HTML, CSS FLex, Grid, JS

Nice work on adding JavaScript to enhance the interactivity of your component! Let's break down what you've done and discuss some potential improvements:

1. You're using DOMContentLoaded to ensure your script runs after the DOM is fully loaded. That's a good practice.

2. You've set up click listeners for both desktop and mobile versions to toggle the display of the tooltip and mobile overlay. This is a good start!

3. For the desktop version, you're toggling the tooltip visibility on click. That's working well.

4. For the mobile version, you're showing the overlay and hiding the normal footer when clicked. That's a good approach.

Here are some suggestions to improve and expand on what you've done:

1. Consider using classList.toggle() instead of directly manipulating style.display. It's often cleaner and allows for easier CSS transitions. For example:

   tooltip.classList.toggle('active');
   

   Then in your CSS, you can have:

   .tooltip {
     display: none;
   }
   .tooltip.active {
     display: block;
   }
   

2. To make the tooltip appear on first click, you could initialize its display state in JavaScript:

   tooltip.style.display = 'none';
   

3. For the mobile overlay, you might want to add functionality to close it as well:

   flexMobileOverlayButton.addEventListener('click', function() {
     footerMobileOverlay.style.display = 'none';
     flexFooterMobile.style.display = 'flex';
   });
   

4. Consider adding a click event listener to the document to close the tooltip or overlay when clicking outside:

   document.addEventListener('click', function(event) {
     if (!flexButton.contains(event.target) && !tooltip.contains(event.target)) {
       tooltip.classList.remove('active');
     }
   });
   

5. For smoother transitions, you could use CSS transitions and opacity instead of display:

   .tooltip {
     opacity: 0;
     transition: opacity 0.3s ease;
     pointer-events: none;
   }
   .tooltip.active {
     opacity: 1;
     pointer-events: auto;
   }
   

These changes should help make your interactive elements more responsive and user-friendly. Keep up the great work!