:root {
  --bg: #fafaf7;
  --fg: #222;
  --muted: #666;
  --line: #ddd;
  --accent: #2f5d62;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1b1c1c; --fg: #eee; --muted: #aaa; --line: #3a3b3b; --accent: #8fc1c6; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
}
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
header a { color: var(--fg); font-weight: bold; text-decoration: none; }
h1 { font-size: 1.6rem; line-height: 1.4; margin: 1.5rem 0 1rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.5rem; }
a { color: var(--accent); }
img.mascot { display: block; width: 160px; max-width: 50%; height: auto; margin: 1rem 0; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { width: 9em; background: rgba(127, 127, 127, 0.1); font-weight: bold; }
footer { margin-top: 3rem; padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--line); font-size: 0.9rem; color: var(--muted); }
footer a { color: var(--muted); }
footer p { margin: 0.3rem 0; }