:root {
  --bg: #fbfaf7;
  --fg: #1f1f1d;
  --muted: #6b6a66;
  --accent: #2f6f4e;
  --line: #e6e3dc;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --fg: #ececea;
    --muted: #a0a09b;
    --accent: #7fc8a0;
    --line: #2b2f34;
    --card: #1d2024;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 48px 16px 80px; }
header.site { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 48px; }
header.site a { color: var(--fg); text-decoration: none; }
header.site .brand { font-weight: 700; letter-spacing: 0.02em; }
header.site nav a { color: var(--muted); margin-left: 16px; font-size: 14px; }
h1 { font-size: 32px; line-height: 1.3; margin: 0 0 12px; }
h2 { font-size: 20px; margin: 40px 0 12px; }
p.lead { color: var(--muted); font-size: 17px; margin: 0 0 32px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px 24px; margin: 16px 0; }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
dl { margin: 0; }
dl div { display: grid; grid-template-columns: 180px 1fr; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }
dl dt { color: var(--muted); font-size: 14px; }
dl dd { margin: 0; }
@media (max-width: 560px) { dl div { grid-template-columns: 1fr; gap: 2px; } }
footer.site { margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
footer.site a { color: var(--muted); margin-right: 16px; }
.tag { display: inline-block; font-weight: 400; font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 1px 10px; margin-left: 6px; vertical-align: middle; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stats div { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.stats strong { display: block; font-size: 28px; line-height: 1.2; }
.stats span { color: var(--muted); font-size: 13px; }
@media (max-width: 560px) { .stats { grid-template-columns: 1fr; } header.site { flex-wrap: wrap; } }
p.note { color: var(--muted); font-size: 14px; }
article h2 { margin-top: 32px; }