:root{
  --paper:#f1ede3;
  --bg:#272725;
  --ink:#171614;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Consolas,monospace;
  --sans:"Inter Tight","Helvetica Neue",Arial,"PingFang SC","Noto Sans SC",sans-serif;
  --serif:"EB Garamond",Georgia,"Songti SC",serif;
  --pad:56px;
  --accent:#1c6b6f;
}
*{box-sizing:border-box}
html{background:var(--bg);-webkit-text-size-adjust:100%}
body{
  margin:0;min-height:100vh;background:var(--bg);color:var(--ink);
  font-family:var(--sans);display:flex;justify-content:center;
  padding:clamp(14px,3vw,54px) clamp(8px,2vw,28px);
}
.sheet{
  width:min(880px,100%);background:var(--paper);border-radius:3px;
  box-shadow:0 36px 90px -40px rgba(0,0,0,.65);
  align-self:flex-start;overflow:clip;padding-bottom:44px;
}
.topic-nav{
  position:sticky;top:0;z-index:30;
  display:flex;align-items:center;gap:14px;height:44px;
  padding:0 var(--pad);background:transparent;
  border-bottom:1px solid transparent;
  -webkit-backdrop-filter:none;backdrop-filter:none;
  transition:background-color .3s ease,border-color .3s ease,
    -webkit-backdrop-filter .3s ease,backdrop-filter .3s ease;
  font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;
  text-transform:uppercase;color:#6b6559;
  overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;
}
.topic-nav.is-scrolled{
  background:rgba(241,237,227,.72);
  border-bottom-color:rgba(23,22,20,.2);
  box-shadow:0 10px 22px -18px rgba(23,22,20,.55);
  -webkit-backdrop-filter:blur(14px) saturate(1.15);
  backdrop-filter:blur(14px) saturate(1.15);
}
.topic-nav::-webkit-scrollbar{display:none}
.topic-nav a{
  flex:0 0 auto;padding:6px 0;color:#6b6559;text-decoration:none;
  white-space:nowrap;transition:color .18s;
}
.topic-nav a:hover{color:var(--ink)}
.topic-nav a.home{color:#2f2c27}
.topic-nav a[aria-current="page"]{
  color:var(--ink);text-decoration:underline;text-underline-offset:6px;
  text-decoration-color:var(--accent);text-decoration-thickness:2px;
}
.topic-head{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px var(--pad);border-bottom:1px solid rgba(23,22,20,.16);
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:#4c473e;
}
.topic-head a{color:#2f2c27;text-decoration:none;border-bottom:1px solid rgba(23,22,20,.3)}
.topic-head a:hover{border-color:#2f2c27}
.hero{padding:38px var(--pad) 6px}
.kicker{
  display:flex;align-items:center;gap:8px;margin-bottom:14px;
  font-family:var(--mono);font-size:10px;letter-spacing:.18em;
  text-transform:uppercase;color:#4c473e;
}
.kicker::before{content:"";width:5px;height:16px;background:var(--accent);border-radius:2px}
.hero h1{
  margin:0 0 6px;font-family:var(--serif);font-weight:500;
  font-size:clamp(34px,5vw,52px);line-height:1.05;letter-spacing:-.02em;
}
.hero .en{
  margin:0 0 18px;font-family:var(--mono);font-size:10px;
  letter-spacing:.2em;text-transform:uppercase;color:#6b6559;
}
.lede{
  margin:0;max-width:600px;font-size:16px;line-height:1.75;color:#2f2c27;
}
.body{padding:14px var(--pad) 0}
.body h2{
  display:flex;align-items:baseline;gap:10px;margin:32px 0 10px;
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:#2f2c27;
}
.body h2 span{color:var(--accent);font-size:10px}
.body p{margin:0 0 12px;font-size:15px;line-height:1.75;color:#2f2c27}
.body .note{
  margin:16px 0 0;padding:12px 16px;border-left:3px solid var(--accent);
  background:rgba(23,22,20,.045);font-size:13.5px;line-height:1.7;color:#2f2c27;
}
.topic-foot{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin:40px var(--pad) 0;padding-top:16px;
  border-top:1px solid rgba(23,22,20,.16);
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;
}
.topic-foot a{color:#2f2c27;text-decoration:none}
.topic-foot a:hover{text-decoration:underline}
.topic-foot .back{color:#4c473e}
.foot-legal{
  display:flex;flex-wrap:wrap;gap:8px 18px;
  margin:14px var(--pad) 0;
  font-family:var(--mono);font-size:9px;letter-spacing:.14em;text-transform:uppercase;
}
.foot-legal a{color:#6b6559;text-decoration:none}
.foot-legal a:hover{color:#2f2c27;text-decoration:underline}
@media (max-width:760px){
  .sheet{--pad:24px}
  .hero{padding-top:28px}
  .body p{font-size:14.5px}
}

/* ---------- 正文内链：指向 Glossary 词条 ---------- */
.body a.gl{
  color:var(--accent);text-decoration:underline;
  text-decoration-thickness:1px;text-underline-offset:2px;
  text-decoration-color:color-mix(in srgb,var(--accent) 40%,transparent);
}
.body a.gl:hover{text-decoration-color:var(--accent)}