<style>
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --secondary: #0f172a;
            --accent: #f97316;
            --bg: #f8fafc;
            --card-bg: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --border: #e2e8f0;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --radius: 16px;
            --transition: 0.25s ease;
        }
        * { margin:0; padding:0; box-sizing:border-box; }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: linear-gradient(135deg, #f0f4ff 0%, #ffffff 100%);
            color: var(--text);
            line-height: 1.6;
        }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        /* 头部导航 */
        header {
            background: rgba(255,255,255,0.85);
            backdrop-filter: blur(12px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }
        .nav-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo span { background: var(--primary); color:#fff; padding:4px 12px; border-radius: 8px; font-size:1rem; }
        nav ul { display: flex; gap: 32px; list-style: none; }
        nav ul li a {
            text-decoration: none;
            font-weight: 500;
            color: var(--secondary);
            transition: color var(--transition);
            font-size: 1rem;
        }
        nav ul li a:hover { color: var(--primary); }
        /* 按钮 */
        .btn {
            display: inline-block;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition);
            cursor: pointer;
            border: none;
            font-size: 1rem;
        }
        .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(26,86,219,0.4); }
        .btn-primary:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26,86,219,0.5); }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
        .btn-outline:hover { background: var(--primary); color: #fff; }

        section { padding: 100px 0; }
        .page-title {
            font-size: 2.5rem;
            font-weight: 800;
            text-align: center;
            margin-bottom: 16px;
            color: var(--secondary);
        }
        .page-subtitle {
            text-align: center;
            color: var(--text-light);
            font-size: 1.15rem;
            margin-bottom: 64px;
            max-width: 650px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 新增：数据信任横幅 */
        .trust-strip {
            display: flex;
            justify-content: center;
            gap: 48px;
            flex-wrap: wrap;
            background: #ffffff;
            border-radius: var(--radius);
            padding: 32px 40px;
            box-shadow: var(--shadow);
            margin-bottom: 60px;
        }
        .trust-item {
            text-align: center;
            min-width: 120px;
        }
        .trust-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
        }
        .trust-label { color: var(--text-light); font-size: 0.95rem; }

        /* 平台下载卡片 */
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            margin-bottom: 70px;
        }
        .platform-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 36px 20px;
            box-shadow: var(--shadow);
            text-align: center;
            transition: transform var(--transition), box-shadow var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .platform-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.1);
        }
        .platform-icon {
            font-size: 3.2rem;
            margin-bottom: 20px;
            background: #eff6ff;
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 24px;
        }
        .platform-card h3 {
            font-size: 1.4rem;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .version {
            color: var(--text-light);
            font-size: 0.9rem;
            margin-bottom: 20px;
        }
        .btn-dl { margin-top: auto; width: 100%; }

        /* 系统要求卡片 */
        .requirements-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
            margin-bottom: 60px;
        }
        .req-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px 24px;
            box-shadow: var(--shadow);
        }
        .req-card h4 { font-size: 1.2rem; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
        .req-list { list-style: none; color: var(--text-light); font-size: 0.95rem; display: flex; flex-direction: column; gap: 8px; }

        /* 更新日志 */
        .changelog {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
            margin-bottom: 60px;
        }
        .changelog h3 { font-size: 1.5rem; margin-bottom: 20px; }
        .log-entry { border-left: 3px solid var(--primary-light); padding-left: 20px; margin-bottom: 20px; }
        .log-version { font-weight: 700; color: var(--primary); }
        .log-date { font-size: 0.9rem; color: var(--text-light); margin-left: 10px; }
        .log-list { margin-top: 8px; list-style: disc; padding-left: 20px; color: var(--text-light); }

        /* 安装说明与安全提示 */
        .install-guide {
            background: #ffffff;
            border-radius: var(--radius);
            padding: 40px 48px;
            box-shadow: var(--shadow);
            margin-bottom: 60px;
            border-left: 5px solid var(--primary);
        }
        .install-guide h3 { font-size: 1.5rem; margin-bottom: 20px; color: var(--secondary); }
        .install-steps {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin-bottom: 24px;
        }
        .install-steps li {
            display: flex;
            gap: 12px;
            align-items: baseline;
        }
        .step-number {
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            width: 28px;
            height: 28px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .safe-note {
            background: #f0fdf4;
            padding: 20px;
            border-radius: 12px;
            display: flex;
            gap: 16px;
            align-items: center;
        }
        .safe-icon-large { font-size: 2.2rem; }

        /* FAQ 下载帮助 */
        .faq-accordion details {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 20px 28px;
            margin-bottom: 12px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
            cursor: pointer;
            transition: background var(--transition);
        }
        .faq-accordion details[open] { background: #f8fafc; }
        .faq-accordion summary {
            font-weight: 600;
            font-size: 1.05rem;
            list-style: none;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .faq-accordion summary::before { content: "❓"; }
        .faq-accordion details[open] summary::before { content: "✅"; }
        .faq-answer { margin-top: 12px; padding-left: 28px; color: var(--text-light); }

        /* 用户评价 */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .testimonial-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
        }
        .testimonial-card .quote { font-style: italic; margin-bottom: 12px; }
        .stars { color: #fbbf24; }
        .user-info { font-size: 0.9rem; color: var(--text-light); }

        /* 其他资源 */
        .other-resources { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin-top: 60px; }
        .resource-link {
            background: var(--card-bg);
            padding: 16px 32px;
            border-radius: 50px;
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
            box-shadow: var(--shadow);
            transition: background var(--transition);
        }
        .resource-link:hover { background: #eff6ff; }

        /* 底部（与首页一致） */
        footer {
            background: linear-gradient(180deg, #111827 0%, #0f172a 100%);
            color: #cbd5e1;
            padding: 64px 0 20px;
            margin-top: 100px;
            border-top: 1px solid #334155;
        }
        .footer-grid {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 40px;
        }
        .footer-brand { max-width: 260px; }
        .footer-logo { font-size: 1.8rem; font-weight: 700; color: #fff; margin-bottom: 12px; display: flex; align-items: center; gap: 6px; }
        .footer-desc { color: #94a3b8; font-size: 0.95rem; line-height: 1.6; margin-bottom: 20px; }
        .social-icons { display: flex; gap: 16px; font-size: 1.5rem; }
        .social-icons a { color: #94a3b8; text-decoration: none; transition: color var(--transition); }
        .social-icons a:hover { color: #fff; }
        .footer-links-group { display: flex; gap: 64px; flex-wrap: wrap; }
        .footer-col h4 { color: #fff; margin-bottom: 20px; font-size: 1rem; font-weight: 600; }
        .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
        .footer-col ul li a { color: #94a3b8; text-decoration: none; font-size: 0.9rem; transition: color var(--transition); }
        .footer-col ul li a:hover { color: #fff; }
        .copyright-bar {
            border-top: 1px solid #1e293b; padding-top: 24px; text-align: center;
            font-size: 0.85rem; color: #64748b; display: flex;
            justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
        }
        .copyright-bar a { color: #64748b; text-decoration: none; }
        .copyright-bar a:hover { color: #94a3b8; }

        @media (max-width: 768px) {
            .nav-bar { flex-direction: column; gap: 12px; }
            .footer-grid { flex-direction: column; gap: 32px; }
            .footer-links-group { gap: 32px; }
        }
    </style>