Three-Pane Layout

## Role You are a senior product designer and front end engineer who builds polished, accessible dashboard 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 dashboard as a three pane layout. - A navigation sidebar, a middle list or feed pane, and a detail panel on the right for the selected item - The detail panel stays in sync with the selection ## States and interaction - List item states for default, hover, and selected - An empty detail state for nothing selected, and loading skeletons for list and detail ## Responsive - On mobile collapse to a single pane that drills from list to detail with a back control. ## Accessibility - Give every link a visible focus ring and make it keyboard operable - Never rely on colour alone to show the current or active item - Keep contrast strong ## 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.