/* Glass-style header: translucent background with backdrop blur */
.main-header .header-sticky{
  background: rgba(255,255,255,0.6);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.2);
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 9999;
}
/*.navbar-brand img{*/
/*    filter:brightness(1.5);*/
/*}*/

@media (prefers-color-scheme: dark){
  .main-header .header-sticky{
    background: rgb(255, 255, 255);
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
}

/* Slightly stronger style when scrolled (if JS toggles .scrolled) */
.main-header .header-sticky.scrolled{
  background: rgba(255,255,255,0.85);
  box-shadow: 0 6px 18px rgba(0,0,0,0.06);
}