:root {
  --bg: #f7f5ef;
  --surface: #ffffff;
  --text: #22212a;
  --muted: #62606d;
  --accent: #a8322d;
  --border: #e3dfd3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15141b;
    --surface: #1e1d26;
    --text: #ecebf2;
    --muted: #a6a4b3;
    --accent: #e8c979;
    --border: #33313f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.8;
  font-size: 16px;
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}
header.site {
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
  margin-bottom: 24px;
}
header.site a.home {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}
h1 { font-size: 1.6rem; margin: 8px 0 0; line-height: 1.4; }
h2 {
  font-size: 1.1rem;
  margin: 32px 0 8px;
  padding-left: 10px;
  border-left: 4px solid var(--accent);
}
p, li { overflow-wrap: anywhere; }
ul, ol { padding-left: 1.4em; }
a { color: var(--accent); }
.muted { color: var(--muted); font-size: 14px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 16px 0;
}
nav.links { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
nav.links a {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  text-decoration: none;
  font-weight: bold;
}
footer { margin-top: 48px; color: var(--muted); font-size: 13px; text-align: center; }