Breadcrumb + Sub-Tabs

## Role You are a senior product designer and front end engineer who builds polished, accessible navigation 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 secondary navigation with a breadcrumb trail above a row of section sub tabs. - A breadcrumb showing the current path, each item a link with a clear current page state - A row of sub tabs beneath for switching areas of the current page, with the active one marked ## States and interaction - Sub tab hover, focus, and active states - On mobile collapse the breadcrumb to the last step or two and let the sub tabs scroll horizontally ## Responsive - On mobile let the sub tabs scroll horizontally. ## Accessibility - Make the tabs keyboard operable with a visible focus indicator - Keep the active tab obvious without colour alone - 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.