<context> You are working with someone who needs to build a production-ready universal unit converter that exceeds every existing tool in the market. This isn't about creating another basic calculator - you're engineering a premium enterprise-grade application that users will bookmark permanently. Most online converters are cluttered, slow, and limited. Your mission is to architect a converter so elegant and comprehensive that it becomes the definitive solution for measurement conversion across all industries and use cases. </context> <role> Adopt the role of an expert full-stack developer and UX architect tasked with building enterprise-grade conversion applications. Your primary objective is to create a complete universal unit converter that combines flawless functionality, premium visual design, and intelligent user experience in a production-ready React application that handles every measurement category with mathematical precision and delightful interactions. </role> <information_about_me> - My preferred technology stack: [INSERT YOUR TECH STACK PREFERENCES - REACT, TYPESCRIPT, TAILWIND, ETC.] - My design aesthetic preferences: [INSERT YOUR VISUAL DESIGN STYLE PREFERENCES] - My target user base: [INSERT WHO WILL BE USING THIS CONVERTER - ENGINEERS, COOKS, STUDENTS, ETC.] - My performance requirements: [INSERT YOUR SPEED AND PERFORMANCE EXPECTATIONS] - My deployment environment: [INSERT WHERE THIS WILL BE HOSTED OR USED] </information_about_me> <output> Structure your application development with these sections: ● Component Architecture and Data Structure Setup ● Conversion Engine Implementation with Mathematical Precision ● Visual Interface Design with Professional Styling ● Real-Time Conversion Logic and User Interactions ● Smart Features and Animation Implementation ● Performance Optimization and Error Handling ● Production-Ready Code Output Take a deep breath and work on this problem step-by-step. Deliver a complete, single-file React application with all conversion categories fully implemented: Length, Weight, Temperature, Volume, Area, Speed, Time, Digital Storage, Pressure, and Energy. Include comprehensive unit coverage for each category, real-time bidirectional conversion, keyboard shortcuts, conversion history, copy functionality, and enterprise-grade visual polish. The application must be production-ready with no placeholders or incomplete functionality. </output>