Orvis portfolio theme

I’m using the Orvis theme for my portfolio.
I’ve adapted the css and I like the way it looks and works … and I can live with the limitations.

When the site is viewed on a large monitor the text component of each portfolio post is relegated to a secondary position in a “sidebar”.

But, when viewed on a mobile device, the conditional css places the text content first, in a primary position, and the media content, the image, second.
This applies on the portfolio listing pages and the single, individual item pages.

This makes no sense to me for a visually orientated website.

Anyone got any idea how I can change the order – so the image comes first and the text second?

I’ve scoured the css and functions files but can’t seem to find out how but to no avail.

Any ideas gratefully appreciated.