:root{
  color-scheme:light dark;
  --paper:#f4f6f3;--ink:#101714;--muted:#68756f;--rule:#d8deda;--accent:#0b2a22;--panel:#fcfdfb;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
}
@media (prefers-color-scheme:dark){:root{--paper:#0c1210;--ink:#f4f6f3;--muted:#94a09a;--rule:#26332e;--accent:#6fb09b;--panel:#101714}}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased}
a{color:inherit;text-underline-offset:3px}
header{border-bottom:1px solid var(--rule)}
.nav,.page{width:min(760px,calc(100% - 40px));margin:auto}
.nav{min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{font-family:Songti SC,STSong,serif;font-size:1.18rem;font-weight:900;text-decoration:none}
.nav-links{display:flex;gap:18px;font-size:.86rem;color:var(--muted)}
main{padding:64px 0 80px}
.eyebrow{margin:0;color:var(--accent);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.73rem;letter-spacing:.12em}
h1{font-family:Songti SC,STSong,serif;font-size:clamp(2rem,8vw,3.4rem);line-height:1.15;margin:14px 0 18px}
.meta{color:var(--muted);font-size:.88rem;border-bottom:1px solid var(--rule);padding-bottom:28px}
article{padding-top:14px}
section{padding:26px 0 4px}
h2{font-size:1.14rem;margin:0 0 9px}
p,li{color:var(--muted)}
p{margin:0 0 12px}
ul{margin:8px 0 14px;padding-left:1.25rem}
.notice{background:var(--panel);border-left:3px solid var(--accent);padding:16px 18px;margin:24px 0;color:var(--ink)}
footer{border-top:1px solid var(--rule);padding:28px 0 48px;color:var(--muted);font-size:.82rem}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media(max-width:520px){.nav{align-items:flex-start;flex-direction:column;padding:14px 0}.nav-links{width:100%;justify-content:space-between}main{padding-top:44px}}