System Requirements Document for verdant-single

1. Introduction

verdant-single is a simple calculator delivered as a single page. The user opens one page, enters numbers and operations, and reads the computed result on that same page.

The product intent is deliberately narrow and comes directly from the authoritative requirement thread: "create a simple single page design of the calculator." Two hard product facts follow from it and govern every section of this document:

1. The calculator is the sole product surface — one page, no additional pages or flows.
2. The design must be simple and minimal.

The