'use client'; import { useState, useEffect } from 'react'; export default function SimPlatformMockup() { const [isMobile, setIsMobile] = useState(false); useEffect(() => { const checkMobile = () => setIsMobile(window.innerWidth < 768); checkMobile(); window.addEventListener('resize', checkMobile); return () => window.removeEventListener('resize', checkMobile); }, []); // Simple mobile version - just the essence of cross-platform if (isMobile) { return (