System Requirements Document for amber-simple

1. Introduction

The project "amber-simple" aims to deliver a simple, single-page calculator application. The primary audience for this product is individuals who require a straightforward tool for performing basic arithmetic calculations. The design emphasizes simplicity, precision, and user-friendly interaction, inspired by Jony Ive's design language.

2. System Overview

The "amber-simple" calculator is a web-based application designed to perform basic arithmetic operations. It is delivered as a single-page interface, accessible without authentication, and focuses on simplicity and ease of use. The calculator supports basic arithmetic calculations such as addition, subtraction, multiplication, and division. The interface is designed to be intuitive, with a focus on clear text and user-friendly interaction.

2a. Product Interpretation and Delivery Boundary

The calculator is delivered as a single-page web application, accessible directly without any authentication requirements. This ensures that users can immediately perform calculations without any barriers. The application is constrained to basic arithmetic functions and does not include any scientific calculation features. The current expression and result are transient and only available during the active calculation session.

2b. Source Content Inventory

Not applicable as there are no content sources specified beyond the authoritative user requirement thread.

2c. Page Content and Component Coverage

Calculator

• Numeric Entry: Users can input numbers using a virtual number pad.
• Basic Arithmetic Operations: Buttons for addition, subtraction, multiplication, and division.
• Calculation Result: Displays the result of the arithmetic operation.
• Reset Control: A button to clear the current expression and start a new calculation.
• Design Elements:
  • Background: #F5F5F5
  • Surface (buttons): #FFFFFF
  • Text (numbers and operations): #000000
  • Primary (borders): #C0C0C0
  • Accent (equals button): #FFA500
  • Muted (inactive states): #E0E0E0
• Typography:
  • Headings: Inter Tight — Light weight
  • Body: Work Sans
  • Scale: 1.414 modular, 48/34/24/16
• Shape Language: Rounded buttons with soft continuous-curve radii.
• Layout: Single-column focus with centered number pad and generous margins.
• Motion: Slow, physical easing with reveal-on-interaction for buttons.

3. Functional Requirements

• As a Calculator User, I should be able to perform basic arithmetic calculations (addition, subtraction, multiplication, division) on a single-page interface without authentication. (Provenance: explicit)
• As a Calculator User, I should see the result of my calculation immediately after pressing the equals button. (Provenance: explicit)
• As a Calculator User, I should be able to clear the current calculation and start a new one using a reset button. (Provenance: explicit)

4. User Personas

Calculator User

• Product Context: Uses the simple calculator to perform basic arithmetic operations.
• Primary Goal: To quickly and easily perform calculations without any additional features or distractions.
• Distinct Responsibilities: Enter numbers, select arithmetic operations, view results, and reset calculations.
• Interactions: Direct interaction with the calculator interface to input numbers and operations.
• Observable Success: Successful calculation and display of results on the single-page interface.

5. Core User Flows

1. Performing a Calculation

   • Starting Context: User opens the calculator page.
   • Action: User inputs numbers and selects an arithmetic operation.
   • Result: The operation is displayed, and the user presses the equals button.
   • Outcome: The result of the calculation is displayed.
   • Next Step: User can either reset the calculation or perform another operation.

2. Resetting the Calculator

   • Starting Context: User has completed a calculation.
   • Action: User presses the reset button.
   • Result: The current calculation is cleared.
   • Outcome: User can start a new calculation.

6. Visuals Colors and Theme

• Muse: Jony Ive
• Palette:
  • Background: #F5F5F5
  • Surface: #FFFFFF
  • Text: #000000
  • Primary: #C0C0C0
  • Accent: #FFA500
  • Muted: #E0E0E0
• Typography:
  • Headings: Inter Tight — Light weight
  • Body: Work Sans
  • Scale: 1.414 modular, 48/34/24/16
• Shape Language: Rounded buttons with soft continuous-curve radii.
• Layout: Single-column focus with centered number pad and generous margins.

7. Signature Design Concept

The calculator's design features a centered number pad with generous white space, accented by an orange equals button. The interface uses a light grey and orange palette, with rounded button shapes and subtle drop shadows. Large, easy-to-read numbers and operators are emphasized, with tactile animations on button press to enhance user interaction.

8. Interaction Model & Motion Direction

• Interaction Model: Static
• Motion Tempo: Restrained
• Hero Dimensionality: Flat
• Landing Hero Motion Brief: The calculator interface features a centered number pad with large, easy-to-read numbers. The equals button is accented in orange, providing a focal point. Button presses are accompanied by subtle tactile animations, enhancing the user experience.

9. Non-Functional Requirements

• Performance: The calculator should load quickly and respond instantly to user inputs.
• Accessibility: The interface should be accessible to users with disabilities, following standard web accessibility guidelines.
• Usability: The design should be intuitive and easy to use, with clear labels and a straightforward layout.

10. Tech Stack

• Frontend: React
• Styling: CSS with a focus on responsive design
• Deployment: Docker for containerization

11. Assumptions and Constraints

• The calculator will only support basic arithmetic operations.
• The application will be delivered as a single-page web application.
• No authentication is required to access the calculator.

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.