:root {
  --paper: #faf7f2;
  --ink: #2f2a26;
  --ink-soft: #6b625a;
  --line: #e6ded2;
  --action: #b4543f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.9;
  -webkit-text-size-adjust: 100%;
}

.shell {
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

nav {
  border-bottom: 1px solid var(--line);
  padding: 1.25rem 0;
}

nav a {
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  font-size: 1.05rem;
}

main { padding: 2.5rem 0 4rem; }

.label {
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  margin: 0 0 0.5rem;
}

h1 {
  font-size: 1.6rem;
  margin: 0 0 0.5rem;
  line-height: 1.5;
}

h2 {
  font-size: 1.05rem;
  margin: 2.25rem 0 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

p { margin: 0 0 1rem; }

.updated {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

a { color: var(--action); }

footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 3rem;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

footer a { margin-right: 1rem; }

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1c1a18;
    --ink: #f0ebe4;
    --ink-soft: #a89e94;
    --line: #3a352f;
    --action: #e08a72;
  }
}