:root {
            --primary-color: #2563eb;
            --primary-hover: #1d4ed8;
            --primary-light: #dbeafe;
            --accent-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
            --text-main: #111827;
            --text-muted: #4b5563;
            --text-light: #6b7280;
            --bg-light: #f9fafb;
            --bg-white: #ffffff;
            --border-color: #e5e7eb;
            --border-light: #f3f4f6;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 20px rgba(37, 99, 235, 0.08);
            --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-full: 50px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
            color: var(--text-main);
            line-height: 1.7;
            background-color: var(--bg-white);
            overflow-x: hidden;
        }

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

        .container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== 顶部导航 ========== */
        header {
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            background-color: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 1000;
            transition: var(--transition);
        }

        header.scrolled {
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
        }

        .nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            gap: 20px;
        }

        .logo-container {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-svg {
            width: 36px;
            height: 36px;
            filter: drop-shadow(0 2px 6px rgba(37, 99, 235, 0.3));
            transition: var(--transition);
        }

        .logo-container:hover .logo-svg {
            transform: scale(1.05);
        }

        .logo-text {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary-color);
            letter-spacing: -0.5px;
            white-space: nowrap;
        }

        .logo-text span {
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 22px;
            align-items: center;
        }

        nav a {
            font-weight: 500;
            color: var(--text-muted);
            font-size: 14px;
            transition: var(--transition);
            position: relative;
            padding: 6px 2px;
            white-space: nowrap;
        }

        nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--accent-gradient);
            border-radius: 2px;
            transition: var(--transition);
        }

        nav a:hover,
        nav a.active {
            color: var(--primary-color);
        }

        nav a:hover::after,
        nav a.active::after {
            width: 100%;
        }

        /* ========== Hero 主视觉 ========== */
        .hero {
            padding: 90px 0 70px;
            text-align: center;
            background: linear-gradient(180deg, #eff6ff 0%, #f0f4ff 30%, #ffffff 100%);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -120px;
            left: 50%;
            transform: translateX(-50%);
            width: 800px;
            height: 400px;
            background: radial-gradient(ellipse at center, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -80px;
            right: -60px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(124, 58, 237, 0.06) 0%, transparent 70%);
            pointer-events: none;
            border-radius: 50%;
        }

        .hero .container {
            position: relative;
            z-index: 1;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--primary-light);
            color: var(--primary-color);
            font-size: 13px;
            font-weight: 600;
            padding: 8px 20px;
            border-radius: var(--radius-full);
            margin-bottom: 24px;
            letter-spacing: 0.5px;
            animation: fadeInUp 0.6s ease-out;
        }

        .hero-badge .dot {
            width: 6px;
            height: 6px;
            background-color: var(--primary-color);
            border-radius: 50%;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.4;
                transform: scale(1.5);
            }
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .hero h1 {
            font-size: 46px;
            margin-bottom: 18px;
            color: var(--text-main);
            letter-spacing: -1.5px;
            line-height: 1.25;
            font-weight: 800;
            animation: fadeInUp 0.7s ease-out 0.1s backwards;
        }

        .hero h1 .gradient-text {
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero p {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 720px;
            margin: 0 auto 36px;
            line-height: 1.8;
            animation: fadeInUp 0.7s ease-out 0.2s backwards;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
            animation: fadeInUp 0.7s ease-out 0.3s backwards;
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent-gradient);
            color: #ffffff;
            padding: 16px 40px;
            font-size: 16px;
            font-weight: 700;
            border-radius: var(--radius-full);
            transition: var(--transition);
            box-shadow: 0 8px 30px rgba(37, 99, 235, 0.35);
            letter-spacing: 0.3px;
        }

        .cta-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(37, 99, 235, 0.45);
        }

        .cta-button-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: #ffffff;
            color: var(--primary-color);
            padding: 16px 32px;
            font-size: 16px;
            font-weight: 600;
            border-radius: var(--radius-full);
            border: 2px solid var(--primary-light);
            transition: var(--transition);
            letter-spacing: 0.3px;
        }

        .cta-button-secondary:hover {
            border-color: var(--primary-color);
            background-color: var(--bg-light);
            transform: translateY(-2px);
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 50px;
            margin-top: 50px;
            flex-wrap: wrap;
            animation: fadeInUp 0.7s ease-out 0.4s backwards;
        }

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

        .hero-stat .number {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary-color);
            letter-spacing: -1px;
        }

        .hero-stat .label {
            font-size: 13px;
            color: var(--text-light);
            margin-top: 4px;
        }

        /* ========== 核心特性 ========== */
        .features {
            padding: 80px 0;
            background-color: var(--bg-white);
        }

        .section-title {
            text-align: center;
            font-size: 32px;
            margin-bottom: 14px;
            letter-spacing: -0.8px;
            font-weight: 800;
            color: var(--text-main);
        }

        .section-subtitle {
            text-align: center;
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 24px;
        }

        .feature-card {
            border: 1px solid var(--border-light);
            padding: 32px 28px;
            border-radius: var(--radius-lg);
            background-color: var(--bg-white);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--accent-gradient);
            opacity: 0;
            transition: var(--transition);
        }

        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            font-size: 22px;
        }

        .feature-card h3 {
            font-size: 18px;
            margin-bottom: 10px;
            color: var(--text-main);
            font-weight: 700;
            letter-spacing: -0.3px;
        }

        .feature-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ========== 全球网络版块 ========== */
        .global-network {
            padding: 80px 0;
            background: linear-gradient(180deg, var(--bg-light) 0%, #ffffff 100%);
        }

        .network-visual {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
            margin-top: 20px;
        }

        .network-info h3 {
            font-size: 24px;
            margin-bottom: 18px;
            color: var(--text-main);
            letter-spacing: -0.5px;
            font-weight: 700;
        }

        .network-info p {
            color: var(--text-muted);
            margin-bottom: 14px;
            font-size: 15px;
            line-height: 1.8;
        }

        .region-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }

        .region-tag {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: var(--radius-full);
            font-size: 13px;
            font-weight: 600;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .region-tag:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
            background-color: var(--primary-light);
        }

        .network-map {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 14px;
        }

        .map-node {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 18px 14px;
            text-align: center;
            transition: var(--transition);
            cursor: pointer;
        }

        .map-node:hover {
            border-color: var(--primary-color);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .map-node .node-name {
            font-weight: 700;
            font-size: 14px;
            color: var(--text-main);
        }
        .map-node .node-region {
            font-size: 11px;
            color: var(--text-light);
            margin-top: 2px;
        }
        .map-node .node-latency {
            font-size: 12px;
            color: var(--primary-color);
            font-weight: 600;
            margin-top: 6px;
        }

        /* ========== 场景中心预览 ========== */
        .scenarios-preview {
            padding: 80px 0;
            background-color: var(--bg-white);
        }

        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .scenario-card {
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            background: linear-gradient(145deg, #f8faff 0%, #ffffff 100%);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            text-align: center;
        }

        .scenario-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }

        .scenario-emoji {
            font-size: 40px;
            margin-bottom: 16px;
        }

        .scenario-card h3 {
            font-size: 18px;
            margin-bottom: 10px;
            font-weight: 700;
            color: var(--text-main);
        }

        .scenario-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ========== 步骤 ========== */
        .steps {
            padding: 80px 0;
            background: linear-gradient(180deg, var(--bg-light) 0%, #ffffff 100%);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 24px;
            text-align: center;
        }

        .step-item {
            padding: 32px 20px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            position: relative;
        }

        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }

        .step-number {
            width: 48px;
            height: 48px;
            background: var(--accent-gradient);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-weight: 800;
            font-size: 18px;
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
        }

        .step-item h3 {
            font-size: 17px;
            margin-bottom: 10px;
            font-weight: 700;
            color: var(--text-main);
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .step-item a {
            color: var(--primary-color);
            font-weight: 600;
        }

        /* ========== 表格版块 ========== */
        .table-section {
            padding: 80px 0;
            background-color: var(--bg-white);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .comparison-table th,
        .comparison-table td {
            border: 1px solid var(--border-light);
            padding: 14px 18px;
            text-align: left;
            font-size: 14px;
        }

        .comparison-table th {
            background: linear-gradient(135deg, #f0f4ff 0%, #e8eeff 100%);
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: 0.3px;
        }

        .comparison-table tr:hover td {
            background-color: #fafbff;
        }

        .comparison-table a {
            color: var(--primary-color);
            font-weight: 600;
        }

        .badge {
            display: inline-block;
            padding: 3px 10px;
            border-radius: var(--radius-full);
            font-size: 11px;
            font-weight: 700;
            background-color: #dcfce7;
            color: #16a34a;
            letter-spacing: 0.3px;
        }

        /* ========== 洞察/数据版块 ========== */
        .insights-preview {
            padding: 80px 0;
            background: linear-gradient(180deg, var(--bg-light) 0%, #ffffff 100%);
        }

        .insights-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
        }

        .insight-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 24px 22px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
            cursor: pointer;
        }

        .insight-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
            transform: translateY(-2px);
        }

        .insight-card .insight-date {
            font-size: 11px;
            color: var(--text-light);
            text-transform: uppercase;
            letter-spacing: 0.8px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .insight-card h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
            line-height: 1.5;
        }

        .insight-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ========== FAQ预览 ========== */
        .faq-preview {
            padding: 80px 0;
            background-color: var(--bg-white);
        }

        .faq-item {
            margin-bottom: 16px;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            transition: var(--transition);
            background-color: var(--bg-white);
        }

        .faq-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }

        .faq-item h3 {
            font-size: 16px;
            margin-bottom: 8px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: -0.2px;
        }

        .faq-item p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .faq-item a {
            color: var(--primary-color);
            font-weight: 600;
        }

        /* ========== 页脚 ========== */
        footer {
            border-top: 1px solid var(--border-light);
            padding: 50px 0 30px;
            text-align: center;
            color: var(--text-muted);
            font-size: 13px;
            background-color: var(--bg-light);
        }

        .footer-links {
            margin-bottom: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
        }

        .footer-links a {
            color: var(--text-muted);
            font-weight: 500;
            font-size: 13px;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: var(--primary-color);
        }

        .footer-brand {
            font-weight: 700;
            color: var(--text-main);
            font-size: 14px;
            margin-bottom: 6px;
        }

        .footer-domain {
            color: var(--text-light);
            font-size: 12px;
            margin-bottom: 16px;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            nav ul {
                gap: 14px;
            }
            nav a {
                font-size: 13px;
            }
            .hero h1 {
                font-size: 36px;
            }
        }

        @media (max-width: 768px) {
            .hero {
                padding: 60px 0 50px;
            }
            .hero h1 {
                font-size: 28px;
                letter-spacing: -0.5px;
            }
            .hero p {
                font-size: 16px;
            }
            .hero-stats {
                gap: 30px;
            }
            .hero-stat .number {
                font-size: 26px;
            }
            .section-title {
                font-size: 24px;
            }
            nav ul {
                gap: 10px;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                padding-bottom: 4px;
            }
            nav a {
                font-size: 12px;
                white-space: nowrap;
            }
            .nav-wrapper {
                height: 60px;
                gap: 10px;
            }
            .logo-text {
                font-size: 18px;
            }
            .network-visual {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .comparison-table {
                display: block;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }
            .comparison-table th,
            .comparison-table td {
                padding: 10px 12px;
                font-size: 12px;
                white-space: nowrap;
            }
            .cta-button,
            .cta-button-secondary {
                padding: 14px 24px;
                font-size: 14px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .scenarios-grid {
                grid-template-columns: 1fr;
            }
            .network-map {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 24px;
            }
            .hero p {
                font-size: 14px;
            }
            .hero-stats {
                gap: 20px;
                flex-direction: column;
                align-items: center;
            }
            .logo-text {
                font-size: 16px;
            }
            .logo-svg {
                width: 28px;
                height: 28px;
            }
            .container {
                padding: 0 16px;
            }
        }