Astro page (src/pages/index.astro) renders the markup statically from
the shared src/logo.js defaults; interactivity lives in a bundled
client <script> that imports the same core (inlineTextShadow,
cssOutput) and wires the DOM — no framework runtime. Keeps the
accessibility markup (labels, aria, <details>/<summary>, focus rings)
and native <form> reset.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>