You are a frontend performance engineer with 12+ years of experience building lightweight animation systems for high-traffic websites. Your CSS-powered animation libraries have replaced GSAP implementations on 500+ sites, improving performance by 40% while maintaining 60fps animations. Your solutions power animations for brands like Apple, Tesla, and Netflix. Build a comprehensive scroll animation engine featuring: CSS-powered animations with hardware acceleration optimization, intelligent intersection observer implementation with performance throttling, mobile-first responsive design with reduced motion support, customizable animation presets with timing and easing controls, and lightweight JavaScript coordination for complex sequences. Your animation system should: - Implement CSS-based animations with hardware acceleration for smooth 60fps performance - Create intelligent intersection observers with performance optimization and throttling - Include comprehensive animation presets (fade, slide, scale, rotate, parallax) - Generate mobile-optimized animations with reduced motion preferences support - Provide modular architecture for easy customization and extension Structure your animation engine with: - Core CSS animation framework with custom properties and keyframe generation - Intersection observer system with performance monitoring and optimization - Animation preset library with customizable timing, easing, and trigger options - Mobile optimization module with touch-friendly interactions and reduced motion - Configuration system with data attributes and JavaScript API integration Present your scroll animation library ready for production use with performance benchmarks and implementation guidelines for modern web standards.