{
    description = "NixOS server fleet";

    inputs = {
        nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
        disko.url = "github:nix-community/disko";
        disko.inputs.nixpkgs.follows = "nixpkgs";
        home-manager.url = "github:nix-community/home-manager";
        home-manager.inputs.nixpkgs.follows = "nixpkgs";
    };

    outputs = { self, nixpkgs, disko, home-manager }:
    let
        # options
        system = "x86_64-linux";
        release = "25.11";
        mainDisk = "/dev/sda";
        myUser = "victor";

        # helper
        lib = nixpkgs.lib;
    in {
        nixosConfigurations = {
            isengard = lib.nixosSystem {
                inherit system;
                specialArgs = { inherit release mainDisk myUser disko; };
                modules = [
                    ./hosts/isengard.nix
                    ./modules/base.nix
                    ./modules/docker.nix
                ]
                    ++ lib.optional (builtins.pathExists ./hardware-configuration.nix) ./hardware-configuration.nix;
            };
            palantir = lib.nixosSystem {
                inherit system;
                specialArgs = { inherit release mainDisk myUser disko; };
                modules = [
                    ./hosts/palantir.nix
                    ./modules/base.nix
                    ./modules/plasma.nix
                    ./modules/gaming.nix

                    home-manager.nixosModules.home-manager
                    ./modules/home.nix
                ]
                    ++ lib.optional (builtins.pathExists ./hardware-configuration.nix) ./hardware-configuration.nix;
            };
        };
    };
}