:root {
  --bg: #ffffff;
  --fg: #1c1d21;
  --muted: #5d6170;
  --rule: #e3e5ea;
  --accent: #3554d1;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121317;
    --fg: #e8e9ed;
    --muted: #a0a4b2;
    --rule: #2a2c33;
    --accent: #8ea4ff;
  }
}

* { box-sizing: border-box; }

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

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 1rem 4rem;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.25rem; }
h2 { font-size: 1.25rem; margin: 2.25rem 0 0.5rem; }
p, ul { margin: 0 0 1rem; }
li { margin-bottom: 0.4rem; }
a { color: var(--accent); }

.meta { color: var(--muted); margin-bottom: 2rem; }

.summary {
  border-left: 3px solid var(--accent);
  padding: 0.25rem 0 0.25rem 1rem;
  margin: 1.5rem 0 2rem;
}

footer {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}