:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --accent: #0f766e;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111a2b;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --border: #23314a;
    --accent: #2dd4bf;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.75;
  font-size: 16px;
}
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { background: var(--surface); border-bottom: 1px solid var(--border); }
header .wrap { padding-top: 12px; padding-bottom: 12px; }
.logo { font-weight: 800; font-size: 1.25rem; text-decoration: none; color: var(--text); }
main { padding-top: 24px; padding-bottom: 48px; }
h1 { font-size: 1.6rem; line-height: 1.35; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin: 2em 0 0.6em; }
.lead { color: var(--muted); margin-top: 0; }
.sites { list-style: none; padding: 0; margin: 16px 0; display: grid; gap: 12px; }
.sites a { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; text-decoration: none; color: var(--text); }
.sites a:hover { border-color: var(--accent); }
.sites strong { display: block; font-size: 1.1rem; color: var(--accent); }
.sites span { display: block; color: var(--muted); font-size: 0.95rem; }
dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; overflow-wrap: anywhere; }
footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; }
footer .wrap { padding-top: 16px; padding-bottom: 24px; }
footer nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }