Hi, podz, dawg – thanks for tipping me off. It was actually a really moronic mistake – sorry for the trouble, and thanks for tipping me off. I had just downloaded a new-to-me ftp program (CoffeeCup Free FTP), and had the transfer set to auto. Apparently its auto setting was not quite right. When I went through and transferred style.css as ascii manually, it, of course, worked perfectly.
Thanks for your time – hope this helps someone else. Back to my knitting.