* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  background: #fafafa;
  margin: 0;
  padding: 2rem;
}

main {
  max-width: 640px;
  margin: 4rem auto;
}

h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

a {
  color: #0066cc;
}