# Sample Input: Login Feature PRD

## Business Background

The current system lacks user authentication functionality, preventing users from saving personal data and configurations.

## Project Goals

Implement user login functionality supporting both email and phone number login methods.

## Functional Requirements

1. Users can log in using email + password
2. Users can log in using phone number + verification code
3. Redirect to homepage after successful login
4. Remember login state for 7 days

## Non-Functional Requirements

1. Passwords must be encrypted during transmission
2. Verification code valid for 5 minutes
3. Login failures must be logged