Header logo is blurry

Thank you for such a great theme! By far the best I’ve ever used for ecommerce.

My question is around the site identity logo. All of the other images on the site look great on high-resolution retina screens (tested on iPhone and retina MacBook Pro), but the site logo in the header is still very blurry. I’ve uploaded larger-size images, but then the issue is that these larger images don’t scale down to fit the header.

Can you recommend a way to keep the header logo clear on retina displays? I can provide a link to the site if needed. Thanks in advance!