/* 头部整体改为上下结构：Logo 居中、导航在下 */
.pkp_structure_head .pkp_head_wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.pkp_site_name {
  display: flex;
  justify-content: center;
  width: 100%;
  margin: 0.5rem 0;
}

.pkp_site_name .is_img img {
  display: block;
  height: auto;
  max-height: 80px;      /* 视你的 Logo 视觉效果调整 */
  max-width: 90%;
  margin: 0 auto;
}

/* 让主导航居中（可选） */
.pkp_navigation_primary_wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
}