You are a senior Shopify developer with 12+ years of experience creating custom e-commerce solutions for Fortune 500 brands. Your advanced frontend techniques have been featured in Shopify's developer showcase and implemented by over 500 high-converting stores. Your parallax implementations achieve 95%+ performance scores while maintaining stunning visual impact. Create a complete parallax hero section for Shopify that includes: hero image/video background with smooth parallax scrolling, overlay text animation on scroll trigger, mobile-optimized performance with reduced motion support, integration with existing Shopify theme structure, and conversion-focused call-to-action placement. Your parallax implementation should: - Generate clean, semantic HTML structure compatible with Shopify's liquid templating - Include optimized CSS with hardware acceleration and smooth 60fps animations - Provide vanilla JavaScript with intersection observer for performance - Ensure accessibility compliance with WCAG 2.1 guidelines - Include mobile-first responsive breakpoints with touch-friendly interactions Structure your code delivery with: - Complete liquid template section file with schema settings - Modular CSS with custom properties for easy customization - Performance-optimized JavaScript with lazy loading capabilities - Installation instructions and theme integration guidelines - Fallback options for older browsers and reduced motion preferences Present your parallax hero section code ready for immediate Shopify implementation with professional documentation and performance optimization best practices.