/* roulang page: index */
:root {
            --primary: #0F52BA;
            --primary-light: #EBF2FC;
            --primary-hover: #0B3D8A;
            --secondary: #00A896;
            --secondary-light: #E6F6F4;
            --text-dark: #1E293B;
            --text-regular: #334155;
            --text-muted: #64748B;
            --bg-page: #F8FAFC;
            --bg-card: #FFFFFF;
            --border-light: #EDF2F7;
            --radius-md: 12px;
            --radius-sm: 6px;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 82, 186, 0.06);
            --shadow-hover: 0 12px 28px -4px rgba(15, 82, 186, 0.12);
            --transition: all 0.25s ease-in-out;
            --container-max: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-page);
            color: var(--text-regular);
        }

        body {
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

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

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        .section-title {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
            position: relative;
        }

        .section-desc {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            font-weight: 600;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            min-height: 44px;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #ffffff;
            box-shadow: 0 4px 12px rgba(15, 82, 186, 0.25);
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background-color: #ffffff;
            color: var(--primary);
            border-color: var(--primary);
        }

        .btn-secondary:hover {
            background-color: var(--primary-light);
        }

        .btn-teal {
            background-color: var(--secondary);
            color: #ffffff;
        }

        .btn-teal:hover {
            background-color: #008f80;
        }

        /* 顶部通栏信息 */
        .topbar {
            background: #0f172a;
            color: #cbd5e1;
            font-size: 13px;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .topbar-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .topbar-links span {
            margin-right: 20px;
        }

        /* 导航 */
        .header-nav {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .brand-logo {
            font-size: 20px;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .brand-logo svg {
            width: 28px;
            height: 28px;
            fill: var(--primary);
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 28px;
        }
        .nav-menu a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-regular);
            transition: var(--transition);
        }
        .nav-menu a:hover, .nav-menu a.active {
            color: var(--primary);
        }

        /* 板块通用间距 */
        .section-padding {
            padding: 80px 0;
        }
        .section-alt-bg {
            background-color: #ffffff;
        }

        /* 板块 1: Hero (全宽浅色顶栏 + 矮横幅) */
        .hero-banner {
            position: relative;
            background: linear-gradient(135deg, #0F52BA 0%, #082d68 100%);
            color: #ffffff;
            padding: 60px 0;
            overflow: hidden;
        }
        .hero-banner-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .hero-grid {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 38px;
            line-height: 1.25;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .hero-content p {
            font-size: 16px;
            line-height: 1.7;
            color: #e2e8f0;
            margin-bottom: 28px;
        }
        .hero-cta-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-visual {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-md);
            padding: 20px;
            backdrop-filter: blur(4px);
        }
        .hero-visual-card {
            border-radius: var(--radius-sm);
            overflow: hidden;
        }

        /* 板块 2: KPI看板 */
        .kpi-section {
            padding: 40px 0;
            background: #ffffff;
            border-bottom: 1px solid var(--border-light);
        }
        .kpi-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .kpi-item {
            text-align: center;
            padding: 16px;
            border-right: 1px solid var(--border-light);
        }
        .kpi-item:last-child {
            border-right: none;
        }
        .kpi-num {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
            font-family: Arial, sans-serif;
        }
        .kpi-num span {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-muted);
            margin-left: 2px;
        }
        .kpi-label {
            font-size: 14px;
            color: var(--text-regular);
            font-weight: 600;
        }

        /* 板块 3: 架构概览 */
        .arch-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .arch-img-wrap {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
            border: 1px solid var(--border-light);
        }
        .arch-list {
            list-style: none;
            margin-top: 20px;
        }
        .arch-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            margin-bottom: 18px;
        }
        .arch-icon {
            width: 24px;
            height: 24px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 12px;
            flex-shrink: 0;
            margin-top: 2px;
        }

        /* 板块 4: 服务矩阵/核心优势 (6卡片) */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 30px 24px;
            box-shadow: var(--shadow-subtle);
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(15, 82, 186, 0.2);
        }
        .feature-badge {
            display: inline-block;
            background: var(--secondary-light);
            color: var(--secondary);
            font-size: 12px;
            font-weight: 600;
            padding: 2px 10px;
            border-radius: 4px;
            margin-bottom: 14px;
        }
        .feature-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }
        .feature-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 板块 5: 场景应用 (3大卡片) */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .solution-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-subtle);
            display: flex;
            flex-direction: column;
        }
        .solution-img {
            height: 200px;
            overflow: hidden;
        }
        .solution-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .solution-card:hover .solution-img img {
            transform: scale(1.05);
        }
        .solution-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .solution-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }
        .solution-desc {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
            line-height: 1.6;
        }
        .solution-tags {
            margin-top: auto;
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .solution-tags span {
            font-size: 12px;
            background: #f1f5f9;
            color: #475569;
            padding: 3px 8px;
            border-radius: 4px;
        }

        /* 板块 6: 算法中台演示 */
        .demo-layout {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 40px;
            align-items: center;
        }
        .demo-flow {
            list-style: none;
        }
        .demo-step {
            position: relative;
            padding-left: 36px;
            margin-bottom: 24px;
        }
        .demo-step::before {
            content: '';
            position: absolute;
            left: 11px;
            top: 24px;
            bottom: -24px;
            width: 2px;
            background: var(--border-light);
        }
        .demo-step:last-child::before {
            display: none;
        }
        .demo-dot {
            position: absolute;
            left: 0;
            top: 2px;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary);
            color: #ffffff;
            font-size: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }
        .demo-panel {
            background: #0f172a;
            border-radius: var(--radius-md);
            padding: 24px;
            color: #ffffff;
            box-shadow: 0 16px 32px rgba(15, 23, 42, 0.2);
        }
        .panel-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding-bottom: 12px;
            margin-bottom: 16px;
            font-size: 14px;
            color: #94a3b8;
        }
        .panel-metrics {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 12px;
            margin-bottom: 16px;
        }
        .metric-box {
            background: rgba(255, 255, 255, 0.05);
            padding: 12px;
            border-radius: var(--radius-sm);
            text-align: center;
        }
        .metric-val {
            font-size: 20px;
            font-weight: 700;
            color: var(--secondary);
        }
        .metric-name {
            font-size: 12px;
            color: #94a3b8;
        }

        /* 板块 7: 深色案例与底层技术理念 */
        .dark-case-section {
            background: #1e293b;
            color: #ffffff;
            padding: 80px 0;
        }
        .dark-case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .dark-card {
            background: #0f172a;
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 32px;
        }
        .dark-card h3 {
            font-size: 20px;
            margin-bottom: 12px;
            color: #38bdf8;
        }
        .dark-card p {
            color: #cbd5e1;
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
        }

        /* 板块 8: 结果对比 (表格) */
        .comparison-table-wrap {
            background: #ffffff;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
            border: 1px solid var(--border-light);
        }
        .comp-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 14px;
        }
        .comp-table th, .comp-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-light);
        }
        .comp-table th {
            background: #f8fafc;
            color: var(--text-dark);
            font-weight: 700;
        }
        .comp-table tr:last-child td {
            border-bottom: none;
        }
        .highlight-col {
            background: rgba(15, 82, 186, 0.02);
            color: var(--primary);
            font-weight: 600;
        }

        /* 板块 9: 里程碑/演进路径 */
        .timeline-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .timeline-item {
            background: #ffffff;
            padding: 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            position: relative;
        }
        .timeline-phase {
            font-size: 12px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 8px;
        }
        .timeline-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .timeline-desc {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* 板块 10: 平台保障/安全体系 */
        .compliance-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .comp-item {
            background: #ffffff;
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-subtle);
        }
        .comp-icon {
            width: 44px;
            height: 44px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-weight: 800;
            font-size: 18px;
        }
        .comp-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .comp-desc {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 板块 11: 资讯动态 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .news-card {
            background: #ffffff;
            border-radius: var(--radius-md);
            padding: 24px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-subtle);
            display: flex;
            flex-direction: column;
        }
        .news-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .news-heading {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-snippet {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 板块 12: 用户口碑 */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .test-card {
            background: #ffffff;
            border-radius: var(--radius-md);
            padding: 28px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-subtle);
        }
        .test-quote {
            font-size: 14px;
            color: var(--text-regular);
            line-height: 1.7;
            margin-bottom: 20px;
            position: relative;
        }
        .test-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .author-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
        }
        .author-name {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-dark);
        }
        .author-org {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 板块 13: 快速解答/FAQ */
        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: #ffffff;
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            border: 1px solid var(--border-light);
            overflow: hidden;
        }
        .faq-item summary {
            padding: 20px 24px;
            font-weight: 700;
            color: var(--text-dark);
            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(--primary);
            transition: transform 0.2s ease;
        }
        .faq-item[open] summary::after {
            transform: rotate(45deg);
        }
        .faq-content {
            padding: 0 24px 20px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 板块 14: 底部预约转化区 */
        .contact-banner {
            background: linear-gradient(135deg, #f8fafc 0%, #ebf2fc 100%);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 48px;
            box-shadow: var(--shadow-subtle);
        }
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .form-box {
            background: #ffffff;
            padding: 32px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 6px;
        }
        .form-control {
            width: 100%;
            height: 42px;
            border: 1px solid #cbd5e1;
            border-radius: var(--radius-sm);
            padding: 0 12px;
            font-size: 14px;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
        }

        /* 页脚 */
        .footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 24px;
            font-size: 14px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 20px;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 16px;
        }
        .footer-title {
            font-size: 15px;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 16px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            font-size: 13px;
            color: #64748b;
        }

        /* 移动端浮动转化条 */
        .floating-bar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            padding: 12px 20px;
            border-top: 1px solid var(--border-light);
            box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.05);
            z-index: 999;
            align-items: center;
            justify-content: space-between;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .hero-grid, .arch-grid, .demo-layout, .contact-grid {
                grid-template-columns: 1fr;
            }
            .features-grid, .solutions-grid, .news-grid, .testimonials-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .timeline-grid, .compliance-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .kpi-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .kpi-item:nth-child(2) {
                border-right: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .topbar {
                display: none;
            }
            .section-padding {
                padding: 50px 0;
            }
            .features-grid, .solutions-grid, .news-grid, .testimonials-grid, .dark-case-grid {
                grid-template-columns: 1fr;
            }
            .timeline-grid, .compliance-grid, .kpi-grid {
                grid-template-columns: 1fr;
            }
            .kpi-item {
                border-right: none;
                border-bottom: 1px solid var(--border-light);
            }
            .kpi-item:last-child {
                border-bottom: none;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .hero-content h1 {
                font-size: 28px;
            }
            .floating-bar {
                display: flex;
            }
            body {
                padding-bottom: 60px;
            }
        }