body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.card {
  text-align: center;
  padding: 2rem;
  max-width: 512px;
  animation: fadeIn 1.5s ease;
}

button {
  margin-top: 1rem;
  padding: 0.7rem 1.4rem;
  border: none;
  border-radius: 30px;
  background: #d4af37;
  cursor: pointer;
}

.hidden {
  opacity: 0;
  transition: opacity 1s ease;
}

.show {
  opacity: 1;
}

.url {
  color: #e75757;
  text-decoration: none;
}

.message {
  margin-top: 50px;
  border: 1px solid #ffffffa8;
  padding: 15px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}