/* Base Styles */
  .error-message {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: none;
  }
  
  .is-invalid {
    border-color: #dc3545 !important;
  }
  
  .form-messages {
    min-height: 50px;
    display: none;
    padding: 12px;
    border-radius: 4px;
    margin: 10px 0;
    text-align: center;
    font-weight: 600;
  }
  
  .success-message {
    background-color: #e6f7ee;
    color: #2e7d32;
    border: 1px solid #2e7d32;
  }
  
  .error-message-container {
    background-color: #ffebee;
    color: #c62828;
    border: 1px solid #c62828;
  }

  /* Media Queries for Responsive Design */
  @media (max-width: 1200px) {
    .form-group.style-border3 {
      margin-bottom: 15px;
    }
    
    .form-messages {
      padding: 10px;
      font-size: 0.95rem;
    }
  }

  @media (max-width: 992px) {
    .appointment-form .row {
      flex-direction: column;
    }
    
    .form-group.style-border3 {
      margin-bottom: 12px;
    }
    
    .error-message {
      font-size: 0.8rem;
    }
  }

  @media (max-width: 768px) {
    .form-group.style-border3 {
      padding: 8px;
    }
    
    .form-messages {
      padding: 8px;
      font-size: 0.9rem;
      min-height: 45px;
    }
    
    .error-message {
      margin-top: 0.2rem;
      font-size: 0.75rem;
    }
    
    input, select, textarea {
      font-size: 0.9rem !important;
    }
  }

  @media (max-width: 576px) {
    .form-group.style-border3 {
      padding: 6px;
    }
    
    .form-messages {
      padding: 6px;
      font-size: 0.85rem;
      min-height: 40px;
    }
    
    .error-message {
      font-size: 0.7rem;
      margin-left: 20px;
    }
    
    .form-btn button {
      padding: 8px 15px;
      font-size: 0.9rem;
    }
    
    input, select, textarea {
      padding: 8px 12px !important;
    }
  }

  @media (max-width: 400px) {
    .form-group.style-border3 {
      padding: 4px;
    }
    
    .form-messages {
      padding: 5px;
      font-size: 0.8rem;
    }
    
    .error-message {
      font-size: 0.65rem;
      margin-left: 20px;
    }
    
    .form-btn button {
      padding: 6px 12px;
      font-size: 0.85rem;
    }
  }