* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.card {
  background: white;
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  text-align: center;
  max-width: 500px;
  width: 100%;
}

h1 {
  color: #333;
  margin-bottom: 16px;
  font-size: 2.5rem;
}

#message {
  color: #666;
  margin-bottom: 24px;
  font-size: 1.1rem;
}

#btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 12px 32px;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  font-weight: 600;
}

#btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

#btn:active {
  transform: translateY(0);
}