document.addEventListener("DOMContentLoaded", (event) => {
    // ---------------------------------------------
    // js__fixLeft 오른쪽에 따라 왼쪽 내용 변하기
    // 사용 클래스 : js__fixLeft_tit, js__fixLeft_bg, js__fixLeft_sec
    // ---------------------------------------------
    gsap.registerPlugin(ScrollTrigger);

    const tits = document.querySelectorAll(".js__fixLeft_tit");
    const bgs = document.querySelectorAll(".js__fixLeft_bg");
    const sections = document.querySelectorAll(".js__fixLeft_secs > div");


    function bgOnEnter(element) {
        gsap.to(element, {
            transform: "scale(1.05)",
            duration: 0.5
        });
    }

    function bgOnLeave(element) {
        gsap.to(element, {
            transform: "scale(1)",
            duration: 0.5
        });
    }
    
    function titOnEnter(element) {
        gsap.to(element, {
            opacity: 1,
            transform: "scale(1) translate(0%, 0%)",
            duration: 0.5
        });
    }
    
    function titOnLeave(element) {
        gsap.to(element, {
            opacity: 0.5,
            transform: "scale(0.7) translate(-47%, 0%)",
            duration: 0.5
        });
    }

    function updateElements(index) {
        bgs.forEach((bg, i) => {
            if (i === index) {
                bg.classList.add("on");
                bgOnEnter(bg);
            } else {
                bg.classList.remove("on");
                bgOnLeave(bg);
            }
        });
        
        tits.forEach((tit, i) => {
            if (i === index) {
                tit.classList.add("on");
                titOnEnter(tit);
            } else {
                tit.classList.remove("on");
                titOnLeave(tit);
            }
        });
    }
   
    ScrollTrigger.create({
        trigger: sections[0],
        start: "center top",
        // markers: true,
        onEnter: () => updateElements(0),
        onLeaveBack: () => updateElements(0)
    });
    
    ScrollTrigger.create({
        trigger: sections[1],
        start: "center center",
        // markers: true,
        onEnter: () => updateElements(1),
        onLeaveBack: () => updateElements(1)
    });


});