/* V159 — Fail-closed admin visibility guard. */
#adminNavBtn[hidden],
html:not([data-admin-authorized="true"]) #adminNavBtn{
  display:none!important;
  visibility:hidden!important;
  pointer-events:none!important;
}
html[data-admin-authorized="true"] #adminNavBtn{
  visibility:visible!important;
  pointer-events:auto!important;
}