:root {
  --bg: #f4f1ea;
  --surface: #ffffff;
  --text: #2b2a27;
  --muted: #76726a;
  --border: #d9d4c8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16151a;
    --surface: #201f27;
    --text: #ece9e2;
    --muted: #9b978d;
    --border: #34323c;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.8;
}
main {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}
h1 { font-size: 22px; }
h2 { font-size: 16px; margin-top: 28px; }
p, li, td { font-size: 14px; }
table { border-collapse: collapse; width: 100%; }
td, th {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
th { width: 34%; font-weight: 600; background: var(--surface); }
a { color: inherit; }
.back { font-size: 13px; color: var(--muted); text-decoration: none; }
.muted { color: var(--muted); font-size: 12px; }