:root{
  --bg:#fbfbfa; --fg:#1a1a18; --muted:#6b6b66; --line:#e6e6e2;
  --card:#ffffff; --accent:#2f6f4e; --accent-soft:#eaf3ee; --code-bg:#f5f5f2;
  --kw:#8250df; --str:#0a7b5e; --num:#b5551d; --com:#8b8b85; --fn:#1f5aa8;
  --warn-bg:#fdf6e3; --warn-line:#c9a227;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#141513; --fg:#e8e8e4; --muted:#9a9a93; --line:#2a2c28;
  --card:#1b1d1a; --accent:#7fc0a0; --accent-soft:#1e2a24; --code-bg:#1c1e1b;
  --kw:#c39bf5; --str:#7fd3b0; --num:#e0a06a; --com:#7d7d76; --fn:#7fb0e8;
  --warn-bg:#2a2410; --warn-line:#c9a227;
}}
:root[data-theme="dark"]{
  --bg:#141513; --fg:#e8e8e4; --muted:#9a9a93; --line:#2a2c28;
  --card:#1b1d1a; --accent:#7fc0a0; --accent-soft:#1e2a24; --code-bg:#1c1e1b;
  --kw:#c39bf5; --str:#7fd3b0; --num:#e0a06a; --com:#7d7d76; --fn:#7fb0e8;
  --warn-bg:#2a2410; --warn-line:#c9a227;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);
  font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.layout{display:flex;gap:0;min-height:100vh;max-width:1180px;margin:0 auto}
nav.side{width:238px;flex:0 0 238px;border-right:1px solid var(--line);padding:30px 20px 60px;
  position:sticky;top:0;height:100vh;overflow-y:auto}
nav.side .brand{font-weight:650;font-size:15px;margin-bottom:4px;display:block;color:var(--fg)}
nav.side .sub{font-size:12px;color:var(--muted);margin-bottom:26px}
nav.side .grp{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);
  margin:22px 0 8px;font-weight:650}
nav.side ul{list-style:none;padding:0;margin:0}
nav.side li{margin:0}
nav.side li a{display:block;padding:6px 10px;border-radius:6px;font-size:14.5px;color:var(--muted)}
nav.side li a:hover{background:var(--card);color:var(--fg);text-decoration:none}
nav.side li a.on{background:var(--accent-soft);color:var(--accent);font-weight:600}
main{flex:1;min-width:0;padding:44px 40px 100px}
.crumb{font-size:13px;color:var(--muted);margin-bottom:10px}
h1{font-size:32px;line-height:1.2;margin:0 0 12px;letter-spacing:-.02em;font-weight:650}
.lede{font-size:17.5px;color:var(--muted);margin:0 0 36px;max-width:64ch}
h2{font-size:22px;margin:48px 0 14px;font-weight:640;letter-spacing:-.01em;
  padding-top:14px;border-top:1px solid var(--line)}
h3{font-size:17px;margin:30px 0 8px;font-weight:640}
p{margin:0 0 15px;max-width:68ch}
ul,ol{max-width:68ch;padding-left:22px}
li{margin-bottom:7px}
code{background:var(--code-bg);padding:2px 6px;border-radius:4px;font-size:.88em;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Cascadia Mono",monospace}
pre{background:var(--code-bg);border:1px solid var(--line);border-radius:8px;
  padding:16px 18px;overflow-x:auto;margin:0 0 18px;font-size:13.5px;line-height:1.65}
pre code{background:none;padding:0;font-size:inherit}
.k{color:var(--kw)} .s{color:var(--str)} .n{color:var(--num)} .c{color:var(--com);font-style:italic} .f{color:var(--fn)}
.tw{overflow-x:auto;margin:0 0 20px}
table{border-collapse:collapse;width:100%;font-size:14.5px;min-width:440px}
th,td{text-align:left;padding:9px 16px 9px 0;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.07em;font-weight:650}
td code{white-space:nowrap}
.note,.warn{border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--card);
  border-radius:6px;padding:14px 18px;margin:0 0 20px;font-size:15px;color:var(--muted);max-width:68ch}
.note strong,.warn strong{color:var(--fg)}
.warn{border-left-color:var(--warn-line);background:var(--warn-bg)}
.sig{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;
  background:var(--code-bg);border:1px solid var(--line);border-radius:6px;padding:8px 12px;
  margin:0 0 10px;display:block;overflow-x:auto}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:64px;
  padding-top:22px;border-top:1px solid var(--line);font-size:14.5px}
.pager span{color:var(--muted)}
footer{margin-top:40px;font-size:13px;color:var(--muted)}
@media(max-width:880px){
  .layout{flex-direction:column}
  nav.side{width:auto;flex:none;position:static;height:auto;border-right:none;
    border-bottom:1px solid var(--line);padding:20px}
  nav.side ul{display:flex;flex-wrap:wrap;gap:4px}
  nav.side .grp{width:100%;margin:14px 0 4px}
  main{padding:28px 20px 70px}
}