## ADDED Requirements

### Requirement: Responsive Layout Breakpoints

The application SHALL implement responsive design with three distinct layout breakpoints: desktop (>1024px width), tablet (768-1024px width), and mobile (<768px width), adapting the UI layout and component arrangement based on available screen width.

#### Scenario: Desktop layout at full width

- **WHEN** the application window width is greater than 1024px
- **THEN** the UI displays in desktop mode with horizontal layouts, side-by-side elements, and full-width forms

#### Scenario: Tablet layout at medium width

- **WHEN** the application window width is between 768px and 1024px
- **THEN** the UI adapts to tablet mode with optimized spacing, some elements stacked vertically, and touch-friendly sizing

#### Scenario: Mobile layout at narrow width

- **WHEN** the application window width is less than 768px
- **THEN** the UI displays in mobile mode with single-column vertical layouts, collapsed sections, and mobile-optimized controls

### Requirement: Adaptive Query Form

The DNS query form SHALL adapt its layout from horizontal multi-column on desktop to single-column vertical stack on mobile, ensuring all form controls remain accessible and usable.

#### Scenario: Query form on desktop

- **WHEN** displayed at desktop width (>1024px)
- **THEN** form fields are arranged in optimal multi-row layout with labels beside controls

#### Scenario: Query form on mobile

- **WHEN** displayed at mobile width (<768px)
- **THEN** form fields stack vertically in single column with full-width inputs and touch-friendly spacing (minimum 12px between elements)

### Requirement: Responsive Results Display

The DNS results view SHALL adapt from horizontal button layouts to vertical stacks on narrow screens while maintaining readability and easy access to export, copy, and clear functions.

#### Scenario: Results with action buttons on desktop

- **WHEN** query results are displayed at desktop width
- **THEN** summary label and action buttons (export, copy command, raw output, clear) are arranged horizontally in a single row

#### Scenario: Results with stacked actions on mobile

- **WHEN** query results are displayed at mobile width (<768px)
- **THEN** summary label appears above action buttons, buttons are full-width or stacked vertically with adequate touch targets (minimum 44px height)

### Requirement: Touch-Friendly Interactive Elements

All interactive elements (buttons, switches, dropdowns, list items) SHALL provide touch-friendly hit targets with minimum dimensions of 44x44 pixels on mobile and tablet breakpoints.

#### Scenario: Button sizing on mobile

- **WHEN** interactive buttons are rendered on mobile/tablet (<1024px width)
- **THEN** buttons have minimum height of 44px and adequate horizontal padding for comfortable touch interaction

#### Scenario: List item touch targets

- **WHEN** list items (history, batch domains, favorites) are displayed on mobile
- **THEN** each list row has minimum 44px height with touch-friendly spacing between items

### Requirement: Adaptive Dialog Layouts

All dialogs (Batch Lookup, Server Comparison, Preferences) SHALL adapt their content width and internal layouts based on available screen size, using full-screen or near-full-screen presentation on mobile.

#### Scenario: Batch dialog on desktop

- **WHEN** Batch Lookup Dialog opens on desktop (>1024px)
- **THEN** dialog displays at 800x600 size with horizontal controls and multi-column layout

#### Scenario: Batch dialog on mobile

- **WHEN** Batch Lookup Dialog opens on mobile (<768px)
- **THEN** dialog occupies full screen or nearly full screen, controls stack vertically, and buttons are full-width

#### Scenario: Preferences on mobile

- **WHEN** Preferences dialog opens on mobile
- **THEN** preference rows adapt to narrow width with full-width controls and adequate spacing

### Requirement: Adaptive Header Bar

The application header bar SHALL adapt its content layout for mobile screens by potentially hiding or collapsing secondary controls, ensuring primary actions remain visible and accessible.

#### Scenario: Header bar on desktop

- **WHEN** displayed at desktop width
- **THEN** header bar shows all controls (history button, menu button) with standard spacing

#### Scenario: Header bar on mobile

- **WHEN** displayed at mobile width (<768px)
- **THEN** header bar maintains essential controls with appropriate sizing, potentially using icons-only display for space conservation

### Requirement: Responsive History Popover

The query history popover SHALL adapt its dimensions and internal layout based on available screen width, ensuring usability on mobile devices.

#### Scenario: History popover on desktop

- **WHEN** history button clicked on desktop (>1024px)
- **THEN** popover displays at 400x500 size below the history button

#### Scenario: History popover on mobile

- **WHEN** history button clicked on mobile (<768px)
- **THEN** popover adapts to available width (max 90% screen width) with appropriate height and scrolling

### Requirement: Minimum Supported Resolution

The application SHALL remain functional and usable at minimum resolution of 360x640 pixels (common mobile device size), with no critical functionality hidden or inaccessible.

#### Scenario: Application at minimum mobile resolution

- **WHEN** application runs at 360x640 pixel window size
- **THEN** all essential features (domain input, query button, record type selection, results) remain accessible and operable

#### Scenario: Content scrollability at minimum size

- **WHEN** content exceeds viewport at 360x640 resolution
- **THEN** appropriate scrolling is available for all overflowing content areas (forms, results, history)

### Requirement: Responsive Testing and Validation

The application SHALL be tested at standard breakpoints (desktop 900x700, tablet 768x600, mobile 360x640) to validate layout adaptation, readability, and functionality across form factors.

#### Scenario: Desktop validation

- **WHEN** application tested at 900x700 desktop resolution
- **THEN** all features display in desktop layout mode without layout issues or overlapping elements

#### Scenario: Tablet validation

- **WHEN** application tested at 768x600 tablet resolution
- **THEN** UI adapts to tablet mode with appropriate spacing and layout adjustments

#### Scenario: Mobile validation

- **WHEN** application tested at 360x640 mobile resolution
- **THEN** UI fully adapts to mobile mode with single-column layouts, touch-friendly controls, and complete functionality
