/*
 * Header surface isolation (flat glass).
 *
 * The video Ambilight is intentionally allowed to bloom around the player,
 * but the global navigation header uses the same neutral glass as the left
 * sidebar drawer: translucent black + backdrop blur, flat colour surface.
 * There is no bottom fade and no horizontal colour gradient.
 *
 * Dark theme only — light theme keeps its own white glass (index.css).
 */
html:not(.theme-light) header[class*="z-[10003]"],
html:not(.theme-light) #root header[class*="z-[10003]"] {
  position: absolute;
  background: rgba(0, 0, 0, 0.8) !important;
  background-color: rgba(0, 0, 0, 0.8) !important;
  background-image: none !important;
  border-bottom-color: rgba(255, 255, 255, 0.1) !important;
  box-shadow: none !important;
  -webkit-backdrop-filter: blur(36px) !important;
  backdrop-filter: blur(36px) !important;
  isolation: isolate !important;
  overflow: visible;
}

/* Keep the same flat glass on compact/mobile headers. */
@media (max-width: 767px) {
  html:not(.theme-light) header[class*="z-[10003]"],
  html:not(.theme-light) #root header[class*="z-[10003]"] {
    background: rgba(0, 0, 0, 0.8) !important;
    background-color: rgba(0, 0, 0, 0.8) !important;
    background-image: none !important;
    border-bottom-color: rgba(255, 255, 255, 0.1) !important;
    box-shadow: none !important;
    -webkit-backdrop-filter: blur(36px) !important;
    backdrop-filter: blur(36px) !important;
  }
}