fix: admin sticky header, pricing rules textarea, hero 3D text shadow

- Admin mobile header: sticky top so it stays visible on scroll
- Pricing rules: auto-expanding textarea instead of single-line input
- Hero text: layered gold+shadow for 3D depth effect

src/app/admin/layout.tsx

@@ -163,7 +163,7 @@ export default function AdminLayout({
       {/* Main content */}
       <div className="flex-1 flex flex-col min-w-0">
         {/* Top bar (mobile) */}
-        <header className="flex items-center gap-3 border-b border-white/10 px-4 py-3 lg:hidden">
+        <header className="sticky top-0 z-30 flex items-center gap-3 border-b border-white/10 bg-neutral-950 px-4 py-3 lg:hidden">
           <button
             onClick={() => setSidebarOpen(true)}
             aria-label="Открыть меню"

src/app/admin/pricing/page.tsx

@@ -200,11 +200,16 @@ function PricingContent({ data, update }: { data: PricingData; update: (d: Prici
               onChange={(rules) => update({ ...data, rules })}
               inline
               renderItem={(rule, _i, updateItem) => (
-                <input
-                  type="text"
+                <textarea
                   value={rule}
-                  onChange={(e) => updateItem(e.target.value)}
-                  className="w-full rounded-lg border border-white/10 bg-neutral-800 px-3 py-2 text-sm text-white placeholder-neutral-500 outline-none hover:border-gold/30 focus:border-gold transition-colors"
+                  onChange={(e) => {
+                    updateItem(e.target.value);
+                    e.target.style.height = "auto";
+                    e.target.style.height = e.target.scrollHeight + "px";
+                  }}
+                  ref={(el) => { if (el) { el.style.height = "auto"; el.style.height = el.scrollHeight + "px"; } }}
+                  rows={1}
+                  className="w-full rounded-lg border border-white/10 bg-neutral-800 px-3 py-2 text-sm text-white placeholder-neutral-500 outline-none hover:border-gold/30 focus:border-gold transition-colors resize-none overflow-hidden"
                   placeholder="Текст правила..."
                 />
               )}