Some bits and pieces:
<link type="text/css" rel="stylesheet" href="resources\styles\style.css">
so maybe add the type. Probably not the problem, but 'type=' does belong there.
BUT - since you reference style.css and do not give a hint as to what's in it, it could contain any sort of errors and no one reading your question could help you. It's contents are really critical !
Ultimately, especially since you have php in your webpage, is VS really a good place to work from? It's not exactly what Microsoft would want you to do. It's making you jump through hoops (with the imports statements, for example) that are not really necessary for a webpage. Try just plain vanilla to make your page, CSS, etc. and see how that works (which would point to SASS as the problem) or, with SASS truly out of the way, you can find and fix errors. All without the heavy overhead that one probably gets from the VS environment "help".