:root {
  --bg: #f7f3ee;
  --surface: #fffdfa;
  --text: #3b322c;
  --muted: #85776c;
  --line: #e2d8cc;
  --primary: #a8624a;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171310;
    --surface: #26201b;
    --text: #f7efe6;
    --muted: #c9baab;
    --line: #4f453d;
    --primary: #efa487;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.8;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 20px 64px; }
header.site { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
header.site img { width: 56px; height: 56px; border-radius: 14px; }
header.site h1 { font-size: 1.5rem; margin: 0; line-height: 1.3; }
header.site p { margin: 0; color: var(--muted); font-size: 0.9rem; }
nav { display: flex; gap: 16px; flex-wrap: wrap; margin: 16px 0 28px; font-size: 0.95rem; }
a { color: var(--primary); }
h2 { font-size: 1.15rem; margin: 36px 0 8px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
h3 { font-size: 1rem; margin: 20px 0 4px; }
section.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 4px 18px 14px; margin-top: 12px; }
.button {
  display: inline-block; margin-top: 8px; padding: 10px 20px; border-radius: 999px;
  background: var(--primary); color: var(--bg); font-weight: 700; text-decoration: none;
}
.note { color: var(--muted); font-size: 0.9rem; }
.warn { border-left: 4px solid var(--primary); padding: 4px 12px; background: var(--surface); }
footer { margin-top: 48px; color: var(--muted); font-size: 0.85rem; }
ul { padding-left: 1.3em; }