.page-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: #fff;
  /* iOS 刘海屏安全区：需配合 viewport-fit=cover */
  padding-top: constant(safe-area-inset-top);
  padding-top: env(safe-area-inset-top);
}

.page-header__bar {
  position: relative;
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 16px;
}

.page-header__back {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.page-header__back svg {
  display: block;
  width: 10px;
  height: 18px;
}

.page-header__title {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  width: 60%;
  margin: 0;
  font-size: 17px;
  font-weight: 400;
  color: #000;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}