diff --git a/flake.nix b/flake.nix
index 708accc..b51b601 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,38 +1,77 @@
-# Template: https://nixos-and-flakes.thiscute.world/development/intro
 {
-  description = "Dev Shell for dobutterfliescry.net";
+  description = "cry64's dobutterfliescry.net";
 
   inputs = {
+    systems.url = "github:nix-systems/default";
+
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
   };
 
   outputs = {
+    self,
     nixpkgs,
     nixpkgs-unstable,
     ...
-  }: let
-    system = "x86_64-linux";
-    pkgs = import nixpkgs {
-      inherit system;
-    };
-    pkgs-unstable = import nixpkgs-unstable {
-      inherit system;
-    };
+  } @ inputs: let
+    systems = import inputs.systems;
+
+    mkPkgs = pkgs: system:
+      import pkgs {
+        inherit system;
+        allowUnfree = false;
+        allowBroken = false;
+        overlays = builtins.attrValues self.overlays or {};
+      };
+
+    forAllSystems = f:
+      nixpkgs.lib.genAttrs systems (system:
+        f system (mkPkgs nixpkgs system) (mkPkgs nixpkgs-unstable system));
   in {
-    devShells."${system}".default = pkgs.mkShell {
-      packages = [
-        # dev local server
-        pkgs.simple-http-server
-
-        # scss->css transpilation
-        # pkgs.sass seems broken on Nix currently, use pkgs.dark-sass instead
-        pkgs.dart-sass
-        # image baking (from .svg)
-        pkgs.imagemagick
-      ];
-
-      shell = "${pkgs.bash}/bin/bash";
+    overlays.default = self: super: {
+      dobutterfliescry-net = super.stdenv.mkDerivation {
+        name = "dobutterfliescry.net";
+        src = self;
+        nativeBuildInputs = [super.makeWrapper];
+        installPhase = ''
+          mkdir -p $out
+          cp -r $src/www $out/
+        '';
+      };
     };
+
+    checks = self.packages;
+    packages = forAllSystems (system: pkgs: upkgs: rec {
+      default = dobutterfliescry-net;
+      dobutterfliescry-net = pkgs.dobutterfliescry-net;
+    });
+
+    devShells = forAllSystems (system: pkgs: upkgs: let
+      devPackages = with pkgs; [
+        # dev local server
+        simple-http-server
+
+        # css baking
+        ruby.devEnv
+        rubyPackages_3_3.sass
+        # image baking (from .svg)
+        imagemagick
+      ];
+    in {
+      default = pkgs.mkShell {
+        packages = devPackages;
+        shell = "${pkgs.bash}/bin/bash";
+      };
+
+      fhs =
+        (pkgs.buildFHSEnv
+          (pkgs.appimageTools.defaultFhsEnvArgs
+            // {
+              name = "dobutterfliescry.net-fhs";
+              targetPkgs = devPackages;
+              runScript = "bash";
+              extraOutputsToInstall = ["dev"];
+            })).env;
+    });
   };
 }