/**
 * 用户中心子页返回按钮，与 acg-detail.html .acg-detail-header .back-btn 一致
 * 需同时引入 ../assets/font/iconfont.css
 */
.back-btn {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
  box-sizing: border-box;
}

.back-btn .iconfont {
  font-size: 20px;
  color: #fff;
}

/* 返回按钮内图标：不受页面里通用 .icon 方块样式影响；无背景，在 .back-btn（flex 居中）内垂直居中 */
.back-btn > .icon.iconfont {
  background: none !important;
  border-radius: 0 !important;
  width: auto !important;
  height: auto !important;
  min-width: 0 !important;
  min-height: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
  line-height: 1;
  display: block;
}

/* 任务中心：标题居中，返回在左侧绝对定位 */
.nav-bar .back-btn {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
}