{
  config,
  lib,
  pkgs,
  inputs,
  ...
}:
{
  imports = [
    ./stylix.nix
    ./nixvim/nixvim.nix

  ];

  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  boot.kernelPackages = pkgs.linuxPackages;
  nix.settings.experimental-features = [
    "nix-command"
    "flakes"
  ];
  nix.package = pkgs.lixPackageSets.stable.lix;
  nix.settings.trusted-users = [ "lucy" ];
  nix.settings = {
    substituters = [ "https://hyprland.cachix.org" ];
    trusted-public-keys = [ "hyprland.cachix.org-1:a7pgxzMz7+chwVL3/pzj6jIBMioiJM7ypFP8PwtkuGc=" ];
  };
  networking.hostName = "nixos"; # Define your hostname.
  networking.networkmanager.enable = true;
  networking.networkmanager.wifi.powersave = false;
  time.timeZone = "Europe/Berlin";
  i18n.defaultLocale = "en_US.UTF-8";
  i18n.extraLocaleSettings = {
    LC_ADDRESS = "de_DE.UTF-8";
    LC_IDENTIFICATION = "de_DE.UTF-8";
    LC_MEASUREMENT = "de_DE.UTF-8";
    LC_MONETARY = "de_DE.UTF-8";
    LC_NAME = "de_DE.UTF-8";
    LC_NUMERIC = "de_DE.UTF-8";
    LC_PAPER = "de_DE.UTF-8";
    LC_TELEPHONE = "de_DE.UTF-8";
    LC_TIME = "de_DE.UTF-8";
  };
  services.upower.enable = true;
  services.xserver.enable = false;
  services.xserver.xkb = {
    layout = "eu";
    variant = "";
  };
  services = {
    displayManager.ly.enable = true;
  };
  programs.hyprland = {
    package = inputs.hyprland.packages.${pkgs.stdenv.hostPlatform.system}.hyprland;
    enable = true;
    withUWSM = true; # recommended for most users
    xwayland.enable = true; # Xwayland can be disabled.
  };
  security.doas.enable = true;
  security.sudo.enable = false;
  security.doas.extraRules = [
    {
      users = [
        "lucy"
        "root"
      ];
      groups = [ "wheel" ];
      keepEnv = true;
      persist = true; # Optional, only require password verification a single time
    }
  ];

  programs.bash.interactiveShellInit = ''
    complete -F _command doas
  '';
  # Enable CUPS to print documents.
  services.printing.enable = true;

  # 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 touchpad support (enabled default in most desktopManager).
  services.libinput.enable = true;
  programs.xppen = {
    enable = false;
    package = pkgs.xppen_4.overrideAttrs (old: {
      src = pkgs.fetchurl {
        url = "https://download01.xp-pen.com/file/2026/04/XPPenLinux4.0.15-260422.tar.gz";
        hash = "sha256-Jady+pbqnzmVMuM0Io4/aE5B7dqNlDKPsnRj/Fbln6U=";
      };
      buildInputs = (old.buildInputs or [ ]) ++ [
        pkgs.libXtst
        pkgs.libXrandr
      ];
    });
  };

  # Define a user account. Don't forget to set a password with ‘passwd’.
  fonts.packages = with pkgs; [
    noto-fonts
    noto-fonts-cjk-sans
    noto-fonts-color-emoji
    (iosevka.override {
      set = "Custom";
      privateBuildPlan = ''
        [buildPlans.IosevkaCustom]
        family = "Iosevka Custom"
        spacing = "fontconfig-mono"
        serifs = "slab"
        noCvSs = true
        exportGlyphNames = false

        [buildPlans.IosevkaCustom.variants]
        inherits = "ss12"

        [buildPlans.IosevkaCustom.weights.Regular]
        shape = 400
        menu = 400
        css = 400

        [buildPlans.IosevkaCustom.weights.Bold]
        shape = 700
        menu = 700
        css = 700

        [buildPlans.IosevkaCustom.slopes.Upright]
        angle = 0
        shape = "upright"
        menu = "upright"
        css = "normal"

        [buildPlans.IosevkaCustom.slopes.Italic]
        angle = 9.4
        shape = "italic"
        menu = "italic"
        css = "italic"
      '';
    })
    nerd-fonts.symbols-only
  ];
  users.users."lucy" = {
    isNormalUser = true;
    description = "lucy";
    extraGroups = [
      "networkmanager"
      "wheel"
    ];
  };
  programs.direnv.enable = true;
  # Allow unfree packages
  nixpkgs.config.allowUnfree = true;

  environment.systemPackages = with pkgs; [
    kdePackages.kcalc # Calculator
    kdePackages.kclock # Clock app
    kdePackages.sddm-kcm # SDDM configuration module
    kdePackages.isoimagewriter # Write hybrid ISOs to USB
    wl-clipboard
    btop
    ripgrep
    fd
    bat
    grimblast
    git
  ];
  hardware.bluetooth = {
    enable = true;
    powerOnBoot = true;
    settings = {
      General = {
        Experimental = true;
        FastConnectable = true;
      };
      Policy = {
        AutoEnable = true;
      };
    };
  };

  # DO NOT CHANGE!!
  system.stateVersion = "26.05"; # Did you read the comment?

}