{
  config,
  lib,
  inputs,
  ...
}:
# The shared foundation for every host and guest.
{
  imports = [ inputs.home-manager.nixosModules.home-manager ];

  options.user = {
    name = lib.mkOption {
      type = lib.types.str;
      default = "alexion";
      description = ''
        Names the primary user account.
        Host configuration uses this name for the Home Manager user.
      '';
    };
  };

  config = {
    system.stateVersion = "26.05";

    nixpkgs.config.allowUnfree = true;
    nix.settings.experimental-features = [
      "nix-command"
      "flakes"
    ];

    users.users.${config.user.name} = {
      isNormalUser = true;
      extraGroups = [
        "wheel"
        "storage"
      ];
    };

    users.groups.storage.gid = 10000;

    time.timeZone = "America/New_York";
    i18n.defaultLocale = "en_GB.UTF-8";
  };
}