{ den, ... }: {
  den.aspects.core.nixos = { pkgs, ... }: {
    nixpkgs.config.allowUnfree = true;

    nix = {
      settings = {
        experimental-features = [ "nix-command" "flakes" ];
        auto-optimise-store = true;
        
      };
      gc = {
        automatic = true;
        dates = "weekly";
        options = "--delete-older-than 7d";
      };
    };

    services.xserver.xkb.layout = "us";

    environment.systemPackages = with pkgs; [
      curl 
      wget 
      neovim
      btop
      nixd
    ];

    services.pipewire = {
      enable = true;
      alsa.enable = true;
      alsa.support32Bit = true;
      pulse.enable = true;
    };

    networking.networkmanager.enable = true;
    time.timeZone = "America/Sao_Paulo";
    i18n.defaultLocale = "en_US.UTF-8";
  };
}