System Requirements Document for windy-simple

1. Introduction

The project "windy-simple" aims to develop a simple single-page calculator. The primary audience is users who need a straightforward tool for performing basic arithmetic operations. The design is inspired by Susan Kare's iconic pixel-perfect design language, emphasizing clarity, friendliness, and a nostalgic touch.

2. System Overview

The system will deliver a single-page calculator that allows users to enter values, perform arithmetic operations, and view results. The calculator is accessible anonymously and is designed to be intuitive and easy to use. The design will feature a pixel-art style with a light color palette and a retro feel.

2a. Product Interpretation and Delivery Boundary

The calculator will be delivered as a single-page web application, accessible without any login or identity verification. The design constraints emphasize a simple, nostalgic interface with a focus on usability and clarity. The project will not include any additional features beyond the basic calculator functionality.

2b. Source Content Inventory

Not applicable as there is no explicit content_source directive.

2c. Page Content and Component Coverage

Calculator

• Display Screen

  • Shows the current input and results.
  • Styled as a large digital readout resembling an LED display.

• Numeric Keypad

  • Buttons for digits 0-9.
  • Pixel-perfect design with bold yellow for primary buttons.

• Operation Buttons

  • Basic arithmetic operations: addition, subtraction, multiplication, division.
  • Coral accent for secondary elements.

• Function Buttons

  • Clear button to reset the current input.
  • Equals button to calculate and display the result.

• Layout and Design

  • Tidy grid layout with playful system-UI cues.
  • Chunky borders for a retro feel.
  • Responsive hover states with frame-by-frame micro animations.

3. Functional Requirements

• As a Calculator User, I should be able to enter numeric values and arithmetic operations to perform calculations. (Provenance: explicit)
• As a Calculator User, I should see the calculated result displayed on the screen. (Provenance: explicit)
• As a Calculator User, I should be able to clear or revise my input for another calculation. (Provenance: required_inference)
• As a Calculator User, I should be able to access the calculator anonymously. (Provenance: required_inference)

4. User Personas

Calculator User

• Context: Uses the calculator for quick arithmetic tasks.
• Primary Goal: Perform basic calculations easily and efficiently.
• Responsibilities: Enter values and operations, review results, clear or revise calculations.
• Interactions: Engages with the calculator interface to input data and view results.
• Success: Successfully completes arithmetic tasks with minimal effort.

5. Core User Flows

1. Performing a Calculation

   • Start: User opens the calculator page.
   • Action: User enters numeric values and selects arithmetic operations.
   • Result: The calculator displays the result on the screen.
   • Next Step: User can clear the input or revise it for another calculation.

2. Clearing Input

   • Start: User has entered values and operations.
   • Action: User presses the clear button.
   • Result: The input is reset, and the user can start a new calculation.

6. Visuals Colors and Theme

• Muse: Susan Kare
• Palette:
  • Background: #EFEFEF
  • Surface: #FFFFFF
  • Text: #000000
  • Primary: #FFCC00
  • Accent: #FF6F61
  • Muted: #CCCCCC
• Typography:
  • Headings: Press Start 2P
  • Body: VT323
  • Scale: 1.5 modular (24/18/14)
• Shape Language: Iconic tiles and chunky-outline cards
• Layout: Tidy grids with playful system-UI cues
• Motion: Frame-by-frame micro animations, blink and slide

7. Signature Design Concept

The public entry page will feature a grid of pixel-art calculator buttons with a large digital display at the top. The design will use a light grey background with bold yellow and coral buttons, creating a retro and approachable feel.

8. Interaction Model & Motion Direction

• Interaction Model: Static
• Motion Tempo: Restrained
• Hero Dimensionality: Flat
• Landing Hero Motion Brief: The calculator interface will feature responsive hover states that animate with a crisp frame-by-frame effect, enhancing user interaction without overwhelming the simplicity of the design.

9. Non-Functional Requirements

• The calculator must load quickly and perform calculations efficiently.
• The interface should be responsive and accessible on various devices.

10. Tech Stack

• Frontend: React
• Styling: CSS with pixel-art design elements
• Deployment: Static site hosting (e.g., Netlify or Vercel)

11. Assumptions and Constraints

• The calculator will remain a single-page application.
• No user authentication or account management is required.
• The design will adhere strictly to the provided visual and thematic guidelines.

12. Glossary

• Pixel-Art: A form of digital art where images are created using small, distinct pixels.
• LED Display: A type of display that uses light-emitting diodes for visual output.
• Arithmetic Operations: Basic mathematical operations including addition, subtraction, multiplication, and division.