Enhance background effects with new subtle animations and layers, including noise, particles, and wave lines. Update global styles for improved grid perspective and animation timing. Add YouTube URL validation to direct download API.

app/page.tsx

@@ -123,6 +123,10 @@ export default function Home() {
       {/* Animated background */}
       <div className="animated-bg" />
       
+      <div className="bg-noise" />
+      <div className="bg-particles" />
+      <div className="bg-wave-lines" />
+      
       <div 
         className="fixed inset-0 z-[-2] pointer-events-none transition-transform duration-1000 cubic-bezier(0.1, 0.8, 0.2, 1)"
         style={{