body {
    background-color: #fff;
  }
  .banner_section {
    position: relative;
    width: 100%;
    height: 50rem;
    background: url('../images/caseBanner.jpg') no-repeat center center;
    background-size: cover;
  }
  .banner_section .banner_mask {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.2);
  }
  .banner_section .banner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 50rem;
    position: relative;
    z-index: 4;
  }
  .banner_section .banner .banner_title {
    font-size: 4.8rem;
    color: #fff;
    font-weight: 700;
    text-align: center;
  }
  .banner_section .banner .banner_title_en {
    color: #fff;
    text-transform: uppercase;
    font-weight: 500;
    margin-top: 10px;
    font-size: 1.8rem;
    text-align: center;
  }
  .case_section {
    padding: 4rem 0;
  }
  .case_section .case_types {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
  }
  .case_section .case_types .case_type {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 12rem;
    height: 4rem;
    border-radius: 4rem;
    font-size: 1.6rem;
    margin-right: 2rem;
    background-color: #f5f5f5;
    color: #333;
    cursor: pointer;
    transition: all 0.2s linear;
  }
  .case_section .case_types .case_type:hover {
    background: linear-gradient(to top, #0a1f4f, #021262);
    color: #fff;
  }
  .case_section .case_types .case_type.active {
    background: linear-gradient(to top, #0a1f4f, #021262);
    color: #fff;
  }
  .case_section .case_list {
    display: flex;
    flex-wrap: wrap;
  }
  .case_section .case_list .case_item {
    position: relative;
    margin: 3rem 1rem 0;
    width: 23%;
    height: 19rem;
    overflow: hidden;
    cursor: pointer;
  }
  .case_section .case_list .case_item .case_item_mask {
    display: none;
    position: absolute;
    z-index: 1;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
  }
  .case_section .case_list .case_item .case_item_lines {
    width: 90%;
    height: 70%;
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 3;
    transform: translate(-50%, -50%);
  }
  .case_section .case_list .case_item .case_item_view {
    position: absolute;
    bottom: -100%;
    z-index: 5;
    right: 8rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s linear;
  }
  .case_section .case_list .case_item .case_item_view .case_item_view_name {
    color: #fff;
    font-size: 1.3rem;
    font-weight: 600;
  }
  .case_section .case_list .case_item .case_item_view .case_item_view_value {
    color: #fff;
    font-size: 1.3rem;
    font-weight: 600;
    margin: 2px 0;
  }
  .case_section .case_list .case_item .case_item_view .case_item_view_line {
    width: 1px;
    height: 8rem;
    background-color: #fff;
  }
  .case_section .case_list .case_item .case_item_like {
    position: absolute;
    bottom: -100%;
    z-index: 5;
    right: 4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s linear;
  }
  .case_section .case_list .case_item .case_item_like .case_item_view_name {
    color: #fff;
    font-size: 1.3rem;
    font-weight: 600;
  }
  .case_section .case_list .case_item .case_item_like .case_item_view_value {
    color: #fff;
    font-size: 1.3rem;
    font-weight: 600;
    margin: 2px 0;
  }
  .case_section .case_list .case_item .case_item_like .case_item_view_line {
    width: 1px;
    height: 6rem;
    background-color: #fff;
  }
  .case_section .case_list .case_item .case_item_line_top {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: #fff;
    transition: all 0.3s linear;
  }
  .case_section .case_list .case_item .case_item_line_left {
    position: absolute;
    top: 0;
    left: 0;
    width: 1px;
    height: 0;
    background-color: #fff;
    transition: all 0.3s linear;
  }
  .case_section .case_list .case_item .case_item_line_bottom {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: #fff;
    transition: all 0.3s linear;
  }
  .case_section .case_list .case_item .case_item_line_right {
    position: absolute;
    top: 0;
    right: 0;
    width: 1px;
    height: 0;
    background-color: #fff;
    transition: all 0.3s linear;
  }
  .case_section .case_list .case_item .case_item_title {
    display: none;
    position: absolute;
    bottom: 4rem;
    left: 2rem;
    color: #fff;
    font-size: 1.4rem;
    font-weight: 500;
  }
  .case_section .case_list .case_item .case_item_type {
    display: none;
    position: absolute;
    bottom: 1rem;
    left: 2rem;
    color: #fff;
    font-size: 1.2rem;
  }
  .case_section .case_list .case_item:hover .case_item_view {
    bottom: 0;
  }
  .case_section .case_list .case_item:hover .case_item_like {
    bottom: 0;
  }
  .case_section .case_list .case_item:hover .case_item_title {
    display: block;
  }
  .case_section .case_list .case_item:hover .case_item_type {
    display: block;
  }
  .case_section .case_list .case_item:hover .case_item_line_top {
    width: 100%;
  }
  .case_section .case_list .case_item:hover .case_item_line_left {
    height: 100%;
  }
  .case_section .case_list .case_item:hover .case_item_line_bottom {
    width: 100%;
  }
  .case_section .case_list .case_item:hover .case_item_line_right {
    height: 100%;
  }
  .case_section .case_list .case_item:hover .case_item_mask {
    display: block;
  }
  .case_section .case_list .case_item:hover img {
    transform: scale(1.05);
  }
  .case_section .case_list .case_item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.2s linear;
  }
  @media screen and (max-width: 900px) {
    .case_section .case_list .case_item {
      width: 45%;
      height: 26rem;
      margin-bottom: 2rem;
    }
  }
  @media screen and (max-width: 500px) {
    .case_section .case_list .case_item {
      width: 45%;
      height: 19rem;
      margin-bottom: 2rem;
    }
  }
  @media screen and (max-width: 450px) {
    .case_section .case_types .case_type {
      margin-bottom: 1rem;
    }
    .case_section .case_list .case_item {
      height: 16rem;
      margin-bottom: 1rem;
    }
  }