* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
  }
  
  .container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
  }
  
  .hidden {
    display: none;
  }
  
  #survey-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
  }
  
  .survey-header {
    text-align: center;
    margin-bottom: 30px;
  }
  
  .survey-header h1 {
    color: #2c3e50;
    margin-bottom: 10px;
  }
  
  .survey-header p {
    color: #7f8c8d;
  }
  
  .question-container {
    margin-bottom: 30px;
    padding: 15px;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
  }
  
  .question-container h3 {
    margin-bottom: 15px;
    color: #2c3e50;
  }
  
  .image-container {
    margin: 15px 0;
    text-align: center;
  }
  
  .image-container img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  }
  
  .options {
    margin-top: 15px;
  }
  
  .option-item {
    margin: 10px 0;
  }
  
  .option-item label {
    margin-left: 8px;
    cursor: pointer;
  }
  
  button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  button:hover {
    background-color: #2980b9;
  }
  
  button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
  }
  
  #submit-btn {
    display: block;
    margin: 20px auto;
    width: 200px;
  }
  
  #thank-you {
    text-align: center;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 40px 20px;
  }
  
  #thank-you h2 {
    color: #27ae60;
    margin-bottom: 15px;
  }
  
  #restart-btn {
    margin-top: 20px;
    background-color: #27ae60;
  }
  
  #restart-btn:hover {
    background-color: #219653;
  }
  
  #loading {
    text-align: center;
    padding: 40px;
    font-size: 18px;
    color: #7f8c8d;
  }