:root {
  --text: #1a1a1a;
  --muted: #666;
  --accent: #c0392b;
  --bg: #ffffff;
}

* {
  box-sizing: border-box;
}

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

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

h1 {
  font-size: 1.8rem;
  border-bottom: 3px solid var(--accent);
  padding-bottom: 0.5rem;
}

h2 {
  font-size: 1.2rem;
  margin-top: 2.5rem;
}

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

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

ul {
  padding-left: 1.4rem;
}

li {
  margin: 0.3rem 0;
}