body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: #f8f9fa;
  color: #222;
  line-height: 1.6;
}

main {
  max-width: 720px;
  padding: 1rem;
  margin: auto;
  background: #fff;
}

h1, h2, h3 {
  color: #111;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  margin: 0.5em 0;
}

a {
  color: #007bff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}