/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1243af;
            --primary-light: #e8effd;
            --secondary: #0ea5e9;
            --accent: #f59e0b;
            --success: #10b981;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-section-alt: #f1f5f9;
            --text-dark: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --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(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-hover: 0 16px 48px rgba(0,0,0,0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-max: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }
        button, input, select, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-dark); line-height: 1.3; font-weight: 600; }
        h1 { font-size: 2.75rem; letter-spacing: -0.02em; }
        h2 { font-size: 2.125rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.25rem; }
        p { margin-bottom: 1rem; }
        .container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; width: 100%; }

        /* ===== Foundation Overrides ===== */
        .grid-container { max-width: var(--container-max); padding-left: 24px; padding-right: 24px; }
        .cell { margin-bottom: 0; }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-dark);
            letter-spacing: -0.02em;
            white-space: nowrap;
        }
        .logo i {
            color: var(--primary);
            font-size: 1.6rem;
        }
        .logo:hover { color: var(--text-dark); }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 32px;
            margin: 0;
        }
        .main-nav a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
            padding: 4px 0;
            position: relative;
            transition: color var(--transition);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
            border-radius: 2px;
        }
        .main-nav a:hover { color: var(--primary); }
        .main-nav a:hover::after { width: 100%; }
        .main-nav a.active { color: var(--primary); }
        .main-nav a.active::after { width: 100%; }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg-section-alt);
            border-radius: 100px;
            padding: 0 12px 0 16px;
            border: 1px solid var(--border-color);
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
        }
        .search-box input {
            border: none;
            background: transparent;
            padding: 8px 0;
            font-size: 0.9rem;
            color: var(--text-dark);
            outline: none;
            width: 160px;
        }
        .search-box input::placeholder { color: var(--text-light); }
        .search-box button {
            border: none;
            background: transparent;
            color: var(--text-muted);
            cursor: pointer;
            padding: 6px 4px;
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .search-box button:hover { color: var(--primary); }
        .btn-cta-nav {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary);
            color: #fff;
            padding: 10px 24px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.9rem;
            border: none;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            white-space: nowrap;
        }
        .btn-cta-nav:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .btn-cta-nav:active { transform: translateY(0); }

        /* Mobile menu toggle */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-dark);
            cursor: pointer;
            padding: 4px;
        }
        .menu-toggle:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

        /* ===== Hero Section ===== */
        .hero {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1a56db 100%);
            color: #fff;
            padding: 100px 0 80px;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(14, 165, 233, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero .container { position: relative; z-index: 1; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.10);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255,255,255,0.15);
            padding: 6px 18px;
            border-radius: 100px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.85);
            margin-bottom: 24px;
        }
        .hero-badge i { color: var(--accent); }
        .hero h1 {
            font-size: 3.25rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.15;
            margin-bottom: 20px;
            max-width: 780px;
        }
        .hero h1 span {
            background: linear-gradient(135deg, #60a5fa, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.75);
            max-width: 600px;
            margin-bottom: 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            color: var(--primary);
            padding: 14px 36px;
            border-radius: 100px;
            font-weight: 700;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .btn-hero-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(0,0,0,0.20);
            color: var(--primary-dark);
        }
        .btn-hero-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #fff;
            padding: 14px 36px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 1rem;
            border: 1px solid rgba(255,255,255,0.30);
            cursor: pointer;
            transition: background var(--transition), border-color var(--transition);
        }
        .btn-hero-secondary:hover {
            background: rgba(255,255,255,0.10);
            border-color: rgba(255,255,255,0.50);
            color: #fff;
        }
        .hero-stats {
            display: flex;
            gap: 48px;
            margin-top: 56px;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.10);
        }
        .hero-stat-item { text-align: left; }
        .hero-stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .hero-stat-label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.55);
            margin-top: 4px;
        }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-title-wrap {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-title-wrap h2 {
            margin-bottom: 12px;
        }
        .section-title-wrap p {
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }

        /* ===== Feature / Core Cards ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 20px;
        }
        .feature-card h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }
        .feature-card p {
            color: var(--text-muted);
            font-size: 0.92rem;
            margin-bottom: 0;
        }

        /* ===== Category Entry ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .category-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 36px 32px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            display: flex;
            align-items: flex-start;
            gap: 20px;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .category-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        .category-icon {
            width: 60px;
            height: 60px;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.7rem;
            color: var(--primary);
            flex-shrink: 0;
        }
        .category-card h3 {
            font-size: 1.15rem;
            margin-bottom: 6px;
        }
        .category-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 12px;
        }
        .category-link {
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary);
        }
        .category-link i { transition: transform var(--transition); }
        .category-link:hover i { transform: translateX(4px); }

        /* ===== News / CMS List ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: transform var(--transition), box-shadow var(--transition);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        .news-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .news-cat {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.75rem;
        }
        .news-card h3 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .news-card h3 a {
            color: var(--text-dark);
            transition: color var(--transition);
        }
        .news-card h3 a:hover { color: var(--primary); }
        .news-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 12px;
            flex: 1;
        }
        .news-date {
            font-size: 0.8rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }

        /* ===== Stats / Data Block ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: transform var(--transition);
        }
        .stat-card:hover { transform: translateY(-3px); }
        .stat-number {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-number span { font-size: 1.5rem; }
        .stat-label {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-top: 6px;
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .process-step {
            text-align: center;
            position: relative;
        }
        .process-step-num {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: 700;
            margin: 0 auto 18px;
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.25);
        }
        .process-step h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
        }
        .process-step p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .process-connector {
            display: none;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            margin-bottom: 14px;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 20px 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            cursor: pointer;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--bg-section-alt); }
        .faq-question:focus-visible { outline: 2px solid var(--primary); outline-offset: -2px; }
        .faq-question i {
            color: var(--text-muted);
            transition: transform var(--transition);
            font-size: 0.9rem;
        }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 28px 20px;
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #1a56db 0%, #0f172a 100%);
            color: #fff;
            padding: 80px 0;
            text-align: center;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2.25rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.70);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .btn-cta-large {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: #fff;
            color: var(--primary);
            padding: 16px 44px;
            border-radius: 100px;
            font-weight: 700;
            font-size: 1.05rem;
            border: none;
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .btn-cta-large:hover {
            transform: translateY(-2px);
            box-shadow: 0 16px 40px rgba(0,0,0,0.25);
            color: var(--primary-dark);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: rgba(255,255,255,0.65);
            padding: 60px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .logo i { color: #60a5fa; }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.50);
            max-width: 320px;
            margin-bottom: 20px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.50);
            font-size: 1rem;
            transition: background var(--transition), color var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a {
            color: rgba(255,255,255,0.50);
            font-size: 0.88rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover { color: #60a5fa; }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 24px;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.35);
        }
        .footer-bottom a { color: rgba(255,255,255,0.35); }
        .footer-bottom a:hover { color: rgba(255,255,255,0.60); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .process-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 24px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .hero h1 { font-size: 2.75rem; }
        }

        @media (max-width: 768px) {
            .site-header { height: auto; padding: 12px 0; }
            .main-nav {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 20px 24px;
                gap: 16px;
                box-shadow: var(--shadow-md);
                border-bottom: 1px solid var(--border-color);
            }
            .main-nav.open { display: flex; }
            .main-nav a { font-size: 1rem; padding: 8px 0; }
            .main-nav a::after { display: none; }
            .menu-toggle { display: block; }
            .search-box input { width: 120px; }
            .btn-cta-nav { padding: 8px 18px; font-size: 0.85rem; }

            .hero { padding: 60px 0 50px; }
            .hero h1 { font-size: 2.2rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { flex-wrap: wrap; gap: 24px; }
            .hero-stat-item { flex: 1; min-width: 100px; }

            .features-grid { grid-template-columns: 1fr; }
            .category-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .process-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }

            .section { padding: 56px 0; }
            .section-title-wrap { margin-bottom: 36px; }
            .section-title-wrap h2 { font-size: 1.6rem; }

            .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
            .cta-section h2 { font-size: 1.6rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero h1 { font-size: 1.8rem; }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .btn-hero-primary, .btn-hero-secondary { justify-content: center; text-align: center; }
            .hero-stats { gap: 16px; }
            .hero-stat-number { font-size: 1.5rem; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-card { padding: 20px 12px; }
            .stat-number { font-size: 1.6rem; }
            .feature-card { padding: 24px 20px; }
            .category-card { flex-direction: column; padding: 24px 20px; }
            .faq-question { padding: 16px 18px; font-size: 0.92rem; }
            .faq-answer { padding: 0 18px 16px; }
            .btn-cta-large { width: 100%; justify-content: center; }
            .search-box input { width: 80px; }
            .nav-actions .btn-cta-nav { display: none; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-1 { margin-top: 0.5rem; }
        .mt-2 { margin-top: 1rem; }
        .mb-2 { margin-bottom: 1rem; }
        .gap-1 { gap: 0.5rem; }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1342a8;
            --primary-light: #e8effd;
            --secondary: #0f973d;
            --secondary-light: #e6f7ec;
            --accent: #f59e0b;
            --bg-body: #ffffff;
            --bg-section: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --nav-height: 68px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

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

        ul,
        ol {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 0.5em;
        }

        p {
            margin-bottom: 1em;
            color: var(--text-secondary);
        }

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

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
            height: var(--nav-height);
            display: flex;
            align-items: center;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.3px;
        }
        .logo i {
            font-size: 1.5rem;
            color: var(--primary);
        }
        .logo:hover {
            color: var(--primary);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: background var(--transition), color var(--transition);
            position: relative;
        }
        .main-nav a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .main-nav a.active {
            background: var(--primary);
            color: var(--text-white);
        }
        .main-nav a.active:hover {
            background: var(--primary-dark);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .header-search {
            display: flex;
            align-items: center;
            background: var(--bg-section);
            border: 1px solid var(--border-color);
            border-radius: 30px;
            padding: 0 16px;
            height: 40px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .header-search:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
        }
        .header-search input {
            border: none;
            background: transparent;
            outline: none;
            padding: 0 8px;
            width: 160px;
            font-size: 0.9rem;
            color: var(--text-primary);
        }
        .header-search input::placeholder {
            color: var(--text-muted);
        }
        .header-search button {
            border: none;
            background: transparent;
            color: var(--text-muted);
            cursor: pointer;
            padding: 4px;
            font-size: 0.95rem;
            transition: color var(--transition);
        }
        .header-search button:hover {
            color: var(--primary);
        }

        .btn-cta-nav {
            background: var(--primary);
            color: var(--text-white);
            border: none;
            border-radius: 30px;
            padding: 10px 24px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .btn-cta-nav:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .btn-cta-nav:active {
            transform: scale(0.97);
        }

        /* Mobile Menu Toggle */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
        }
        .menu-toggle:focus-visible {
            outline: 3px solid var(--primary);
        }

        /* ===== Page Hero ===== */
        .page-hero {
            background: linear-gradient(135deg, #f0f5ff 0%, #e8effd 50%, #dce6f7 100%);
            padding: 80px 0 60px;
            border-bottom: 1px solid var(--border-color);
        }
        .page-hero .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            flex-wrap: wrap;
        }
        .page-hero-content {
            flex: 1 1 50%;
            min-width: 320px;
        }
        .page-hero-content .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 16px;
        }
        .page-hero-content .breadcrumb a {
            color: var(--text-muted);
        }
        .page-hero-content .breadcrumb a:hover {
            color: var(--primary);
        }
        .page-hero-content .breadcrumb i {
            font-size: 0.7rem;
        }
        .page-hero-content h1 {
            font-size: 2.6rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .page-hero-content h1 span {
            color: var(--primary);
        }
        .page-hero-content p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 540px;
            margin-bottom: 24px;
        }
        .page-hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: var(--text-white);
            border: none;
            border-radius: 30px;
            padding: 14px 32px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: var(--text-white);
        }
        .btn-primary:active {
            transform: scale(0.97);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
            border-radius: 30px;
            padding: 12px 30px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: scale(0.97);
        }

        .page-hero-visual {
            flex: 1 1 40%;
            min-width: 280px;
            display: flex;
            justify-content: center;
        }
        .page-hero-visual .hero-illustration {
            width: 100%;
            max-width: 480px;
            background: rgba(255, 255, 255, 0.6);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-lg);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.8);
        }
        .hero-illustration .icon-row {
            display: flex;
            justify-content: center;
            gap: 24px;
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .hero-illustration .icon-row i {
            font-size: 2.8rem;
            color: var(--primary);
            background: var(--primary-light);
            width: 70px;
            height: 70px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 16px;
        }
        .hero-illustration .stat-line {
            display: flex;
            justify-content: space-around;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-illustration .stat-item {
            text-align: center;
        }
        .hero-illustration .stat-item .num {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
        }
        .hero-illustration .stat-item .label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ===== Section Common ===== */
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background: var(--bg-section);
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-title .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        /* ===== Platform Overview Cards ===== */
        .overview-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 28px;
        }
        .overview-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            transition: transform var(--transition), box-shadow var(--transition);
            text-align: center;
        }
        .overview-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .overview-card .icon-box {
            width: 60px;
            height: 60px;
            background: var(--primary-light);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 1.6rem;
            color: var(--primary);
            transition: background var(--transition), color var(--transition);
        }
        .overview-card:hover .icon-box {
            background: var(--primary);
            color: var(--text-white);
        }
        .overview-card h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .overview-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== Feature Modules ===== */
        .feature-modules {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .feature-card .card-head {
            padding: 24px 24px 0;
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }
        .feature-card .card-head i {
            font-size: 1.8rem;
            color: var(--primary);
            background: var(--primary-light);
            padding: 14px;
            border-radius: 14px;
            flex-shrink: 0;
        }
        .feature-card .card-head h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .feature-card .card-head .tag {
            display: inline-block;
            background: var(--secondary-light);
            color: var(--secondary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 30px;
        }
        .feature-card .card-body {
            padding: 16px 24px 24px;
        }
        .feature-card .card-body p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 14px;
        }
        .feature-card .card-body ul {
            display: grid;
            gap: 8px;
        }
        .feature-card .card-body ul li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .feature-card .card-body ul li i {
            color: var(--secondary);
            font-size: 0.8rem;
            width: 18px;
        }

        /* ===== Process / Flow ===== */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
            counter-reset: step;
            position: relative;
        }
        .process-steps::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: var(--border-color);
            z-index: 0;
        }
        .process-step {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--bg-card);
            padding: 24px 16px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .process-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .process-step .step-num {
            width: 48px;
            height: 48px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
            margin: 0 auto 16px;
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.25);
        }
        .process-step h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .process-step p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== Best Practice ===== */
        .practice-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .practice-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            gap: 16px;
            align-items: flex-start;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .practice-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-sm);
        }
        .practice-item .pi-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            background: var(--primary-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.2rem;
        }
        .practice-item h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .practice-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: grid;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            text-align: left;
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-section);
        }
        .faq-question:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: -3px;
        }
        .faq-question i {
            color: var(--primary);
            font-size: 0.85rem;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 72px 0;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-cta-white {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--text-white);
            color: var(--primary);
            border: none;
            border-radius: 30px;
            padding: 16px 40px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .cta-section .btn-cta-white:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
            color: var(--primary);
        }
        .cta-section .btn-cta-white:active {
            transform: scale(0.97);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 60px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: var(--text-white);
            margin-bottom: 14px;
        }
        .footer-brand .logo i {
            color: #60a5fa;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
            margin-bottom: 18px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 10px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--text-white);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--text-white);
        }

        /* ===== Mobile Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .page-hero-content h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-height: 60px;
            }
            .header-inner {
                padding: 0 16px;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--bg-body);
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
                flex-direction: column;
                padding: 12px 16px;
                gap: 4px;
                z-index: 999;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 16px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .main-nav a.active {
                background: var(--primary);
                color: var(--text-white);
            }
            .menu-toggle {
                display: block;
            }
            .header-search input {
                width: 100px;
            }
            .btn-cta-nav {
                padding: 8px 16px;
                font-size: 0.85rem;
            }

            .page-hero {
                padding: 48px 0 40px;
            }
            .page-hero .container {
                flex-direction: column;
            }
            .page-hero-content h1 {
                font-size: 1.8rem;
            }
            .page-hero-content p {
                font-size: 1rem;
            }
            .page-hero-visual .hero-illustration {
                padding: 20px;
            }
            .hero-illustration .icon-row i {
                width: 56px;
                height: 56px;
                font-size: 2rem;
            }

            .section {
                padding: 48px 0;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
            .overview-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .feature-modules {
                grid-template-columns: 1fr;
            }
            .process-steps {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .process-steps::before {
                display: none;
            }
            .practice-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-hero-content h1 {
                font-size: 1.5rem;
            }
            .overview-grid {
                grid-template-columns: 1fr;
            }
            .process-steps {
                grid-template-columns: 1fr;
            }
            .page-hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .page-hero-actions .btn-primary,
            .page-hero-actions .btn-outline {
                width: 100%;
                justify-content: center;
            }
            .header-search input {
                width: 80px;
            }
            .header-actions .btn-cta-nav span {
                display: none;
            }
            .section-title h2 {
                font-size: 1.4rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section .btn-cta-white {
                width: 100%;
                justify-content: center;
            }
            .feature-card .card-head {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .feature-card .card-body ul li {
                font-size: 0.85rem;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3a6b;
            --primary-light: #2563eb;
            --primary-dark: #0f2347;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg-body: #ffffff;
            --bg-section: #f8fafc;
            --bg-card: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #334155;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --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, 0.06), 0 2px 6px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== 基础重置 ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

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

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

        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--primary);
        }

        a:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 2px;
        }

        ul,
        ol {
            list-style: none;
        }

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

        /* ===== 容器 ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .container-narrow {
            max-width: 820px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .section {
            padding: 80px 0;
        }

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

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.25;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 600px;
            margin-bottom: 48px;
            line-height: 1.6;
        }

        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }

        .section-header .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
            white-space: nowrap;
        }

        .logo i {
            font-size: 1.5rem;
            color: var(--primary-light);
        }

        .logo:hover {
            color: var(--primary-light);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all var(--transition);
            position: relative;
        }

        .main-nav a:hover {
            color: var(--primary);
            background: rgba(37, 99, 235, 0.06);
        }

        .main-nav a.active {
            color: var(--primary-light);
            background: rgba(37, 99, 235, 0.10);
            font-weight: 600;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .search-wrap {
            display: flex;
            align-items: center;
            background: var(--bg-section);
            border-radius: 100px;
            padding: 0 16px;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }

        .search-wrap:focus-within {
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.10);
        }

        .search-wrap i {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .search-wrap input {
            border: none;
            background: transparent;
            padding: 8px 10px;
            font-size: 0.9rem;
            color: var(--text-primary);
            outline: none;
            width: 160px;
        }

        .search-wrap input::placeholder {
            color: var(--text-muted);
        }

        .btn-cta-nav {
            padding: 8px 22px;
            border-radius: 100px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.9rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            white-space: nowrap;
        }

        .btn-cta-nav:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 6px 4px;
            background: none;
            border: none;
        }

        .hamburger span {
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: all var(--transition);
        }

        /* ===== 面包屑 ===== */
        .breadcrumb-wrap {
            padding: 24px 0 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .breadcrumb-wrap a {
            color: var(--text-muted);
            text-decoration: none;
        }

        .breadcrumb-wrap a:hover {
            color: var(--primary-light);
        }

        .breadcrumb-wrap .sep {
            margin: 0 8px;
            color: var(--border-color);
        }

        .breadcrumb-wrap .current {
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ===== 文章页面 ===== */
        .article-page {
            padding: 40px 0 80px;
        }

        .article-header {
            margin-bottom: 40px;
        }

        .article-category {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            background: rgba(37, 99, 235, 0.10);
            color: var(--primary-light);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 16px;
            text-decoration: none;
        }

        .article-category:hover {
            background: rgba(37, 99, 235, 0.18);
            color: var(--primary);
        }

        .article-title {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 18px;
            font-size: 0.9rem;
            color: var(--text-muted);
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border-color);
        }

        .article-meta i {
            margin-right: 6px;
            font-size: 0.85rem;
        }

        .article-meta .meta-item {
            display: flex;
            align-items: center;
        }

        /* ===== 文章正文 ===== */
        .article-content {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text-secondary);
        }

        .article-content p {
            margin-bottom: 1.6em;
        }

        .article-content h2 {
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-top: 2.2em;
            margin-bottom: 0.8em;
            line-height: 1.3;
        }

        .article-content h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            line-height: 1.35;
        }

        .article-content h4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-top: 1.5em;
            margin-bottom: 0.4em;
        }

        .article-content ul,
        .article-content ol {
            margin-bottom: 1.6em;
            padding-left: 1.6em;
        }

        .article-content ul li {
            list-style: disc;
            margin-bottom: 0.4em;
        }

        .article-content ol li {
            list-style: decimal;
            margin-bottom: 0.4em;
        }

        .article-content blockquote {
            border-left: 4px solid var(--primary-light);
            background: var(--bg-section);
            padding: 16px 24px;
            margin: 1.6em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }

        .article-content blockquote p:last-child {
            margin-bottom: 0;
        }

        .article-content img {
            border-radius: var(--radius-md);
            margin: 2em auto;
            box-shadow: var(--shadow-md);
        }

        .article-content a {
            color: var(--primary-light);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .article-content a:hover {
            color: var(--primary);
        }

        .article-content code {
            font-family: "SF Mono", "Fira Code", "Consolas", monospace;
            background: var(--bg-section);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--primary);
        }

        .article-content pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 1.6em 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .article-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
            font-size: inherit;
        }

        .article-content hr {
            border: none;
            height: 1px;
            background: var(--border-color);
            margin: 2.4em 0;
        }

        /* ===== 文章底部 ===== */
        .article-footer {
            margin-top: 48px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .article-tags .tag {
            padding: 4px 14px;
            border-radius: 100px;
            background: var(--bg-section);
            color: var(--text-muted);
            font-size: 0.85rem;
            font-weight: 500;
            text-decoration: none;
            transition: all var(--transition);
            border: 1px solid var(--border-color);
        }

        .article-tags .tag:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .article-share span {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg-section);
            color: var(--text-muted);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            font-size: 0.95rem;
            text-decoration: none;
        }

        .article-share a:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 24px;
            max-width: 560px;
            margin: 0 auto;
        }

        .not-found-box i {
            font-size: 3.6rem;
            color: var(--text-muted);
            margin-bottom: 24px;
            opacity: 0.5;
        }

        .not-found-box h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .not-found-box p {
            color: var(--text-muted);
            font-size: 1.05rem;
            margin-bottom: 28px;
        }

        .not-found-box .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 100px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition);
        }

        .not-found-box .btn-back:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            padding: 72px 0 88px;
            background: var(--bg-section);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .related-card .card-img {
            height: 180px;
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 2.4rem;
            opacity: 0.85;
        }

        .related-card .card-body {
            padding: 20px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .related-card .card-cat {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--primary-light);
            margin-bottom: 8px;
            display: block;
        }

        .related-card .card-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.4;
            margin-bottom: 10px;
            transition: color var(--transition);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card:hover .card-title {
            color: var(--primary-light);
        }

        .related-card .card-excerpt {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 14px;
        }

        .related-card .card-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }

        .related-card .card-meta i {
            margin-right: 4px;
        }

        /* ===== CTA 区域 ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            color: #fff;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }

        .cta-section p {
            font-size: 1.1rem;
            opacity: 0.85;
            max-width: 600px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }

        .cta-section .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 38px;
            border-radius: 100px;
            background: #fff;
            color: var(--primary);
            font-weight: 700;
            font-size: 1.05rem;
            border: none;
            cursor: pointer;
            text-decoration: none;
            transition: all var(--transition);
        }

        .cta-section .btn-cta:hover {
            background: var(--accent-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.20);
        }

        .cta-section .btn-cta i {
            font-size: 1.1rem;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 64px 0 0;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .site-footer .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
            font-size: 1.3rem;
        }

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

        .site-footer .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            opacity: 0.7;
            max-width: 320px;
            margin-bottom: 20px;
        }

        .site-footer .footer-social {
            display: flex;
            gap: 12px;
        }

        .site-footer .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: #94a3b8;
            transition: all var(--transition);
            font-size: 1rem;
            text-decoration: none;
        }

        .site-footer .footer-social a:hover {
            background: var(--primary-light);
            color: #fff;
            transform: translateY(-2px);
        }

        .site-footer .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 18px;
        }

        .site-footer .footer-col ul li {
            margin-bottom: 10px;
        }

        .site-footer .footer-col ul li a {
            color: #94a3b8;
            font-size: 0.9rem;
            text-decoration: none;
            transition: color var(--transition);
        }

        .site-footer .footer-col ul li a:hover {
            color: #fff;
        }

        .site-footer .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 0.85rem;
            opacity: 0.6;
            gap: 12px;
        }

        .site-footer .footer-bottom a {
            color: #94a3b8;
            text-decoration: none;
        }

        .site-footer .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .site-footer .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 900px) {
            .main-nav {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 16px 24px 24px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-lg);
                gap: 4px;
            }

            .main-nav.open {
                display: flex;
            }

            .main-nav a {
                padding: 12px 16px;
                font-size: 1rem;
                width: 100%;
                border-radius: var(--radius-sm);
            }

            .hamburger {
                display: flex;
            }

            .nav-actions .search-wrap {
                display: none;
            }

            .article-title {
                font-size: 1.8rem;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .cta-section h2 {
                font-size: 1.7rem;
            }
        }

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }

            .article-page {
                padding: 24px 0 56px;
            }

            .article-title {
                font-size: 1.5rem;
            }

            .article-content {
                font-size: 1rem;
                line-height: 1.8;
            }

            .article-content h2 {
                font-size: 1.4rem;
            }

            .article-content h3 {
                font-size: 1.15rem;
            }

            .related-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

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

            .site-footer .footer-brand {
                grid-column: 1 / -1;
            }

            .cta-section {
                padding: 56px 0;
            }

            .cta-section h2 {
                font-size: 1.4rem;
            }

            .cta-section p {
                font-size: 1rem;
            }

            .article-footer {
                flex-direction: column;
                align-items: flex-start;
            }

            .breadcrumb-wrap {
                font-size: 0.8rem;
            }
        }

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

            .section-title {
                font-size: 1.35rem;
            }

            .article-title {
                font-size: 1.3rem;
            }

            .article-meta {
                font-size: 0.8rem;
                gap: 10px;
                flex-wrap: wrap;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

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

            .nav-actions .btn-cta-nav {
                padding: 6px 16px;
                font-size: 0.8rem;
            }

            .logo {
                font-size: 1.1rem;
            }

            .logo i {
                font-size: 1.2rem;
            }

            .related-card .card-img {
                height: 140px;
            }

            .not-found-box {
                padding: 48px 16px;
            }

            .not-found-box i {
                font-size: 2.6rem;
            }

            .not-found-box h2 {
                font-size: 1.4rem;
            }
        }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0a4b7a;
            --primary-dark: #072f4f;
            --primary-light: #1a7bbf;
            --secondary: #e8a838;
            --secondary-light: #f5c86a;
            --accent: #2b8c6e;
            --bg-light: #f6f9fc;
            --bg-white: #ffffff;
            --bg-dark: #0d1b2a;
            --text-dark: #1a2a3a;
            --text-body: #3a4a5a;
            --text-light: #6a7a8a;
            --text-white: #f0f4f8;
            --border: #dce4ec;
            --border-light: #e9eef3;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(10, 75, 122, 0.06);
            --shadow: 0 6px 24px rgba(10, 75, 122, 0.10);
            --shadow-lg: 0 16px 48px rgba(10, 75, 122, 0.14);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-family);
            font-size: 1rem;
            line-height: 1.6;
            color: var(--text-body);
            background: var(--bg-white);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-dark);
            line-height: 1.3;
            font-weight: 600;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 2px 12px rgba(10, 75, 122, 0.04);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary-dark) !important;
            letter-spacing: -0.02em;
        }
        .logo i {
            font-size: 1.6rem;
            color: var(--secondary);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: rgba(10, 75, 122, 0.05);
        }
        .main-nav a.active {
            color: var(--bg-white);
            background: var(--primary);
            box-shadow: 0 4px 12px rgba(10, 75, 122, 0.20);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .nav-search {
            display: flex;
            align-items: center;
            background: var(--bg-light);
            border: 1px solid var(--border-light);
            border-radius: 40px;
            padding: 0 16px;
            transition: all var(--transition);
        }
        .nav-search:focus-within {
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(26, 123, 191, 0.12);
        }
        .nav-search input {
            border: none;
            background: transparent;
            padding: 8px 10px;
            font-size: 0.9rem;
            color: var(--text-dark);
            outline: none;
            min-width: 160px;
        }
        .nav-search input::placeholder {
            color: var(--text-light);
        }
        .nav-search button {
            border: none;
            background: transparent;
            color: var(--text-light);
            cursor: pointer;
            padding: 6px;
            font-size: 0.95rem;
            transition: color var(--transition);
        }
        .nav-search button:hover {
            color: var(--primary);
        }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--secondary);
            color: var(--primary-dark) !important;
            font-weight: 600;
            padding: 10px 24px;
            border-radius: 40px;
            font-size: 0.9rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 14px rgba(232, 168, 56, 0.30);
        }
        .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(232, 168, 56, 0.40);
            background: var(--secondary-light);
            color: var(--primary-dark) !important;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text-dark);
            cursor: pointer;
            padding: 4px 8px;
        }
        @media (max-width: 1024px) {
            .main-nav {
                gap: 4px;
            }
            .main-nav a {
                padding: 6px 14px;
                font-size: 0.85rem;
            }
            .nav-search input {
                min-width: 100px;
            }
        }
        @media (max-width: 768px) {
            .site-header {
                height: auto;
                padding: 12px 0;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: var(--bg-white);
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                padding: 16px 24px 24px;
                border-bottom: 2px solid var(--border-light);
                box-shadow: var(--shadow);
                gap: 8px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
            }
            .hamburger {
                display: block;
            }
            .nav-actions .btn-cta {
                display: none;
            }
            .nav-search {
                flex: 1;
                max-width: 200px;
            }
            .nav-search input {
                min-width: 80px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .logo {
                font-size: 1.1rem;
            }
            .logo i {
                font-size: 1.3rem;
            }
            .nav-search input {
                min-width: 60px;
                font-size: 0.8rem;
            }
            .nav-search {
                padding: 0 10px;
            }
        }

        /* ===== Hero ===== */
        .page-hero {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            padding: 80px 0 72px;
            position: relative;
            overflow: hidden;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.5;
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .page-hero h1 {
            font-size: 3rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .page-hero p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .page-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            padding: 8px 20px;
            border-radius: 40px;
            color: var(--text-white);
            font-size: 0.9rem;
            font-weight: 500;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .page-hero .hero-badge i {
            color: var(--secondary);
        }
        @media (max-width: 768px) {
            .page-hero {
                padding: 56px 0 48px;
            }
            .page-hero h1 {
                font-size: 2.2rem;
            }
            .page-hero p {
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 1.6rem;
            }
            .page-hero p {
                font-size: 0.9rem;
            }
            .page-hero .hero-badge {
                font-size: 0.8rem;
                padding: 6px 14px;
            }
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 80px 0;
        }
        .section-bg {
            background: var(--bg-light);
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-dark);
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .section-sub {
            font-size: 1.1rem;
            color: var(--text-light);
            text-align: center;
            max-width: 600px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .section-sub {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }
        }
        @media (max-width: 520px) {
            .section {
                padding: 40px 0;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .section-sub {
                font-size: 0.85rem;
                margin-bottom: 24px;
            }
        }

        /* ===== 卡片网格 ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .grid-3,
            .grid-2 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        .card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 32px 28px;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: var(--border);
        }
        .card .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--bg-white);
            margin-bottom: 20px;
            background: var(--primary);
        }
        .card .card-icon.gold {
            background: var(--secondary);
            color: var(--primary-dark);
        }
        .card .card-icon.teal {
            background: var(--accent);
        }
        .card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 10px;
        }
        .card p {
            font-size: 0.95rem;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 0;
        }
        .card .card-tag {
            display: inline-block;
            background: var(--bg-light);
            border: 1px solid var(--border-light);
            border-radius: 40px;
            padding: 4px 14px;
            font-size: 0.75rem;
            font-weight: 500;
            color: var(--text-light);
            margin-top: 16px;
        }
        .card-featured {
            border-left: 4px solid var(--secondary);
            background: linear-gradient(135deg, var(--bg-white) 0%, #fefcf5 100%);
        }

        /* ===== 数据/统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            text-align: center;
        }
        .stat-item {
            padding: 24px 16px;
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .stat-item .stat-num {
            font-size: 2.6rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 0.95rem;
            color: var(--text-light);
            margin-top: 6px;
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .stat-num {
                font-size: 2rem;
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 16px 12px;
            }
            .stat-item .stat-num {
                font-size: 1.6rem;
            }
        }

        /* ===== 列表/特性 ===== */
        .feature-list {
            display: grid;
            gap: 20px;
        }
        .feature-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            padding: 20px 24px;
            background: var(--bg-white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .feature-item:hover {
            border-color: var(--border);
            box-shadow: var(--shadow-sm);
        }
        .feature-item .fi-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--bg-white);
            background: var(--primary-light);
            flex-shrink: 0;
        }
        .feature-item .fi-icon.gold {
            background: var(--secondary);
            color: var(--primary-dark);
        }
        .feature-item .fi-icon.teal {
            background: var(--accent);
        }
        .feature-item .fi-content h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 4px;
        }
        .feature-item .fi-content p {
            font-size: 0.9rem;
            color: var(--text-body);
            line-height: 1.6;
            margin: 0;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 780px;
            margin: 0 auto;
            display: grid;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
            gap: 12px;
        }
        .faq-question:hover {
            background: var(--bg-light);
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--text-light);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--text-body);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }
        @media (max-width: 520px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 0.85rem;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            padding: 72px 0;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .cta-section .btn-cta {
            font-size: 1.05rem;
            padding: 14px 36px;
            background: var(--secondary);
            color: var(--primary-dark) !important;
        }
        .cta-section .btn-cta:hover {
            background: var(--secondary-light);
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(232, 168, 56, 0.40);
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 1.7rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
        }
        @media (max-width: 520px) {
            .cta-section h2 {
                font-size: 1.4rem;
            }
            .cta-section p {
                font-size: 0.85rem;
            }
            .cta-section .btn-cta {
                font-size: 0.9rem;
                padding: 12px 28px;
            }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            color: var(--text-white) !important;
            font-size: 1.3rem;
            margin-bottom: 12px;
        }
        .footer-brand .logo i {
            color: var(--secondary);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 320px;
            margin-bottom: 18px;
        }
        .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--secondary);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--secondary);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer {
                padding: 32px 0 0;
            }
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 16px 0 0;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--secondary);
        }
        .breadcrumb span {
            color: var(--secondary);
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== 安全协议卡片（特殊） ===== */
        .protocol-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .protocol-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .protocol-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .protocol-item .pi-badge {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--bg-light);
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .protocol-item .pi-badge.active {
            background: #e6f7f0;
            color: var(--accent);
        }
        .protocol-item h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 6px;
        }
        .protocol-item p {
            font-size: 0.85rem;
            color: var(--text-light);
            margin: 0;
        }
        @media (max-width: 1024px) {
            .protocol-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .protocol-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .protocol-item {
                padding: 20px 12px;
            }
        }

        /* ===== 内页微调 ===== */
        .badge-light {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.12);
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.8rem;
            color: var(--text-white);
            border: 1px solid rgba(255, 255, 255, 0.10);
        }

        /* ===== 按钮通用 ===== */
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 2px solid rgba(255, 255, 255, 0.30);
            color: var(--text-white);
            padding: 10px 28px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            background: transparent;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(255, 255, 255, 0.50);
            color: var(--text-white);
        }

        /* ===== 响应式辅助 ===== */
        @media (max-width: 768px) {
            .hide-mobile {
                display: none !important;
            }
        }
        @media (min-width: 769px) {
            .hide-desktop {
                display: none !important;
            }
        }