{
  den.aspects = {
    desktop = {
      nixos =
        { pkgs, ... }:
        {
          environment.systemPackages = [
            pkgs.xorg.xcursorthemes
            # ----- gtk theme
            pkgs.fluent-gtk-theme
            pkgs.fluent-icon-theme
            # ----- qt6 theme
            pkgs.kdePackages.qt6ct
            pkgs.adwaita-qt6
            pkgs.darkly
          ];
          environment.variables = {
            QT_QPA_PLATFORMTHEME = "qt6ct";
            GTK_USE_PORTAL = "1";
          };
        };
      };
    };
}