:root {
  --bg: #fbfbfa;
  --fg: #1d1f21;
  --muted: #5a5f66;
  --line: #e2e3e1;
  --accent: #1f5fae;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141517;
    --fg: #e7e8e9;
    --muted: #a3a8ae;
    --line: #2c2f33;
    --accent: #7fb0ec;
    --card: #1b1d20;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
}
.wrap { max-width: 44rem; margin: 0 auto; padding: 0 16px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .5rem 1.5rem; padding-top: 1rem; padding-bottom: 1rem; }
.brand { font-weight: 650; color: var(--fg); text-decoration: none; }
nav a { margin-left: 1rem; }
nav a:first-child { margin-left: 0; }
a { color: var(--accent); }
main { padding: 2rem 0 3rem; }
h1 { font-size: 1.75rem; line-height: 1.25; margin: 0 0 .5rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; }
.lead { color: var(--muted); font-size: 1.05rem; margin-top: 0; }
.meta { color: var(--muted); font-size: .9rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 1rem 1.25rem; margin: 1.5rem 0; }
ul, ol { padding-left: 1.25rem; }
li { margin: .25rem 0; }
code { font-size: .92em; }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
footer .wrap { padding-top: 1rem; padding-bottom: 2rem; }
footer a { margin-right: 1rem; }