ungeeked/SectorScope ? reverse-engineered prompt

Build me a simple static website that helps me quickly see which Indian sectors look cheap or expensive right now based on their own past valuation history.

I want a clean dashboard with 10 NSE sector cards, sorted from cheapest to most expensive, using P/E and P/B depending on the sector. Each card should show a clear valuation band like cheap or expensive, a quick summary of how today compares with the sector’s historical median, and a small trend chart. It should also let me flip open each card or click into a detailed view with more history, EPS growth, and a few useful valuation breakdowns. Add a backtest view too, where I can pick a sector and see what happened in the past when it reached similar valuation levels, including forward 6 month and 1 year returns.

Make it work as a single HTML file with no build step, and include dark and light mode plus keyboard friendly interactions. If you need current docs or live data details, look them up online.