/** * Animation / interaction styles — Whylet Design System. * * IMPORTANT — reveal safety contract: * The hidden state is scoped to `html.js`. That class is set by a tiny inline * script in BEFORE first paint. Consequences: * - JS disabled / blocked / failed -> `.js` never applied -> content is * visible by default. Content can never be trapped at opacity:0. * - JS enabled -> hidden state applies before paint, so there is no flash of * visible-then-hidden content. * This replaces the previous