support nix flake for dev

assets/css/main.css

@@ -107,7 +107,7 @@
 }
 
 /*
-! tailwindcss v3.4.12 | MIT License | https://tailwindcss.com
+! tailwindcss v3.4.15 | MIT License | https://tailwindcss.com
 */
 
 /*
@@ -550,7 +550,7 @@ video {
 
 /* Make elements with the HTML hidden attribute stay hidden by default */
 
-[hidden] {
+[hidden]:where(:not([hidden="until-found"])) {
   display: none;
 }
 
@@ -904,7 +904,7 @@ html.dark {
 
 .tw-border-\[\#f0f0f0\] {
   --tw-border-opacity: 1;
-  border-color: rgb(240 240 240 / var(--tw-border-opacity));
+  border-color: rgb(240 240 240 / var(--tw-border-opacity, 1));
 }
 
 .tw-bg-bgColor-secondary {
@@ -1061,7 +1061,7 @@ html.dark {
 
 .dark\:tw-border-\[\#363636\]:is(.tw-dark *) {
   --tw-border-opacity: 1;
-  border-color: rgb(54 54 54 / var(--tw-border-opacity));
+  border-color: rgb(54 54 54 / var(--tw-border-opacity, 1));
 }
 
 @media print {

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1733935885,
+        "narHash": "sha256-xyiHLs6KJ1fxeGmcCxKjJE4yJknVJxbC8Y/ZRYyC8WE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5a48e3c2e435e95103d56590188cfed7b70e108c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,34 @@
+{
+  description = "Example JavaScript development environment for Zero to Nix";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      allSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+
+      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in
+    {
+      devShells = forAllSystems ({ pkgs }: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+            nodejs_23
+            hugo
+          ];
+          shellHook = ''
+            npm install && npm run dev
+          '';
+        };
+      });
+    };
+}