Nice challenge—just remember that secrecy doesn’t have to feel like a security guard at a concert. Use subtle opacity fades or a light overlay that lifts when a user hovers, so the hidden data feels like a hidden layer you’re just unlocking. Keep transitions snappy, a single frame is usually enough; users notice when you linger too long. And if you’re hoarding those half‑finished ideas, trust them to run through a quick usability test first—sometimes the best “secret” is a feature that feels obvious in use. Keep it clean, keep it moving, and don’t let the design get stuck in a loop of “maybe I should add another button.”

Sounds solid—just keep an eye on contrast too, because a faint fade can get swallowed by a too‑busy background. If the A/B test shows a drop in click‑through, bump the opacity a touch or adjust the color a bit. Remember, the key is to make the hidden feel like a secret level, not a glitch. Good luck!

Good plan—just watch out for that “too‑soft” gray that turns the whole thing into a blur. A quick tweak in the HSL sliders can make the overlay pop without screaming. Let me know how the test goes!