{
  description = "QRank Go (Gin + GORM) dev env with CGO (NixOS 25.05)";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";

  outputs = { self, nixpkgs }:
  let
    systems = [ "x86_64-linux" "aarch64-linux" ];
    forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f (import nixpkgs { inherit system; }));
  in
  {
    devShells = forAllSystems (pkgs:
      let
        # Pick the Go you want. pkgs.go is fine; change to pkgs.go_1_23 if you prefer a fixed version.
        go = pkgs.go;
      in {
        default = pkgs.mkShell {
          # Tools required for cgo and sqlite
          buildInputs = [
            go
            pkgs.gcc
            pkgs.pkg-config
            pkgs.sqlite
          ];

          # Optional (handy) tools
          nativeBuildInputs = [
            pkgs.git
          ];

          # Enable CGO so mattn/go-sqlite3 works
          CGO_ENABLED = 1;

          # If you plan static linking, uncomment:
          # hardeningDisable = [ "fortify" ];

          shellHook = ''
            echo "🔧 Nix dev shell ready (CGO_ENABLED=1)."
            echo "▶ Run: go run ."
          '';
        };
      });

    # Convenience runner: `nix run`
    apps = forAllSystems (pkgs: {
      default = {
        type = "app";
        program = pkgs.writeShellScriptBin "run-qrank" ''
          set -euo pipefail
          export CGO_ENABLED=1
          exec ${pkgs.go}/bin/go run .
        '' + "/bin/run-qrank";
      };
    });

    # Optional: formatter for this repo
    formatter = forAllSystems (pkgs: pkgs.nixpkgs-fmt);
  };
}