:root { --primary:#0ea5e9; --text:#0f172a; --sub:#475569; --bg:#ffffff; --muted:#64748b; --light:#f8fafc; }
*{box-sizing:border-box} body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,"PingFang SC","Noto Sans CJK",sans-serif;color:var(--text);background:var(--bg);line-height:1.6}
.container{max-width:1080px;margin:0 auto;padding:0 16px}
a{color:var(--primary);text-decoration:none} a:hover{text-decoration:underline}
.nav{position:sticky;top:0;background:#fff;border-bottom:1px solid #e2e8f0;z-index:9}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:56px}
.nav a{margin-left:16px;color:var(--text)}
.brand{display:flex;align-items:center;font-weight:700} .logo{width:28px;height:28px;margin-right:8px}
.hero{padding:64px 0;background:linear-gradient(180deg,#e0f2fe 0,#fff 100%)}
.hero h1{font-size:40px;margin:0 0 8px}
.subtitle{color:var(--sub);margin:0 0 16px}
.hero-points{padding-left:18px;margin:0 0 24px}
.btn{display:inline-block;background:var(--primary);color:#fff;padding:10px 18px;border-radius:8px}
.section{padding:56px 0}
.bg-light{background:var(--light)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:900px){.grid{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:16px}
.screens{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.screens img{width:100%;height:auto;border-radius:12px;border:1px solid #e2e8f0;background:#fff}
.hint{color:var(--muted);font-size:12px;margin-top:8px}
.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:900px){.download-grid{grid-template-columns:1fr}}
.d-card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:16px;text-align:center}
.contact{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:900px){.contact{grid-template-columns:1fr}}
.footer{border-top:1px solid #e2e8f0;background:#fff;padding:20px 0;margin-top:24px}
.footer-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.muted{color:var(--muted);font-size:12px}
.subnav{background:#fff;border-bottom:1px solid #e2e8f0}
.subnav-inner{display:flex;align-items:center;gap:16px;height:56px}
.subnav h1{font-size:20px;margin:0}
.back{color:var(--primary)}
.doc{padding:24px 0}
.doc h2{margin-top:20px}