<style>
        *{margin:0;padding:0;box-sizing:border-box}
        body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;line-height:1.6;color:#1a1a2e;background:#f5f9ff}
        .container{max-width:1200px;margin:0 auto;padding:0 20px}
        header{background:linear-gradient(135deg,#0a4da4 0%,#1e88e5 100%);box-shadow:0 4px 20px rgba(0,102,204,0.15);position:sticky;top:0;z-index:100}
        .header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 0;flex-wrap:wrap}
        .logo{display:flex;align-items:center;gap:10px;text-decoration:none}
        .logo-icon{width:40px;height:40px;background:#fff;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:bold;color:#1e88e5;box-shadow:0 4px 10px rgba(0,0,0,0.1)}
        .logo-text{font-size:24px;font-weight:700;color:#fff;letter-spacing:1px;text-shadow:0 2px 4px rgba(0,0,0,0.1)}
        nav{display:flex;gap:30px}
        nav a{color:#fff;text-decoration:none;font-size:16px;font-weight:500;padding:6px 0;border-bottom:2px solid transparent;transition:all 0.2s}
        nav a:hover{border-bottom-color:#fff}
        .btn-download{background:#fff;color:#1e88e5;padding:10px 24px;border-radius:30px;font-weight:600;text-decoration:none;transition:all 0.3s;box-shadow:0 4px 12px rgba(0,0,0,0.1)}
        .btn-download:hover{background:#f0f7ff;transform:translateY(-2px)}
        .menu-toggle{display:none;background:none;border:none;color:#fff;font-size:24px;cursor:pointer}
        @media (max-width:768px){
            .menu-toggle{display:block}
            nav{display:none;width:100%;flex-direction:column;gap:10px;padding:15px 0}
            nav.active{display:flex}
            .header-inner .btn-download{display:none}
        }
        section{padding:60px 0}
        .section-title{font-size:32px;font-weight:700;text-align:center;margin-bottom:40px;color:#0a4da4;position:relative}
        .section-title:after{content:'';display:block;width:80px;height:4px;background:linear-gradient(90deg,#1e88e5,#64b5f6);margin:15px auto 0;border-radius:2px}
        .card{background:#fff;border-radius:16px;padding:24px;box-shadow:0 8px 24px rgba(0,102,204,0.08);transition:transform 0.3s,box-shadow 0.3s}
        .card:hover{transform:translateY(-4px);box-shadow:0 12px 32px rgba(0,102,204,0.12)}
        .btn{display:inline-block;padding:12px 28px;border-radius:30px;font-weight:600;text-decoration:none;transition:all 0.3s;cursor:pointer;border:none}
        .btn-primary{background:linear-gradient(135deg,#1e88e5,#0a4da4);color:#fff;box-shadow:0 4px 12px rgba(30,136,229,0.3)}
        .btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 18px rgba(30,136,229,0.4)}
        .btn-secondary{background:#e3f2fd;color:#0a4da4;border:1px solid #bbdefb}
        .btn-secondary:hover{background:#bbdefb}
        .btn-large{padding:16px 48px;font-size:18px}
        .breadcrumb{padding:15px 0;color:#666}
        .breadcrumb a{color:#1e88e5;text-decoration:none}
        .versions-showcase{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;margin-bottom:40px}
        @media (max-width:768px){.versions-showcase{grid-template-columns:1fr}}
        .version-highlight{background:#fff;border-radius:20px;padding:40px 30px;box-shadow:0 12px 32px rgba(0,102,204,0.1);border:2px solid #e3f2fd}
        .version-highlight.featured{border-color:#1e88e5;background:linear-gradient(145deg,#fff,#f0f8ff)}
        .version-badge{display:inline-block;background:#1e88e5;color:#fff;padding:4px 16px;border-radius:20px;font-size:14px;margin-bottom:15px}
        .version-icon{font-size:56px;margin:15px 0}
        .version-desc{margin:20px 0;color:#555}
        .other-versions{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:30px}
        @media (max-width:576px){.other-versions{grid-template-columns:1fr}}
        .steps-list{list-style:none;counter-reset:step-counter;margin-top:30px}
        .steps-list li{counter-increment:step-counter;padding:20px 0 20px 60px;position:relative;border-bottom:1px solid #e0e0e0}
        .steps-list li:before{content:counter(step-counter);position:absolute;left:0;top:15px;width:40px;height:40px;background:linear-gradient(135deg,#1e88e5,#0a4da4);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px}
        .changelog{max-height:300px;overflow-y:auto;padding-right:15px}
        .changelog-item{padding:12px 0;border-bottom:1px solid #eee}
        .changelog-version{font-weight:700;color:#1e88e5;margin-right:15px}
        .nav-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:30px}
        .faq-list{max-width:900px;margin:0 auto}
        .faq-item{border-bottom:1px solid #e0e0e0}
        .faq-question{padding:18px 0;font-weight:600;color:#1a1a2e;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
        .faq-question:after{content:'▼';font-size:12px;color:#1e88e5}
        .faq-answer{padding:0 0 18px 0;color:#555;display:none}
        .faq-item.active .faq-answer{display:block}
        .faq-item.active .faq-question:after{content:'▲'}
        footer{background:#0a2540;color:#cfd8e6;padding:50px 0 20px;margin-top:40px}
        .footer-intro{max-width:800px;margin-bottom:30px;line-height:1.8}
        .footer-links{display:flex;gap:40px;flex-wrap:wrap;margin-bottom:30px}
        .footer-col h4{color:#fff;margin-bottom:15px}
        .footer-col a{color:#90a4c7;text-decoration:none;display:block;margin-bottom:8px}
        .footer-bottom{text-align:center;padding-top:20px;border-top:1px solid #2a4058}
        .download-hero{background:linear-gradient(135deg,#e8f4fd,#d4eaff);border-radius:20px;padding:50px 40px;text-align:center;margin-bottom:40px}
        .download-hero h2{font-size:42px;color:#0a4da4;margin-bottom:15px}
    </style>