{
  pkgs,
  lib,
  ...
}:
with lib; {
  imports = [../.]; # Common config.

  # Configure the bootloader.
  boot = {
    # Use linux-zen kernel.
    kernelPackages = pkgs.linuxKernel.packages.linux_zen;

    # Enable systemd-boot
    loader.systemd-boot.enable = true;
    loader.efi.canTouchEfiVariables = true;

    # Enable quiet boot with splash
    plymouth.enable = true;
    consoleLogLevel = 3;
    initrd.verbose = false;
    kernelParams = [
      "quiet"
      "splash"
      "boot.shell_on_fail"
      "udev.log_priority=3"
      "rd.systemd.show_status=auto"
    ];
  };

  # Emulate aarch64 to build system for weebill.
  boot.binfmt.emulatedSystems = [ "aarch64-linux" ];

  # Enable smart card support (for YubiKey).
  services.pcscd.enable = true;

  # Enable the GNOME Desktop Environment.
  services.xserver = {
    enable = true;

    excludePackages = [
      pkgs.xterm # Don't install xterm.
    ];

    displayManager.gdm.enable = true;
    desktopManager.gnome.enable = true;
  };

  # Exclude some default gnome applications.
  environment.gnome.excludePackages = (
    with pkgs; [
      epiphany # Browser (replaced by Librewolf).
      evince # Document viewer (replaced by papers, which will become default on Gnome 49).
      gnome-connections # Remote desktop viewer.
      gnome-console # Terminal (replaced by ghostTTY).
      gnome-maps # Maps viewer.
      gnome-music # Music player.
      gnome-tour # First-boot tour.
      simple-scan # Scanning app (replaced by naps2).
      totem # Movie player (replaced by Celluloid).
      yelp # Help viewer.
    ]
  );

  # Gaming.
  programs.steam.enable = true;
  programs.gamemode.enable = true;

  # Allow opening terminal applications from gnome app launcher.
  xdg.terminal-exec = {
    enable = true;
    settings.default = ["ghostty.desktop"];
  };

  # Enable configuration of keyboard.
  hardware.keyboard.qmk.enable = true;
  services.udev.packages = [pkgs.via];

  # Nintendo Switch udev rules.
  services.udev.extraRules = ''
    SUBSYSTEM=="usb", ATTRS{idVendor}=="057e", ATTRS{idProduct}=="3000", MODE="0666"
    SUBSYSTEM=="usb", ATTRS{idVendor}=="0955", ATTRS{idProduct}=="7321", MODE="0666"
  '';

  # Enable CUPS to print documents.
  services.printing = {
    enable = true;
    drivers = [pkgs.brlaser pkgs.cups-dymo]; # Brother laser printer & Dymo label printer.
  };

  # Scanner drivers.
  hardware.sane = {
    enable = true;
    extraBackends = [pkgs.cnijfilter2];
  };

  # https://github.com/tailscale/tailscale/issues/4432#issuecomment-1112819111
  networking.firewall.checkReversePath = false;

  # Enable sound with pipewire.
  services.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
  };

  # Enable CPU frequency scaling management.
  services.power-profiles-daemon.enable = mkForce false; # enabled by gnome
  services.tlp.enable = mkForce false; # enabled by nixos-hardware
  services.auto-cpufreq.enable = true;
}