:root{
  --bg:#f6f8fb; --card:#fff; --ink:#1c2433; --muted:#6b7688; --line:#e6ebf2;
  --brand:#2f6bff; --brand-d:#1f4fd1; --accent:#0fb5a6; --warn:#e8a33d; --danger:#e05656;
  --shadow:0 2px 14px rgba(31,50,90,.07); --radius:14px;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"PingFang SC","Microsoft YaHei",Segoe UI,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6}
a{color:var(--brand);text-decoration:none}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:10px 18px;border-radius:10px;
  font-weight:600;border:none;cursor:pointer;transition:.15s}
.btn:hover{background:var(--brand-d)}
.btn.ghost{background:#eef3ff;color:var(--brand-d)}
.btn.ghost:hover{background:#e2ebff}
.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;gap:24px;height:62px}
.brand{display:flex;flex-direction:column;line-height:1.1}
.brand b{font-size:19px}.brand span{font-size:11px;color:var(--muted)}
.nav{display:flex;gap:20px;flex:1}
.nav a{color:var(--ink);font-weight:500}.nav a.cur{color:var(--brand)}
.nav-right{display:flex;gap:10px;align-items:center}
main.wrap{min-height:70vh;padding-top:30px;padding-bottom:50px}
.foot{border-top:1px solid var(--line);background:#fff;color:var(--muted);font-size:13px}
.foot .wrap{display:flex;justify-content:space-between;padding:18px 20px;flex-wrap:wrap;gap:8px}
.muted{color:var(--muted)}
/* hero */
.hero{padding:48px 0 30px;text-align:center}
.hero h1{font-size:38px;margin:0 0 12px}
.hero .lead{font-size:17px;color:var(--muted);max-width:680px;margin:0 auto 22px}
.cta{display:flex;gap:12px;justify-content:center}
.band{padding:26px 0}
.band h2{font-size:24px;margin:0 0 18px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.api-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;
  box-shadow:var(--shadow);display:flex;flex-direction:column;gap:8px}
.api-card h3{margin:0;font-size:17px}
.api-card p{margin:0;color:var(--muted);font-size:14px;min-height:40px}
.api-card .price{font-size:22px;font-weight:700;color:var(--brand)}
.api-card .price span{font-size:13px;color:var(--muted);font-weight:400}
.api-card .btn{margin-top:6px;text-align:center}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;padding-left:0;list-style:none;counter-reset:s}
.steps li{counter-increment:s;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 16px 16px 46px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:14px;top:16px;width:22px;height:22px;
  background:var(--brand);color:#fff;border-radius:50%;text-align:center;font-size:13px;line-height:22px}
/* auth */
.auth{display:flex;justify-content:center;padding:30px 0}
.auth-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  width:380px;max-width:100%;padding:24px}
.tabs{display:flex;gap:8px;margin-bottom:16px}
.tabs button{flex:1;padding:10px;border:1px solid var(--line);background:#fff;border-radius:9px;cursor:pointer;font-weight:600}
.tabs button.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.auth-card form{display:flex;flex-direction:column;gap:10px}
.auth-card input,.auth-card select{padding:11px 12px;border:1px solid var(--line);border-radius:9px;font-size:14px}
.auth-card .hide{display:none}
.auth-card .msg{color:var(--danger);font-size:13px;min-height:16px;margin:2px 0 0}
/* dashboard */
.dash h2{font-size:22px;margin:0 0 14px}
.stat{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;margin:16px 0 22px}
.stat div{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.stat b{display:block;font-size:26px;color:var(--brand)}
.stat span{font-size:13px;color:var(--muted)}
.dash-nav{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.dash-nav a{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:9px 14px;font-weight:500}
.dash-nav a:hover{border-color:var(--brand);color:var(--brand)}
.tbl{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.tbl th,.tbl td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
.tbl th{background:#f3f6fc;color:var(--muted);font-weight:600}
.opts{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.opts span{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 18px;font-weight:600;cursor:pointer}
.opts span.on{border-color:var(--brand);color:var(--brand);background:#eef3ff}
.doc-sec{margin-bottom:26px}
.doc-item{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;margin-bottom:12px}
.doc-item h3{margin:0 0 6px;font-size:16px}
.doc-item code{background:#eef3ff;color:var(--brand-d);padding:2px 7px;border-radius:6px;font-size:13px}
.doc-item pre{background:#0f1830;color:#cfe1ff;padding:12px;border-radius:9px;overflow:auto;font-size:13px}
@media(max-width:680px){
  .nav{display:none}.hero h1{font-size:28px}.stat div b{font-size:22px}
  .topbar .wrap{gap:12px}.brand span{display:none}
}