/* banner */
.banner {
  height: 358px;
  background: url(../img/about/b_5d11b80370c2a.png) no-repeat center;
  background-size: 100% 358px;
}
.banner .banner_box {
  background-color: rgba(0, 81, 169, 0.3);
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}
.banner .banner_box h1 {
  font-size: 50px;
  font-weight: 500;
  color: #FFFFFF;
  line-height: 80px;
  text-shadow: 0px 0px 8px rgba(0, 0, 0, 0.5);
}
.banner .banner_box h2 {
  font-size: 36px;
  font-weight: 500;
  color: #FFFFFF;
  line-height: 80px;
  text-shadow: 0px 0px 8px rgba(0, 0, 0, 0.5);
}
/* 分类 */
.classification {
  height: 70px;
  background: #fff;
}
.classification .classification_box {
  width: 1200px;
  margin: 0 auto;
}
.classification .classification_box ul {
  display: flex;
  align-items: center;
}
.classification .classification_box ul li {
  margin-right: 27px;
  color: #333333;
  font-size: 20px;
  padding: 0 20px;
  display: block;
  line-height: 68px;
  border-bottom: 2px solid #fff;
  cursor: pointer;
}
.classification .classification_box ul li:hover {
  color: #007AFF;
  border-color: #007AFF;
}
.classification .classification_box ul .active {
  color: #007AFF;
  border-color: #007AFF;
}
/* 案例展示 */
.case_view {
  padding: 30px 0;
}
.case_view .case_view_box {
  width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}
.case_view .case_view_box .case {
  width: 590px;
  height: 439px;
  background: #FFFFFF;
  margin-bottom: 20px;
  cursor: pointer;
}
.case_view .case_view_box .case div:nth-of-type(1) {
  width: 100%;
  height: 332px;
  overflow: hidden;
}
.case_view .case_view_box .case div:nth-of-type(1) img {
  min-height: 332px;
  width: 100%;
}
.case_view .case_view_box .case div:nth-of-type(2) {
  padding: 20px;
}
.case_view .case_view_box .case div:nth-of-type(2) h2 {
  font-size: 26px;
  font-weight: 500;
  color: #333333;
  overflow: hidden;
  /*文本超出隐藏*/
  text-overflow: ellipsis;
  /*文本超出显示省略号*/
  white-space: nowrap;
  /*超出的空白区域不换行*/
}
.case_view .case_view_box .case div:nth-of-type(2) p {
  margin-top: 10px;
  width: 550px;
  color: #666666;
  word-break: break-all;
  text-overflow: ellipsis;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
}
/* 动画  放大 缩小 */
@keyframes narrow {
  0% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes enlarge {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.2);
  }
}