Different CSS Styleshett and Post Template for different Category of Post

I have created a website using Dynamic Bengali Font. I change the main stylesheet.php and the dynamic fonts looks fine. But when using English, it show garbage.

Solution in my view, to use different stylesheet for different post category.

For Examp :
BENGALI NEWS —- this category use the stylesheet where bengali dynamic fonts are used.

MY TOWN : — this category use the default stylesheet.

and so on ….

This selection may be done at the time of posting.

Is there any solutions ???