You have a towering stack of unread books and a vacation coming up — but which ones can you realistically finish in time?

Build a single-page app where a user can:

1. **Add a book** by entering its title and total page count.
2. **Set their reading pace** — pages per day — via a simple number input or slider (default: 30 pages/day).
3. **See instantly** how many days each book will take to finish, displayed as a tidy card (e.g. "🕐 8 days").
4. **Remove books** they no longer want to track with a delete button on each card.

The list of books persists in `localStorage` so refreshing the page doesn't wipe the stack. The reading pace setting should also persist. All calculations update live whenever the pace changes — no submit button needed for recalculation.

The UI should feel clean and readable: think cozy library aesthetic, warm background tones, and clear typography. No auth, no backend — pure in-browser logic.