body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 50px;
  background: #f0f0f0;
}

button {
  font-size: 1.2rem;
  padding: 10px 20px;
  cursor: pointer;
  border: none;
  background-color: #0078d4;
  color: white;
  border-radius: 6px;
}

button:disabled {
  background-color: #999;
  cursor: not-allowed;
}

#result {
  margin-top: 30px;
  font-size: 2rem;
  min-height: 40px;
}

#loading {
  margin-top: 20px;
  font-size: 1rem;
  color: #555;
}
h1 {
  text-align: center;
}