:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --link: #0b5cad;
  --rule: #d8dee4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181c;
    --fg: #e6e8eb;
    --muted: #9aa4ae;
    --link: #7cb7ff;
    --rule: #30363d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.8;
}
main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 4rem;
}
h1 { font-size: 1.6rem; line-height: 1.4; margin: 0 0 1rem; }
h2 { font-size: 1.1rem; margin: 2rem 0 0.5rem; }
p, ul { margin: 0 0 0.75rem; }
ul { padding-left: 1.25rem; }
a { color: var(--link); }
.crumb { font-size: 0.9rem; margin-bottom: 0.25rem; }
.updated { color: var(--muted); font-size: 0.9rem; }
nav {
  display: flex;
  gap: 1.25rem;
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.95rem;
}