:root {
  color-scheme: light dark;
  --text: #1f2328;
  --muted: #59636e;
  --line: #d1d9e0;
  --bg: #ffffff;
  --link: #0a5bbd;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6e9ec;
    --muted: #9aa5b1;
    --line: #3a424b;
    --bg: #15181c;
    --link: #79b4f7;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0 auto;
  max-width: 44rem;
  padding: 1.5rem 1rem 3rem;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  overflow-wrap: anywhere;
}
a { color: var(--link); }
h1 { font-size: 1.6rem; line-height: 1.35; margin: 1rem 0 .25rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 .5rem; }
nav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; font-size: .9rem; }
.meta { color: var(--muted); font-size: .9rem; margin: 0; }
.note { border-left: 3px solid var(--line); color: var(--muted); padding-left: .75rem; }
ul { padding-left: 1.25rem; }
dl { margin: 0; }
dt { font-weight: 600; margin-top: .75rem; }
dd { margin: 0; }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; margin-top: 2.5rem; padding-top: 1rem; }