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

header {
  background: #005f73;
  color: #fff;
  padding: 1em;
  text-align: center;
}

header a {
  color: white;
  text-decoration: none;
}

header ul {
  list-style: none;
  padding: 0;
  margin: 0.5em 0 0 0;
  display: flex;
  justify-content: center;
  gap: 1.5em;
}

main {
  max-width: 700px;
  margin: 2em auto;
  padding: 0 1em;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

footer {
  text-align: center;
  padding: 1em;
  background: #e0e0e0;
  margin-top: 2em;
  font-size: 0.9em;
}