:root {
  --text: #1f2933;
  --muted: #52606d;
  --link: #1d5fbf;
  --bg: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #e4e7eb;
    --muted: #9aa5b1;
    --link: #7cb4ff;
    --bg: #12161c;
  }
}
body {
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
  margin: 0 auto;
  max-width: 40rem;
  padding: 3rem 1rem;
}
a { color: var(--link); }
h1 { font-size: 1.8rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.2rem; margin-top: 2rem; }
.meta { color: var(--muted); margin-top: 0; }
footer { color: var(--muted); font-size: 0.9rem; margin-top: 3rem; }