{
  nixConfig = {
    substituters = [
      "https://mirrors.ustc.edu.cn/nix-channels/store"
      "https://cache.nixos.org"
    ];
  };

  inputs = {
    # nixpkgs-darwin.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    nixpkgs-darwin.url = "github:nixos/nixpkgs/nixpkgs-23.11-darwin";

    darwin = {
      url = "github:lnl7/nix-darwin";
      inputs.nixpkgs.follows = "nixpkgs-darwin";
    };

    home-manager = {
      url = "github:nix-community/home-manager/master";
      inputs.nixpkgs.follows = "nixpkgs-darwin";
    };
  };

  outputs = inputs@{ nixpkgs, home-manager, darwin, ... }: {
    darwinConfigurations.TobAir = darwin.lib.darwinSystem {
      system = "aarch64-darwin";

      pkgs = import nixpkgs {
        system = "aarch64-darwin";
        config.allowUnfree = true;
      };

      modules = [
        ./modules/nix-core.nix
        ./modules/darwin
        home-manager.darwinModules.home-manager
        {
          home-manager = {
            useGlobalPkgs = true;
            useUserPackages = true;
            extraSpecialArgs = inputs;
            users.tobi.imports = [ ./modules/home-manager ];
          };
        }
      ];
    };
  };
}