{ pkgs, ... }:

{
  time.timeZone = "Asia/Shanghai";
  i18n.defaultLocale = "en_US.UTF-8";

  nix.settings = {
    experimental-features = [ "nix-command" "flakes" ];
    auto-optimise-store = true;
    trusted-users = [ "root" "ldx" "ye-lw21" ];
    substituters = [
      "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"
      "https://cache.nixos.org/"
    ];
    connect-timeout = 5;
    stalled-download-timeout = 15;
    flake-registry = "";  # disable global registry fetch (channels.nixos.org unreachable from CN)
  };

  environment.systemPackages = with pkgs; [
    curl
    wget
    git
    vim
    tmux
    htop
    pciutils
    usbutils
  ];
}