Split Navigation Menu Custom CSS Changed Logo Link

Site URL: https://grape-deer-e7d9.squarespace.com/

Hey forum - 

Novice CSS user here, and this forum has been a lifesaver for learning new tricks! Hoping someone can help me puzzle through an issue that's come up - 

I used custom CSS to split my navigation menu on either side of a centered logo. However, it has had the unintended consequence of messing up the link on the logo that would normally lead back to the home page. For some reason, the link is only present & clickable at the top of the screen, around the top half of the logo. Can someone help me troubleshoot and figure out what's wrong with my code, or what I need to change?

Below is the custom CSS code I used for the navigation menu:

/*Make split navigation*/
.header-nav {
    position: absolute;
    top: 65px;
    bottom: 0;
    margin-top: 0!important;
    margin-left: 0!important;
}

.header-nav-item:nth-of-type(3) {
    margin-right: 300px!important;
}

.header-title-logo a {
    z-index: 9999;
    position: relative;
}
 

The site is in progress and unpublished.

Temporary URL is https://grape-deer-e7d9.squarespace.com/ 

Password is "roxy"

Thanks in advance! 

-Kristina

If you use a Business Plan or higher, you can remove your CSS code, then we will give CSS & JavaScript code to add split navigation. I think it will be better