/* IE浏览器样式 */
.container {
  margin: 0 auto;
  width: 100%;
  max-width: 1920px;
}
.header {
  width: 100%;
  position: relative;
  z-index: 1;
}
.content {
  width: 70%;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.mr2 {
  margin-right: 2%;
}
.item {
  width: 100%;
  margin: 40px 0;
  overflow: hidden;
}
.item-header {
  text-align: center;
  margin: 30px auto;
  width: 50%;
}
.item-header img {
  width: 100%;
  display: block;
}
/* item1样式 */
.item1 .i-slider1 {
  position: relative;
  width: 100%;
  margin: 0 auto;
}
.item1 .i-slider1 .sliderInner {
  position: relative;
  overflow: hidden;
}
.item1 .i-slider1 .sliderInner ul {
  width: 100%;
}
.item1 .i-slider1 .sliderInner,
.item1 .i-slider1 .sliderInner li {
  width: 100%;
  height: 343px;
  overflow: hidden;
}
.item1 .i-slider1 .sliderInner li {
  float: left;
}
.item1 .i-slider1 .img-box {
  float: left;
  overflow: hidden;
  margin-right: 50px;
}
.item1 .i-slider1 .img-box,
.item1 .i-slider1 .img-box img {
  display: block;
  width: 600px;
  height: 343px;
}
.item1 .i-slider1 .list-text {
  overflow: hidden;
  padding-top: 40px;
}
.item1 .i-slider1 .list-tit {
  width: 100%;
  height: 72px;
  overflow: hidden;
  font-size: 24px;
  line-height: 36px;
  font-weight: 700;
}
.item1 .i-slider1 .list-tit a {
  display: block;
}
.item1 .i-slider1 .list-desc {
  color: #4b4b4b;
  font-size: 18px;
  line-height: 24px;
  margin-top: 15px;
}
.item1 .i-slider1 .slider-cur {
  position: absolute;
  bottom: 50px;
  left: 50%;
  z-index: 100;
}
.item1 .i-slider1 .swiper-pagination-switch {
  display: inline-block;
  width: 12px;
  height: 12px;
  font-size: 0;
  line-height: 0;
  border: 1px solid #777;
  border-radius: 50%;
  margin-right: 10px;
  cursor: pointer;
}
.item1 .i-slider1 .swiper-active-switch {
  border-color: #2998d5;
  background-color: #2998d5;
}
/* item3样式 */
.item3 .i-slider3 {
  position: relative;
  width: 100%;
  margin: 0 auto;
}
.item3 .i-slider3 .sliderInner {
  position: relative;
  overflow: hidden;
}
.item3 .i-slider3 .sliderInner ul {
  width: 100%;
}
.item3 .i-slider3 .sliderInner,
.item3 .i-slider3 .sliderInner li {
  width: 100%;
  height: 343px;
  overflow: hidden;
}
.item3 .i-slider3 {
  position: relative;
  padding: 0 80px;
  width: 100%;
}
.item3 .i-slider3 .sliderInner li {
  float: left;
}
.item3 .i-slider3 .img-box {
  float: left;
  overflow: hidden;
  margin-right: 50px;
}
.item3 .i-slider3 .img-box,
.item3 .i-slider3 .img-box img {
  display: block;
  width: 600px;
  height: 343px;
}
.item3 .i-slider3 .list-text {
  overflow: hidden;
  padding-top: 40px;
}
.item3 .i-slider3 .list-tit {
  width: 100%;
  height: 72px;
  overflow: hidden;
  font-size: 24px;
  line-height: 36px;
  font-weight: 700;
}
.item3 .i-slider3 .list-tit a {
  display: block;
}
.item3 .i-slider3 .list-desc {
  color: #4b4b4b;
  font-size: 18px;
  line-height: 24px;
  margin-top: 15px;
}
.item3 .i-slider3 .swiper-button-prev,
.item3 .i-slider3 .swiper-button-next {
  position: absolute;
  top: 50%;
  width: 60px;
  height: 60px;
  margin-top: -30px;
  cursor: pointer;
  z-index: 100;
  background-size: 100% 100%;
  opacity: 0.8;
  transition: opacity 0.3s;
}
.item3 .i-slider3 .swiper-button-prev:hover,
.item3 .i-slider3 .swiper-button-next:hover {
  opacity: 1;
}
.item3 .i-slider3 .swiper-button-prev {
  background-image: url(../images/left.png);
  left: 0;
}
.item3 .i-slider3 .swiper-button-next {
  background-image: url(../images/right.png);
  right: 0;
}

/* item2样式 */
.item2 ul {
  width: 100%;
  overflow: hidden;
  zoom: 1;
  clear: both;
  /* padding: 20px; */
  text-align: center;
}
.item2 ul li {
  display: inline-block;
  width: 31%;
  vertical-align: top;
  text-align: left;
}
.item2 ul li a {
  display: block;
}
.item2 ul li img {
  display: block;
  width: 100%;
}
.item2 ul li p {
  margin: 10px 0;
  padding: 0 10px;
  color: #4b4b4b;
  font-size: 18px;
}

/* item4 样式 */
.item4 ul {
  overflow: hidden;
  zoom: 1;
  clear: both;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
}
.item4 ul li {
  float: left;
  width: 50%;
  position: relative;
  overflow: hidden;
}
.item4 ul li a {
  display: block;
  position: relative;
}
.item4 ul li img {
  display: block;
  width: 100%;
  height: 400px;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.item4 ul li .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0);
  transition: background-color 0.3s ease;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -moz-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -moz-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
}
.item4 ul li .overlay-content {
  text-align: left;
  color: #fff;
  padding: 20px;
  transform: translateY(20px);
  transition: transform 0.3s ease;
  opacity: 0;
}
.item4 ul li .overlay-content h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.4;
}
.item4 ul li .overlay-content p {
  font-size: 16px;
  line-height: 1.6;
}
.item4 ul li:hover .overlay {
  background-color: rgba(0, 0, 0, 0.5);
}
.item4 ul li:hover .overlay-content {
  transform: translateY(0);
  opacity: 1;
}
.item4 ul li:hover img {
  transform: scale(1.05);
}
.footer {
  text-align: center;
  padding: 20px;
  background-color: #6cb4a9;
}
.footer p {
  font-size: 18px;
  color: #fff;
}

/* ==================== 回到顶部按钮 ==================== */
.scroll-to-top {
  position: fixed;
  bottom: 15%;
  right: 5%;
  width: 50px;
  height: 50px;
  background: #a7a7a7;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  z-index: 1000;
  text-align: center;
  line-height: 50px;
}

.scroll-to-top.show {
  opacity: 1;
  visibility: visible;
}

.scroll-to-top:hover {
  background-color: #cfcfcf;
}

.scroll-to-top:active {
  background-color: #999;
}

.scroll-to-top img {
  width: 30px;
  height: 30px;
  vertical-align: middle;
  margin-top: -8px;
}