Create or update the script.js file to include validation functions.

Implement validation for the following order$\_$form fields:

first$\_$name and last$\_$name: Ensure these fields are not empty and contain only alphabetic characters.

Email Address: Validate that the input is in a proper email format.

Phone Number: Validate that the input contains only numbers and follows a standard phone number format.

Shipping$\_$address: Ensure the field is not empty.

Product Selection: Ensure a product is selected from the dropdown.

Quantity: Validate that the quantity is a positive integer greater than zero.

card$\_$type: Ensure that one of the payment methods is selected.

card$\_$number: Validate that the card number is a $16-$digit input.

Order Date: Ensure the date is selected and it is a proper date.

Use if$-$else statements to check the validity of each field.

Implement for or while loops, if necessary, to validate fields like the payment method.

Display appropriate error messages for each validation failure

Prevent form submission if any validation fails.

Use JavaScript to display error messages for invalid inputs dynamically.

Ensure error messages are removed or updated when the user corrects their input.

Highlight the invalid fields by changing the border or background color using CSS$.$

Use event listeners to validate fields in real$-$time as the user types or changes input.

Ensure that the form is only submitted when all fields are valid.

Display a summary message indicating successful form validation before submission.