:root {
  --bg: #fafaf8;
  --fg: #1d1d1f;
  --muted: #6b6b70;
  --line: #e2e2de;
  --accent: #3b5bdb;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141417;
    --fg: #ececef;
    --muted: #a0a0a8;
    --line: #2c2c31;
    --accent: #8ea6ff;
    --card: #1c1c20;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  line-height: 1.8;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
header.site { max-width: 720px; margin: 0 auto; padding: 20px 16px 0; }
header.site a { color: var(--fg); text-decoration: none; font-weight: 700; letter-spacing: 0.02em; }
h1 { font-size: 1.8rem; line-height: 1.4; margin: 0 0 8px; }
h2 { font-size: 1.15rem; margin: 36px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
p, ul { margin: 8px 0; }
ul { padding-left: 1.4em; }
a { color: var(--accent); }
.lead { color: var(--muted); margin-bottom: 32px; }
.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  margin: 16px 0;
  color: var(--fg);
  text-decoration: none;
}
.card:hover { border-color: var(--accent); }
.card .name { font-weight: 700; font-size: 1.1rem; }
.card .desc { color: var(--muted); font-size: 0.95rem; }
nav.links { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 24px 0; }
.back { display: inline-block; margin-bottom: 24px; font-size: 0.9rem; }
footer { max-width: 720px; margin: 0 auto; padding: 24px 16px 40px; color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--line); }