refactor: remove DataComparisonSection from homepage to enhance layout simplicity and maintainability

app/not-found.tsx

@@ -0,0 +1,44 @@
+import Link from 'next/link'
+import { Button } from '@ciphera-net/ui'
+
+export default function NotFound() {
+  return (
+    <div className="relative min-h-[80vh] flex flex-col items-center justify-center overflow-hidden selection:bg-brand-orange/20">
+      {/* * --- ATMOSPHERE (Background) --- */}
+      <div className="absolute inset-0 -z-10 pointer-events-none">
+        {/* * Center Orange Glow */}
+        <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-[500px] h-[500px] bg-brand-orange/10 rounded-full blur-[128px] opacity-60" />
+        {/* * Grid Pattern with Radial Mask */}
+        <div 
+          className="absolute inset-0 bg-grid-pattern opacity-[0.02] dark:opacity-[0.05]"
+          style={{ maskImage: 'radial-gradient(ellipse at center, black 0%, transparent 70%)' }}
+        />
+      </div>
+
+      <div className="text-center px-4 z-10">
+        <h1 className="text-9xl font-bold text-transparent bg-clip-text bg-gradient-to-b from-neutral-900 to-neutral-500 dark:from-white dark:to-neutral-500 mb-4">
+          404
+        </h1>
+        <h2 className="text-2xl md:text-3xl font-bold text-neutral-900 dark:text-white mb-6">
+          Page not found
+        </h2>
+        <p className="text-lg text-neutral-600 dark:text-neutral-400 max-w-md mx-auto mb-10 leading-relaxed">
+          Sorry, we couldn't find the page you're looking for. It might have been moved or deleted.
+        </p>
+
+        <div className="flex flex-col sm:flex-row gap-4 justify-center items-center">
+          <Link href="/">
+            <Button className="btn-primary px-8 py-3 shadow-lg shadow-brand-orange/20">
+              Go back home
+            </Button>
+          </Link>
+          <Link href="/faq">
+            <Button variant="secondary" className="btn-secondary px-8 py-3 backdrop-blur-sm">
+              View FAQ
+            </Button>
+          </Link>
+        </div>
+      </div>
+    </div>
+  )
+}