Yeh Calculator Module ek alag page (`calculator.html`) mein hai, jismein BOQ, R.A. Bill, BBS, Quantity, aur Unit Converter shamil hain.
Yahi aapka Look & Layout Controller Panel hai. Har button ek naya layout aur naya color theme apply karega.
Apna khud ka color define karein. **Custom Color - (User Settings)** theme select karna zaroori hai.
Yahan se aap sections ko hide/show kar sakte hain.
Important: Yeh shared link sirf uss ek section ko dikhayega aur baaki sab lock kar dega.