body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background: linear-gradient(135deg, #1e3c72, #2a5298);
  color: #fff;
  text-align: center;
}

header {
  background: rgba(0, 0, 0, 0.3);
  padding: 20px;
}

h1 {
  margin: 0;
  color: #ffd700;
}

main {
  padding: 20px;
}

.download-btn {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 25px;
  background-color: #00c853;
  color: white;
  font-weight: bold;
  text-decoration: none;
  border-radius: 8px;
  transition: background 0.3s;
}

.download-btn:hover {
  background-color: #009624;
}

footer {
  margin-top: 40px;
  background: rgba(0, 0, 0, 0.4);
  padding: 10px;
  font-size: 14px;
}