{ config, lib, ... }: {
  options = {
    services = {
      picom = {
        glxBackend = lib.mkOption {
          type = lib.types.str;
          description = "the default terminal to use";
          default = "glx";
        };
      };
    };
  };
  config = {
    services.picom = lib.mkIf config.services.picom.enable {
      backend = config.services.picom.glxBackend;
      fade = true;
      opacityRules = [
        "95:class_g = 'kitty' && focused"
        "85:class_g = 'kitty' && !focused"
        "95:class_g = 'Alacritty' && focused"
        "85:class_g = 'Alacritty' && !focused"
        "85:window_type = 'dock'"
      ];
      settings = {
        blur = {
          method = "gaussian";
          size = 10;
          deviation = 5.0;
        };
        corner-radius = 6;
        rounded-corners-exclude = [
          "window_type = 'dock'"
          "window_type = 'desktop'"
        ];
      };
    };
  };
}