//Multiple themes

Sorry i dont know if qml can handle .css files

A structure containing all the colors codes ( seperate for night mode included in same file) in a qml file can help.. but i think other files needed to be linked to this file which is like rewriting the whole app. (eg. /theme_name/colorcode.qml ).

Night mode://
(optional) settings for font color in night mode should be available in settings to solve this problem. btw theming didnt touched the main body of the app..i.e surahs and translations font colors is not touched.