:root {
  --bg: #ffffff;
  --fg: #111827;
  --sub: #4b5563;
  --line: #e5e7eb;
  --accent: #2563eb;
  --cell: #f3f4f6;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --fg: #f1f5f9;
    --sub: #94a3b8;
    --line: #1e293b;
    --accent: #60a5fa;
    --cell: #1e293b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Segoe UI", sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 64px; }
header { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 32px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--fg); text-decoration: none; }
.brand img { border-radius: 10px; }
a { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 36px 0 8px; }
.meta { color: var(--sub); font-size: 14px; margin-top: 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 12px 0; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--cell); }
hr { border: 0; border-top: 1px solid var(--line); margin: 56px 0; }
ul { padding-left: 1.3em; }
.lead { font-size: 18px; color: var(--sub); }
.card { border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }