System Requirements Document (SRD)

Project Name: Cosmic-Phone

1. Introduction

The Cosmic-Phone project aims to create a feature-rich, user-friendly website for selling phones. The platform will cater to customers in India (IN), providing a seamless experience for browsing, comparing, reviewing, and trading in phones. The website will include advanced features such as product listings, reviews, comparisons, trade-ins, and account management, ensuring a comprehensive solution for phone buyers and sellers.

This document outlines the system requirements for the Cosmic-Phone project, detailing functional and non-functional requirements, user personas, design concepts, and technical specifications.

2. System Overview

The Cosmic-Phone platform will serve as an online marketplace for phones, enabling users to:

• Browse and search for phones based on specifications, brands, and price ranges.
• Compare phones side-by-side to make informed decisions.
• Read and write reviews for products.
• Trade in old phones for discounts on new purchases.
• Create accounts to manage purchases, trade-ins, and reviews, while also supporting guest checkout for convenience.

The system will be optimized for Indian users, incorporating local currency (INR), timezone (IST), and language preferences. It will leverage modern web and mobile technologies to ensure accessibility across devices.

3. Functional Requirements

User Stories:

• As a User, I should be able to browse phone listings by categories, brands, and specifications.
• As a User, I should be able to compare multiple phones side-by-side.
• As a User, I should be able to read and write reviews for phones.
• As a User, I should be able to trade in my old phone for a discount on a new purchase.
• As a User, I should be able to create an account to manage my purchases, trade-ins, and reviews.
• As a Guest, I should be able to make purchases without creating an account.
• As an Admin, I should be able to manage product listings, reviews, and trade-in offers.

4. User Personas

1. User

• Description: Regular customers looking to purchase phones, compare options, and trade in old devices.
• Goals: Easy navigation, detailed product information, and seamless checkout.

2. Guest

• Description: Visitors who prefer not to create accounts but still want to browse and purchase phones.
• Goals: Quick and hassle-free checkout.

3. Admin

• Description: Platform managers responsible for maintaining product listings, moderating reviews, and managing trade-in offers.
• Goals: Efficient tools for managing content and user interactions.

5. Visuals Colors and Theme

Color Palette:

• Background: #F5F9FF (Soft Sky Blue)
• Surface: #FFFFFF (Pure White)
• Text: #1A1A1A (Deep Charcoal)
• Accent: #FF6F61 (Vibrant Coral)
• Muted Tones: #B0BEC5 (Calm Steel Gray)

Theme:

The Cosmic-Phone website will feature a clean and modern design with a focus on usability. The color palette reflects a professional yet approachable aesthetic, combining soft blues and vibrant coral accents to create a visually engaging experience.

6. Signature Design Concept

Interactive Galaxy of Phones

The homepage will feature an interactive galaxy map where each "star" represents a phone model. Users can navigate the galaxy by dragging, zooming, or clicking on stars to explore product details.

• Animations: Stars will twinkle subtly, and constellations will form dynamically based on phone categories (e.g., budget phones, flagship models).
• Transitions: Smooth zoom-in and zoom-out effects as users explore the galaxy.
• Micro-Interactions: Hovering over a star will display a brief summary of the phone (e.g., name, price, key specs). Clicking on a star will open a detailed product page.
• Color Shifts: The galaxy background will transition between shades of blue and coral based on the time of day, creating a dynamic and immersive experience.

This bold design concept will make the Cosmic-Phone website unforgettable and engaging for users.

7. Non-Functional Requirements

• Performance: The website must load within 2 seconds for all pages.
• Scalability: The system should support up to 1 million users concurrently.
• Security: Implement robust security measures, including SSL encryption, secure authentication, and regular vulnerability assessments.
• Accessibility: Ensure compliance with WCAG 2.1 standards for accessibility.
• Localization: Support INR currency, IST timezone, and multilingual options (e.g., English, Hindi).

8. Tech Stack

Frontend:

• React for Web
• React Native for Mobile App

Backend:

• Python
• FastAPI

Database:

• MySQL or MariaDB (preferred for RDBMS)
• MongoDB for NoSQL
• WeaviateDB for VectorDB

AI Models:

• GPT 5.4 for user-friendly responses
• Claude 4.6 Opas for academic or coding work
• Gemini 3.1 Pro for friendly responses
• Google Nano Banana for image generation

AI Tools:

• Litellm for LLM Routing
• Langchain

Orchestration:

• Docker and docker-compose for local orchestration
• Kubernetes for server-side orchestration

9. Assumptions and Constraints

Assumptions:

• Users will primarily access the platform via web browsers and mobile devices.
• Trade-in offers will be calculated based on predefined criteria (e.g., phone condition, model).
• Admins will have access to a secure backend for managing content and user interactions.

Constraints:

• The platform must comply with Indian e-commerce regulations.
• Payment gateways must support INR transactions.
• The system must be optimized for low-bandwidth connections common in rural areas.

10. Glossary

• WCAG: Web Content Accessibility Guidelines.
• SSL: Secure Sockets Layer, a standard security protocol for encrypted communication.
• IST: Indian Standard Time.
• RDBMS: Relational Database Management System.
• NoSQL: Non-relational database system.
• VectorDB: Database optimized for vector-based data storage and retrieval.