writing this so that i wont forget.
I'm on hyprland so everything is bare minimum. looked everywhere couldnt get the dark mode working on gtk4.
when using gtk settings (nwg-look) gtk 3 apps were turning dark properly
but couldn't get gtk4 apps to work. so i fixed it by installing xdg-desktop-portal-gtk.
sudo pacman -S xdg-desktop-portal-gtk