I think I've got it fixed - I didn't know capitalization was important.
I had this link in each of my chapters:
Code:
<link rel="stylesheet" href="../styles/style0001.css" type="text/css" />
The Folder/File structure in the zip file, though, was Styles/Styles0001.css.
Once I changed the case of the two S's in my link, everything worked in ADE. I'm assuming it will look right on by 505, too - I'm off to test that now.
Thanks for the help!