System Requirements Document for silver-simple

1. Introduction

The project "silver-simple" aims to create a simple, single-page calculator for personal use. The design philosophy is inspired by Naoto Fukasawa's approach to 'super normal' design, emphasizing calm simplicity, functionality, and ease of use.

2. System Overview

This document outlines the requirements for a single-page calculator application intended for personal use. The calculator will provide basic arithmetic operations within a minimalist interface, ensuring ease of use and clarity. The system is designed to be accessed without any identity or session management, reflecting its personal use case.

2a. Product Interpretation and Delivery Boundary

The calculator is delivered as a single-page web application, accessible without login or identity verification, aligning with its personal use intent. The design is constrained to a single page, ensuring all interactions occur within this boundary. Future expansions or additional features are not considered within the current scope.

2b. Source Content Inventory

Not applicable as no content source directive was provided.

2c. Page Content and Component Coverage

Calculator

• Display Area

  • Shows current input and results.
  • Supports clear visibility with a large, centered number display.

• Numeric Keypad

  • Buttons for digits 0-9.
  • Clear, rounded buttons with tactile feedback.

• Operations

  • Basic arithmetic operations: addition, subtraction, multiplication, division.
  • Each operation has a dedicated button.

• Equals Button

  • Executes the calculation.
  • Uses the accent color for emphasis.

• Clear Button

  • Resets the current input and result.

• Error Handling

  • Displays error messages for invalid operations (e.g., division by zero).

• Layout and Design

  • Centered button grid with ample spacing for touch interaction.
  • Simple rounded blocks with obvious affordances.

3. Functional Requirements

• As a Personal Calculator User, I should be able to input numbers and perform basic arithmetic operations to obtain results.

  • Provenance: explicit
  • Lifecycle Facts: Input numbers, select operation, view result.
  • Observable Acceptance: Correct calculation result displayed.

• As a Personal Calculator User, I should be able to clear the current input and start a new calculation.

  • Provenance: explicit
  • Lifecycle Facts: Press clear, reset display.
  • Observable Acceptance: Display reset to initial state.

4. User Personas

Personal Calculator User

• Product Context: Uses the calculator for personal arithmetic calculations.
• Primary Goal: Perform quick and accurate calculations.
• Distinct Responsibilities: Enter numbers, select operations, view results.
• Interactions: Direct interaction with the calculator interface.
• Observable Success: Accurate results displayed promptly after input.

5. Core User Flows

5.1 Performing a Calculation

1. Start: Open the Calculator page.
2. Input Numbers: User enters numbers using the numeric keypad.
3. Select Operation: User selects an arithmetic operation (e.g., addition).
4. View Result: User presses the equals button to view the result.
5. Continuation: User can start a new calculation or clear the current input.

5.2 Clearing the Calculator

1. Start: Open the Calculator page with existing input.
2. Clear Input: User presses the clear button.
3. Result: Display resets to initial state, ready for new input.

6. Visuals Colors and Theme

• Muse: Naoto Fukasawa
• Palette:
  • Background: #F5F5F5
  • Surface: #FFFFFF
  • Text: #333333
  • Primary: #CCCCCC
  • Accent: #A1C4FD
  • Muted: #E0E0E0
• Typography:
  • Headings: Karla, Medium weight
  • Body: Karla
  • Scale: 1.25 modular
• Shape Language: Simple rounded blocks
• Layout: Centered button grid
• Motion: Subtle, tactile feedback
• Motion Tempo: still
• Hero Dimensionality: flat

7. Signature Design Concept

The entry page features a minimalist calculator interface with a large, centered number display. The buttons are soft grey with rounded edges, and the equals button uses a gentle blue accent to guide user focus. The design emphasizes functionality and ease of use, with generous spacing between keys for touch accuracy.

8. Interaction Model & Motion Direction

• Interaction Model: Static
• Motion Tempo: still
• Hero Dimensionality: flat
• Landing Hero Motion Brief: A centered composition with a clean, minimalist calculator interface. The interface provides subtle tactile feedback on button press, maintaining focus on the task.

9. Non-Functional Requirements

• Performance: The calculator should respond instantly to user inputs.
• Usability: The interface must be intuitive and easy to use without instructions.
• Accessibility: Ensure high contrast and readability for all text and buttons.

10. Tech Stack

• Frontend: React
• Styling: CSS with a focus on responsive design
• Deployment: Static site hosting

11. Assumptions and Constraints

• Assumptions:
  • The calculator is used for basic arithmetic operations only.
  • The user interacts with the calculator on a personal device.
• Constraints:
  • The application is a single-page design.
  • No user authentication or session management is required.

12. Glossary

• Arithmetic Operations: Basic mathematical operations including addition, subtraction, multiplication, and division.
• Single-page Application: A web application that interacts with the user by dynamically rewriting the current page rather than loading entire new pages from the server.