Layer 2 (peripheral): reduce peak alpha 0.55→0.38, noise 0.1→0.05, taper noise to zero near clear boundary for a clean gradient edge. Layer 3 (deep fog): reduce alpha range 0.78-0.90→0.62-0.76 so zone temperature tint breathes through. Layer 5 unchanged (alpha 1.0). Ticket: #564 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>