{
  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    stable.url = "nixpkgs/nixos-23.05";

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

    hyprland = {
      url = "github:hyprwm/Hyprland";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    hyprland-hy3 = {
      url = "github:outfoxxed/hy3";
      inputs.hyprland.follows = "hyprland";
    };

    hyprpaper = {
      url = "github:hyprwm/Hyprpaper";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    # devenv
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = inputs @ { self, nixpkgs, ... }: {
    nixosConfigurations = {
      lenovo = nixpkgs.lib.nixosSystem rec {
        system = "x86_64-linux";
        specialArgs = { inherit system inputs; };

        modules = [
          (import ./modules/impurity.nix self)
          ./modules/preserve-system.nix
          ./modules/devenv
          ./modules/overlay-pkgs
          ./modules/core
          ./modules/system.nix
          ./modules/user
          ./modules/hyprland
          ./systems/lenovo
        ];
      };

      lenovo-impure = self.nixosConfigurations.lenovo.extendModules { modules = [ { impurity.enable = true; } ]; };
    };
  };
}