"use client"; import { useEffect, useState } from "react"; export default function Footer() { const [isTop, setIsTop] = useState(true); useEffect(() => { const onScroll = () => setIsTop(window.scrollY <= 0); onScroll(); window.addEventListener("scroll", onScroll, { passive: true }); return () => window.removeEventListener("scroll", onScroll); }, []); return ( ); }