Design a polished, shippable accessible museum guide mobile app interface. Present one main smartphone screen with a high-contrast route map, floor path, and current location, plus two neatly aligned supporting panels for large exhibit cards, step-free access indicators, audio-guide controls, type-size adjustment, and a calm visit itinerary. Use a landscape 4:3 product-design presentation with the main phone centered, consistent spacing, generous touch targets, and a clear information hierarchy. Apply a warm-white, charcoal, museum-blue, and muted-terracotta design system with crisp vector icons and restrained shadows. Use universal iconography, simple blocks, and abstract placeholder lines instead of long copy. Practical modern UI, not concept art; no gibberish text, logos, trademarks, watermark, tiny dense labels, floating holograms, inconsistent components, or distorted devices.