:root {
  color-scheme: light dark;
  --bg: #ffffff; --fg: #1c1f1d; --muted: #5b625e; --link: #0b6b4a; --line: #dfe3e0;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #101513; --fg: #e6ebe8; --muted: #a3ada7; --link: #63d3a4; --line: #2a322e; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.65; font-size: 1rem;
}
header, main, footer { max-width: 46rem; margin: 0 auto; padding: 1rem 1.25rem; }
header { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: baseline; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--fg); }
nav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; }
a { color: var(--link); }
h1 { font-size: 1.7rem; line-height: 1.25; margin: 1.5rem 0 1rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 .5rem; }
p, ul { margin: .6rem 0; }
ul { padding-left: 1.25rem; }
table { border-collapse: collapse; width: 100%; margin: 1rem 0; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: .5rem .75rem; text-align: left; vertical-align: top; }
footer { border-top: 1px solid var(--line); margin-top: 2rem; color: var(--muted); font-size: .9rem; }