.bb-stage { display: flex; justify-content: center; margin: 10px auto 8px; }
.bb-stage canvas { display: block; border-radius: 16px; border: 1px solid rgba(167, 139, 250, 0.35); touch-action: none; cursor: crosshair; }
.tip { text-align: center; color: var(--muted); font-size: 13px; margin: 0 0 8px; }