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Captures every decision made during the studio.html sandbox iteration so the same visual language can be applied to the rest of the app (and to new components later) without re-deriving it. Sections: - Vision + reference instruments - Lighting model (single rule: light from above) - Color tokens with semantic naming - The 3-layer "metal" language as shared CSS custom properties - Surface hierarchy (3 depth layers with progressively brighter bases) - Component anatomies: rack, bars, screen, sub-panels, knobs, faders, step LEDs, buttons, screws, engraved labels, numeric displays - Typography, spacing scale, interaction conventions - "What is intentionally NOT here" — rejected ideas to keep the language disciplined - A "how to add a new component" checklist Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>