.ui-nav {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-sticky);
  box-sizing: border-box;
}
.ui-nav--card {
  background: var(--color-bg-card);
  border-bottom: 1rpx solid var(--color-divider);
}
.ui-nav--transparent {
  background: transparent;
}
.ui-nav__bar {
  display: flex;
  align-items: center;
  height: 88rpx;
  padding: 0 var(--spacing-2);
}
.ui-nav__back,
.ui-nav__placeholder {
  width: 64rpx;
  height: 64rpx;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.ui-nav__back-arrow {
  width: 20rpx;
  height: 20rpx;
  border-left: 4rpx solid var(--color-text-primary);
  border-bottom: 4rpx solid var(--color-text-primary);
  transform: rotate(45deg);
}
.ui-nav__title {
  flex: 1;
  text-align: center;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.ui-nav__right {
  flex-shrink: 0;
  min-width: 64rpx;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}