{
  description = "NixOS configuration for all hosts";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; #"github:NixOS/nixpkgs/nixos-25.05";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, nixpkgs-unstable, flake-utils, home-manager, ... }: 
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs {
        inherit system;
        config.allowUnfree = true;
      };
      pkgs-unstable = import nixpkgs-unstable {
        inherit system;
        config.allowUnfree = true;
      };
      sharedModules = [
        ./hosts/common.nix
        {
          nixpkgs.config.allowUnfree = true;
        }
        home-manager.nixosModules.home-manager
        ({ config, ...}: {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.extraSpecialArgs = {
            inherit (config.networking) hostName;        
          }; # end extraSpecialArgs
          home-manager.users.alisceon = import ./home/alisceon.nix;
          home-manager.backupFileExtension = "backup";
        }) # end home manager
      ];
    in
    {
      nixosConfigurations = {
        electra = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = sharedModules ++ [
            ./hosts/electra/configuration.nix
          ]; # end modules
        }; # end electra
        tower = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = sharedModules ++ [
            ./hosts/tower/configuration.nix
          ]; # end modules
        }; # end tower
      }; # end nixos conf
    }; # end "in"
} # end file