/* 全站统一返回按钮 - 电脑端 */
.back-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 16px 0 0 20px;
}

a.back,
button.back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: #fff;
  border: 1px solid #e3e5e7;
  border-radius: 8px;
  color: #3e4146;
  font-size: .85rem;
  line-height: 1.4;
  text-decoration: none;
  box-shadow: 0 1px 3px rgba(0,0,0,.05);
  transition: all .2s;
  cursor: pointer;
  font-family: inherit;
}

a.back:hover,
button.back:hover {
  border-color: #a92122;
  color: #a92122;
  transform: translateX(-2px);
}

button.back {
  border: 1px solid #e3e5e7;
  background: #fff;
  color: #3e4146;
}

/* 电脑端顶部导航（对应手机端底部导航） */
.desktop-top-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  background: #fff;
  border-bottom: 1px solid #e3e5e7;
  position: sticky;
  top: 0;
  z-index: 1000;
}
.desktop-top-nav a.dt-home {
  color: #a92122;
  font-weight: 700;
  text-decoration: none;
  font-size: 0.9rem;
  white-space: nowrap;
}
.desktop-top-nav a.dt-home:hover {
  text-decoration: underline;
}
.desktop-top-nav .dt-title {
  color: #61666d;
  font-size: 0.85rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
@media (max-width: 768px) {
  .desktop-top-nav {
    display: none !important;
  }
}

/* 电脑端隐藏页面左上角返回区域，返回上一级收进顶部导航 */
@media (min-width: 769px) {
  .back-nav {
    display: none !important;
  }
}

/* 手机端也隐藏页面左上角返回区域，返回上一级统一由顶部黑色导航栏承担 */
@media (max-width: 768px) {
  .back-nav {
    display: none !important;
  }
}