body {
  font-family: "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #1d3557, #457b9d);
  color: white;
  text-align: center;
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
h1 {
  font-size: 3em;
  margin-bottom: 0.5em;
}
p {
  font-size: 1.2em;
  opacity: 0.9;
}
a {
  display: inline-block;
  margin-top: 1.5em;
  padding: 0.75em 1.5em;
  color: #1d3557;
  background: white;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: 0.2s ease;
}
a:hover {
  background: #f1faee;
}