Styles will not connect to the site, what should I do?

Question

css

Greetings to all, the crux of the problem is this. I have a ready-made site that I wrote a long time ago, with an engine and a ready-made layout, I decided to put a different template on it, but for some reason the styles would not connect. The paths are all correct 100%, I work through PhpStorm, it is highlighted there even if it is not correct, and I checked it myself several times. On the old layout, everything works fine, but as soon as you change the main page and go in, everything doesn’t work. Browser says this