{
  description = "NixOS configuration";

  inputs = {
    # NixOS official package source
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
    home-manager = {
      url = "github:nix-community/home-manager/release-25.11";
      # The `follows` keyword in inputs is used for inheritance.
      # Here, `inputs.nixpkgs` of home-manager is kept consistent with
      # the `inputs.nixpkgs` of the current flake,
      # to avoid problems caused by different versions of nixpkgs.
      inputs.nixpkgs.follows = "nixpkgs";
    };
    locutus.url = "git+https://git.figtree.dev/alex/locutus";
  };

  outputs = { self, nixpkgs, home-manager, ... }@inputs: {
    nixosConfigurations = {
      case = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";

        specialArgs = { inherit inputs; };
        modules = [

          ./hosts/case/configuration.nix

          # enable home manager
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;

            home-manager.users.alex = import ./alex/home.nix;

            # Optionally, use home-manager.extraSpecialArgs to pass arguments to
            # home.nix
            home-manager.extraSpecialArgs = { inherit inputs; isDesktop=true; };
          }
        ];
      };
      count = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";

        specialArgs = { inherit inputs; };
        modules = [

          ./hosts/count/configuration.nix

          # enable home manager
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;

            home-manager.users.alex = import ./alex/home.nix;

            # Optionally, use home-manager.extraSpecialArgs to pass arguments to
            # home.nix
            home-manager.extraSpecialArgs = { inherit inputs; isDesktop=true; };
          }
        ];
      };
      armitage = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";

        specialArgs = { inherit inputs; };
        modules = [

          ./hosts/armitage/configuration.nix

          # enable home manager
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;

            home-manager.users.alex = import ./alex/home.nix;

            # Optionally, use home-manager.extraSpecialArgs to pass arguments to
            # home.nix
            home-manager.extraSpecialArgs = { inherit inputs; isDesktop=true; };
          }
        ];
      };
      alt = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";

        specialArgs = { inherit inputs; };
        modules = [

          ./hosts/alt/configuration.nix

          # enable home manager
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;

            home-manager.users.alex = import ./alex/home.nix;

            # Optionally, use home-manager.extraSpecialArgs to pass arguments to
            # home.nix
            home-manager.extraSpecialArgs = { inherit inputs; isDesktop=false; };
          }
        ];
      };
      nightcity = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";

        specialArgs = { inherit inputs; };
        modules = [

          ./hosts/nightcity/configuration.nix

          # enable home manager
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;

            home-manager.users.alex = import ./alex/home.nix;

            # Optionally, use home-manager.extraSpecialArgs to pass arguments to
            # home.nix
            home-manager.extraSpecialArgs = { inherit inputs; isDesktop=false; };
          }
        ];
      };
      # other hosts...
    };
  };
}