/* Small vanilla-JS helpers. Main visual system lives in site.css. */
[hidden]{display:none!important}
#lesson-overlay{position:fixed;inset:0;z-index:40;background:color-mix(in oklab,var(--color-bg) 60%,transparent)}
.to-top-simple{font-family:var(--font-display);font-size:1.5rem;line-height:1}