.form-container {
      max-width: 400px;
      font-family: Arial, sans-serif;
    }
    
    .form-group {
      margin-bottom: 20px;
    }
    
    .form-group label {
      display: block;
      margin-bottom: 5px;
      font-weight: bold;
      color: #333;
    }
    
    .form-group input[type="text"],
    .form-group input[type="email"] {
      width: 100%;
      padding: 10px;
      border: 2px solid #ddd;
      border-radius: 4px;
      font-size: 14px;
      transition: border-color 0.3s ease;
    }
    
    .form-group input:focus {
      outline: none;
      border-color: #007bff;
    }
    
    .form-group input:valid {
      border-color: #28a745;
    }
    
    .form-group input:invalid:not(:placeholder-shown) {
      border-color: #dc3545;
    }
    
    .checkbox-group {
      display: flex;
      align-items: center;
      gap: 10px;
      margin: 15px 0;
    }
    
    .checkbox-group input[type="checkbox"] {
      width: 18px;
      height: 18px;
      accent-color: #007bff;
    }
    
    .submit-btn {
      background: #ccc;
      color: #666;
      padding: 12px 24px;
      border: none;
      border-radius: 4px;
      cursor: not-allowed;
      font-size: 16px;
      transition: all 0.3s ease;
    }
    
    #terms:checked ~ .submit-btn {
      background: #007bff;
      color: white;
      cursor: pointer;
    }
    
    #terms:checked ~ .submit-btn:hover {
      background: #0056b3;
    }
    
    .form-message {
      display: none;
      padding: 10px;
      margin-top: 10px;
      border-radius: 4px;
    }
    
    #terms:checked ~ .form-message {
      display: block;
      background: #d4edda;
      color: #155724;
      border: 1px solid #c3e6cb;
    }