System Requirements Document (SRD)

Project Name: tough-calculator

1. Introduction

The tough-calculator project is designed to create a modern, realistic, and user-friendly calculator application. The goal is to provide a clean and minimalistic interface with advanced features and smooth interactions, ensuring usability across various devices. This document outlines the system requirements for the project, tailored to meet the needs of Ritanshu Sharma, based in India (IN). Locale-specific considerations, such as time zones (IST) and currency formats (₹), will be incorporated where relevant.

2. System Overview

The tough-calculator will be a responsive web and mobile application designed to emulate the functionality and aesthetics of a real-world calculator. The system will feature:

• A display screen for showing user inputs and results in real-time.
• A grid layout of buttons for numbers, operators, and advanced functions.
• A modern design with rounded buttons, soft shadows, and hover/click animations.
• Support for both light and dark modes for better usability in different lighting conditions.
• Advanced features such as backspace, percentage calculations, and memory functions.

The application will be built using modern web technologies, ensuring smooth performance and compatibility across devices.

3. Functional Requirements

• As a User, I should be able to input numbers (0–9) and basic operators (+, −, ×, ÷).
• As a User, I should be able to calculate results using the equals (=) button.
• As a User, I should be able to clear all inputs using the clear (C) button.
• As a User, I should be able to use a decimal point (.) for fractional calculations.
• As a User, I should be able to delete the last input using a backspace button.
• As a User, I should be able to calculate percentages using a percentage (%) button.
• As a User, I should be able to use memory functions (M+, M-, MR, MC) for storing and recalling values.
• As a User, I should see real-time updates on the display as I input values.
• As a User, I should experience hover and click animations for buttons.
• As a User, I should be able to toggle between light and dark modes.

4. User Personas

4.1 General User

• Description: A typical user who needs a calculator for basic and advanced arithmetic operations.
• Goals: Perform quick calculations, toggle between modes, and enjoy a smooth, intuitive experience.
• Technical Proficiency: Basic to intermediate.

4.2 Advanced User

• Description: A user who requires additional features like memory functions and percentage calculations.
• Goals: Efficiently handle complex calculations with advanced features.
• Technical Proficiency: Intermediate to advanced.

5. Visuals Colors and Theme

Color Palette

6. Signature Design Concept

The tough-calculator will feature a "Dynamic Glass Panel" design for its homepage and interface.

Key Features:

• Glassmorphism Aesthetic: The calculator interface will have a frosted glass effect, with semi-transparent panels that subtly blur the background.
• Interactive Animations: Buttons will "press down" with a soft shadow effect when clicked, and hover states will include a glowing outline.
• Real-Time Theme Transition: Users can toggle between light and dark modes, with smooth transitions that adjust the entire UI color scheme dynamically.
• Responsive Layout: The calculator will resize and reflow seamlessly across devices, with a mobile-first design approach.
• Micro-Interactions: Subtle animations, such as a ripple effect on button clicks and a sliding transition for the display updates, will enhance the user experience.

The homepage will feature a 3D rotating calculator model that users can interact with. Hovering over the model will rotate it, and clicking on it will launch the calculator interface. This bold, interactive element will make the application instantly memorable.

7. Non-Functional Requirements

• The application must load within 2 seconds on a standard 4G connection.
• The UI must be fully responsive and accessible on devices with screen sizes ranging from 4 inches to 27 inches.
• The system must support both light and dark modes, with a toggle option available to the user.
• The application must handle up to 10,000 concurrent users without performance degradation.
• All animations and transitions must complete within 300ms for a smooth user experience.

8. Tech Stack

Frontend

• React for Web
• React Native for Mobile

Backend

• Python
• FastAPI

Database

• MySQL (with Alembic for migrations)

AI Tools (Optional for future enhancements)

• GPT 5.4 for user-friendly responses

Local Orchestration

• Docker
• docker-compose

Server-Side Orchestration

• Kubernetes

9. Assumptions and Constraints

• The application will primarily target users in India, with IST as the default timezone and ₹ as the default currency symbol where applicable.
• The system will not include scientific calculator functions in the initial release.
• The application will be hosted on a cloud platform with scalable infrastructure.
• Advanced AI features, if implemented, will require additional resources and integration efforts.

10. Glossary

• UI: User Interface
• UX: User Experience
• IST: Indian Standard Time
• RDBMS: Relational Database Management System
• M+, M-, MR, MC: Memory functions for calculators (Add, Subtract, Recall, Clear Memory)
• Glassmorphism: A design trend characterized by frosted glass-like elements.