:root {
  color-scheme: light dark;
  --bg: #faf7f2;
  --card: #ffffff;
  --text: #241c15;
  --muted: #6b5f54;
  --accent: #a25a2a;
  --line: rgba(36, 28, 21, 0.12);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17120e;
    --card: #211a15;
    --text: #f3ece4;
    --muted: #b7a899;
    --accent: #e0a06a;
    --line: rgba(243, 236, 228, 0.14);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 0 20px 64px;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.8;
}
.wrap { max-width: 720px; margin: 0 auto; }
header { padding: 48px 0 24px; }
h1 { font-size: 1.9rem; margin: 0 0 8px; letter-spacing: 0.01em; }
.tagline { color: var(--muted); margin: 0; }
nav { margin: 20px 0 0; display: flex; gap: 12px; flex-wrap: wrap; }
nav a {
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.95rem;
}
nav a:hover { border-color: var(--accent); }
section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px 24px 8px;
  margin: 24px 0;
}
h2 { font-size: 1.3rem; margin: 8px 0 16px; }
h3 { font-size: 1.05rem; margin: 28px 0 8px; }
p, li { color: var(--text); }
ol, ul { padding-left: 1.3em; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: 0.92rem; }
footer { color: var(--muted); font-size: 0.9rem; text-align: center; padding-top: 8px; }
hr { border: none; border-top: 1px solid var(--line); margin: 32px 0; }