System Requirements Document for windy-single

1. Introduction

The project "windy-single" is a simple, single-page calculator designed for personal use. The intent is to provide a straightforward tool that supports basic arithmetic operations with a focus on simplicity and ease of use.

2. System Overview

The "windy-single" calculator is a single-page application intended for personal use. It supports basic arithmetic calculations, displays results, and allows users to clear or reset calculations. The design is inspired by Naoto Fukasawa's "super normal" philosophy, emphasizing simplicity and calmness.

2a. Product Interpretation and Delivery Boundary

The calculator is delivered as a single-page application with no user authentication or complex interactions. It is designed for personal use, adhering to a simple and intuitive interface. The application does not support multi-user access or advanced features beyond basic arithmetic operations.

2b. Source Content Inventory

Not applicable as there is no explicit content_source directive.

2c. Page Content and Component Coverage

Calculator

• Display: Shows the current input and calculation result.
• Number Input: Buttons for digits 0-9.
• Operator Input: Buttons for basic arithmetic operations (+, -, *, /).
• Clear/Reset: A button to clear the current input and reset the calculator.
• Calculation Execution: Button to execute the calculation and display the result.
• Error Handling: Display error messages for invalid operations (e.g., division by zero).

3. Functional Requirements

• As a Calculator User, I should be able to input numbers and basic arithmetic operators to perform calculations. (explicit)
• As a Calculator User, I should see the result of my calculation displayed on the screen. (explicit)
• As a Calculator User, I should be able to clear or reset the current calculation to start a new one. (explicit)

4. User Personas

Calculator User

• Context: Uses the calculator for personal arithmetic calculations.
• Primary Goal: Perform simple calculations quickly and easily.
• Responsibilities: Enter numbers and operations, view results, and reset calculations as needed.
• Interactions: Engages with the calculator interface to perform calculations.
• Success: Completing calculations accurately and efficiently on a single-page interface.

5. Core User Flows

1. Performing a Calculation

   • Start: User opens the calculator page.
   • Action: User inputs numbers and selects arithmetic operations.
   • Result: The calculator displays the result of the calculation.
   • Continuation: User can clear the calculation and start a new one.

2. Clearing a Calculation

   • Start: User has completed a calculation.
   • Action: User presses the clear/reset button.
   • Result: The calculator resets, clearing the display and inputs.
   • Continuation: User can begin a new calculation.

6. Visuals Colors and Theme

• Muse: Naoto Fukasawa
• Palette:
  • Background: #F8F8F8
  • Surface: #FFFFFF
  • Text: #333333
  • Primary: #D3D3D3
  • Accent: #A9A9A9
  • Muted: #E0E0E0
• Typography:
  • Headings: Karla, Medium weight
  • Body: Work Sans
  • Scale: 1.25 modular (24/20/16)
• Shape Language: Simple rounded blocks
• Layout: Single-column with ample spacing

7. Signature Design Concept

The calculator interface is centered on the page, featuring a soft grey background with rounded buttons and clear labels. The display is large and easy to read, ensuring a calm and unobtrusive user experience.

8. Interaction Model & Motion Direction

• Interaction Model: Static
• Motion Tempo: Still
• Hero Dimensionality: Flat
• Landing Hero Motion Brief: The calculator interface is the focal subject, with subtle tactile feedback on button presses. The first frame presents the calculator centered on a light background, with a reduced-motion state maintaining clarity and simplicity.

9. Non-Functional Requirements

• Simplicity: The calculator must remain simple and intuitive, adhering to the "super normal" design philosophy.
• Performance: The application should load quickly and respond promptly to user inputs.

10. Tech Stack

• Frontend: React
• Styling: CSS for layout and design
• Build Tool: Webpack or similar for bundling

11. Assumptions and Constraints

• The calculator is intended for personal use only.
• The design must remain simple and limited to a single page.
• No user authentication or complex interactions are required.

12. Glossary

• Calculator User: The individual using the calculator for personal arithmetic calculations.
• Arithmetic Operations: Basic mathematical operations including addition, subtraction, multiplication, and division.