:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --accent: #3aa96b;
  --card: #f6f8f6;
  --border: #e3e6e3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111311;
    --fg: #f2f2f0;
    --muted: #a0a0a5;
    --accent: #5fd18f;
    --card: #1b1e1b;
    --border: #2a2e2a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 40px 20px 80px; }
header.site { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
header.site .logo { font-size: 22px; font-weight: 800; color: var(--accent); letter-spacing: -0.02em; }
h1 { font-size: 1.7rem; line-height: 1.3; margin: 24px 0 4px; }
h2 { font-size: 1.15rem; margin: 36px 0 8px; padding-top: 8px; }
p, li { color: var(--fg); }
a { color: var(--accent); }
.muted { color: var(--muted); font-size: 0.9rem; }
.updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 8px; }
ul { padding-left: 1.2em; }
li { margin: 4px 0; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 20px 0;
}
nav.crumbs { margin-bottom: 28px; font-size: 0.9rem; }
nav.crumbs a { text-decoration: none; }
footer.site { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; }
.home-links { list-style: none; padding: 0; }
.home-links li { margin: 12px 0; }
.home-links a {
  display: block; padding: 16px 20px; background: var(--card);
  border: 1px solid var(--border); border-radius: 14px; text-decoration: none;
  color: var(--fg); font-weight: 600;
}
.home-links a span { display: block; color: var(--muted); font-weight: 400; font-size: 0.9rem; margin-top: 2px; }