.three_unit ul li {
  width: 15% !important;
}

.case_list_box {
  padding: 100px 0 120px 0;
  box-sizing: border-box;
}

.case_list ul li a {
  position: relative;
  display: flex;
  justify-content: space-between;
  padding: 40px 60px;
  box-sizing: border-box;
  box-shadow: 2px 2px 3px rgba(63, 142, 77, 0.2);
}

.case_list ul li a .l {
  width: 35%;
}

.case_list ul li a .l .p_box img {
  display: block;
  max-width: 100%;
}

.case_list ul li a .l .p_box {
  position: relative;
}

.case_list ul li a .l .p_box .zz {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(69, 153, 79, 0);
  z-index: 1;
}

.case_list ul li a:hover .l .p_box .zz {
  background-color: rgba(69, 153, 79, 0.5);
  transition: all 0.6s;
}

.case_list ul li a .r {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 60%;
}

.case_list ul li a .r span {
  line-height: 40px;
}

.case_list ul li a .r p {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #3F8E4D;
}

.case_list ul li a .r p::after {
  content: " ";
  display: block;
  width: 80%;
  height: 2px;
  background: #3F8E4D;
}

.arrow_btnbox {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 120px;
  height: 120px;
  color: #fff;
  font-size: 30px;
  background-image: url(../image/case/椭圆\ 2.png);
  background-position: center center;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  opacity: 0;
}

.case_list ul li a:hover .arrow_btnbox {
  opacity: 1;
  transition: all 0.6s;
}

.case_list ul li {
  margin: 0 0 60px 0;
}

@media screen and (max-width: 1680px) {
  .three_unit {
    margin: 50px 0 0 0;
  }

  .three_unit ul li a {
    padding: 30px 0;
  }

  .case_list_box {
    padding: 90px 0 110px 0;
  }

  .case_list ul li a {
    padding: 30px 50px;
  }

  .case_list ul li a .r h4 {
    font-size: 18px;
  }

  .case_list ul li a .r span {
    font-size: 14px;
    line-height: 35px;
  }

  .case_list ul li {
    margin: 0 0 50px 0;
  }

    .arrow_btnbox {
      width: 110px;
      height: 110px;
    }
}

@media screen and (max-width: 1600px) {
  .three_unit {
    margin: 40px 0 0 0;
  }

  .three_unit ul li a {
    padding: 20px 0;
  }

  .case_list_box {
    padding: 80px 0 100px 0;
  }

  .case_list ul li a {
    padding: 20px 40px;
  }

  .case_list ul li a .r h4 {
    font-size: 16px;
  }

  .case_list ul li a .r span {
    line-height: 30px;
  }

  .case_list ul li a .r p {
    font-size: 14px;
  }

  .three_unit ul li a::before {
    height: 30px;
  }

  .case_list ul li {
    margin: 0 0 40px 0;
  }

         .arrow_btnbox {
           width: 100px;
           height: 100px;
         }
}

@media screen and (max-width: 1440px) {
  .three_unit {
    margin: 30px 0 0 0;
  }

  .three_unit ul li a {
    padding: 15px 0;
  }

  .case_list_box {
    padding: 70px 0 90px 0;
  }

  .case_list ul li a {
    padding: 15px 30px;
  }

  .case_list ul li a .r span {
    line-height: 25px;
  }

  .case_list ul li {
    margin: 0 0 30px 0;
  }

         .arrow_btnbox {
           width: 90px;
           height: 90px;
         }
}

@media screen and (max-width: 1366px) {
  .three_unit {
    margin: 20px 0 0 0;
  }

  .case_list_box {
    padding: 60px 0 80px 0;
  }

  .case_list ul li a {
    padding: 15px 20px;
  }

  .case_list ul li a .r span {
    line-height: 20px;
  }

  .case_list ul li {
    margin: 0 0 20px 0;
  }

             .arrow_btnbox {
               width: 80px;
               height: 80px;
             }
}

@media screen and (max-width: 1280px) {
  .three_unit {
    margin: 15px 0 0 0;
  }

  .case_list_box {
    padding: 50px 0 70px 0;
  }

  .case_list ul li a .r span {
    line-height: 20px;
  }

  .three_unit ul li a {
    font-size: 14px;
  }

  .case_list ul li {
    margin: 0 0 15px 0;
  }

             .arrow_btnbox {
               width: 70px;
               height: 70px;
             }
}

@media screen and (max-width: 1024px) {
  .case_list_box {
    padding: 40px 0 60px 0;
  }

  .case_list ul li a .r span {
    line-height: 20px;
  }

                .arrow_btnbox {
                  width: 60px;
                  height: 60px;
                }
}

@media screen and (max-width: 980px) {
  .case_list_box {
    padding: 30px 0 50px 0;
  }

  .case_list ul li a .r span {
    line-height: 1.5;
  }

  .three_unit ul li {
    margin: 0 0 15px 0;
    width: 30% !important;
  }

  .three_unit ul {
    flex-wrap: wrap;
  }

  .three_unit ul {
    justify-content: space-around !important;
  }

  .case_list ul li a .l,
  .case_list ul li a .r {
    width: 100%;
  }

  .case_list ul li a {
    flex-wrap: wrap;
  }

  .case_list ul li a .l .p_box img {
    margin: 0 auto;
  }

  .case_list ul li a .l {
    margin: 0 0 15px 0;
  }

  .case_list ul li a .r span {
    display: block;
    margin: 15px 0;
  }

            .arrow_btnbox {
              width: 50px;
              height: 50px;
            }
}

@media screen and (max-width: 768px) {
  .case_list_box {
    padding: 20px 0 40px 0;
  }

  .case_list ul li a .r span {
    line-height: 1.3;
  }
}

@media screen and (max-width: 640px) {
  .case_list_box {
    padding: 15px 0 30px 0;
  }

  .three_unit ul li {
    width: 50% !important;
  }
}

@media screen and (max-width: 375px) {}