Night Grid cyberpunk style guide

Spec, stylesheet, glitch script, Claude Code skill and the design
canvas source.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

night-grid.js

@@ -0,0 +1,15 @@
+// Night Grid: glitch one random .ng-glitch element every 6–14s (~10s average).
+(() => {
+  if (matchMedia('(prefers-reduced-motion: reduce)').matches) return;
+  const next = () => setTimeout(tick, 6000 + Math.random() * 8000);
+  const tick = () => {
+    const els = document.querySelectorAll('.ng-glitch');
+    const el = els[Math.floor(Math.random() * els.length)];
+    if (el) {
+      el.classList.add('is-glitching');
+      el.addEventListener('animationend', () => el.classList.remove('is-glitching'), { once: true });
+    }
+    next();
+  };
+  next();
+})();