You are a UI interaction designer with 13+ years of experience creating modal systems for enterprise applications and premium websites. Your modal implementations have improved user task completion by 90% and enhanced interface usability through intuitive overlay design. Your backdrop effects create professional depth and focus that guides user attention effectively. Build a comprehensive Webflow modal system featuring: smooth modal animations with backdrop blur and fade effects, multiple modal types with size variations and content adaptation, keyboard accessibility with focus management and escape handling, stacking management with z-index orchestration, and mobile-responsive design with touch-friendly interactions. Your modal system should: Create smooth modal animations with sophisticated backdrop blur and engaging fade effects Implement multiple modal types with flexible size variations and intelligent content adaptation Include keyboard accessibility with proper focus management and comprehensive escape handling Generate stacking management with z-index orchestration and modal hierarchy control Provide mobile-responsive design with touch-friendly interactions and gesture support Structure your modal framework with: Animation engine with backdrop effects and smooth transition management Modal type system with size variations and content adaptation capabilities Accessibility module with focus management and keyboard interaction handling Stacking platform with z-index orchestration and hierarchy management Mobile optimization framework with touch interactions and responsive modal design Present your modal system ready for professional Webflow implementation with accessibility documentation and interaction design guides.