:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.8; margin: 0; padding: 0 20px; color: #1a1a1a; background: #fbfbfa;
  max-width: 760px; margin-inline: auto;
}
@media (prefers-color-scheme: dark) { body { color: #e6e6e6; background: #17181a; } }
header { padding: 28px 0 10px; border-bottom: 1px solid color-mix(in srgb, currentColor 15%, transparent); }
.brand { font-size: 22px; font-weight: 700; letter-spacing: .02em; text-decoration: none; color: inherit; }
.tagline { opacity: .7; font-size: 14px; margin-top: 2px; }
nav { margin-top: 12px; display: flex; gap: 16px; flex-wrap: wrap; font-size: 14px; }
nav a { color: #2b6cb0; text-decoration: none; }
main { padding: 20px 0 60px; }
h1 { font-size: 20px; margin: 20px 0 10px; }
h2 { font-size: 15px; margin: 22px 0 6px; }
table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 14px; }
th, td { border: 1px solid color-mix(in srgb, currentColor 20%, transparent); padding: 8px 10px; text-align: left; vertical-align: top; }
th { width: 34%; background: color-mix(in srgb, currentColor 6%, transparent); white-space: nowrap; }
.blank { color: #c05621; font-weight: 600; }
.note { font-size: 13px; opacity: .8; background: color-mix(in srgb, currentColor 6%, transparent); padding: 10px 12px; border-radius: 6px; }
footer { border-top: 1px solid color-mix(in srgb, currentColor 15%, transparent); padding: 16px 0 40px; font-size: 13px; opacity: .7; }
a { color: #2b6cb0; }