/* roulang page: index */
:root {
            --primary-bg: #0b0f19;
            --secondary-bg: #111827;
            --card-dark: #162032;
            --accent-cyan: #00f2fe;
            --accent-blue: #4facfe;
            --text-main: #f1f5f9;
            --text-muted: #94a3b8;
            --border-dark: rgba(255, 255, 255, 0.08);
            --border-light: #e2e8f0;
            --white-bg: #ffffff;
            --gray-light: #f8fafc;
            --transition-base: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --radius-md: 10px;
            --radius-lg: 16px;
            --box-shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.35);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--primary-bg);
            color: var(--text-main);
            line-height: 1.75;
            overflow-x: hidden;
            box-sizing: border-box;
        }

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

        /* 顶部次级导航条（机房节点状态） */
        .top-status-bar {
            background-color: #060911;
            font-size: 0.82rem;
            border-bottom: 1px solid var(--border-dark);
            color: var(--text-muted);
            padding: 7px 0;
        }
        .node-badge {
            display: inline-flex;
            align-items: center;
            padding: 2px 8px;
            border-radius: 20px;
            background: rgba(0, 242, 254, 0.1);
            color: var(--accent-cyan);
            font-size: 0.75rem;
            margin-right: 12px;
        }
        .node-badge .status-dot {
            width: 7px;
            height: 7px;
            background-color: #10b981;
            border-radius: 50%;
            margin-right: 5px;
            box-shadow: 0 0 6px #10b981;
        }
        .region-switch a {
            color: var(--text-muted);
            margin-left: 12px;
            font-size: 0.78rem;
        }
        .region-switch a:hover {
            color: var(--accent-cyan);
        }

        /* 主导航条 */
        .site-navbar {
            background: rgba(11, 15, 25, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-dark);
            position: sticky;
            top: 0;
            z-index: 1030;
            padding: 14px 0;
        }
        .navbar-brand {
            font-size: 1.35rem;
            font-weight: 700;
            color: #ffffff !important;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .navbar-brand i {
            color: var(--accent-cyan);
            font-size: 1.5rem;
        }
        .nav-link {
            color: #cbd5e1 !important;
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 16px !important;
            border-radius: 6px;
        }
        .nav-link:hover, .nav-link:focus {
            color: var(--accent-cyan) !important;
            background: rgba(255, 255, 255, 0.04);
        }
        .btn-brand-cta {
            background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
            color: #0b0f19 !important;
            font-weight: 600;
            border: none;
            padding: 9px 22px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0, 242, 254, 0.25);
            transition: var(--transition-base);
        }
        .btn-brand-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 242, 254, 0.4);
            color: #000 !important;
        }

        /* 首屏 Hero */
        .hero-section {
            position: relative;
            padding: 70px 0 90px 0;
            background-color: #080c15;
            background-image: radial-gradient(circle at 80% 20%, rgba(0, 242, 254, 0.08) 0%, transparent 60%), radial-gradient(circle at 10% 80%, rgba(79, 172, 254, 0.05) 0%, transparent 50%);
            border-bottom: 1px solid var(--border-dark);
        }
        .carousel-item {
            min-height: 480px;
        }
        .hero-title {
            font-size: 2.75rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 1.25rem;
            letter-spacing: -0.5px;
        }
        .hero-title .gradient-text {
            background: linear-gradient(90deg, #00f2fe, #4facfe);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            margin-bottom: 2rem;
            max-width: 620px;
        }
        .btn-outline-glow {
            border: 1px solid rgba(0, 242, 254, 0.5);
            color: var(--accent-cyan);
            padding: 9px 22px;
            border-radius: 8px;
            font-weight: 600;
            background: rgba(0, 242, 254, 0.04);
            transition: var(--transition-base);
        }
        .btn-outline-glow:hover {
            background: rgba(0, 242, 254, 0.15);
            color: #ffffff;
            border-color: var(--accent-cyan);
            transform: translateY(-2px);
        }

        /* 板块公共规则 */
        .section-block {
            padding: 85px 0;
            position: relative;
        }
        .section-block.bg-alt {
            background-color: var(--secondary-bg);
            border-top: 1px solid var(--border-dark);
            border-bottom: 1px solid var(--border-dark);
        }
        .section-title-wrap {
            margin-bottom: 50px;
        }
        .section-tag {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 1px;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 8px;
        }
        .section-heading {
            font-size: 2.1rem;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: -0.5px;
            margin-bottom: 14px;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 760px;
            margin: 0 auto;
        }

        /* 卡片公用样式 */
        .tech-card {
            background: var(--card-dark);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: var(--transition-base);
            height: 100%;
            position: relative;
        }
        .tech-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 242, 254, 0.3);
            box-shadow: 0 12px 30px -8px rgba(0, 242, 254, 0.12);
        }
        .card-icon-box {
            width: 52px;
            height: 52px;
            border-radius: 10px;
            background: rgba(0, 242, 254, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--accent-cyan);
            margin-bottom: 20px;
        }

        /* 板块5：指标看板 */
        .metric-card {
            background: #0d131f;
            border: 1px solid rgba(0, 242, 254, 0.15);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
        }
        .metric-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: #ffffff;
            font-family: monospace;
            background: linear-gradient(180deg, #ffffff, #94a3b8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .metric-unit {
            font-size: 0.9rem;
            color: var(--accent-cyan);
            margin-left: 2px;
        }
        .metric-label {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-top: 6px;
        }

        /* 板块6：架构对比表格 */
        .compare-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            background: var(--card-dark);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-dark);
        }
        .compare-table th, .compare-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-dark);
            vertical-align: middle;
        }
        .compare-table thead th {
            background: #090e17;
            color: #ffffff;
            font-size: 1.05rem;
            font-weight: 600;
        }
        .compare-table tbody tr:last-child td {
            border-bottom: none;
        }
        .compare-highlight {
            background: rgba(0, 242, 254, 0.03);
            color: var(--accent-cyan);
            font-weight: 600;
        }

        /* 板块7：时间线 */
        .timeline-container {
            position: relative;
            padding: 20px 0;
        }
        .timeline-line {
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 2px;
            background: rgba(255, 255, 255, 0.1);
            transform: translateX(-50%);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 40px;
        }
        .timeline-point {
            position: absolute;
            left: 50%;
            top: 15px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--accent-cyan);
            box-shadow: 0 0 10px var(--accent-cyan);
            transform: translateX(-50%);
            z-index: 2;
        }

        /* 案例图片 */
        .case-img-box {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            height: 220px;
            border: 1px solid var(--border-dark);
        }
        .case-img-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition-base);
        }
        .case-img-box:hover img {
            transform: scale(1.05);
        }

        /* FAQ 手风琴自定义 */
        .accordion-item {
            background-color: var(--card-dark) !important;
            border: 1px solid var(--border-dark) !important;
            border-radius: var(--radius-md) !important;
            margin-bottom: 12px;
            overflow: hidden;
        }
        .accordion-button {
            background-color: var(--card-dark) !important;
            color: #ffffff !important;
            font-weight: 600;
            padding: 18px 24px;
            box-shadow: none !important;
        }
        .accordion-button:not(.collapsed) {
            color: var(--accent-cyan) !important;
            background: rgba(0, 242, 254, 0.05) !important;
        }
        .accordion-button::after {
            filter: invert(1);
        }
        .accordion-body {
            color: var(--text-muted);
            padding: 20px 24px;
            line-height: 1.8;
            border-top: 1px solid var(--border-dark);
        }

        /* 转化表单 */
        .cta-card-wrapper {
            background: linear-gradient(145deg, #131b2c 0%, #0d131f 100%);
            border: 1px solid rgba(0, 242, 254, 0.25);
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
        }
        .form-control, .form-select {
            background-color: #090d16 !important;
            border: 1px solid rgba(255, 255, 255, 0.12) !important;
            color: #f1f5f9 !important;
            padding: 12px 16px;
            border-radius: 8px;
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--accent-cyan) !important;
            box-shadow: 0 0 10px rgba(0, 242, 254, 0.2) !important;
        }

        /* 页脚 */
        .site-footer {
            background-color: #060910;
            border-top: 1px solid var(--border-dark);
            padding: 60px 0 30px 0;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .footer-link-group a {
            color: var(--text-muted);
            display: block;
            margin-bottom: 10px;
        }
        .footer-link-group a:hover {
            color: var(--accent-cyan);
            padding-left: 4px;
        }

        @media (max-width: 991px) {
            .timeline-line { left: 20px; }
            .timeline-point { left: 20px; }
            .timeline-content-box { margin-left: 45px !important; text-align: left !important; }
            .hero-title { font-size: 2.1rem; }
        }