It might be a visual/spatial disconnect because you mention you cannot intuit color contrast or distinguish fonts or failed at how design works. CSS then would

It might be a visual/spatial disconnect because you mention you cannot intuit color contrast or distinguish fonts or failed at how design works. CSS then would have no meaning to you. Imagine asking a deaf person to describe music in notes. If it has no true meaning to you, it is nearly impossible to grasp. If this is the case, I would rely on a UI toolkit that has theme support so you can easily change between them and not care about these types of things.