/* 顶栏第一行 + 第二行（主导航）共用背景图 */
.site-header .header-inner {
  position: relative;
  isolation: isolate;
}

.site-header-bg-layer {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-color: transparent;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

.site-header--shared-bg .site-header-bg-layer {
  display: block;
}

.site-header--shared-bg .header-row--topbar,
.site-header--shared-bg .header-topbar-tools,
.site-header--shared-bg .header-row--r3 {
  background: transparent !important;
  background-image: none !important;
}

.site-header .header-row,
.site-header .header-search-panel {
  position: relative;
  z-index: 1;
}

/* 展开搜索条：不用共用底图，保持可读纯色条 */
.site-header--shared-bg .header-search-panel {
  background: color-mix(in srgb, var(--card) 96%, transparent);
}

/* 页脚主区 + 底栏共用背景图 */
.site-footer-bg-layer {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-color: transparent;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

.site-footer--shared-bg .site-footer-bg-layer {
  display: block;
}

.site-footer--shared-bg .site-footer-main,
.site-footer--shared-bg .site-footer-bar {
  background: transparent !important;
  background-image: none !important;
}

.site-footer-main,
.site-footer-bar {
  position: relative;
  z-index: 1;
}