body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(to bottom right, #3498db, #2c3e50);
  }
  
  .container {
    text-align: center;
  }
  
  .board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    gap: 5px;
    margin: 20px;
  }
  
  .cell {
    width: 100px;
    height: 100px;
    border: 2px solid #333;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    cursor: pointer;
    background-color: #ecf0f1;
  }
  
  #message {
    font-size: 18px;
    margin: 10px 0;
    color: #fff;
  }
  
  #resetBtn {
    padding: 10px;
    font-size: 16px;
    cursor: pointer;
    background-color: #2ecc71;
    color: #fff;
    border: none;
  }
  
  .result-screen {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    justify-content: center;
    align-items: center;
  }
  
  .result-content {
    background: #fff;
    padding: 20px;
    border-radius: 5px;
    text-align: center;
  }
  
  #resultText {
    font-size: 20px;
    margin-bottom: 20px;
  }
  
  #playAgainBtn {
    padding: 10px;
    font-size: 16px;
    cursor: pointer;
    background-color: #3498db;
    color: #fff;
    border: none;
  }