줌인이 왜 안되는지를 모르겠어요..

(() => {
    const leaflet = document.querySelector(".leaflet");
    const pageElems = document.querySelectorAll(".page");
    let pageCount = 0;

    function getTarget(elem, className){ //부모노드까지 위임
        while(!elem.classList.contains(className)){
            elem = elem.parentNode;

            if(elem.nodeName =='BODY'){
                elem = null;
                return;
            }
        }
        return elem;
    }


    function closeLeaflet(){
        pageCount=0;
        document.body.classList.remove('leaflet-opened');
        pageElems[2].classList.remove('page-flipped');
        setTimeout(() => {
            pageElems[0].classList.remove('page-flipped');
        },500);
    }

    function zoomIn(elem){
        const rect = elem.getBoundingClientRect();
		const dx = window.innerWidth/2 - (rect.x + rect.width/2);
        const dy = window.innerHeight/2 - (rect.y + rect.height/2);
        let angle;
        switch(elem.parentNode.parentNode.parentNode.dataset.page*1){
            case 1:
                angle = -30;
                break;
            case 2:
                angle = 0;
                break;
            case 3:
                angle =30;
                break;
        }
        console.log(elem.parentNode.parentNode.parentNode.dataset.page);
        leaflet.style.transform = `translate3d(${dx}px, ${dy}px, 50vw) rotateY(${angle}deg)`;
    }

    leaflet.addEventListener('click',e =>{
        let pageElem = getTarget(e.target, 'page');
        if(pageElem){
            pageElem.classList.add('page-flipped');
            pageCount++;
            if(pageCount ==2){
                document.body.classList.add('leaflet-opened');
            }
        }

        let closeBtnElem = getTarget(e.target, 'close-btn');

        if(closeBtnElem){
            closeLeaflet();
        }
        
        let menuItemElem = getTarget(e.target, 'menu-item');
        if(menuItemElem){
            zoomIn(menuItemElem);
        }
    });
})();