/* roulang page: index */
:root {
            --primary: #1A73E8;
            --primary-dark: #1557B0;
            --primary-light: #E8F0FE;
            --accent: #F5A623;
            --accent-light: #FFB74D;
            --bg: #F8F9FA;
            --card-bg: #FFFFFF;
            --text: #1F2937;
            --text-light: #6B7280;
            --border: #E0E0E0;
            --shadow: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-hover: 0 8px 20px rgba(0,0,0,0.10);
            --radius: 8px;
            --radius-lg: 12px;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            scroll-behavior: smooth;
        }
        a { text-decoration: none; color: inherit; transition: color 0.2s; }
        img { max-width: 100%; height: auto; display: block; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

        /* Header / Nav */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 100;
            background: rgba(255,255,255,0.97);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            backdrop-filter: blur(8px);
            transition: box-shadow 0.3s;
        }
        .site-header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }
        .nav-wrap {
            display: flex; align-items: center; justify-content: space-between;
            height: 72px;
        }
        .logo-area {
            display: flex; align-items: center; gap: 0.5rem;
            font-size: 1.5rem; font-weight: 700; color: var(--primary);
        }
        .logo-area i { font-size: 1.8rem; }
        .nav-links { display: flex; align-items: center; gap: 2rem; }
        .nav-links a {
            font-size: 1rem; font-weight: 500; color: var(--text);
            position: relative; padding: 0.25rem 0;
            transition: color 0.2s;
        }
        .nav-links a::after {
            content: ''; position: absolute; bottom: -2px; left: 0;
            width: 0; height: 2px; background: var(--primary);
            transition: width 0.3s;
        }
        .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
        .nav-links a:hover { color: var(--primary); }
        .nav-links a.active { color: var(--primary); }
        .nav-cta {
            display: inline-block;
            background: var(--primary); color: #fff;
            padding: 0.65rem 1.5rem; border-radius: var(--radius);
            font-weight: 600; font-size: 1rem;
            transition: background 0.3s, transform 0.2s;
        }
        .nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); }

        /* Hamburger */
        .hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
        .hamburger span {
            display: block; width: 26px; height: 3px; background: var(--text);
            border-radius: 3px; transition: 0.3s;
        }
        .mobile-menu {
            display: none; position: fixed; top: 72px; left: 0; right: 0;
            background: #fff; padding: 1.5rem 2rem; box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            z-index: 99; flex-direction: column; gap: 1.25rem;
        }
        .mobile-menu.open { display: flex; }
        .mobile-menu a { font-size: 1.1rem; font-weight: 500; color: var(--text); padding: 0.25rem 0; }
        .mobile-menu a:hover { color: var(--primary); }
        .mobile-menu .nav-cta { text-align: center; margin-top: 0.5rem; }

        /* Hero */
        .hero {
            padding: 8rem 0 5rem;
            background: linear-gradient(135deg, #E8F0FE 0%, #F0F4FF 50%, #F8F9FA 100%);
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute; top: -20%; right: -10%;
            width: 400px; height: 400px;
            background: radial-gradient(circle, rgba(26,115,232,0.06) 0%, transparent 70%);
            border-radius: 50%;
        }
        .hero-grid {
            display: grid; grid-template-columns: 1fr 1fr; gap: 3rem;
            align-items: center;
        }
        .hero h1 {
            font-size: 2.8rem; font-weight: 700; line-height: 1.25;
            color: var(--text); margin-bottom: 1rem;
        }
        .hero h1 span { color: var(--primary); }
        .hero .subtitle {
            font-size: 1.2rem; color: var(--text-light);
            margin-bottom: 2rem; max-width: 480px;
        }
        .hero-stats {
            display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
        }
        .stat-card {
            background: #fff; border-radius: var(--radius);
            padding: 1.5rem 1.25rem; box-shadow: var(--shadow);
            text-align: center; transition: transform 0.2s, box-shadow 0.2s;
        }
        .stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
        .stat-number {
            font-size: 2.8rem; font-weight: 700; color: var(--primary);
            line-height: 1.2;
        }
        .stat-unit { font-size: 1rem; font-weight: 400; color: var(--text-light); }
        .stat-label { font-size: 0.9rem; color: var(--text-light); margin-top: 0.3rem; }

        /* Section spacing */
        .section { padding: 5rem 0; }
        .section-title {
            font-size: 2rem; font-weight: 600; text-align: center;
            margin-bottom: 0.75rem; color: var(--text);
        }
        .section-sub {
            text-align: center; color: var(--text-light);
            max-width: 600px; margin: 0 auto 3rem; font-size: 1.05rem;
        }

        /* Service Cards 2x2 */
        .service-grid {
            display: grid; grid-template-columns: 1fr 1fr; gap: 2rem;
        }
        .service-card {
            background: #fff; border-radius: var(--radius-lg);
            overflow: hidden; box-shadow: var(--shadow);
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid rgba(0,0,0,0.04);
        }
        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(26,115,232,0.15);
        }
        .service-card .img-wrap {
            height: 200px; overflow: hidden; background: #E8F0FE;
        }
        .service-card .img-wrap img {
            width: 100%; height: 100%; object-fit: cover;
            transition: transform 0.4s;
        }
        .service-card:hover .img-wrap img { transform: scale(1.04); }
        .service-card .card-body { padding: 1.5rem; }
        .service-card h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text); }
        .service-card p { font-size: 0.95rem; color: var(--text-light); margin-bottom: 1rem; line-height: 1.6; }
        .service-card .card-link {
            font-weight: 600; color: var(--primary);
            display: inline-flex; align-items: center; gap: 0.3rem;
            transition: gap 0.2s;
        }
        .service-card .card-link:hover { gap: 0.6rem; }

        /* Comparison */
        .comparison-grid {
            display: grid; grid-template-columns: 1fr 1fr; gap: 2rem;
        }
        .compare-box {
            background: #fff; border: 1px solid var(--border);
            border-radius: var(--radius-lg); padding: 2rem;
            position: relative;
        }
        .compare-box.traditional { background: #F5F5F5; }
        .compare-box.modern {
            background: var(--primary-light);
            border-color: rgba(26,115,232,0.2);
        }
        .compare-box .badge {
            display: inline-block; padding: 0.2rem 0.8rem;
            border-radius: 20px; font-size: 0.8rem; font-weight: 600;
            margin-bottom: 1rem;
        }
        .compare-box.traditional .badge { background: #E0E0E0; color: #555; }
        .compare-box.modern .badge { background: var(--accent); color: #fff; }
        .compare-box h4 { font-size: 1.2rem; font-weight: 600; margin-bottom: 1.2rem; }
        .compare-list { list-style: none; padding: 0; }
        .compare-list li {
            display: flex; align-items: flex-start; gap: 0.6rem;
            padding: 0.5rem 0; font-size: 0.95rem;
            border-bottom: 1px solid rgba(0,0,0,0.04);
        }
        .compare-list li:last-child { border-bottom: none; }
        .compare-list li i { margin-top: 0.2rem; font-size: 1rem; }
        .compare-list li .fa-check-circle { color: #34A853; }
        .compare-list li .fa-times-circle { color: #EA4335; }
        .compare-cta { margin-top: 1.5rem; }

        /* News List */
        .news-list { max-width: 800px; margin: 0 auto; }
        .news-item {
            display: flex; align-items: flex-start; gap: 1.2rem;
            padding: 1.25rem 0; border-bottom: 1px solid #eee;
        }
        .news-item:last-child { border-bottom: none; }
        .news-badge {
            display: inline-block; padding: 0.2rem 0.7rem;
            border-radius: 4px; font-size: 0.75rem; font-weight: 600;
            background: var(--primary-light); color: var(--primary);
            white-space: nowrap; flex-shrink: 0;
        }
        .news-content { flex: 1; }
        .news-title {
            font-size: 1.05rem; font-weight: 600; margin-bottom: 0.3rem;
            color: var(--text); transition: color 0.2s;
        }
        .news-title:hover { color: var(--primary); }
        .news-summary {
            font-size: 0.9rem; color: var(--text-light);
            display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
            overflow: hidden; margin-bottom: 0.3rem;
        }
        .news-meta {
            font-size: 0.8rem; color: #9CA3AF;
            display: flex; align-items: center; gap: 1rem;
        }
        .news-meta a { color: var(--primary); font-weight: 500; }
        .news-empty {
            text-align: center; padding: 3rem 1rem; color: var(--text-light);
            font-size: 1rem;
        }

        /* FAQ */
        .faq-wrap { max-width: 720px; margin: 0 auto; }
        .faq-item {
            background: #fff; border: 1px solid var(--border);
            border-radius: var(--radius); margin-bottom: 0.75rem;
            overflow: hidden; transition: box-shadow 0.2s;
        }
        .faq-item:hover { box-shadow: var(--shadow); }
        .faq-question {
            display: flex; justify-content: space-between; align-items: center;
            padding: 1.2rem 1.5rem; cursor: pointer;
            font-size: 1.05rem; font-weight: 500;
            background: #F1F3F4; transition: background 0.2s;
        }
        .faq-question:hover { background: #E8ECF0; }
        .faq-question i { transition: transform 0.3s; color: var(--primary); }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0; overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 1.5rem; background: #fff; color: var(--text-light);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px; padding: 1.2rem 1.5rem 1.5rem;
        }

        /* Form */
        .form-section {
            background: linear-gradient(135deg, #F8F9FA 0%, #E8F0FE 100%);
        }
        .form-box {
            max-width: 560px; margin: 0 auto;
            background: #fff; border-radius: var(--radius-lg);
            padding: 3rem; box-shadow: var(--shadow);
            border: 1px solid rgba(0,0,0,0.04);
        }
        .form-box h2 { text-align: center; font-size: 1.8rem; font-weight: 600; margin-bottom: 0.5rem; }
        .form-box .form-desc { text-align: center; color: var(--text-light); margin-bottom: 2rem; font-size: 0.95rem; }
        .form-box label { font-size: 0.9rem; font-weight: 500; margin-bottom: 0.3rem; display: block; color: var(--text); }
        .form-box input, .form-box textarea {
            width: 100%; padding: 0.85rem 1rem;
            border: 1px solid #CCC; border-radius: var(--radius);
            font-size: 1rem; font-family: inherit;
            transition: border-color 0.2s, box-shadow 0.2s;
            margin-bottom: 1.2rem; background: #fff;
        }
        .form-box input:focus, .form-box textarea:focus {
            outline: none; border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26,115,232,0.15);
        }
        .form-box textarea { min-height: 100px; resize: vertical; }
        .form-box .btn-submit {
            width: 100%; padding: 1rem;
            background: var(--primary); color: #fff;
            border: none; border-radius: var(--radius);
            font-size: 1.1rem; font-weight: 600;
            cursor: pointer; transition: background 0.3s, transform 0.2s;
        }
        .form-box .btn-submit:hover { background: var(--primary-dark); transform: translateY(-1px); }

        /* Footer */
        .site-footer {
            background: #222; color: rgba(255,255,255,0.85);
            padding: 3.5rem 0 2rem;
        }
        .footer-grid {
            display: grid; grid-template-columns: 2fr 1fr; gap: 3rem;
            padding-bottom: 2rem; border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo-area { color: #fff; margin-bottom: 0.75rem; }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 360px; color: rgba(255,255,255,0.65); }
        .footer-links h4 { font-size: 1rem; font-weight: 600; margin-bottom: 1rem; color: #fff; }
        .footer-links ul { list-style: none; padding: 0; }
        .footer-links li { margin-bottom: 0.5rem; }
        .footer-links a { font-size: 0.9rem; color: rgba(255,255,255,0.65); transition: color 0.2s; }
        .footer-links a:hover { color: var(--accent); }
        .footer-bottom {
            display: flex; justify-content: space-between; align-items: center;
            padding-top: 1.5rem; font-size: 0.85rem;
            color: rgba(255,255,255,0.45);
        }
        .footer-bottom a { color: rgba(255,255,255,0.55); }
        .footer-bottom a:hover { color: var(--accent); }

        /* Buttons */
        .btn-primary {
            display: inline-block; padding: 0.75rem 2rem;
            background: var(--primary); color: #fff;
            border-radius: var(--radius); font-weight: 600;
            transition: background 0.3s, transform 0.2s;
            border: none; cursor: pointer;
        }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
        .btn-outline {
            display: inline-block; padding: 0.7rem 1.8rem;
            background: transparent; color: var(--primary);
            border: 2px solid var(--primary); border-radius: var(--radius);
            font-weight: 600; transition: background 0.3s, color 0.3s;
        }
        .btn-outline:hover { background: var(--primary); color: #fff; }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero h1 { font-size: 2.2rem; }
            .stat-number { font-size: 2.2rem; }
        }
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .hamburger { display: flex; }
            .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
            .hero { padding: 6rem 0 3rem; }
            .hero h1 { font-size: 1.8rem; }
            .hero .subtitle { font-size: 1rem; }
            .hero-stats { grid-template-columns: 1fr 1fr; gap: 1rem; }
            .stat-number { font-size: 2rem; }
            .section { padding: 3rem 0; }
            .section-title { font-size: 1.5rem; }
            .service-grid { grid-template-columns: 1fr; }
            .comparison-grid { grid-template-columns: 1fr; }
            .form-box { padding: 2rem 1.5rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
            .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
            .faq-question { font-size: 0.95rem; padding: 1rem 1.2rem; }
        }
        @media (max-width: 520px) {
            .hero-stats { grid-template-columns: 1fr 1fr; gap: 0.75rem; }
            .stat-card { padding: 1rem 0.75rem; }
            .stat-number { font-size: 1.6rem; }
            .hero h1 { font-size: 1.5rem; }
            .container { padding: 0 1rem; }
        }

        /* Utilities */
        .mt-2 { margin-top: 2rem; }
        .text-center { text-align: center; }
        .gap-2 { gap: 0.5rem; }
        .flex-center { display: flex; align-items: center; justify-content: center; }

/* roulang page: article */
:root {
            --primary: #1A73E8;
            --primary-dark: #1557B0;
            --primary-light: #E8F0FE;
            --accent: #F5A623;
            --accent-light: #FFB74D;
            --bg: #F8F9FA;
            --card-bg: #FFFFFF;
            --text: #1F2937;
            --text-secondary: #6B7280;
            --text-light: #9CA3AF;
            --border: #E0E0E0;
            --radius: 8px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 8px 20px rgba(0,0,0,0.1);
            --transition: 0.3s ease;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .container-narrow {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        /* ===== Header & Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: var(--card-bg);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
            height: 72px;
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
        }
        .logo-area i {
            font-size: 1.8rem;
            color: var(--accent);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
            list-style: none;
        }
        .nav-links a {
            font-size: 1rem;
            font-weight: 500;
            color: var(--text);
            position: relative;
            padding: 0.25rem 0;
            transition: color var(--transition);
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-links a:hover {
            color: var(--primary);
        }
        .nav-links a.active {
            color: var(--primary);
        }
        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 0.6rem 1.5rem !important;
            border-radius: var(--radius);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            transition: background var(--transition), transform var(--transition);
            box-shadow: 0 2px 8px rgba(26,115,232,0.25);
        }
        .nav-cta:hover {
            background: var(--primary-dark) !important;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(26,115,232,0.35);
        }
        .nav-cta::after {
            display: none !important;
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text);
            cursor: pointer;
            padding: 0.25rem;
        }
        /* ===== Article Banner ===== */
        .article-banner {
            padding: 8rem 0 3rem 0;
            background: linear-gradient(135deg, var(--primary-light) 0%, #F0F7FF 100%);
            position: relative;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .article-banner .breadcrumb {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 1.2rem;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem;
        }
        .article-banner .breadcrumb a {
            color: var(--primary);
            font-weight: 500;
        }
        .article-banner .breadcrumb a:hover {
            text-decoration: underline;
        }
        .article-banner .breadcrumb .sep {
            color: var(--text-light);
        }
        .article-banner h1 {
            font-size: 2.4rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text);
            max-width: 900px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin-top: 1rem;
            font-size: 0.9rem;
            color: var(--text-secondary);
            align-items: center;
        }
        .article-meta .badge {
            background: var(--accent);
            color: #fff;
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }
        .article-meta i {
            margin-right: 0.3rem;
            color: var(--primary);
        }
        /* ===== Article Content ===== */
        .article-main {
            padding: 3rem 0 4rem 0;
        }
        .article-body {
            background: var(--card-bg);
            border-radius: 12px;
            box-shadow: var(--shadow-sm);
            padding: 2.5rem 3rem;
            line-height: 1.9;
            font-size: 1.05rem;
            color: var(--text);
        }
        .article-body h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-top: 2rem;
            margin-bottom: 1rem;
            color: var(--text);
            border-left: 4px solid var(--primary);
            padding-left: 1rem;
        }
        .article-body h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin-top: 1.6rem;
            margin-bottom: 0.8rem;
            color: var(--text);
        }
        .article-body p {
            margin-bottom: 1.2rem;
        }
        .article-body ul,
        .article-body ol {
            margin: 1rem 0 1.5rem 2rem;
        }
        .article-body li {
            margin-bottom: 0.4rem;
        }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body a {
            color: var(--primary);
            text-decoration: underline;
        }
        .article-body a:hover {
            color: var(--primary-dark);
        }
        .article-body img {
            border-radius: var(--radius);
            margin: 1.5rem auto;
            box-shadow: var(--shadow-sm);
        }
        .article-body .wp-block-table,
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
        }
        .article-body table th,
        .article-body table td {
            border: 1px solid var(--border);
            padding: 0.75rem 1rem;
            text-align: left;
        }
        .article-body table th {
            background: var(--primary-light);
            font-weight: 600;
        }
        .article-body .wp-block-code,
        .article-body code {
            background: #F3F4F6;
            padding: 0.2rem 0.6rem;
            border-radius: 4px;
            font-size: 0.9em;
            font-family: 'Menlo', 'Consolas', monospace;
        }
        .article-body .wp-block-preformatted,
        .article-body pre {
            background: #1F2937;
            color: #E5E7EB;
            padding: 1.5rem;
            border-radius: var(--radius);
            overflow-x: auto;
            font-size: 0.9rem;
            line-height: 1.6;
            margin: 1.5rem 0;
        }
        .article-body .wp-block-preformatted code,
        .article-body pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }
        .article-not-found {
            text-align: center;
            padding: 5rem 2rem;
            background: var(--card-bg);
            border-radius: 12px;
            box-shadow: var(--shadow-sm);
        }
        .article-not-found i {
            font-size: 3rem;
            color: var(--text-light);
            margin-bottom: 1rem;
        }
        .article-not-found h2 {
            font-size: 1.8rem;
            color: var(--text);
            margin-bottom: 0.6rem;
        }
        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
        }
        .article-not-found .btn-primary {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 0.7rem 2rem;
            border-radius: var(--radius);
            font-weight: 600;
            transition: background var(--transition);
        }
        .article-not-found .btn-primary:hover {
            background: var(--primary-dark);
        }
        /* ===== Related ===== */
        .related-section {
            padding: 3rem 0 4rem 0;
            background: var(--card-bg);
        }
        .related-section h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 2rem;
            text-align: center;
            color: var(--text);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.8rem;
        }
        .related-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--primary-light);
        }
        .related-card .card-body {
            padding: 1.2rem 1.5rem 1.5rem;
        }
        .related-card .card-body h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 0.4rem;
            color: var(--text);
        }
        .related-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0.8rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .read-link {
            color: var(--primary);
            font-weight: 500;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            transition: color var(--transition);
        }
        .related-card .card-body .read-link:hover {
            color: var(--primary-dark);
        }
        .related-card .card-body .read-link i {
            font-size: 0.75rem;
            transition: transform var(--transition);
        }
        .related-card .card-body .read-link:hover i {
            transform: translateX(3px);
        }
        /* ===== Back to Home ===== */
        .back-home-wrap {
            text-align: center;
            padding: 2.5rem 0 4rem 0;
        }
        .back-home-wrap .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
            padding: 0.7rem 2rem;
            border-radius: var(--radius);
            font-weight: 600;
            transition: background var(--transition), color var(--transition);
        }
        .back-home-wrap .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }
        /* ===== Footer ===== */
        .site-footer {
            background: #1F2937;
            color: #E5E7EB;
            padding: 3.5rem 0 2rem 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 3rem;
            margin-bottom: 2.5rem;
        }
        .footer-brand .logo-area {
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-brand .logo-area i {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: #D1D5DB;
            max-width: 480px;
        }
        .footer-links h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: #fff;
        }
        .footer-links ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .footer-links ul a {
            color: #D1D5DB;
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer-links ul a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid #374151;
            padding-top: 1.5rem;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
            font-size: 0.85rem;
            color: #9CA3AF;
        }
        .footer-bottom a {
            color: #D1D5DB;
            transition: color var(--transition);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .site-header {
                height: 64px;
            }
            .mobile-toggle {
                display: block;
            }
            .nav-links {
                position: fixed;
                top: 64px;
                left: 0;
                width: 100%;
                background: var(--card-bg);
                flex-direction: column;
                padding: 1.5rem 2rem 2rem;
                gap: 1.2rem;
                box-shadow: 0 8px 20px rgba(0,0,0,0.1);
                transform: translateY(-120%);
                opacity: 0;
                transition: transform 0.4s ease, opacity 0.4s ease;
                border-bottom: 2px solid var(--primary-light);
                z-index: 999;
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
            }
            .nav-links a {
                font-size: 1.1rem;
                width: 100%;
                padding: 0.5rem 0;
            }
            .nav-cta {
                justify-content: center;
                width: 100%;
                margin-top: 0.5rem;
            }
            .article-banner {
                padding: 6rem 0 2rem 0;
                min-height: 200px;
            }
            .article-banner h1 {
                font-size: 1.6rem;
            }
            .article-body {
                padding: 1.5rem 1.2rem;
                font-size: 1rem;
            }
            .article-body h2 {
                font-size: 1.3rem;
            }
            .article-body h3 {
                font-size: 1.15rem;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
            .related-card .card-img {
                height: 160px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .article-meta {
                gap: 0.8rem;
                font-size: 0.85rem;
            }
            .container-narrow {
                padding: 0 1rem;
            }
        }
        @media (max-width: 520px) {
            .article-banner h1 {
                font-size: 1.35rem;
            }
            .article-body {
                padding: 1.2rem 1rem;
                font-size: 0.95rem;
            }
            .article-body h2 {
                font-size: 1.15rem;
                padding-left: 0.8rem;
            }
            .article-body h3 {
                font-size: 1.05rem;
            }
            .related-card .card-img {
                height: 140px;
            }
            .back-home-wrap .btn-outline {
                padding: 0.6rem 1.5rem;
                font-size: 0.9rem;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #1A73E8;
            --primary-dark: #1557B0;
            --primary-light: #E8F0FE;
            --accent: #F5A623;
            --accent-light: #FFB74D;
            --bg: #F8F9FA;
            --card-bg: #FFFFFF;
            --text: #1F2937;
            --text-light: #6B7280;
            --border: #E0E0E0;
            --radius: 8px;
            --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 8px 20px rgba(0, 0, 0, 0.1);
            --transition: 0.3s ease;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            margin: 0;
            padding: 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        /* Header / Nav */
        .site-header {
            background: #fff;
            border-bottom: 1px solid var(--border);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.75rem 0;
            flex-wrap: nowrap;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
            white-space: nowrap;
        }
        .logo-area i {
            font-size: 1.6rem;
            color: var(--accent);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: nowrap;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--text);
            font-size: 1rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            transition: var(--transition);
            white-space: nowrap;
            position: relative;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-links a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 1rem;
            right: 1rem;
            height: 2px;
            background: var(--primary);
            border-radius: 1px;
        }
        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 0.6rem 1.5rem !important;
            border-radius: var(--radius) !important;
            font-weight: 600;
            transition: var(--transition);
            margin-left: 0.5rem;
        }
        .nav-cta:hover {
            background: var(--primary-dark) !important;
            color: #fff !important;
            box-shadow: 0 4px 12px rgba(26, 115, 232, 0.35) !important;
        }
        .nav-cta.active::after {
            display: none !important;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text);
            cursor: pointer;
            padding: 0.25rem 0.5rem;
        }
        /* Page Banner */
        .page-banner {
            padding: 10rem 0 5rem;
            background: linear-gradient(135deg, #E8F0FE 0%, #D0E2FF 100%);
            position: relative;
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }
        .page-banner .bg-img {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
        }
        .page-banner .container {
            position: relative;
            z-index: 1;
        }
        .breadcrumb {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 1.5rem;
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: var(--text-light);
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 0.75rem;
            line-height: 1.2;
        }
        .page-banner h1 .highlight {
            color: var(--primary);
        }
        .page-banner .subtitle {
            font-size: 1.2rem;
            color: var(--text-light);
            max-width: 640px;
            line-height: 1.8;
        }
        /* Section spacing */
        section {
            padding: 5rem 0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--text);
            text-align: center;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-light);
            text-align: center;
            max-width: 700px;
            margin: 0 auto 3rem;
            line-height: 1.8;
        }
        /* Feature Cards */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 2rem;
        }
        .feature-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 2.5rem 2rem;
            transition: var(--transition);
            border: 1px solid var(--border);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary);
        }
        .feature-card .icon {
            font-size: 2.4rem;
            color: var(--primary);
            margin-bottom: 1.25rem;
        }
        .feature-card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.7;
        }
        /* Product / Service Grid */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 2rem;
        }
        .product-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .product-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary);
        }
        .product-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            background: #E5E7EB;
        }
        .product-card .card-body {
            padding: 1.5rem;
        }
        .product-card .card-body h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        .product-card .card-body p {
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 1rem;
        }
        .product-card .card-body .tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.8rem;
            padding: 0.2rem 0.75rem;
            border-radius: 20px;
            font-weight: 500;
        }
        .card-link {
            color: var(--primary);
            font-weight: 500;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            transition: var(--transition);
        }
        .card-link:hover {
            color: var(--primary-dark);
            gap: 0.7rem;
        }
        /* Scenario Section */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .scenario-item {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            border-left: 4px solid var(--primary);
            transition: var(--transition);
        }
        .scenario-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateX(4px);
        }
        .scenario-item .icon {
            font-size: 1.8rem;
            color: var(--accent);
            margin-bottom: 0.75rem;
        }
        .scenario-item h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        .scenario-item p {
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.7;
            margin: 0;
        }
        /* Process Timeline */
        .process-steps {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            justify-content: center;
            counter-reset: step;
        }
        .process-step {
            flex: 1 1 180px;
            max-width: 220px;
            text-align: center;
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 2rem 1.5rem;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            position: relative;
            transition: var(--transition);
        }
        .process-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .process-step .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.3rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
        }
        .process-step h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 0.4rem;
        }
        .process-step p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.6;
            margin: 0;
        }
        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card-bg);
            border-radius: var(--radius);
            margin-bottom: 0.75rem;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            overflow: hidden;
        }
        .faq-question {
            padding: 1.25rem 1.5rem;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #F1F3F4;
            transition: var(--transition);
            user-select: none;
        }
        .faq-question:hover {
            background: #E8EAED;
        }
        .faq-question .arrow {
            transition: transform 0.3s ease;
            color: var(--text-light);
            font-size: 1.1rem;
        }
        .faq-question.open .arrow {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 1.5rem;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            background: #fff;
        }
        .faq-answer.open {
            max-height: 400px;
            padding: 1.25rem 1.5rem;
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.8;
            margin: 0;
        }
        /* CTA Form */
        .cta-section {
            background: var(--bg);
        }
        .cta-form-wrap {
            max-width: 600px;
            margin: 0 auto;
            background: var(--card-bg);
            border-radius: 12px;
            padding: 3rem;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .cta-form-wrap h2 {
            text-align: center;
            font-size: 1.8rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        .cta-form-wrap .form-desc {
            text-align: center;
            color: var(--text-light);
            margin-bottom: 2rem;
            font-size: 1rem;
        }
        .form-group {
            margin-bottom: 1.25rem;
        }
        .form-group label {
            display: block;
            font-weight: 500;
            margin-bottom: 0.35rem;
            font-size: 0.95rem;
        }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid #CCC;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
            font-family: inherit;
            background: #fff;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .btn-submit {
            width: 100%;
            padding: 0.9rem;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn-submit:hover {
            background: var(--primary-dark);
            box-shadow: 0 4px 16px rgba(26, 115, 232, 0.35);
        }
        /* Footer */
        .site-footer {
            background: #222;
            color: #ccc;
            padding: 3rem 0 1.5rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 3rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo-area {
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-brand .logo-area i {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 0.95rem;
            line-height: 1.8;
            color: #aaa;
            max-width: 480px;
        }
        .footer-links h4 {
            color: #fff;
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        .footer-links ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links ul li {
            margin-bottom: 0.5rem;
        }
        .footer-links ul li a {
            color: #aaa;
            text-decoration: none;
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .footer-links ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 1.5rem;
            font-size: 0.85rem;
            color: #888;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .footer-bottom a {
            color: #aaa;
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .page-banner h1 {
                font-size: 2.2rem;
            }
            .feature-grid,
            .product-grid {
                gap: 1.5rem;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #fff;
                padding: 1rem 0;
                border-top: 1px solid var(--border);
                gap: 0.25rem;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                padding: 0.6rem 1rem;
                width: 100%;
                text-align: left;
            }
            .nav-links a.active::after {
                display: none;
            }
            .nav-links a.active {
                background: var(--primary-light);
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 0.5rem;
                text-align: center !important;
            }
            .header-inner {
                flex-wrap: wrap;
            }
            .page-banner {
                padding: 7rem 0 3.5rem;
                min-height: auto;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner .subtitle {
                font-size: 1rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .product-grid {
                grid-template-columns: 1fr;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .process-steps {
                flex-direction: column;
                align-items: center;
            }
            .process-step {
                max-width: 100%;
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-form-wrap {
                padding: 2rem 1.5rem;
            }
            section {
                padding: 3rem 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .product-card .card-img {
                height: 160px;
            }
            .feature-card {
                padding: 1.75rem 1.25rem;
            }
            .scenario-item {
                padding: 1.5rem;
            }
        }
        /* Smooth scroll */
        html {
            scroll-behavior: smooth;
        }
        /* Focus visible */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }