{
  description = "NixOS baseline everywhere + per-host exceptions + HM deviations";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

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

  outputs = { self, nixpkgs, home-manager, ... }:
  let
    lib = nixpkgs.lib;

    # Helper: make a NixOS system for a host
    mkHost =
      { hostname
      , system ? "x86_64-linux"
      , username ? "henrov"
      }:
      lib.nixosSystem {
        inherit system;

        modules = [
          # --- Host entrypoint ---
          ./hosts/${hostname}/configuration.nix

          # --- Shared baseline for ALL machines ---
          ./modules/nixos/base.nix

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

          # --- HM integration settings ---
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;

            # Your user HM entrypoint
            home-manager.users.${username} = import ./home/${username}/home.nix;
          }
        ];

        specialArgs = {
          inherit self hostname username;
        };
      };

  in
  {
    nixosConfigurations = {
      traveldroid = mkHost {
        hostname = "traveldroid";
        system = "x86_64-linux";
        username = "henrov";
      };

      # Add more hosts like this:
      # workstation = mkHost { hostname = "workstation"; system = "x86_64-linux"; username = "henrov"; };
      # laptop = mkHost { hostname = "laptop"; system = "x86_64-linux"; username = "henrov"; };
    };
  };
}