body {
  font-family: system-ui, sans-serif;
  background: #f8fafc;
  color: #111827;
  margin: 0;
  padding: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}
main {
  max-width: 600px;
  text-align: center;
}
ul {
  list-style: none;
  padding: 0;
}
li {
  margin: 0.8rem 0;
}
a {
  background: #0ea5e9;
  color: #fff;
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  display: inline-block;
  transition: background 0.2s;
}
a:hover {
  background: #0284c7;
}
footer {
  margin-top: 2rem;
  font-size: 0.9rem;
  color: #475569;
}