:root {
  --bg: #fafaf8;
  --fg: #222;
  --muted: #666;
  --line: #e2e2dc;
  --accent: #2a5d8f;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --fg: #e8e8e4;
    --muted: #a0a09a;
    --line: #333;
    --accent: #8fb8e0;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
  font-size: 16px;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 1.6rem; margin: 0 0 8px; letter-spacing: .02em; }
h2 { font-size: 1.1rem; margin: 40px 0 8px; padding-bottom: 4px; border-bottom: 1px solid var(--line); }
p, li { margin: 0 0 12px; }
ul { padding-left: 1.2em; }
a { color: var(--accent); }
.lead { color: var(--muted); margin-bottom: 32px; }
footer { margin-top: 56px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
footer a { margin-right: 16px; }