# SRS-11: User Interface & Experience

## 1. Overview
User Interface & Experience module defines the requirements for the web-based user interface, navigation, responsiveness, and user experience.

## 2. Functional Requirements

### 2.1 Layout & Navigation
**FR-UI-001**: System shall provide a consistent layout structure
- **Components**: Header, sidebar navigation, main content area, footer
- **Responsive**: Adapt to different screen sizes

**FR-UI-002**: System shall provide sidebar navigation
- **Features**: Collapsible sidebar, active route highlighting, icon-based navigation
- **Items**: Dashboard, Storage, Object Storage, Shares, Snapshots, Tape, iSCSI, Backup, Terminal, Monitoring, Alerts, System, IAM

**FR-UI-003**: System shall provide breadcrumb navigation
- **Features**: Hierarchical navigation path, clickable breadcrumbs

**FR-UI-004**: System shall provide user profile menu
- **Features**: User info, logout option, profile link

### 2.2 Authentication UI
**FR-UI-005**: System shall provide login page
- **Components**: Username input, password input, login button, error messages
- **Validation**: Real-time validation feedback

**FR-UI-006**: System shall handle authentication errors
- **Display**: Clear error messages for invalid credentials

**FR-UI-007**: System shall redirect authenticated users
- **Action**: Redirect to dashboard if already logged in

### 2.3 Dashboard
**FR-UI-008**: System shall provide system overview dashboard
- **Components**: System status, metrics cards, recent activity, quick actions
- **Refresh**: Auto-refresh metrics

**FR-UI-009**: System shall display system health indicators
- **Components**: Health status badge, component status indicators

### 2.4 Data Display
**FR-UI-010**: System shall provide table views
- **Features**: Sorting, filtering, pagination, search
- **Responsive**: Mobile-friendly table layout

**FR-UI-011**: System shall provide card-based layouts
- **Features**: Status indicators, quick actions, hover effects

**FR-UI-012**: System shall provide master-detail views
- **Features**: List on left, details on right, selection highlighting

### 2.5 Forms & Modals
**FR-UI-013**: System shall provide form inputs
- **Types**: Text, number, select, checkbox, radio, textarea, file
- **Validation**: Real-time validation, error messages

**FR-UI-014**: System shall provide modal dialogs
- **Features**: Overlay, close button, form submission, loading states

**FR-UI-015**: System shall provide confirmation dialogs
- **Features**: Warning messages, confirm/cancel actions

### 2.6 Feedback & Notifications
**FR-UI-016**: System shall provide loading states
- **Components**: Spinners, skeleton loaders, progress indicators

**FR-UI-017**: System shall provide success notifications
- **Display**: Toast notifications, inline success messages

**FR-UI-018**: System shall provide error notifications
- **Display**: Toast notifications, inline error messages, error pages

**FR-UI-019**: System shall provide warning notifications
- **Display**: Warning dialogs, warning badges

### 2.7 Charts & Visualizations
**FR-UI-020**: System shall provide metric charts
- **Types**: Line charts, bar charts, pie charts, gauge charts
- **Libraries**: Recharts integration

**FR-UI-021**: System shall provide real-time chart updates
- **Refresh**: Auto-refresh chart data

### 2.8 Responsive Design
**FR-UI-022**: System shall be responsive
- **Breakpoints**: Mobile (< 640px), Tablet (640px - 1024px), Desktop (> 1024px)
- **Adaptation**: Layout adjustments, menu collapse, touch-friendly controls

**FR-UI-023**: System shall support dark theme
- **Features**: Dark color scheme, theme persistence

### 2.9 Accessibility
**FR-UI-024**: System shall support keyboard navigation
- **Features**: Tab navigation, keyboard shortcuts, focus indicators

**FR-UI-025**: System shall provide ARIA labels
- **Features**: Screen reader support, semantic HTML

## 3. Design Requirements

### 3.1 Color Scheme
- **Primary**: #137fec (Blue)
- **Background Dark**: #101922
- **Surface Dark**: #18232e
- **Border Dark**: #2a3b4d
- **Text Primary**: White
- **Text Secondary**: #92adc9
- **Success**: Green (#10b981)
- **Warning**: Yellow (#f59e0b)
- **Error**: Red (#ef4444)

### 3.2 Typography
- **Font Family**: Manrope (Display), System fonts (Body)
- **Headings**: Bold, various sizes
- **Body**: Regular, readable sizes

### 3.3 Spacing
- **Consistent**: 4px base unit
- **Padding**: 16px, 24px, 32px
- **Gap**: 8px, 16px, 24px, 32px

### 3.4 Components
- **Buttons**: Primary, secondary, outline, danger variants
- **Cards**: Rounded corners, borders, shadows
- **Inputs**: Rounded, bordered, focus states
- **Badges**: Small, colored, with icons

## 4. User Experience Requirements

### 4.1 Performance
- **Page Load**: < 2 seconds initial load
- **Navigation**: < 100ms route transitions
- **API Calls**: Loading states during requests

### 4.2 Usability
- **Intuitive**: Clear navigation, obvious actions
- **Consistent**: Consistent patterns across pages
- **Feedback**: Immediate feedback for user actions
- **Error Handling**: Clear error messages and recovery options

### 4.3 Discoverability
- **Help**: Tooltips, help text, documentation links
- **Search**: Global search functionality (future)
- **Guides**: Onboarding flow (future)

## 5. Technology Stack

### 5.1 Frontend Framework
- React 18 with TypeScript
- Vite for build tooling
- React Router for navigation

### 5.2 Styling
- TailwindCSS for utility-first styling
- Custom CSS for specific components
- Dark theme support

### 5.3 State Management
- Zustand for global state
- TanStack Query for server state
- React hooks for local state

### 5.4 UI Libraries
- Lucide React for icons
- Recharts for charts
- Custom components

## 6. Browser Support
- Chrome/Edge: Latest 2 versions
- Firefox: Latest 2 versions
- Safari: Latest 2 versions

## 7. Error Handling
- Network errors: Retry mechanism, error messages
- Validation errors: Inline error messages
- Server errors: Error pages, error notifications
- 404 errors: Not found page