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That's not "atrocious css", that's minified CSS. They're running their backend code through a resource compression system like JAWR to conserve bandwidth. Who cares if the CSS that's presented to you isn't pretty, it's a declarative language anyway.

It's likely that's a remnant from Normalize.css (where each hack is assigned a number and an explanation) that didn't get removed when uglifying the CSS.

It's just minified. The CSS itself isn't terrible besides a couple overly verbose things, but nothing's atrocious. I think the /* 1 */ comment might reveal an issue with the CSS minifier they're using. That's normalize.css, all the other comments are removed besides the one inside a selector.