## ADDED Requirements

### Requirement: Responsive Layout
The system SHALL provide a responsive user interface that adapts to different screen sizes for optimal usability.

#### Scenario: Mobile sidebar behavior
- **WHEN** user accesses application on mobile device (width < 768px)
- **THEN** sidebar is hidden by default
- **THEN** hamburger menu button is visible in header
- **WHEN** user taps hamburger menu
- **THEN** sidebar slides in from left with backdrop overlay

#### Scenario: Table responsive behavior
- **WHEN** user views task list on small screen
- **THEN** table displays with horizontal scroll or switches to card layout
- **THEN** all essential information remains accessible

#### Scenario: Touch-friendly interactions
- **WHEN** user interacts with application on touch device
- **THEN** all interactive elements have minimum 44x44 pixel tap targets
- **THEN** sufficient spacing prevents accidental taps

### Requirement: Complete Internationalization
The system SHALL support complete internationalization with no hardcoded text strings.

#### Scenario: Language switching
- **WHEN** user changes language preference
- **THEN** all UI text updates to selected language
- **THEN** no untranslated strings remain visible

#### Scenario: Date and time localization
- **WHEN** dates and times are displayed
- **THEN** format follows user's locale preference
- **THEN** relative times (e.g., "2 hours ago") are properly translated

#### Scenario: New component text
- **WHEN** new UI components are added
- **THEN** all text strings use i18n translation keys
- **THEN** translations exist for all supported locales