site 1.6.0 (local): four mods stable, the rest experimental; builder ticks all and warns

- Stable: extended BPM, boot text, LED animation, cue colours; every other mod
  experimental (main page, docs, builder).
- Builder: every mod ticked at the start; a red warning across the top: for
  home use, not for clubs or gigs.
- Intro: the emulator links to QEMU.

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

style.css

@@ -561,3 +561,11 @@ footer .legal { margin-top: 14px; font-size: .85rem; }
 .picks { transition: max-height .3s ease, opacity .25s ease; max-height: 8000px; }
 .picks.collapsed { max-height: 0; opacity: 0; overflow: hidden; margin: 0; pointer-events: none; }
 @media (prefers-reduced-motion: reduce) { .picks { transition: none; } }
+
+/* builder: the warning across the top */
+.warnbar {
+  margin: 22px 0 26px; padding: 14px 18px; border-radius: 8px;
+  background: #b3141b; color: #fff; border: 1px solid #e0343b; font-size: .98rem; line-height: 1.45;
+  box-shadow: 0 0 0 1px rgba(0,0,0,.2), 0 8px 24px rgba(179,20,27,.25);
+}
+.warnbar strong { font-family: var(--display); letter-spacing: .02em; text-transform: uppercase; margin-right: .4em; }