System Requirements Document for crystal-simple

1. Introduction

The project "crystal-simple" is a personal-use, single-page todo application designed to facilitate personal productivity and organization. The application is intended for individuals seeking a simple and minimalistic tool to manage their tasks effectively. The design philosophy is inspired by Kenya Hara's principles of calm minimalism, focusing on clarity and tranquility.

2. System Overview

The "crystal-simple" application is a single-page todo app that allows users to create, view, update, complete, and remove todo items. The application is designed for personal use, with a focus on simplicity and ease of use. It supports the user's personal todo workflow, with todo items persisting on the local device to ensure continuity across sessions. The application is accessible anonymously, allowing users to engage with the todo workflow without requiring an account or login.

2a. Product Interpretation and Delivery Boundary

The application is delivered as a single-page web application, accessible anonymously to support personal use. The todo items are stored locally on the user's device, ensuring privacy and persistence without the need for server-side storage or user accounts. The design adheres to a calm and minimalist aesthetic, promoting focus and organization.

2b. Source Content Inventory

Not applicable as there is no explicit content_source directive.

2c. Page Content and Component Coverage

Todo

• Information/State:

  • List of todo items with their current status (active or completed).
  • Input field for adding new todo items.
  • Local storage for persisting todo items across sessions.

• Primary Actions:

  • Add a new todo item.
  • Mark a todo item as completed.
  • Edit an existing todo item.
  • Delete a todo item.

• Supporting Actions:

  • View all todo items.
  • Filter todo items by status (active/completed).

• Domain Entities:

  • Todo Item: Represents a task with a title and status.

• Component Responsibilities:

  • Input Field: Allows users to enter new todo items.
  • Todo List: Displays all todo items with options to edit, complete, or delete.
  • Local Storage: Persists todo items on the user's device.

• States:

  • Loading: Initial load of the application.
  • Empty: No todo items present.
  • Success: Todo item added, updated, or deleted successfully.
  • Error: Handling of any errors during operations.

3. Functional Requirements

• As a Personal Todo User, I should be able to add new todo items to my list so that I can keep track of tasks I need to complete. (Provenance: explicit)
• As a Personal Todo User, I should be able to mark todo items as completed to indicate that a task is finished. (Provenance: explicit)
• As a Personal Todo User, I should be able to edit existing todo items to update task details. (Provenance: explicit)
• As a Personal Todo User, I should be able to delete todo items that are no longer needed. (Provenance: explicit)
• As a Personal Todo User, I should be able to view all my todo items to manage my tasks effectively. (Provenance: explicit)
• As a Personal Todo User, I should be able to filter todo items by their status to focus on specific tasks. (Provenance: explicit)
• Todo items should persist on the local device across sessions so that I can revisit and manage them without losing data. (Provenance: required_inference)

4. User Personas

Personal Todo User

• Product Context: Uses the "crystal-simple" application to manage personal tasks and improve productivity.
• Primary Goal: To efficiently manage and organize personal tasks using a simple and intuitive interface.
• Distinct Responsibilities:
  • Capturing and reviewing todo items.
  • Updating task states and managing task completion.
  • Removing tasks that are no longer relevant.
• Relevant Inputs/Decisions:
  • Deciding which tasks to add, complete, or remove.
  • Prioritizing tasks based on personal criteria.
• Interactions with Other Participants: None, as the application is for personal use only.
• Observable Success: Successfully manages tasks with minimal effort, maintaining a clear and organized todo list.

5. Core User Flows

1. Adding a Todo Item:

   • Starting Context: User opens the "crystal-simple" application.
   • Action: User enters a new task in the input field and submits it.
   • Result: The new task appears in the todo list.
   • Next Step: User can continue adding tasks or manage existing ones.

2. Completing a Todo Item:

   • Starting Context: User views the todo list with active tasks.
   • Action: User marks a task as completed.
   • Result: The task's status changes to completed.
   • Next Step: User can view completed tasks or manage other tasks.

3. Editing a Todo Item:

   • Starting Context: User identifies a task that needs updating.
   • Action: User edits the task details and saves changes.
   • Result: The task is updated in the todo list.
   • Next Step: User can continue managing tasks.

4. Deleting a Todo Item:

   • Starting Context: User decides a task is no longer needed.
   • Action: User deletes the task from the list.
   • Result: The task is removed from the todo list.
   • Next Step: User can continue managing remaining tasks.

5. Viewing and Filtering Todo Items:

   • Starting Context: User wants to review tasks.
   • Action: User views all tasks or applies a filter to see specific tasks.
   • Result: The todo list displays tasks according to the selected filter.
   • Next Step: User can manage tasks based on the filtered view.

6. Visuals Colors and Theme

• Muse: Kenya Hara
• Palette:
  • Background: #FFFFFF
  • Surface: #F5F5F5
  • Text: #333333
  • Primary: #00796B
  • Accent: #D32F2F
  • Muted: #BDBDBD
• Typography:
  • Headings: Karla — Light weight, wide tracking, sentence case
  • Body: Source Sans Pro
  • Scale: 1.333 modular, 48/36/24/16
• Shape Language: Soft, rounded corners with generous margins.
• Layout: Centered single-column layout with ample whitespace.
• Imagery: Minimalist icons and soft illustrations.

7. Signature Design Concept

The public entry of the "crystal-simple" application features a centered title with a calm, pastel accent color in the background. The design includes softly rounded input fields and buttons, with generous margins around todo items to maintain focus. Subtle color accents indicate task priorities or completion, and a minimalist iconography set is used for task actions.

8. Interaction Model & Motion Direction

• Interaction Model: Static
• Motion Tempo: Still
• Hero Dimensionality: Flat
• Landing Hero Motion Brief: The landing page features a centered title with a calm, pastel accent color. The design uses subtle fades and slow reveals to maintain a calm user experience. In reduced-motion mode, all animations are replaced with instant transitions.

9. Non-Functional Requirements

• The application must operate efficiently on modern web browsers without requiring server-side interactions.
• The design must adhere to the principles of calm minimalism, ensuring a focus on user productivity and task management.

10. Tech Stack

• Frontend: React
• Storage: Local Storage for persisting todo items
• Styling: CSS with a focus on minimalism and accessibility

11. Assumptions and Constraints

• The application is intended for personal use only and does not support multi-user functionality.
• The design is constrained to a single-page application to maintain simplicity and focus.

12. Glossary

• Todo Item: A task or activity that the user needs to manage.
• Local Storage: A web storage mechanism that allows data to be stored locally on the user's device.