Lost formatting/CSS on site

http://www.zerogravitygym.com

I tried to set up a child theme so I could do some customization on my site (which has been perfectly stable for the month-plus since I built it) but when I activated it, suddenly all the formatting was gone. Not knowing what was happening, I reactivated the theme I’d been using…but when I did so there wasn’t any formatting STILL.

The theme I use is unsupported here, so I tried activating twenty twelve, just to troubleshoot. Same issue. No formatting. My page now begins with */ and then proceeds with all the unformatted content, no matter what theme I choose.

Here’s what I did today:

1) I used my FTP client to add a directory for a child theme.
2) I added a style.css file to the child theme directory.
3) I saw my theme but it was broken and missing a template.
4) I uploaded template.css to the child theme directory.
5) I realized it was supposed to be the php file, so did the silly simple thing and simply resaved my local css file as a php and replaced it in the child theme directory.
6) The child theme was available to me, so I activated it.
7) I viewed the site and the formatting was gone.
8) While troubleshooting, I reactivated my original theme, but the formatting was still gone.

What I didn’t do was modify any files in any directories other than the new child theme, with one exception. I overwrote the style.css file in my main theme, just in case it had somehow become corrupted. I’ve triple checked and the correct file is up there.