:root{--pri:#165DFF;--sec:#36CFFB;--ink:#1D2939;--mute:#667085;--bd:#E4E7EC;--bg:#F9FAFB}
*{box-sizing:border-box}
body{margin:0;font-family:"Microsoft YaHei","PingFang SC",-apple-system,sans-serif;
 color:var(--ink);line-height:1.75;background:#fff}
.wrap{max-width:920px;margin:0 auto;padding:0 20px}
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
 backdrop-filter:blur(8px);border-bottom:1px solid var(--bd)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:18px;
 color:var(--pri);text-decoration:none}
.brand .dot{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--pri),var(--sec));
 color:#fff;display:grid;place-items:center;font-size:14px}
.nav a{color:var(--ink);text-decoration:none;font-size:14px}
.nav .links{display:flex;gap:18px;align-items:center}
.nav .links a:hover{color:var(--pri)}
.btn{display:inline-block;padding:9px 18px;border-radius:8px;background:var(--pri);
 color:#fff;text-decoration:none;font-weight:600;font-size:14px}
.btn.ghost{background:transparent;color:var(--pri);border:1px solid var(--pri)}
.hero{background:linear-gradient(135deg,#0B1B3D 0%,#12306e 60%,#165DFF 100%);color:#fff;
 padding:52px 0 46px}
.hero h1{margin:0 0 12px;font-size:clamp(24px,4vw,34px);line-height:1.35}
.hero p{margin:0;opacity:.92;font-size:16px;max-width:760px}
.crumb{font-size:13px;color:var(--mute);padding:16px 0 0}
.doc{padding:30px 0 60px}
.doc h2{font-size:21px;margin:38px 0 14px;padding-left:11px;
 border-left:4px solid var(--pri);line-height:1.4}
.doc h3{font-size:17px;margin:24px 0 10px;color:#101828}
.doc p{margin:12px 0;color:#344054}
.doc ul,.doc ol{margin:12px 0;padding-left:24px;color:#344054}
.doc li{margin:7px 0}
.doc code{background:#F2F4F7;padding:2px 6px;border-radius:4px;font-size:13px;
 font-family:Consolas,Monaco,monospace;color:#175CD3}
.doc table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px}
.doc th,.doc td{padding:10px 12px;border:1px solid var(--bd);text-align:left}
.doc th{background:var(--bg);font-weight:600}
.lead{font-size:16px;color:#475467;background:#F9FAFB;padding:14px 18px;
 border-radius:8px;border-left:3px solid var(--sec)}
.note{background:#EFF8FF;border:1px solid #B2DDFF;padding:13px 16px;border-radius:8px;
 margin:16px 0;font-size:14px;color:#175CD3}
.faq{border:1px solid var(--bd);border-radius:10px;overflow:hidden;margin:16px 0}
.faq details{border-bottom:1px solid var(--bd)}
.faq details:last-child{border-bottom:0}
.faq summary{padding:14px 18px;font-weight:600;cursor:pointer;background:#fff;list-style:none}
.faq summary:hover{background:var(--bg)}
.faq summary::before{content:"Q";display:inline-block;width:20px;height:20px;line-height:20px;
 text-align:center;background:var(--pri);color:#fff;border-radius:4px;font-size:12px;margin-right:10px}
.faq .ans{padding:0 18px 16px 48px;color:#475467;font-size:14px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:18px 0}
.card{border:1px solid var(--bd);border-radius:10px;padding:16px 18px;background:#fff}
.card h3{margin:0 0 8px;font-size:16px;color:var(--pri)}
.card p{margin:0;font-size:14px;color:#475467}
.rel{background:#F9FAFB;border:1px solid var(--bd);border-radius:10px;padding:18px;margin-top:30px}
.rel h3{margin:0 0 10px;font-size:15px}
.rel ul{padding-left:20px;margin:0}
.rel a{color:var(--pri);text-decoration:none}
.rel a:hover{text-decoration:underline}
footer{background:#0B1B3D;color:#fff;padding:32px 0;margin-top:0}
footer h4{margin:0 0 10px;font-size:15px;color:#fff}
footer p,footer a{color:rgba(255,255,255,.72);font-size:13px;text-decoration:none;display:block;margin:4px 0}
footer a:hover{color:#fff}
.fgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px}
.fbot{border-top:1px solid rgba(255,255,255,.14);margin-top:22px;padding-top:16px;
 font-size:12px;color:rgba(255,255,255,.55)}
@media(max-width:640px){.nav .links{display:none}.doc h2{font-size:19px}}