:root { color-scheme: light dark; --fg: #1c1c1e; --muted: #6e6e73; --bg: #fbfaf7; --link: #8a5a2b; }
@media (prefers-color-scheme: dark) { :root { --fg: #f2f2f7; --muted: #a1a1a6; --bg: #1c1c1e; --link: #e0b07a; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  -webkit-text-size-adjust: 100%; }
main { max-width: 40rem; margin: 0 auto; padding: 3rem 1.25rem 4rem; }
h1 { font-size: 2rem; line-height: 1.3; margin: 0 0 .5rem; }
h2 { font-size: 1.1rem; margin: 2rem 0 .5rem; }
p { margin: .5rem 0; }
.muted { color: var(--muted); }
a { color: var(--link); }
footer { margin-top: 3rem; font-size: .9rem; color: var(--muted); }
h3 { font-size: 1rem; margin: 1.25rem 0 .25rem; }
h3 .muted { font-weight: normal; font-size: .9rem; margin-left: .5rem; }
ul { margin: .5rem 0; padding-left: 1.25rem; }