/* pentagrid hero (home): no-WebGL fallback in the verdigris ramp only (#38493F / #212822 on --ground), no brass, no rust.
   Ported from afc00b6 (where it was appended to signature.css); kept separate so signature.css stays byte-identical. */
.sig-canvas[data-pentagrid][data-sig-state="fallback"]{background:radial-gradient(70% 80% at 72% 42%,rgba(56,73,63,.55),transparent 60%),radial-gradient(100% 100% at 30% 80%,rgba(33,40,34,.6),transparent 70%)}