/* roulang page: index */
:root {
            --bg-base: #F8FAFC;
            --bg-surface: #FFFFFF;
            --brand-primary: #0F52BA;
            --brand-primary-dark: #0A3D8F;
            --accent-cyan: #00A8E8;
            --accent-amber: #FF6B00;
            --accent-amber-hover: #E65A00;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
            --dark-section: #0B192C;
            --shadow-sm: 0 4px 12px -2px rgba(15, 23, 42, 0.04);
            --shadow-card: 0 10px 30px -5px rgba(15, 82, 186, 0.06), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
            --shadow-hover: 0 20px 40px -10px rgba(15, 82, 186, 0.14);
            --radius-md: 12px;
            --radius-lg: 16px;
        }

        *, *::before, *::after {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            padding: 0;
            background-color: var(--bg-base);
            color: var(--text-body);
            font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-heading);
            font-weight: 700;
            line-height: 1.3;
        }

        a {
            color: var(--brand-primary);
            text-decoration: none;
            transition: all 0.25s ease;
        }
        a:hover {
            color: var(--brand-primary-dark);
        }

        /* 顶部通栏导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
        }

        .header-topbar {
            background: #0B192C;
            color: #94A3B8;
            font-size: 13px;
            padding: 7px 0;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .header-topbar a {
            color: #CBD5E1;
        }
        .header-topbar a:hover {
            color: #FFFFFF;
        }
        .topbar-badge {
            background: rgba(0, 168, 232, 0.18);
            color: var(--accent-cyan);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 11px;
            font-weight: 600;
            display: inline-block;
            margin-right: 8px;
        }

        .main-navigation {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
        }
        .brand-logo {
            font-size: 20px;
            font-weight: 800;
            color: var(--brand-primary);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .brand-logo svg {
            width: 30px;
            height: 30px;
            fill: var(--brand-primary);
        }
        .nav-menu {
            display: flex;
            gap: 22px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-menu li a {
            color: var(--text-body);
            font-weight: 500;
            font-size: 14px;
            padding: 6px 4px;
            position: relative;
        }
        .nav-menu li a:hover,
        .nav-menu li a.active {
            color: var(--brand-primary);
        }
        .nav-menu li a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--brand-primary);
            transition: width 0.25s ease;
        }
        .nav-menu li a:hover::after {
            width: 100%;
        }

        /* 基础按钮组件 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            padding: 12px 26px;
            border-radius: 8px;
            cursor: pointer;
            border: 1px solid transparent;
            transition: all 0.25s ease;
            font-size: 15px;
            min-height: 44px;
            line-height: 1.2;
            text-decoration: none;
        }
        .btn-primary {
            background-color: var(--brand-primary);
            color: #FFFFFF !important;
            box-shadow: 0 4px 14px rgba(15, 82, 186, 0.25);
        }
        .btn-primary:hover {
            background-color: var(--brand-primary-dark);
            box-shadow: 0 6px 18px rgba(15, 82, 186, 0.35);
            transform: translateY(-2px);
        }
        .btn-amber {
            background-color: var(--accent-amber);
            color: #FFFFFF !important;
            box-shadow: 0 4px 14px rgba(255, 107, 0, 0.28);
        }
        .btn-amber:hover {
            background-color: var(--accent-amber-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(255, 107, 0, 0.38);
        }
        .btn-outline {
            border-color: var(--border-light);
            background: #FFFFFF;
            color: var(--text-body) !important;
        }
        .btn-outline:hover {
            border-color: var(--brand-primary);
            color: var(--brand-primary) !important;
            background: #F1F5F9;
        }

        /* 板块标准样式 */
        .content-section {
            padding: 92px 0;
            position: relative;
        }
        .bg-white {
            background-color: var(--bg-surface);
        }
        .bg-gray {
            background-color: var(--bg-base);
        }
        .bg-dark {
            background-color: var(--dark-section);
            color: #E2E8F0;
        }
        .bg-dark h2, .bg-dark h3 {
            color: #FFFFFF;
        }
        .bg-dark p {
            color: #94A3B8;
        }

        .section-header {
            margin-bottom: 54px;
            text-align: center;
        }
        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--brand-primary);
            background: #EFF6FF;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 14px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .bg-dark .section-tag {
            background: rgba(0, 168, 232, 0.15);
            color: var(--accent-cyan);
        }
        .section-header h2 {
            font-size: 32px;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto;
        }

        /* 卡片基础 */
        .feature-card {
            background: var(--bg-surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-card);
            transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
            height: 100%;
            position: relative;
            display: flex;
            flex-direction: column;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(15, 82, 186, 0.3);
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--brand-primary);
            transition: width 0.3s ease;
            border-top-left-radius: var(--radius-md);
            border-top-right-radius: var(--radius-md);
        }
        .feature-card:hover::before {
            width: 100%;
        }

        /* 板块1：Hero 首屏 */
        .hero-banner {
            position: relative;
            background: linear-gradient(135deg, #09192E 0%, #0F315E 100%);
            color: #FFFFFF;
            padding: 110px 0 120px;
            overflow: hidden;
        }
        .hero-banner-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.18;
            pointer-events: none;
        }
        .hero-badge-wrap {
            display: inline-flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 13px;
            margin-bottom: 24px;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        .hero-pulse {
            width: 8px;
            height: 8px;
            background: #10B981;
            border-radius: 50%;
            margin-right: 10px;
            box-shadow: 0 0 0 rgba(16, 185, 129, 0.6);
            animation: pulse-green 2s infinite;
        }
        @keyframes pulse-green {
            0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
            70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
            100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
        }
        .hero-title {
            color: #FFFFFF;
            font-size: 44px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 24px;
            letter-spacing: -1px;
        }
        .hero-subtitle {
            font-size: 18px;
            color: #CBD5E1;
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 640px;
        }
        .hero-cta-group {
            display: flex;
            gap: 16px;
            align-items: center;
            margin-bottom: 40px;
        }
        .hero-preview-box {
            position: relative;
            background: rgba(15, 23, 42, 0.85);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-lg);
            padding: 12px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }
        .hero-preview-img {
            width: 100%;
            height: auto;
            border-radius: 8px;
            display: block;
        }
        .hero-stat-floating {
            position: absolute;
            bottom: -20px;
            left: -20px;
            background: #FFFFFF;
            color: var(--text-heading);
            padding: 14px 20px;
            border-radius: 10px;
            box-shadow: var(--shadow-hover);
            border: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .hero-stat-num {
            font-size: 24px;
            font-weight: 800;
            color: var(--brand-primary);
            line-height: 1;
        }

        /* 架构技术参数区 */
        .param-table-card {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            padding: 24px;
            margin-top: 36px;
        }
        .param-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }
        .param-item {
            border-left: 3px solid var(--brand-primary);
            padding-left: 14px;
        }
        .param-label {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 4px;
        }
        .param-val {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-heading);
        }

        /* 六大核心优势 */
        .icon-wrap {
            width: 52px;
            height: 52px;
            border-radius: 10px;
            background: #EFF6FF;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--brand-primary);
        }
        .metric-badge {
            margin-top: auto;
            padding-top: 16px;
            border-top: 1px dashed var(--border-light);
            font-size: 13px;
            font-weight: 600;
            color: var(--brand-primary);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* 热门产品模块区 */
        .product-card {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            position: relative;
            transition: all 0.3s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .product-card.featured {
            border: 2px solid var(--brand-primary);
            box-shadow: 0 15px 35px -5px rgba(15, 82, 186, 0.15);
            transform: scale(1.02);
            z-index: 2;
        }
        .product-badge-corner {
            position: absolute;
            top: -12px;
            right: 28px;
            background: var(--brand-primary);
            color: #FFFFFF;
            font-size: 12px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 20px;
            box-shadow: 0 2px 6px rgba(15, 82, 186, 0.4);
        }
        .feature-checklist {
            list-style: none;
            padding: 0;
            margin: 24px 0 32px;
        }
        .feature-checklist li {
            padding: 8px 0;
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--text-body);
        }
        .check-icon {
            width: 18px;
            height: 18px;
            fill: #10B981;
            flex-shrink: 0;
            margin-top: 2px;
        }

        /* 交互场景演示 Tab */
        .scenario-tabs {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        .tab-btn {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            padding: 10px 24px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.2s ease;
            color: var(--text-body);
        }
        .tab-btn.active, .tab-btn:hover {
            background: var(--brand-primary);
            color: #FFFFFF;
            border-color: var(--brand-primary);
        }
        .scenario-panel {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            padding: 36px;
            box-shadow: var(--shadow-card);
        }

        /* 深色架构对比区 */
        .comparison-col {
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius-md);
            padding: 32px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            height: 100%;
        }
        .comparison-col.highlight {
            background: rgba(15, 82, 186, 0.15);
            border: 1px solid rgba(0, 168, 232, 0.4);
        }
        .comparison-list {
            list-style: none;
            padding: 0;
            margin: 20px 0 0;
        }
        .comparison-list li {
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 14px;
        }

        /* 数据指标统计条 */
        .metrics-strip {
            background: linear-gradient(135deg, #0F52BA 0%, #0A3D8F 100%);
            color: #FFFFFF;
            padding: 60px 0;
            box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.15);
        }
        .metric-cell {
            text-align: center;
            padding: 10px 15px;
        }
        .metric-cell .num {
            font-size: 42px;
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 6px;
            font-family: Inter, -apple-system, sans-serif;
            color: #FFFFFF;
        }
        .metric-cell .desc {
            font-size: 14px;
            color: #CBD5E1;
        }

        /* 实战故事区 */
        .case-card-horizontal {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            margin-bottom: 30px;
        }
        .case-img-wrap {
            height: 100%;
            min-height: 280px;
            overflow: hidden;
        }
        .case-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .case-card-horizontal:hover .case-img-wrap img {
            transform: scale(1.05);
        }
        .case-content {
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        /* 口碑卡片 */
        .review-card {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            padding: 28px;
            box-shadow: var(--shadow-card);
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .review-author {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-top: 20px;
        }
        .avatar-placeholder {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #E2E8F0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--brand-primary);
        }

        /* 部署与保障条 */
        .guarantee-bar {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 30px;
            box-shadow: var(--shadow-sm);
        }
        .guarantee-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        .guarantee-icon {
            width: 40px;
            height: 40px;
            flex-shrink: 0;
            background: #EFF6FF;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--brand-primary);
        }

        /* 资讯与白皮书 */
        .news-card {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: all 0.3s ease;
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .news-card img {
            width: 100%;
            height: 170px;
            object-fit: cover;
        }
        .news-body {
            padding: 22px;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }
        .news-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        /* FAQ 手风琴 */
        .faq-accordion {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-question {
            padding: 20px 24px;
            cursor: pointer;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #FFFFFF;
            user-select: none;
        }
        .faq-question:hover {
            background: #F8FAFC;
        }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            background: #F8FAFC;
            color: var(--text-muted);
            font-size: 15px;
        }
        .faq-item.active .faq-answer {
            padding: 16px 24px 24px;
            max-height: 300px;
        }
        .faq-toggle-icon {
            font-size: 20px;
            transition: transform 0.3s ease;
            color: var(--brand-primary);
        }
        .faq-item.active .faq-toggle-icon {
            transform: rotate(45deg);
        }

        /* 转化表单区 */
        .cta-box-wrapper {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-hover);
            padding: 50px;
        }
        .form-control-custom {
            width: 100%;
            height: 46px;
            padding: 10px 14px;
            border-radius: 6px;
            border: 1px solid var(--border-light);
            font-size: 14px;
            margin-bottom: 16px;
            transition: border-color 0.2s;
            background:#FFFFFF;
        }
        .form-control-custom:focus {
            outline: none;
            border-color: var(--brand-primary);
            box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.12);
        }

        /* 底部固定转化条 */
        .bottom-sticky-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            border-top: 2px solid var(--brand-primary);
            padding: 12px 0;
            box-shadow: 0 -8px 24px rgba(15, 23, 42, 0.08);
            z-index: 999;
            backdrop-filter: blur(8px);
        }
        .sticky-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .sticky-info {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .sticky-tag {
            background: #FEF3C7;
            color: #B45309;
            padding: 3px 10px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 700;
        }

        /* 全局页脚 */
        .site-footer {
            background: #081220;
            color: #94A3B8;
            padding: 70px 0 100px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 14px;
        }
        .site-footer h4 {
            color: #FFFFFF;
            font-size: 16px;
            margin-bottom: 20px;
            font-weight: 600;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links li a {
            color: #94A3B8;
        }
        .footer-links li a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            margin-top: 50px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            font-size: 13px;
        }

        /* 响应式调整 */
        @media screen and (max-width: 1024px) {
            .hero-title { font-size: 36px; }
            .nav-menu { display: none; }
            .content-section { padding: 64px 0; }
        }
        @media screen and (max-width: 640px) {
            .hero-title { font-size: 28px; }
            .hero-cta-group { flex-direction: column; align-items: stretch; }
            .hero-stat-floating { position: static; margin-top: 16px; }
            .cta-box-wrapper { padding: 24px; }
            .sticky-info { display: none; }
            .sticky-flex { justify-content: center; width: 100%; }
            .sticky-flex .btn { width: 100%; }
        }