#act-problem-page {
  max-width: 1920px;
  margin: 0 auto;
  /* 渐变背景 */
  /* 问题标题 */
  /* 问题标题相应的内容 */
  /* 页脚 */
}
#act-problem-page .gradient-b {
  position: relative;
  height: 55px;
  background: url(../img/bg_news_title_1.png) no-repeat center center;
  z-index: 10;
}
#act-problem-page .problem-title {
  position: relative;
  height: 180px;
  overflow: hidden;
}
#act-problem-page .problem-title .bt-bg-1 {
  position: absolute;
  width: 100%;
  height: 100%;
  background: url(../img/bg_problem_title_1.png) no-repeat center center;
  animation: dot_move_1 5s ease-in-out 0s infinite alternate none running;
}
#act-problem-page .problem-title .bt-bg-2 {
  position: absolute;
  width: 100%;
  height: 100%;
  background: url(../img/bg_problem_title_2.png) no-repeat center center;
  animation: dot_move_2 3s ease-in-out 0s infinite alternate none running;
}
#act-problem-page .problem-title .bt-txt-box {
  position: absolute;
  width: 750px;
  top: 50%;
  left: 0;
  right: 700px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  transform: translateY(-50%);
}
#act-problem-page .problem-title .bt-txt-box .bt-txt {
  font-size: 28px;
  color: #999;
  font-family: '思源字体-bold';
  cursor: pointer;
  padding: 0 0 8px 37px;
}
#act-problem-page .problem-title .bt-txt-box .bt-txt.active {
  color: #594af0;
  background: url(../img/bg_nt_txt.png) no-repeat left bottom;
}
#act-problem-page .problem-content-box {
  border-top: 1px solid #eee;
  padding-top: 100px;
  margin-bottom: 170px;
}
#act-problem-page .problem-content-box .problem-content {
  max-width: 1380px;
  margin: 0 auto;
}
#act-problem-page .problem-content-box .problem-content .pc-option {
  display: flex;
  flex-wrap: wrap;
  align-content: space-between;
  border-bottom: 1px solid #ccc;
  padding: 35px 0;
  box-sizing: border-box;
  cursor: pointer;
}
#act-problem-page .problem-content-box .problem-content .pc-option .main-title-box {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
#act-problem-page .problem-content-box .problem-content .pc-option .main-title-box .main-title {
  font-family: '思源字体-bold';
  font-size: 24px;
  color: #999;
  transition: all 0.3s ease-in-out;
}
#act-problem-page .problem-content-box .problem-content .pc-option .main-title-box .drop-down-btn {
  width: 23px;
  height: 12px;
  background: url(../img/drop_down_btn.png) no-repeat;
  transition: all 0.3s ease-in-out;
}
#act-problem-page .problem-content-box .problem-content .pc-option .main-content {
  max-height: 0;
  font-size: 18px;
  line-height: 2;
  color: #999;
  overflow: hidden;
  transition: all 0.3s ease-in-out;
}
#act-problem-page .problem-content-box .problem-content:nth-of-type(1) {
  display: block;
  transition: opacity 0.5s ease-in-out;
}
#act-problem-page .problem-content-box .problem-content:nth-of-type(2) {
  display: none;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}
#act-problem-page .problem-content-box .problem-content:nth-of-type(3) {
  display: none;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}
#act-problem-page .footer {
  border-top: 1px solid #ddd;
}
@keyframes dot_move_1 {
  0% {
    transform: translate3d(0, 25px, 0) scale(1);
  }
  50% {
    transform: translate3d(0, 0, 0) scale(1.1);
  }
  100% {
    transform: translate3d(0, -25px, 0) scale(1);
  }
}
@keyframes dot_move_2 {
  0% {
    transform: translate3d(0, -50px, 0) scale(1);
  }
  50% {
    transform: translate3d(0, 0, 0) scale(1.1);
  }
  100% {
    transform: translate3d(0, -50px, 0) scale(1);
  }
}