body {
  font-family: Arial, Helvetica, sans-serif;
  overflow-x: hidden;
  max-width: 750px;
  margin: 0 auto;
  padding-bottom: 0.5rem;
}

* {
  box-sizing: border-box;
}

a {
  text-decoration: none;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

p, h1, h2, h3, h4, h5, h6 {
  margin: 0;
  padding: 0;
}

.banner .banner {
  width: 100%;
  height: auto;
  display: block;
}

section .title {
  font-family: "Arial Narrow Bold";
  font-weight: bold;
  text-align: center;
  font-size: 22px;
  line-height: 1.5;
  color: #0049af;
}
section .text {
  font-size: 16px;
  line-height: 28px;
  color: #666;
  hyphens: auto;
}

.first-section {
  background: #0049af;
  padding: 30px 0 40px;
}
.first-section .title {
  color: #fff;
}
.first-section .text {
  color: #fff;
  text-align: center;
}
.first-section .text1 {
  margin-top: 25px;
}
.first-section .first-list1 {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  margin: 25px auto 0;
  width: 96%;
}
.first-section .first-list1 li {
  width: 47.5%;
  font-size: 16px;
  position: relative;
  color: #fff;
  background: #f9bb0b;
  text-align: center;
  padding: 10px 0;
  margin-bottom: 15px;
}
.first-section .first-list1 li b {
  font-weight: normal;
}
.first-section .first-list1 li::after {
  content: "";
  position: absolute;
  right: -30px;
  top: 50%;
  transform: translateY(-50%);
  border-bottom: 13px solid transparent;
  border-left: 20px solid #f9bb0b;
  border-right: 13px solid transparent;
  border-top: 13px solid transparent;
  box-sizing: content-box;
  display: block;
}
.first-section .first-list1 li:nth-child(2n) {
  background: #fff;
  color: #0049af;
}
.first-section .first-list1 li:nth-child(2n)::after {
  border-left: 20px solid #fff;
}
.first-section h3 {
  color: #fff;
  font-family: "Arial Narrow Bold";
  font-weight: bold;
  text-align: center;
  font-size: 18px;
  line-height: 28px;
  margin-top: 25px;
}
.first-section .text2 {
  margin-top: 15px;
}
.first-section .first-list2 {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-top: 25px;
  row-gap: 20px;
}
.first-section .first-list2 li {
  width: 48.5%;
  font-size: 16px;
  font-weight: bold;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #fff;
  text-align: center;
}
.first-section .first-list2 li img {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 10px;
}

.second-section {
  padding: 30px 0 40px;
}
.second-section .text {
  text-align: start;
}
.second-section .text b {
  color: #0049af;
  font-weight: normal;
}
.second-section .text1 {
  margin-top: 25px;
}
.second-section .second-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-top: 25px;
  row-gap: 20px;
}
.second-section .second-content .second-item {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #faf6ee;
  padding: 25px 15px;
}
.second-section .second-content .second-item h3 {
  font-size: 18px;
  color: #0149b0;
  font-weight: 600;
  text-align: center;
}
.second-section .second-content .second-item .item-list {
  width: 100%;
  padding: 20px 0px 0;
  display: flex;
  flex-direction: column;
  row-gap: 20px;
}
.second-section .second-content .second-item .item-list li {
  width: 100%;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  background: #f9bb0b;
  border-radius: 28px;
  color: #333;
  font-size: 16px;
  line-height: 28px;
  padding: 2px 5px;
}
.second-section .second-content .second-item .item-list li img {
  display: block;
  margin-right: 15px;
  width: 35px;
  height: auto;
}
.second-section .second-list {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-top: 25px;
  row-gap: 20px;
}
.second-section .second-list li {
  width: 31%;
  font-size: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #0149b0;
  border: solid 3px #f9bb0b;
  border-radius: 10px;
  padding: 15px 0;
  font-weight: 500;
  text-align: center;
}
.second-section .second-list li img {
  max-width: 50%;
  height: auto;
  display: block;
  margin-bottom: 10px;
}
.second-section .ul-title {
  color: #333;
  font-size: 18px;
  text-align: center;
  margin-top: 20px;
  font-weight: bold;
}

.third-section {
  background: #0049af;
  padding: 30px 0 40px;
}
.third-section .title, .third-section .text {
  color: #fff;
  text-align: center;
}
.third-section .text1 {
  margin-top: 25px;
}
.third-section .third-list {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-top: 20px;
  row-gap: 20px;
}
.third-section .third-list li {
  width: 18%;
  font-size: 16px;
  font-weight: bold;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #fff;
}
.third-section .third-list li p {
  font-size: 16px;
}
.third-section .third-list li .icon-box {
  width: 66px;
  height: 66px;
  border-radius: 50%;
  margin-bottom: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #fff;
  border: solid 2px #ffffff;
  position: relative;
}
.third-section .third-list li .icon-box::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -34px;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  background: url(/special/images/limestone_desulfurizer/third_icon1.png) no-repeat center center;
  background-size: 100% 100%;
}
.third-section .third-list li .icon-box img {
  max-width: 58%;
  height: auto;
}
.third-section .third-list li .icon-box .icon1 {
  display: none;
}
.third-section .third-list li .icon-box .icon2 {
  display: block;
}
.third-section .third-list li:last-child .icon-box::after {
  display: none;
}
.third-section .third-list .active .icon-box {
  background: none;
}
.third-section .third-list .active .icon-box .icon1 {
  display: block;
}
.third-section .third-list .active .icon-box .icon2 {
  display: none;
}

.fourth-section {
  padding: 30px 0 40px;
}
.fourth-section .fourth-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-top: 30px;
  row-gap: 30px;
}
.fourth-section .fourth-content .fourth-item {
  width: 100%;
  background: #faf6ee;
  padding: 30px 0;
  position: relative;
}
.fourth-section .fourth-content .fourth-item h3 {
  font-size: 18px;
  position: relative;
  text-align: center;
  font-weight: 600;
}
.fourth-section .fourth-content .fourth-item h3:hover a {
  color: #0049af;
}
.fourth-section .fourth-content .fourth-item h3 a {
  color: #333333;
}
.fourth-section .fourth-content .fourth-item h3::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -15px;
  transform: translateX(-50%);
  width: 155px;
  height: 6px;
  background: #ffc90c;
}
.fourth-section .fourth-content .fourth-item .text {
  text-align: center;
  margin-top: 5px;
}
.fourth-section .fourth-content .fourth-item .text b {
  color: #333;
}
.fourth-section .fourth-content .fourth-item .text1 {
  margin-top: 22px;
}
.fourth-section .fourth-content .fourth-item .adv-list {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-top: 15px;
  row-gap: 15px;
}
.fourth-section .fourth-content .fourth-item .adv-list li {
  width: 50%;
  color: #333;
  text-align: start;
  position: relative;
  padding-left: 20px;
  margin-top: 0;
}
.fourth-section .fourth-content .fourth-item .adv-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  background: #ffc90c;
}
.fourth-section .fourth-content .fourth-item .pro-img {
  margin: 10px auto 0;
  display: block;
  max-width: 70%;
  height: auto;
  transition: all 0.5s ease;
}
.fourth-section .fourth-content .fourth-item .pro-img:hover {
  transform: scale(1.05);
}
.fourth-section .fourth-content .fourth-item .btn-group {
  position: absolute;
  width: 100%;
  padding: 0 20px;
  bottom: 40px;
  display: flex;
  justify-content: space-between;
}
.fourth-section .fourth-content .fourth-item .btn-group a {
  width: 47.5%;
  color: #fffefe;
  background: #0049af;
  background-size: 200% auto;
  transition: background 0.5s ease;
  font-size: 16px;
  font-weight: 300;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 8px 0;
}
.fourth-section .fourth-content .fourth-item .btn-group a:hover {
  background-image: linear-gradient(to right, #0049af 10%, #a2c1ed 51%, #0049af 100%);
  background-position: center right;
}
.fourth-section .fourth-content .fourth-item .btn-group a img {
  margin-left: 10px;
  width: 25px;
  height: auto;
}
.fourth-section .fourth-content .fourth-item .btn-group a:first-child {
  background: #f9bb0b;
  background-size: 200% auto;
  transition: background 0.5s ease;
}
.fourth-section .fourth-content .fourth-item .btn-group a:first-child:hover {
  background-image: linear-gradient(to right, #f9bb0b 10%, #f0ece0 51%, #f9bb0b 100%);
  background-position: center right;
}

.fifth-section {
  background: #0049af;
  padding: 30px 0 40px;
}
.fifth-section .title {
  color: #fff;
}
.fifth-section .swiper-box {
  position: relative;
}
.fifth-section .swiper-box .swiper1 {
  margin-top: 30px;
  position: unset;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper {
  position: unset;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item {
  width: 100%;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .img-box {
  width: 100%;
  overflow: hidden;
  display: block;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .img-box img {
  display: block;
  width: 100%;
  height: auto;
  transition: all 0.5s ease;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .img-box img:hover {
  transform: scale(1.05);
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box {
  padding: 15px 20px;
  background: #fff;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box .case-title {
  font-size: 18px;
  color: #333;
  font-weight: 600;
  margin-bottom: 5px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  line-clamp: 1;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box .text {
  display: flex;
  flex-wrap: wrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  line-clamp: 1;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box .btn-group {
  margin-top: 15px;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box .btn-group a {
  font-size: 16px;
  color: #fff;
  width: 150px;
  background: #0049af;
  background-size: 200% auto;
  transition: background 0.5s ease;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 6px 0;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box .btn-group a:hover {
  background-image: linear-gradient(to right, #0049af 10%, #a2c1ed 51%, #0049af 100%);
  background-position: center right;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box .btn-group a:first-child {
  background: #f9bb0b;
  background-size: 200% auto;
  transition: background 0.5s ease;
  margin-right: 30px;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box .btn-group a:first-child img {
  margin-left: 15px;
}
.fifth-section .swiper-box .swiper1 .swiper-wrapper .swiper-slide .case-item .text-box .btn-group a:first-child:hover {
  background-image: linear-gradient(to right, #f9bb0b 10%, #f0ece0 51%, #f9bb0b 100%);
  background-position: center right;
}
.fifth-section .swiper-box .swiper-button-next, .fifth-section .swiper-box .swiper-button-prev {
  color: #fff;
  width: 40px;
  height: 40px;
  border: solid 2px #fff;
  border-radius: 50%;
}
.fifth-section .swiper-box .swiper-button-next:after, .fifth-section .swiper-box .swiper-button-prev:after {
  font-size: 18px;
  font-weight: bold;
}
.fifth-section .swiper-box .swiper-button-prev {
  opacity: 0.61;
}
.fifth-section .swiper-box .swiper-button-next {
  right: 0px;
}
.fifth-section .swiper-box .swiper-button-prev {
  left: 0px;
}

@media (max-width: 575px) {
  .container {
    max-width: 100%;
    padding: 0 15px;
  }
  section .title {
    font-size: 22px;
    line-height: 30px;
  }
  .first-section .first-list1 {
    width: 93%;
  }
  .first-section .first-list1 li {
    width: 96%;
    padding: 10px;
  }
  .first-section .first-list2 li {
    width: 48%;
  }
  .second-section .second-list li {
    font-size: 16px;
    width: 48%;
  }
  .third-section .liucheng {
    display: block;
    width: 100%;
    height: auto;
    margin-top: 20px;
  }
  .third-section .third-list {
    display: none;
  }
  .fourth-section .fourth-content .fourth-item .adv-list {
    padding: 0 40px;
  }
  .fourth-section .fourth-content .fourth-item .adv-list li {
    width: 100%;
  }
}
@media (min-width: 576px) {
  .container {
    max-width: 100%;
    padding: 0 15px;
  }
  section .title {
    font-size: 30px;
  }
  .first-section .first-list1 li {
    width: 48%;
    padding: 10px;
  }
  .third-section .liucheng {
    display: none;
  }
  .third-section .third-list {
    width: 100%;
  }
  .third-section .third-list li {
    width: 20%;
  }
  .third-section .third-list li .icon-box::after {
    right: -40px;
    width: 25px;
    height: 25px;
  }
  .fourth-section .fourth-content .fourth-item .adv-list {
    width: 95%;
    margin: 13px auto 0;
  }
  .fifth-section .swiper-box .swiper1 {
    width: 83%;
  }
}
@media (min-width: 650px) {
  .third-section .third-list {
    margin: 30px auto 0;
    width: 98%;
  }
  .third-section .third-list li .icon-box {
    width: 80px;
    height: 80px;
  }
  .third-section .third-list li .icon-box::after {
    right: -40px;
    width: 25px;
    height: 25px;
  }
}