body {
      font-family: sans-serif;
      background-color: #f3f4f6;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }
    .game-card {
      background: white;
      padding: 2rem;
      border-radius: 1rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      text-align: center;
    }
    input {
      padding: 0.5rem;
      margin: 1rem 0;
      text-align: center;
      font-size: 1rem;
      width: 100px;
    }
    button {
      padding: 0.5rem 1rem;
      font-weight: bold;
      font-size: 1rem;
    }