* {
  padding: 0;
  margin: 0;
}

ul li {
  list-style: none;
}

a {
  text-decoration: none;
}

.mid-container {
  max-width: 1123px;
  box-sizing: border-box;
  margin: 0 auto;
}

/* 头部导航样式 */
.header-container {
  background-color: #00579a;
  height: 40px;
  position: fixed;
  z-index: 100;
  top: 0;
  width: 100%;
}

.top-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  height: 100%;
}

.top-nav-list {
  overflow: hidden;
  color: #fff;
  display: flex;
  justify-content: flex-start;
}

.top-nav-list li a {
  font-size: 14px;
  color: #fff;
}

.separated {
  margin: 0 10px;
}

/* 侧边导航 */
.catalog-wrp {
  position: absolute;
  left: auto;
  right: 48px;
}

.catalog {
  position: fixed;
  top: 150px;
  margin-left: 48px;
  padding-left: 16px;
  border-left: 2px solid rgba(0, 0, 0, 0.05);
}

.catalog-item .catalog-link {
  padding: 6px 0;
  display: block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: rgba(0, 0, 0, 0.9);
  font-size: 15px;
}

/* 选中时*/
.catalog-index {
  position: absolute;
  left: -2px;
  border-left: 2px solid #00579a;
  height: 36px;
  top: 0;
  transition: top 0.2s;
}

.catalog-link.current {
  color: #00579a;
}

/* 内容样式 */
.content {
  padding: 96px 164px;
  max-width: 1123px;
  box-sizing: border-box;
  margin: 0 auto;
  position: relative;
  font-size: 17px;
}
.content_body_wrap {
  position: relative;
}

.content_body_wrap img {
  width: 45%;
  margin-right: 5px;
}

.section-title {
  /* 让页面滚动跳转时目标内容不会在最顶部 */
  margin-top: -80px;
  padding-top: 120px;
  font-size: 1.5em;
}
p {
  margin: 24px 0;
}
h3,
h4 {
  margin: 24px 0;
}

@media screen and (max-width: 1024px) {
  .content {
    padding: 96px 88px;
  }
  .catalog-wrp {
    display: none;
  }
}

@media screen and (max-width: 768px) {
  .content {
    padding: 96px 24px;
  }
  .top-bar {
    margin-right: 20px;
  }
}