export function isMobileDevice(): boolean {
  if (typeof window === 'undefined') return false;

  const hasTouch = 'ontouchstart' in window || navigator.maxTouchPoints > 0;
  const isMobileWidth = window.innerWidth < 768;
  const mobileRegex = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i;
  const isMobileUA = mobileRegex.test(navigator.userAgent);

  return (hasTouch && isMobileWidth) || isMobileUA;
}