src/components/MouseFollower.tsx

import { useEffect, useState } from 'react';
import { motion, useSpring, useMotionValue } from 'motion/react';

export default function MouseFollower() {
  const mouseX = useMotionValue(0);
  const mouseY = useMotionValue(0);

  const springConfig = { damping: 25, stiffness: 150 };
  const cursorX = useSpring(mouseX, springConfig);
  const cursorY = useSpring(mouseY, springConfig);

  const [isVisible, setIsVisible] = useState(false);
  const [isMobile, setIsMobile] = useState(true);

  useEffect(() => {
    const checkMobile = () => {
      const isTouch = ('ontouchstart' in window) || (navigator.maxTouchPoints > 0);
      setIsMobile(isTouch || window.innerWidth < 768);
    };
    checkMobile();
    window.addEventListener('resize', checkMobile);

    const handleMouseMove = (e: MouseEvent) => {
      if (isMobile) return;
      mouseX.set(e.clientX);
      mouseY.set(e.clientY);
      if (!isVisible) setIsVisible(true);
    };

    const handleMouseLeave = () => {
      setIsVisible(false);
    };

    const handleMouseEnter = () => {
      setIsVisible(true);
    };

    window.addEventListener('mousemove', handleMouseMove);
    document.addEventListener('mouseleave', handleMouseLeave);
    document.addEventListener('mouseenter', handleMouseEnter);

    return () => {
      window.removeEventListener('resize', checkMobile);
      window.removeEventListener('mousemove', handleMouseMove);
      document.removeEventListener('mouseleave', handleMouseLeave);
      document.removeEventListener('mouseenter', handleMouseEnter);
    };
  }, [mouseX, mouseY, isVisible, isMobile]);

  if (isMobile) return null;

  return (
    <>
      <motion.div
        className="fixed top-0 left-0 w-8 h-8 rounded-full border border-primary/30 pointer-events-none z-[9999] mix-blend-difference"
        style={{
          x: cursorX,
          y: cursorY,
          translateX: '-50%',
          translateY: '-50%',
          opacity: isVisible ? 1 : 0,
        }}
      />
      <motion.div
        className="fixed top-0 left-0 w-1.5 h-1.5 rounded-full bg-primary pointer-events-none z-[9999]"
        style={{
          x: mouseX,
          y: mouseY,
          translateX: '-50%',
          translateY: '-50%',
          opacity: isVisible ? 1 : 0,
        }}
      />
    </>
  );
}