/* Smart header — always sticky, enhanced blur on scroll */

.site-header {
  transition: background-color 0.35s ease,
              border-color 0.35s ease,
              box-shadow 0.35s ease;
}

.site-header.header--visible {
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 4px 24px rgba(0,0,0,.4);
}

.site-header.header--visible::before {
  background: rgba(10, 10, 11, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

@media (prefers-reduced-motion: reduce) {
  .site-header {
    transition: none !important;
  }
}