body {
    font-family: sans-serif;
    text-align: center;
    padding: 30px;
    background: #f0f0f0;
  }
  .game-container {
    background: white;
    padding: 30px;
    border-radius: 12px;
    max-width: 400px;
    margin: auto;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
  }
  input, button {
    padding: 10px;
    font-size: 16px;
    margin-top: 10px;
  }
  #resultText {
    margin-top: 20px;
    font-size: 18px;
  }