:root{--brand:#0077ff;--brand-dark:#005fd1;--ink:#14294a;--muted:#63758f;--pale:#edf6ff;--line:#e1ebf6;--white:#fff;--shadow:0 16px 45px rgba(0,119,255,.11);--radius:24px}
    *{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#fff}img{max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,a{ -webkit-tap-highlight-color:transparent}.container{width:min(1160px,calc(100% - 40px));margin:auto}.skip{position:absolute;left:-9999px;top:8px;z-index:99;background:#fff;padding:8px 14px}.skip:focus{left:8px}
    .header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.9);border-bottom:1px solid rgba(225,235,246,.88);backdrop-filter:blur(16px)}.nav{height:76px;display:flex;align-items:center;justify-content:space-between;gap:30px}.logo{font-size:26px;font-weight:800;letter-spacing:-1px}.logo span{color:var(--brand)}.nav-links{display:flex;gap:30px;color:#425875;font-size:14px}.nav-links a:hover,.nav-links a:focus{color:var(--brand)}.nav-download{padding:11px 20px;border-radius:999px;background:linear-gradient(135deg,#1684ff,#006dea);color:#fff;font-weight:700;box-shadow:0 8px 22px rgba(0,119,255,.24)}
    .notice{background:#f3f8ff;color:#526984;font-size:14px}.notice .container{display:flex;align-items:center;justify-content:center;gap:9px;min-height:42px}.notice-dot{width:8px;height:8px;border-radius:50%;background:var(--brand)}
    .hero{overflow:hidden;background:radial-gradient(circle at 80% 45%,#d9ebff 0,rgba(217,235,255,0) 36%),linear-gradient(180deg,#fff 0,#f7fbff 100%)}.hero-inner{min-height:670px;display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:60px}.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 13px;border:1px solid #c9e1ff;border-radius:999px;color:var(--brand-dark);background:rgba(255,255,255,.88);font-size:13px;font-weight:700}.hero h1{font-size:clamp(42px,6vw,70px);line-height:1.12;letter-spacing:-3px;margin:24px 0}.hero h1 span{color:var(--brand)}.hero-copy{max-width:620px;color:var(--muted);font-size:18px}.download-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}.download-btn{min-width:178px;display:flex;align-items:center;gap:12px;padding:13px 20px;border:1px solid var(--brand);border-radius:14px;background:linear-gradient(135deg,#1684ff,#006dea);color:#fff;transition:.2s}.download-btn.secondary{background:#fff;color:var(--brand);border-color:#c9ddf6}.download-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.os-icon{font-size:25px;line-height:1}.download-btn small{display:block;font-size:11px;opacity:.75;line-height:1.2}.download-btn strong{display:block;font-size:16px;line-height:1.4}.safety-note{margin-top:18px;color:#7c8ca2;font-size:13px}.hero-art{position:relative;text-align:center}.hero-art:before{content:"";position:absolute;inset:8% 10%;border-radius:50%;background:rgba(0,119,255,.1);filter:blur(12px)}.hero-art img{position:relative;max-height:580px;object-fit:contain;filter:drop-shadow(0 25px 35px rgba(0,85,180,.14))}
    section{padding:100px 0}.section-head{max-width:720px;margin:0 auto 50px;text-align:center}.kicker{margin:0 0 8px;color:var(--brand-dark);font-size:14px;font-weight:800;letter-spacing:1.5px}.section-head h2{margin:0 0 14px;font-size:clamp(30px,4vw,44px);line-height:1.25;letter-spacing:-1.4px}.section-head p{margin:0;color:var(--muted)}
    .intro{padding-top:86px}.intro-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:72px;align-items:center}.intro-card{padding:42px;border-radius:var(--radius);background:linear-gradient(145deg,#e7f2ff,#f8fbff);box-shadow:var(--shadow)}.intro-card img{display:block;width:min(100%,430px);margin:auto}.intro-copy h2{font-size:38px;line-height:1.25;margin:0 0 22px}.intro-copy p{color:var(--muted);margin:0 0 16px}.trust-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:30px}.trust-item{padding:18px 12px;border:1px solid var(--line);border-radius:16px;text-align:center}.trust-item b{display:block;color:var(--brand-dark);font-size:18px}.trust-item span{color:var(--muted);font-size:13px}
    .soft{background:linear-gradient(180deg,#f7faff 0,#f3f8ff 100%)}.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.card{padding:30px;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 8px 30px rgba(0,87,185,.05);transition:.2s}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.icon{width:52px;height:52px;display:grid;place-items:center;margin-bottom:22px;border-radius:15px;background:linear-gradient(145deg,#e5f1ff,#f2f8ff);color:var(--brand-dark);font-size:24px;font-weight:800}.card h3{margin:0 0 10px;font-size:20px}.card p{margin:0;color:var(--muted);font-size:15px}
    .chains{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.chain{display:flex;align-items:center;gap:13px;padding:19px;border:1px solid var(--line);border-radius:16px;background:#fff}.chain-mark{width:40px;height:40px;display:grid;place-items:center;flex:0 0 auto;border-radius:50%;background:var(--pale);color:var(--brand-dark);font-weight:800}.chain b{display:block}.chain small{display:block;color:var(--muted)}.chain-note{margin-top:28px;text-align:center;color:var(--muted);font-size:14px}
    .faq-wrap{max-width:860px;margin:auto}.faq-item{border-bottom:1px solid var(--line)}.faq-item summary{position:relative;cursor:pointer;list-style:none;padding:23px 46px 23px 0;font-weight:700}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"+";position:absolute;right:4px;top:17px;color:var(--brand-dark);font-size:28px;font-weight:400}.faq-item[open] summary:after{content:"−"}.faq-answer{padding:0 46px 23px 0;color:var(--muted)}.faq-answer p{margin:0}
    .cta{padding:0 0 100px}.cta-box{overflow:hidden;position:relative;padding:60px;border-radius:28px;background:linear-gradient(120deg,#0077ff,#0059d6);color:#fff;box-shadow:0 22px 55px rgba(0,119,255,.2)}.cta-box:after{content:"";position:absolute;width:340px;height:340px;right:-90px;top:-140px;border-radius:50%;background:rgba(255,255,255,.15)}.cta-content{position:relative;z-index:1;max-width:640px}.cta h2{font-size:38px;line-height:1.2;margin:0 0 14px}.cta p{color:#e1efff}.cta .download-btn{background:#fff;border-color:#fff;color:var(--brand)}
    footer{padding:48px 0;background:#0b2446;color:#b9cce3}.footer-inner{display:flex;justify-content:space-between;gap:40px}.footer-brand{max-width:520px}.footer-brand .logo{color:#fff}.footer-brand .logo span{color:#6db2ff}.footer-brand p{font-size:14px}.footer-links{display:flex;gap:28px;align-items:flex-start;font-size:14px}.footer-links a:hover{color:#fff}.copyright{margin-top:28px;padding-top:20px;border-top:1px solid rgba(255,255,255,.09);font-size:12px;color:#8199b6}
    @media(max-width:900px){.nav-links{display:none}.hero-inner,.intro-grid{grid-template-columns:1fr}.hero-inner{padding:80px 0;gap:40px}.hero-copy{font-size:16px}.hero-art{order:-1}.hero-art img{max-height:360px}.card-grid{grid-template-columns:repeat(2,1fr)}.chains{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:600px){.container{width:min(100% - 28px,1160px)}.nav{height:66px}.nav-download{padding:9px 14px;font-size:13px}.notice .container{text-align:center;padding:8px 0}.hero-inner{min-height:auto;padding:55px 0}.hero-art{display:none}.hero h1{letter-spacing:-2px}.download-actions{display:grid}.download-btn{width:100%}.intro-grid{gap:30px}.intro-card{padding:28px}.trust-list,.card-grid,.chains{grid-template-columns:1fr}section{padding:72px 0}.card{padding:24px}.cta-box{padding:38px 24px}.cta h2{font-size:30px}.footer-inner{display:block}.footer-links{margin-top:25px;flex-wrap:wrap}}