.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(8, 17, 31, 0.86);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform 0.32s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow 0.32s ease;
  will-change: transform;
}

.site-header.is-hidden {
  transform: translateY(calc(-100% - 2px));
}

.site-header.is-scrolled {
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.2);
}

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