{
  description = "gar - Tiling window manager with smart splits";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, rust-overlay }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        overlays = [ (import rust-overlay) ];
        pkgs = import nixpkgs {
          inherit system overlays;
        };

        rustToolchain = pkgs.rust-bin.stable.latest.default.override {
          extensions = [ "rust-src" "rust-analyzer" ];
        };
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            rustToolchain
            pkg-config

            # X11 dependencies
            xorg.libX11
            xorg.libXcursor
            xorg.libXrandr
            xorg.libXi
            xorg.libxcb

            # For testing
            xorg.xorgserver  # Xephyr
          ];

          shellHook = ''
            echo "gar development shell"
            echo "Run 'cargo build' to build"
            echo "Run 'cargo run' to start (requires X server)"
          '';

          RUST_BACKTRACE = 1;
        };

        packages.default = pkgs.rustPlatform.buildRustPackage {
          pname = "gar";
          version = "0.1.0";
          src = ./.;
          cargoLock.lockFile = ./Cargo.lock;

          nativeBuildInputs = with pkgs; [ pkg-config ];
          buildInputs = with pkgs; [
            xorg.libX11
            xorg.libxcb
          ];
        };
      }
    );
}