#banner {
  position: relative;
}

.banner-pic-box {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.banner-pic-box .pic-box.on {
  z-index: 2;
}

.banner-pic-box .pic-box {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}

.banner-tip-box {
  position: absolute;
  left: 0;
  right: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 2;
}
.banner-tip-box .tip-box {
  float: left;
  width: 16.6666%;
  height: 100%;
  position: relative;
  display: block;
}
.banner-tip-box .mark {
  position: absolute;
  top: 0;
  left: 0;
  right: 1px;
  bottom: 0;
  background: rgba(125, 125, 125, .5);
  transition: all .3s linear;
}
.banner-tip-box .cont {
  height: 60px;
  line-height: 60px;
  font-size: 20px;
  position: absolute;
  top: 50%;
  left: 30px;
  right: 30px;
  margin-top: -30px;
  color: #fff;
}
.banner-tip-box .border {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 50px;
  background-color: #fff;
}


.banner-tip-box .on .mark {
  background-color: transparent;
}

.banner-tip-box .on .cont {
  color: #333;
}
.banner-tip-box .on .border {
  background-color: #333;
}

.group-list {
  margin-top: 30px;
}

.grid-box {
  overflow: hidden;
  margin-left: -10px;
  position: relative;
}

.grid-item {
  margin-left: 10px;
  width:  calc(50% - 10px);
  float: left;
  margin-bottom: 15px;
}

.group-item-box {
  /* height: 760px; */
}
.group-item-box .img-box {
  height: 540px;
  overflow: hidden;
  position: relative;

}
.group-item-box .cont-box {
  padding: 20px;
  background: #f1f1f1;
  color: #999;
}

.group-item-box .cont-box .title {
  font-size: 20px;
}

.group-item-box .cont-box .title p {
  margin-top: 5px;
}

.group-item-box .cont-box .desc {
  height: 80px;
  font-size: 15px;
  line-height: 1.6em;
  padding-top: 10px;
  overflow: hidden;
}

.group-list {
  display: none;
}

@media screen and (max-width: 1400px) {
 .group-item-box .img-box {
   height: 472px;
 }
}


@media screen and (max-width: 1200px) {
  .group-item-box .img-box {
    height: 405px;
  }
}

@media screen and (max-width: 1000px) {
  .group-item-box .img-box {
    height: 337px;
  }
  .group-item-box .cont-box .desc {
    height: 70px;
  }
}

@media screen and (max-width: 750px) {
  #banner {
    display: none;
  }
  .group-list {
    display: block;
  }
  .banner-tip-box .border {
    display: none;
  }
  .banner-tip-box .cont {
    line-height: 1.5em;
    text-align: center;
  }
  .grid-box {
    margin-left: 0;
  }
  .grid-item {
    margin-left: 0;
    float: none;
    width: 100%;
    margin-bottom: 15px;
  }
  /* .group-item-box {
    height: 380px;
  } */
  .group-item-box .img-box {
    height: 250px;
  }
}

@media screen and (max-width: 440px) {
  .group-item-box .cont-box .desc {
    height: 70px;
  }
}