working maybe?

modules/styling/ags.nix

@@ -0,0 +1 @@
+_: {}

modules/styling/default.nix

@@ -0,0 +1,6 @@
+_: {
+  imports = [
+    ./ags.nix
+    ./stylix.nix
+  ];
+}

modules/styling/stylix.nix

@@ -0,0 +1,102 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  cfg = config.modules.themes.stylix;
+  inherit (config.modules.themes.stylix) scheme image;
+  inherit (config.modules.themes.stylix.cursor) size;
+  inherit (config.modules.themes.stylix.fontsizes) terminal popups;
+  inherit (config.modules.other.system) username;
+in {
+  options.modules.themes.stylix = {
+    enable = lib.mkEnableOption "stylix";
+    scheme = lib.mkOption {
+      description = " Color Scheme";
+      type = lib.types.str;
+    };
+    image = lib.mkOption {
+      description = "Image";
+      type = lib.types.path;
+    };
+    cursor = {
+      size = lib.mkOption {
+        description = "Cursor Size";
+        type = lib.types.int;
+      };
+      package = lib.mkOption {
+        description = "Cursor Package";
+        type = lib.types.package;
+      };
+      name = lib.mkOption {
+        description = "Cursor Name";
+        type = lib.type.str;
+      };
+    };
+    fontsizes = {
+      terminal = lib.mkOption {
+        description = "Terminal font size";
+        type = lib.types.int;
+      };
+      popups = lib.mkOption {
+        description = "Popup font size";
+        type = lib.types.int;
+      };
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    stylix = {
+      enable = true;
+      base16Scheme = scheme;
+      inherit image;
+      polarity = "dark";
+      autoEnable = true;
+      cursor = {
+        inherit size;
+        #size = 16;
+        package = pkgs.bibata-cursors;
+        name = "Bibata-Modern-Classic";
+      };
+      fonts = {
+        sizes = {
+          inherit terminal popups;
+        };
+        monospace = {
+          package =
+            pkgs.nerdfonts.override {fonts = ["JetBrainsMono"];};
+          name = "JetBrainsMono";
+        };
+        serif = {
+          package = pkgs.noto-fonts;
+          name = "Noto Serif";
+        };
+        sansSerif = {
+          package = pkgs.lexend;
+          name = "Lexend";
+        };
+        emoji = {
+          package = pkgs.noto-fonts-emoji;
+          name = "Noto Color Emoji";
+        };
+      };
+      opacity = {
+        applications = 0.9;
+        popups = 0.9;
+        desktop = 0.9;
+        terminal = 0.85;
+      };
+      targets = {
+        console.enable = true;
+        fish.enable = true;
+        grub.enable = false;
+        grub.useImage = true;
+        gtk.enable = true;
+        lightdm.enable = true;
+        nixos-icons.enable = true;
+        nixvim.enable = true;
+        plymouth.logoAnimated = true;
+      };
+    };
+  };
+}