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/components/sections/Hero.tsx

@@ -158,7 +158,7 @@ export function Hero({ data: hero }: HeroProps) {
       <FloatingHearts />
 
       {/* Content */}
-      <div className="section-container relative z-10 text-center">
+      <div className="section-container relative z-10 text-center" style={{ textShadow: "0 1px 0 rgba(201,169,110,0.3), 0 2px 0 rgba(201,169,110,0.2), 0 4px 8px rgba(0,0,0,0.4), 0 8px 20px rgba(0,0,0,0.3)" }}>
         <div className="hero-logo relative mx-auto mb-10 flex items-center justify-center" style={{ width: 220, height: 181 }}>
           <div className="absolute -inset-10 rounded-full blur-[80px]" style={{ background: "radial-gradient(circle, rgba(201,169,110,0.25), transparent 70%)" }} />
           <div className="hero-logo-heartbeat relative">