:root{--brand:#266fe8;--brand-dark:#1e5fdd;--ink:#1f2329;--muted:#595959;--line:#e8ebf0;--bg:#f6f8fb}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#fff;line-height:1.7}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line);background:#fff}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:600;font-size:18px;color:var(--ink)}
.logo img{width:32px;height:32px;border-radius:8px}
nav a{margin-left:24px;color:var(--muted)}
.hero{background:linear-gradient(135deg,#266fe8 0%,#5b8def 60%,#7ba4f5 100%);color:#fff;padding:72px 0;box-shadow:inset 0 -24px 48px rgba(0,0,0,.08)}
.hero h1{font-size:36px;margin:0 0 12px}
.hero p{font-size:17px;margin:0 0 28px;opacity:.95}
.btn{display:inline-block;padding:10px 24px;border-radius:6px;font-weight:500}
.btn-light{background:#fff;color:var(--brand);box-shadow:0 2px 8px rgba(0,0,0,.12),inset 0 -2px 0 rgba(0,0,0,.06)}
.btn-ghost{border:1px solid rgba(255,255,255,.7);color:#fff;margin-left:12px}
.btn:hover{text-decoration:none}
section{padding:56px 0}
section.alt{background:var(--bg)}
h2{font-size:26px;margin:0 0 8px}
.sub{color:var(--muted);margin:0 0 32px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:22px;box-shadow:0 1px 3px rgba(31,35,41,.04)}
.card h3{margin:0 0 8px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:14px}
.app{display:flex;gap:40px;align-items:center;flex-wrap:wrap}
.app img{width:108px;height:108px;border-radius:24px;box-shadow:0 6px 18px rgba(38,111,232,.25)}
.app ul{margin:12px 0 20px;padding-left:20px;color:var(--muted)}
.btn-brand{background:linear-gradient(180deg,#3a7ff0,#266fe8);color:#fff;box-shadow:inset 0 1px 0 rgba(255,255,255,.25),0 2px 6px rgba(38,111,232,.3)}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:13px}
footer .links a{color:var(--muted);margin-right:18px}
footer p{margin:6px 0}
.doc{padding:40px 0 64px}
.doc h1{font-size:28px;margin:0 0 4px}
.doc .meta{color:var(--muted);font-size:13px;margin-bottom:28px}
.doc h2{font-size:19px;margin:28px 0 8px}
.doc p,.doc li{font-size:15px}
.doc table{border-collapse:collapse;width:100%;font-size:14px;margin:8px 0}
.doc th,.doc td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
.doc th{background:var(--bg)}
@media (max-width:640px){.hero{padding:48px 0}.hero h1{font-size:28px}nav a{margin-left:14px}.btn-ghost{margin:12px 0 0}}