@supports (animation-timeline:scroll()){header[data-app-header]:after{content:"";inset-inline:0;background:var(--color-border-primary);pointer-events:none;height:1px;animation:linear both app-header-line;animation-timeline:scroll(root);animation-range:calc(100vh - 96px) calc(100vh - 64px);position:absolute;bottom:0}}@keyframes app-header-line{0%{opacity:0}to{opacity:1}}