:root { color-scheme: light dark; }
body {
  font-family: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.9; margin: 0 auto; max-width: 42rem; padding: 3rem 1.25rem 6rem;
  color: #1c1c1e; background: #fff;
}
@media (prefers-color-scheme: dark) { body { color: #e6e6e6; background: #16161a; } a { color: #7cb7ff; } }
h1 { font-size: 1.5rem; margin-bottom: .25rem; }
h2 { font-size: 1.1rem; margin-top: 2.5rem; border-bottom: 1px solid #8883; padding-bottom: .3rem; }
.lead { color: #6b6b70; margin-top: 0; }
nav { margin-top: 3rem; font-size: .9rem; }
footer { margin-top: 4rem; font-size: .85rem; color: #6b6b70; }
ul { padding-left: 1.2rem; }