.site-header{position:fixed;inset:0 0 auto;z-index:40;background:transparent;border-bottom:1px solid transparent;box-shadow:none;transition:background-color .24s ease,border-color .24s ease,box-shadow .24s ease}
.site-header.is-scrolled{background:var(--ink-deep);border-bottom-color:rgba(255,255,255,.12);box-shadow:0 8px 24px rgba(8,25,23,.13)}