/* roulang page: index */
:root {
            --bg-page: #F8FAFC;
            --bg-card: #FFFFFF;
            --brand-blue-dark: #1E40AF;
            --brand-blue: #2563EB;
            --brand-cyan: #0EA5E9;
            --brand-green: #10B981;
            --dark-section: #0F172A;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
            --radius-card: 12px;
            --radius-btn: 6px;
            --radius-pill: 9999px;
            --shadow-sm: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
            --transition-base: 300ms ease;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-page);
            color: var(--text-body);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
            position: relative;
            padding-bottom: 72px; /* 为底部常驻浮动条留出空间 */
        }

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

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部通栏辅助条 */
        .top-utility-bar {
            background-color: #F1F5F9;
            border-bottom: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-muted);
            padding: 8px 0;
        }
        .utility-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .utility-left span {
            margin-right: 20px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .utility-left .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: var(--brand-green);
            display: inline-block;
        }

        /* 导航 */
        header.sticky-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
        }
        .nav-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 76px;
        }
        .brand-logo {
            font-size: 20px;
            font-weight: 800;
            color: var(--brand-blue-dark);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .brand-logo span {
            color: var(--brand-cyan);
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 28px;
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-body);
            font-size: 15px;
            padding: 8px 0;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--brand-blue);
        }
        .btn-cta-nav {
            background-color: var(--brand-blue);
            color: #ffffff;
            font-weight: 600;
            font-size: 14px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
        }
        .btn-cta-nav:hover {
            background-color: var(--brand-blue-dark);
        }

        /* 板块通则 */
        section {
            padding: 96px 0;
            scroll-margin-top: 80px;
        }
        .section-header {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 56px;
        }
        .section-tag {
            display: inline-block;
            background-color: rgba(37, 99, 235, 0.08);
            color: var(--brand-blue);
            font-weight: 700;
            font-size: 13px;
            padding: 4px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 14px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .section-title {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-main);
            line-height: 1.3;
            margin-bottom: 18px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* 卡片公用 */
        .card-box {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition-base), box-shadow var(--transition-base);
        }
        .card-box:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        /* 板块 1: Hero (产品截图舞台居中，左右价值点与下载按钮组) */
        #hero {
            position: relative;
            padding: 80px 0 100px;
            background: linear-gradient(180deg, #F0F7FF 0%, #F8FAFC 100%);
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }
        .hero-head-content {
            text-align: center;
            max-width: 900px;
            margin: 0 auto 48px;
        }
        .hero-head-content h1 {
            font-size: 44px;
            font-weight: 900;
            color: var(--text-main);
            letter-spacing: -0.5px;
            line-height: 1.25;
            margin-bottom: 20px;
        }
        .hero-head-content p {
            font-size: 17px;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-action-group {
            display: flex;
            justify-content: center;
            gap: 16px;
        }
        .btn-primary {
            background-color: var(--brand-blue);
            color: #ffffff;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            font-size: 16px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        .btn-primary:hover {
            background-color: var(--brand-blue-dark);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: #ffffff;
            color: var(--brand-blue-dark);
            border: 1px solid var(--border-color);
            font-weight: 600;
            padding: 14px 28px;
            border-radius: var(--radius-btn);
            font-size: 16px;
        }
        .btn-outline:hover {
            border-color: var(--brand-blue);
            color: var(--brand-blue);
        }
        .hero-stage-layout {
            display: grid;
            grid-template-columns: 280px 1fr 280px;
            gap: 24px;
            align-items: center;
            margin-top: 40px;
        }
        .value-card-col {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .value-point-item {
            background: #ffffff;
            padding: 20px;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        .value-point-item h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--brand-blue-dark);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .value-point-item p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        .hero-center-stage {
            position: relative;
            background: #ffffff;
            border-radius: 16px;
            padding: 12px;
            box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.15);
            border: 1px solid var(--border-color);
        }
        .hero-stage-img-wrap {
            border-radius: 10px;
            overflow: hidden;
            position: relative;
        }
        .hero-stage-img-wrap img {
            width: 100%;
            height: 380px;
            object-fit: cover;
        }
        .stage-float-badge {
            position: absolute;
            bottom: 20px;
            left: 20px;
            right: 20px;
            background: rgba(15, 23, 42, 0.85);
            backdrop-filter: blur(8px);
            padding: 14px 20px;
            border-radius: 8px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #ffffff;
            font-size: 13px;
        }

        /* 板块 2: KPI 看板 (#metrics) */
        #metrics {
            padding: 40px 0 60px;
            background: #ffffff;
            border-bottom: 1px solid var(--border-color);
        }
        .kpi-board-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .kpi-item {
            padding: 28px 24px;
            border-left: 3px solid var(--brand-blue);
            background: var(--bg-page);
            border-radius: 0 var(--radius-card) var(--radius-card) 0;
        }
        .kpi-value {
            font-size: 40px;
            font-weight: 900;
            color: var(--brand-blue-dark);
            line-height: 1.1;
            margin-bottom: 8px;
            font-feature-settings: "tnum";
        }
        .kpi-label {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 4px;
        }
        .kpi-note {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 板块 3: 架构说明与数据链路 (#architecture) */
        #architecture {
            background-color: var(--bg-page);
        }
        .arch-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .arch-steps {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .arch-step-card {
            background: #ffffff;
            padding: 22px;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-color);
            display: flex;
            gap: 18px;
        }
        .step-num {
            width: 36px;
            height: 36px;
            background: rgba(37, 99, 235, 0.1);
            color: var(--brand-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 16px;
            flex-shrink: 0;
        }
        .step-info h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 6px;
        }
        .step-info p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.6;
        }
        .arch-visual-preview {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .arch-visual-preview img {
            width: 100%;
            height: 320px;
            object-fit: cover;
        }
        .arch-visual-text {
            padding: 24px;
        }
        .arch-visual-text h3 {
            font-size: 20px;
            color: var(--brand-blue-dark);
            margin-bottom: 10px;
        }

        /* 板块 4: 核心优势六大矩阵 (#advantages) */
        #advantages {
            background: #ffffff;
        }
        .advantage-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .adv-card {
            padding: 32px 28px;
            border-radius: var(--radius-card);
            background: linear-gradient(135deg, #ffffff 0%, #F8FAFC 100%);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition-base);
        }
        .adv-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(37, 99, 235, 0.3);
        }
        .adv-icon-badge {
            width: 48px;
            height: 48px;
            background: rgba(37, 99, 235, 0.1);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--brand-blue);
            font-weight: 800;
            font-size: 18px;
            margin-bottom: 20px;
        }
        .adv-card h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .adv-card p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* 板块 5: 服务矩阵与终端解决方案 (#solutions) */
        #solutions {
            background-color: var(--bg-page);
        }
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .sol-card {
            background: #ffffff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-sm);
        }
        .sol-img-wrap {
            height: 190px;
            overflow: hidden;
        }
        .sol-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .sol-card:hover .sol-img-wrap img {
            transform: scale(1.05);
        }
        .sol-body {
            padding: 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .sol-body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .sol-body p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.6;
            margin-bottom: 20px;
        }
        .sol-checklist {
            list-style: none;
            margin-bottom: 24px;
            flex: 1;
        }
        .sol-checklist li {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sol-checklist li::before {
            content: "✓";
            color: var(--brand-green);
            font-weight: 800;
        }
        .sol-btn {
            background: #F1F5F9;
            color: var(--brand-blue-dark);
            text-align: center;
            padding: 12px 0;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 14px;
        }
        .sol-btn:hover {
            background: var(--brand-blue);
            color: #ffffff;
        }

        /* 板块 6: 实时算法与高阶模型计算区 (#engine 深色反差) */
        #engine {
            background-color: var(--dark-section);
            color: #ffffff;
            position: relative;
        }
        #engine .section-title {
            color: #ffffff;
        }
        #engine .section-desc {
            color: #94A3B8;
        }
        .engine-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .engine-box-terminal {
            background: #1E293B;
            border-radius: var(--radius-card);
            border: 1px solid #334155;
            padding: 24px;
            font-family: monospace;
            font-size: 13px;
            color: #38BDF8;
            box-shadow: 0 20px 25px -5px rgba(0,0,0,0.5);
        }
        .terminal-header {
            display: flex;
            gap: 8px;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid #334155;
        }
        .terminal-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #EF4444;
        }
        .terminal-dot:nth-child(2) { background: #F59E0B; }
        .terminal-dot:nth-child(3) { background: #10B981; }
        .engine-info-wrap {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .engine-feature-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 8px;
            padding: 18px;
        }
        .engine-feature-card h4 {
            color: #38BDF8;
            font-size: 16px;
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .engine-feature-card p {
            color: #94A3B8;
            font-size: 13px;
            line-height: 1.6;
        }

        /* 板块 7: 结果对比 (对比我们 vs 传统) (#comparison) */
        #comparison {
            background: #ffffff;
        }
        .compare-table-wrapper {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }
        .compare-table th, .compare-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-color);
        }
        .compare-table th {
            background: #F8FAFC;
            font-weight: 700;
            color: var(--text-main);
            font-size: 15px;
        }
        .compare-table tr:last-child td {
            border-bottom: none;
        }
        .col-highlight {
            background-color: rgba(37, 99, 235, 0.03);
            color: var(--brand-blue-dark);
            font-weight: 600;
        }
        .tag-good {
            color: var(--brand-green);
            font-weight: 700;
        }
        .tag-bad {
            color: #94A3B8;
        }

        /* 板块 8: 演播与转播场景演示 (#stories) */
        #stories {
            background-color: var(--bg-page);
        }
        .stories-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .story-item {
            background: #ffffff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-color);
            padding: 32px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .story-badge {
            align-self: flex-start;
            background: #EFF6FF;
            color: var(--brand-blue);
            font-size: 12px;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 4px;
            margin-bottom: 16px;
        }
        .story-item h3 {
            font-size: 20px;
            color: var(--text-main);
            margin-bottom: 14px;
        }
        .story-item p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 24px;
        }
        .story-metric-row {
            display: flex;
            gap: 24px;
            border-top: 1px solid var(--border-color);
            padding-top: 18px;
        }
        .sm-item strong {
            display: block;
            font-size: 20px;
            color: var(--brand-blue);
            font-weight: 800;
        }
        .sm-item span {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 板块 9: 关键技术发展与里程碑 (#timeline) */
        #timeline {
            background: #ffffff;
        }
        .timeline-container {
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            padding: 20px 0;
        }
        .timeline-container::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 2px;
            background: var(--border-color);
            transform: translateX(-50%);
        }
        .timeline-node {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 40px;
            position: relative;
        }
        .timeline-node:nth-child(even) {
            flex-direction: row-reverse;
        }
        .timeline-content {
            width: 44%;
            background: var(--bg-page);
            padding: 24px;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        .timeline-content h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--brand-blue-dark);
            margin-bottom: 8px;
        }
        .timeline-content p {
            font-size: 13px;
            color: var(--text-body);
            line-height: 1.6;
        }
        .timeline-badge-center {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--brand-blue);
            border: 4px solid #ffffff;
            box-shadow: 0 0 0 2px var(--brand-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            font-size: 12px;
            font-weight: 800;
            z-index: 2;
        }

        /* 板块 10: 行业分析师与权威评价 (#testimonials) */
        #testimonials {
            background-color: var(--bg-page);
        }
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .testimonial-card {
            background: #ffffff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-color);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .testimonial-stars {
            color: #F59E0B;
            font-size: 16px;
            letter-spacing: 2px;
            margin-bottom: 16px;
        }
        .testimonial-text {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.75;
            margin-bottom: 24px;
            flex: 1;
        }
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 14px;
            border-top: 1px solid var(--border-color);
            padding-top: 18px;
        }
        .author-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(37, 99, 235, 0.1);
            color: var(--brand-blue);
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
        }
        .author-details h5 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
        }
        .author-details span {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 板块 11: 深度资讯与技术动态 (#insights) */
        #insights {
            background: #ffffff;
        }
        .insights-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .insight-card {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-card);
            overflow: hidden;
            background: #ffffff;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .insight-thumb {
            height: 180px;
            overflow: hidden;
        }
        .insight-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .insight-card:hover .insight-thumb img {
            transform: scale(1.06);
        }
        .insight-content {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .insight-meta {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 10px;
            display: flex;
            gap: 12px;
        }
        .insight-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
            line-height: 1.45;
        }
        .insight-summary {
            font-size: 13px;
            color: var(--text-body);
            line-height: 1.6;
            margin-bottom: 20px;
            flex: 1;
        }
        .insight-link {
            font-size: 13px;
            font-weight: 700;
            color: var(--brand-blue);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        /* 板块 12: 异议拆解与快速解答 (#faq) */
        #faq {
            background-color: var(--bg-page);
        }
        .faq-wrapper {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .faq-item summary {
            padding: 22px 28px;
            font-weight: 700;
            font-size: 16px;
            color: var(--text-main);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: "+";
            font-size: 20px;
            font-weight: 400;
            color: var(--text-muted);
            transition: transform var(--transition-base);
        }
        .faq-item[open] summary::after {
            transform: rotate(45deg);
            color: var(--brand-blue);
        }
        .faq-item p {
            padding: 0 28px 24px;
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
            border-top: 1px solid #F1F5F9;
            margin-top: 4px;
            padding-top: 18px;
        }

        /* 板块 13: 平台技术保障与服务承诺 (#guarantee) */
        #guarantee {
            background: #ffffff;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .guarantee-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .guarantee-item {
            text-align: center;
            padding: 32px 20px;
            border-radius: var(--radius-card);
            background: var(--bg-page);
            border: 1px solid var(--border-color);
        }
        .guarantee-icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 18px;
            background: rgba(37, 99, 235, 0.1);
            color: var(--brand-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 800;
        }
        .guarantee-item h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .guarantee-item p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 板块 14: 底部落地页终极转化表单区 (#contact) */
        #contact {
            background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
            padding: 96px 0;
        }
        .contact-box {
            background: #ffffff;
            border-radius: 16px;
            border: 1px solid rgba(37, 99, 235, 0.2);
            box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.08);
            display: grid;
            grid-template-columns: 1fr 1fr;
            overflow: hidden;
        }
        .contact-intro {
            padding: 56px 48px;
            background: linear-gradient(180deg, #1E40AF 0%, #0F172A 100%);
            color: #ffffff;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .contact-intro h2 {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 18px;
        }
        .contact-intro p {
            font-size: 15px;
            color: #CBD5E1;
            line-height: 1.7;
            margin-bottom: 32px;
        }
        .contact-perks {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .contact-perks li {
            font-size: 14px;
            color: #E2E8F0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .contact-perks li::before {
            content: "✓";
            color: var(--brand-green);
            font-weight: 900;
        }
        .contact-form-area {
            padding: 56px 48px;
            background: #ffffff;
        }
        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .form-group-full {
            grid-column: span 2;
        }
        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-btn);
            font-size: 14px;
            color: var(--text-main);
            background: #F8FAFC;
            transition: var(--transition-base);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--brand-blue);
            background: #ffffff;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
        }
        .form-submit-btn {
            width: 100%;
            background-color: var(--brand-blue);
            color: #ffffff;
            font-size: 16px;
            font-weight: 700;
            padding: 14px;
            border: none;
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: var(--transition-base);
            margin-top: 12px;
        }
        .form-submit-btn:hover {
            background-color: var(--brand-blue-dark);
        }

        /* 底部常驻悬浮条 */
        .bottom-sticky-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 72px;
            background: rgba(15, 23, 42, 0.96);
            backdrop-filter: blur(10px);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            z-index: 999;
            display: flex;
            align-items: center;
        }
        .sticky-bar-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        .sticky-bar-text {
            color: #ffffff;
            font-size: 15px;
            font-weight: 600;
        }
        .sticky-bar-text span {
            color: var(--brand-cyan);
            margin-right: 12px;
        }
        .sticky-bar-btn {
            background-color: var(--brand-blue);
            color: #ffffff;
            font-size: 14px;
            font-weight: 700;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
        }
        .sticky-bar-btn:hover {
            background-color: #3B82F6;
        }

        /* 页脚 */
        footer.site-footer {
            background-color: var(--dark-section);
            color: #94A3B8;
            padding: 80px 0 32px;
            font-size: 13px;
            border-top: 1px solid #1E293B;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 56px;
        }
        .footer-brand h4 {
            font-size: 18px;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 16px;
        }
        .footer-brand p {
            line-height: 1.7;
            margin-bottom: 20px;
            max-width: 360px;
        }
        .footer-col h5 {
            font-size: 15px;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 18px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul a:hover {
            color: #38BDF8;
        }
        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 32px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
        }
        .footer-links-inline {
            display: flex;
            gap: 20px;
        }

        /* 响应式样式 */
        @media (max-width: 1024px) {
            .hero-stage-layout {
                grid-template-columns: 1fr;
            }
            .hero-stage-img-wrap img {
                height: 280px;
            }
            .value-card-col {
                display: grid;
                grid-template-columns: 1fr 1fr;
            }
            .kpi-board-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .advantage-grid, .solutions-grid, .testimonials-grid, .insights-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .arch-grid, .engine-grid, .stories-grid, .contact-box {
                grid-template-columns: 1fr;
            }
            .guarantee-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            body {
                padding-bottom: 0;
            }
            .top-utility-bar {
                display: none;
            }
            .nav-menu {
                display: none;
            }
            section {
                padding: 56px 0;
            }
            .hero-head-content h1 {
                font-size: 30px;
            }
            .hero-head-content p {
                font-size: 15px;
            }
            .hero-action-group {
                flex-direction: column;
            }
            .value-card-col {
                grid-template-columns: 1fr;
            }
            .kpi-board-grid {
                grid-template-columns: 1fr;
            }
            .advantage-grid, .solutions-grid, .testimonials-grid, .insights-grid, .guarantee-grid {
                grid-template-columns: 1fr;
            }
            .timeline-container::before {
                left: 20px;
            }
            .timeline-node {
                flex-direction: column !important;
                align-items: flex-start;
                padding-left: 48px;
            }
            .timeline-content {
                width: 100%;
            }
            .timeline-badge-center {
                left: 20px;
            }
            .compare-table-wrapper {
                overflow-x: auto;
            }
            .contact-intro, .contact-form-area {
                padding: 32px 24px;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group-full {
                grid-column: span 1;
            }
            .bottom-sticky-bar {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 16px;
                text-align: center;
            }
        }