* {
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Segoe UI', sans-serif;
    background: #f2f6ff;
    margin: 0;
    padding: 0;
  }
  
  .container {
    max-width: 100%;
    margin: 0 auto;
    padding: 20px;
    background: #ffffff;
    min-height: 100vh;
  }
  
  h1 {
    text-align: center;
    color: #333;
    font-size: 24px;
    margin-bottom: 20px;
  }
  
  input[type="text"] {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 2px solid #007BFF;
    border-radius: 8px;
    margin-bottom: 15px;
  }
  
  button {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    background-color: #007BFF;
    color: white;
    cursor: pointer;
    margin-bottom: 15px;
  }
  
  button:hover {
    background-color: #0056b3;
    color: white;
  }
  
  .question-block {
    margin-bottom: 25px;
    padding: 15px;
    border-radius: 8px;
    background: #e6ecff;
    box-shadow: 0 0 5px rgba(0,0,0,0.05);
  }
  
  button.option {
    width: 100%;
    display: block;
    margin: 10px 0;
    padding: 14px;
    font-size: 16px;
    border-radius: 6px;
    border: none;
    background: #007BFF;
    color: white;
    transition: 0.2s ease;
  }
  
  button.option:hover {
    background-color: #cce0ff;
    color: #000;
  }
  
  .correct {
    background-color: #28a745 !important;
    color: white !important;
  }
  
  .wrong {
    background-color: #dc3545 !important;
    color: white !important;
  }
  
  body.centered {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
  }
  
  body.centered .container {
    width: 100%;
    max-width: 400px;
    text-align: center;
  }


  button.option {
    display: block;
    margin: 5px 0;
    padding: 10px;
    background-color: #e0e0ff;
    border: 1px solid #ccc;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.2s;
  }
  
  button.option.selected {
    background-color: #ffd700;
    color: black;
  }
  
  button.option.correct {
    background-color: #4caf50;
    color: white;
  }
  
  button.option.wrong {
    background-color: #f44336;
    color: white;
  }
  
  .submit-button {
    margin-top: 20px;
    padding: 12px 24px;
    font-size: 16px;
    background-color: royalblue;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
  }
  


.question-block {
  margin-bottom: 20px;
  padding: 15px;
  border-radius: 10px;
  background-color: #f4f4ff;
}

label {
  padding: 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.2s;
}

label:hover {
  background-color: #e0e0ff;
}

.submit-button {
  padding: 12px 24px;
  margin-top: 20px;
  font-size: 16px;
  background-color: royalblue;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
}
.option-btn {
    display: block;
    width: 100%;
    margin: 6px 0;
    padding: 12px;
    text-align: center;
    background-color: #e0e0ff;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
    color: red;
    cursor: pointer;
    transition: 0.2s;
  }
  
  .option-btn:hover {
    background-color: #d0d0ff;
  }
  
  .option-btn.selected {
    background-color: #ffd700;
    color: black;
  }
  
  .option-btn.correct {
    background-color: #4caf50 !important;
    color: white !important;
  }
  
  .option-btn.wrong {
    background-color: #f44336 !important;
    color: white !important;
  }
  
  .submit-button {
    margin-top: 20px;
    padding: 12px 24px;
    font-size: 16px;
    background-color: royalblue;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
  }



  .option-label {
    display: block;
    width: 100%;
    margin: 6px 0;
    padding: 12px;
    text-align: center;
    background-color: #e0e0ff;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
    color: red;
    cursor: pointer;
    transition: 0.2s;
  }
  
  .option-label:hover {
    background-color: #d0d0ff;
  }
  
  input[type="radio"]:checked + .option-label {
    background-color: #ffd700;
    color: black;
  }
  
  .option-label.correct {
    background-color: #4caf50 !important;
    color: white !important;
  }
  
  .option-label.wrong {
    background-color: #f44336 !important;
    color: white !important;
  }
  
  .submit-button {
    margin-top: 20px;
    padding: 12px 24px;
    font-size: 16px;
    background-color: royalblue;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
  }