:root{--night:#0D0E1A;--gold:#B9861F;--ink:#1B1D33;--muted:#666A85;--paper:#F7F6F2;--card:#FFFFFF;--line:#E6E3DA;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",Arial,sans-serif;--serif:ui-serif,"New York","Songti SC",Georgia,serif}
@media (prefers-color-scheme:dark){:root{--gold:#F5B544;--ink:#ECECF4;--muted:#A3A6C0;--paper:#0D0E1A;--card:#15172B;--line:#262A47}}
*{box-sizing:border-box}
html[data-lang="en"] [lang="zh"],html[data-lang="zh"] [lang="en"]{display:none!important}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.75 var(--sans);-webkit-font-smoothing:antialiased}
main{max-width:780px;margin:0 auto;padding:24px 16px 72px}
header{display:flex;align-items:center;gap:16px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:18px;color:var(--ink);text-decoration:none;margin-right:auto}
.brand i{font-family:var(--serif);color:var(--gold)}
nav{font-size:14px;color:var(--muted)}
nav a{color:var(--muted);text-decoration:none;margin-left:14px}
.lang-btn{border:1px solid var(--line);background:transparent;border-radius:999px;padding:5px 12px;font:600 13px var(--sans);color:var(--ink);cursor:pointer}
a{color:var(--gold)}
article{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px 24px;margin-top:24px}
.eyebrow{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin:0}
h1{font-size:clamp(30px,5vw,40px);line-height:1.2;letter-spacing:-.02em;margin:6px 0 12px}
h1 .em{font-family:var(--serif);font-style:italic;color:var(--gold)}
h2{font-size:19px;margin:30px 0 8px}
h3{font-size:16px;margin:22px 0 4px}
.lead{color:var(--muted)}
.summary{background:var(--paper);border-radius:14px;padding:14px 16px;border:1px solid var(--line)}
ul{padding-left:20px}li{margin-bottom:8px}
footer{margin-top:28px;font-size:13px;color:var(--muted);text-align:center}