.nav-link-underline:after{content:"";background-color:var(--color-primary);transform-origin:100%;block-size:2px;inline-size:100%;transition:transform .3s ease-in-out;position:absolute;inset-block-end:-3px;inset-inline-start:0;transform:scaleX(0)}.nav-link-underline:hover:after,.nav-link-underline-active:after{transform-origin:0;transform:scaleX(1)}