<style>
        :root {
            --primary-blue: #1E88E5;
            --soft-blue: #E3F2FD;
            --dark-blue: #0D47A1;
            --accent-blue: #42A5F5;
            --text-dark: #1a1a2e;
            --text-soft: #4a4a5e;
            --bg-soft: #F8FAFC;
            --border-light: #E2E8F0;
            --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 24px rgba(30, 136, 229, 0.12);
            --shadow-lg: 0 12px 36px rgba(30, 136, 229, 0.16);
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 32px;
        }
        
        * { margin: 0; padding: 0; box-sizing: border-box; }
        
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background-color: var(--bg-soft);
            color: var(--text-dark);
            line-height: 1.5;
        }
        
        .container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
        
        /* 头部 */
        .header {
            background: #fff;
            box-shadow: var(--shadow-sm);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 2px solid var(--primary-blue);
        }
        
        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        
        .logo-icon {
            width: 42px; height: 42px;
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: bold;
            font-size: 20px;
        }
        
        .logo-text {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--dark-blue);
        }
        
        .nav {
            display: flex;
            gap: 32px;
        }
        
        .nav a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 500;
            font-size: 1.05rem;
            padding: 8px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.2s;
        }
        
        .nav a:hover, .nav a.active {
            color: var(--primary-blue);
            border-bottom-color: var(--primary-blue);
        }
        
        .download-btn {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
            color: #fff !important;
            border: none;
            padding: 10px 24px !important;
            border-radius: 40px;
            font-weight: 600;
            border-bottom: none !important;
        }
        
        /* 版块样式 */
        .section {
            padding: 56px 0;
        }
        
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 40px;
            color: var(--dark-blue);
            position: relative;
            padding-bottom: 16px;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-blue), var(--accent-blue));
            border-radius: 4px;
        }
        
        .card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        
        /* 下载终端 */
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        
        .platform-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 32px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        
        .platform-icon { font-size: 48px; margin-bottom: 16px; }
        .platform-card h4 { font-size: 1.5rem; color: var(--dark-blue); margin-bottom: 8px; }
        .platform-desc { color: var(--text-soft); margin-bottom: 20px; font-size: 0.9rem; }
        .platform-btn {
            background: var(--primary-blue);
            color: #fff;
            padding: 10px 24px;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 500;
            display: inline-block;
        }
        
        /* CTA下载 */
        .cta-download {
            background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
            border-radius: var(--radius-xl);
            padding: 48px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        
        .cta-content h3 { font-size: 2rem; color: #fff; margin-bottom: 8px; }
        .cta-content p { color: rgba(255,255,255,0.9); }
        .cta-btn {
            background: #fff;
            color: var(--primary-blue) !important;
            padding: 16px 40px;
            border-radius: 60px;
            font-size: 1.2rem;
            font-weight: 600;
            text-decoration: none;
        }
        
        /* 安装指南步骤 */
        .steps-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        
        .step-item {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }
        
        .step-number {
            width: 48px; height: 48px;
            background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
            color: #fff;
            font-size: 1.5rem;
            font-weight: 700;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }
        
        /* FAQ折叠 */
        .faq-list {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 24px;
        }
        
        .faq-item {
            padding: 16px 0;
            border-bottom: 1px solid var(--border-light);
        }
        
        .faq-question {
            font-weight: 600;
            color: var(--dark-blue);
            margin-bottom: 8px;
            font-size: 1.1rem;
        }
        
        .faq-answer { color: var(--text-soft); }
        
        /* 版本升级记录 */
        .version-list {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 24px;
        }
        
        .version-item {
            padding: 16px 0;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            gap: 16px;
        }
        
        .version-tag {
            background: var(--primary-blue);
            color: #fff;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
        }
        
        .version-desc { color: var(--text-soft); }
        
        /* 导航卡片 */
        .nav-cards {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        
        .nav-card {
            background: var(--soft-blue);
            border-radius: var(--radius-lg);
            padding: 32px;
            text-align: center;
        }
        
        .nav-card a {
            color: var(--dark-blue);
            text-decoration: none;
            font-size: 1.25rem;
            font-weight: 600;
        }
        
        /* 底部 */
        .footer {
            background: #1A1A2E;
            color: #fff;
            padding: 48px 0 24px;
            margin-top: 48px;
        }
        
        .footer-about {
            max-width: 800px;
            margin-bottom: 40px;
            color: rgba(255,255,255,0.7);
            line-height: 1.8;
        }
        
        .footer-links {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
            padding: 24px 0;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        
        .footer-col h4 { color: #fff; margin-bottom: 16px; }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 10px; }
        .footer-col a { color: rgba(255,255,255,0.7); text-decoration: none; }
        .footer-col a:hover { color: #fff; }
        .copyright {
            text-align: center;
            padding-top: 32px;
            color: rgba(255,255,255,0.5);
        }
        
        @media (max-width: 768px) {
            .platform-grid, .steps-list, .nav-cards { grid-template-columns: 1fr; }
            .header-content { flex-direction: column; }
            .nav { gap: 16px; flex-wrap: wrap; justify-content: center; }
        }
    </style>