<style>
        *{margin:0;padding:0;box-sizing:border-box;}
        body{font-family:'Segoe UI','Microsoft YaHei',sans-serif;background:#f5f7fa;color:#1e1f2a;line-height:1.6;font-size:16px;}
        a{text-decoration:none;color:inherit;}
        .container{max-width:1280px;margin:0 auto;padding:0 24px;}
        /* Header */
        .header{background:#fff;box-shadow:0 2px 12px rgba(0,0,0,0.04);position:sticky;top:0;z-index:100;}
        .header-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 0;flex-wrap:wrap;}
        .logo-area{display:flex;align-items:center;gap:12px;}
        .logo-icon{width:44px;height:44px;background:linear-gradient(135deg,#1890ff,#0066cc);border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:20px;}
        .logo-text{font-size:24px;font-weight:700;color:#1e1f2a;}
        .logo-text span{color:#1890ff;}
        .nav-menu{display:flex;gap:36px;font-size:18px;font-weight:500;}
        .nav-menu a:hover{color:#1890ff;}
        .btn-download-sm{background:#1890ff;color:#fff;padding:10px 24px;border-radius:30px;font-weight:600;font-size:16px;}
        .menu-toggle{display:none;font-size:28px;cursor:pointer;}
        .section{padding:72px 0;}
        .section-title{font-size:36px;font-weight:700;text-align:center;margin-bottom:16px;}
        .section-subtitle{font-size:18px;text-align:center;color:#666;margin-bottom:48px;}
        .intro-text{font-size:18px;max-width:900px;margin:0 auto 48px;text-align:center;color:#444;line-height:1.9;}
        .platform-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-bottom:48px;}
        .platform-card{background:#fff;border-radius:20px;padding:40px 24px;box-shadow:0 4px 20px rgba(0,0,0,0.04);text-align:center;}
        .platform-icon{font-size:56px;margin-bottom:20px;}
        .platform-card h4{font-size:26px;font-weight:700;margin-bottom:12px;}
        .version-info{color:#666;margin-bottom:16px;font-size:16px;}
        .platform-desc{color:#666;margin-bottom:24px;font-size:16px;}
        .btn-platform{background:#1890ff;color:#fff;padding:14px 32px;border-radius:30px;font-weight:600;display:inline-block;font-size:17px;}
        .faq-list{max-width:900px;margin:0 auto;}
        .faq-item{border-bottom:1px solid #e0e0e0;}
        .faq-question{padding:20px 0;font-size:18px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;}
        .faq-question:hover{color:#1890ff;}
        .faq-answer{padding:0 0 20px 0;color:#555;font-size:16px;display:none;}
        .faq-item.active .faq-answer{display:block;}
        .steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
        .step-card{background:#fff;border-radius:20px;padding:28px 20px;box-shadow:0 4px 20px rgba(0,0,0,0.04);text-align:center;}
        .step-num{width:52px;height:52px;background:#1890ff;color:#fff;border-radius:52px;display:flex;align-items:center;justify-content:center;font-size:26px;font-weight:800;margin:0 auto 20px;}
        .cta-box{background:linear-gradient(135deg,#1890ff,#0066cc);border-radius:28px;padding:56px 40px;text-align:center;color:#fff;margin-bottom:48px;}
        .cta-box h3{font-size:36px;font-weight:700;margin-bottom:20px;}
        .btn-white{background:#fff;color:#1890ff;padding:16px 48px;border-radius:40px;font-weight:700;font-size:18px;display:inline-block;}
        .nav-links{display:flex;justify-content:center;gap:40px;margin-top:48px;}
        .nav-links a{background:#fff;padding:16px 40px;border-radius:40px;font-weight:600;font-size:18px;box-shadow:0 4px 16px rgba(0,0,0,0.04);}
        .footer{background:#1e1f2a;color:#fff;padding:48px 0 28px;}
        .footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:36px;margin-bottom:40px;}
        .footer-col h5{font-size:20px;margin-bottom:20px;}
        .footer-col ul{list-style:none;}
        .footer-col li{margin-bottom:12px;font-size:16px;opacity:0.8;}
        .footer-bottom{text-align:center;padding-top:28px;border-top:1px solid rgba(255,255,255,0.1);opacity:0.7;font-size:14px;}
        @media (max-width:768px){
            .nav-menu{display:none;width:100%;flex-direction:column;gap:16px;padding:20px 0;}
            .nav-menu.active{display:flex;}
            .menu-toggle{display:block;}
            .platform-grid{grid-template-columns:1fr;}
            .steps-grid{grid-template-columns:1fr;}
            .footer-grid{grid-template-columns:1fr;}
        }
    </style>