:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --link: #1a5fb4;
  --link-visited: #6a3d9a;
  --rule: #d8dee4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --fg: #e6e8eb;
    --muted: #9aa4af;
    --link: #79b0f2;
    --link-visited: #c1a0e8;
    --rule: #30363d;
  }
}
body {
  max-width: 48rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
}
a { color: var(--link); }
a:visited { color: var(--link-visited); }
img { max-width: 100%; height: auto; }
h1, h2, h3 { line-height: 1.25; }
h2 { font-weight: 500; color: var(--muted); }
h3 { margin-top: 2rem; padding-bottom: 0.25rem; border-bottom: 1px solid var(--rule); }
li { margin: 0.3rem 0; }
.header { text-align: center; }
.header img { border-radius: 50%; }