swiper slide text fadein animation

<div class="swiper mySwiper">
  <div class="swiper-wrapper">
    <div class="swiper-slide" style="background-image: url();">
      <h1 class="lviewa" data-swiper-animation="fadeIn" data-duration="1.2s" data-delay="0.5s">
        aaaaaa
      </h1>
    </div>
    <div class="swiper-slide" style="">
      <h1 class="lviewa" data-swiper-animation="fadeIn" data-duration="1.2s" data-delay="0.5s">
        bbbbb
      </h1>
    </div>
    <div class="swiper-slide" style="">
      <h1 class="lviewa" data-swiper-animation="fadeIn" data-duration="1.2s" data-delay="0.5s">
        cccc
      </h1>
    </div>
  </div>
  <div class="swiper-button-next"></div>
  <div class="swiper-button-prev"></div>
  <div class="swiper-pagination"></div>
</div>


<style>
  
  	    .swiper {
      width: 100%;
      height: 800px;
    }

    .swiper-slide {
      text-align: center;
      font-size: 18px;
      background: #fff;
      display: flex;
      justify-content: center;
      align-items: center;
      background-size: cover;
    }

    .swiper-slide img {
      display: block;
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: 50% 10%;
      
    }

    .swiper-button-next, .swiper-button-prev {
        color: white;
        font-size: 4.5em;
        font-weight: 700;
        opacity: 0;
        visibility: hidden;
    }

    .mySwiper:hover .swiper-button-prev,
    .mySwiper:hover .swiper-button-next {
        opacity: 1;
        visibility: visible;
    }

    .swiper-pagination {
        font-size: 2em;
        bottom: 30px;
    }

    .swiper-pagination-bullet {
        width: 12px; 
        height: 12px; 
        border-radius: 50%;
    }
  
  
  
    /* 기본 상태 - 요소가 보이지 않도록 설정 */
    .lviewa {
        visibility: hidden;
        opacity: 0;
        transition: visibility 0s, opacity 1.2s ease-out;
        color: white;
        font-size: 3rem;
        font-weight: bold;
    }

    /* Swiper에 의해 활성화되었을 때 fadeIn 애니메이션 적용 */
    .swiper-slide-active .lviewa[data-swiper-animation="fadeIn"] {
        visibility: visible;
        opacity: 1;
        transition: visibility 0s linear 0.5s, opacity 1.2s ease-out 0.5s;
    }
</style>