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- Add useIsMobile hook (768px breakpoint with matchMedia) - Add BottomSheet component (swipe up/down, optional tabs, handle bar) - Add MobileTabBar component (bottom nav with icons + labels) - Sandbox mobile: compact toolbar, hamburger menu, action bar with START button, bottom sheet with module grid tiles - World Map mobile: compact header, single-column level list, bottom tab bar (JUEGO/SANDBOX/CONFIG) - Puzzle View mobile: icon-only top bar buttons, sidebar replaced by bottom sheet with 3 tabs (MISION/OBJETIVOS/MODULOS) - ~200 lines of CSS media queries: touch targets 44px, port dots 18px, zoom controls larger, modals full-width, level complete full-width buttons Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>