body {
  font-family: system-ui, sans-serif;
  background: #f9f9f9;
  color: #222;
  margin: 0;
  padding: 2rem;
  line-height: 1.6;
}

main {
  max-width: 800px;
  margin: auto;
}

h1, h2, h3 {
  color: #004d40;
}

a {
  color: #00796b;
  text-decoration: none;
  font-weight: bold;
}

a:hover {
  text-decoration: underline;
}

hr {
  border: none;
  border-top: 1px solid #ccc;
  margin: 2rem 0;
}