{
  description = "Alex's NotFiles";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-26.05";

    home-manager = {
      url = "github:nix-community/home-manager/release-26.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    # macOS system management (paired with nixpkgs 26.05).
    nix-darwin = {
      url = "github:nix-darwin/nix-darwin/nix-darwin-26.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    globalprotect-openconnect.url = "github:yuezk/GlobalProtect-openconnect";

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

    nix4vscode = {
      url = "github:nix-community/nix4vscode";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    onedark-yazi = {
      url = "github:BennyOe/onedark.yazi";
      flake = false;
    };
  };

  outputs = { self, nixpkgs, home-manager, nix-darwin, globalprotect-openconnect, ... }@inputs:
  let
    linuxSystem = "x86_64-linux";

    # Home Manager wiring shared by the NixOS (Linux) hosts.
    # plasma-manager is Linux-only, so it lives here rather than in the
    # darwin block below.
    nixosHome = {
      home-manager = {
        useGlobalPkgs = true;
        useUserPackages = true;
        backupFileExtension = "backup";
        users.alex = import ./home/alex;
        extraSpecialArgs = { inherit inputs; isDarwin = false; };
        sharedModules = [ inputs.plasma-manager.homeModules.plasma-manager ];
      };
    };
  in {
    nixosConfigurations = {

      # To add a new Linux machine, duplicate this block and change the name.
      whitegrizzly = nixpkgs.lib.nixosSystem {
        system = linuxSystem;
        specialArgs = { inherit inputs; };
        modules = [
          ./hosts/whitegrizzly
          home-manager.nixosModules.home-manager
          nixosHome
        ];
      };

      oreo = nixpkgs.lib.nixosSystem {
        system = linuxSystem;
        specialArgs = { inherit inputs; };
        modules = [
          ./hosts/oreo
          home-manager.nixosModules.home-manager
          nixosHome
        ];
      };
    };

    darwinConfigurations = {

      seasoned = nix-darwin.lib.darwinSystem {
        specialArgs = { inherit inputs; };
        modules = [
          ./hosts/seasoned
          home-manager.darwinModules.home-manager
          {
            home-manager = {
              useGlobalPkgs = true;
              useUserPackages = true;
              backupFileExtension = "backup";
              users.alex = import ./home/alex;
              extraSpecialArgs = { inherit inputs; isDarwin = true; };
            };
          }
        ];
      };
    };
  };
}