:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --link: #0060df;
  --border: #e2e2e2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --fg: #e8e8e8;
    --muted: #a0a0a0;
    --link: #7ab7ff;
    --border: #33343a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Segoe UI", Roboto, sans-serif;
  line-height: 1.8;
}

.lang-switch {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 20px 0;
  text-align: right;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0;
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.1rem;
  margin-top: 2.2rem;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1rem;
  margin-top: 1.6rem;
}

ul {
  padding-left: 1.3rem;
}

li {
  margin: 0.3rem 0;
}

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

p {
  margin: 0.8rem 0;
}

.closing {
  margin-top: 2.5rem;
}