{
  den.aspects = {
    desktop = {
      nixos = 
        { pkgs, ... }:
        {
          programs = {
            dconf.enable = true; # desktop-config gnome
            adb.enable = true; # android-debug
          };
          environment.systemPackages = [
            # ----- gtk
            pkgs.gtk3
            pkgs.zenity
            # ----- screenshot (wayland)
            pkgs.grim
            pkgs.slurp
            pkgs.satty
            # ----- screenshot (x11)
            pkgs.flameshot
            # ----- output monitor (wayland)
            pkgs.kanshi
            pkgs.wlr-randr
            pkgs.way-displays
            # ----- output monitor (x11)
            pkgs.autorandr
            # ----- wallpaper (x11 + wayland)
            pkgs.waypaper
            # ----- wallpaper (wayland)
            pkgs.swww
            # ----- wallpaper (x11)
            pkgs.feh
            # ----- clipboard-tool (wayland)
            pkgs.wl-clipboard-rs
            # ----- notification-lib
            pkgs.libnotify
            pkgs.dunst
          ];
          programs.xwayland.enable = true;
          # ----- force electron-app to wayland-compatible
          environment.variables = {
            NIXOS_OZONE_WL = "1";
          };
          # ----- x11 services
          services = {
            xserver = {
              enable = true;
              xkb = {
                layout = "us";
                variant = "";
              };
            };
          };
        };
      };
    };
}