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For my solution you need to make for those pages a alias.

Then you can use {PHP.al} to get the alias.

Now you can load a CSS file with eg.

You need to make for your example 3 CCS files
alias1.css
alias2.css
alias3.css

Don't forget to load the standard css to.

Or make one CSS and make different classes for the differnt pages.
Make as example alias1 class and you can use
<div class={PHP.al}>

Try if, maybe it is not working exactly.
Maybe not the best way.

Good luck