:root {
  --bg: #EFEAE0;
  --surface: #FBF8F2;
  --text: #22303F;
  --muted: #8A8578;
  --line: #DFDACE;
  --accent: #D4694A;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1A232E;
    --surface: #22303F;
    --text: #ECE6DA;
    --muted: #9AA3AD;
    --line: #33414F;
    --accent: #E2846A;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
               "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.9;
  font-size: 16px;
}
main { max-width: 42rem; margin: 0 auto; padding: 3rem 1.25rem 5rem; }
h1 { font-size: 1.5rem; line-height: 1.5; margin: 0 0 .25rem; text-wrap: balance; }
.lead { color: var(--muted); font-size: .9rem; margin: 0 0 2.5rem; }
h2 {
  font-size: 1.05rem; margin: 2.75rem 0 .75rem;
  padding-top: 1.5rem; border-top: 1px solid var(--line);
}
h2:first-of-type { border-top: none; padding-top: 0; }
ul { padding-left: 1.25rem; }
li { margin: .4rem 0; }
.note {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: .75rem; padding: 1rem 1.25rem; margin: 1.25rem 0;
}
a { color: var(--accent); }
footer { margin-top: 3.5rem; color: var(--muted); font-size: .85rem; }
footer a { margin-right: 1rem; }