Twentyfourteen theme lost all formatting

Hello, I was using the twentyfourteen theme successfully until I decided to create a child theme. Got stuck, so gave up and tried to go back to the original twentyfourteen theme but now all the template’s formatting is lost (see https://www.soshiatsu.co.uk). I’ve re-installed WordPress, cleared my cache and it’s still the same. Not happening with any other themes so can only assume I’ve broken something in trying to create the Child. Can anyone help me get back to the original theme?