Show HN: A Save Data Calculator for the Roguelike Gacha Chaos Zero Nightmare

I kept messing up Save Data calculations in Chaos Zero Nightmare and losing important rewards at the end of runs, so I built a small mobile-friendly calculator to track everything properly.

It runs well on a phone while the game is open on PC and handles tier caps automatically.

Built with Vite + Tailwind.

Feedback welcome: https://www.cznsavedata.com