{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    # nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
    catppuccin.url = "github:catppuccin/nix";
    colmena.url = "github:zhaofengli/colmena";
    colmena.inputs.nixpkgs.follows = "nixpkgs";
    disko.url = "github:nix-community/disko";
    disko.inputs.nixpkgs.follows = "nixpkgs";
    home-manager.url = "github:nix-community/home-manager/master";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
    # nixos-cosmic.url = "github:lilyinstarlight/nixos-cosmic";
    # nixos-cosmic.inputs.nixpkgs.follows = "nixpkgs";
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
  };

  outputs = inputs@{ self, nixpkgs, nix,
    # nixos-cosmic,
    nixos-hardware, home-manager, catppuccin, colmena, ... }:
    let
      inherit (self) outputs;
      lib = nixpkgs.lib // home-manager.lib;
      systems = [ "x86_64-linux" "aarch64-linux" ];
      forEachSystem = f: lib.genAttrs systems (system: f pkgsFor.${system});
      pkgsFor = lib.genAttrs systems (system:
        import nixpkgs {
          inherit system;
          config.allowUnfree = true;
        });
    in {
      inherit lib;
      colmena = {
        meta = {
          nixpkgs = import nixpkgs { system = "x86_64-linux"; };
          specialArgs = { inherit inputs outputs; };
        };
        # ace = import ./hosts/ace/colmena.nix;
        # eve = import ./hosts/eve/colmena.nix;
        fred = import ./hosts/fred/colmena.nix;
        loki = import ./hosts/loki/colmena.nix;
        # pocket2 = import ./hosts/pocket2/colmena.nix;
        smaug = import ./hosts/smaug/colmena.nix;
        w1 = import ./hosts/w1/colmena.nix;
        # w2 = import ./hosts/w2/colmena.nix;
        # t2 = import ./hosts/t2/colmena.nix;
        # pi1 = import ./hosts/pi1/colmena.nix;
      };

      nixosConfigurations = {
        # clients
        ace = lib.nixosSystem {
          modules = [ ./hosts/ace ];
          specialArgs = { inherit inputs outputs; };
        };
        dragon = lib.nixosSystem {
          modules = [ ./hosts/dragon ];
          specialArgs = { inherit inputs outputs; };
        };
        eve = lib.nixosSystem {
          modules = [ ./hosts/eve ];
          specialArgs = { inherit inputs outputs; };
        };
        loki = lib.nixosSystem {
          modules = [ ./hosts/loki ];
          specialArgs = { inherit inputs outputs; };
        };

        pocket2 = lib.nixosSystem {
          modules = [ ./hosts/pocket2 ];
          specialArgs = { inherit inputs outputs; };
        };
        smaug = lib.nixosSystem {
          modules = [ ./hosts/smaug ];
          specialArgs = { inherit inputs outputs; };
        };
        t2 = lib.nixosSystem {
          modules = [ ./hosts/t2 ];
          specialArgs = { inherit inputs outputs; };
        };

        # servers
        display = lib.nixosSystem {
          modules = [ ./hosts/display ];
          specialArgs = { inherit inputs outputs; };
        };
        fred = lib.nixosSystem {
          modules = [ ./hosts/fred ];
          specialArgs = { inherit inputs outputs; };
        };
        vm = lib.nixosSystem {
          modules = [
            "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix"
            "${nixpkgs}/nixos/modules/installer/cd-dvd/channel.nix"
            ./hosts/vm
          ];
          specialArgs = { inherit inputs outputs; };
        };
        harper2 = lib.nixosSystem {
          modules = [ ./hosts/harper2 ];
          specialArgs = { inherit inputs outputs; };
        };
        harper = lib.nixosSystem {
          modules = [ ./hosts/harper ];
          specialArgs = { inherit inputs outputs; };
        };
        nuwww = lib.nixosSystem {
          modules = [ ./hosts/nuwww ];
          specialArgs = { inherit inputs outputs; };
        };
        pihole = lib.nixosSystem {
          modules = [ ./hosts/pihole ];
          specialArgs = { inherit inputs outputs; };
        };
        www2 = lib.nixosSystem {
          modules = [ ./hosts/www2 ];
          specialArgs = { inherit inputs outputs; };
        };
        w1 = lib.nixosSystem {
          modules = [ ./hosts/w1 ];
          specialArgs = { inherit inputs outputs; };
        };
        # w2 = lib.nixosSystem {
        #   modules = [./hosts/w2];
        #   specialArgs = {
        #     inherit inputs outputs;
        #   };
        # };
      };
    };
}