{
  description = "Development Nix flake for the tennis court booking app (Loco.rs)";

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

  outputs = { self, nixpkgs, rust-overlay, ... }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems f;
    in
    {
      devShells = forAllSystems (system:
        let
          pkgs = import nixpkgs {
            inherit system;
            overlays = [ rust-overlay.overlays.default ];
          };
          rust = pkgs.rust-bin.stable.latest.default.override {
            extensions = [ "rust-src" "rust-analyzer" "clippy" "rustfmt" ];
          };
        in
        {
          default = pkgs.mkShell {
            buildInputs = [
              rust
              pkgs.pkg-config
              pkgs.openssl
              pkgs.sqlite
              pkgs.cmake
              pkgs.llvmPackages.clang
              pkgs.llvmPackages.libclang.lib
            ];
            PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig";
            LIBCLANG_PATH = "${pkgs.llvmPackages.libclang.lib}/lib";
            # Use clang for any BoringSSL / bindgen-driven compilation
            shellHook = ''
              export CC=clang
              export CXX=clang++
              echo "   Tennis court booking dev shell ready"
              echo "   rust: $(rustc --version)"
              echo "   tip:  cargo install loco-cli sea-orm-cli"
            '';
          };
        }
      );
    };
}