{
  pkgs,
  username,
  ...
}:
let
  config.boot.kernelPackages = pkgs.linuxPackages_latest;
in
{
  system.stateVersion = "25.11";

  imports = [
    ./hardware-configuration.nix

    ../../system/core
    ../../programs/ssh.nix
    ../../programs/utility.nix
    ../../programs/shell.nix
    ../../programs/docker.nix
    ../../programs/v4l2.nix
    ../../programs/desktop/hyprland.nix
    ../../programs/fcitx.nix
    ../../programs/steam.nix
  ];
  environment.systemPackages = with pkgs; [
    openssl

    bluez
    bluez-tools
    bluetuith
    
    brightnessctl

    fzf
    ghq
  ];
  environment.sessionVariables.NIXOS_OZONE_WL = "1";

  users.users.${username} = {
    extraGroups = [
      "adbusers"
      "docker"
    ];
    shell = pkgs.fish;
    openssh.authorizedKeys.keys = [
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIfql/a6ZtxOPgBhFzOfgTO6HGcy0Se9mgMLmOa40vMF"
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIW2Yrqwi4YjIrdI8mygX5pTHDPmrUgbmpZ4WxoTqORi keihi@Vostro-LapTop"
    ];
  };
  programs.adb.enable = true;
  programs.nix-ld.enable = true;
  programs.light.enable = true;

  services.openssh.enable = true;

  services.udisks2.enable = true;

  networking.firewall.allowedTCPPorts = [
    22
  ];
  networking.firewall.allowedUDPPorts = [ ];

  services.udev.extraRules = ''
    ATTRS{idVendor}=="3151", ATTRS{idProduct}=="502d", MODE="0777"
    ATTRS{idVendor}=="414", ATTRS{idProduct}=="211a", MODE="0777"
    KERNEL=="hidraw*", SUBSYSTEM=="hidraw", MODE="0660", GROUP="input"
  '';

  hardware.bluetooth = {
    enable = true;
    package = pkgs.bluez;
    powerOnBoot = true;
    settings = {
      General = {
        ControllerMode = "dual";
        Experimental = true;
        KernelExperimental = true;
        FastConnectable = true;
        # セキュリティレベルを調整
        Class = "0x000100";
        # ペアリングタイムアウトを延長
        PairableTimeout = 0;
      };
      Policy = {
        AutoEnable = true;
      };
    };
  };

  boot.kernelPackages = config.boot.kernelPackages;
  boot.extraModulePackages = [ config.boot.kernelPackages.v4l2loopback ];
  boot.kernelModules = [
    "v4l2loopback"
  ];

  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
}