.w {
  padding: 0;
  margin: 0 auto;
}
.btn {
  transition: all 0.5s;
}
.banner {
  height: 500px;
  margin-bottom: 72px;
  background-color: #28292b;
}
.banner .banner-box {
  margin-top: 120px;
  width: 100%;
  height: 500px;
  overflow: hidden;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.2);
  position: relative;
}
.banner .banner-box .banner-list li {
  width: 100%;
  height: 500px;
  float: left;
  background-size: cover;
  background-position: center;
  cursor: pointer;
  position: relative;
}
.banner .banner-box .banner-list li .title-box {
  width: 1200px;
  margin: 0 auto;
  padding: 0 46px;
  position: relative;
}
.banner .banner-box .banner-list li .title-box .title1 {
  margin-top: 106px;
  font-size: 48px;
  letter-spacing: 8px;
  line-height: 1;
  font-weight: bold;
}
.banner .banner-box .banner-list li .title-box .title2 {
  margin-top: 26px;
  font-size: 20px;
  letter-spacing: 3px;
  line-height: 1;
}
.banner .banner-box .banner-list li .title-box .title3 {
  margin-top: 66px;
  font-size: 24px;
  letter-spacing: 4px;
  line-height: 1;
}
.banner .banner-box .banner-list li .title-box .btn-info {
  width: 204px;
  height: 60px;
  border-radius: 30px;
  font-size: 24px;
  color: #fff;
  background-color: #93c1fe;
  letter-spacing: 4px;
}
.banner .banner-box .banner-list li .btn-wrap {
  position: absolute;
  left: 50%;
  margin-left: -600px;
  bottom: 55px;
}
.banner .banner-box .banner-list li .btn-wrap .btn-info {
  margin-left: 46px;
  width: 204px;
  height: 60px;
  border-radius: 30px;
  font-size: 24px;
  color: #fff;
  background-color: #93c1fe;
  letter-spacing: 4px;
}
.banner .banner-box .banner-list li .title-box1 {
  color: #3788fe;
}
.banner .banner-box .banner-list li .title-box2 {
  color: #3daebb;
}
.banner .banner-box .banner-list li .title-box3 {
  color: #316bc9;
}
.banner .banner-box .banner-list li:nth-child(2) .btn-info {
  transition: none;
  margin-top: 102px;
}
.banner .banner-box .banner-list li:nth-child(3) .btn-info {
  background-color: #62bdc8;
  margin-top: 75px;
}
.banner .banner-box .banner-list li:nth-child(4) .btn-info {
  background-color: #f2f5e4;
  color: #316bc9;
  margin-top: 86px;
}
.banner .banner-box .circle-list {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
}
.banner .banner-box .circle-list li {
  width: 14px;
  height: 14px;
  float: left;
  border-radius: 50%;
  margin-right: 30px;
  background: rgba(179, 179, 179, 0.8);
  cursor: pointer;
}
.banner .banner-box .circle-list li.on {
  background-color: #fff;
}
.banner .banner-box .circle-list li:last-child {
  margin-right: 0;
}
.content .w {
  width: 1140px;
}
.content .form-select {
  display: inline-block;
  z-index: 5;
  width: 360px;
  height: 66px;
  line-height: 66px;
  position: relative;
  font-size: 18px;
  cursor: pointer;
  margin-right: 24px;
  box-shadow: 0px 0px 5px rgba(41, 41, 41, 0.14);
}
.content .form-select .form-select-title {
  padding-left: 10px;
  color: #353637;
  background: #fff;
}
.content .form-select .icon-arr {
  width: 12px;
  height: 6px;
  position: absolute;
  top: 30px;
  right: 32px;
  transform-origin: center center;
  transition: transform 0.2s;
  background: url("../img/icon-arr-black.png") no-repeat center;
}
.content .form-select .form-select-list {
  box-shadow: 0px 0px 5px rgba(41, 41, 41, 0.14);
  background: #fff;
  position: absolute;
  top: 67px;
  left: 0;
  width: 100%;
}
.content .form-select .form-select-list li {
  height: 52px;
  line-height: 52px;
  padding-left: 10px;
  color: #565858;
}
.content .form-select .form-select-list li:hover {
  color: #fff;
  background-color: #229ddd;
}
.content .form-select:last-child {
  margin-right: 0;
}
.content .form-select.active .form-select-title {
  color: #51b0e3;
}
.content .form-select.active .icon-arr {
  transform: rotate(180deg);
}
.content .case-list {
  margin-top: 56px;
}
.content .case-list li {
  float: left;
  width: 360px;
  margin-right: 26px;
  background: #fff;
  margin-bottom: 70px;
  box-shadow: 0px 0px 5px rgba(41, 41, 41, 0.14);
}
.content .case-list li .case-cover {
  height: 165px;
}
.content .case-list li .case-content {
  padding-left: 12px;
  padding-top: 14px;
  height: 214px;
  position: relative;
}
.content .case-list li .case-title {
  font-size: 14px;
  color: #000;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.content .case-list li .case-tags {
  margin-top: 12px;
  margin-bottom: 20px;
  color: #979595;
  font-size: 14px;
}
.content .case-list li .case-tags span {
  width: 76px;
  display: inline-block;
  height: 24px;
  margin-right: 12px;
  line-height: 22px;
  border-radius: 5px;
  text-align: center;
  border: 1px solid #c3c3c3;
}
.content .case-list li .case-des {
  height: 90px;
  color: #565858;
  font-size: 12px;
  line-height: 16px;
}
.content .case-list li .btn-add {
  width: 30px;
  height: 30px;
  line-height: 24px;
  border-radius: 50%;
  color: #0772fc;
  font-size: 24px;
  border: 1px solid #0772fc;
  position: absolute;
  bottom: 40px;
  right: 10px;
  cursor: pointer;
  text-align: center;
}
.content .case-list li .btn-add:hover {
  color: #fff;
  background: #0772fc;
}
.content .case-list li .case-number {
  color: #0772fc;
  font-size: 16px;
  text-align: center;
}
.content .case-list li:nth-child(3n) {
  margin-right: 0px;
}
.content .btn-info {
  width: 264px;
  height: 78px;
  line-height: 78px;
  text-align: center;
  display: block;
  color: #fff;
  border: 1px solid #3788fe;
  border-radius: 40px;
  margin: 40px auto 202px;
  font-size: 24px;
  background-color: #3788fe;
  letter-spacing: 2px;
}
.banner-bottom {
  background: url("../img/case-bottom.jpg") no-repeat center;
  height: 140px;
  font-size: 36px;
  color: #fff;
  line-height: 140px;
}
.banner-bottom .w {
  width: 1308px;
}
.banner-bottom p {
  padding-left: 372px;
  text-align: left;
  letter-spacing: 8px;
}
.banner-bottom .btn {
  margin-right: 134px;
  width: 136px;
  height: 36px;
  line-height: 34px;
  border: 1px solid #fff;
  border-radius: 18px;
  color: #fff;
  float: right;
  font-size: 20px;
  margin-top: 50px;
  background: transparent;
}
.banner-bottom .btn:hover {
  background: #fff;
  color: #229ddd;
}
@media screen and (max-width: 1400px) {
}