<style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Segoe UI', Roboto, sans-serif; background: #fff; color: #1e2a3a; line-height: 1.5; }
        .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
        /* header */
        header { background: #ffffff; box-shadow: 0 4px 20px rgba(0,0,0,0.02), 0 1px 0 #eef2f6; position: sticky; top: 0; z-index: 100; }
        .header-flex { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; padding: 16px 0; }
        .logo-area h1 { font-size: 1.8rem; font-weight: 700; display: flex; align-items: center; gap: 10px; color: #0077ff; }
        .logo-area i { font-size: 2rem; color: #0077ff; }
        .logo-area span { background: linear-gradient(135deg, #0077ff, #00c3ff); background-clip: text; -webkit-background-clip: text; color: transparent; }
        .nav-links { display: flex; gap: 32px; align-items: center; }
        .nav-links a { text-decoration: none; font-weight: 600; color: #1e2a3a; transition: 0.2s; }
        .nav-links a:hover, .nav-links a.active { color: #0077ff; }
        .btn-primary { background: #0077ff; color: white; border: none; padding: 12px 28px; border-radius: 40px; font-weight: 600; font-size: 1rem; cursor: pointer; display: inline-block; text-decoration: none; transition: 0.2s; }
        .btn-primary:hover { background: #0062d9; transform: translateY(-2px); }
        .btn-outline { background: transparent; border: 1.5px solid #0077ff; color: #0077ff; padding: 10px 24px; border-radius: 40px; font-weight: 600; text-decoration: none; transition: 0.2s; display: inline-block; }
        .btn-outline:hover { background: #0077ff10; }
        .section-title { font-size: 2.2rem; margin: 48px 0 32px 0; text-align: center; color: #0f2b3d; }
        .platform-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 32px; margin: 40px 0; }
        .download-card { background: #ffffff; border-radius: 32px; padding: 28px 20px; box-shadow: 0 12px 28px rgba(0,0,0,0.05); text-align: center; border: 1px solid #eef2f8; transition: all 0.2s; }
        .download-card i { font-size: 3rem; color: #0077ff; margin-bottom: 20px; }
        .download-card h3 { font-size: 1.8rem; margin: 12px 0; }
        .version { color: #5a6e7c; margin: 8px 0 16px; }
        .btn-download { background: #0077ff; color: white; padding: 10px 24px; border-radius: 40px; text-decoration: none; font-weight: 600; display: inline-block; margin-top: 12px; }
        .faq-item { background: #ffffff; border-bottom: 1px solid #e2e8f0; margin-bottom: 4px; }
        .faq-question { background: #f9fcff; padding: 18px 20px; font-weight: 700; font-size: 1.1rem; cursor: pointer; display: flex; justify-content: space-between; align-items: center; border-radius: 16px; }
        .faq-question:hover { background: #eef4fa; }
        .faq-answer { padding: 0 20px 18px 20px; display: none; color: #2d3e50; border-top: 1px dashed #e2edf7; margin-top: 4px; }
        .faq-answer.show { display: block; }
        .extra-links { display: flex; justify-content: center; gap: 32px; margin: 48px 0 32px; flex-wrap: wrap; }
        .footer { background: #0a1c2f; color: #cbd5e1; padding: 48px 0 32px; margin-top: 64px; }
        .keyword-tags { display: flex; flex-wrap: wrap; gap: 12px; margin: 20px 0; }
        .keyword-tags span { background: #1e2f44; padding: 6px 14px; border-radius: 40px; font-size: 0.85rem; color: #bbd4ff; }
        .footer-nav { display: flex; gap: 32px; flex-wrap: wrap; margin-top: 20px; }
        .footer a { color: #94a3b8; text-decoration: none; }
        @media (max-width: 800px) { .header-flex { flex-direction: column; gap: 16px; } .section-title { font-size: 1.8rem; } }
    </style>