Change hero red to dark grey

Updated the stats bar below the hero image to use a dark grey background (`bg-zinc-700`) instead of the primary red, matching the user's request to align with the hero image's color scheme.

X-Lovable-Edit-ID: edt-2bf80f41-db08-48bc-83e2-984437c1d341

src/pages/Index.tsx

@@ -78,7 +78,7 @@ const Index = () => {
         />
         
         {/* Animated Stats Bar - Bottom of hero */}
-        <div className="bg-primary py-4">
+        <div className="bg-zinc-700 py-4">
           <div className="container mx-auto px-4">
             <div className="flex flex-wrap justify-center gap-8 md:gap-16 animate-fade-in">
               <div className="text-center">