.banner .bg {
  background-image: url("/images/news_center/1.png");
}

.banner .banner-wrap {
  padding-bottom: 68.229%;
}

.banner .text-box {
  top: 27.18%;
}

.main {
  background-color: #000000;
  overflow: hidden;
  width: 100%;
  min-width: 320px;
}

.main .tab {
  display: flex;
  justify-content: center;
  width: 100%;
  margin: 110px 0 100px;
  font-size: 34px;
  line-height: 34px;
  position: absolute;
  bottom: 10%;
}

.main .tab .tab-item {
  cursor: pointer;
  color: #808080;
}

.main .tab .tab-item-active {
  cursor: pointer;
  color: #fff;
}

.main .tab i::after {
  content: "";
  display: block;
  width: 4px;
  height: 34px;
  margin: 0 22px;
  background: #808080;
}

.main .waterfall-city {
  margin-top: -8%;
}

.main .waterfall {
  width: 98%;
  margin: 0 auto 0;
}

.main .waterfall .list {
  width: 100%;
  text-align: center;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding-bottom: 100px;
}

.main .waterfall .list::after {
  content: "";
  width: 30%;
}

.main .waterfall .list .item {
  width: 32.8%;
  position: relative;
}

.main .waterfall .list .item:nth-child(1) .item-pic, .main .waterfall .list .item:nth-child(2) .item-pic, .main .waterfall .list .item:nth-child(3) .item-pic {
  padding-top: 0;
}

.main .waterfall .list .item .item-pic {
  width: 100%;
  height: 0;
  padding-bottom: 56.67%;
  overflow: hidden;
  transition: 1s;
  margin-top: 15px;
  position: relative;
}

.main .waterfall .list .item .item-pic:hover img {
  transform: scale(1.1);
}

.main .waterfall .list .item .item-pic .item-pic-url {
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
}

.main .waterfall .list .item .item-pic img {
  width: 100%;
  height: 100%;
}

.main .waterfall .list .item .item-pic .play-img {
  display: block;
  width: 40px;
  height: 40px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
}

.main .waterfall .list .item .item-pic .play-img:hover img {
  transform: scale(1.1);
}

.main .waterfall .list .item .mask {
  position: absolute;
  width: 100%;
  top: 50%;
  height: 50%;
  background-image: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.8));
  z-index: 1;
}

.main .waterfall .list .item .item-text {
  padding: 20px;
}

.main .waterfall .list .item .item-text h3 {
  margin-bottom: 5px;
  /* font-size: 20px; */
  color: #fff;
  text-align: left;
}

.main .waterfall .list .item .item-text p {
  color: #fff;
  text-align: left;
}

.main .more {
  padding: 60px 0 120px;
}

.main .more .more-btn {
  display: block;
  box-sizing: border-box;
  width: 15.28%;
  margin: 0 auto;
  font-size: 16px;
  line-height: 16px;
  font-weight: bold;
  color: #fff;
  text-align: center;
  padding: 16px 0;
  border: 1px solid #aaaaaa;
  cursor: pointer;
}

.video-dialog {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 999;
  display: none;
}

.video-dialog .close-btn {
  width: 50px;
  height: 50px;
  line-height: 50px;
  position: absolute;
  right: 0;
  top: 0;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  text-align: center;
  z-index: 10;
  cursor: pointer;
}

.video-dialog .close-btn i {
  font-size: 24px;
}

.video-dialog .video {
  width: 80%;
  left: 10%;
  position: absolute;
  transform: translateY(-50%);
  top: 50%;
}

@media all and (min-width: 2600px) {
  .main .tab .tab-item {
    font-size: 44px;
    line-height: 44px;
  }
  .main .tab i::after {
    height: 44px;
  }
  .main .waterfall {
    width: 1952px;
  }
  .main .waterfall .item .item-text .sup {
    font-size: 23px !important;
    line-height: 23px !important;
  }
  .main .waterfall .item .item-text h3 {
    font-size: 30px !important;
    line-height: 42px !important;
  }
  .main .waterfall .item .item-text p {
    font-size: 18px !important;
    line-height: 30px !important;
  }
  .main .more .more-btn {
    font-size: 22px;
    line-height: 22px;
  }
}

@media all and (min-width: 3840px) {
  .main .tab .tab-item {
    font-size: 55px;
    line-height: 55px;
  }
  .main .tab i::after {
    height: 55px;
  }
  .main .waterfall {
    width: 3072px;
  }
  .main .waterfall .center {
    margin-left: 186px;
  }
  .main .waterfall .item .item-text .sup {
    font-size: 33px !important;
    line-height: 33px !important;
  }
  .main .waterfall .item .item-text h3 {
    font-size: 40px !important;
    line-height: 52px !important;
  }
  .main .waterfall .item .item-text p {
    font-size: 26px !important;
    line-height: 40px !important;
  }
  .main .more .more-btn {
    font-size: 32px;
    line-height: 32px;
  }
}

@media all and (max-width: 1440px) {
  .main .tab {
    margin: 85px 0 80px;
  }
}

@media all and (max-width: 1280px) {
  .main .tab {
    margin: 65px 0 60px;
    font-size: 30px;
    line-height: 30px;
  }
  .main .waterfall .list .item .item-text h3 {
    /* font-size: 16px; */
  }
}

@media all and (max-width: 768px) {
  .main .tab {
    font-size: 18px;
    line-height: 18px;
    margin: 30px 0;
  }
  .main .tab i::after {
    height: 18px;
  }
  .main .waterfall .list {
    width: 100%;
    margin-left: 0;
  }
  .main .waterfall .list .item {
    width: 100%;
    padding: 10px 0;
  }
  .main .waterfall .list .item .item-text {
    margin-top: 10px;
    bottom: 3%;
  }
  .main .waterfall .list .item .item-text .sup {
    padding: 15px 0;
    font-size: 16px;
    line-height: 16px;
  }
  .main .waterfall .list .item .item-text h3 {
    /* font-size: 18px; */
    line-height: 26px;
  }
  .main .waterfall .list .item .item-text p {
    padding-bottom: 20px;
  }
  .main .more {
    padding: 10px 0 30px;
  }
  .main .more .more-btn {
    width: 25%;
  }
}