/* ========== 全局基础样式（与首页一致） ========== */
        :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%; }

        /* 产品中心 Hero 特有 */
        .product-hero {
            background: linear-gradient(135deg, #0b1120 0%, #1e3a8a 50%, #2563eb 100%);
            color: #fff;
            padding: 90px 0 80px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .product-hero::before {
            content: '';
            position: absolute;
            top: -50%; left: -50%;
            width: 200%; height: 200%;
            background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.08) 0%, transparent 60%);
            pointer-events: none;
            animation: heroGlow 8s ease-in-out infinite alternate;
        }
        @keyframes heroGlow {
            0% { transform: translate(0,0); opacity: 0.7; }
            100% { transform: translate(10%, 10%); opacity: 1; }
        }
        .product-hero .container { position: relative; z-index: 2; }
        .product-hero h1 {
            font-size: 46px;
            font-weight: 800;
            letter-spacing: -1.5px;
            margin-bottom: 18px;
            background: linear-gradient(135deg, #ffffff 0%, #dbeafe 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .product-hero p {
            font-size: 18px;
            color: rgba(255,255,255,0.85);
            max-width: 750px;
            margin: 0 auto 30px;
            line-height: 1.8;
        }
        .product-badge {
            display: inline-block;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.25);
            color: #fff;
            padding: 6px 20px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 28px;
        }

        /* 通用 section 标题 */
        .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; }

        /* 架构图版块 */
        .architecture-section { padding: 90px 0; background: #f8faff; }
        .arch-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 30px; margin-top: 40px; }
        .arch-card {
            background: #fff; border-radius: 24px; padding: 32px 26px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.03); border: 1px solid #eef2f6;
            transition: all 0.3s ease; position: relative; overflow: hidden;
        }
        .arch-card:hover { transform: translateY(-6px); box-shadow: 0 20px 40px rgba(37,99,235,0.1); border-color: #dbeafe; }
        .arch-card::after { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, #2563eb, #7c3aed); opacity: 0; transition: opacity 0.3s; }
        .arch-card:hover::after { opacity: 1; }
        .arch-icon { width: 52px; height: 52px; background: linear-gradient(135deg, #eff6ff, #e0e7ff); border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 26px; margin-bottom: 20px; }
        .arch-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; color: #0f172a; }
        .arch-card p { font-size: 15px; color: #475569; line-height: 1.7; }

        /* 传输优化展示 */
        .optimization-showcase {
            display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
            align-items: center; padding: 80px 0;
        }
        .optimization-text h2 { font-size: 32px; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 16px; color: #0f172a; }
        .optimization-text p { color: #475569; font-size: 16px; margin-bottom: 12px; }
        .optimization-list { list-style: none; margin-top: 20px; }
        .optimization-list li { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 16px; font-size: 15px; color: #1e293b; }
        .check-icon { background: #dcfce7; color: #16a34a; border-radius: 50%; width: 24px; height: 24px; display: inline-flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; margin-top: 2px; }
        .optimization-visual { background: #fff; border-radius: 24px; padding: 30px; box-shadow: 0 20px 40px rgba(0,0,0,0.05); border: 1px solid #eef2f6; }
        .latency-bars { display: flex; flex-direction: column; gap: 16px; }
        .latency-item { display: flex; align-items: center; gap: 14px; }
        .latency-label { width: 70px; font-weight: 600; font-size: 13px; color: #64748b; }
        .latency-track { flex: 1; height: 8px; background: #f1f5f9; border-radius: 10px; overflow: hidden; }
        .latency-fill { height: 100%; border-radius: 10px; background: linear-gradient(90deg, #2563eb, #7c3aed); transition: width 1s ease; }
        .latency-value { width: 50px; text-align: right; font-weight: 700; font-size: 13px; color: #1e293b; }

        /* 加密安全协议 */
        .security-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; margin-top: 40px; }
        .security-card {
            background: #fff; border-radius: 20px; padding: 28px 24px; text-align: center;
            border: 1px solid #eef2f6; transition: all 0.3s;
        }
        .security-card:hover { border-color: #bfdbfe; box-shadow: 0 12px 30px rgba(37,99,235,0.08); transform: translateY(-3px); }
        .security-icon { font-size: 36px; margin-bottom: 16px; }
        .security-card h4 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: #0f172a; }
        .security-card p { font-size: 14px; color: #475569; line-height: 1.6; }

        /* 迭代路线图 */
        .roadmap-timeline { position: relative; max-width: 800px; margin: 60px auto 0; padding-left: 40px; }
        .roadmap-timeline::before { content: ''; position: absolute; left: 18px; top: 0; bottom: 0; width: 3px; background: linear-gradient(180deg, #2563eb, #7c3aed); border-radius: 3px; }
        .timeline-item { position: relative; margin-bottom: 40px; padding-left: 20px; }
        .timeline-item::before { content: ''; position: absolute; left: -12px; top: 6px; width: 16px; height: 16px; background: #fff; border: 4px solid #2563eb; border-radius: 50%; box-shadow: 0 0 0 4px rgba(37,99,235,0.2); }
        .timeline-date { font-weight: 700; color: #2563eb; font-size: 14px; letter-spacing: 0.5px; text-transform: uppercase; }
        .timeline-content { background: #fff; border-radius: 16px; padding: 20px 24px; box-shadow: 0 8px 24px rgba(0,0,0,0.03); border: 1px solid #eef2f6; margin-top: 8px; }
        .timeline-content h4 { font-size: 17px; font-weight: 700; color: #0f172a; margin-bottom: 6px; }
        .timeline-content p { font-size: 14px; color: #64748b; line-height: 1.6; }

        /* 其他通用 */
        .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); }

        .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); }

        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; }
            .product-hero h1 { font-size: 36px; }
        }
        @media (max-width: 768px) {
            .product-hero { padding: 60px 0 50px; }
            .product-hero h1 { font-size: 28px; letter-spacing: -0.5px; }
            .product-hero p { font-size: 16px; }
            .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; }
            .optimization-showcase { grid-template-columns: 1fr; }
            .arch-grid { grid-template-columns: 1fr; }
            .security-grid { grid-template-columns: 1fr 1fr; }
            .roadmap-timeline { padding-left: 20px; }
            .cta-button { padding: 14px 24px; font-size: 14px; }
        }
        @media (max-width: 480px) {
            .product-hero h1 { font-size: 24px; }
            .product-hero p { font-size: 14px; }
            .logo-text { font-size: 16px; }
            .logo-svg { width: 28px; height: 28px; }
            .container { padding: 0 16px; }
            .security-grid { grid-template-columns: 1fr; }
        }