{
  description = "Scobleclaw Multi-Node Cluster — NixOS + k3s";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
  };

  outputs = { self, nixpkgs }:
    let
      shared-modules = [
        ./modules/tailscale.nix
        ./modules/k3s-cluster.nix
      ];

      mkSystem = system: hostModule: nixpkgs.lib.nixosSystem {
        inherit system;
        modules = shared-modules ++ [ hostModule ];
        specialArgs = { inherit self; };
      };
    in {
      nixosConfigurations = {
        n97-1 = mkSystem "x86_64-linux" [
          ./hardware-n97.nix
          ./nodes/n97-1.nix
        ];

        n97-2 = mkSystem "x86_64-linux" [
          ./hardware-n97.nix
          ./nodes/n97-2.nix
        ];

        n97-3 = mkSystem "x86_64-linux" [
          ./hardware-n97.nix
          ./nodes/n97-3.nix
        ];

        rpi4-1 = mkSystem "aarch64-linux" [
          ./hardware-rpi4.nix
          ./nodes/rpi4-1.nix
        ];

        rpi4-2 = mkSystem "aarch64-linux" [
          ./hardware-rpi4.nix
          ./nodes/rpi4-2.nix
        ];
      };
    };
}