:root{--teal:#1497C7;--teal-d:#0C6F97;--ink:#0E1726;--muted:#5C6B7C;--bg:#fff;--bg2:#F3F8FC;--line:#E7EDF3}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--teal)}
nav{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.nav-in{max-width:820px;margin:0 auto;display:flex;align-items:center;height:60px;padding:0 22px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px;letter-spacing:-.3px}
.logo img{width:28px;height:28px;border-radius:7px}
.logo .s{color:var(--teal)}
.nav-in .sp{flex:1}
.nav-in a.back{color:var(--muted);font-weight:600;font-size:15px}
.wrap{max-width:820px;margin:0 auto;padding:36px 22px 56px}
h1{font-size:30px;margin:0 0 6px;letter-spacing:-.5px}
h2{font-size:20px;margin:30px 0 8px;color:var(--ink)}
p,li{color:#34414F}
.muted{color:var(--muted);font-size:14px}
ul{padding-left:20px}
.card{background:var(--bg2);border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin-top:14px}
hr{border:none;border-top:1px solid var(--line);margin:30px 0}
footer{border-top:1px solid var(--line);background:#fff}
.foot{max-width:820px;margin:0 auto;padding:22px;display:flex;flex-wrap:wrap;gap:16px;align-items:center;color:var(--muted);font-size:14px}
.foot a{color:var(--teal);font-weight:600}
.foot .sp{flex:1}