:root {
  --bg: #ffffff;
  --fg: #1a1d21;
  --muted: #5b6570;
  --accent: #3b82f6;
  --rule: #e6e9ec;
  --card: #f7f9fb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --fg: #e7ebef;
    --muted: #9aa4ae;
    --accent: #60a5fa;
    --rule: #232a31;
    --card: #161b21;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 22px 80px;
}
.brand {
  display: inline-block;
  font-weight: 700;
  letter-spacing: .2px;
  text-decoration: none;
  color: var(--fg);
  margin-bottom: 28px;
}
.brand span { color: var(--accent); }
h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 6px;
}
h2 {
  font-size: 1.25rem;
  margin: 40px 0 10px;
  padding-top: 8px;
}
h3 { font-size: 1.05rem; margin: 26px 0 8px; }
.meta {
  color: var(--muted);
  font-size: .9rem;
  margin: 0 0 8px;
}
.lead { font-size: 1.05rem; }
hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 32px 0;
}
a { color: var(--accent); }
ul { padding-left: 1.2em; }
li { margin: 6px 0; }
strong { font-weight: 600; }
footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: .85rem;
}
footer a { margin-right: 16px; }