.problem-list {
  padding-bottom: 120px;
}
.problem-list .container {
  position: relative;
  margin: 0 auto;
      width: 85%;
      max-width: 1600px;
      padding-right: 0;
      padding-left: 0;
}
.problem-list .container::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background-color: #000;
}
.problem-list .container .box {
  position: relative;
}
.problem-list .container .box::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 2px;
  transition: all 0.4s;
  background-color: #d12733;
  z-index: 5;
}
.problem-list .container .box .box2 {
  display: flex;
  padding: 30px 40px;
  position: relative;
  cursor: pointer;
}
@media (max-width: 767px) {
  .problem-list .container .box .box2 {
    padding: 15px 20px;
  }
}
.problem-list .container .box .box2::before {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: calc(100% - 80px);
  height: 1px;
  background-color: #ddd;
}
@media (max-width: 767px) {
  .problem-list .container .box .box2::before {
    width: calc(100% - 40px);
  }
}
.problem-list .container .box .box2 .cn1 {
  width: 50px;
  color: #d12733;
  line-height: 60px;
}
@media (max-width: 767px) {
  .problem-list .container .box .box2 .cn1 {
    width: 50px;
  }
}
.problem-list .container .box .box2 .cn2 {
  width: calc(100% - 70px);
  padding-right: 20px;
  line-height: 60px;
}
@media (max-width: 767px) {
  .problem-list .container .box .box2 .cn2 {
    width: calc(100% - 20px - 50px);
  }
}
.problem-list .container .box .box2 .cn3 {
  transform: translateY(20px);
  width: 20px;
  height: 20px;
  position: relative;
}
.problem-list .container .box .box2 .cn3 em {
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: block;
  position: absolute;
  background-color: #000;
  transition: all 0.4s;
}
.problem-list .container .box .box2 .cn3 em:nth-child(1) {
  width: 18px;
  height: 2px;
}
.problem-list .container .box .box2 .cn3 em:nth-child(2) {
  width: 2px;
  height: 18px;
}
.problem-list .container .box .box3 {
  display: none;
  padding: 40px 40px 80px;
  background-color: #f8f8f8;
}
.problem-list .container .box .box3 .box3a {
  width: 68%;
}
@media (max-width: 991px) {
  .problem-list .container .box .box3 .box3a {
    width: 100%;
  }
  .problem-list .container .box .box3{padding: 20px 15px 30px;}
}
.problem-list .container .box.on::before {
  width: 100%;
}
.problem-list .container .box.on .box2 {
  background-color: #f8f8f8;
}
.problem-list .container .box.on .box2 .cn3 em:nth-child(2) {
  transform: translate(-50%, -50%) rotate(90deg);
}
.problem-list .container .box4 {
  margin-top: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.problem-list .container .box4 .cn9 {
  display: flex;
  align-items: center;
  line-height: 150px;
  color: #666;
}
.problem-list .container .box4 .cn9 img {
  margin-right:10px;
  animation: problemrotat 10s infinite;
  position: relative;
}
@keyframes problemrotat {
  from {
    transform: rotate(0);
  }
  to {
    transform: rotate(360deg);
  }
}
.public-content p{
  color: #666;
  line-height: 1.8;
}