CSS not compiling on website all of a sudden

Hi all,

I was locally developing my custom theme and all of a sudden after I saved and loaded my theme, the CSS totally broke and now my site has no styles and I am unable to restore it after trying so many things. None of the files are different from when it was working to now, and maybe there is some CSS compiling issue but I am new to this so I would really appreciate any help with this. What should I do to start troubleshooting this issue?

Here is what the site looks like now: https://thegirlwhocriedlook.ghost.io/

The css file is missing

<link rel="stylesheet" type="text/css" href="/assets/ built/screen.css?v=0e93c2e5ed" />

Are you sure you uploaded it?