/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #0d1b2a;
            --primary-light: #1b3a5c;
            --primary-dark: #070f1a;
            --accent: #e8a838;
            --accent-hover: #d4952f;
            --accent-light: #f5d58a;
            --bg: #f5f7fa;
            --bg-white: #ffffff;
            --bg-dark: #0d1b2a;
            --bg-card: #ffffff;
            --text: #1a1a2e;
            --text-light: #6c757d;
            --text-white: #ffffff;
            --text-muted: #9aa4b0;
            --border: #e8ecef;
            --border-light: #f0f2f5;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 30px;
            --radius-pill: 50px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
            --shadow: 0 10px 30px rgba(0,0,0,0.08);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
            --shadow-hover: 0 16px 48px rgba(0,0,0,0.15);
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
            --container-max: 1200px;
            --nav-height: 68px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--accent); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent-hover); }
        ul, ol { list-style: none; padding: 0; margin: 0; }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }
        @media screen and (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== Section Spacing ===== */
        .section { padding: 80px 0; }
        .section-sm { padding: 48px 0; }
        .section-lg { padding: 120px 0; }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-light);
            font-size: 1.1rem;
            max-width: 640px;
            margin: 0 auto 48px;
            line-height: 1.6;
        }
        .section-title-left { text-align: left; }
        .section-subtitle-left { text-align: left; margin-left: 0; }

        @media screen and (max-width: 768px) {
            .section { padding: 48px 0; }
            .section-lg { padding: 64px 0; }
            .section-title { font-size: 1.6rem; }
            .section-subtitle { font-size: 1rem; margin-bottom: 32px; }
        }

        /* ===== Navigation — 悬浮胶囊风格 ===== */
        .site-header {
            position: fixed;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1000;
            width: calc(100% - 32px);
            max-width: var(--container-max);
            background: rgba(13, 27, 42, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-radius: var(--radius-pill);
            padding: 0 28px;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(13, 27, 42, 0.96);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
        }
        .site-logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
        }
        .site-logo i { color: var(--accent); font-size: 1.6rem; }
        .site-logo span { background: linear-gradient(135deg, var(--accent), #f0c060); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-links { display: flex; align-items: center; gap: 6px; }
        .nav-links a {
            padding: 8px 20px;
            border-radius: var(--radius-pill);
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover { background: rgba(255, 255, 255, 0.1); color: var(--text-white); }
        .nav-links a.active { background: var(--accent); color: var(--primary); font-weight: 700; }
        .nav-toggle { display: none; color: var(--text-white); font-size: 1.5rem; padding: 4px 8px; border-radius: var(--radius-sm); background: rgba(255,255,255,0.08); }
        .nav-toggle:hover { background: rgba(255,255,255,0.15); }

        @media screen and (max-width: 768px) {
            .site-header { top: 12px; padding: 0 16px; height: 60px; }
            .site-logo { font-size: 1.1rem; }
            .nav-links { display: none; position: absolute; top: calc(100% + 12px); left: 0; right: 0; background: rgba(13,27,42,0.98); border-radius: var(--radius); padding: 12px; flex-direction: column; gap: 4px; box-shadow: var(--shadow-lg); border: 1px solid rgba(255,255,255,0.08); }
            .nav-links.open { display: flex; }
            .nav-links a { padding: 10px 16px; width: 100%; border-radius: var(--radius-sm); }
            .nav-toggle { display: block; }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.55;
            transform: scale(1.05);
            animation: heroZoom 20s ease-in-out infinite alternate;
        }
        @keyframes heroZoom { 0% { transform: scale(1); } 100% { transform: scale(1.08); } }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, rgba(13,27,42,0.4) 0%, rgba(7,15,26,0.85) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
            padding: 0 24px;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(232, 168, 56, 0.18);
            border: 1px solid rgba(232, 168, 56, 0.3);
            color: var(--accent-light);
            padding: 6px 20px;
            border-radius: var(--radius-pill);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            font-size: 3.6rem;
            font-weight: 900;
            color: var(--text-white);
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }
        .hero h1 span { background: linear-gradient(135deg, var(--accent), #f5d58a); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 600px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: var(--radius-pill);
            font-size: 1rem;
            font-weight: 700;
            transition: var(--transition);
            border: 2px solid transparent;
            cursor: pointer;
        }
        .btn-primary { background: var(--accent); color: var(--primary); border-color: var(--accent); }
        .btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 12px 32px rgba(232,168,56,0.35); color: var(--primary); }
        .btn-outline { background: transparent; color: var(--text-white); border-color: rgba(255,255,255,0.3); }
        .btn-outline:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.6); transform: translateY(-2px); color: var(--text-white); }
        .btn-lg { padding: 18px 48px; font-size: 1.1rem; }
        .btn-sm { padding: 10px 24px; font-size: 0.9rem; }

        @media screen and (max-width: 768px) {
            .hero h1 { font-size: 2.2rem; }
            .hero p { font-size: 1rem; }
            .hero-actions { flex-direction: column; align-items: center; }
            .btn { width: 100%; max-width: 300px; justify-content: center; }
        }

        /* ===== Cards & Grid ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border);
            height: 100%;
        }
        .card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
        .card-image { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; display: block; }
        .card-body { padding: 24px; }
        .card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
        .card-text { color: var(--text-light); font-size: 0.95rem; line-height: 1.6; }
        .card-tag {
            display: inline-block;
            background: rgba(232, 168, 56, 0.12);
            color: var(--accent-hover);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 12px;
        }
        .card-meta { display: flex; align-items: center; gap: 16px; color: var(--text-muted); font-size: 0.85rem; margin-top: 12px; }
        .card-meta i { font-size: 0.75rem; }

        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

        @media screen and (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
        }
        @media screen and (max-width: 768px) {
            .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 20px; }
        }

        /* ===== Feature / Icon Cards ===== */
        .feature-card {
            text-align: center;
            padding: 36px 24px;
            border-radius: var(--radius);
            background: var(--bg-card);
            border: 1px solid var(--border);
            transition: var(--transition);
            height: 100%;
        }
        .feature-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: var(--accent); }
        .feature-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            color: var(--accent);
            background: rgba(232, 168, 56, 0.1);
        }
        .feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
        .feature-card p { color: var(--text-light); font-size: 0.95rem; line-height: 1.6; }

        /* ===== Stats ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .stat-item { text-align: center; padding: 32px 16px; }
        .stat-number { font-size: 2.8rem; font-weight: 900; color: var(--accent); line-height: 1.2; margin-bottom: 6px; }
        .stat-label { color: var(--text-light); font-size: 0.95rem; font-weight: 500; }
        @media screen and (max-width: 768px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

        /* ===== Steps ===== */
        .steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; position: relative; }
        .step { text-align: center; position: relative; }
        .step-number {
            width: 56px; height: 56px;
            border-radius: 50%;
            background: var(--accent);
            color: var(--primary);
            font-size: 1.4rem;
            font-weight: 900;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            position: relative;
            z-index: 2;
        }
        .step h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
        .step p { color: var(--text-light); font-size: 0.95rem; line-height: 1.6; }
        .steps::before {
            content: '';
            position: absolute;
            top: 28px;
            left: 15%;
            right: 15%;
            height: 2px;
            background: var(--border);
            z-index: 0;
        }
        @media screen and (max-width: 768px) {
            .steps { grid-template-columns: 1fr; gap: 32px; }
            .steps::before { display: none; }
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            margin-bottom: 16px;
            padding: 0;
            border: 1px solid var(--border);
            transition: var(--transition);
            overflow: hidden;
        }
        .faq-item:hover { border-color: var(--accent-light); }
        .faq-question {
            padding: 20px 24px;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover { color: var(--accent); }
        .faq-question i { transition: var(--transition); color: var(--text-muted); font-size: 0.9rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--accent); }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p { color: var(--text-light); line-height: 1.7; font-size: 0.95rem; }

        /* ===== CTA Section ===== */
        .cta-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.1;
        }
        .cta-content { position: relative; z-index: 2; text-align: center; padding: 80px 0; }
        .cta-content h2 { font-size: 2.4rem; font-weight: 800; color: var(--text-white); margin-bottom: 16px; }
        .cta-content p { color: rgba(255,255,255,0.7); font-size: 1.1rem; max-width: 560px; margin: 0 auto 32px; }
        .cta-content .btn { margin: 0 8px; }
        @media screen and (max-width: 768px) {
            .cta-content h2 { font-size: 1.6rem; }
            .cta-content p { font-size: 1rem; }
            .cta-content .btn { margin: 8px 0; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.7);
            padding: 48px 0 24px;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
        .footer-brand .site-logo { margin-bottom: 16px; }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 320px; color: rgba(255,255,255,0.5); }
        .footer-col h5 { color: var(--text-white); font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
        .footer-col a { display: block; color: rgba(255,255,255,0.5); font-size: 0.9rem; padding: 4px 0; transition: var(--transition); }
        .footer-col a:hover { color: var(--accent); padding-left: 4px; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 24px; margin-top: 40px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
        .footer-bottom p { font-size: 0.85rem; color: rgba(255,255,255,0.35); }
        .footer-socials { display: flex; gap: 12px; }
        .footer-socials a { width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.06); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.5); transition: var(--transition); font-size: 1rem; }
        .footer-socials a:hover { background: var(--accent); color: var(--primary); }

        @media screen and (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        @media screen and (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; }
        }

        /* ===== Misc Utilities ===== */
        .text-center { text-align: center; }
        .text-accent { color: var(--accent); }
        .bg-white { background: var(--bg-white); }
        .bg-light { background: var(--bg); }
        .bg-dark { background: var(--bg-dark); }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }
        .mb-32 { margin-bottom: 32px; }
        .mb-48 { margin-bottom: 48px; }
        .gap-16 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .empty-state { padding: 40px 20px; text-align: center; color: var(--text-muted); font-size: 1rem; background: var(--bg-card); border-radius: var(--radius); border: 1px dashed var(--border); }
        .empty-state i { font-size: 2rem; margin-bottom: 12px; display: block; color: var(--border); }

        /* ===== Article Page Specific ===== */
        .article-header { background: var(--primary); position: relative; padding: 140px 0 60px; }
        .article-header::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat; opacity: 0.12; }
        .article-header-inner { position: relative; z-index: 2; max-width: 800px; margin: 0 auto; text-align: center; }
        .article-header h1 { font-size: 2.4rem; font-weight: 800; color: var(--text-white); margin-bottom: 16px; }
        .article-header .meta { color: rgba(255,255,255,0.6); font-size: 0.9rem; display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; }
        .article-body { max-width: 800px; margin: 0 auto; padding: 48px 0; }
        .article-body p { margin-bottom: 20px; font-size: 1.05rem; line-height: 1.8; color: var(--text); }
        .article-body img { border-radius: var(--radius); margin: 32px 0; width: 100%; }
        .article-body h2, .article-body h3 { margin-top: 40px; margin-bottom: 16px; }
        .article-body h2 { font-size: 1.6rem; }
        .article-body h3 { font-size: 1.3rem; }
        .article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 20px; }
        .article-body li { margin-bottom: 8px; line-height: 1.7; list-style: disc; }
        .article-body blockquote { border-left: 4px solid var(--accent); padding: 16px 24px; background: rgba(232,168,56,0.06); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 24px 0; }
        .article-body blockquote p { margin: 0; color: var(--text-light); }

        /* ===== Category Page ===== */
        .category-banner {
            background: var(--primary);
            position: relative;
            padding: 140px 0 60px;
        }
        .category-banner::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat; opacity: 0.12; }
        .category-banner-inner { position: relative; z-index: 2; text-align: center; }
        .category-banner h1 { font-size: 2.4rem; font-weight: 800; color: var(--text-white); margin-bottom: 12px; }
        .category-banner p { color: rgba(255,255,255,0.7); font-size: 1.1rem; max-width: 560px; margin: 0 auto; }

        .cat-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 28px 24px;
            transition: var(--transition);
            height: 100%;
        }
        .cat-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); border-color: var(--accent); }
        .cat-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
        .cat-card p { color: var(--text-light); font-size: 0.9rem; line-height: 1.6; margin-bottom: 12px; }
        .cat-card .btn-sm { margin-top: auto; }

        /* ===== Responsive Fine-tune ===== */
        @media screen and (max-width: 520px) {
            .hero h1 { font-size: 1.8rem; }
            .section-title { font-size: 1.4rem; }
            .stat-number { font-size: 2rem; }
            .btn-lg { padding: 14px 32px; font-size: 1rem; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a4b8c;
            --primary-light: #2a6fc4;
            --primary-dark: #0f2f5a;
            --primary-gradient: linear-gradient(135deg, #1a4b8c 0%, #2a6fc4 100%);
            --secondary: #f5b042;
            --secondary-light: #f8c56a;
            --accent: #e84c3d;
            --bg-light: #f7f9fc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f1a2b;
            --text-dark: #1a2a3a;
            --text-body: #3a4a5a;
            --text-muted: #7a8a9a;
            --text-light: #f0f4f8;
            --border: #e2e8f0;
            --border-light: #f0f2f5;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(26, 75, 140, 0.06);
            --shadow-md: 0 6px 24px rgba(26, 75, 140, 0.10);
            --shadow-lg: 0 16px 48px rgba(26, 75, 140, 0.14);
            --shadow-hover: 0 20px 56px rgba(26, 75, 140, 0.20);
            --transition: 0.30s ease;
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, 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-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-family);
            color: var(--text-body);
            background: var(--bg-light);
            line-height: 1.6;
            font-size: 16px;
            padding-top: var(--header-height);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus {
            color: var(--primary-light);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-padding {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 56px 0;
            }
            .container {
                padding: 0 18px;
            }
            body {
                font-size: 15px;
            }
        }
        @media (max-width: 520px) {
            .section-padding {
                padding: 40px 0;
            }
            .container {
                padding: 0 14px;
            }
            body {
                font-size: 14px;
            }
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 28px;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: 0 4px 28px rgba(0, 0, 0, 0.08);
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.3px;
            transition: opacity var(--transition);
        }
        .site-logo:hover {
            opacity: 0.85;
            color: var(--primary);
        }
        .site-logo i {
            font-size: 26px;
            color: var(--secondary);
        }
        .site-logo span {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-links a {
            padding: 8px 20px;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            transition: background var(--transition), color var(--transition), box-shadow var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            background: rgba(26, 75, 140, 0.06);
            color: var(--primary);
        }
        .nav-links a.active {
            background: var(--primary-gradient);
            color: #fff;
            box-shadow: 0 4px 16px rgba(26, 75, 140, 0.25);
        }
        .nav-links a.active:hover {
            box-shadow: 0 6px 24px rgba(26, 75, 140, 0.35);
            color: #fff;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text-dark);
            padding: 6px 10px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(26, 75, 140, 0.06);
        }
        @media (max-width: 768px) {
            .site-header {
                padding: 0 16px;
            }
            .nav-links {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 8px;
                border-bottom: 1px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: transform 0.35s ease, opacity 0.30s ease;
                box-shadow: 0 20px 48px rgba(0, 0, 0, 0.08);
                border-radius: 0 0 20px 20px;
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-links a {
                width: 100%;
                text-align: center;
                padding: 12px 20px;
                font-size: 16px;
                border-radius: 30px;
            }
            .nav-toggle {
                display: block;
            }
        }
        @media (max-width: 520px) {
            .site-logo {
                font-size: 18px;
            }
            .site-logo i {
                font-size: 20px;
            }
            .nav-links a {
                font-size: 15px;
                padding: 10px 16px;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-light);
            padding: 60px 0 30px;
        }
        .site-footer .container {
            max-width: var(--max-width);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .site-logo {
            margin-bottom: 14px;
            font-size: 20px;
        }
        .footer-brand .site-logo span {
            -webkit-text-fill-color: #fff;
            background: none;
            color: #fff;
        }
        .footer-brand .site-logo i {
            color: var(--secondary);
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h5 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            padding: 5px 0;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col a:hover {
            color: var(--secondary);
            padding-left: 6px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p {
            color: rgba(255, 255, 255, 0.4);
            font-size: 13px;
        }
        .footer-socials {
            display: flex;
            gap: 14px;
        }
        .footer-socials a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.5);
            font-size: 16px;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer-socials a:hover {
            background: var(--secondary);
            color: var(--bg-dark);
            transform: translateY(-3px);
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 600px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        /* ===== 通用组件 ===== */
        .section-title {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 14px;
            line-height: 1.25;
            letter-spacing: -0.5px;
        }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 600px;
            margin-bottom: 40px;
            line-height: 1.6;
        }
        .section-subtitle.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .text-center {
            text-align: center;
        }
        .badge {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 40px;
            font-size: 13px;
            font-weight: 500;
            background: rgba(26, 75, 140, 0.08);
            color: var(--primary);
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }
        .badge.secondary {
            background: rgba(245, 176, 66, 0.15);
            color: #b87a1a;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--primary-gradient);
            color: #fff;
            box-shadow: 0 6px 20px rgba(26, 75, 140, 0.25);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(26, 75, 140, 0.35);
            color: #fff;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(26, 75, 140, 0.20);
        }
        .btn-secondary {
            background: var(--bg-white);
            color: var(--primary);
            border: 2px solid var(--border);
            box-shadow: var(--shadow-sm);
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            background: rgba(26, 75, 140, 0.04);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: var(--primary);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-accent {
            background: linear-gradient(135deg, var(--accent), #d63a2a);
            color: #fff;
            box-shadow: 0 6px 20px rgba(232, 76, 61, 0.25);
        }
        .btn-accent:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(232, 76, 61, 0.35);
            color: #fff;
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 14px;
        }
        .btn i {
            font-size: 15px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-6px);
        }
        .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 24px 22px 26px;
        }
        .card-body h4 {
            font-size: 19px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .card-body p {
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.65;
        }
        .card-body .tag {
            display: inline-block;
            padding: 2px 14px;
            border-radius: 30px;
            font-size: 12px;
            font-weight: 500;
            background: rgba(26, 75, 140, 0.06);
            color: var(--primary);
            margin-bottom: 10px;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            border-radius: var(--radius-md);
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .step-number {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 700;
            margin: 0 auto 18px;
            box-shadow: 0 6px 20px rgba(26, 75, 140, 0.20);
        }
        .step-card h5 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .step-card p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.6;
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
        }
        .stat-number {
            font-size: 42px;
            font-weight: 800;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.1;
            letter-spacing: -1px;
        }
        .stat-label {
            font-size: 15px;
            color: var(--text-muted);
            margin-top: 6px;
        }
        .faq-item {
            border-bottom: 1px solid var(--border);
            padding: 18px 0;
        }
        .faq-item:first-child {
            padding-top: 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-dark);
            cursor: pointer;
            padding: 4px 0;
            transition: color var(--transition);
            user-select: none;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            color: var(--text-muted);
            transition: transform 0.3s ease;
            font-size: 14px;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.40s ease, padding 0.35s ease;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
            padding: 0 20px 0 0;
        }
        .faq-answer.open {
            max-height: 400px;
            padding-top: 14px;
            padding-bottom: 6px;
        }

        /* ===== Hero ===== */
        .hero-guide {
            position: relative;
            padding: 100px 0 80px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            isolation: isolate;
            overflow: hidden;
        }
        .hero-guide::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 43, 0.82) 0%, rgba(26, 75, 140, 0.65) 100%);
            z-index: 1;
        }
        .hero-guide .container {
            position: relative;
            z-index: 2;
        }
        .hero-guide .badge {
            background: rgba(255, 255, 255, 0.12);
            color: var(--secondary);
            backdrop-filter: blur(4px);
        }
        .hero-guide h1 {
            font-size: 48px;
            font-weight: 800;
            color: #fff;
            line-height: 1.15;
            margin-bottom: 16px;
            letter-spacing: -0.8px;
        }
        .hero-guide h1 span {
            color: var(--secondary);
        }
        .hero-guide p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 580px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .hero-guide .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        @media (max-width: 768px) {
            .hero-guide {
                padding: 72px 0 56px;
            }
            .hero-guide h1 {
                font-size: 32px;
            }
            .hero-guide p {
                font-size: 16px;
            }
        }
        @media (max-width: 520px) {
            .hero-guide h1 {
                font-size: 26px;
            }
            .hero-guide p {
                font-size: 14px;
            }
            .hero-guide .btn-group {
                flex-direction: column;
            }
            .hero-guide .btn {
                width: 100%;
                justify-content: center;
            }
        }

        /* ===== 板块样式 ===== */
        .intro-section {
            background: var(--bg-white);
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .intro-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .intro-image:hover img {
            transform: scale(1.03);
        }
        .intro-content h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .intro-content p {
            color: var(--text-muted);
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 12px;
        }
        .intro-content .feature-list {
            margin-top: 18px;
        }
        .intro-content .feature-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 6px 0;
            font-size: 15px;
            color: var(--text-body);
        }
        .intro-content .feature-list li i {
            color: var(--secondary);
            font-size: 16px;
            width: 22px;
            text-align: center;
        }
        @media (max-width: 768px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-content h2 {
                font-size: 26px;
            }
            .intro-image img {
                height: 240px;
            }
        }

        /* ===== 功能卡片 ===== */
        .features-section {
            background: var(--bg-light);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 22px 30px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-8px);
        }
        .feature-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: rgba(26, 75, 140, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 28px;
            color: var(--primary);
            transition: background var(--transition), color var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: #fff;
        }
        .feature-card h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .feature-card p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.65;
        }
        @media (max-width: 900px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .feature-card {
                padding: 22px 18px;
            }
        }

        /* ===== 流程步骤 ===== */
        .steps-section {
            background: var(--bg-white);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        @media (max-width: 900px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
            isolation: isolate;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(15, 26, 43, 0.85);
            z-index: 1;
        }
        .stats-section .container {
            position: relative;
            z-index: 2;
        }
        .stats-section .section-title {
            color: #fff;
        }
        .stats-section .section-subtitle {
            color: rgba(255, 255, 255, 0.6);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 10px;
        }
        .stats-grid .stat-item {
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(6px);
        }
        .stats-grid .stat-number {
            -webkit-text-fill-color: #fff;
            color: #fff;
            background: none;
        }
        .stats-grid .stat-label {
            color: rgba(255, 255, 255, 0.6);
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-number {
                font-size: 32px;
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-number {
                font-size: 28px;
            }
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-white);
        }
        .faq-wrap {
            max-width: 760px;
            margin: 0 auto;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 40px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        @media (max-width: 600px) {
            .faq-wrap {
                padding: 20px 18px;
            }
            .faq-question {
                font-size: 15px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 72px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            top: -60%;
            right: -20%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 540px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .cta-section .btn-group {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 14px;
        }
        .cta-section .btn-white {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
        }
        .cta-section .btn-white:hover {
            background: #fff;
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
            color: var(--primary-dark);
        }
        .cta-section .btn-outline-white {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.4);
        }
        .cta-section .btn-outline-white:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.06);
            transform: translateY(-3px);
            color: #fff;
        }
        @media (max-width: 600px) {
            .cta-section h2 {
                font-size: 26px;
            }
            .cta-section p {
                font-size: 15px;
            }
            .cta-section .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .cta-section .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
        }

        /* ===== 响应式补丁 ===== */
        @media (max-width: 768px) {
            .section-title {
                font-size: 26px;
            }
            .section-subtitle {
                font-size: 15px;
                margin-bottom: 28px;
            }
        }
        @media (max-width: 520px) {
            .section-title {
                font-size: 22px;
            }
            .section-subtitle {
                font-size: 14px;
                margin-bottom: 22px;
            }
        }
        .text-muted-400 {
            color: var(--text-muted);
        }

        /* Foundation 覆盖 */
        .grid-container {
            max-width: var(--max-width);
            padding-left: 24px;
            padding-right: 24px;
        }
        @media (max-width: 768px) {
            .grid-container {
                padding-left: 18px;
                padding-right: 18px;
            }
        }
        @media (max-width: 520px) {
            .grid-container {
                padding-left: 14px;
                padding-right: 14px;
            }
        }
        .cell {
            margin-bottom: 0 !important;
        }
        .grid-x>.cell {
            padding: 0;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0a7e8c;
            --primary-dark: #065a63;
            --primary-light: #12a0b0;
            --primary-soft: #e2f4f7;
            --accent: #f5a623;
            --accent-dark: #d48d1a;
            --accent-soft: #fef3e0;
            --bg: #f8fafb;
            --bg-card: #ffffff;
            --bg-dark: #0d1f23;
            --bg-section: #f0f6f8;
            --text: #1a2b2f;
            --text-light: #5a7075;
            --text-soft: #8a9ea3;
            --border: #dce4e7;
            --border-light: #eef3f5;
            --radius: 16px;
            --radius-sm: 8px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(10, 126, 140, 0.06);
            --shadow: 0 8px 32px rgba(10, 126, 140, 0.10);
            --shadow-lg: 0 20px 60px rgba(10, 126, 140, 0.14);
            --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--nav-height);
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }

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

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

        ul,
        ol {
            list-style: none;
        }

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

        .container-narrow {
            max-width: 840px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px) saturate(180%);
            -webkit-backdrop-filter: blur(20px) saturate(180%);
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
            display: flex;
            align-items: center;
            padding: 0 32px;
        }

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

        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary-dark);
            text-decoration: none;
            letter-spacing: -0.3px;
            flex-shrink: 0;
        }
        .site-logo i {
            font-size: 26px;
            color: var(--primary);
            transition: var(--transition);
        }
        .site-logo:hover i {
            transform: rotate(-8deg) scale(1.05);
        }
        .site-logo:hover {
            color: var(--primary);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-links a {
            position: relative;
            padding: 8px 20px;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            text-decoration: none;
            transition: var(--transition);
            letter-spacing: 0.2px;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: var(--primary-soft);
        }
        .nav-links a.active {
            color: #fff;
            background: var(--primary);
            box-shadow: 0 4px 16px rgba(10, 126, 140, 0.25);
        }
        .nav-links a.active:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 24px rgba(10, 126, 140, 0.35);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text);
            cursor: pointer;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-soft);
            color: var(--primary);
        }

        /* ===== 文章 Hero ===== */
        .article-hero {
            position: relative;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: 80px 0 60px;
            margin-top: 0;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(13, 31, 35, 0.88) 0%, rgba(13, 31, 35, 0.60) 100%);
            z-index: 1;
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
        }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .article-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
            text-decoration: none;
            transition: var(--transition);
        }
        .article-hero .breadcrumb a:hover {
            color: #fff;
        }
        .article-hero .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.35);
        }
        .article-hero .breadcrumb .current {
            color: rgba(255, 255, 255, 0.9);
        }
        .article-hero .hero-category {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 40px;
            background: var(--accent);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 16px;
        }
        .article-hero h1 {
            font-size: 38px;
            font-weight: 800;
            color: #fff;
            line-height: 1.25;
            max-width: 800px;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .article-hero .hero-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }
        .article-hero .hero-meta i {
            margin-right: 6px;
            color: var(--accent);
        }
        .article-hero .hero-meta span {
            display: flex;
            align-items: center;
        }

        /* ===== 文章正文 ===== */
        .article-main {
            padding: 48px 0 64px;
            background: var(--bg);
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 48px 56px;
            border: 1px solid var(--border-light);
        }
        .article-body .featured-image {
            border-radius: var(--radius);
            overflow: hidden;
            margin-bottom: 36px;
            box-shadow: var(--shadow-sm);
        }
        .article-body .featured-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        .article-body .content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text);
        }
        .article-body .content p {
            margin-bottom: 1.4em;
        }
        .article-body .content h2,
        .article-body .content h3 {
            margin-top: 1.6em;
            margin-bottom: 0.6em;
            color: var(--primary-dark);
        }
        .article-body .content ul,
        .article-body .content ol {
            margin-bottom: 1.4em;
            padding-left: 1.6em;
        }
        .article-body .content li {
            margin-bottom: 0.4em;
            list-style: disc;
        }
        .article-body .content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body .content a:hover {
            color: var(--primary-dark);
        }
        .article-body .content img {
            border-radius: var(--radius-sm);
            margin: 1.2em 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-soft);
            padding: 16px 24px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1.4em 0;
            color: var(--text-light);
            font-style: italic;
        }

        /* 标签分享 */
        .article-tags {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
        }
        .article-tags .tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags .tags .tag {
            padding: 4px 14px;
            border-radius: 40px;
            background: var(--primary-soft);
            color: var(--primary-dark);
            font-size: 13px;
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
        }
        .article-tags .tags .tag:hover {
            background: var(--primary);
            color: #fff;
        }
        .article-tags .share {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-soft);
            font-size: 14px;
        }
        .article-tags .share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--border-light);
            color: var(--text-light);
            font-size: 16px;
            transition: var(--transition);
            text-decoration: none;
        }
        .article-tags .share a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        .not-found-box i {
            font-size: 56px;
            color: var(--text-soft);
            margin-bottom: 20px;
            display: block;
        }
        .not-found-box h2 {
            font-size: 28px;
            color: var(--text);
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-light);
            margin-bottom: 24px;
            font-size: 16px;
        }
        .not-found-box .btn {
            display: inline-block;
            padding: 12px 36px;
            border-radius: 40px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
        }
        .not-found-box .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            padding: 64px 0;
            background: var(--bg-section);
        }
        .related-section .section-title {
            text-align: center;
            margin-bottom: 40px;
        }
        .related-section .section-title h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 8px;
        }
        .related-section .section-title p {
            color: var(--text-light);
            font-size: 16px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow);
            border-color: var(--primary-soft);
        }
        .related-card .card-img {
            height: 180px;
            overflow: hidden;
            position: relative;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .related-card:hover .card-img img {
            transform: scale(1.05);
        }
        .related-card .card-body {
            padding: 20px 20px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .card-body .card-cat {
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }
        .related-card .card-body h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.4;
            margin-bottom: 8px;
            transition: var(--transition);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card:hover .card-body h3 {
            color: var(--primary);
        }
        .related-card .card-body p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
        }
        .related-card .card-body .card-meta {
            font-size: 13px;
            color: var(--text-soft);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .related-card .card-body .card-meta i {
            color: var(--primary-light);
            margin-right: 4px;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 64px 0;
            background: var(--bg);
        }
        .faq-section .section-title {
            text-align: center;
            margin-bottom: 40px;
        }
        .faq-section .section-title h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 8px;
        }
        .faq-section .section-title p {
            color: var(--text-light);
            font-size: 16px;
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-soft);
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-q {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            transition: var(--transition);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-item .faq-q:hover {
            color: var(--primary);
        }
        .faq-item .faq-q i {
            font-size: 14px;
            color: var(--text-soft);
            transition: var(--transition);
        }
        .faq-item.active .faq-q i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item .faq-a {
            padding: 0 24px 0;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-light);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.active .faq-a {
            padding: 0 24px 20px;
            max-height: 300px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 72px 0;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(13, 31, 35, 0.88) 0%, rgba(13, 31, 35, 0.65) 100%);
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .cta-section .btn-primary {
            padding: 14px 42px;
            border-radius: 40px;
            background: var(--accent);
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            display: inline-block;
            box-shadow: 0 4px 20px rgba(245, 166, 35, 0.3);
        }
        .cta-section .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 32px rgba(245, 166, 35, 0.4);
        }
        .cta-section .btn-outline {
            padding: 14px 42px;
            border-radius: 40px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: 16px;
            border: 2px solid rgba(255, 255, 255, 0.4);
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            display: inline-block;
        }
        .cta-section .btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-3px);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 0;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .site-footer .footer-brand .site-logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .site-footer .footer-brand .site-logo i {
            color: var(--accent);
        }
        .site-footer .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
        }
        .site-footer .footer-col h5 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .site-footer .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            text-decoration: none;
            padding: 4px 0;
            transition: var(--transition);
        }
        .site-footer .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            padding: 20px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }
        .site-footer .footer-bottom .footer-socials {
            display: flex;
            gap: 12px;
        }
        .site-footer .footer-bottom .footer-socials a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.5);
            font-size: 16px;
            transition: var(--transition);
            text-decoration: none;
        }
        .site-footer .footer-bottom .footer-socials a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-body {
                padding: 36px 32px;
            }
            .article-hero h1 {
                font-size: 32px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-height: 64px;
            }
            .site-header {
                padding: 0 16px;
            }
            .nav-links {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.10);
                border-bottom: 1px solid var(--border-light);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                pointer-events: none;
                border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav-links a {
                padding: 12px 20px;
                font-size: 16px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav-toggle {
                display: block;
            }
            .article-hero {
                padding: 48px 0 40px;
            }
            .article-hero h1 {
                font-size: 26px;
            }
            .article-body {
                padding: 24px 20px;
                border-radius: var(--radius);
            }
            .article-body .content {
                font-size: 15px;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .cta-section .btn-group {
                flex-direction: column;
                width: 100%;
            }
            .cta-section .btn-primary,
            .cta-section .btn-outline {
                width: 100%;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-hero h1 {
                font-size: 22px;
            }
            .article-body {
                padding: 16px 14px;
            }
            .article-tags {
                flex-direction: column;
                align-items: flex-start;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .related-card .card-img {
                height: 160px;
            }
            .faq-item .faq-q {
                font-size: 14px;
                padding: 14px 16px;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: 16px;
        }
        .mt-2 {
            margin-top: 32px;
        }
        .mb-1 {
            margin-bottom: 16px;
        }
        .mb-2 {
            margin-bottom: 32px;
        }
        .gap-1 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }