:root { color-scheme: light dark; --fg:#1a1a1a; --bg:#fdfdfc; --muted:#6b6b68; --rule:#e2e2df; --link:#0b5fff; --card:#f6f6f4; }
@media (prefers-color-scheme: dark) {
  :root { --fg:#e8e8e6; --bg:#16171a; --muted:#9a9a97; --rule:#33353a; --link:#7aa7ff; --card:#1e2024; }
}
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg);
       font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","Microsoft YaHei",sans-serif; }
main { max-width: 46rem; margin: 0 auto; padding: 3.5rem 1.5rem 5rem; }
h1 { font-size: 1.65rem; margin: 0 0 .3rem; letter-spacing: -.01em; }
h2 { font-size: 1.05rem; margin: 2rem 0 .5rem; }
p { margin: .55rem 0; }
ul { margin: .55rem 0; padding-left: 1.3rem; }
li { margin: .3rem 0; }
.updated { color: var(--muted); font-size: .9rem; margin-bottom: 2rem; }
.lead { font-size: 1.05rem; color: var(--muted); margin-bottom: 2rem; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 8px; padding: 1rem 1.25rem; margin: 1.25rem 0; }
.card p { margin: .3rem 0; }
code { font-family: ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size: .9em;
       background: var(--card); padding: .1em .35em; border-radius: 4px; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 3.5rem 0 2.5rem; }
a { color: var(--link); }
footer { margin-top: 3.5rem; padding-top: 1rem; border-top: 1px solid var(--rule);
         color: var(--muted); font-size: .875rem; }
footer a { color: var(--muted); }