.content_subtitle {
  font-size: 20px;
  color: #666;
  margin-bottom: 20px;
}
.product .title {
  font-size: 36px;
  color: #000;
  text-align: center;
  margin-bottom: 25px;
  line-height: 1;
  font-weight: normal;
}

.product:nth-child(4) {
  margin-bottom: 110px;
  padding-top: 0;
}

.product .content_title {
  font-size: 26px;
}

.product .content_info {
  font-size: 20px;
  color: #999999;
  margin: 10px 0 40px;
  padding-left: 2em;
}

.product .margin_bottom_10 {
  margin-bottom: 10px;
}

.product .content_info a {
  color: #999999;
}

.product .content_info a:hover {
  color: #2f80ed;
}

.product .tablist {
  width: 100%;
  box-sizing: border-box;
  margin: 0 auto 32px;
  position: relative;
  border-radius: 3px;
}

.product .tablist .tab {
  width: 25%;
  text-align: center;
  font-size: 24px;
  padding: 8px 0;
  box-sizing: border-box;
  cursor: pointer;
  background-color: #ffffff;
  color: #999;
  float: left;
  transition: color 0.3s ease-in;
  -ms-transition: color 0.3s ease-in;
  -moz-transition: color 0.3s ease-in;
  -webkit-transition: color 0.3s ease-in;
  -o-transition: color 0.3s ease-in;
}

.product .tablist .active {
  width: 22px;
  height: 2px;
  background-color: #02bcb5;
  position: absolute;
  top: -1px;
  border-radius: 2px;
}

.product .tablist .tab_line {
  width: 100%;
  height: 1px;
  position: absolute;
  left: 0;
  bottom: 0;
  background-color: #dddddd;
}

.product .tablist .tab:hover {
  color: #02bcb5;
}

.product .tablist .active_text {
  color: #02bcb5;
}

.product .tabcontent {
  width: 85%;
  margin: 28px auto 0;
}

.product .tabcontent .toggle {
  font-size: 26px;
  color: #333333;
  line-height: 47px;
  padding-bottom: 10px;
  margin-top: 32px;
  border-bottom: 1px solid #eaeaea;
  cursor: pointer;
}

.product .tabcontent .arrow {
  width: 24px;
  height: 24px;
  margin-top: 12px;
  transition: transform 0.3s ease-in;
  -ms-transition: transform 0.3s ease-in;
  -moz-transition: transform 0.3s ease-in;
  -webkit-transition: transform 0.3s ease-in;
  -o-transition: transform 0.3s ease-in;
  transform: rotate(-180deg);
  -ms-transform: rotate(-180deg);
  -moz-transform: rotate(-180deg);
  -webkit-transform: rotate(-180deg);
  -o-transform: rotate(-180deg);
}

.product .tabcontent .active_arrow {
  transform: rotate(0);
}

.product .tabcontent .video_content {
  padding-top: 13px;
  margin-left: 38px;
}

.product .tabcontent .video_title {
  color: #999999;
  line-height: 32px;
  font-size: 18px;
}

.product .tabcontent .video_title a {
  color: #666;
  text-decoration: none;
}

.product .tabcontent .video_title a:hover {
  color: #2f80ed;
  text-decoration: underline;
}

.product .tabcontent iframe {
  margin-bottom: 23px;
}

.cases-hero {
  background: linear-gradient(135deg, #00d5cc 0%, #00b4ab 100%);
  color: white;
  padding: 60px 20px;
  text-align: center;
}

.cases-hero h1 {
  font-size: 32px;
  margin-bottom: 16px;
}

.cases-hero p {
  font-size: 18px;
  opacity: 0.95;
}