/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0a66c2;
            --primary-dark: #084a8a;
            --primary-light: #e8f0fe;
            --primary-gradient: linear-gradient(135deg, #0a66c2 0%, #1a8cff 100%);
            --secondary: #00bcd4;
            --secondary-dark: #0097a7;
            --accent: #ff6d00;
            --bg-dark: #0b0f1a;
            --bg-darker: #070a12;
            --bg-card: #111827;
            --bg-surface: #1a2236;
            --bg-light: #f8fafc;
            --text-white: #f1f5f9;
            --text-light: #94a3b8;
            --text-muted: #64748b;
            --text-dark: #0f172a;
            --text-body: #334155;
            --border-light: #e2e8f0;
            --border-dark: #2a3a5c;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
            --shadow-md: 0 8px 32px rgba(0,0,0,0.12);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.18);
            --shadow-glow: 0 0 40px rgba(10,102,194,0.15);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 基础 Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-light);
            overflow-x: hidden;
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        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 { line-height: 1.25; color: var(--text-dark); font-weight: 700; }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 浮动 Dock 导航 ===== */
        .site-header {
            position: fixed;
            top: 20px;
            left: 0;
            right: 0;
            z-index: 1000;
            pointer-events: none;
        }
        .nav-dock {
            max-width: 820px;
            margin: 0 auto;
            padding: 0 16px;
            pointer-events: auto;
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: rgba(11, 15, 26, 0.88);
            backdrop-filter: blur(20px) saturate(1.4);
            -webkit-backdrop-filter: blur(20px) saturate(1.4);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: 60px;
            padding: 8px 24px 8px 20px;
            box-shadow: 0 8px 40px rgba(0,0,0,0.35);
            transition: box-shadow var(--transition);
        }
        .nav-inner:hover {
            box-shadow: 0 12px 56px rgba(0,0,0,0.45), var(--shadow-glow);
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-white);
            font-weight: 700;
            font-size: 18px;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .nav-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary-gradient);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: #fff;
            flex-shrink: 0;
        }
        .nav-logo:hover { color: var(--text-white); opacity: 0.9; }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: 40px;
            color: var(--text-light);
            font-size: 14px;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            color: var(--text-white);
            background: rgba(255,255,255,0.06);
        }
        .nav-links a.active {
            color: #fff;
            background: var(--primary-gradient);
            box-shadow: 0 4px 16px rgba(10,102,194,0.30);
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .nav-cta .btn-nav {
            padding: 8px 22px;
            border-radius: 40px;
            background: var(--primary-gradient);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(10,102,194,0.25);
        }
        .nav-cta .btn-nav:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(10,102,194,0.35);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 26px;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .mobile-toggle:hover { background: rgba(255,255,255,0.08); }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-dark);
            overflow: hidden;
            padding: 140px 0 80px;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.30;
            z-index: 1;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(10,102,194,0.25) 0%, transparent 70%),
                        radial-gradient(ellipse at 70% 60%, rgba(0,188,212,0.10) 0%, transparent 50%),
                        linear-gradient(180deg, rgba(11,15,26,0.92) 0%, rgba(11,15,26,0.70) 50%, rgba(11,15,26,0.95) 100%);
            z-index: 2;
        }
        .hero-content {
            position: relative;
            z-index: 3;
            text-align: center;
            max-width: 820px;
            padding: 0 24px;
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 20px;
            border-radius: 40px;
            background: rgba(10,102,194,0.18);
            border: 1px solid rgba(10,102,194,0.25);
            color: var(--secondary);
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.8px;
            text-transform: uppercase;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            font-size: clamp(2.6rem, 6vw, 4.2rem);
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero h1 .highlight {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: clamp(1.05rem, 2vw, 1.25rem);
            color: var(--text-light);
            max-width: 680px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 50px;
            background: var(--primary-gradient);
            color: #fff;
            font-weight: 600;
            font-size: 16px;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            box-shadow: 0 8px 32px rgba(10,102,194,0.30);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 48px rgba(10,102,194,0.40);
            color: #fff;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 50px;
            background: rgba(255,255,255,0.06);
            color: var(--text-white);
            font-weight: 600;
            font-size: 16px;
            border: 1px solid rgba(255,255,255,0.12);
            cursor: pointer;
            transition: all var(--transition);
        }
        .btn-secondary:hover {
            background: rgba(255,255,255,0.12);
            border-color: rgba(255,255,255,0.20);
            color: #fff;
            transform: translateY(-3px);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 40px;
            margin-top: 56px;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.5px;
        }
        .hero-stat .num span { color: var(--secondary); }
        .hero-stat .label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 100px 0;
        }
        .section-alt {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-alt .section-title,
        .section-alt .section-subtitle { color: var(--text-white); }
        .section-alt .section-subtitle { color: var(--text-light); }
        .section-title {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 800;
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-muted);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
            line-height: 1.8;
        }
        .section-title-left {
            text-align: left;
        }
        .section-subtitle-left {
            text-align: left;
            margin-left: 0;
        }

        /* ===== 卡片 ===== */
        .card {
            background: #fff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 32px 28px;
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .card-dark {
            background: var(--bg-card);
            border-color: var(--border-dark);
            color: var(--text-light);
        }
        .card-dark:hover {
            border-color: rgba(10,102,194,0.25);
            box-shadow: 0 12px 48px rgba(0,0,0,0.30);
        }
        .card-dark .card-title { color: var(--text-white); }
        .card-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-dark);
        }
        .card-text {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--primary);
            margin-bottom: 18px;
        }
        .card-dark .card-icon {
            background: rgba(10,102,194,0.15);
            color: var(--secondary);
        }

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

        /* ===== 按钮通用 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 15px;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
        }
        .btn-outline {
            background: transparent;
            border: 1.5px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }
        .btn-light {
            background: rgba(255,255,255,0.08);
            color: var(--text-white);
            border: 1px solid rgba(255,255,255,0.10);
        }
        .btn-light:hover {
            background: rgba(255,255,255,0.16);
            color: #fff;
        }

        /* ===== 标签/徽章 ===== */
        .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 12px;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
            letter-spacing: 0.3px;
        }
        .tag-dark {
            background: rgba(10,102,194,0.15);
            color: var(--secondary);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 2px 12px;
            border-radius: 40px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(0,188,212,0.12);
            color: var(--secondary);
        }

        /* ===== 内容列表（CMS） ===== */
        .post-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .post-card {
            background: #fff;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .post-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .post-card .post-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--border-light);
        }
        .post-card .post-body {
            padding: 22px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .post-card .post-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .post-card .post-title a {
            color: inherit;
        }
        .post-card .post-title a:hover {
            color: var(--primary);
        }
        .post-card .post-excerpt {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.7;
            flex: 1;
        }
        .post-card .post-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 16px;
            padding-top: 14px;
            border-top: 1px solid var(--border-light);
        }
        .post-card .post-cat {
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(10,102,194,0.15);
            box-shadow: var(--shadow-sm);
        }
        .faq-item summary {
            padding: 20px 28px;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            list-style: none;
            transition: color var(--transition);
        }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after {
            content: '+';
            font-size: 22px;
            font-weight: 300;
            color: var(--primary);
            transition: transform 0.3s ease;
        }
        .faq-item[open] summary::after {
            transform: rotate(45deg);
        }
        .faq-item[open] summary {
            color: var(--primary);
        }
        .faq-item .faq-answer {
            padding: 0 28px 22px;
            color: var(--text-muted);
            line-height: 1.8;
            font-size: 0.95rem;
        }
        .faq-dark .faq-item {
            background: var(--bg-card);
            border-color: var(--border-dark);
        }
        .faq-dark .faq-item summary {
            color: var(--text-white);
        }
        .faq-dark .faq-item[open] summary {
            color: var(--secondary);
        }
        .faq-dark .faq-item .faq-answer {
            color: var(--text-light);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section .cta-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            z-index: 1;
        }
        .cta-inner {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 80px 24px;
        }
        .cta-inner h2 {
            font-size: clamp(2rem, 4vw, 2.8rem);
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-inner p {
            font-size: 1.1rem;
            color: var(--text-light);
            max-width: 560px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ===== 路径图/流程 ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-dark);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            border-color: rgba(10,102,194,0.25);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0,0,0,0.20);
        }
        .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 1.2rem;
            margin: 0 auto 16px;
            box-shadow: 0 4px 20px rgba(10,102,194,0.25);
        }
        .step-card h4 {
            color: var(--text-white);
            font-size: 1.1rem;
            margin-bottom: 8px;
        }
        .step-card p {
            color: var(--text-light);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        /* ===== 对比面板 ===== */
        .compare-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .compare-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-dark);
            padding: 36px 32px;
            transition: all var(--transition);
        }
        .compare-card:hover {
            border-color: rgba(10,102,194,0.20);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0,0,0,0.15);
        }
        .compare-card.featured {
            border-color: rgba(10,102,194,0.30);
            background: linear-gradient(145deg, #141e33, #0f1729);
        }
        .compare-card h4 {
            color: var(--text-white);
            font-size: 1.3rem;
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .compare-card ul {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 2;
        }
        .compare-card ul li::before {
            content: '✓ ';
            color: var(--secondary);
            font-weight: 700;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-darker);
            color: var(--text-light);
            padding: 56px 0 32px;
            border-top: 1px solid rgba(255,255,255,0.04);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo-text {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            max-width: 300px;
            line-height: 1.8;
        }
        .footer-col h5 {
            color: var(--text-white);
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--secondary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.04);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: 1fr 1fr; }
            .steps { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 820px) {
            .nav-links { display: none; }
            .nav-cta .btn-nav { display: none; }
            .mobile-toggle { display: block; }
            .nav-links.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: calc(100% + 12px);
                left: 16px;
                right: 16px;
                background: rgba(11,15,26,0.96);
                backdrop-filter: blur(20px);
                border-radius: var(--radius-md);
                border: 1px solid rgba(255,255,255,0.08);
                padding: 16px;
                gap: 6px;
                box-shadow: 0 20px 60px rgba(0,0,0,0.50);
            }
            .nav-links.open a {
                padding: 12px 18px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav-cta .btn-nav.mobile-show {
                display: inline-flex;
                margin-top: 8px;
                width: 100%;
                justify-content: center;
            }
            .grid-2, .grid-3, .post-list { grid-template-columns: 1fr; }
            .compare-grid { grid-template-columns: 1fr; }
            .hero h1 { font-size: 2.4rem; }
            .hero-stats { gap: 24px; }
            .hero-stat .num { font-size: 1.6rem; }
            .section { padding: 64px 0; }
            .steps { grid-template-columns: 1fr 1fr; gap: 16px; }
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
        }
        @media (max-width: 520px) {
            .site-header { top: 12px; }
            .nav-inner { padding: 6px 12px 6px 16px; }
            .nav-logo { font-size: 15px; }
            .nav-logo .logo-icon { width: 28px; height: 28px; font-size: 13px; }
            .hero { padding: 120px 0 60px; }
            .hero h1 { font-size: 1.9rem; }
            .hero p { font-size: 1rem; }
            .hero-actions { flex-direction: column; width: 100%; }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary { width: 100%; justify-content: center; }
            .hero-stats { flex-direction: column; gap: 16px; }
            .section-title { font-size: 1.7rem; }
            .steps { grid-template-columns: 1fr; }
            .grid-4 { grid-template-columns: 1fr; }
            .post-card .post-img { height: 160px; }
            .cta-inner { padding: 48px 16px; }
            .cta-actions { flex-direction: column; width: 100%; }
            .cta-actions .btn-primary,
            .cta-actions .btn-secondary { width: 100%; justify-content: center; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== 工具类 ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .mt-48 { margin-top: 48px; }
        .mb-16 { margin-bottom: 16px; }
        .gap-12 { gap: 12px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .relative { position: relative; }

        /* ===== 动画 ===== */
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(24px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-fade-up {
            animation: fadeUp 0.6s ease forwards;
        }
        .animate-delay-1 { animation-delay: 0.1s; }
        .animate-delay-2 { animation-delay: 0.2s; }
        .animate-delay-3 { animation-delay: 0.3s; }
        .animate-delay-4 { animation-delay: 0.4s; }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --secondary: #f59e0b;
            --secondary-hover: #d97706;
            --accent: #06b6d4;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-dock: rgba(15, 23, 42, 0.92);
            --text-primary: #0f172a;
            --text-secondary: #334155;
            --text-muted: #94a3b8;
            --text-light: #f1f5f9;
            --text-white: #ffffff;
            --border-color: #e2e8f0;
            --border-light: rgba(255, 255, 255, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
            --shadow-dock: 0 8px 32px rgba(0, 0, 0, 0.25);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --section-gap: 80px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
            transition: var(--transition);
        }

        input,
        textarea {
            font-family: inherit;
            transition: var(--transition);
        }

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

        .section {
            padding: var(--section-gap) 0;
        }

        .section-title {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.7;
        }

        .text-center {
            text-align: center;
        }

        .mx-auto {
            margin-left: auto;
            margin-right: auto;
        }

        .mb-16 {
            margin-bottom: 16px;
        }

        .mb-24 {
            margin-bottom: 24px;
        }

        .mb-32 {
            margin-bottom: 32px;
        }

        .mb-48 {
            margin-bottom: 48px;
        }

        .mt-16 {
            margin-top: 16px;
        }

        .mt-24 {
            margin-top: 24px;
        }

        .mt-32 {
            margin-top: 32px;
        }

        .gap-16 {
            gap: 16px;
        }

        .gap-24 {
            gap: 24px;
        }

        .flex {
            display: flex;
        }

        .flex-wrap {
            flex-wrap: wrap;
        }

        .items-center {
            align-items: center;
        }

        .justify-center {
            justify-content: center;
        }

        .justify-between {
            justify-content: space-between;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 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;
        }

        /* ===== Header / Dock Nav ===== */
        .site-header {
            position: fixed;
            top: 20px;
            left: 0;
            right: 0;
            z-index: 1000;
            display: flex;
            justify-content: center;
            pointer-events: none;
        }

        .nav-dock {
            background: var(--bg-dock);
            backdrop-filter: blur(20px) saturate(1.4);
            -webkit-backdrop-filter: blur(20px) saturate(1.4);
            border-radius: var(--radius-xl);
            padding: 8px 24px;
            box-shadow: var(--shadow-dock);
            border: 1px solid var(--border-light);
            pointer-events: auto;
            width: auto;
            min-width: 680px;
            max-width: 95vw;
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-hover));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #0f172a;
            font-size: 1rem;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .nav-links a {
            padding: 6px 16px;
            border-radius: var(--radius-lg);
            font-size: 0.9rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.1);
        }

        .nav-links a.active {
            background: rgba(245, 158, 11, 0.2);
            color: var(--secondary);
        }

        .nav-cta {
            display: flex;
            align-items: center;
        }

        .btn-nav {
            padding: 8px 24px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-hover));
            color: #0f172a;
            font-weight: 700;
            font-size: 0.9rem;
            border-radius: var(--radius-lg);
            transition: var(--transition);
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
            white-space: nowrap;
        }

        .btn-nav:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.45);
        }

        .btn-nav:active {
            transform: translateY(0);
        }

        .mobile-toggle {
            display: none;
            color: var(--text-white);
            font-size: 1.4rem;
            padding: 4px 8px;
            background: transparent;
            border: none;
        }

        .mobile-show {
            display: none !important;
        }

        /* ===== Article Hero ===== */
        .article-hero {
            padding: 140px 0 60px;
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }

        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.2;
            mix-blend-mode: overlay;
        }

        .article-hero .container {
            position: relative;
            z-index: 2;
        }

        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
            max-width: 860px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 32px;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.95rem;
        }

        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta .meta-item i {
            color: var(--secondary);
            font-size: 0.85rem;
        }

        .article-meta .category-badge {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(245, 158, 11, 0.2);
            color: var(--secondary);
            border-radius: var(--radius-lg);
            font-size: 0.85rem;
            font-weight: 600;
            border: 1px solid rgba(245, 158, 11, 0.3);
        }

        /* ===== Article Content ===== */
        .article-content-section {
            padding: 60px 0 80px;
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }

        .article-main {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 48px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }

        .article-main .content-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-secondary);
        }

        .article-main .content-body h2,
        .article-main .content-body h3 {
            color: var(--text-primary);
            margin-top: 32px;
            margin-bottom: 16px;
            font-weight: 700;
        }

        .article-main .content-body h2 {
            font-size: 1.6rem;
        }

        .article-main .content-body h3 {
            font-size: 1.3rem;
        }

        .article-main .content-body p {
            margin-bottom: 20px;
        }

        .article-main .content-body ul,
        .article-main .content-body ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }

        .article-main .content-body li {
            margin-bottom: 8px;
        }

        .article-main .content-body img {
            margin: 24px 0;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
        }

        .article-main .content-body blockquote {
            border-left: 4px solid var(--secondary);
            padding: 16px 24px;
            background: rgba(245, 158, 11, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 24px 0;
            font-style: italic;
            color: var(--text-secondary);
        }

        .article-main .content-body a {
            color: var(--accent);
            border-bottom: 1px solid transparent;
        }

        .article-main .content-body a:hover {
            border-bottom-color: var(--accent);
        }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
            position: sticky;
            top: 120px;
        }

        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }

        .sidebar-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--secondary);
        }

        .sidebar-card ul {
            list-style: none;
            padding: 0;
        }

        .sidebar-card ul li {
            padding: 8px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .sidebar-card ul li:last-child {
            border-bottom: none;
        }

        .sidebar-card ul li a {
            color: var(--text-secondary);
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sidebar-card ul li a:hover {
            color: var(--secondary);
        }

        .sidebar-card ul li a i {
            font-size: 0.75rem;
            color: var(--secondary);
        }

        .sidebar-cta {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            border-color: transparent;
            text-align: center;
        }

        .sidebar-cta h4 {
            color: var(--text-white);
            border-bottom-color: rgba(245, 158, 11, 0.4);
        }

        .sidebar-cta p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }

        .btn-sidebar {
            display: inline-block;
            padding: 12px 32px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-hover));
            color: #0f172a;
            font-weight: 700;
            border-radius: var(--radius-lg);
            font-size: 0.95rem;
            box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
            transition: var(--transition);
        }

        .btn-sidebar:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245, 158, 11, 0.4);
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 40px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }

        .not-found-box .icon-big {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        .not-found-box h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .not-found-box p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .btn-back {
            display: inline-block;
            padding: 12px 32px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: var(--radius-lg);
            font-weight: 600;
            transition: var(--transition);
        }

        .btn-back:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ===== Related / CTA Section ===== */
        .related-section {
            background: var(--bg-body);
            padding: 60px 0;
            border-top: 1px solid var(--border-color);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 32px;
        }

        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }

        .related-card .card-body {
            padding: 20px;
        }

        .related-card .card-body h5 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .related-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== Article CTA ===== */
        .article-cta-section {
            padding: 80px 0;
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }

        .article-cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }

        .article-cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .article-cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }

        .article-cta-section p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 32px;
        }

        .btn-cta-large {
            display: inline-block;
            padding: 16px 48px;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-hover));
            color: #0f172a;
            font-weight: 700;
            font-size: 1.1rem;
            border-radius: var(--radius-xl);
            box-shadow: 0 8px 30px rgba(245, 158, 11, 0.35);
            transition: var(--transition);
        }

        .btn-cta-large:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(245, 158, 11, 0.45);
        }

        /* ===== Footer (reuse from index) ===== */
        .site-footer {
            background: #0b1120;
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand .logo-text {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-brand p {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h5 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 18px;
            letter-spacing: -0.2px;
        }

        .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(--secondary);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-bottom a:hover {
            color: var(--secondary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .section-title {
                font-size: 2rem;
            }
            .article-hero h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
            }

            .site-header {
                top: 12px;
                padding: 0 12px;
            }

            .nav-dock {
                min-width: unset;
                width: 100%;
                padding: 6px 16px;
                border-radius: var(--radius-lg);
            }

            .nav-links {
                display: none;
                position: absolute;
                top: calc(100% + 12px);
                left: 0;
                right: 0;
                background: var(--bg-dock);
                backdrop-filter: blur(20px);
                border-radius: var(--radius-lg);
                padding: 16px;
                flex-direction: column;
                gap: 4px;
                box-shadow: var(--shadow-dock);
                border: 1px solid var(--border-light);
            }

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

            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }

            .mobile-toggle {
                display: block;
            }

            .nav-cta {
                display: none;
            }

            .mobile-show {
                display: flex !important;
            }

            .mobile-show .btn-nav {
                width: 100%;
                text-align: center;
                margin-top: 8px;
            }

            .nav-inner {
                position: relative;
            }

            .article-hero {
                padding: 120px 0 40px;
                min-height: 240px;
            }

            .article-hero h1 {
                font-size: 1.6rem;
            }

            .article-meta {
                font-size: 0.85rem;
                gap: 12px 20px;
            }

            .article-main {
                padding: 24px 20px;
            }

            .article-main .content-body {
                font-size: 1rem;
            }

            .article-sidebar {
                grid-template-columns: 1fr;
            }

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

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

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

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

            .article-cta-section h2 {
                font-size: 1.6rem;
            }

            .btn-cta-large {
                padding: 14px 32px;
                font-size: 1rem;
            }
        }

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

            .article-hero h1 {
                font-size: 1.3rem;
            }

            .article-main {
                padding: 16px;
            }

            .article-main .content-body h2 {
                font-size: 1.3rem;
            }

            .article-main .content-body h3 {
                font-size: 1.1rem;
            }

            .not-found-box {
                padding: 40px 20px;
            }

            .nav-logo {
                font-size: 1rem;
            }

            .nav-logo .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 0.85rem;
            }
        }

        /* ===== Print ===== */
        @media print {
            .site-header {
                position: relative;
                top: 0;
                background: #0f172a;
                padding: 16px 0;
            }
            .nav-dock {
                box-shadow: none;
                border: none;
                background: transparent;
            }
            .article-sidebar {
                display: none;
            }
            .article-cta-section {
                display: none;
            }
            .site-footer {
                break-inside: avoid;
            }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --secondary: #38bdf8;
            --secondary-dark: #0284c7;
            --accent: #f59e0b;
            --bg-dark: #0b0f1a;
            --bg-card: #111827;
            --bg-section: #0f172a;
            --text-light: #f1f5f9;
            --text-muted: #94a3b8;
            --text-body: #cbd5e1;
            --border-color: #1e293b;
            --border-light: #334155;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.6);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --nav-height: 72px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-dark);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--nav-height);
        }

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

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

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

        ul,
        ol {
            list-style: none;
        }

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

        /* ===== 导航 Dock ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            padding: 12px 24px;
            background: transparent;
            pointer-events: none;
        }

        .nav-dock {
            max-width: 960px;
            margin: 0 auto;
            background: rgba(15, 23, 42, 0.82);
            backdrop-filter: blur(18px) saturate(1.3);
            -webkit-backdrop-filter: blur(18px) saturate(1.3);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: 0 20px;
            box-shadow: var(--shadow-md);
            pointer-events: all;
            transition: background var(--transition), border-color var(--transition);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
            gap: 12px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-light);
            letter-spacing: 0.5px;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .nav-logo .logo-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--secondary);
            border-radius: 50%;
            color: var(--primary);
            font-size: 18px;
        }
        .nav-logo:hover {
            color: var(--text-light);
            opacity: 0.9;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .nav-links a {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-muted);
            font-size: 14px;
            font-weight: 500;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .nav-links a:hover {
            background: rgba(56, 189, 248, 0.1);
            color: var(--text-light);
        }
        .nav-links a.active {
            background: rgba(56, 189, 248, 0.18);
            color: var(--secondary);
        }
        .nav-links a.active:hover {
            background: rgba(56, 189, 248, 0.25);
            color: var(--secondary);
        }

        .nav-cta {
            flex-shrink: 0;
        }
        .btn-nav {
            background: var(--secondary);
            color: var(--primary);
            border: none;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
        }
        .btn-nav:hover {
            background: var(--secondary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(56, 189, 248, 0.3);
        }
        .btn-nav:active {
            transform: translateY(0);
        }
        .btn-nav:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 4px;
        }

        .mobile-toggle {
            display: none;
            background: transparent;
            border: 1px solid var(--border-light);
            color: var(--text-light);
            font-size: 22px;
            padding: 8px 14px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: background var(--transition);
        }
        .mobile-toggle:hover {
            background: rgba(56, 189, 248, 0.1);
        }
        .mobile-toggle:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 4px;
        }

        .mobile-show {
            display: none !important;
        }

        /* 导航移动端响应 */
        @media (max-width: 820px) {
            .site-header {
                padding: 8px 12px;
            }
            .nav-dock {
                padding: 0 14px;
                border-radius: var(--radius-lg);
            }
            .nav-links {
                display: none;
                position: absolute;
                top: calc(var(--nav-height) + 8px);
                left: 12px;
                right: 12px;
                background: rgba(15, 23, 42, 0.96);
                backdrop-filter: blur(18px);
                border: 1px solid var(--border-light);
                border-radius: var(--radius-md);
                padding: 16px 12px;
                flex-direction: column;
                gap: 4px;
                box-shadow: var(--shadow-xl);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
            }
            .nav-cta.desktop-show {
                display: none;
            }
            .mobile-toggle {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .mobile-show {
                display: flex !important;
            }
            .nav-cta.mobile-show {
                display: flex !important;
                margin-top: 8px;
            }
            .nav-cta.mobile-show .btn-nav {
                width: 100%;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            .nav-logo {
                font-size: 16px;
                gap: 6px;
            }
            .nav-logo .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
            .nav-dock {
                padding: 0 10px;
            }
            .nav-inner {
                gap: 6px;
            }
        }

        /* ===== Hero 区块 ===== */
        .hero-section {
            position: relative;
            min-height: 80vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            background-repeat: no-repeat;
            padding: 80px 24px 100px;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 15, 26, 0.88) 30%, rgba(11, 15, 26, 0.6) 70%, rgba(11, 15, 26, 0.3) 100%);
            z-index: 1;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 160px;
            background: linear-gradient(to top, var(--bg-dark), transparent);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 880px;
            margin: 0 auto;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(56, 189, 248, 0.15);
            border: 1px solid rgba(56, 189, 248, 0.3);
            color: var(--secondary);
            padding: 6px 20px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 0.5px;
            margin-bottom: 28px;
            backdrop-filter: blur(4px);
        }
        .hero-title {
            font-size: clamp(2.6rem, 7vw, 4.8rem);
            font-weight: 800;
            line-height: 1.1;
            color: var(--text-light);
            margin-bottom: 24px;
            letter-spacing: -1px;
        }
        .hero-title span {
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-sub {
            font-size: clamp(1.05rem, 2vw, 1.3rem);
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn-primary {
            background: var(--secondary);
            color: var(--primary);
            border: none;
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 16px;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 24px rgba(56, 189, 248, 0.25);
        }
        .btn-primary:hover {
            background: var(--secondary-dark);
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(56, 189, 248, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 4px;
        }
        .btn-outline {
            background: transparent;
            color: var(--text-light);
            border: 1px solid var(--border-light);
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            transition: background var(--transition), border-color var(--transition), transform var(--transition);
        }
        .btn-outline:hover {
            background: rgba(56, 189, 248, 0.08);
            border-color: var(--secondary);
            transform: translateY(-3px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-outline:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 4px;
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 100px 0;
        }
        .section-dark {
            background: var(--bg-section);
        }
        .section-card-bg {
            background: var(--bg-card);
        }
        .section-header {
            text-align: center;
            margin-bottom: 64px;
        }
        .section-header h2 {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .section-header p {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.8;
        }
        .section-header .badge-tag {
            display: inline-block;
            background: rgba(56, 189, 248, 0.12);
            color: var(--secondary);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            margin-bottom: 12px;
            border: 1px solid rgba(56, 189, 248, 0.15);
        }

        /* ===== 核心卖点卡片 ===== */
        .grid-3,
        .grid-4 {
            display: grid;
            gap: 28px;
        }
        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 26px;
            transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--secondary), var(--accent));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .feature-card:hover {
            border-color: var(--border-light);
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            width: 52px;
            height: 52px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(56, 189, 248, 0.1);
            border-radius: var(--radius-sm);
            font-size: 24px;
            color: var(--secondary);
            margin-bottom: 20px;
            transition: background var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: rgba(56, 189, 248, 0.18);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== 适用场景 ===== */
        .scene-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .scene-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: border-color var(--transition), transform var(--transition);
        }
        .scene-item:hover {
            border-color: var(--border-light);
            transform: translateY(-4px);
        }
        .scene-icon {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(56, 189, 248, 0.1);
            border-radius: var(--radius-sm);
            font-size: 22px;
            color: var(--secondary);
        }
        .scene-text h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 6px;
        }
        .scene-text p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .steps-grid::after {
            content: '';
            position: absolute;
            top: 44px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: linear-gradient(90deg, var(--secondary), var(--border-light), var(--secondary));
            opacity: 0.3;
            z-index: 0;
        }
        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 20px 24px;
            text-align: center;
            position: relative;
            z-index: 1;
            transition: border-color var(--transition), transform var(--transition);
        }
        .step-card:hover {
            border-color: var(--border-light);
            transform: translateY(-4px);
        }
        .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--secondary);
            color: var(--primary);
            font-weight: 800;
            font-size: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            box-shadow: 0 0 30px rgba(56, 189, 248, 0.2);
        }
        .step-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== 数据/社会认同 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            text-align: center;
        }
        .stat-item {
            padding: 20px 12px;
        }
        .stat-number {
            font-size: clamp(2.2rem, 4vw, 3.2rem);
            font-weight: 800;
            color: var(--text-light);
            letter-spacing: -1px;
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .stat-label {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-top: 6px;
        }

        /* ===== 图文区块 ===== */
        .split-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .split-block.reverse {
            direction: rtl;
        }
        .split-block.reverse>* {
            direction: ltr;
        }
        .split-text h2 {
            font-size: clamp(1.8rem, 3vw, 2.4rem);
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 18px;
            letter-spacing: -0.5px;
        }
        .split-text p {
            font-size: 1rem;
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .split-text .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }
        .split-text .tag-list span {
            background: rgba(56, 189, 248, 0.08);
            border: 1px solid rgba(56, 189, 248, 0.15);
            color: var(--secondary);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
        }
        .split-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-xl);
            border: 1px solid var(--border-color);
        }
        .split-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 320px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-light);
        }
        .faq-question {
            width: 100%;
            background: transparent;
            border: none;
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-light);
            cursor: pointer;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: rgba(56, 189, 248, 0.04);
        }
        .faq-question:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: -2px;
        }
        .faq-question i {
            font-size: 18px;
            color: var(--secondary);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 24px;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 240px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-card);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .cta-box {
            text-align: center;
            padding: 60px 20px;
            max-width: 720px;
            margin: 0 auto;
        }
        .cta-box h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 16px;
        }
        .cta-box p {
            font-size: 1.05rem;
            color: var(--text-muted);
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--primary);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: var(--text-muted);
            padding: 5px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--secondary);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            padding-top: 28px;
            border-top: 1px solid var(--border-color);
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }

        /* ===== 响应式断点 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid::after {
                display: none;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
        }

        @media (max-width: 820px) {
            .section {
                padding: 70px 0;
            }
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .split-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .split-block.reverse {
                direction: ltr;
            }
            .scene-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .hero-section {
                min-height: 70vh;
                padding: 60px 20px 80px;
            }
        }

        @media (max-width: 600px) {
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .hero-title {
                font-size: 2rem;
            }
            .nav-cta.mobile-show .btn-nav {
                padding: 10px 18px;
                font-size: 14px;
            }
            .btn-primary,
            .btn-outline {
                padding: 12px 24px;
                font-size: 14px;
                width: 100%;
                text-align: center;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .cta-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .scene-item {
                flex-direction: column;
                gap: 12px;
                padding: 20px 18px;
            }
            .step-card {
                padding: 24px 16px;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px;
                font-size: 0.9rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 18px 16px;
            }
            .split-image img {
                min-height: 220px;
            }
        }

        @media (max-width: 420px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-item {
                padding: 12px 8px;
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .hero-section {
                min-height: 60vh;
                padding: 40px 16px 60px;
            }
            .hero-badge {
                font-size: 12px;
                padding: 4px 14px;
            }
        }