{ config, lib, pkgs, pkgs-unstable, ... }:

{
  imports = [
    ./modules/system.nix
    ./modules/development.nix
    ./modules/shell.nix
    ./modules/yubikey.nix
  ];

  # ============================================
  # Shared NixOS Configuration
  # ============================================

  # System packages available to all users
  environment.systemPackages = with pkgs; [
    git
    curl
    vim
    htop
    home-manager
  ];

  # Allow unfree packages
  nixpkgs.config.allowUnfree = true;

  # Nix settings
  nix = {
    settings = {
      experimental-features = [ "nix-command" "flakes" ];
      auto-optimise-store = true;
    };
    gc = {
      automatic = true;
      dates = "weekly";
      options = "--delete-older-than 30d";
    };
  };

  # System-wide locale
  i18n.defaultLocale = "en_US.UTF-8";
  time.timeZone = "Europe/Berlin";

  # Networking basics
  networking.useDHCP = lib.mkDefault true;
  networking.networkmanager.enable = lib.mkDefault false;
}