How to prevent a problem in the CNC?

Question

PHP

I did it on the CNC website, and then a problem arose. I have an address mysite/post , where everything works fine, but after mysite/post/, php and css files are not included. What is the problem I can not understand.
Here is the code in .htaccess:

RewriteEngine On
    RewriteBase /mysite
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^/([0-9]+)/$ index.php?uri=$1 [L,QSA]

Thank you Vadim997

Answer 1

open the console, reload and you will see 404.
If so, then htaccess is not registered correctly.
I don’t know htaccess well, so I won’t help ((
if there is 403 then go to the place where this file is located and edit htaccess if 500 is the same, only the error arose due to incorrect htaccess.
That's what I know.

Answer 2

Links to CSS, JS, etc. should be changed from relative to absolute

Answer 3

You need to look at the source code of the page that is displayed at mysite/post/ (or where the files are not connected there). Pay attention to the css path it is trying to include. From here, dig further.