{
  description = "NixOS from Scratch";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-25.11";
    mango = {
      url = "github:tonybanters/mangowc";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = {
    self,
    nixpkgs,
    nixpkgs-stable,
    mango,
    ...
  }: let
    system = "x86_64-linux";
    pkgs-stable = import nixpkgs-stable {
      inherit system;
      config.allowUnfree = true;
    };
    mkHost = hostname:
      nixpkgs.lib.nixosSystem {
        system = system;
        specialArgs = {inherit pkgs-stable;};
        modules = [
          ./configuration.nix
          ./hosts/${hostname}/hardware-configuration.nix
          {networking.hostName = hostname;}
          mango.nixosModules.mango
        ] ++ (if hostname == "nixos-srv" then [./server] else []);
      };
  in {
    nixosConfigurations = {
      nixos-btw = mkHost "nixos-btw";
      nixos-srv = mkHost "nixos-srv";
    };
  };
}