:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #1b1f24;
  --muted: #5b636d;
  --link: #0f6e66;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161b;
    --text: #edeff2;
    --muted: #a3abb5;
    --link: #7fd1c8;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 { font-size: 1.9rem; line-height: 1.2; margin: 0 0 0.5rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 0.5rem; }
a { color: var(--link); }
.muted { color: var(--muted); }