Import source: cshare-app/src/hooks/useScrollReveal

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

cshare-app/src/hooks/useScrollReveal.js

@@ -0,0 +1,30 @@
+import { useEffect, useRef } from 'react';
+
+export function useScrollReveal(threshold = 0.15) {
+  const ref = useRef(null);
+
+  useEffect(() => {
+    const el = ref.current;
+    if (!el) return;
+
+    const children = el.querySelectorAll('.scroll-reveal');
+    if (children.length === 0) return;
+
+    const observer = new IntersectionObserver(
+      (entries) => {
+        entries.forEach((entry) => {
+          if (entry.isIntersecting) {
+            entry.target.classList.add('revealed');
+            observer.unobserve(entry.target);
+          }
+        });
+      },
+      { threshold, rootMargin: '0px 0px -40px 0px' }
+    );
+
+    children.forEach((child) => observer.observe(child));
+    return () => observer.disconnect();
+  }, [threshold]);
+
+  return ref;
+}