
        }

        /* Main Layout */
        .main-content {
            flex: 1;
            padding: 32px 0 60px;
        }
        .content-layout {
            display: grid;
            grid-template-columns: 1fr 340px;
            gap: 36px;
            align-items: start;
        }

        /* Article Main */
        .article-main {
            min-width: 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: var(--color-text-muted);
            margin-bottom: 18px;
        }
        .breadcrumb a {
            color: var(--color-text-secondary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .breadcrumb a:hover {
            color: var(--color-primary);
            text-decoration: none;
        }
        .breadcrumb .separator {
            color: var(--color-text-muted);
            font-size: 0.7rem;
        }
        .breadcrumb .current {
            color: var(--color-text);
            font-weight: 500;
        }

        .article-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .article-featured-image {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            background: var(--color-bg);
            border-bottom: 1px solid var(--color-border-light);
        }
        .article-body {
            padding: 32px 36px 40px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 16px;
            font-size: 0.85rem;
            color: var(--color-text-secondary);
        }
        .article-meta .meta-tag {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 4px 12px;
            background: var(--color-accent-light);
            color: var(--color-accent);
            border-radius: 50px;
            font-weight: 500;
            font-size: 0.8rem;
        }
        .article-meta .meta-dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--color-text-muted);
            flex-shrink: 0;
        }
        .article-title {
            font-size: 1.85rem;
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: 20px;
            color: var(--color-text);
            letter-spacing: -0.01em;
        }
        .article-content {
            font-size: 1rem;
            line-height: 1.85;
            color: var(--color-text);
        }
        .article-content h2 {
            font-size: 1.35rem;
            margin-top: 32px;
            margin-bottom: 14px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--color-border-light);
        }
        .article-content h3 {
            font-size: 1.15rem;
            margin-top: 24px;
            margin-bottom: 10px;
        }
        .article-content p {
            margin-bottom: 14px;
        }
        .article-content ul, .article-content ol {
            margin-bottom: 14px;
            padding-left: 20px;
        }
        .article-content ul {
            list-style: disc;
        }
        .article-content ol {
            list-style: decimal;
        }
        .article-content li {
            margin-bottom: 6px;
        }
        .article-content strong {
            font-weight: 600;
            color: var(--color-text);
        }
        .article-content blockquote {
            border-left: 3px solid var(--color-primary);
            padding: 12px 18px;
            margin: 20px 0;
            background: var(--color-primary-light);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--color-text-secondary);
            font-style: italic;
        }
        .article-content code {
            background: var(--color-bg);
            padding: 2px 7px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.88em;
            border: 1px solid var(--color-border-light);
        }
        .article-content pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 18px 20px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 18px 0;
            font-family: var(--font-mono);
            font-size: 0.88rem;
            line-height: 1.6;
        }
        .article-content pre code {
            background: transparent;
            border: none;
            padding: 0;
            color: inherit;
        }
        .article-content img {
            border-radius: var(--radius-md);
            margin: 18px 0;
            max-width: 100%;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 18px 0;
            font-size: 0.9rem;
        }
        .article-content table th,
        .article-content table td {
            border: 1px solid var(--color-border);
            padding: 10px 14px;
            text-align: left;
        }
        .article-content table th {
            background: var(--color-bg);
            font-weight: 600;
        }
        .article-content table tr:nth-child(even) td {
            background: #fafbfc;
        }

        .article-footer-meta {
            margin-top: 28px;
            padding-top: 18px;
            border-top: 1px solid var(--color-border-light);
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }
        .tag-pill {
            display: inline-flex;
            align-items: center;
            padding: 5px 13px;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: 50px;
            font-size: 0.8rem;
            color: var(--color-text-secondary);
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .tag-pill:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: var(--color-primary-light);
            text-decoration: none;
        }

        /* Sidebar */
        .article-sidebar {
            position: sticky;
            top: calc(var(--header-height-total) + 28px);
            display: flex;
            flex-direction: column;
            gap: 22px;
        }
        .sidebar-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            padding: 22px 20px;
            box-shadow: var(--shadow-xs);
        }
        .sidebar-card h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 14px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--color-border-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h4 i {
            color: var(--color-primary);
            font-size: 0.85rem;
        }
        .sidebar-nav-list li {
            padding: 8px 0;
            border-bottom: 1px solid var(--color-border-light);
        }
        .sidebar-nav-list li:last-child {
            border-bottom: none;
        }
        .sidebar-nav-list a {
            font-size: 0.88rem;
            color: var(--color-text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
            transition: color var(--transition-fast);
        }
        .sidebar-nav-list a:hover {
            color: var(--color-primary);
            text-decoration: none;
        }
        .sidebar-nav-list a::before {
            content: '';
            width: 5px;
            height: 5px;
            border-radius: 50%;
            background: var(--color-text-muted);
            flex-shrink: 0;
            transition: background var(--transition-fast);
        }
        .sidebar-nav-list a:hover::before {
            background: var(--color-primary);
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .tag-cloud .tag-pill-sm {
            display: inline-block;
            padding: 4px 11px;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: 50px;
            font-size: 0.78rem;
            color: var(--color-text-secondary);
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .tag-cloud .tag-pill-sm:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: var(--color-primary-light);
            text-decoration: none;
            transform: translateY(-1px);
        }
        .sidebar-guide-card {
            background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
            border-radius: var(--radius-lg);
            padding: 22px 20px;
            border: 1px solid rgba(26,115,232,0.15);
            text-align: center;
        }
        .sidebar-guide-card h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--color-primary-dark);
        }
        .sidebar-guide-card p {
            font-size: 0.83rem;
            color: var(--color-text-secondary);
            margin-bottom: 14px;
        }
        .sidebar-guide-card .btn-guide {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 20px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .sidebar-guide-card .btn-guide:hover {
            background: var(--color-primary-dark);
            box-shadow: var(--shadow-md);
            color: #fff;
            text-decoration: none;
            transform: translateY(-1px);
        }
        .sidebar-related-item {
            display: flex;
            gap: 10px;
            padding: 10px 0;
            border-bottom: 1px solid var(--color-border-light);
            align-items: flex-start;
        }
        .sidebar-related-item:last-child {
            border-bottom: none;
        }
        .sidebar-related-thumb {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--color-bg);
            border: 1px solid var(--color-border-light);
        }
        .sidebar-related-info {
            min-width: 0;
        }
        .sidebar-related-info a {
            font-size: 0.84rem;
            font-weight: 500;
            color: var(--color-text);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color var(--transition-fast);
        }
        .sidebar-related-info a:hover {
            color: var(--color-primary);
            text-decoration: none;
        }
        .sidebar-related-info .related-date {
            font-size: 0.75rem;
            color: var(--color-text-muted);
            margin-top: 3px;
        }

        /* Not Found State */
        .not-found-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            padding: 60px 40px;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }
        .not-found-icon {
            font-size: 4rem;
            color: var(--color-text-muted);
            margin-bottom: 20px;
        }
        .not-found-card h2 {
            font-size: 1.6rem;
            margin-bottom: 10px;
        }
        .not-found-card p {
            color: var(--color-text-secondary);
            margin-bottom: 24px;
            font-size: 0.95rem;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 11px 24px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .btn-primary:hover {
            background: var(--color-primary-dark);
            box-shadow: var(--shadow-md);
            color: #fff;
            text-decoration: none;
            transform: translateY(-1px);
        }

        /* Related Articles Section */
        .related-section {
            margin-top: 36px;
        }
        .related-section h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-section h3 i {
            color: var(--color-primary);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        .related-card {
            background: var(--color-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            box-shadow: var(--shadow-xs);
            transition: all var(--transition-normal);
            text-decoration: none;
            display: block;
        }
        .related-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            text-decoration: none;
            border-color: var(--color-primary);
        }
        .related-card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            background: var(--color-bg);
            border-bottom: 1px solid var(--color-border-light);
        }
        .related-card-body {
            padding: 14px 16px 16px;
        }
        .related-card-body h5 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 6px;
        }
        .related-card-body .related-card-date {
            font-size: 0.75rem;
            color: var(--color-text-muted);
        }
        .related-card:hover .related-card-body h5 {
            color: var(--color-primary);
        }

        /* FAQ Section */
        .faq-section {
            margin-top: 40px;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            padding: 32px 36px;
            box-shadow: var(--shadow-sm);
        }
        .faq-section h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .faq-section h3 i {
            color: var(--color-warning);
        }
        .faq-item {
            border-bottom: 1px solid var(--color-border-light);
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-item summary {
            padding: 16px 0;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--color-text);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            user-select: none;
            transition: color var(--transition-fast);
        }
        .faq-item summary:hover {
            color: var(--color-primary);
        }
        .faq-item summary::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.8rem;
            color: var(--color-text-muted);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item[open] summary {
            color: var(--color-primary);
        }
        .faq-item .faq-answer {
            padding: 0 0 16px;
            font-size: 0.9rem;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }

        /* CTA Section */
        .cta-section {
            margin-top: 40px;
            background: linear-gradient(135deg, #1a73e8 0%, #0ea5e9 100%);
            border-radius: var(--radius-xl);
            padding: 44px 40px;
            text-align: center;
            color: #fff;
            box-shadow: var(--shadow-lg);
        }
        .cta-section h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: #fff;
        }
        .cta-section p {
            font-size: 1rem;
            margin-bottom: 22px;
            opacity: 0.92;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-light {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 12px 28px;
            background: #fff;
            color: var(--color-primary);
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .btn-light:hover {
            background: #f0f4ff;
            box-shadow: 0 8px 24px rgba(0,0,0,0.18);
            color: var(--color-primary-dark);
            text-decoration: none;
            transform: translateY(-2px);
        }

        /* Footer */
        .site-footer {
            background: #1e293b;
            color: #cbd5e1;
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-desc {
            font-size: 0.88rem;
            line-height: 1.7;
            color: #94a3b8;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 14px;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: #94a3b8;
            font-size: 0.85rem;
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: #fff;
            text-decoration: none;
        }
        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 20px;
            text-align: center;
            font-size: 0.82rem;
            color: #64748b;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .content-layout {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .article-sidebar {
                position: static;
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .article-body {
                padding: 24px 20px 28px;
            }
            .article-title {
                font-size: 1.55rem;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .faq-section {
                padding: 24px 20px;
            }
            .cta-section {
                padding: 32px 24px;
            }
            .header-search {
                max-width: 280px;
            }
        }

        @media (max-width: 768px) {
            .header-top .container {
                gap: 10px;
            }
            .header-brand {
                font-size: 1rem;
            }
            .header-brand .brand-icon {
                width: 32px;
                height: 32px;
                font-size: 0.9rem;
            }
            .header-search {
                max-width: 200px;
            }
            .header-search input {
                padding: 8px 12px;
                font-size: 0.82rem;
            }
            .header-cta-sm {
                padding: 7px 14px;
                font-size: 0.8rem;
            }
            .nav-tab {
                padding: 6px 13px;
                font-size: 0.82rem;
                gap: 5px;
            }
            .nav-tab i {
                font-size: 0.75rem;
            }
            .article-body {
                padding: 18px 14px 22px;
            }
            .article-title {
                font-size: 1.35rem;
            }
            .article-meta {
                gap: 8px;
                font-size: 0.78rem;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .faq-section {
                padding: 20px 14px;
            }
            .faq-item summary {
                font-size: 0.88rem;
                padding: 12px 0;
            }
            .cta-section {
                padding: 28px 18px;
                border-radius: var(--radius-lg);
            }
            .cta-section h3 {
                font-size: 1.25rem;
            }
            .cta-section p {
                font-size: 0.9rem;
            }
            .main-content {
                padding: 20px 0 40px;
            }
            .not-found-card {
                padding: 40px 20px;
            }
            .not-found-icon {
                font-size: 3rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 14px;
                padding-right: 14px;
            }
            .header-search {
                max-width: 140px;
            }
            .header-search input {
                font-size: 0.78rem;
                padding: 7px 10px;
            }
            .header-search button {
                padding: 8px 10px;
            }
            .header-cta-sm {
                display: none;
            }
            .header-brand {
                font-size: 0.9rem;
                gap: 6px;
            }
            .header-brand .brand-icon {
                width: 28px;
                height: 28px;
                font-size: 0.8rem;
                border-radius: var(--radius-sm);
            }
            .article-title {
                font-size: 1.2rem;
            }
            .article-content {
                font-size: 0.9rem;
                line-height: 1.7;
            }
            .article-content h2 {
                font-size: 1.15rem;
            }
            .article-content h3 {
                font-size: 1rem;
            }
            .breadcrumb {
                font-size: 0.78rem;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #1a3c5e;
            --color-primary-light: #2b5f8e;
            --color-primary-lighter: #3b7db8;
            --color-accent: #d4a853;
            --color-accent-hover: #c4963d;
            --color-accent-light: #fdf3e0;
            --color-bg: #f6f7f9;
            --color-surface: #ffffff;
            --color-text: #1e293b;
            --color-text-secondary: #5a6b7c;
            --color-text-muted: #8899a8;
            --color-border: #e2e8f0;
            --color-border-light: #edf2f7;
            --color-success: #10b981;
            --color-info: #3b82f6;
            --color-warning: #f59e0b;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 8px 32px rgba(0,0,0,0.10);
            --shadow-xl: 0 12px 48px rgba(0,0,0,0.12);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
            --spacing-xs: 4px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
            --spacing-2xl: 48px;
            --spacing-3xl: 64px;
            --header-height-row1: 56px;
            --header-height-row2: 48px;
            --header-total: 104px;
            --max-width: 1200px;
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s ease;
        }

        *,*::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:1.65;color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
        img{max-width:100%;height:auto;display:block}
        a{text-decoration:none;color:inherit;transition:color var(--transition-fast)}
        button,input,select,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}
        .container{max-width:var(--max-width);margin:0 auto;padding:0 var(--spacing-lg)}
        @media(max-width:768px){.container{padding:0 var(--spacing-md)}}

        /* Header */
        .site-header{position:sticky;top:0;z-index:100;background:var(--color-surface);box-shadow:var(--shadow-sm);border-bottom:1px solid var(--color-border-light)}
        .header-row1{display:flex;align-items:center;justify-content:space-between;height:var(--header-height-row1);padding:0 var(--spacing-lg);max-width:var(--max-width);margin:0 auto}
        .header-logo{font-size:1.25rem;font-weight:800;color:var(--color-primary);letter-spacing:-0.01em;white-space:nowrap;display:flex;align-items:center;gap:var(--spacing-sm)}
        .header-logo i{color:var(--color-accent);font-size:1.35rem}
        .header-logo:hover{color:var(--color-primary-light)}
        .header-actions{display:flex;align-items:center;gap:var(--spacing-md)}
        .header-search{display:flex;align-items:center;background:var(--color-bg);border-radius:var(--radius-xl);padding:6px 14px;border:2px solid transparent;transition:all var(--transition-fast);gap:8px}
        .header-search:focus-within{border-color:var(--color-primary-lighter);background:var(--color-surface);box-shadow:var(--shadow-xs)}
        .header-search input{border:none;background:transparent;outline:none;font-size:0.9rem;color:var(--color-text);width:180px;min-width:120px}
        .header-search input::placeholder{color:var(--color-text-muted)}
        .header-search button{background:none;border:none;cursor:pointer;color:var(--color-text-muted);font-size:0.95rem;padding:4px 6px;border-radius:var(--radius-sm);transition:color var(--transition-fast)}
        .header-search button:hover{color:var(--color-primary-lighter)}
        .header-cta-btn{display:inline-flex;align-items:center;gap:6px;background:var(--color-accent);color:#fff;padding:8px 18px;border-radius:var(--radius-xl);font-weight:600;font-size:0.9rem;white-space:nowrap;transition:all var(--transition-fast);border:none;cursor:pointer}
        .header-cta-btn:hover{background:var(--color-accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-sm)}
        .header-cta-btn:active{transform:translateY(0)}

        /* Nav Tabs Row */
        .nav-tabs-bar{border-top:1px solid var(--color-border-light);background:var(--color-surface);overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
        .nav-tabs-bar::-webkit-scrollbar{display:none}
        .nav-tabs-inner{display:flex;align-items:center;gap:2px;max-width:var(--max-width);margin:0 auto;padding:0 var(--spacing-lg);min-height:var(--header-height-row2)}
        .nav-tab{display:inline-flex;align-items:center;gap:6px;padding:10px 18px;border-radius:var(--radius-md) var(--radius-md) 0 0;font-size:0.9rem;font-weight:600;color:var(--color-text-secondary);white-space:nowrap;transition:all var(--transition-fast);position:relative;border-bottom:3px solid transparent;margin-bottom:-1px}
        .nav-tab i{font-size:0.85rem;opacity:0.7}
        .nav-tab:hover{color:var(--color-primary);background:rgba(26,60,94,0.03)}
        .nav-tab.active{color:var(--color-primary);border-bottom-color:var(--color-accent);background:rgba(26,60,94,0.04)}
        .nav-tab.active i{opacity:1;color:var(--color-accent)}

        /* Mobile nav toggle */
        .mobile-menu-toggle{display:none;background:none;border:none;cursor:pointer;font-size:1.4rem;color:var(--color-text);padding:6px;border-radius:var(--radius-sm)}
        .mobile-menu-toggle:hover{color:var(--color-primary-lighter);background:var(--color-bg)}

        @media(max-width:768px){
            .header-row1{height:50px;padding:0 var(--spacing-md)}
            .header-logo{font-size:1.05rem}
            .header-logo i{font-size:1.1rem}
            .header-search{display:none}
            .header-cta-btn{padding:6px 14px;font-size:0.82rem}
            .nav-tabs-inner{padding:0 var(--spacing-sm);gap:0}
            .nav-tab{padding:8px 14px;font-size:0.82rem;border-radius:var(--radius-sm) var(--radius-sm) 0 0}
            .nav-tab i{font-size:0.75rem}
            .mobile-menu-toggle{display:block}
            .header-search-mobile{display:block;padding:var(--spacing-sm) var(--spacing-md);background:var(--color-bg);border-bottom:1px solid var(--color-border-light)}
            .header-search-mobile .header-search{display:flex;width:100%}
            .header-search-mobile .header-search input{width:100%}
            .header-search-mobile.hidden{display:none}
            .nav-tabs-bar.mobile-hidden{display:none}
        }
        @media(max-width:520px){
            .header-logo{font-size:0.95rem;letter-spacing:0}
            .header-cta-btn{font-size:0.78rem;padding:6px 12px;gap:4px}
            .nav-tab{padding:7px 10px;font-size:0.78rem;gap:4px}
            .nav-tab i{font-size:0.7rem}
        }

        /* Breadcrumb */
        .breadcrumb-bar{background:var(--color-surface);border-bottom:1px solid var(--color-border-light);padding:10px 0}
        .breadcrumb{display:flex;align-items:center;gap:8px;font-size:0.85rem;color:var(--color-text-muted);flex-wrap:wrap}
        .breadcrumb a{color:var(--color-text-secondary);transition:color var(--transition-fast)}
        .breadcrumb a:hover{color:var(--color-primary-lighter)}
        .breadcrumb .sep{color:var(--color-border);font-size:0.7rem}
        .breadcrumb .current{color:var(--color-primary);font-weight:600}

        /* Category Hero */
        .category-hero{position:relative;background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-light) 40%,#1a3c5e 100%);overflow:hidden;padding:var(--spacing-3xl) 0;color:#fff}
        .category-hero::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;opacity:0.18;mix-blend-mode:overlay}
        .category-hero::after{content:'';position:absolute;bottom:0;left:0;right:0;height:80px;background:linear-gradient(to top,var(--color-bg),transparent)}
        .category-hero-content{position:relative;z-index:2;max-width:var(--max-width);margin:0 auto;padding:0 var(--spacing-lg);text-align:center}
        .category-hero-badge{display:inline-block;background:rgba(255,255,255,0.18);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,0.25);padding:6px 16px;border-radius:var(--radius-xl);font-size:0.85rem;font-weight:600;letter-spacing:0.04em;margin-bottom:var(--spacing-lg)}
        .category-hero h1{font-size:2.6rem;font-weight:800;margin-bottom:var(--spacing-md);letter-spacing:-0.02em;line-height:1.2}
        .category-hero p{font-size:1.15rem;max-width:680px;margin:0 auto var(--spacing-xl);opacity:0.9;line-height:1.7}
        .category-hero-stats{display:flex;justify-content:center;gap:var(--spacing-2xl);flex-wrap:wrap}
        .cat-stat-item{text-align:center;background:rgba(255,255,255,0.1);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border-radius:var(--radius-lg);padding:var(--spacing-lg) var(--spacing-xl);border:1px solid rgba(255,255,255,0.2);min-width:120px}
        .cat-stat-num{font-size:2rem;font-weight:800;color:var(--color-accent);line-height:1}
        .cat-stat-label{font-size:0.85rem;opacity:0.85;margin-top:6px}
        @media(max-width:768px){
            .category-hero{padding:var(--spacing-2xl) 0}
            .category-hero h1{font-size:1.8rem}
            .category-hero p{font-size:1rem;max-width:100%}
            .category-hero-stats{gap:var(--spacing-md)}
            .cat-stat-item{padding:var(--spacing-md);min-width:90px}
            .cat-stat-num{font-size:1.5rem}
        }
        @media(max-width:520px){
            .category-hero h1{font-size:1.5rem}
            .category-hero p{font-size:0.9rem}
            .cat-stat-num{font-size:1.3rem}
            .cat-stat-label{font-size:0.75rem}
        }

        /* Main Content Area */
        .category-main{padding:var(--spacing-3xl) 0}
        .category-layout{display:grid;grid-template-columns:280px 1fr;gap:var(--spacing-2xl);align-items:start}
        @media(max-width:1024px){
            .category-layout{grid-template-columns:240px 1fr;gap:var(--spacing-xl)}
        }
        @media(max-width:768px){
            .category-layout{grid-template-columns:1fr;gap:var(--spacing-xl)}
        }

        /* Sidebar */
        .category-sidebar{position:sticky;top:calc(var(--header-total) + 20px)}
        .sidebar-card{background:var(--color-surface);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-xs);border:1px solid var(--color-border-light);margin-bottom:var(--spacing-lg)}
        .sidebar-card h3{font-size:1rem;font-weight:700;margin-bottom:var(--spacing-md);color:var(--color-primary);display:flex;align-items:center;gap:8px}
        .sidebar-card h3 i{color:var(--color-accent);font-size:0.9rem}
        .sidebar-search-wrap{position:relative}
        .sidebar-search-wrap input{width:100%;padding:10px 14px 10px 38px;border:2px solid var(--color-border);border-radius:var(--radius-md);font-size:0.9rem;color:var(--color-text);background:var(--color-bg);transition:all var(--transition-fast);outline:none}
        .sidebar-search-wrap input:focus{border-color:var(--color-primary-lighter);background:var(--color-surface);box-shadow:0 0 0 3px rgba(59,125,184,0.08)}
        .sidebar-search-wrap i{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--color-text-muted);font-size:0.85rem}
        .sidebar-tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
        .sidebar-tag{display:inline-block;padding:5px 12px;background:var(--color-bg);border-radius:var(--radius-xl);font-size:0.8rem;color:var(--color-text-secondary);font-weight:500;transition:all var(--transition-fast);border:1px solid transparent;cursor:pointer}
        .sidebar-tag:hover{background:var(--color-accent-light);color:var(--color-accent-hover);border-color:var(--color-accent)}
        .sidebar-tag.active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}
        .sidebar-link-list li{border-bottom:1px solid var(--color-border-light)}
        .sidebar-link-list li:last-child{border-bottom:none}
        .sidebar-link-list a{display:flex;align-items:center;gap:8px;padding:10px 0;font-size:0.9rem;color:var(--color-text-secondary);transition:all var(--transition-fast)}
        .sidebar-link-list a:hover{color:var(--color-primary-lighter);padding-left:4px}
        .sidebar-link-list a i{font-size:0.75rem;color:var(--color-accent)}
        @media(max-width:768px){
            .category-sidebar{position:static;display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-md)}
            .sidebar-card{margin-bottom:0}
        }
        @media(max-width:520px){
            .category-sidebar{grid-template-columns:1fr}
        }

        /* Guide Cards Grid */
        .guides-section-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:var(--spacing-md);margin-bottom:var(--spacing-xl)}
        .guides-section-header h2{font-size:1.5rem;font-weight:800;color:var(--color-primary)}
        .guides-sort{display:flex;gap:4px;background:var(--color-bg);border-radius:var(--radius-md);padding:3px}
        .guides-sort-btn{padding:7px 14px;border-radius:var(--radius-sm);font-size:0.82rem;font-weight:600;color:var(--color-text-secondary);border:none;background:transparent;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}
        .guides-sort-btn.active,.guides-sort-btn:hover{background:var(--color-surface);color:var(--color-primary);box-shadow:var(--shadow-xs)}
        .guides-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--spacing-lg)}
        @media(max-width:520px){.guides-grid{grid-template-columns:1fr}}

        .guide-card{background:var(--color-surface);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xs);border:1px solid var(--color-border-light);transition:all var(--transition-normal);display:flex;flex-direction:column}
        .guide-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--color-border)}
        .guide-card-image{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--color-bg)}
        .guide-card-image img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-slow)}
        .guide-card:hover .guide-card-image img{transform:scale(1.04)}
        .guide-card-tags{position:absolute;top:12px;left:12px;display:flex;gap:6px;flex-wrap:wrap}
        .guide-card-tag{display:inline-block;padding:3px 10px;background:rgba(255,255,255,0.92);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);border-radius:var(--radius-xl);font-size:0.73rem;font-weight:600;color:var(--color-primary);border:1px solid rgba(255,255,255,0.6)}
        .guide-card-body{padding:var(--spacing-lg);flex:1;display:flex;flex-direction:column}
        .guide-card-body h3{font-size:1.08rem;font-weight:700;margin-bottom:var(--spacing-sm);color:var(--color-text);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
        .guide-card-body h3 a{color:inherit;transition:color var(--transition-fast)}
        .guide-card-body h3 a:hover{color:var(--color-primary-lighter)}
        .guide-card-excerpt{font-size:0.88rem;color:var(--color-text-secondary);line-height:1.6;margin-bottom:var(--spacing-md);flex:1;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
        .guide-card-meta{display:flex;align-items:center;justify-content:space-between;font-size:0.78rem;color:var(--color-text-muted);padding-top:var(--spacing-sm);border-top:1px solid var(--color-border-light)}
        .guide-card-meta span{display:flex;align-items:center;gap:4px}
        .guide-card-meta i{font-size:0.7rem}

        /* Steps Section */
        .steps-section{background:var(--color-surface);padding:var(--spacing-3xl) 0;border-top:1px solid var(--color-border-light);border-bottom:1px solid var(--color-border-light)}
        .steps-section h2{text-align:center;font-size:1.8rem;font-weight:800;color:var(--color-primary);margin-bottom:var(--spacing-sm)}
        .steps-section .section-subtitle{text-align:center;color:var(--color-text-secondary);margin-bottom:var(--spacing-2xl);font-size:1rem}
        .steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--spacing-lg);max-width:var(--max-width);margin:0 auto;padding:0 var(--spacing-lg)}
        .step-card{text-align:center;padding:var(--spacing-xl) var(--spacing-lg);background:var(--color-bg);border-radius:var(--radius-lg);position:relative;transition:all var(--transition-normal);border:2px solid transparent}
        .step-card:hover{border-color:var(--color-primary-lighter);box-shadow:var(--shadow-md);transform:translateY(-2px)}
        .step-number{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;background:var(--color-primary);color:#fff;border-radius:50%;font-weight:800;font-size:1.2rem;margin-bottom:var(--spacing-md)}
        .step-card:nth-child(2) .step-number{background:var(--color-primary-light)}
        .step-card:nth-child(3) .step-number{background:var(--color-primary-lighter)}
        .step-card:nth-child(4) .step-number{background:var(--color-accent)}
        .step-card h4{font-size:1rem;font-weight:700;margin-bottom:var(--spacing-sm);color:var(--color-text)}
        .step-card p{font-size:0.85rem;color:var(--color-text-secondary);line-height:1.6}
        @media(max-width:1024px){.steps-grid{grid-template-columns:repeat(2,1fr)}}
        @media(max-width:520px){.steps-grid{grid-template-columns:1fr}}

        /* FAQ */
        .faq-section{padding:var(--spacing-3xl) 0}
        .faq-section h2{text-align:center;font-size:1.8rem;font-weight:800;color:var(--color-primary);margin-bottom:var(--spacing-2xl)}
        .faq-list{max-width:800px;margin:0 auto}
        .faq-item{background:var(--color-surface);border-radius:var(--radius-md);margin-bottom:var(--spacing-sm);border:1px solid var(--color-border-light);overflow:hidden;transition:all var(--transition-fast)}
        .faq-item:hover{border-color:var(--color-border)}
        .faq-question{width:100%;text-align:left;padding:var(--spacing-lg);background:none;border:none;cursor:pointer;font-size:1rem;font-weight:700;color:var(--color-text);display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-md);transition:color var(--transition-fast)}
        .faq-question:hover{color:var(--color-primary-lighter)}
        .faq-question i{font-size:0.8rem;color:var(--color-accent);transition:transform var(--transition-normal);flex-shrink:0}
        .faq-item.open .faq-question i{transform:rotate(180deg)}
        .faq-answer{max-height:0;overflow:hidden;transition:max-height var(--transition-slow),padding var(--transition-normal)}
        .faq-item.open .faq-answer{max-height:300px;padding:0 var(--spacing-lg) var(--spacing-lg)}
        .faq-answer p{font-size:0.9rem;color:var(--color-text-secondary);line-height:1.7}

        /* CTA Section */
        .cta-section{background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-light) 100%);padding:var(--spacing-3xl) 0;text-align:center;color:#fff;position:relative;overflow:hidden}
        .cta-section::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;opacity:0.12;mix-blend-mode:soft-light}
        .cta-section .container{position:relative;z-index:2}
        .cta-section h2{font-size:2rem;font-weight:800;margin-bottom:var(--spacing-md)}
        .cta-section p{font-size:1.1rem;opacity:0.9;max-width:600px;margin:0 auto var(--spacing-xl)}
        .cta-btn-large{display:inline-flex;align-items:center;gap:10px;background:var(--color-accent);color:#fff;padding:14px 32px;border-radius:var(--radius-xl);font-size:1.05rem;font-weight:700;transition:all var(--transition-normal);border:none;cursor:pointer;box-shadow:0 4px 20px rgba(212,168,83,0.35)}
        .cta-btn-large:hover{background:var(--color-accent-hover);transform:translateY(-2px);box-shadow:0 8px 30px rgba(212,168,83,0.45)}
        .cta-btn-large:active{transform:translateY(0)}
        @media(max-width:768px){.cta-section h2{font-size:1.5rem}.cta-section p{font-size:0.95rem}}

        /* Footer */
        .site-footer{background:var(--color-primary);color:rgba(255,255,255,0.85);padding:var(--spacing-3xl) 0 var(--spacing-xl)}
        .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:var(--spacing-2xl);margin-bottom:var(--spacing-2xl)}
        .footer-brand{font-size:1.2rem;font-weight:800;color:#fff;margin-bottom:var(--spacing-sm)}
        .footer-desc{font-size:0.88rem;line-height:1.7;opacity:0.8;max-width:360px}
        .footer-col h4{color:#fff;font-size:0.95rem;font-weight:700;margin-bottom:var(--spacing-md)}
        .footer-col ul li{margin-bottom:8px}
        .footer-col ul li a{font-size:0.88rem;opacity:0.8;transition:all var(--transition-fast)}
        .footer-col ul li a:hover{opacity:1;color:var(--color-accent);padding-left:4px}
        .footer-bottom{border-top:1px solid rgba(255,255,255,0.15);padding-top:var(--spacing-lg);text-align:center;font-size:0.82rem;opacity:0.7}
        @media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr;gap:var(--spacing-xl)}.footer-col:first-child{grid-column:1/-1}}
        @media(max-width:520px){.footer-grid{grid-template-columns:1fr}}

        /* Utility */
        .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
        .text-accent{color:var(--color-accent)}
        @media(max-width:768px){.hide-mobile{display:none!important}}