:root {
  --paper: #f8f5ee;
  --ink: #2b2a27;
  --subtle: #6b675f;
  --rule: #d9d3c7;
  --action: #2f6b5e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1d1c1a;
    --ink: #ece8df;
    --subtle: #a8a296;
    --rule: #3a3833;
    --action: #7fc2b2;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.9;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 26px; line-height: 1.5; margin: 0 0 8px; }
h2 { font-size: 18px; margin: 40px 0 8px; padding-top: 16px; border-top: 1px solid var(--rule); }
p, li { margin: 8px 0; }
ul { padding-left: 1.4em; }
a { color: var(--action); }
.meta { color: var(--subtle); font-size: 14px; }
nav { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--rule); font-size: 14px; }
nav a { margin-right: 16px; }