# frontend-ui Specification

## Purpose
TBD - created by archiving change refactor-frontend-ux-i18n. Update Purpose after archive.
## Requirements
### Requirement: Minimal Login Page Design

The login page SHALL use a professional minimal design style that is consistent with the rest of the application.

The login page SHALL NOT include:
- Animated gradient backgrounds
- Floating decorative elements (orbs, particles)
- Pulsing or floating animations
- Marketing claims or statistics
- Feature promotion sections

The login page SHALL include:
- Centered login form with clean white card
- Application logo and name
- Username and password input fields
- Login button with loading state
- Error message display area
- Simple solid color background

#### Scenario: Login page renders with minimal design
- **WHEN** user navigates to the login page
- **THEN** the page displays a centered login form
- **AND** no animated decorative elements are visible
- **AND** no marketing content is displayed

#### Scenario: Login form visual consistency
- **WHEN** comparing login page to internal pages
- **THEN** the visual style (colors, typography, spacing) is consistent

---

### Requirement: Multi-language Support

The application SHALL support multiple languages with user-selectable language preference.

Supported languages:
- Traditional Chinese (zh-TW) - Default
- English (en-US)

The language selection SHALL be persisted in localStorage and restored on page reload.

#### Scenario: Language switcher available
- **WHEN** user is logged in and viewing any page
- **THEN** a language switcher component is visible in the top navigation bar

#### Scenario: Switch to English
- **WHEN** user selects English from the language switcher
- **THEN** all UI text immediately changes to English
- **AND** the preference is saved to localStorage

#### Scenario: Switch to Traditional Chinese
- **WHEN** user selects Traditional Chinese from the language switcher
- **THEN** all UI text immediately changes to Traditional Chinese
- **AND** the preference is saved to localStorage

#### Scenario: Language preference persistence
- **WHEN** user has previously selected a language preference
- **AND** user reloads the page or returns later
- **THEN** the application displays in the previously selected language

---

### Requirement: Accurate Product Description

All user-facing text SHALL accurately describe the product capabilities without exaggeration.

The application SHALL NOT display:
- Unverified accuracy percentages (e.g., "99% accuracy")
- Superlative marketing claims (e.g., "lightning fast", "enterprise-grade")
- Unsubstantiated statistics
- Comparative claims without evidence

The application MAY display:
- Factual feature descriptions
- Supported file formats
- Authentication method information

#### Scenario: Login page displays factual information
- **WHEN** user views the login page
- **THEN** only factual product information is displayed
- **AND** no unverified claims are present

#### Scenario: Feature descriptions are accurate
- **WHEN** any page describes product features
- **THEN** the descriptions are factual and verifiable