Step 6.2 Complete — Museum Gallery reference exhibit and Contract 5.3 spec

test-fixtures/reference-exhibits/museum-gallery/style.css

@@ -0,0 +1,77 @@
+/* Museum Gallery — domain styling only. Layout and controls come from the shell. */
+
+body {
+  background: #14100a;
+  color: #f2e9da;
+}
+
+.exhibit-header {
+  background: linear-gradient(90deg, rgba(150, 110, 40, 0.3), rgba(255, 255, 255, 0.03));
+  border-color: rgba(220, 180, 110, 0.25);
+}
+
+.exhibit-header h1 { color: #f0d9a8; }
+
+.stage {
+  border-color: rgba(220, 180, 110, 0.25);
+  box-shadow: inset 0 0 60px rgba(50, 35, 10, 0.7);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  text-align: center;
+  padding: 24px;
+}
+
+.gallery-display {
+  max-width: 420px;
+}
+
+.gallery-display .artifact-name {
+  font-size: 22px;
+  font-weight: 600;
+  letter-spacing: 0.03em;
+  color: #f0d9a8;
+  margin: 0 0 10px;
+}
+
+.gallery-display .readout-row {
+  font-size: 13px;
+  opacity: 0.8;
+  margin: 4px 0;
+}
+
+.gallery-display .surface-status {
+  margin-top: 18px;
+  font-size: 11px;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  opacity: 0.6;
+}
+
+.gallery-display .surface-status.is-waiting {
+  color: #ffcf7a;
+  opacity: 1;
+}
+
+.panel { background: rgba(150, 110, 40, 0.14); border-color: rgba(220, 180, 110, 0.2); }
+.panel h2 { color: #e0bf7d; }
+
+input[type="range"] { accent-color: #d9a441; }
+
+button {
+  background: rgba(217, 164, 65, 0.12);
+  border-color: rgba(220, 180, 110, 0.35);
+  color: #f2e9da;
+}
+
+button:hover { background: rgba(217, 164, 65, 0.24); }
+button:disabled { opacity: 0.4; cursor: not-allowed; }
+
+select {
+  background: rgba(30, 20, 8, 0.85);
+  border-color: rgba(220, 180, 110, 0.3);
+}
+
+.exhibit-footer { background: rgba(150, 110, 40, 0.14); border-color: rgba(220, 180, 110, 0.2); }
+.exhibit-footer .announcement-label { color: #e0bf7d; opacity: 0.7; }
+.exhibit-header .status { color: #e0bf7d; }