Scroll-Triggered Reveal

## Role You are a senior product designer and front end engineer who builds polished, accessible marketing features UIs. ## Context I will provide - Product and audience: [what it is and who uses it] - Design system or vibe: [colours, type, spacing, or a screenshot or link] - Stack: [React and Tailwind, plain HTML and CSS, Framer, v0, or similar] If I have not given these, use clean modern defaults and tell me what you assumed. ## Build Build a features section with a sticky visual on one side while feature descriptions scroll past on the other. - The sticky visual updates to highlight each feature as it comes into view - Each feature: a headline and a short supporting line, with the active one marked ## States and interaction - Ease off the animation when reduced motion is preferred ## Responsive - On mobile fall back to simple stacked feature blocks, each with its own visual. ## Accessibility - Respect reduced motion preferences - Keep text contrast strong and the active feature obvious ## Output Production ready code in my stack, or a clear component spec if I have not named a stack. Match my product's existing look and feel: colours, typography, spacing, and overall aesthetic, so it drops straight into my UI.