:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --accent: #0b5cad;
  --rule: #d1d9e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9198a1;
    --accent: #4493f8;
    --rule: #30363d;
  }
}
body {
  max-width: 50rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}
h1 { font-size: 2.2rem; margin: 0 0 .25rem; }
h1 + p { color: var(--muted); }
h1:not(:first-of-type) {
  font-size: 1.4rem;
  margin-top: 2.5rem;
  padding-bottom: .3rem;
  border-bottom: 1px solid var(--rule);
}
h2 { font-size: 1.15rem; margin: 1.6rem 0 .4rem; }
h3 { font-size: 1rem; margin: 1.2rem 0 .3rem; }
a { color: var(--accent); }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }
ul { padding-left: 1.25rem; }
li { margin: .15rem 0; }
@media print {
  body { padding: 0; font-size: 11pt; }
  a { color: inherit; text-decoration: none; }
}