{...}: {
	den.aspects.core.os = {
		pkgs,
		lib,
		...
	}: {
		# System utilities
		environment.systemPackages =
			lib.optionals pkgs.stdenv.isLinux [
				pkgs.lm_sensors
			];

		programs.fish.enable = true;
		environment.shells = [pkgs.nushell];

		nixpkgs = {
			config = {
				allowUnfree = true;
			};
		};

		nix = {
			package = pkgs.nix;
			settings = {
				cores = 4;
				substituters = [
					"https://nix-community.cachix.org"
					"https://cache.nixos.org"
				];
				trusted-public-keys = [
					"cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
					"nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
				];
			};
			gc = {
				automatic = true;
				options = "--delete-older-than 30d";
			};
			extraOptions = ''
				experimental-features = nix-command flakes
			'';
		};
	};
}