{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-25.05";
  };

  outputs =
    { self, nixpkgs }:
    let
      supported-systems = [
        "x86_64-linux"
        "aarch64-linux"
      ];
      forAllSystems =
        f:
        nixpkgs.lib.genAttrs supported-systems (
          system:
          f rec {
            pkgs = nixpkgs.legacyPackages.${system};
            inherit system;
          }
        );
    in
    {
      # https://yannipapandreou.github.io/posts/jupyter-kernels-nix/index.html
      devShells = forAllSystems (
        { pkgs, ... }:
        {
          default = pkgs.mkShellNoCC {
            packages =
              let
                pythonPackages =
                  ps: with ps; [
                    ipykernel
                    jupyterlab
                    matplotlib
                    numpy
                    pandas
                    pip
                    notebook
                    jupyterlab-lsp
                    jupyterlab-git
                    python-lsp-server
                    python-lsp-ruff
                    python-lsp-ruff
                  ];
                pythonEnv = pkgs.python3.withPackages pythonPackages;
              in
              [
                pythonEnv
              ];
            shellHook = ''
              echo "Jupyter with Python kernel is ready. Run: 'jupyter lab' to launch."
            '';
          };
        }
      );

      formatter = forAllSystems ({ pkgs, ... }: pkgs.nixfmt-rfc-style);
    };
}