{
  description = "Multi-machine Home Manager (Linux/macOS/NixOS)";

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

  outputs = { self, nixpkgs, home-manager, ... }: let
    system = builtins.currentSystem;
    pkgs = import nixpkgs { inherit system; };

    # Grab hostname from environment
    hostname = builtins.getEnv "HOSTNAME";
  in {
    # -------- Standalone Home Manager (macOS / non-NixOS Linux) --------
    homeConfigurations = {
      "${hostname}" = home-manager.lib.homeManagerConfiguration {
        inherit pkgs;
        modules = [
          ./common.nix
          ./${hostname}/home.nix
        ];
      };
    };

    # -------- NixOS Integration --------
    nixosConfigurations = {
      "${hostname}" = nixpkgs.lib.nixosSystem {
        inherit system;
        modules = [
          ./configuration.nix

          # Enable Home Manager as NixOS module
          home-manager.nixosModules.home-manager

          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;

            home-manager.users.elisha = {
              imports = [
                ./common.nix
                ./${hostname}/home.nix
              ];
            };
          }
        ];
      };
    };
  };
}