{
  description = "Audio transcription with faster-whisper (local models only)";

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

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };

        pythonEnv = pkgs.python313.withPackages (ps: with ps; [
          pip
        ]);
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            pythonEnv
            uv
            ffmpeg
            zlib
            stdenv.cc.cc.lib
          ];

          shellHook = ''
            export LD_LIBRARY_PATH="${pkgs.lib.makeLibraryPath [
              pkgs.zlib
              pkgs.stdenv.cc.cc.lib
              pkgs.ffmpeg
            ]}:$LD_LIBRARY_PATH"

            # Ensure venv exists
            if [ ! -d .venv ]; then
              uv venv
            fi

            echo "Transcription environment ready."
            echo "Run: uv run python transcribe.py /path/to/recordings"
          '';
        };
      }
    );
}