:root{
  --bg:#f5f5f7; --card:#fff; --ink:#1d1d1f; --ink2:#6e6e73; --line:rgba(0,0,0,.07);
  --accent:#ff9500;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#000; --card:#1c1c1e; --ink:#f5f5f7; --ink2:#98989d; --line:rgba(255,255,255,.09); }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display","Helvetica Neue","PingFang SC",sans-serif;
  font-size:17px; line-height:1.47; -webkit-font-smoothing:antialiased;
}
.wrap{max-width:720px; margin:0 auto; padding:64px 20px 96px}
header{display:flex; align-items:center; gap:18px; margin-bottom:44px}
header img{width:72px; height:72px; border-radius:17px; display:block}
header .t{font-size:24px; font-weight:600; letter-spacing:-.012em; margin:0}
header .s{font-size:15px; color:var(--ink2); margin:3px 0 0}
h1{font-size:34px; font-weight:600; letter-spacing:-.014em; margin:0 0 10px}
h1 .dim{color:var(--ink2)}
.lead{color:var(--ink2); font-size:17px; margin:0 0 36px}
section{background:var(--card); border-radius:26px; padding:28px 28px 30px; margin:0 0 18px}
section h2{font-size:20px; font-weight:600; letter-spacing:-.01em; margin:0 0 12px}
section p{margin:0 0 12px}
section p:last-child{margin-bottom:0}
ul{margin:0; padding-left:20px}
li{margin:0 0 8px}
li:last-child{margin-bottom:0}
a{color:#007aff; text-decoration:none}
a:hover{text-decoration:underline}
.meta{color:var(--ink2); font-size:14px; margin-top:28px; text-align:center}
.zh{border-top:1px solid var(--line); margin-top:30px; padding-top:26px}
.pill{display:inline-block; background:var(--bg); border:1px solid var(--line); color:var(--ink2);
  font-size:13px; padding:5px 12px; border-radius:999px; margin:0 6px 6px 0}