:root {
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6e6e73;
  --accent: #0a66c2;
  --panel: #f2f5f8;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --text: #ececef;
    --muted: #a1a1a8;
    --accent: #6cb2ff;
    --panel: #1d1f23;
  }
}

* { box-sizing: border-box; }

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

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2.5rem 16px 4rem;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 .25rem; }
h2 { font-size: 1.3rem; margin: 2.2rem 0 .5rem; }
h3 { font-size: 1.05rem; margin: 1.4rem 0 .4rem; }
.meta { color: var(--muted); margin-top: 0; }
.summary { background: var(--panel); padding: 1rem 1.2rem; border-radius: 10px; }
a { color: var(--accent); }
li { margin-bottom: .4rem; }