{
  description = "Evie's machine configurations";

  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
    pkgs = import nixpkgs {config = {allowUnfree = true;};};
    common-config = {...}: {
      nix = {
        settings.experimental-features = ["nix-command" "flakes"];
        gc = {
          automatic = true;
          dates = "daily";
          options = "--delete-older-than 7d";
        };
        extraOptions = ''
          keep-outputs = true
          keep-derivations = true
        '';
      };
      nixpkgs.config.allowUnfree = true;
      networking = {
        networkmanager.enable = true;
        firewall.enable = true;
      };
      services.power-profiles-daemon.enable = true;
      virtualisation.podman.enable = true;
      programs = {
        ssh.startAgent = true;
        dconf.enable = true;
        fish.enable = true;
        zsh.enable = true;
      };
      fonts.fontconfig.enable = true;
      environment.localBinInPath = true;
    };
    locale-en_GB = {...}: {
      services.xserver = {
        layout = "gb";
        xkbVariant = "";
      };
      console.keyMap = "uk";

      # Set your time zone.
      time.timeZone = "Europe/London";

      # Select internationalisation properties.
      i18n.defaultLocale = "en_GB.UTF-8";

      i18n.extraLocaleSettings = {
        LC_ADDRESS = "en_GB.UTF-8";
        LC_IDENTIFICATION = "en_GB.UTF-8";
        LC_MEASUREMENT = "en_GB.UTF-8";
        LC_MONETARY = "en_GB.UTF-8";
        LC_NAME = "en_GB.UTF-8";
        LC_NUMERIC = "en_GB.UTF-8";
        LC_PAPER = "en_GB.UTF-8";
        LC_TELEPHONE = "en_GB.UTF-8";
        LC_TIME = "en_GB.UTF-8";
      };
    };
    audio = {...}: {
      sound.enable = true;
      hardware.pulseaudio.enable = false;
      security.rtkit.enable = true;
      services.pipewire = {
        enable = true;
        alsa.enable = true;
        alsa.support32Bit = true;
        pulse.enable = true;
      };
      programs.noisetorch.enable = true;
    };
    bluetooth = {...}: {
      hardware.bluetooth = {
        enable = true;
        powerOnBoot = true;
      };
    };
  in {
    nixosConfigurations = {
      Legion = nixpkgs.lib.nixosSystem {
        inherit pkgs;
        system = "x86_64-linux";
        modules = [
          home-manager.nixosModules.home-manager
          common-config
          locale-en_GB
          ./hosts/Legion/configuration.nix
          ./services/Legion.nix
        ];
      };
      N0245 = nixpkgs.lib.nixosSystem {
        inherit pkgs;
        system = "x86_64-linux";
        modules = [
          home-manager.nixosModules.home-manager
          common-config
          locale-en_GB
          audio
          bluetooth
          ./hosts/N0245/configuration.nix
          ./locales/en_GB.nix
          ./wm/sway.nix
          ./services/syncthing/N0245.nix
        ];
      };
    };
    homeConfigurations = {
      "tux" = home-manager.lib.homeManagerConfiguration {
        pkgs = nixpkgs.legacyPackages."aarch64-darwin";
        modules = [./hosts/Monarch/home.nix];
      };
      "xenia" = home-manager.lib.homeManagerConfiguration {
        pkgs = nixpkgs.legacyPackages."aarch64-linux";
        modules = [./hosts/Northstar/home.nix];
      };
    };
  };
}