.problem-1 {
  padding-top: 1.4rem;
  padding-bottom: 1.2rem;
}
.problem-1 .page {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}
@media (max-width: 900px) {
  .problem-1 .pbm-11 {
    width: 100%;
  }
  .problem-1 .pbm-12 {
    width: 100%;
    margin-top: 0.5rem;
  }
}
.pbm-11 {
  width: 19.6428571429%;
}
.pbm-11 .nav {
  position: sticky;
  top: 1rem;
}
.pbm-11 .nlist {
  padding: 0.3rem 0.2rem;
  background-color: #fff;
  border-radius: 0.2rem;
}
.pbm-11 .li {
  margin-bottom: 0.1rem;
}
.pbm-11 .li:last-child {
  margin-bottom: 0;
}
.pbm-11 .aa {
  display: block;
  padding: 0.24rem 0.2rem;
  border-radius: 0.1rem;
}
.pbm-11 .aa:hover, .pbm-11 .aa.on {
  background-color: #f2f2f2;
  color: #007bff;
}

.pbm-12 {
  width: 77.380952381%;
}
.pbm-12 .list .li {
  margin-bottom: 0.1rem;
  border-radius: 0.1rem;
  overflow: hidden;
}
.pbm-12 .list .li.show .hd {
  background-color: #007bff;
  color: #fff;
}
.pbm-12 .list .li.show .num {
  background-color: #fff;
  color: #007bff;
}
.pbm-12 .list .li.show .btn {
  background-image: url(/static/home/images/icon-4.png);
}
.pbm-12 .list .hd {
  display: flex;
  align-items: center;
  position: relative;
  padding: 0.23rem 0.3rem;
  background-color: #fff;
  cursor: pointer;
  -webkit-user-select: none;
     -moz-user-select: none;
          user-select: none;
}
.pbm-12 .list .num {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 2.125em;
  height: 2.125em;
  border-radius: 50%;
  background-color: #007bff;
  color: #fff;
  font-weight: 600;
  flex-shrink: 0;
  margin-right: 0.3rem;
}
.pbm-12 .list .bd {
  background-color: #fff;
  display: none;
}
.pbm-12 .list .bte {
  color: #666;
  line-height: 2;
  padding: 0.42rem 1rem 0.5rem;
  text-align: justify;
}
.pbm-12 .list .btn {
  width: 0.24rem;
  height: 0.24rem;
  border-radius: 1rem;
  background-color: #f2f2f2;
  position: absolute;
  top: 50%;
  right: 0.3rem;
  transform: translateY(-50%);
  background-image: url(/static/home/images/icon-3.png);
  background-repeat: no-repeat;
  background-size: 41.6666666667% auto;
  background-position: center;
}
.pbm-12 .btns {
  text-align: center;
  margin-top: 0.6rem;
}
.pbm-12 .btns .more {
  display: inline-flex;
  align-items: center;
  color: #007bff;
  box-shadow: 0 0 0 1px #007bff inset;
  line-height: 1;
  padding: 0 0.4rem;
  height: 0.5rem;
  border-radius: 1rem;
  cursor: pointer;
  border: none;
  transition: all 0.3s;
}
.pbm-12 .btns .more:hover {
  background-color: #007bff;
  color: #fff;
}
.pbm-12 .btns .more:hover .ic {
  filter: brightness(0) invert(1);
}
.pbm-12 .btns .ic {
  width: 1em;
  height: 1em;
  margin-left: 0.5em;
  transform: rotate(90deg);
  background-image: url(/static/home/images/icon-1.png);
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}
@media (max-width: 900px) {
  .pbm-12 .list .bte {
    padding: 0.3rem;
  }
}