:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #555555;
  --accent: #0b5cad;
  --line: #dddddd;
  --card: #f6f7f9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121316;
    --fg: #ececec;
    --muted: #a8a8a8;
    --accent: #7ab7ff;
    --line: #2c2e33;
    --card: #1b1d21;
  }
}
* { 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, Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.6;
}
a { color: var(--accent); }
header, main, footer { max-width: 42rem; margin: 0 auto; padding: 1rem 1.25rem; }
header { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .5rem 1.5rem; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 1.25rem; color: var(--fg); text-decoration: none; }
nav a { margin-right: 1rem; font-size: .95rem; }
nav a:last-child { margin-right: 0; }
h1 { font-size: 2rem; line-height: 1.25; margin: 1.5rem 0 .75rem; }
h2 { font-size: 1.3rem; margin: 2rem 0 .5rem; }
p, ul, ol { margin: 0 0 1rem; }
li { margin-bottom: .35rem; }
.lead { font-size: 1.15rem; color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 1rem 1.25rem; margin: 0 0 1rem; }
.card h3 { margin: 0 0 .35rem; font-size: 1.1rem; }
.card p { margin: 0 0 .75rem; }
.button { display: inline-block; padding: .55rem 1rem; border: 1px solid var(--accent); border-radius: 6px; text-decoration: none; font-weight: 600; }
.updated { color: var(--muted); font-size: .9rem; }
footer { border-top: 1px solid var(--line); margin-top: 2rem; font-size: .9rem; color: var(--muted); }
footer p { margin: 0 0 .5rem; }
footer a { margin-right: .75rem; }
@media (max-width: 480px) { body { font-size: 17px; } h1 { font-size: 1.6rem; } }