body{
    background:#f5f6ff;
    font-family:Arial, sans-serif;
    margin:0;
    padding:0;
    display:flex;
    justify-content:center;
    align-items:center;
    min-height:100vh;
  }
  
  .quiz-container{
    background:white;
    width:90%;
    max-width:600px;
    padding:30px;
    border-radius:12px;
    box-shadow:0 4px 20px rgba(0,0,0,0.1);
    text-align:center;
  }
  
  #question{
    font-size:18px;
    margin:20px 0;
    font-weight:600;
  }
  
  .option{
    background:#fff;
    border:1px solid #bbb;
    padding:12px;
    border-radius:8px;
    margin:10px 0;
    cursor:pointer;
    transition:.2s;
    text-align:left;
    font-family:monospace;
    white-space:pre-wrap;
  }
  
  .option:hover{
    border-color:#6e63ff;
  }
  
  .option.correct{
    border-color:#00cc52;
    background:#e7ffe7;
  }
  
  .option.wrong{
    border-color:#ff3b3b;
    background:#ffe6e6;
  }
  
  #nextBtn, #restartBtn{
    margin-top:20px;
    padding:10px 20px;
    background:#6e63ff;
    border:none;
    color:white;
    border-radius:8px;
    font-weight:bold;
    cursor:pointer;
  }
  
  #nextBtn:disabled{
    background:#ccc;
    cursor:not-allowed;
  }
  
  .hidden{
    display:none;
  }
  #feedback{
    font-weight:bold;
    margin-top:10px;
    color:#444;
  }
  .back-btn{
    background:#e5e7eb;
    border:none;
    padding:8px 14px;
    border-radius:6px;
    cursor:pointer;
    margin-bottom:10px;
    font-size:14px;
  }
  
  .back-btn:hover{
    background:#d1d5db;
  }