Lightning is a production-grade UI framework for building rich, hardware-accelerated applications, primarily targeting TV and embedded platforms. It provides a component-based architecture with a hierarchical render tree, dual rendering backends (WebGL and Canvas2D), a CSS-like flexbox layout engine, a keyframe animation and transition system, texture management with caching and async loading, and an extensive shader library for visual effects. The framework is designed for portability and performance, with support for remote control, mouse, and touch input, as well as bidirectional text and accessibility features. Key entry points include the Application and Component base classes, the Stage orchestrator, and the Element tree. External dependencies are limited to browser/WebGL APIs and platform-specific optimizations, making it suitable for cross-platform deployment.