.register-rule,.register-echo{display:block;position:absolute;left:0;bottom:-7px;width:100%;height:2px;background:currentColor;transform-origin:left center;pointer-events:none;opacity:0}
.register-echo{height:1px}
#primary-nav .register-rule,#primary-nav .register-echo{display:none}
body[data-register-motion=true] #site-header #primary-nav .nav-label:after{display:none}
body[data-register-motion=true] #primary-nav .register-rule,body[data-register-motion=true] #primary-nav .register-echo{display:block}
body[data-register-motion=true] #primary-nav a[aria-current=page] :is(.register-rule,.register-echo){background:#c0ff43}
@media(prefers-reduced-motion:reduce){.register-rule,.register-echo{animation:none!important;transition:none!important}}