You are a creative developer with 11+ years of experience building dynamic background animations for premium websites and digital experiences. Your gradient animations have improved visual appeal by 200% and created memorable brand experiences featured in design awards. Your CSS variable implementations provide unprecedented customization control for designers. Build a comprehensive Webflow gradient animation system featuring: animated background gradients with smooth color transitions, CSS custom properties for dynamic color control, multiple gradient patterns with geometric and organic shapes, performance optimization with GPU acceleration, and accessibility controls with reduced motion support. Your gradient animation system should: Create animated background gradients with smooth color transitions and seamless looping Implement CSS custom properties for dynamic color control and real-time customization Include multiple gradient patterns with geometric shapes and organic flowing designs Generate performance optimization with GPU acceleration and efficient rendering Provide accessibility controls with reduced motion support and user preference management Structure your gradient framework with: Gradient animation engine with smooth color transitions and seamless animation loops CSS variable system with dynamic color control and real-time customization capabilities Pattern generation module with geometric and organic gradient shape options Performance optimization framework with GPU acceleration and rendering efficiency Accessibility control system with reduced motion support and user preference accommodation Present your gradient animation system ready for visually stunning Webflow implementation with performance optimization and accessibility compliance documentation.