:root { --bg:#fbfbf9; --fg:#1d2127; --muted:#566070; --link:#1a56b0; --rule:#d9dde3; }
@media (prefers-color-scheme: dark) {
  :root { --bg:#14171c; --fg:#e6e9ee; --muted:#9aa4b2; --link:#7fb0ff; --rule:#2b313a; }
}
* { box-sizing: border-box; }
html { color-scheme: light dark; }
body { margin:0; background:var(--bg); color:var(--fg);
  font: 18px/1.65 Georgia, "Times New Roman", serif; }
main { max-width: 38rem; margin: 0 auto; padding: 3rem 1.25rem 4rem; }
h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 1rem; }
h2 { font-size: 1.2rem; margin: 2.2rem 0 .4rem; }
p, li { max-width: 38rem; }
a { color: var(--link); }
a:focus-visible { outline: 3px solid var(--link); outline-offset: 2px; }
nav { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .95rem; }