:root {
  color-scheme: light dark;
  --text: #1c1c1e;
  --muted: #6c6c70;
  --bg: #ffffff;
  --line: #e5e5ea;
  --link: #0055cc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f2f7;
    --muted: #a1a1a6;
    --bg: #1c1c1e;
    --line: #3a3a3c;
    --link: #6fa8ff;
  }
}

body {
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
  max-width: 42rem;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
  font-size: 16px;
}

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

h2 {
  font-size: 1.15rem;
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

h3 {
  font-size: 1rem;
  margin: 1.75rem 0 0.5rem;
}

p, ul {
  margin: 0.75rem 0;
}

ul {
  padding-left: 1.25rem;
}

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

nav {
  margin-bottom: 2.5rem;
  font-size: 0.9rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}