.product-article {
  --backgroud-color: #f5f5f7;
  --red-primary-current: #9b0d0d;
  padding: 19rem 16rem 13.7rem 23.6rem;
  background-color: var(--backgroud-color);
  display: flex;
  align-items: flex-start;
  font-family: "SourceHanSansCN-Medium";
}
/* 侧边 */
.aside-nav {
  width: 27.7rem;
  position: sticky;
  top: 10rem; /* header的高度 */
}
.nav-hide {
  height: 0;
  overflow: hidden;
  margin: 0;
}
.aside-title {
  font-size: 2.2rem;
  line-height: 4.2rem;
  font-family: "SourceHanSansCN-Bold";
  font-weight: normal;
  color: #323232;
  cursor: pointer;
}
.nav-list {
  margin-top: 0.5rem;
  display: flex;
}
.nav-slider {
  width: 1px;
  background: #D9D9D9;
  margin-right: 3.6rem;
}
.slider-bar {
  width: 0.4rem;
  height: 3.7rem;
  border-radius: 1rem;
  background-color: var(--red-primary);
  transition: transform 0.3s ease-in-out;
}
.nav-item {
  font-size: 2rem;
  line-height: 4.2rem;
  color: #00000080;
  cursor: pointer;
  transition: color 0.3s ease-in-out;
}
.nav-item:hover,
.nav-item--active {
  color: #1D1D1FF2;
}
.expand-line {
  color: var(--red-light-1);
  font-size: 2rem;
  margin-top: 10px;
}
.expand-line svg {
  width: 2rem;
  height: 1.5rem;
  margin-left: 8px;
  vertical-align: middle;
}
/* 主要部分 */
.main-content {
  flex: 1;
  margin-left: 12rem;
  font-size: 2rem;
}
.main-title {
  color: var(--red-primary-current);
  font-weight: normal;
  font-size: 3.6rem; 
  margin-bottom: 4.9rem;
}
.mce-container h2, 
.mce-container h3,
.mce-container h4{
  color: var(--red-primary-current);
  font-weight: normal;
  margin-bottom: 3.4rem;
}
.mce-container img {
  max-width: 100%;
  object-fit: contain;
}
.mce-container a {
  color: #0066cc;
}
@media (max-width: 1280px) {
  .product-article {
    padding: 60px 50px;
    flex-direction: column;
  }
  .main-content {
    margin-left: 0;
    width: 100%;
    margin-top: 10rem;
  }
  .aside-nav {
    width: 100%;
    background-color: var(--white-primary);
    border-radius: 8px;
    padding: 20px 34px;
  }
  .aside-title {
    font-size: clamp(14px, 3rem, 3rem);
    line-height: clamp(20px, 5rem, 5rem);
  }
  .nav-list {
    margin-top: 10px;
  }
  .nav-item {
    font-size: 2.5rem;
    line-height: 5rem;
  }
  .nav-hide {
    margin: 0;
  }
}
@media (max-width: 767px) { 
  .product-article {
    padding: 30px 20px;
  }
  .main-content {
    margin-top: 3rem;
  }
  .aside-nav {
    top: 3rem;
    padding: 10px 20px;
  }
  .aside-title {
    font-size: 14px;
    line-height: 20px;
  }
  .nav-item {
    font-size: 12px;
    line-height: 25px;        
  }
  .nav-slider {
    margin-right: 10px;
  }
  .slider-bar {
    width: 4px;
    height: 20px;
  }
  .expand-line {
    margin-top: 10px;
    font-size: 12px;
  }
  .expand-line svg {
    width:10px;
    height: 5px;
  }
  .main-title {
    margin-bottom: 2.5rem;
    font-size: 20px;
    line-height:31px;
  }
}