:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #1a1d29;
  --dim: #4a5068;
  --link: #3346b8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --text: #e8eaf4;
    --dim: #b4b9d0;
    --link: #a9b6ff;
  }
}
body {
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  margin: 0;
  padding: 32px 16px 64px;
}
main { max-width: 640px; margin: 0 auto; }
h1 { font-size: 1.8em; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.2em; margin: 32px 0 8px; }
p, li { color: var(--dim); }
a { color: var(--link); }
nav { margin-bottom: 32px; }
.updated { font-size: 0.9em; }