Confused about Joomla! templates and Hika styles

Sorry for the total noob question, but I am a bit confused about how HikaShop can be styled. The HikaShop pages use very little of the Joomla! template CSS beyond the link colors and hover effects. For example, the Proceed to Checkout button appears with the style from the default atomic template even though I am using a template that has all buttons with special styling. I assume to correct this I need to modify the file in Hika admin and add the CSS classes necessary? Is that how it works? Item-by-item HikaShop style modification? Is there no other way to "import" the template CSS styles automatically or have HikaShop just "allow" itself to be overrided by my Joomla! template?

My second question is about the styles offered as a subscription on this website. Are they full Joomla! templates? Or just a collection of styling to be assigned in HikaShop admin?

I just want to make sure I have a decent understanding of how the theming works before diving in.

Forget it. I got too anxious and went ahead and purchased the HikaShop Styles. Now I have a better idea of how it works. Thanks!