/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  background: #f5f5f5;
  color: #333;
  padding: 20px;
}

header {
  background: #333;
  color: white;
  padding: 20px;
  text-align: center;
}

header nav {
  margin-top: 10px;
}

header nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}

header nav a:hover {
  text-decoration: underline;
}

main {
  padding: 20px;
  background: white;
  margin-top: 20px;
  border-radius: 8px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

footer {
  text-align: center;
  margin-top: 40px;
  font-size: 0.9em;
  color: #777;
}