:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --link: #0969da;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9198a1;
    --link: #4493f8;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 { font-size: 1.75rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.15rem; margin-top: 2rem; }
a { color: var(--link); }
.meta { color: var(--muted); margin-top: 0; }