@media screen and (min-width: 1201px) {
  .container {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    padding: 50px 0;
  }
  .left-nav {
    margin-right: 40px;
  }
  .left-nav .title {
    background-color: #0065b3;
    color: white;
    height: 54px;
    width: 350px;
    line-height: 54px;
    text-align: center;
    font-size: 30px;
    font-weight: bold;
  }
}
.class-list {
  padding: 15px 20px;
}
.class-list i {
  height: 20px;
  width: 20px;
  background-color: #D1D1D1;
  border-radius: 20px;
  font-size: 12px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  color: white;
}
.class-item {
  background-color: #F5F5F5;
  border: 1px solid #eaeaea;
}
.class-item.active .class-sub {
  max-height: 150px;
}
.class-item.active i {
  -webkit-transform: rotate(90deg);
          transform: rotate(90deg);
}
.class-item + .class-item {
  margin-top: 5px;
}
.class-name {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  line-height: 50px;
  padding: 0 30px;
  cursor: pointer;
}
.class-name i {
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
}
.class-sub {
  max-height: 0;
  overflow: hidden;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
}
.class-sub a {
  display: block;
  line-height: 40px;
  padding: 0 30px;
  font-size: 14px;
  text-indent: 16px;
}
.info {
  border: 1px solid #F5F5F5;
  padding: 20px;
}
.info .tel {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  margin-bottom: 30px;
}
.info .tel img {
  height: 42px;
  width: auto;
  margin-right: 24px;
}
.info .tel p {
  margin-bottom: 10px;
  font-size: 19px;
}
.info .tel a {
  font-size: 28px;
  color: #0065b3;
}
.info-name {
  font-size: 21px;
  font-weight: bold;
  margin-bottom: 15px;
}
.info-desc div {
  padding: 10px 0;
}
.info-desc div + div {
  border-top: 1px dotted #d5d5d5;
}
.content {
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
}
.case-list {
  display: grid;
  gap: 40px;
  grid-template-columns: repeat(1, 1fr);
  padding-bottom: 60px;
}
.case-item {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-shadow: 0 0 15px 2px rgba(0, 0, 0, 0.2);
          box-shadow: 0 0 15px 2px rgba(0, 0, 0, 0.2);
  padding: 30px;
}
.case-item .img {
  width: 330px;
  height: 240px;
  margin-right: 50px;
}
.case-item img {
  height: 100%;
  width: 100%;
}
.case-info {
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
}
.case-title {
  font-size: 26px;
  margin-bottom: 30px;
}
.case-desc {
  font-size: 18px;
  color: #666;
  margin-bottom: 30px;
  line-height: 30px;
}
.case-data {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 30px;
  color: #666;
}
.case-data span::before {
  margin-right: 5px;
}
@media screen and (max-width: 1200px) {
  .case-list {
    gap: 20px;
    padding: 20px;
  }
  .case-item {
    width: 100%;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    padding: 10px;
    -webkit-box-shadow: none;
            box-shadow: none;
    border: 1px solid #ddd;
  }
  .case-item .img {
    width: 100%;
    height: initial;
    margin-right: 0;
  }
  .case-item img {
    height: auto;
  }
  .case-title {
    font-size: 18px;
    padding: 10px 0;
    line-height: 1.2;
    margin-bottom: 0;
  }
  .case-desc {
    font-size: 12px;
    line-height: 20px;
    margin-bottom: 10px;
  }
  .case-data span {
    font-size: 12px;
  }
  .pagination {
    margin-bottom: 50px;
  }
}