# UI Layout Specification

This document defines the layout structure, responsive behavior, and component constraints for Tatlock UI. It implements the "Rooms of the Estate" metaphor from [PHILOSOPHY.md](../PHILOSOPHY.md).

## Navigation Structure

The UI uses a **tabbed room navigation** in the header rather than a traditional sidebar. Each "room" represents a distinct usage context, reducing cognitive clutter.

| Room | Purpose | Chat Dock Default |
|------|---------|-------------------|
| **Front Hall** | Dashboard - estate overview, quick access, activity | Expanded |
| **Control Room** | Infrastructure - containers, stacks, monitoring | Collapsed |
| **Parlor** | Housekeeping - home automation, devices, scenes | Collapsed |
| **Library** | Knowledge - docs, notes, bookmarks (future) | Collapsed |

**Hidden for now:**
- **Study** - Secretarial tasks (email, calendaring) - future implementation

---

## Layout Structure

```
┌─────────────────────────────────────────────────────────────────────────────┐
│  HEADER BAR (56px, with logo bulge overlay)                                 │
│  [◯Logo◯] [Room Icons] ─────────────────────────────────── [Profile Menu]  │
├─────────────────────────────────────────────────────────────────────────────┤
│                                                                             │
│  ┌─────────────┐ ┌─────────────────────────────────┐ ┌───────────────────┐  │
│  │ NAV PANEL   │ │  PRIMARY CONTENT                │ │  CHAT DOCK        │  │
│  │             │ │                                 │ │                   │  │
│  │ Room-level  │ │  ┌──────────┐ ┌──────────────┐  │ │  Tatlock AI       │  │
│  │ navigation  │ │  │ FILTER   │ │ DATA GRID    │  │ │  assistant        │  │
│  │ (sections)  │ │  │ PANEL    │ │              │  │ │                   │  │
│  │             │ │  │          │ │              │  │ │  Persistent       │  │
│  │ 280px fixed │ │  │ Optional │ │ flex: 1      │  │ │  across rooms     │  │
│  │             │ │  │ 280px    │ │              │  │ │                   │  │
│  └─────────────┘ │  └──────────┘ └──────────────┘  │ │  280px-33vw       │  │
│                  │                                 │ │                   │  │
│                  │  flex: 1                        │ │  flex: 0          │  │
│                  └─────────────────────────────────┘ └───────────────────┘  │
│                                                                             │
└─────────────────────────────────────────────────────────────────────────────┘
```

---

## Panel Taxonomy

All panels share common styling patterns but serve different purposes.

### Panel Types

| Panel | Position | Purpose | Width | Content Alignment |
|-------|----------|---------|-------|-------------------|
| **Header Bar** | Top | Room nav, profile | 56px height | Logo in bulge, rest at bottom |
| **Nav Panel** | Left | Room-level section nav | 280px fixed | Header docked to bottom |
| **Filter Panel** | Left (inside content) | Data filtering/search | 280px fixed | Header docked to bottom |
| **Detail Panel** | Right (inside content) | Selected item details | 320-400px | Standard header |
| **Chat Dock** | Right | AI assistant | 280px-33vw | Standard header |

### Panel Header Behavior

All left-side panels (Nav Panel, Filter Panel) dock their header content to the **bottom** of the header area. This accommodates the logo bulge that overlays into their space.

```
┌─────────────────────────┐
│                         │  ← Logo bulge overlays this space
│         (empty)         │
│                         │
│  [Icon] Title   [Action]│  ← Content docked to bottom (8px margin)
├─────────────────────────┤
│  Panel content...       │
```

Right-side panels (Detail Panel, Chat Dock) use standard vertically-centered headers since the logo bulge doesn't reach them.

### Nav Panel Sections

Nav items can be organized into **sections**. Section headers are **conditionally visible** - they only appear when multiple sections exist.

#### Single Section (headers hidden)

When all items belong to one section, no headers are shown:

```
┌─────────────────────────┐
│  [≡] Sections     [···] │  ← Panel header
├─────────────────────────┤
│  ▸ Containers           │
│    Networks             │
│    Volumes              │
│    Images               │
│                         │
└─────────────────────────┘
```

#### Multiple Sections (headers visible)

When items span multiple sections, section headers appear:

```
┌─────────────────────────┐
│  [≡] Sections     [···] │  ← Panel header
├─────────────────────────┤
│ ▌Portainer              │  ← Section header (subtle bg, left accent)
│  ▸ Containers           │
│    Networks             │
│    Volumes              │
│    Images               │
│                         │
│ ▌NPM                    │  ← Section header
│    Proxy Hosts          │
│    Redirections         │
│    Streams              │
│                         │
│ ▌Authentik              │  ← Section header
│    Users                │
│    Groups               │
│    Applications         │
│                         │
└─────────────────────────┘
```

#### Section Header Styling

```
┌─────────────────────────┐
│▌SECTION NAME            │  ← Left accent bar (2px, primary color)
└─────────────────────────┘   ← Background: surfaceContainerHigh
                              ← Text: labelSmall, onSurfaceVariant
                              ← Padding: 8px horizontal, 6px vertical
                              ← All caps, letter-spacing: 0.5
```

#### Data Model

```dart
/// NavItem model (in nav_panel.dart)
class NavItem {
  final String id;
  final String label;
  final IconData icon;
  final String? section;  // null = ungrouped
}

// Section headers auto-generate from unique section values
// Visibility: items.map((i) => i.section).toSet().length > 1
```

#### Route Configuration Driven

Sections are defined in the feature's route configuration, not the widget:

```dart
/// In lib/features/control_room/router.dart

enum ControlRoomNav {
  // Portainer section
  containers('containers', 'Containers', Icons.dns, 'Portainer'),
  networks('networks', 'Networks', Icons.hub, 'Portainer'),
  volumes('volumes', 'Volumes', Icons.storage, 'Portainer'),
  images('images', 'Images', Icons.photo_library, 'Portainer'),
  // NPM section (future)
  proxyHosts('proxy-hosts', 'Proxy Hosts', Icons.public, 'NPM'),
  redirections('redirections', 'Redirections', Icons.alt_route, 'NPM'),
  // Authentik section (future)
  users('users', 'Users', Icons.people, 'Authentik'),
  groups('groups', 'Groups', Icons.group_work, 'Authentik');

  const ControlRoomNav(this.id, this.label, this.icon, this.section);

  final String id;
  final String label;
  final IconData icon;
  final String section;

  NavItem toNavItem() => NavItem(
        id: id,
        label: label,
        icon: icon,
        section: section,
      );
}
```

The NavPanel widget receives items and auto-generates section headers based on unique section values in the list. No section logic lives in the widget - it just renders what the route config provides.

---

## Panel Configurations by Room

### Front Hall

Front Hall uses a **three-mode content system** with a persistent QuickLinks panel:

| Mode | QuickLinks Panel | Content Area |
|------|------------------|--------------|
| **Dashboard** | Normal navigation | Dashboard widgets (stats, weather) |
| **Iframe** | Normal navigation | Embedded iframe content |
| **Settings** | Edit mode (back button, add new, overflow menus) | QuickLinkPage (EntityPageScaffold) |

#### Dashboard Mode (default)
```
┌──────────────┬─────────────────────────────────────────────────┬────────────┐
│ QUICK LINKS  │  PRIMARY CONTENT                                │ CHAT DOCK  │
│              │                                                 │ (expanded) │
│ ▌HOME        │  SYSTEM STATS                                   │            │
│   Jellyfin   │  ┌──────┐ ┌──────┐ ┌──────┐ ┌──────┐           │            │
│   WebUI      │  │ CPU  │ │ MEM  │ │ DISK │ │ NET  │           │            │
│              │  └──────┘ └──────┘ └──────┘ └──────┘           │            │
│ ▌AMP         │                                                 │            │
│   AMP Home   │  WEATHER              AIR QUALITY               │            │
│              │  ┌────────────────┐   ┌────────────────┐        │            │
│ ▌INFRA       │  │ 72°F Sunny     │   │ AQI: 42 Good   │        │            │
│   Netdata    │  └────────────────┘   └────────────────┘        │            │
│              │                                                 │            │
│ [⚙ Settings] │                                                 │            │
└──────────────┴─────────────────────────────────────────────────┴────────────┘
```

#### Iframe Mode
```
┌──────────────┬─────────────────────────────────────────────────┬────────────┐
│ QUICK LINKS  │ ┌─────────────────────────────────────────────┐ │ CHAT DOCK  │
│              │ │ Jellyfin          [↗] [⟳] [✕]              │ │ (collapsed)│
│ ▌HOME        │ ├─────────────────────────────────────────────┤ │            │
│  ▸Jellyfin   │ │                                             │ │            │
│   WebUI      │ │        <iframe src="jellyfin.url">          │ │            │
│              │ │                                             │ │            │
│ ▌AMP         │ │                                             │ │            │
│   AMP Home   │ │                                             │ │            │
│              │ │                                             │ │            │
│ ▌INFRA       │ │                                             │ │            │
│   Netdata    │ │                                             │ │            │
│              │ └─────────────────────────────────────────────┘ │            │
│ [⚙ Settings] │                                                 │            │
└──────────────┴─────────────────────────────────────────────────┴────────────┘
```

#### Settings Mode
```
┌──────────────┬─────────────────────────────────────────────────┬────────────┐
│ [←] Links    │ ┌─────────────────────────────────────────────┐ │ CHAT DOCK  │
│              │ │ ← Back    Edit Quick Link         [Save]    │ │ (collapsed)│
│ [+ Add New]  │ ├─────────────────────────────────────────────┤ │            │
├──────────────┤ │                                             │ │            │
│ ▌HOME        │ │  Name:     [Jellyfin_________________]      │ │            │
│  ▸Jellyfin ⋮ │ │                                             │ │            │
│   WebUI    ⋮ │ │  URL:      [https://jellyfin.schweitz...]   │ │            │
│              │ │                                             │ │            │
│ ▌AMP         │ │  Category: [Home ▼]                         │ │            │
│   AMP Home ⋮ │ │                                             │ │            │
│              │ │  Type:     ◉ Iframe  ○ New Tab              │ │            │
│ ▌INFRA       │ │                                             │ │            │
│   Netdata  ⋮ │ │  Icon:     [🎬 Pick...]                     │ │            │
│   Portainer⋮ │ │                                             │ │            │
│              │ │  Active:   [✓]                              │ │            │
└──────────────┴─────────────────────────────────────────────────┴────────────┘
```

**Settings mode panel behavior:**
- Back button in header (exits settings mode → dashboard)
- "+ Add New Link" button at top
- Each item has overflow menu (Edit, Delete, Move Up/Down)
- Clicking item selects it for editing in content area
- Uses EntityPageScaffold pattern (no modals)

### Control Room
```
┌───────────┬──────────────────────────────────────────────────────┬──────────┐
│ NAV PANEL │  PRIMARY CONTENT                                     │ CHAT     │
│           │  ┌────────────┬────────────────────────────────────┐ │ DOCK     │
│ Sections: │  │ FILTER     │ DATA GRID                          │ │          │
│ • Contai. │  │ PANEL      │ Container/Stack list               │ │ (collap- │
│ • Stacks  │  │            │                                    │ │  sed)    │
│ • Network │  │ Stack list │                                    │ │          │
│ • Volumes │  │ + search   │                                    │ │          │
└───────────┴──┴────────────┴────────────────────────────────────┴─┴──────────┘
```

### Parlor
```
┌───────────┬────────────────────────────────────────────────────┬────────────┐
│ NAV PANEL │  PRIMARY CONTENT                                   │ CHAT DOCK  │
│           │  Device controls, scenes                           │ (collapsed)│
│ Areas:    │                                                    │            │
│ • Living  │                                                    │            │
│ • Bedroom │                                                    │            │
│ • Kitchen │                                                    │            │
└───────────┴────────────────────────────────────────────────────┴────────────┘
```

---

## Component Roles

| Component | Flex | Description |
|-----------|------|-------------|
| **Header Bar** | intrinsic (56px) | Logo bulge, room icons, profile menu |
| **Nav Panel** | `flex: 0`, 280px | Room-level section navigation |
| **Filter Panel** | `flex: 0`, 280px | Data filtering within a section |
| **Primary Content** | `flex: 1` | Main working area |
| **Detail Panel** | `flex: 0`, 320-400px | Selected item details (optional) |
| **Chat Dock** | `flex: 0`, intrinsic | Tatlock assistant, collapsible |

---

## Responsive Breakpoints

### Wide (>= 1200px)

```
┌───────────┬─────────────────────────────────────────────┬────────────────────┐
│ NAV PANEL │  [Filter Panel]  [═══ Data Grid ═══]        │  CHAT DOCK         │
│ (280px)   │  (280px)         (flex: 1)                  │  (expanded, 320px) │
└───────────┴─────────────────────────────────────────────┴────────────────────┘
```

- All panels visible
- Chat dock expanded by default on Front Hall
- Nav panel visible with full labels
- Filter panel visible (where applicable)
- Full data grid columns

### Medium (>= 800px, < 1200px)

```
┌───────────┬───────────────────────────────────────────────────────────┬────┐
│ NAV PANEL │  [Filter Panel]  [═══════════ Data Grid ═══════════]      │ 💬 │
│ (280px)   │  (280px)         (flex: 1)                                │48px│
└───────────┴───────────────────────────────────────────────────────────┴────┘
```

- Chat dock collapsed to icon rail (48px)
- Click chat icon to expand as overlay
- Nav panel still visible
- Filter panel still visible
- Data grid may hide some columns

### Compact (>= 600px, < 800px)

```
┌────┬───────────────────────────────────────────────────────────────────┬────┐
│ ≡  │  [═══════════════════════ Content ═══════════════════════]        │ 💬 │
│48px│  Filter panel becomes top bar or collapsible                      │48px│
└────┴───────────────────────────────────────────────────────────────────┴────┘
```

- Nav panel collapses to icon rail (48px), expands as drawer on tap
- Filter panel moves to top of content or becomes collapsible
- Chat dock remains collapsed (48px)
- Data grid shows essential columns only

### Mobile (< 600px)

```
┌────────────────────────────────────────────────────────────────────────┐
│  HEADER: [≡] [Room Icons scroll] ─────────────────────────────── [💬] │
├────────────────────────────────────────────────────────────────────────┤
│                                                                        │
│  [═══════════════════════ Content ══════════════════════]              │
│  Filter as expandable section at top                                   │
│                                                                        │
└────────────────────────────────────────────────────────────────────────┘
```

- Single column layout
- Nav panel opens as full-screen drawer (hamburger menu)
- Filter panel becomes expandable section at top of content
- Chat opens as bottom sheet (60vh max)
- Data grid becomes card list or single-column table

---

## Panel Folding Summary

| Panel | Wide (≥1200) | Medium (≥800) | Compact (≥600) | Mobile (<600) |
|-------|--------------|---------------|----------------|---------------|
| **Nav Panel** | 280px visible | 280px visible | 48px rail → drawer | Hidden → drawer |
| **Filter Panel** | 280px visible | 280px visible | Collapsed/top bar | Expandable section |
| **Chat Dock** | 320px expanded | 48px rail → overlay | 48px rail → overlay | Icon → bottom sheet |
| **Detail Panel** | 320-400px slide-in | 320px slide-in | Full-width overlay | Full-screen |

---

## Component Constraints

| Component | Min Width | Max Width | Collapse Behavior |
|-----------|-----------|-----------|-------------------|
| Chat Dock (expanded) | 280px | 33vw | Collapses to icon rail |
| Chat Dock (collapsed) | 48px | 48px | - |
| Context Sidebar | 200px | - | Collapses to 56px icon rail, then drawer |
| Stat Card | 180px | 1fr | Grid reflows |
| Service Card | 120px | 1fr | Grid reflows |
| Data Grid | 400px | - | Horizontal scroll if needed |

---

## Room Wireframes

### Front Hall (Dashboard)

Primary landing page. Chat dock expanded by default.

```
┌─────────────────────────────────────────────────────────────┬─────────────────┐
│                                                             │                 │
│  STAT CARDS (auto-fit grid, min 180px)                      │  TATLOCK CHAT   │
│  ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌────────┐ │                 │
│  │ CPU         │ │ Memory      │ │ Disk        │ │Containe│ │  [conversation] │
│  │ 45%         │ │ 62%         │ │ 78%         │ │ 34/40  │ │                 │
│  │ ████████░░░ │ │ ██████████░ │ │ ███████████ │ │ ██████ │ │                 │
│  └─────────────┘ └─────────────┘ └─────────────┘ └────────┘ │                 │
│                                                             │                 │
│  QUICK ACCESS (auto-fill grid, min 120px)                   │                 │
│  ┌────────┐ ┌────────┐ ┌────────┐ ┌────────┐ ┌────────┐    │                 │
│  │ 🎬     │ │ 🔍     │ │ 📚     │ │ 🎮     │ │ 🌐     │    │                 │
│  │Jellyfin│ │SearXNG │ │ Wiki   │ │ AMP    │ │Requests│    │                 │
│  │● Online│ │● Online│ │● Online│ │● Online│ │● Online│    │                 │
│  └────────┘ └────────┘ └────────┘ └────────┘ └────────┘    │                 │
│                                                             │                 │
│  RECENT ACTIVITY                                            │  [input field]  │
│  ┌────────────────────────────────────────────────────────┐ │                 │
│  │ 📦 Container 'ollama' restarted            15 min ago  │ │                 │
│  │ 🏠 Living room set to evening mode          1 hr ago   │ │                 │
│  │ 🔄 System backup completed                  2 hrs ago  │ │                 │
│  └────────────────────────────────────────────────────────┘ │                 │
│                                                             │                 │
└─────────────────────────────────────────────────────────────┴─────────────────┘
```

**Components:**
- Stat Cards: CPU, Memory, Disk, Containers
- Quick Access: Service cards grid (external links)
- Recent Activity: Timeline of system events

---

### Control Room (Infrastructure)

Nav panel with grouped section navigation. Chat collapsed.

**Current state** (single grouper - headers hidden):
```
┌───────────────┬───────────────────────────────────────────────────────┬──────┐
│               │                                                       │      │
│  SECTIONS     │  CONTAINERS                        [Search] [+ New]   │  💬  │
│               │  ─────────────────────────────────────────────────── │      │
│  ▸ Containers │  ☑ NAME          STATUS    CPU    MEM    IMAGE    ⋮  │      │
│    Networks   │  ☐ jellyfin      ● Run     2.3%   1.2GB  latest   ⋮  │      │
│    Volumes    │  ☐ ollama        ● Run     45%    8.0GB  0.1.32   ⋮  │      │
│    Images     │  ☐ postgres      ● Run     1.1%   512MB  16-alp   ⋮  │      │
│               │  ☐ redis         ● Run     0.2%   128MB  7-alp    ⋮  │      │
│               │  ─────────────────────────────────────────────────── │      │
│               │  Showing 5 of 40                    < 1 2 3 4 5 >    │      │
│               │                                                       │      │
└───────────────┴───────────────────────────────────────────────────────┴──────┘
```

**Future state** (multiple groupers - headers visible):
```
┌───────────────┬───────────────────────────────────────────────────────┬──────┐
│               │                                                       │      │
│  SECTIONS     │  CONTAINERS                        [Search] [+ New]   │  💬  │
│               │  ─────────────────────────────────────────────────── │      │
│ ▌PORTAINER    │  ☑ NAME          STATUS    CPU    MEM    IMAGE    ⋮  │      │
│  ▸ Containers │  ☐ jellyfin      ● Run     2.3%   1.2GB  latest   ⋮  │      │
│    Networks   │  ☐ ollama        ● Run     45%    8.0GB  0.1.32   ⋮  │      │
│    Volumes    │  ─────────────────────────────────────────────────── │      │
│    Images     │  Showing 3 of 40                    < 1 2 3 4 5 >    │      │
│               │                                                       │      │
│ ▌NPM          │                                                       │      │
│    Proxy Hosts│                                                       │      │
│    Redirects  │                                                       │      │
│               │                                                       │      │
│ ▌AUTHENTIK    │                                                       │      │
│    Users      │                                                       │      │
│    Groups     │                                                       │      │
│               │                                                       │      │
└───────────────┴───────────────────────────────────────────────────────┴──────┘
```

**Components:**
- Nav Panel: Grouped section navigation (grouper headers conditional)
- Filter Panel: Stack/item filtering within section
- DataGrid: Container list with bulk actions
- Detail Panel: Opens on row selection (replaces grid or slides in)

---

### Parlor (Housekeeping)

Context sidebar with areas and scenes. Chat collapsed.

```
┌───────────────┬───────────────────────────────────────────────────────┬──────┐
│               │                                                       │      │
│  AREAS        │  LIVING ROOM                                          │  💬  │
│               │  ─────────────────────────────────────────────────── │      │
│  ▸ Living Rm  │                                                       │      │
│    Bedroom    │  ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ │      │
│    Kitchen    │  │ 💡       │ │ 📺       │ │ 🌡️       │ │ 🔌       │ │      │
│    Office     │  │ Ceiling  │ │ Samsung  │ │ Thermo   │ │ Outlet 1 │ │      │
│    Garage     │  │ 75%      │ │ OFF      │ │ 72°F     │ │ ON       │ │      │
│               │  │ ○─────●  │ │ [    ]   │ │ [-] [+]  │ │ [    ]   │ │      │
│  ──────────── │  └──────────┘ └──────────┘ └──────────┘ └──────────┘ │      │
│  SCENES       │                                                       │      │
│    🌅 Morning │  SCENES                                               │      │
│    ☀️ Day     │  ┌──────┐ ┌──────┐ ┌──────┐ ┌──────┐ ┌──────┐       │      │
│    🌆 Evening │  │ 🌅   │ │ ☀️   │ │ 🌆   │ │ 🌙   │ │ 🎬   │       │      │
│    🌙 Night   │  │ Morn │ │ Day  │ │ Eve  │ │Night │ │Movie │       │      │
│               │  └──────┘ └──────┘ └──────┘ └──────┘ └──────┘       │      │
└───────────────┴───────────────────────────────────────────────────────┴──────┘
```

**Components:**
- Context Sidebar: Area list + scene shortcuts
- Device Grid: Control tiles for current area
- Scene Bar: Quick activation buttons

---

## Grid Specifications

### Stat Cards

```css
grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
gap: 1rem;
```

| Viewport Width | Cards per Row |
|----------------|---------------|
| >= 900px | 4 |
| >= 720px | 3 |
| >= 540px | 2 |
| < 540px | 1 |

### Service Cards

```css
grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
gap: 0.75rem;
```

Reflows naturally based on available width.

---

## Chat Dock Behavior

The Tatlock chat assistant is **omnipresent** - accessible from any room.

| State | Width | Trigger |
|-------|-------|---------|
| Expanded | intrinsic (min 280px, max 33vw) | Default on Front Hall, click icon elsewhere |
| Collapsed | 48px (icon rail) | Default on other rooms, viewport < 1200px |
| Overlay | 90vw or 400px max | Expanded on medium viewports |
| Bottom Sheet | 100vw, 60vh max | Mobile viewports |
| **Fullscreen** | 100vw, 100vh | User-triggered overlay (future) |

**Persistence:** Conversation state persists across room navigation.

**Future:** Fullscreen mode provides an immersive chat experience as a modal overlay, independent of the current room.

---

## Flutter Implementation Notes

### Panel Widget Library

All panels are built from shared components in `lib/shared/layouts/widgets/`:

| Widget | File | Purpose |
|--------|------|---------|
| `PanelContainer` | `panel_container.dart` | Base container for all panels |
| `PanelHeader` | `panel_header.dart` | Configurable header (bottom-docked or centered) |
| `NavPanel` | `nav_panel.dart` | Left-side room navigation |
| `FilterPanel` | `filter_panel.dart` | Left-side data filtering |
| `DetailPanel` | `detail_panel.dart` | Right-side item details |
| `ChatDock` | `chat_dock.dart` | Right-side AI assistant |

### PanelHeader Configuration

```dart
/// Panel header with configurable content alignment.
class PanelHeader extends StatelessWidget {
  const PanelHeader({
    required this.title,
    required this.icon,
    this.actions,
    this.dockToBottom = false, // true for left-side panels
  });
}
```

**Left-side panels** (Nav, Filter) use `dockToBottom: true` to accommodate the logo bulge:
- Header height: 56px (matches app header)
- Content aligned to bottom with 8px margin
- Empty space at top allows logo bulge overlay

**Right-side panels** (Detail, Chat) use `dockToBottom: false`:
- Standard vertically-centered content
- No accommodation needed for logo bulge

### Recommended Widgets

| Concept | Flutter Widget |
|---------|----------------|
| Breakpoint detection | `LayoutBuilder`, `MediaQuery` |
| Main layout | `Row` with `Expanded` and `SizedBox` |
| Collapsible dock | `AnimatedContainer` or `AnimatedSize` |
| Grid layouts | `GridView.builder` with `SliverGridDelegateWithMaxCrossAxisExtent` |
| Drawer fallback | `Scaffold.drawer` or custom `Drawer` |
| Bottom sheet chat | `showModalBottomSheet` or `DraggableScrollableSheet` |

### Breakpoint Constants

```dart
abstract class Breakpoints {
  static const double mobile = 600;
  static const double compact = 800;
  static const double medium = 1200;
}
```

### Panel Width Constants

```dart
abstract class PanelWidths {
  static const double navPanel = 280;
  static const double filterPanel = 280;
  static const double detailPanel = 360;
  static const double chatDockExpanded = 320;
  static const double chatDockCollapsed = 48;
  static const double railWidth = 48;
}
```

### Layout Builder Pattern

```dart
LayoutBuilder(
  builder: (context, constraints) {
    if (constraints.maxWidth >= Breakpoints.medium) {
      return WideLayout(...);
    } else if (constraints.maxWidth >= Breakpoints.compact) {
      return MediumLayout(...);
    } else {
      return CompactLayout(...);
    }
  },
)
```

---

## Related Documents

- [PHILOSOPHY.md](../PHILOSOPHY.md) - "Rooms of the Estate" metaphor
- [ARCHITECTURE.md](./ARCHITECTURE.md) - Clean Architecture patterns
- [THEMING.md](./THEMING.md) - Material3 color scheme
- [DATAGRID.md](./DATAGRID.md) - DataGrid component API