diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..18318de
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,44 @@
+# Cameleer3 Design System
+
+## Before Building UI
+
+Always read `COMPONENT_GUIDE.md` before building any UI feature. It contains decision trees for choosing the right component, composition patterns, and the full component index.
+
+## Project Structure
+
+- `src/design-system/primitives/` — atomic UI components (Button, Input, Badge, etc.)
+- `src/design-system/composites/` — composed components (DataTable, Modal, Toast, etc.)
+- `src/design-system/layout/` — page-level layout (AppShell, Sidebar, TopBar)
+- `src/design-system/providers/` — ThemeProvider
+- `src/design-system/tokens.css` — all design tokens (colors, spacing, typography)
+- `src/pages/` — application pages
+- `src/pages/Inventory/` — component showcase at `/inventory`
+
+## Conventions
+
+### Styling
+- CSS Modules only — import as `import styles from './Component.module.css'`
+- Use tokens from `tokens.css` — never hardcode hex colors
+- All colors via CSS custom properties — supports light/dark via `[data-theme="dark"]`
+- No inline styles except dynamic values (width from props, etc.)
+
+### Components
+- `forwardRef` on all form controls (Input, Textarea, Select, Checkbox, Toggle, Label)
+- Every component accepts a `className` prop
+- Semantic color variants: `'success' | 'warning' | 'error'` pattern
+- Barrel exports: `src/design-system/primitives/index.ts` and `src/design-system/composites/index.ts`
+
+### Testing
+- Vitest + React Testing Library + happy-dom
+- Tests co-located: `Component.test.tsx` next to `Component.tsx`
+- Run: `npx vitest run` (all) or `npx vitest run src/path/to/Component` (single)
+- Wrap in `<ThemeProvider>` when component uses `useTheme()` or `hashColor()`
+
+### Import Paths
+```tsx
+import { Button, Input } from '../design-system/primitives'
+import { Modal, DataTable } from '../design-system/composites'
+import type { Column } from '../design-system/composites'
+import { AppShell } from '../design-system/layout/AppShell'
+import { ThemeProvider } from '../design-system/providers/ThemeProvider'
+```
diff --git a/COMPONENT_GUIDE.md b/COMPONENT_GUIDE.md
new file mode 100644
index 0000000..4424338
--- /dev/null
+++ b/COMPONENT_GUIDE.md
@@ -0,0 +1,218 @@
+# Cameleer3 Component Guide
+
+> This file is for Claude Code to reference when building UI features.
+> Keep it up to date when components are added or changed.
+
+## Quick Decision Trees
+
+### "I need to show a message to the user"
+- Inline contextual note → **InfoCallout**
+- Page-level attention banner → **Alert**
+- Temporary non-blocking feedback → **Toast** (via `useToast`)
+- Destructive action confirmation → **AlertDialog**
+- Generic dialog with custom content → **Modal**
+
+### "I need a form input"
+- Single line text → **Input**
+- Multiline text → **Textarea**
+- On/off toggle → **Toggle**
+- Yes/no with label → **Checkbox**
+- One of N options (≤5) → **RadioGroup** + **RadioItem**
+- One of N options (>5) → **Select**
+- Date/time → **DateTimePicker**
+- Date range → **DateRangePicker**
+- Wrap any input with label/error/hint → **FormField**
+
+### "I need to show loading state"
+- Full component placeholder → **Skeleton** (text, circular, or rectangular)
+- Inline spinner → **Spinner** (sm, md, lg)
+- Operation progress → **ProgressBar** (determinate or indeterminate)
+
+### "I need to show status"
+- Dot indicator → **StatusDot** (live, stale, dead, success, warning, error, running)
+- Labeled status → **Badge** with semantic color
+- Removable label → **Tag**
+
+### "I need navigation"
+- App-level sidebar nav → **Sidebar** (via AppShell)
+- Breadcrumb trail → **Breadcrumb**
+- Paginated data → **Pagination** (standalone) or **DataTable** (built-in pagination)
+- Hierarchical tree navigation → **TreeView**
+
+### "I need floating content"
+- Tooltip on hover → **Tooltip**
+- Click-triggered panel → **Popover**
+- Action menu → **Dropdown**
+- Full-screen search/command → **CommandPalette**
+
+### "I need to display data"
+- Key metrics → **StatCard** (with optional sparkline/trend)
+- Tabular data → **DataTable** (sortable, paginated)
+- Time series → **LineChart**, **AreaChart**
+- Categorical comparison → **BarChart**
+- Inline trend → **Sparkline**
+- Event log → **EventFeed**
+- Processing pipeline → **ProcessorTimeline**
+
+### "I need to organize content"
+- Collapsible sections (standalone) → **Collapsible**
+- Multiple collapsible sections (one/many open) → **Accordion**
+- Tabbed content → **Tabs**
+- Side panel inspector → **DetailPanel**
+- Section with title + action → **SectionHeader**
+- Empty content placeholder → **EmptyState**
+- Grouped content box → **Card** (with optional accent)
+
+### "I need to display text"
+- Code/JSON payload → **CodeBlock** (with line numbers, copy button)
+- Monospace inline text → **MonoText**
+- Keyboard shortcut hint → **KeyboardHint**
+
+### "I need to show people/users"
+- Single user avatar → **Avatar**
+- Stacked user avatars → **AvatarGroup**
+
+### "I need filtering"
+- Filter pill/chip → **FilterPill**
+- Full filter bar with search → **FilterBar**
+
+## Composition Patterns
+
+### Standard page layout
+```
+AppShell → Sidebar + TopBar + main content + optional DetailPanel
+```
+
+### Data page pattern
+```
+FilterBar (top)
+  → DataTable (center, with built-in sorting + pagination)
+  → optional DetailPanel (right slide, on row click)
+```
+
+### Form layout
+```
+FormField wraps any input (Input, Textarea, Select, RadioGroup, etc.)
+  provides: label, required indicator, hint text, error message
+  gap: 6px between label and input, 4px to hint/error
+```
+
+### KPI dashboard
+```
+Row of StatCard components (each with optional Sparkline and trend)
+Below: charts (AreaChart, LineChart, BarChart)
+```
+
+### Detail/inspector pattern
+```
+DetailPanel (right slide) with Tabs for sections
+  Each tab: Cards with data, CodeBlock for payloads,
+  ProcessorTimeline for execution flow
+```
+
+### Feedback flow
+```
+User action → Toast (success/error feedback)
+Destructive action → AlertDialog (confirmation) → Toast (result)
+```
+
+### Tree navigation pattern
+```
+TreeView for hierarchical data (Application → Routes → Processors)
+  onSelect navigates or opens DetailPanel
+```
+
+## Component Index
+
+| Component | Layer | When to use |
+|-----------|-------|-------------|
+| Accordion | composite | Multiple collapsible sections, single or multi-open mode |
+| Alert | primitive | Page-level attention banner with variant colors |
+| AlertDialog | composite | Confirmation dialog for destructive/important actions |
+| AreaChart | composite | Time series visualization with filled area |
+| Avatar | primitive | User representation with initials and color |
+| AvatarGroup | composite | Stacked overlapping avatars with overflow count |
+| Badge | primitive | Labeled status indicator with semantic colors |
+| BarChart | composite | Categorical data comparison, optional stacking |
+| Breadcrumb | composite | Navigation path showing current location |
+| Button | primitive | Action trigger (primary, secondary, danger, ghost) |
+| Card | primitive | Content container with optional accent border |
+| Checkbox | primitive | Boolean input with label |
+| CodeBlock | primitive | Syntax-highlighted code/JSON display |
+| Collapsible | primitive | Single expand/collapse section |
+| CommandPalette | composite | Full-screen search and command interface |
+| DataTable | composite | Sortable, paginated data table with row actions |
+| DateRangePicker | primitive | Date range selection with presets |
+| DateTimePicker | primitive | Single date/time input |
+| DetailPanel | composite | Slide-in side panel with tabs |
+| Dropdown | composite | Action menu triggered by any element |
+| EmptyState | primitive | Placeholder for empty content areas |
+| EventFeed | composite | Chronological event log with severity |
+| FilterBar | composite | Search + filter controls for data views |
+| FilterPill | primitive | Individual filter chip (active/inactive) |
+| FormField | primitive | Wrapper adding label, hint, error to any input |
+| InfoCallout | primitive | Inline contextual note with variant colors |
+| Input | primitive | Single-line text input with optional icon |
+| KeyboardHint | primitive | Keyboard shortcut display |
+| Label | primitive | Form label with optional required asterisk |
+| LineChart | composite | Time series line visualization |
+| MenuItem | composite | Sidebar navigation item with health/count |
+| Modal | composite | Generic dialog overlay with backdrop |
+| MonoText | primitive | Inline monospace text (xs, sm, md) |
+| Pagination | primitive | Page navigation controls |
+| Popover | composite | Click-triggered floating panel with arrow |
+| ProcessorTimeline | composite | Pipeline execution visualization |
+| ProgressBar | primitive | Determinate/indeterminate progress indicator |
+| RadioGroup | primitive | Single-select option group (use with RadioItem) |
+| RadioItem | primitive | Individual radio option within RadioGroup |
+| SectionHeader | primitive | Section title with optional action button |
+| Select | primitive | Dropdown select input |
+| ShortcutsBar | composite | Keyboard shortcuts reference bar |
+| Skeleton | primitive | Loading placeholder (text, circular, rectangular) |
+| Sparkline | primitive | Inline mini chart for trends |
+| Spinner | primitive | Animated loading indicator |
+| StatCard | primitive | KPI card with value, trend, optional sparkline |
+| StatusDot | primitive | Colored dot for status indication |
+| Tabs | composite | Tabbed content switcher with optional counts |
+| Tag | primitive | Removable colored label |
+| Textarea | primitive | Multi-line text input with resize control |
+| Toast | composite | Temporary notification (via ToastProvider + useToast) |
+| Toggle | primitive | On/off switch input |
+| Tooltip | primitive | Hover-triggered text tooltip |
+| TreeView | composite | Hierarchical tree with keyboard navigation |
+
+### Layout Components
+
+| Component | Purpose |
+|-----------|---------|
+| AppShell | Page shell: sidebar + topbar + main + optional detail panel |
+| Sidebar | App navigation with apps, routes, agents sections |
+| TopBar | Header bar with breadcrumb, environment, user info |
+
+## Import Paths
+
+```tsx
+// Primitives
+import { Button, Input, Badge, ... } from './design-system/primitives'
+
+// Composites
+import { DataTable, Modal, Toast, ... } from './design-system/composites'
+import type { Column, SearchResult, FeedEvent, ... } from './design-system/composites'
+
+// Layout
+import { AppShell } from './design-system/layout/AppShell'
+import { Sidebar } from './design-system/layout/Sidebar'
+import { TopBar } from './design-system/layout/TopBar'
+
+// Theme
+import { ThemeProvider, useTheme } from './design-system/providers/ThemeProvider'
+```
+
+## Styling Rules
+
+- **CSS Modules only** — no inline styles except dynamic values (width, color from props)
+- **Use existing tokens** from `tokens.css` — never hardcode hex colors
+- **Theme support** — all colors via CSS custom properties, never hardcode light/dark
+- **forwardRef** on all form controls (Input, Textarea, Select, Checkbox, Toggle, Label)
+- **className prop** on every component for style overrides
+- **Semantic color variants** — use `'success' | 'warning' | 'error'` pattern consistently
diff --git a/docs/superpowers/specs/2026-03-18-design-system-design.md b/docs/superpowers/specs/2026-03-18-design-system-design.md
index 7dc10d9..a577694 100644
--- a/docs/superpowers/specs/2026-03-18-design-system-design.md
+++ b/docs/superpowers/specs/2026-03-18-design-system-design.md
@@ -126,6 +126,7 @@ src/
 │   ├── utils/
 │   │   └── hashColor.ts            # Name → HSL deterministic color
 │   ├── primitives/
+│   │   ├── Alert/
 │   │   ├── Avatar/
 │   │   │   ├── Avatar.tsx
 │   │   │   └── Avatar.module.css
@@ -139,22 +140,32 @@ src/
 │   │   ├── DateRangePicker/
 │   │   ├── EmptyState/
 │   │   ├── FilterPill/
+│   │   ├── FormField/
 │   │   ├── InfoCallout/
 │   │   ├── Input/
 │   │   ├── KeyboardHint/
+│   │   ├── Label/
 │   │   ├── MonoText/
+│   │   ├── Pagination/
+│   │   ├── ProgressBar/
+│   │   ├── Radio/
 │   │   ├── Select/
 │   │   ├── SectionHeader/
+│   │   ├── Skeleton/
 │   │   ├── Sparkline/
 │   │   ├── Spinner/
 │   │   ├── StatCard/
 │   │   ├── StatusDot/
 │   │   ├── Tag/
+│   │   ├── Textarea/
 │   │   ├── Toggle/
 │   │   ├── Tooltip/
 │   │   └── index.ts                # Barrel export
 │   ├── composites/
+│   │   ├── Accordion/
+│   │   ├── AlertDialog/
 │   │   ├── AreaChart/
+│   │   ├── AvatarGroup/
 │   │   ├── BarChart/
 │   │   ├── Breadcrumb/
 │   │   ├── CommandPalette/
@@ -166,9 +177,12 @@ src/
 │   │   ├── LineChart/
 │   │   ├── MenuItem/
 │   │   ├── Modal/
+│   │   ├── Popover/
 │   │   ├── ProcessorTimeline/
 │   │   ├── ShortcutsBar/
 │   │   ├── Tabs/
+│   │   ├── Toast/
+│   │   ├── TreeView/
 │   │   └── index.ts
 │   ├── layout/
 │   │   ├── AppShell/
@@ -182,7 +196,8 @@ src/
 │   ├── Metrics/
 │   ├── RouteDetail/
 │   ├── ExchangeDetail/
-│   └── AgentHealth/
+│   ├── AgentHealth/
+│   └── Inventory/              # Component showcase at /inventory
 ├── mocks/                          # Static TypeScript mock data
 │   ├── exchanges.ts
 │   ├── routes.ts
@@ -351,6 +366,57 @@ All CSS custom properties for both themes. Light values sourced from `mock-v2-li
 - Color inherits from parent or explicit prop
 - Props: `data: number[]`, `color?: string`, `width?: number`, `height?: number`, `strokeWidth?: number`
 
+#### Alert
+- Inline page-level attention banner with variant colors
+- Left accent border (4px), variant background color, default icon per variant
+- Variants: `info`, `success`, `warning`, `error`
+- ARIA: `role="alert"` for error/warning, `role="status"` for info/success
+- Props: `variant?: 'info' | 'success' | 'warning' | 'error'`, `title?: string`, `children`, `dismissible?: boolean`, `onDismiss?`, `icon?: ReactNode`
+
+#### FormField
+- Wrapper component: Label + children slot + hint text + error text
+- Error replaces hint when both present; adds `.error` class to wrapper
+- Props: `label?: string`, `htmlFor?: string`, `required?: boolean`, `error?: string`, `hint?: string`, `children: ReactNode`
+
+#### Label
+- Form label with optional required asterisk (red `*`)
+- Font: `--font-body`, 12px, `--text-primary`, `font-weight: 500`
+- Uses `forwardRef`
+- Props: extends `LabelHTMLAttributes` + `required?: boolean`
+
+#### Pagination
+- Page navigation: `< 1 ... 4 [5] 6 ... 20 >`
+- Always shows first, last, and siblingCount pages around current
+- Active page: `--amber` background, white text
+- Props: `page: number`, `totalPages: number`, `onPageChange`, `siblingCount?: number`
+
+#### ProgressBar
+- Track with animated fill bar
+- Determinate (value 0-100) or indeterminate (shimmer animation)
+- Variants: primary, success, warning, error, running
+- Sizes: sm (4px height), md (8px height)
+- ARIA: `role="progressbar"`, `aria-valuenow`, `aria-valuemin`, `aria-valuemax`
+- Props: `value?: number`, `variant?`, `size?: 'sm' | 'md'`, `indeterminate?: boolean`, `label?: string`
+
+#### Radio (RadioGroup + RadioItem)
+- Single-select option group using React Context
+- Visual pattern matches Checkbox: hidden native input, custom circle with amber fill
+- Circle: 15px, `border-radius: 50%`, checked inner dot 7px
+- RadioGroup: `name`, `value`, `onChange`, `orientation?: 'vertical' | 'horizontal'`
+- RadioItem: `value`, `label: ReactNode`, `disabled?: boolean`
+
+#### Skeleton
+- Loading placeholder with shimmer animation
+- Variants: `text` (12px bars), `circular` (50% radius, 40x40 default), `rectangular` (full width, 80px default)
+- Multi-line text: `lines` prop, last line at 70% width
+- Props: `variant?`, `width?`, `height?`, `lines?: number`
+
+#### Textarea
+- Multi-line text input matching Input visual styling
+- Focus ring: amber border + amber-bg box-shadow
+- Uses `forwardRef`
+- Props: extends `TextareaHTMLAttributes` + `resize?: 'vertical' | 'horizontal' | 'none' | 'both'`
+
 ### 5.3 Composites
 
 #### Breadcrumb
@@ -469,6 +535,52 @@ All CSS custom properties for both themes. Light values sourced from `mock-v2-li
 - Each hint: `KeyboardHint` + description text
 - Props: `shortcuts: { keys: string; label: string }[]`
 
+#### Accordion
+- Multiple collapsible sections managed as a group
+- Uses Collapsible internally in controlled mode
+- Single mode (default): opening one closes others. Multiple mode: independent.
+- Container: `--border-subtle` border, `--radius-md`, sections separated by dividers
+- Props: `items: AccordionItem[]`, `multiple?: boolean`
+- `AccordionItem`: `{ id: string, title: ReactNode, content: ReactNode, defaultOpen?: boolean }`
+
+#### AlertDialog
+- Confirmation dialog for destructive/important actions, built on Modal
+- Fixed layout: icon area + title + description + button row
+- Variant-colored icon circle (danger=✕, warning=⚠, info=ℹ)
+- Auto-focuses Cancel button (safe default for destructive dialogs)
+- Props: `open`, `onClose`, `onConfirm`, `title`, `description`, `variant?: 'danger' | 'warning' | 'info'`, `loading?`
+
+#### AvatarGroup
+- Renders overlapping Avatar components with overflow count
+- Overlap: negative margin-left per size. Ring: 2px solid `--bg-surface`
+- Overflow circle: `--bg-inset` background, `--font-mono` 10px, `+N` text
+- Props: `names: string[]`, `max?: number`, `size?: 'sm' | 'md' | 'lg'`
+
+#### Popover
+- Click-triggered floating panel with CSS triangle arrow
+- Positions: top, bottom, left, right. Alignment: start, center, end
+- Closes on outside click or Esc. Uses `createPortal`.
+- Animation: opacity + scale, 150ms ease-out
+- Props: `trigger: ReactNode`, `content: ReactNode`, `position?`, `align?`
+
+#### Toast (ToastProvider + useToast)
+- App-level toast notification system via React Context
+- `ToastProvider` wraps the app; `useToast()` returns `{ toast, dismiss }`
+- `toast({ title, description?, variant?, duration? })` → returns id
+- Container: fixed bottom-right, z-index 1100, max 5 visible
+- Each toast: left accent border, variant icon, auto-dismiss (default 5000ms)
+- Slide-in animation from right, fade-out on dismiss
+
+#### TreeView
+- Hierarchical tree with recursive rendering and keyboard navigation
+- Controlled or uncontrolled expand state
+- Selected node: amber background + left border
+- Keyboard: arrows (navigate), left/right (collapse/expand), Enter (select), Home/End
+- Connector lines for visual hierarchy
+- ARIA: `role="tree"`, `role="treeitem"`, `aria-expanded`
+- Props: `nodes: TreeNode[]`, `onSelect?`, `selectedId?`, `expandedIds?`, `onToggle?`
+- `TreeNode`: `{ id, label, icon?, children?, meta? }`
+
 ### 5.4 Layout
 
 #### AppShell
@@ -509,6 +621,7 @@ Pages compose design system components with mock data. Each page is a route.
 | `/routes/:id`      | RouteDetail      | Per-route stats from `mock-v3-route-detail`      |
 | `/exchanges/:id`   | ExchangeDetail   | Message inspector from `mock-v3-exchange-detail` |
 | `/agents`          | AgentHealth      | Agent monitoring from `mock-v3-agent-health`     |
+| `/inventory`       | Inventory        | Component showcase with live interactive demos   |
 
 Pages are built after the design system layer is complete.
 
diff --git a/src/App.tsx b/src/App.tsx
index 4ac17ca..2107880 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -4,6 +4,7 @@ import { Metrics } from './pages/Metrics/Metrics'
 import { RouteDetail } from './pages/RouteDetail/RouteDetail'
 import { ExchangeDetail } from './pages/ExchangeDetail/ExchangeDetail'
 import { AgentHealth } from './pages/AgentHealth/AgentHealth'
+import { Inventory } from './pages/Inventory/Inventory'
 
 export default function App() {
   return (
@@ -13,6 +14,7 @@ export default function App() {
       <Route path="/routes/:id" element={<RouteDetail />} />
       <Route path="/exchanges/:id" element={<ExchangeDetail />} />
       <Route path="/agents" element={<AgentHealth />} />
+      <Route path="/inventory" element={<Inventory />} />
     </Routes>
   )
 }
diff --git a/src/design-system/composites/Accordion/Accordion.module.css b/src/design-system/composites/Accordion/Accordion.module.css
new file mode 100644
index 0000000..e87507a
--- /dev/null
+++ b/src/design-system/composites/Accordion/Accordion.module.css
@@ -0,0 +1,28 @@
+.root {
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-md);
+  overflow: hidden;
+}
+
+/* Override Collapsible's own border and radius for all items */
+.item {
+  border: none;
+  border-radius: 0;
+}
+
+/* Divider between items */
+.itemDivider {
+  border-top: 1px solid var(--border-subtle);
+}
+
+/* Restore border-radius on outer corners of first item */
+.itemFirst {
+  border-top-left-radius: var(--radius-md);
+  border-top-right-radius: var(--radius-md);
+}
+
+/* Restore border-radius on outer corners of last item */
+.itemLast {
+  border-bottom-left-radius: var(--radius-md);
+  border-bottom-right-radius: var(--radius-md);
+}
diff --git a/src/design-system/composites/Accordion/Accordion.test.tsx b/src/design-system/composites/Accordion/Accordion.test.tsx
new file mode 100644
index 0000000..9e24308
--- /dev/null
+++ b/src/design-system/composites/Accordion/Accordion.test.tsx
@@ -0,0 +1,105 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { Accordion } from './Accordion'
+import type { AccordionItem } from './Accordion'
+
+const items: AccordionItem[] = [
+  { id: 'a', title: 'Section A', content: 'Content A' },
+  { id: 'b', title: 'Section B', content: 'Content B' },
+  { id: 'c', title: 'Section C', content: 'Content C' },
+]
+
+describe('Accordion', () => {
+  it('renders all item titles', () => {
+    render(<Accordion items={items} />)
+    expect(screen.getByText('Section A')).toBeInTheDocument()
+    expect(screen.getByText('Section B')).toBeInTheDocument()
+    expect(screen.getByText('Section C')).toBeInTheDocument()
+  })
+
+  it('does not show content by default when no defaultOpen', () => {
+    render(<Accordion items={items} />)
+    expect(screen.queryByText('Content A')).not.toBeVisible()
+    expect(screen.queryByText('Content B')).not.toBeVisible()
+  })
+
+  it('shows content for defaultOpen items', () => {
+    const withDefault: AccordionItem[] = [
+      { id: 'a', title: 'Section A', content: 'Content A', defaultOpen: true },
+      { id: 'b', title: 'Section B', content: 'Content B' },
+    ]
+    render(<Accordion items={withDefault} />)
+    expect(screen.getByText('Content A')).toBeVisible()
+    expect(screen.queryByText('Content B')).not.toBeVisible()
+  })
+
+  describe('single mode (default)', () => {
+    it('opens a section when its trigger is clicked', async () => {
+      const user = userEvent.setup()
+      render(<Accordion items={items} />)
+      await user.click(screen.getByText('Section A'))
+      expect(screen.getByText('Content A')).toBeVisible()
+    })
+
+    it('closes other sections when a new one is opened', async () => {
+      const user = userEvent.setup()
+      render(<Accordion items={items} />)
+      await user.click(screen.getByText('Section A'))
+      expect(screen.getByText('Content A')).toBeVisible()
+      await user.click(screen.getByText('Section B'))
+      expect(screen.getByText('Content B')).toBeVisible()
+      expect(screen.queryByText('Content A')).not.toBeVisible()
+    })
+
+    it('closes the open section when clicking it again', async () => {
+      const user = userEvent.setup()
+      render(<Accordion items={items} />)
+      await user.click(screen.getByText('Section A'))
+      expect(screen.getByText('Content A')).toBeVisible()
+      await user.click(screen.getByText('Section A'))
+      expect(screen.queryByText('Content A')).not.toBeVisible()
+    })
+
+    it('only keeps first defaultOpen in single mode when multiple defaultOpen set', () => {
+      const withMultiDefault: AccordionItem[] = [
+        { id: 'a', title: 'Section A', content: 'Content A', defaultOpen: true },
+        { id: 'b', title: 'Section B', content: 'Content B', defaultOpen: true },
+      ]
+      render(<Accordion items={withMultiDefault} />)
+      expect(screen.getByText('Content A')).toBeVisible()
+      expect(screen.queryByText('Content B')).not.toBeVisible()
+    })
+  })
+
+  describe('multiple mode', () => {
+    it('allows multiple sections to be open simultaneously', async () => {
+      const user = userEvent.setup()
+      render(<Accordion items={items} multiple />)
+      await user.click(screen.getByText('Section A'))
+      await user.click(screen.getByText('Section B'))
+      expect(screen.getByText('Content A')).toBeVisible()
+      expect(screen.getByText('Content B')).toBeVisible()
+    })
+
+    it('toggles individual sections independently', async () => {
+      const user = userEvent.setup()
+      render(<Accordion items={items} multiple />)
+      await user.click(screen.getByText('Section A'))
+      await user.click(screen.getByText('Section B'))
+      await user.click(screen.getByText('Section A'))
+      expect(screen.queryByText('Content A')).not.toBeVisible()
+      expect(screen.getByText('Content B')).toBeVisible()
+    })
+
+    it('respects multiple defaultOpen items in multiple mode', () => {
+      const withMultiDefault: AccordionItem[] = [
+        { id: 'a', title: 'Section A', content: 'Content A', defaultOpen: true },
+        { id: 'b', title: 'Section B', content: 'Content B', defaultOpen: true },
+      ]
+      render(<Accordion items={withMultiDefault} multiple />)
+      expect(screen.getByText('Content A')).toBeVisible()
+      expect(screen.getByText('Content B')).toBeVisible()
+    })
+  })
+})
diff --git a/src/design-system/composites/Accordion/Accordion.tsx b/src/design-system/composites/Accordion/Accordion.tsx
new file mode 100644
index 0000000..510c8ee
--- /dev/null
+++ b/src/design-system/composites/Accordion/Accordion.tsx
@@ -0,0 +1,74 @@
+import { useState } from 'react'
+import type { ReactNode } from 'react'
+import { Collapsible } from '../../primitives/Collapsible/Collapsible'
+import styles from './Accordion.module.css'
+
+export interface AccordionItem {
+  id: string
+  title: ReactNode
+  content: ReactNode
+  defaultOpen?: boolean
+}
+
+interface AccordionProps {
+  items: AccordionItem[]
+  multiple?: boolean
+  className?: string
+}
+
+export function Accordion({ items, multiple = false, className }: AccordionProps) {
+  const [openIds, setOpenIds] = useState<Set<string>>(() => {
+    const initial = new Set<string>()
+    for (const item of items) {
+      if (item.defaultOpen) initial.add(item.id)
+    }
+    // In single mode, only keep the first defaultOpen item
+    if (!multiple && initial.size > 1) {
+      const first = [...initial][0]
+      return new Set([first])
+    }
+    return initial
+  })
+
+  function handleToggle(id: string, open: boolean) {
+    setOpenIds((prev) => {
+      const next = new Set(prev)
+      if (open) {
+        if (!multiple) next.clear()
+        next.add(id)
+      } else {
+        next.delete(id)
+      }
+      return next
+    })
+  }
+
+  return (
+    <div className={`${styles.root} ${className ?? ''}`}>
+      {items.map((item, index) => {
+        const isFirst = index === 0
+        const isLast = index === items.length - 1
+        const itemClass = [
+          styles.item,
+          isFirst ? styles.itemFirst : '',
+          isLast ? styles.itemLast : '',
+          index > 0 ? styles.itemDivider : '',
+        ]
+          .filter(Boolean)
+          .join(' ')
+
+        return (
+          <Collapsible
+            key={item.id}
+            title={item.title}
+            open={openIds.has(item.id)}
+            onToggle={(open) => handleToggle(item.id, open)}
+            className={itemClass}
+          >
+            {item.content}
+          </Collapsible>
+        )
+      })}
+    </div>
+  )
+}
diff --git a/src/design-system/composites/AlertDialog/AlertDialog.module.css b/src/design-system/composites/AlertDialog/AlertDialog.module.css
new file mode 100644
index 0000000..2b55378
--- /dev/null
+++ b/src/design-system/composites/AlertDialog/AlertDialog.module.css
@@ -0,0 +1,66 @@
+.content {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  text-align: center;
+  gap: 12px;
+  padding: 8px 0 4px;
+  font-family: var(--font-body);
+}
+
+/* Icon circle */
+.iconCircle {
+  width: 40px;
+  height: 40px;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  margin-bottom: 4px;
+}
+
+.danger {
+  background: var(--error-bg);
+  color: var(--error);
+}
+
+.warning {
+  background: var(--warning-bg);
+  color: var(--warning);
+}
+
+.info {
+  background: var(--running-bg);
+  color: var(--running);
+}
+
+.icon {
+  font-size: 18px;
+  line-height: 1;
+}
+
+/* Text */
+.title {
+  font-size: 16px;
+  font-weight: 600;
+  color: var(--text-primary);
+  margin: 0;
+  line-height: 1.3;
+}
+
+.description {
+  font-size: 14px;
+  color: var(--text-secondary);
+  margin: 0;
+  line-height: 1.5;
+}
+
+/* Button row */
+.buttonRow {
+  display: flex;
+  gap: 8px;
+  justify-content: flex-end;
+  width: 100%;
+  margin-top: 8px;
+}
diff --git a/src/design-system/composites/AlertDialog/AlertDialog.test.tsx b/src/design-system/composites/AlertDialog/AlertDialog.test.tsx
new file mode 100644
index 0000000..92d6881
--- /dev/null
+++ b/src/design-system/composites/AlertDialog/AlertDialog.test.tsx
@@ -0,0 +1,94 @@
+import { describe, it, expect, vi } from 'vitest'
+import { render, screen, waitFor } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { AlertDialog } from './AlertDialog'
+
+const defaultProps = {
+  open: true,
+  onClose: vi.fn(),
+  onConfirm: vi.fn(),
+  title: 'Delete item',
+  description: 'This action cannot be undone.',
+}
+
+describe('AlertDialog', () => {
+  it('renders title and description when open', () => {
+    render(<AlertDialog {...defaultProps} />)
+    expect(screen.getByText('Delete item')).toBeInTheDocument()
+    expect(screen.getByText('This action cannot be undone.')).toBeInTheDocument()
+  })
+
+  it('does not render when closed', () => {
+    render(<AlertDialog {...defaultProps} open={false} />)
+    expect(screen.queryByText('Delete item')).not.toBeInTheDocument()
+    expect(screen.queryByText('This action cannot be undone.')).not.toBeInTheDocument()
+  })
+
+  it('renders default button labels', () => {
+    render(<AlertDialog {...defaultProps} />)
+    expect(screen.getByRole('button', { name: 'Confirm' })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: 'Cancel' })).toBeInTheDocument()
+  })
+
+  it('renders custom button labels', () => {
+    render(<AlertDialog {...defaultProps} confirmLabel="Yes, delete" cancelLabel="No, keep" />)
+    expect(screen.getByRole('button', { name: 'Yes, delete' })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: 'No, keep' })).toBeInTheDocument()
+  })
+
+  it('calls onConfirm when confirm button is clicked', async () => {
+    const onConfirm = vi.fn()
+    const user = userEvent.setup()
+    render(<AlertDialog {...defaultProps} onConfirm={onConfirm} />)
+    await user.click(screen.getByRole('button', { name: 'Confirm' }))
+    expect(onConfirm).toHaveBeenCalledOnce()
+  })
+
+  it('calls onClose when cancel button is clicked', async () => {
+    const onClose = vi.fn()
+    const user = userEvent.setup()
+    render(<AlertDialog {...defaultProps} onClose={onClose} />)
+    await user.click(screen.getByRole('button', { name: 'Cancel' }))
+    expect(onClose).toHaveBeenCalledOnce()
+  })
+
+  it('calls onClose when Esc is pressed', async () => {
+    const onClose = vi.fn()
+    const user = userEvent.setup()
+    render(<AlertDialog {...defaultProps} onClose={onClose} />)
+    await user.keyboard('{Escape}')
+    expect(onClose).toHaveBeenCalled()
+  })
+
+  it('disables both buttons when loading', () => {
+    render(<AlertDialog {...defaultProps} loading />)
+    const buttons = screen.getAllByRole('button')
+    // Both cancel and confirm should be disabled
+    for (const btn of buttons) {
+      expect(btn).toBeDisabled()
+    }
+  })
+
+  it('auto-focuses cancel button on open', async () => {
+    render(<AlertDialog {...defaultProps} />)
+    await waitFor(() => {
+      expect(screen.getByRole('button', { name: 'Cancel' })).toHaveFocus()
+    })
+  })
+
+  it('renders danger variant icon', () => {
+    render(<AlertDialog {...defaultProps} variant="danger" />)
+    // Icon area should be present (aria-hidden)
+    expect(screen.getByText('✕')).toBeInTheDocument()
+  })
+
+  it('renders warning variant icon', () => {
+    render(<AlertDialog {...defaultProps} variant="warning" />)
+    expect(screen.getByText('⚠')).toBeInTheDocument()
+  })
+
+  it('renders info variant icon', () => {
+    render(<AlertDialog {...defaultProps} variant="info" />)
+    expect(screen.getByText('ℹ')).toBeInTheDocument()
+  })
+})
diff --git a/src/design-system/composites/AlertDialog/AlertDialog.tsx b/src/design-system/composites/AlertDialog/AlertDialog.tsx
new file mode 100644
index 0000000..3b3335c
--- /dev/null
+++ b/src/design-system/composites/AlertDialog/AlertDialog.tsx
@@ -0,0 +1,86 @@
+import { useEffect, useRef } from 'react'
+import { Modal } from '../Modal/Modal'
+import { Button } from '../../primitives/Button/Button'
+import styles from './AlertDialog.module.css'
+
+interface AlertDialogProps {
+  open: boolean
+  onClose: () => void
+  onConfirm: () => void
+  title: string
+  description: string
+  confirmLabel?: string
+  cancelLabel?: string
+  variant?: 'danger' | 'warning' | 'info'
+  loading?: boolean
+  className?: string
+}
+
+const variantIcons: Record<NonNullable<AlertDialogProps['variant']>, string> = {
+  danger: '✕',
+  warning: '⚠',
+  info: 'ℹ',
+}
+
+export function AlertDialog({
+  open,
+  onClose,
+  onConfirm,
+  title,
+  description,
+  confirmLabel = 'Confirm',
+  cancelLabel = 'Cancel',
+  variant = 'danger',
+  loading = false,
+  className,
+}: AlertDialogProps) {
+  const cancelWrapRef = useRef<HTMLSpanElement>(null)
+
+  useEffect(() => {
+    if (open) {
+      // Defer to allow Modal portal to render first
+      const id = setTimeout(() => {
+        const btn = cancelWrapRef.current?.querySelector('button')
+        btn?.focus()
+      }, 0)
+      return () => clearTimeout(id)
+    }
+  }, [open])
+
+  const confirmButtonVariant = variant === 'danger' ? 'danger' : 'primary'
+
+  return (
+    <Modal open={open} onClose={onClose} size="sm" className={className}>
+      <div className={styles.content}>
+        <div className={`${styles.iconCircle} ${styles[variant]}`} aria-hidden="true">
+          <span className={styles.icon}>{variantIcons[variant]}</span>
+        </div>
+
+        <h2 className={styles.title}>{title}</h2>
+        <p className={styles.description}>{description}</p>
+
+        <div className={styles.buttonRow}>
+          <span ref={cancelWrapRef}>
+            <Button
+              variant="secondary"
+              onClick={onClose}
+              disabled={loading}
+              type="button"
+            >
+              {cancelLabel}
+            </Button>
+          </span>
+          <Button
+            variant={confirmButtonVariant}
+            onClick={onConfirm}
+            loading={loading}
+            disabled={loading}
+            type="button"
+          >
+            {confirmLabel}
+          </Button>
+        </div>
+      </div>
+    </Modal>
+  )
+}
diff --git a/src/design-system/composites/AvatarGroup/AvatarGroup.module.css b/src/design-system/composites/AvatarGroup/AvatarGroup.module.css
new file mode 100644
index 0000000..fb7fc81
--- /dev/null
+++ b/src/design-system/composites/AvatarGroup/AvatarGroup.module.css
@@ -0,0 +1,58 @@
+.group {
+  display: inline-flex;
+  align-items: center;
+}
+
+/* Each avatar (except the first) overlaps the previous */
+.avatar {
+  margin-left: -8px;
+  outline: 2px solid var(--bg-surface);
+  border-radius: 50%;
+}
+
+.first {
+  margin-left: 0;
+}
+
+/* Size-specific overlap amounts */
+.sm .avatar {
+  margin-left: -6px;
+}
+
+.lg .avatar {
+  margin-left: -10px;
+}
+
+/* Overflow circle */
+.overflow {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 50%;
+  background-color: var(--bg-inset);
+  color: var(--text-secondary);
+  font-family: var(--font-mono);
+  font-size: 10px;
+  font-weight: 600;
+  flex-shrink: 0;
+  margin-left: -8px;
+  outline: 2px solid var(--bg-surface);
+}
+
+.overflow_sm {
+  width: 24px;
+  height: 24px;
+  margin-left: -6px;
+}
+
+.overflow_md {
+  width: 28px;
+  height: 28px;
+  margin-left: -8px;
+}
+
+.overflow_lg {
+  width: 40px;
+  height: 40px;
+  margin-left: -10px;
+}
diff --git a/src/design-system/composites/AvatarGroup/AvatarGroup.test.tsx b/src/design-system/composites/AvatarGroup/AvatarGroup.test.tsx
new file mode 100644
index 0000000..416d305
--- /dev/null
+++ b/src/design-system/composites/AvatarGroup/AvatarGroup.test.tsx
@@ -0,0 +1,60 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import { ThemeProvider } from '../../providers/ThemeProvider'
+import { AvatarGroup } from './AvatarGroup'
+
+const names = ['Alice Johnson', 'Bob Smith', 'Carol White', 'Dave Brown', 'Eve Davis']
+
+function renderGroup(props: React.ComponentProps<typeof AvatarGroup>) {
+  return render(
+    <ThemeProvider>
+      <AvatarGroup {...props} />
+    </ThemeProvider>
+  )
+}
+
+describe('AvatarGroup', () => {
+  it('renders max avatars (default 3) when count exceeds max', () => {
+    renderGroup({ names })
+    expect(screen.getByLabelText('Alice Johnson')).toBeInTheDocument()
+    expect(screen.getByLabelText('Bob Smith')).toBeInTheDocument()
+    expect(screen.getByLabelText('Carol White')).toBeInTheDocument()
+    expect(screen.queryByLabelText('Dave Brown')).not.toBeInTheDocument()
+    expect(screen.queryByLabelText('Eve Davis')).not.toBeInTheDocument()
+  })
+
+  it('shows +N overflow indicator for remaining avatars', () => {
+    renderGroup({ names })
+    // 5 names, max 3 => +2 overflow
+    expect(screen.getByText('+2')).toBeInTheDocument()
+  })
+
+  it('renders all avatars and no overflow when count <= max', () => {
+    renderGroup({ names: ['Alice Johnson', 'Bob Smith'], max: 3 })
+    expect(screen.getByLabelText('Alice Johnson')).toBeInTheDocument()
+    expect(screen.getByLabelText('Bob Smith')).toBeInTheDocument()
+    expect(screen.queryByText(/^\+/)).not.toBeInTheDocument()
+  })
+
+  it('respects a custom max prop', () => {
+    renderGroup({ names, max: 2 })
+    expect(screen.getByLabelText('Alice Johnson')).toBeInTheDocument()
+    expect(screen.getByLabelText('Bob Smith')).toBeInTheDocument()
+    expect(screen.queryByLabelText('Carol White')).not.toBeInTheDocument()
+    // 5 names, max 2 => +3 overflow
+    expect(screen.getByText('+3')).toBeInTheDocument()
+  })
+
+  it('accepts a size prop without errors', () => {
+    const { container } = renderGroup({ names, size: 'lg' })
+    expect(container.firstChild).toBeInTheDocument()
+  })
+
+  it('renders all avatars when count exactly equals max', () => {
+    renderGroup({ names: ['Alice Johnson', 'Bob Smith', 'Carol White'], max: 3 })
+    expect(screen.getByLabelText('Alice Johnson')).toBeInTheDocument()
+    expect(screen.getByLabelText('Bob Smith')).toBeInTheDocument()
+    expect(screen.getByLabelText('Carol White')).toBeInTheDocument()
+    expect(screen.queryByText(/^\+/)).not.toBeInTheDocument()
+  })
+})
diff --git a/src/design-system/composites/AvatarGroup/AvatarGroup.tsx b/src/design-system/composites/AvatarGroup/AvatarGroup.tsx
new file mode 100644
index 0000000..c6349ad
--- /dev/null
+++ b/src/design-system/composites/AvatarGroup/AvatarGroup.tsx
@@ -0,0 +1,32 @@
+import styles from './AvatarGroup.module.css'
+import { Avatar } from '../../primitives/Avatar/Avatar'
+
+interface AvatarGroupProps {
+  names: string[]
+  max?: number
+  size?: 'sm' | 'md' | 'lg'
+  className?: string
+}
+
+export function AvatarGroup({ names, max = 3, size = 'md', className }: AvatarGroupProps) {
+  const visible = names.slice(0, max)
+  const overflow = names.length - visible.length
+
+  return (
+    <span className={`${styles.group} ${styles[size]} ${className ?? ''}`}>
+      {visible.map((name, index) => (
+        <Avatar
+          key={`${name}-${index}`}
+          name={name}
+          size={size}
+          className={`${styles.avatar} ${index === 0 ? styles.first : ''}`}
+        />
+      ))}
+      {overflow > 0 && (
+        <span className={`${styles.overflow} ${styles[`overflow_${size}`]}`}>
+          +{overflow}
+        </span>
+      )}
+    </span>
+  )
+}
diff --git a/src/design-system/composites/Popover/Popover.module.css b/src/design-system/composites/Popover/Popover.module.css
new file mode 100644
index 0000000..05e192a
--- /dev/null
+++ b/src/design-system/composites/Popover/Popover.module.css
@@ -0,0 +1,107 @@
+.wrapper {
+  position: relative;
+  display: inline-block;
+}
+
+.trigger {
+  display: inline-flex;
+  cursor: pointer;
+}
+
+/* Portal-rendered content — positioned via inline style */
+.content {
+  position: absolute;
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-md);
+  box-shadow: var(--shadow-lg);
+  padding: 12px;
+  z-index: 500;
+  animation: popoverIn 150ms ease-out;
+  min-width: 160px;
+}
+
+@keyframes popoverIn {
+  from {
+    opacity: 0;
+    transform: scale(0.97);
+  }
+  to {
+    opacity: 1;
+    transform: scale(1);
+  }
+}
+
+/* ── Arrow ───────────────────────────────────────────────── */
+
+.arrow {
+  position: absolute;
+  width: 0;
+  height: 0;
+}
+
+/* Arrow pointing UP (content is below trigger) */
+.arrow-bottom {
+  top: -8px;
+  border-left: 8px solid transparent;
+  border-right: 8px solid transparent;
+  border-bottom: 8px solid var(--bg-surface);
+}
+
+/* Arrow pointing DOWN (content is above trigger) */
+.arrow-top {
+  bottom: -8px;
+  border-left: 8px solid transparent;
+  border-right: 8px solid transparent;
+  border-top: 8px solid var(--bg-surface);
+}
+
+/* Arrow pointing RIGHT (content is to the left of trigger) */
+.arrow-left {
+  right: -8px;
+  border-top: 8px solid transparent;
+  border-bottom: 8px solid transparent;
+  border-left: 8px solid var(--bg-surface);
+}
+
+/* Arrow pointing LEFT (content is to the right of trigger) */
+.arrow-right {
+  left: -8px;
+  border-top: 8px solid transparent;
+  border-bottom: 8px solid transparent;
+  border-right: 8px solid var(--bg-surface);
+}
+
+/* Arrow alignment for top/bottom positioned content */
+.position-bottom.align-start .arrow-bottom,
+.position-top.align-start .arrow-top {
+  left: 12px;
+}
+
+.position-bottom.align-center .arrow-bottom,
+.position-top.align-center .arrow-top {
+  left: 50%;
+  transform: translateX(-50%);
+}
+
+.position-bottom.align-end .arrow-bottom,
+.position-top.align-end .arrow-top {
+  right: 12px;
+}
+
+/* Arrow alignment for left/right positioned content */
+.position-left.align-start .arrow-left,
+.position-right.align-start .arrow-right {
+  top: 12px;
+}
+
+.position-left.align-center .arrow-left,
+.position-right.align-center .arrow-right {
+  top: 50%;
+  transform: translateY(-50%);
+}
+
+.position-left.align-end .arrow-left,
+.position-right.align-end .arrow-right {
+  bottom: 12px;
+}
diff --git a/src/design-system/composites/Popover/Popover.test.tsx b/src/design-system/composites/Popover/Popover.test.tsx
new file mode 100644
index 0000000..4b6f5f0
--- /dev/null
+++ b/src/design-system/composites/Popover/Popover.test.tsx
@@ -0,0 +1,108 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { Popover } from './Popover'
+
+describe('Popover', () => {
+  it('does not show content initially', () => {
+    render(
+      <Popover trigger={<button>Open</button>} content={<p>Popover content</p>} />,
+    )
+    expect(screen.queryByText('Popover content')).not.toBeInTheDocument()
+  })
+
+  it('shows content on trigger click', async () => {
+    const user = userEvent.setup()
+    render(
+      <Popover trigger={<button>Open</button>} content={<p>Popover content</p>} />,
+    )
+    await user.click(screen.getByText('Open'))
+    expect(screen.getByText('Popover content')).toBeInTheDocument()
+  })
+
+  it('toggles closed on second trigger click', async () => {
+    const user = userEvent.setup()
+    render(
+      <Popover trigger={<button>Open</button>} content={<p>Popover content</p>} />,
+    )
+    await user.click(screen.getByText('Open'))
+    expect(screen.getByText('Popover content')).toBeInTheDocument()
+    await user.click(screen.getByText('Open'))
+    expect(screen.queryByText('Popover content')).not.toBeInTheDocument()
+  })
+
+  it('closes on Esc key', async () => {
+    const user = userEvent.setup()
+    render(
+      <Popover trigger={<button>Open</button>} content={<p>Popover content</p>} />,
+    )
+    await user.click(screen.getByText('Open'))
+    expect(screen.getByText('Popover content')).toBeInTheDocument()
+    await user.keyboard('{Escape}')
+    expect(screen.queryByText('Popover content')).not.toBeInTheDocument()
+  })
+
+  it('closes on outside click', async () => {
+    const user = userEvent.setup()
+    render(
+      <div>
+        <Popover trigger={<button>Open</button>} content={<p>Popover content</p>} />
+        <button>Outside</button>
+      </div>,
+    )
+    await user.click(screen.getByText('Open'))
+    expect(screen.getByText('Popover content')).toBeInTheDocument()
+    await user.click(screen.getByText('Outside'))
+    expect(screen.queryByText('Popover content')).not.toBeInTheDocument()
+  })
+
+  it('renders content via portal into document.body', async () => {
+    const user = userEvent.setup()
+    render(
+      <Popover trigger={<button>Open</button>} content={<p>Popover content</p>} />,
+    )
+    await user.click(screen.getByText('Open'))
+    const contentEl = screen.getByTestId('popover-content')
+    expect(document.body.contains(contentEl)).toBe(true)
+  })
+
+  it('accepts position prop without error', async () => {
+    const user = userEvent.setup()
+    render(
+      <Popover
+        trigger={<button>Open</button>}
+        content={<p>Top content</p>}
+        position="top"
+      />,
+    )
+    await user.click(screen.getByText('Open'))
+    expect(screen.getByText('Top content')).toBeInTheDocument()
+  })
+
+  it('accepts align prop without error', async () => {
+    const user = userEvent.setup()
+    render(
+      <Popover
+        trigger={<button>Open</button>}
+        content={<p>Start aligned</p>}
+        position="bottom"
+        align="start"
+      />,
+    )
+    await user.click(screen.getByText('Open'))
+    expect(screen.getByText('Start aligned')).toBeInTheDocument()
+  })
+
+  it('does not close when clicking inside the content panel', async () => {
+    const user = userEvent.setup()
+    render(
+      <Popover
+        trigger={<button>Open</button>}
+        content={<button>Inner button</button>}
+      />,
+    )
+    await user.click(screen.getByText('Open'))
+    await user.click(screen.getByText('Inner button'))
+    expect(screen.getByText('Inner button')).toBeInTheDocument()
+  })
+})
diff --git a/src/design-system/composites/Popover/Popover.tsx b/src/design-system/composites/Popover/Popover.tsx
new file mode 100644
index 0000000..c534861
--- /dev/null
+++ b/src/design-system/composites/Popover/Popover.tsx
@@ -0,0 +1,146 @@
+import { useState, useEffect, useRef, useCallback, type ReactNode } from 'react'
+import { createPortal } from 'react-dom'
+import styles from './Popover.module.css'
+
+export interface PopoverProps {
+  trigger: ReactNode
+  content: ReactNode
+  position?: 'top' | 'bottom' | 'left' | 'right'
+  align?: 'start' | 'center' | 'end'
+  className?: string
+}
+
+interface ContentStyle {
+  top: number
+  left: number
+}
+
+function getContentStyle(
+  triggerRect: DOMRect,
+  contentEl: HTMLDivElement | null,
+  position: 'top' | 'bottom' | 'left' | 'right',
+  align: 'start' | 'center' | 'end',
+): ContentStyle {
+  const ARROW_SIZE = 8
+  const GAP = ARROW_SIZE + 4
+
+  const contentWidth = contentEl?.offsetWidth ?? 200
+  const contentHeight = contentEl?.offsetHeight ?? 100
+
+  let top = 0
+  let left = 0
+
+  // Main axis
+  if (position === 'bottom') {
+    top = triggerRect.bottom + window.scrollY + GAP
+  } else if (position === 'top') {
+    top = triggerRect.top + window.scrollY - contentHeight - GAP
+  } else if (position === 'left') {
+    left = triggerRect.left + window.scrollX - contentWidth - GAP
+  } else if (position === 'right') {
+    left = triggerRect.right + window.scrollX + GAP
+  }
+
+  // Cross axis alignment
+  if (position === 'top' || position === 'bottom') {
+    if (align === 'start') {
+      left = triggerRect.left + window.scrollX
+    } else if (align === 'center') {
+      left = triggerRect.left + window.scrollX + triggerRect.width / 2 - contentWidth / 2
+    } else {
+      left = triggerRect.right + window.scrollX - contentWidth
+    }
+  } else {
+    if (align === 'start') {
+      top = triggerRect.top + window.scrollY
+    } else if (align === 'center') {
+      top = triggerRect.top + window.scrollY + triggerRect.height / 2 - contentHeight / 2
+    } else {
+      top = triggerRect.bottom + window.scrollY - contentHeight
+    }
+  }
+
+  return { top, left }
+}
+
+export function Popover({
+  trigger,
+  content,
+  position = 'bottom',
+  align = 'center',
+  className,
+}: PopoverProps) {
+  const [open, setOpen] = useState(false)
+  const [style, setStyle] = useState<ContentStyle>({ top: 0, left: 0 })
+  const triggerRef = useRef<HTMLDivElement>(null)
+  const contentRef = useRef<HTMLDivElement>(null)
+
+  const recalculate = useCallback(() => {
+    if (!triggerRef.current) return
+    const rect = triggerRef.current.getBoundingClientRect()
+    setStyle(getContentStyle(rect, contentRef.current, position, align))
+  }, [position, align])
+
+  // Recalculate after content renders
+  useEffect(() => {
+    if (open) {
+      // Allow the DOM to paint once, then measure
+      const id = requestAnimationFrame(() => {
+        recalculate()
+      })
+      return () => cancelAnimationFrame(id)
+    }
+  }, [open, recalculate])
+
+  // Close on outside click
+  useEffect(() => {
+    if (!open) return
+    function handleMouseDown(e: MouseEvent) {
+      if (
+        triggerRef.current &&
+        !triggerRef.current.contains(e.target as Node) &&
+        contentRef.current &&
+        !contentRef.current.contains(e.target as Node)
+      ) {
+        setOpen(false)
+      }
+    }
+    document.addEventListener('mousedown', handleMouseDown)
+    return () => document.removeEventListener('mousedown', handleMouseDown)
+  }, [open])
+
+  // Close on Esc
+  useEffect(() => {
+    if (!open) return
+    function handleKey(e: KeyboardEvent) {
+      if (e.key === 'Escape') setOpen(false)
+    }
+    document.addEventListener('keydown', handleKey)
+    return () => document.removeEventListener('keydown', handleKey)
+  }, [open])
+
+  return (
+    <div ref={triggerRef} className={`${styles.wrapper} ${className ?? ''}`}>
+      <div
+        className={styles.trigger}
+        onClick={() => setOpen((prev) => !prev)}
+      >
+        {trigger}
+      </div>
+      {open &&
+        createPortal(
+          <div
+            ref={contentRef}
+            className={`${styles.content} ${styles[`position-${position}`]} ${styles[`align-${align}`]}`}
+            style={{ top: style.top, left: style.left }}
+            role="dialog"
+            data-testid="popover-content"
+          >
+            <div className={`${styles.arrow} ${styles[`arrow-${position}`]}`} aria-hidden="true" />
+            {content}
+          </div>,
+          document.body,
+        )}
+    </div>
+  )
+}
diff --git a/src/design-system/composites/Toast/Toast.module.css b/src/design-system/composites/Toast/Toast.module.css
new file mode 100644
index 0000000..df4735f
--- /dev/null
+++ b/src/design-system/composites/Toast/Toast.module.css
@@ -0,0 +1,144 @@
+/* ── Container ────────────────────────────────────────────────────────────── */
+
+.container {
+  position: fixed;
+  bottom: 16px;
+  right: 16px;
+  z-index: 1100;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  /* newest at bottom — column order matches DOM order */
+}
+
+/* ── Toast item ───────────────────────────────────────────────────────────── */
+
+.toast {
+  display: flex;
+  align-items: flex-start;
+  gap: 10px;
+  min-width: 300px;
+  max-width: 420px;
+  background: var(--bg-surface);
+  box-shadow: var(--shadow-lg);
+  border-radius: var(--radius-md);
+  padding: 12px 16px;
+  border-left: 4px solid transparent;
+  font-family: var(--font-body);
+  animation: slideIn 0.25s ease-out forwards;
+}
+
+.dismissing {
+  animation: fadeOut 0.3s ease-in forwards;
+}
+
+/* ── Variant accent colors ────────────────────────────────────────────────── */
+
+.success {
+  border-left-color: var(--success);
+}
+
+.success .icon {
+  color: var(--success);
+}
+
+.warning {
+  border-left-color: var(--warning);
+}
+
+.warning .icon {
+  color: var(--warning);
+}
+
+.error {
+  border-left-color: var(--error);
+}
+
+.error .icon {
+  color: var(--error);
+}
+
+.info {
+  border-left-color: var(--running);
+}
+
+.info .icon {
+  color: var(--running);
+}
+
+/* ── Icon ─────────────────────────────────────────────────────────────────── */
+
+.icon {
+  font-size: 15px;
+  line-height: 1.4;
+  flex-shrink: 0;
+}
+
+/* ── Content ──────────────────────────────────────────────────────────────── */
+
+.content {
+  flex: 1;
+  min-width: 0;
+}
+
+.title {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-primary);
+  line-height: 1.4;
+}
+
+.description {
+  font-size: 12px;
+  color: var(--text-secondary);
+  margin-top: 2px;
+  line-height: 1.4;
+}
+
+/* ── Close button ─────────────────────────────────────────────────────────── */
+
+.closeBtn {
+  width: 28px;
+  height: 28px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: none;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  color: var(--text-muted);
+  cursor: pointer;
+  font-size: 16px;
+  line-height: 1;
+  flex-shrink: 0;
+  transition: all 0.15s;
+}
+
+.closeBtn:hover {
+  color: var(--text-primary);
+  border-color: var(--text-faint);
+}
+
+/* ── Animations ───────────────────────────────────────────────────────────── */
+
+@keyframes slideIn {
+  from {
+    opacity: 0;
+    transform: translateX(100%);
+  }
+  to {
+    opacity: 1;
+    transform: translateX(0);
+  }
+}
+
+@keyframes fadeOut {
+  from {
+    opacity: 1;
+    transform: translateX(0);
+  }
+  to {
+    opacity: 0;
+    transform: translateX(100%);
+  }
+}
diff --git a/src/design-system/composites/Toast/Toast.test.tsx b/src/design-system/composites/Toast/Toast.test.tsx
new file mode 100644
index 0000000..430dca9
--- /dev/null
+++ b/src/design-system/composites/Toast/Toast.test.tsx
@@ -0,0 +1,252 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { render, screen, act, fireEvent } from '@testing-library/react'
+import { ToastProvider, useToast } from './Toast'
+
+// ── Helpers ───────────────────────────────────────────────────────────────
+
+/** Renders a ToastProvider and exposes the useToast API via a ref-like object */
+function renderProvider() {
+  let api!: ReturnType<typeof useToast>
+
+  function Consumer() {
+    api = useToast()
+    return null
+  }
+
+  render(
+    <ToastProvider>
+      <Consumer />
+    </ToastProvider>,
+  )
+
+  return { getApi: () => api }
+}
+
+// ── Tests ─────────────────────────────────────────────────────────────────
+
+describe('Toast', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+  })
+
+  afterEach(() => {
+    vi.runOnlyPendingTimers()
+    vi.useRealTimers()
+  })
+
+  it('shows a toast when toast() is called', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Hello', variant: 'info' }) })
+
+    expect(screen.getByTestId('toast')).toBeInTheDocument()
+    expect(screen.getByText('Hello')).toBeInTheDocument()
+  })
+
+  it('renders title and description', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Success!', variant: 'success', description: 'It worked.' }) })
+
+    expect(screen.getByText('Success!')).toBeInTheDocument()
+    expect(screen.getByText('It worked.')).toBeInTheDocument()
+  })
+
+  it('applies correct variant data attribute — error', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Error!', variant: 'error' }) })
+
+    expect(screen.getByTestId('toast')).toHaveAttribute('data-variant', 'error')
+  })
+
+  it('applies success variant', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Success!', variant: 'success' }) })
+
+    expect(screen.getByTestId('toast')).toHaveAttribute('data-variant', 'success')
+  })
+
+  it('applies warning variant', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Warning!', variant: 'warning' }) })
+
+    expect(screen.getByTestId('toast')).toHaveAttribute('data-variant', 'warning')
+  })
+
+  it('applies info variant by default when no variant given', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Default' }) })
+
+    expect(screen.getByTestId('toast')).toHaveAttribute('data-variant', 'info')
+  })
+
+  it('shows correct icon for info variant', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Info', variant: 'info' }) })
+
+    expect(screen.getByText('ℹ')).toBeInTheDocument()
+  })
+
+  it('shows correct icon for success variant', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'OK', variant: 'success' }) })
+
+    expect(screen.getByText('✓')).toBeInTheDocument()
+  })
+
+  it('shows correct icon for warning variant', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Warn', variant: 'warning' }) })
+
+    expect(screen.getByText('⚠')).toBeInTheDocument()
+  })
+
+  it('shows correct icon for error variant', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Err', variant: 'error' }) })
+
+    expect(screen.getByText('✕')).toBeInTheDocument()
+  })
+
+  it('dismisses toast when close button is clicked', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Closeable' }) })
+    expect(screen.getByTestId('toast')).toBeInTheDocument()
+
+    fireEvent.click(screen.getByLabelText('Dismiss notification'))
+
+    // After exit animation duration
+    act(() => { vi.advanceTimersByTime(300) })
+
+    expect(screen.queryByTestId('toast')).not.toBeInTheDocument()
+  })
+
+  it('auto-dismisses after default duration (5000ms)', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Auto' }) })
+    expect(screen.getByTestId('toast')).toBeInTheDocument()
+
+    // Advance past default duration + exit animation
+    act(() => { vi.advanceTimersByTime(5000 + 300) })
+
+    expect(screen.queryByTestId('toast')).not.toBeInTheDocument()
+  })
+
+  it('is still visible just before auto-dismiss fires', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Auto', duration: 1000 }) })
+
+    act(() => { vi.advanceTimersByTime(999) })
+
+    expect(screen.getByTestId('toast')).toBeInTheDocument()
+  })
+
+  it('auto-dismisses after custom duration', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Fast', duration: 1000 }) })
+
+    act(() => { vi.advanceTimersByTime(1000 + 300) })
+
+    expect(screen.queryByTestId('toast')).not.toBeInTheDocument()
+  })
+
+  it('renders multiple toasts', () => {
+    const { getApi } = renderProvider()
+
+    act(() => {
+      getApi().toast({ title: 'First', variant: 'info' })
+      getApi().toast({ title: 'Second', variant: 'error' })
+      getApi().toast({ title: 'Third', variant: 'warning' })
+    })
+
+    expect(screen.getAllByTestId('toast')).toHaveLength(3)
+  })
+
+  it('caps visible toasts at 5', () => {
+    const { getApi } = renderProvider()
+
+    act(() => {
+      for (let i = 0; i < 7; i++) {
+        getApi().toast({ title: `Toast ${i}` })
+      }
+    })
+
+    expect(screen.getAllByTestId('toast')).toHaveLength(5)
+  })
+
+  it('keeps newest 5 when capped', () => {
+    const { getApi } = renderProvider()
+
+    act(() => {
+      for (let i = 0; i < 7; i++) {
+        getApi().toast({ title: `Toast ${i}` })
+      }
+    })
+
+    // Toast 0 and 1 should be gone (oldest), Toast 2-6 remain
+    expect(screen.queryByText('Toast 0')).not.toBeInTheDocument()
+    expect(screen.queryByText('Toast 1')).not.toBeInTheDocument()
+    expect(screen.getByText('Toast 6')).toBeInTheDocument()
+  })
+
+  it('returns a string id from toast()', () => {
+    const { getApi } = renderProvider()
+
+    let id!: string
+    act(() => { id = getApi().toast({ title: 'Test' }) })
+
+    expect(typeof id).toBe('string')
+    expect(id.length).toBeGreaterThan(0)
+  })
+
+  it('dismiss() by id removes only the specified toast', () => {
+    const { getApi } = renderProvider()
+
+    let id1!: string
+    act(() => {
+      id1 = getApi().toast({ title: 'First' })
+      getApi().toast({ title: 'Second' })
+    })
+
+    expect(screen.getAllByTestId('toast')).toHaveLength(2)
+
+    act(() => { getApi().dismiss(id1) })
+    act(() => { vi.advanceTimersByTime(300) })
+
+    expect(screen.getAllByTestId('toast')).toHaveLength(1)
+    expect(screen.queryByText('First')).not.toBeInTheDocument()
+    expect(screen.getByText('Second')).toBeInTheDocument()
+  })
+
+  it('toast container has aria-live attribute', () => {
+    const { getApi } = renderProvider()
+
+    act(() => { getApi().toast({ title: 'Accessible' }) })
+
+    expect(screen.getByLabelText('Notifications')).toBeInTheDocument()
+    expect(screen.getByLabelText('Notifications')).toHaveAttribute('aria-live', 'polite')
+  })
+
+  it('throws if useToast is used outside ToastProvider', () => {
+    function BadComponent() {
+      useToast()
+      return null
+    }
+
+    const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+    expect(() => render(<BadComponent />)).toThrow('useToast must be used within a ToastProvider')
+    consoleSpy.mockRestore()
+  })
+})
diff --git a/src/design-system/composites/Toast/Toast.tsx b/src/design-system/composites/Toast/Toast.tsx
new file mode 100644
index 0000000..c5220a3
--- /dev/null
+++ b/src/design-system/composites/Toast/Toast.tsx
@@ -0,0 +1,190 @@
+import {
+  createContext,
+  useCallback,
+  useContext,
+  useEffect,
+  useRef,
+  useState,
+  type ReactNode,
+} from 'react'
+import { createPortal } from 'react-dom'
+import styles from './Toast.module.css'
+
+// ── Types ──────────────────────────────────────────────────────────────────
+
+export type ToastVariant = 'success' | 'warning' | 'error' | 'info'
+
+export interface ToastOptions {
+  title: string
+  description?: string
+  variant?: ToastVariant
+  duration?: number
+}
+
+interface ToastItem extends Required<Pick<ToastOptions, 'title' | 'variant' | 'duration'>> {
+  id: string
+  description?: string
+  /** when true, plays the exit animation before removal */
+  dismissing: boolean
+}
+
+interface ToastContextValue {
+  toast: (options: ToastOptions) => string
+  dismiss: (id: string) => void
+}
+
+// ── Constants ──────────────────────────────────────────────────────────────
+
+const MAX_TOASTS = 5
+const DEFAULT_DURATION = 5000
+const EXIT_ANIMATION_MS = 300
+
+const ICONS: Record<ToastVariant, string> = {
+  info: 'ℹ',
+  success: '✓',
+  warning: '⚠',
+  error: '✕',
+}
+
+// ── Context ────────────────────────────────────────────────────────────────
+
+const ToastContext = createContext<ToastContextValue | null>(null)
+
+// ── ToastProvider ──────────────────────────────────────────────────────────
+
+export function ToastProvider({ children }: { children: ReactNode }) {
+  const [toasts, setToasts] = useState<ToastItem[]>([])
+  const timersRef = useRef<Map<string, ReturnType<typeof setTimeout>>>(new Map())
+
+  const dismiss = useCallback((id: string) => {
+    // Clear auto-dismiss timer if running
+    const timer = timersRef.current.get(id)
+    if (timer !== undefined) {
+      clearTimeout(timer)
+      timersRef.current.delete(id)
+    }
+
+    // Mark as dismissing (triggers exit animation)
+    setToasts((prev) =>
+      prev.map((t) => (t.id === id ? { ...t, dismissing: true } : t)),
+    )
+
+    // Remove after animation completes
+    setTimeout(() => {
+      setToasts((prev) => prev.filter((t) => t.id !== id))
+    }, EXIT_ANIMATION_MS)
+  }, [])
+
+  const toast = useCallback(
+    (options: ToastOptions): string => {
+      const id = `toast-${Date.now()}-${Math.random().toString(36).slice(2, 7)}`
+      const duration = options.duration ?? DEFAULT_DURATION
+      const variant = options.variant ?? 'info'
+
+      const newToast: ToastItem = {
+        id,
+        title: options.title,
+        description: options.description,
+        variant,
+        duration,
+        dismissing: false,
+      }
+
+      setToasts((prev) => {
+        const next = [...prev, newToast]
+        // Keep only the last MAX_TOASTS entries (newest at the end)
+        return next.slice(-MAX_TOASTS)
+      })
+
+      // Schedule auto-dismiss
+      const timer = setTimeout(() => {
+        dismiss(id)
+      }, duration)
+      timersRef.current.set(id, timer)
+
+      return id
+    },
+    [dismiss],
+  )
+
+  // Clean up all timers on unmount
+  useEffect(() => {
+    const timers = timersRef.current
+    return () => {
+      timers.forEach(clearTimeout)
+    }
+  }, [])
+
+  return (
+    <ToastContext.Provider value={{ toast, dismiss }}>
+      {children}
+      <ToastContainer toasts={toasts} onDismiss={dismiss} />
+    </ToastContext.Provider>
+  )
+}
+
+// ── useToast ───────────────────────────────────────────────────────────────
+
+export function useToast(): ToastContextValue {
+  const ctx = useContext(ToastContext)
+  if (!ctx) {
+    throw new Error('useToast must be used within a ToastProvider')
+  }
+  return ctx
+}
+
+// ── ToastContainer (portal) ────────────────────────────────────────────────
+
+interface ToastContainerProps {
+  toasts: ToastItem[]
+  onDismiss: (id: string) => void
+}
+
+function ToastContainer({ toasts, onDismiss }: ToastContainerProps) {
+  if (toasts.length === 0) return null
+
+  return createPortal(
+    <div className={styles.container} aria-live="polite" aria-label="Notifications">
+      {toasts.map((t) => (
+        <ToastItemComponent key={t.id} toast={t} onDismiss={onDismiss} />
+      ))}
+    </div>,
+    document.body,
+  )
+}
+
+// ── ToastItem ──────────────────────────────────────────────────────────────
+
+interface ToastItemComponentProps {
+  toast: ToastItem
+  onDismiss: (id: string) => void
+}
+
+function ToastItemComponent({ toast, onDismiss }: ToastItemComponentProps) {
+  return (
+    <div
+      className={`${styles.toast} ${styles[toast.variant]} ${toast.dismissing ? styles.dismissing : ''}`}
+      role="alert"
+      data-testid="toast"
+      data-variant={toast.variant}
+    >
+      <span className={styles.icon} aria-hidden="true">
+        {ICONS[toast.variant]}
+      </span>
+      <div className={styles.content}>
+        <div className={styles.title}>{toast.title}</div>
+        {toast.description && (
+          <div className={styles.description}>{toast.description}</div>
+        )}
+      </div>
+      <button
+        className={styles.closeBtn}
+        onClick={() => onDismiss(toast.id)}
+        aria-label="Dismiss notification"
+        type="button"
+      >
+        &times;
+      </button>
+    </div>
+  )
+}
diff --git a/src/design-system/composites/TreeView/TreeView.module.css b/src/design-system/composites/TreeView/TreeView.module.css
new file mode 100644
index 0000000..bbfa6b4
--- /dev/null
+++ b/src/design-system/composites/TreeView/TreeView.module.css
@@ -0,0 +1,99 @@
+.root {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  font-family: var(--font-body);
+  font-size: 14px;
+  color: var(--text-primary);
+  outline: none;
+}
+
+.children {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+
+.row {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  padding-top: 4px;
+  padding-bottom: 4px;
+  padding-right: 8px;
+  cursor: pointer;
+  border-left: 3px solid transparent;
+  border-radius: 0 4px 4px 0;
+  user-select: none;
+  outline: none;
+  position: relative;
+  min-height: 28px;
+}
+
+.row:hover {
+  background: var(--bg-hover);
+}
+
+.row:focus-visible {
+  outline: 2px solid var(--amber);
+  outline-offset: -2px;
+}
+
+.selected {
+  background: var(--amber-bg);
+  border-left-color: var(--amber);
+  color: var(--amber-deep);
+}
+
+.selected:hover {
+  background: var(--amber-bg);
+}
+
+/* Chevron slot — reserves space so leaf nodes align with parent icons */
+.chevronSlot {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 16px;
+  flex-shrink: 0;
+}
+
+.chevron {
+  font-size: 10px;
+  color: var(--text-muted);
+  line-height: 1;
+}
+
+.selected .chevron {
+  color: var(--amber-deep);
+}
+
+.icon {
+  display: inline-flex;
+  align-items: center;
+  flex-shrink: 0;
+  font-size: 14px;
+}
+
+.label {
+  flex: 1;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.meta {
+  font-family: var(--font-mono);
+  font-size: 10px;
+  color: var(--text-muted);
+  margin-left: auto;
+  padding-left: 8px;
+  flex-shrink: 0;
+  white-space: nowrap;
+}
+
+.selected .meta {
+  color: var(--amber-deep);
+  opacity: 0.8;
+}
diff --git a/src/design-system/composites/TreeView/TreeView.test.tsx b/src/design-system/composites/TreeView/TreeView.test.tsx
new file mode 100644
index 0000000..f7e31ec
--- /dev/null
+++ b/src/design-system/composites/TreeView/TreeView.test.tsx
@@ -0,0 +1,302 @@
+import { describe, it, expect, vi } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { TreeView } from './TreeView'
+import type { TreeNode } from './TreeView'
+
+const nodes: TreeNode[] = [
+  {
+    id: 'root1',
+    label: 'Root One',
+    children: [
+      {
+        id: 'child1',
+        label: 'Child One',
+        meta: 'meta-a',
+        children: [
+          { id: 'grandchild1', label: 'Grandchild One' },
+          { id: 'grandchild2', label: 'Grandchild Two' },
+        ],
+      },
+      { id: 'child2', label: 'Child Two', icon: <span>★</span> },
+    ],
+  },
+  {
+    id: 'root2',
+    label: 'Root Two',
+  },
+]
+
+describe('TreeView', () => {
+  describe('rendering', () => {
+    it('renders top-level nodes', () => {
+      render(<TreeView nodes={nodes} />)
+      expect(screen.getByText('Root One')).toBeInTheDocument()
+      expect(screen.getByText('Root Two')).toBeInTheDocument()
+    })
+
+    it('does not render children of collapsed nodes', () => {
+      render(<TreeView nodes={nodes} />)
+      expect(screen.queryByText('Child One')).not.toBeInTheDocument()
+      expect(screen.queryByText('Child Two')).not.toBeInTheDocument()
+    })
+
+    it('renders icon when provided', () => {
+      render(<TreeView nodes={nodes} expandedIds={['root1']} onToggle={() => {}} />)
+      expect(screen.getByText('★')).toBeInTheDocument()
+    })
+
+    it('renders meta text when provided', () => {
+      render(<TreeView nodes={nodes} expandedIds={['root1']} onToggle={() => {}} />)
+      expect(screen.getByText('meta-a')).toBeInTheDocument()
+    })
+
+    it('shows chevron on parent nodes', () => {
+      render(<TreeView nodes={nodes} />)
+      // Root One has children so should have a chevron
+      const treeitem = screen.getByRole('treeitem', { name: /Root One/i })
+      expect(treeitem.textContent).toContain('▸')
+    })
+
+    it('shows no chevron on leaf nodes', () => {
+      render(<TreeView nodes={nodes} />)
+      // Root Two is a leaf
+      const treeitem = screen.getByRole('treeitem', { name: /Root Two/i })
+      expect(treeitem.textContent).not.toContain('▸')
+      expect(treeitem.textContent).not.toContain('▾')
+    })
+  })
+
+  describe('ARIA attributes', () => {
+    it('has role="tree" on root element', () => {
+      render(<TreeView nodes={nodes} />)
+      expect(screen.getByRole('tree')).toBeInTheDocument()
+    })
+
+    it('has role="treeitem" on each node row', () => {
+      render(<TreeView nodes={nodes} />)
+      const items = screen.getAllByRole('treeitem')
+      expect(items.length).toBeGreaterThanOrEqual(2)
+    })
+
+    it('sets aria-expanded="false" on collapsed parent nodes', () => {
+      render(<TreeView nodes={nodes} />)
+      const treeitem = screen.getByRole('treeitem', { name: /Root One/i })
+      expect(treeitem).toHaveAttribute('aria-expanded', 'false')
+    })
+
+    it('sets aria-expanded="true" on expanded parent nodes', () => {
+      render(<TreeView nodes={nodes} expandedIds={['root1']} onToggle={() => {}} />)
+      const treeitem = screen.getByRole('treeitem', { name: /Root One/i })
+      expect(treeitem).toHaveAttribute('aria-expanded', 'true')
+    })
+
+    it('does not set aria-expanded on leaf nodes', () => {
+      render(<TreeView nodes={nodes} />)
+      const treeitem = screen.getByRole('treeitem', { name: /Root Two/i })
+      expect(treeitem).not.toHaveAttribute('aria-expanded')
+    })
+
+    it('sets aria-selected on selected node', () => {
+      render(<TreeView nodes={nodes} selectedId="root2" />)
+      const treeitem = screen.getByRole('treeitem', { name: /Root Two/i })
+      expect(treeitem).toHaveAttribute('aria-selected', 'true')
+    })
+  })
+
+  describe('expand / collapse (uncontrolled)', () => {
+    it('expands a collapsed parent on click', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      await user.click(screen.getByRole('treeitem', { name: /Root One/i }))
+      expect(screen.getByText('Child One')).toBeInTheDocument()
+      expect(screen.getByText('Child Two')).toBeInTheDocument()
+    })
+
+    it('collapses an expanded parent on second click', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      await user.click(rootOne)
+      expect(screen.getByText('Child One')).toBeInTheDocument()
+      await user.click(rootOne)
+      expect(screen.queryByText('Child One')).not.toBeInTheDocument()
+    })
+
+    it('shows expanded chevron when expanded', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      await user.click(rootOne)
+      expect(rootOne.textContent).toContain('▾')
+    })
+  })
+
+  describe('expand / collapse (controlled)', () => {
+    it('renders children based on controlled expandedIds', () => {
+      render(
+        <TreeView nodes={nodes} expandedIds={['root1']} onToggle={() => {}} />,
+      )
+      expect(screen.getByText('Child One')).toBeInTheDocument()
+    })
+
+    it('calls onToggle with node id when parent is clicked', async () => {
+      const onToggle = vi.fn()
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} expandedIds={[]} onToggle={onToggle} />)
+      await user.click(screen.getByRole('treeitem', { name: /Root One/i }))
+      expect(onToggle).toHaveBeenCalledWith('root1')
+    })
+
+    it('does not call onToggle when leaf is clicked', async () => {
+      const onToggle = vi.fn()
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} expandedIds={[]} onToggle={onToggle} />)
+      await user.click(screen.getByRole('treeitem', { name: /Root Two/i }))
+      expect(onToggle).not.toHaveBeenCalled()
+    })
+  })
+
+  describe('selection', () => {
+    it('calls onSelect with node id when a node is clicked', async () => {
+      const onSelect = vi.fn()
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} onSelect={onSelect} />)
+      await user.click(screen.getByRole('treeitem', { name: /Root Two/i }))
+      expect(onSelect).toHaveBeenCalledWith('root2')
+    })
+
+    it('calls onSelect for parent nodes too', async () => {
+      const onSelect = vi.fn()
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} onSelect={onSelect} />)
+      await user.click(screen.getByRole('treeitem', { name: /Root One/i }))
+      expect(onSelect).toHaveBeenCalledWith('root1')
+    })
+
+    it('marks the selected node visually', () => {
+      render(<TreeView nodes={nodes} selectedId="root2" />)
+      const treeitem = screen.getByRole('treeitem', { name: /Root Two/i })
+      expect(treeitem.getAttribute('aria-selected')).toBe('true')
+    })
+  })
+
+  describe('keyboard navigation', () => {
+    it('moves focus down with ArrowDown', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      rootOne.focus()
+      await user.keyboard('{ArrowDown}')
+      expect(screen.getByRole('treeitem', { name: /Root Two/i })).toHaveFocus()
+    })
+
+    it('moves focus up with ArrowUp', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootTwo = screen.getByRole('treeitem', { name: /Root Two/i })
+      rootTwo.focus()
+      await user.keyboard('{ArrowUp}')
+      expect(screen.getByRole('treeitem', { name: /Root One/i })).toHaveFocus()
+    })
+
+    it('expands a collapsed node with ArrowRight', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      rootOne.focus()
+      await user.keyboard('{ArrowRight}')
+      expect(screen.getByText('Child One')).toBeInTheDocument()
+    })
+
+    it('moves to first child with ArrowRight when already expanded', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      rootOne.focus()
+      // First ArrowRight expands, second moves to first child
+      await user.keyboard('{ArrowRight}')
+      await user.keyboard('{ArrowRight}')
+      expect(screen.getByRole('treeitem', { name: /Child One/i })).toHaveFocus()
+    })
+
+    it('collapses an expanded node with ArrowLeft', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      rootOne.focus()
+      await user.keyboard('{ArrowRight}')
+      expect(screen.getByText('Child One')).toBeInTheDocument()
+      await user.keyboard('{ArrowLeft}')
+      expect(screen.queryByText('Child One')).not.toBeInTheDocument()
+    })
+
+    it('moves to parent with ArrowLeft on a child node', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      rootOne.focus()
+      // Expand root1 then move to child
+      await user.keyboard('{ArrowRight}')
+      await user.keyboard('{ArrowRight}')
+      // Now at Child One
+      expect(screen.getByRole('treeitem', { name: /Child One/i })).toHaveFocus()
+      await user.keyboard('{ArrowLeft}')
+      // Should move back to Root One
+      expect(rootOne).toHaveFocus()
+    })
+
+    it('selects focused node with Enter', async () => {
+      const onSelect = vi.fn()
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} onSelect={onSelect} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      rootOne.focus()
+      await user.keyboard('{Enter}')
+      expect(onSelect).toHaveBeenCalledWith('root1')
+    })
+
+    it('moves to first visible node with Home', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootTwo = screen.getByRole('treeitem', { name: /Root Two/i })
+      rootTwo.focus()
+      await user.keyboard('{Home}')
+      expect(screen.getByRole('treeitem', { name: /Root One/i })).toHaveFocus()
+    })
+
+    it('moves to last visible node with End', async () => {
+      const user = userEvent.setup()
+      render(<TreeView nodes={nodes} />)
+      const rootOne = screen.getByRole('treeitem', { name: /Root One/i })
+      rootOne.focus()
+      await user.keyboard('{End}')
+      expect(screen.getByRole('treeitem', { name: /Root Two/i })).toHaveFocus()
+    })
+  })
+
+  describe('deep nesting', () => {
+    it('renders grandchildren when both ancestor nodes are expanded', () => {
+      render(
+        <TreeView
+          nodes={nodes}
+          expandedIds={['root1', 'child1']}
+          onToggle={() => {}}
+        />,
+      )
+      expect(screen.getByText('Grandchild One')).toBeInTheDocument()
+      expect(screen.getByText('Grandchild Two')).toBeInTheDocument()
+    })
+
+    it('does not render grandchildren when parent is collapsed', () => {
+      render(
+        <TreeView
+          nodes={nodes}
+          expandedIds={['root1']}
+          onToggle={() => {}}
+        />,
+      )
+      expect(screen.queryByText('Grandchild One')).not.toBeInTheDocument()
+    })
+  })
+})
diff --git a/src/design-system/composites/TreeView/TreeView.tsx b/src/design-system/composites/TreeView/TreeView.tsx
new file mode 100644
index 0000000..f16d2fa
--- /dev/null
+++ b/src/design-system/composites/TreeView/TreeView.tsx
@@ -0,0 +1,289 @@
+import { useState, useRef, useCallback, type ReactNode, type KeyboardEvent } from 'react'
+import styles from './TreeView.module.css'
+
+export interface TreeNode {
+  id: string
+  label: string
+  icon?: ReactNode
+  children?: TreeNode[]
+  meta?: string
+}
+
+interface FlatNode {
+  node: TreeNode
+  depth: number
+  parentId: string | null
+}
+
+function flattenVisibleNodes(
+  nodes: TreeNode[],
+  expandedIds: Set<string>,
+  depth = 0,
+  parentId: string | null = null,
+): FlatNode[] {
+  const result: FlatNode[] = []
+  for (const node of nodes) {
+    result.push({ node, depth, parentId })
+    if (node.children && node.children.length > 0 && expandedIds.has(node.id)) {
+      result.push(...flattenVisibleNodes(node.children, expandedIds, depth + 1, node.id))
+    }
+  }
+  return result
+}
+
+interface TreeViewProps {
+  nodes: TreeNode[]
+  onSelect?: (id: string) => void
+  selectedId?: string
+  expandedIds?: string[]
+  onToggle?: (id: string) => void
+  className?: string
+}
+
+export function TreeView({
+  nodes,
+  onSelect,
+  selectedId,
+  expandedIds: controlledExpandedIds,
+  onToggle,
+  className,
+}: TreeViewProps) {
+  // Controlled vs uncontrolled expansion
+  const isControlled = controlledExpandedIds !== undefined && onToggle !== undefined
+  const [internalExpandedIds, setInternalExpandedIds] = useState<Set<string>>(new Set())
+
+  const expandedSet = isControlled
+    ? new Set(controlledExpandedIds)
+    : internalExpandedIds
+
+  function handleToggle(id: string) {
+    if (isControlled) {
+      onToggle!(id)
+    } else {
+      setInternalExpandedIds((prev) => {
+        const next = new Set(prev)
+        if (next.has(id)) {
+          next.delete(id)
+        } else {
+          next.add(id)
+        }
+        return next
+      })
+    }
+  }
+
+  // Keyboard navigation
+  const [focusedId, setFocusedId] = useState<string | null>(null)
+  const treeRef = useRef<HTMLUListElement>(null)
+
+  const visibleNodes = flattenVisibleNodes(nodes, expandedSet)
+
+  function getFocusedIndex() {
+    if (focusedId === null) return -1
+    return visibleNodes.findIndex((fn) => fn.node.id === focusedId)
+  }
+
+  function focusNode(id: string) {
+    // We focus the element directly. All tree items have tabIndex={-1} by default
+    // which means programmatic focus works even without tabIndex=0.
+    // The element's onFocus handler will fire and call setFocusedId — but that
+    // happens synchronously within the React event so it's properly batched.
+    const el = treeRef.current?.querySelector(`[data-nodeid="${id}"]`) as HTMLElement | null
+    if (el) {
+      // Temporarily make focusable if not already
+      el.focus()
+    } else {
+      // Element not in DOM yet (e.g. after expand); update state so it renders
+      // with tabIndex=0 and the browser's next focus movement will work.
+      setFocusedId(id)
+    }
+  }
+
+  const handleKeyDown = useCallback(
+    (e: KeyboardEvent<HTMLUListElement>) => {
+      const currentIndex = getFocusedIndex()
+      const current = visibleNodes[currentIndex]
+
+      switch (e.key) {
+        case 'ArrowDown': {
+          e.preventDefault()
+          const next = visibleNodes[currentIndex + 1]
+          if (next) focusNode(next.node.id)
+          break
+        }
+        case 'ArrowUp': {
+          e.preventDefault()
+          const prev = visibleNodes[currentIndex - 1]
+          if (prev) focusNode(prev.node.id)
+          break
+        }
+        case 'ArrowRight': {
+          e.preventDefault()
+          if (!current) break
+          const hasChildren = current.node.children && current.node.children.length > 0
+          if (hasChildren) {
+            if (!expandedSet.has(current.node.id)) {
+              // Expand it
+              handleToggle(current.node.id)
+            } else {
+              // Move to first child (it will be the next visible node)
+              const next = visibleNodes[currentIndex + 1]
+              if (next) focusNode(next.node.id)
+            }
+          }
+          break
+        }
+        case 'ArrowLeft': {
+          e.preventDefault()
+          if (!current) break
+          const hasChildren = current.node.children && current.node.children.length > 0
+          if (hasChildren && expandedSet.has(current.node.id)) {
+            // Collapse
+            handleToggle(current.node.id)
+          } else if (current.parentId !== null) {
+            // Move to parent
+            focusNode(current.parentId)
+          }
+          break
+        }
+        case 'Enter': {
+          e.preventDefault()
+          if (current) {
+            onSelect?.(current.node.id)
+          }
+          break
+        }
+        case 'Home': {
+          e.preventDefault()
+          if (visibleNodes.length > 0) {
+            focusNode(visibleNodes[0].node.id)
+          }
+          break
+        }
+        case 'End': {
+          e.preventDefault()
+          if (visibleNodes.length > 0) {
+            focusNode(visibleNodes[visibleNodes.length - 1].node.id)
+          }
+          break
+        }
+      }
+    },
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+    [visibleNodes, expandedSet, focusedId],
+  )
+
+  return (
+    <ul
+      ref={treeRef}
+      role="tree"
+      className={`${styles.root} ${className ?? ''}`}
+      onKeyDown={handleKeyDown}
+    >
+      {nodes.map((node) => (
+        <TreeNodeRow
+          key={node.id}
+          node={node}
+          depth={0}
+          expandedSet={expandedSet}
+          selectedId={selectedId}
+          focusedId={focusedId}
+          onToggle={handleToggle}
+          onSelect={onSelect}
+          onFocus={setFocusedId}
+        />
+      ))}
+    </ul>
+  )
+}
+
+interface TreeNodeRowProps {
+  node: TreeNode
+  depth: number
+  expandedSet: Set<string>
+  selectedId?: string
+  focusedId: string | null
+  onToggle: (id: string) => void
+  onSelect?: (id: string) => void
+  onFocus: (id: string) => void
+}
+
+function TreeNodeRow({
+  node,
+  depth,
+  expandedSet,
+  selectedId,
+  focusedId,
+  onToggle,
+  onSelect,
+  onFocus,
+}: TreeNodeRowProps) {
+  const hasChildren = node.children && node.children.length > 0
+  const isExpanded = expandedSet.has(node.id)
+  const isSelected = selectedId === node.id
+  const isFocused = focusedId === node.id
+
+  function handleClick() {
+    if (hasChildren) {
+      onToggle(node.id)
+    }
+    onSelect?.(node.id)
+  }
+
+  const rowClass = [
+    styles.row,
+    isSelected ? styles.selected : '',
+  ]
+    .filter(Boolean)
+    .join(' ')
+
+  return (
+    <li role="none">
+      <div
+        role="treeitem"
+        aria-expanded={hasChildren ? isExpanded : undefined}
+        aria-selected={isSelected}
+        tabIndex={isFocused || (focusedId === null && depth === 0 && node === node) ? 0 : -1}
+        data-nodeid={node.id}
+        className={rowClass}
+        style={{ paddingLeft: `${depth * 16 + 8}px` }}
+        onClick={handleClick}
+        onFocus={() => onFocus(node.id)}
+      >
+        <span className={styles.chevronSlot}>
+          {hasChildren ? (
+            <span className={styles.chevron} aria-hidden="true">
+              {isExpanded ? '▾' : '▸'}
+            </span>
+          ) : null}
+        </span>
+        {node.icon && (
+          <span className={styles.icon} aria-hidden="true">
+            {node.icon}
+          </span>
+        )}
+        <span className={styles.label}>{node.label}</span>
+        {node.meta && (
+          <span className={styles.meta}>{node.meta}</span>
+        )}
+      </div>
+      {hasChildren && isExpanded && (
+        <ul role="group" className={styles.children}>
+          {node.children!.map((child) => (
+            <TreeNodeRow
+              key={child.id}
+              node={child}
+              depth={depth + 1}
+              expandedSet={expandedSet}
+              selectedId={selectedId}
+              focusedId={focusedId}
+              onToggle={onToggle}
+              onSelect={onSelect}
+              onFocus={onFocus}
+            />
+          ))}
+        </ul>
+      )}
+    </li>
+  )
+}
diff --git a/src/design-system/composites/index.ts b/src/design-system/composites/index.ts
index 427f40d..cd07917 100644
--- a/src/design-system/composites/index.ts
+++ b/src/design-system/composites/index.ts
@@ -1,4 +1,7 @@
+export { Accordion } from './Accordion/Accordion'
+export { AlertDialog } from './AlertDialog/AlertDialog'
 export { AreaChart } from './AreaChart/AreaChart'
+export { AvatarGroup } from './AvatarGroup/AvatarGroup'
 export { BarChart } from './BarChart/BarChart'
 export { Breadcrumb } from './Breadcrumb/Breadcrumb'
 export { CommandPalette } from './CommandPalette/CommandPalette'
@@ -13,7 +16,10 @@ export { FilterBar } from './FilterBar/FilterBar'
 export { LineChart } from './LineChart/LineChart'
 export { MenuItem } from './MenuItem/MenuItem'
 export { Modal } from './Modal/Modal'
+export { Popover } from './Popover/Popover'
 export { ProcessorTimeline } from './ProcessorTimeline/ProcessorTimeline'
 export type { ProcessorStep } from './ProcessorTimeline/ProcessorTimeline'
 export { ShortcutsBar } from './ShortcutsBar/ShortcutsBar'
 export { Tabs } from './Tabs/Tabs'
+export { ToastProvider, useToast } from './Toast/Toast'
+export { TreeView } from './TreeView/TreeView'
diff --git a/src/design-system/primitives/Alert/Alert.module.css b/src/design-system/primitives/Alert/Alert.module.css
new file mode 100644
index 0000000..0fcaff1
--- /dev/null
+++ b/src/design-system/primitives/Alert/Alert.module.css
@@ -0,0 +1,93 @@
+.alert {
+  display: flex;
+  align-items: flex-start;
+  gap: 10px;
+  width: 100%;
+  border-radius: var(--radius-md);
+  padding: 12px 16px;
+  border-left: 4px solid transparent;
+  box-sizing: border-box;
+  font-family: var(--font-body);
+  position: relative;
+}
+
+/* Variants */
+.info {
+  background: var(--running-bg);
+  border-left-color: var(--running);
+}
+
+.success {
+  background: var(--success-bg);
+  border-left-color: var(--success);
+}
+
+.warning {
+  background: var(--warning-bg);
+  border-left-color: var(--warning);
+}
+
+.error {
+  background: var(--error-bg);
+  border-left-color: var(--error);
+}
+
+/* Icon */
+.icon {
+  flex-shrink: 0;
+  font-size: 14px;
+  line-height: 1.4;
+}
+
+.info .icon    { color: var(--running); }
+.success .icon { color: var(--success); }
+.warning .icon { color: var(--warning); }
+.error .icon   { color: var(--error); }
+
+/* Content */
+.content {
+  flex: 1;
+  min-width: 0;
+}
+
+.title {
+  font-size: 13px;
+  font-weight: 600;
+  line-height: 1.4;
+  margin-bottom: 2px;
+}
+
+.info .title    { color: var(--running); }
+.success .title { color: var(--success); }
+.warning .title { color: var(--warning); }
+.error .title   { color: var(--error); }
+
+.body {
+  font-size: 12px;
+  color: var(--text-secondary);
+  line-height: 1.5;
+}
+
+/* Dismiss button */
+.dismissBtn {
+  flex-shrink: 0;
+  width: 24px;
+  height: 24px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: none;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  color: var(--text-muted);
+  cursor: pointer;
+  font-size: 14px;
+  padding: 0;
+  line-height: 1;
+  margin-left: auto;
+}
+
+.dismissBtn:hover {
+  background: var(--border);
+  color: var(--text-primary, var(--text-secondary));
+}
diff --git a/src/design-system/primitives/Alert/Alert.test.tsx b/src/design-system/primitives/Alert/Alert.test.tsx
new file mode 100644
index 0000000..50d72a1
--- /dev/null
+++ b/src/design-system/primitives/Alert/Alert.test.tsx
@@ -0,0 +1,100 @@
+import { describe, it, expect, vi } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { Alert } from './Alert'
+
+describe('Alert', () => {
+  it('renders children', () => {
+    render(<Alert>Something went wrong</Alert>)
+    expect(screen.getByText('Something went wrong')).toBeInTheDocument()
+  })
+
+  it('renders title when provided', () => {
+    render(<Alert title="Heads up">Body text</Alert>)
+    expect(screen.getByText('Heads up')).toBeInTheDocument()
+    expect(screen.getByText('Body text')).toBeInTheDocument()
+  })
+
+  it('renders without title', () => {
+    render(<Alert>Just a message</Alert>)
+    expect(screen.getByText('Just a message')).toBeInTheDocument()
+  })
+
+  it('uses role="alert" for error variant', () => {
+    render(<Alert variant="error">Error message</Alert>)
+    expect(screen.getByRole('alert')).toBeInTheDocument()
+  })
+
+  it('uses role="alert" for warning variant', () => {
+    render(<Alert variant="warning">Warning message</Alert>)
+    expect(screen.getByRole('alert')).toBeInTheDocument()
+  })
+
+  it('uses role="status" for info variant', () => {
+    render(<Alert variant="info">Info message</Alert>)
+    expect(screen.getByRole('status')).toBeInTheDocument()
+  })
+
+  it('uses role="status" for success variant', () => {
+    render(<Alert variant="success">Success message</Alert>)
+    expect(screen.getByRole('status')).toBeInTheDocument()
+  })
+
+  it('defaults to info variant (role="status")', () => {
+    render(<Alert>Default alert</Alert>)
+    expect(screen.getByRole('status')).toBeInTheDocument()
+  })
+
+  it('shows default icon for each variant', () => {
+    const { rerender } = render(<Alert variant="info">msg</Alert>)
+    expect(screen.getByText('ℹ')).toBeInTheDocument()
+
+    rerender(<Alert variant="success">msg</Alert>)
+    expect(screen.getByText('✓')).toBeInTheDocument()
+
+    rerender(<Alert variant="warning">msg</Alert>)
+    expect(screen.getByText('⚠')).toBeInTheDocument()
+
+    rerender(<Alert variant="error">msg</Alert>)
+    expect(screen.getByText('✕')).toBeInTheDocument()
+  })
+
+  it('renders a custom icon when provided', () => {
+    render(<Alert icon={<span>★</span>}>Custom icon alert</Alert>)
+    expect(screen.getByText('★')).toBeInTheDocument()
+    // Default icon should not appear
+    expect(screen.queryByText('ℹ')).not.toBeInTheDocument()
+  })
+
+  it('does not show dismiss button when dismissible is false', () => {
+    render(<Alert>Non-dismissible</Alert>)
+    expect(screen.queryByRole('button', { name: /dismiss/i })).not.toBeInTheDocument()
+  })
+
+  it('shows dismiss button when dismissible is true', () => {
+    render(<Alert dismissible>Dismissible alert</Alert>)
+    expect(screen.getByRole('button', { name: /dismiss/i })).toBeInTheDocument()
+  })
+
+  it('calls onDismiss when dismiss button is clicked', async () => {
+    const onDismiss = vi.fn()
+    render(
+      <Alert dismissible onDismiss={onDismiss}>
+        Dismissible alert
+      </Alert>,
+    )
+    const user = userEvent.setup()
+    await user.click(screen.getByRole('button', { name: /dismiss/i }))
+    expect(onDismiss).toHaveBeenCalledTimes(1)
+  })
+
+  it('applies a custom className', () => {
+    const { container } = render(<Alert className="my-custom-class">Alert</Alert>)
+    expect(container.firstChild).toHaveClass('my-custom-class')
+  })
+
+  it('applies the correct variant class', () => {
+    const { container } = render(<Alert variant="error">Error</Alert>)
+    expect(container.firstChild).toHaveClass('error')
+  })
+})
diff --git a/src/design-system/primitives/Alert/Alert.tsx b/src/design-system/primitives/Alert/Alert.tsx
new file mode 100644
index 0000000..e6b637f
--- /dev/null
+++ b/src/design-system/primitives/Alert/Alert.tsx
@@ -0,0 +1,69 @@
+import { ReactNode } from 'react'
+import styles from './Alert.module.css'
+
+type AlertVariant = 'info' | 'success' | 'warning' | 'error'
+
+interface AlertProps {
+  variant?: AlertVariant
+  title?: string
+  children?: ReactNode
+  dismissible?: boolean
+  onDismiss?: () => void
+  icon?: ReactNode
+  className?: string
+}
+
+const DEFAULT_ICONS: Record<AlertVariant, string> = {
+  info: 'ℹ',
+  success: '✓',
+  warning: '⚠',
+  error: '✕',
+}
+
+const ARIA_ROLES: Record<AlertVariant, 'alert' | 'status'> = {
+  error: 'alert',
+  warning: 'alert',
+  info: 'status',
+  success: 'status',
+}
+
+export function Alert({
+  variant = 'info',
+  title,
+  children,
+  dismissible = false,
+  onDismiss,
+  icon,
+  className,
+}: AlertProps) {
+  const resolvedIcon = icon !== undefined ? icon : DEFAULT_ICONS[variant]
+  const role = ARIA_ROLES[variant]
+
+  const classes = [styles.alert, styles[variant], className ?? '']
+    .filter(Boolean)
+    .join(' ')
+
+  return (
+    <div className={classes} role={role}>
+      <span className={styles.icon} aria-hidden="true">
+        {resolvedIcon}
+      </span>
+
+      <div className={styles.content}>
+        {title && <div className={styles.title}>{title}</div>}
+        {children && <div className={styles.body}>{children}</div>}
+      </div>
+
+      {dismissible && (
+        <button
+          className={styles.dismissBtn}
+          onClick={onDismiss}
+          aria-label="Dismiss alert"
+          type="button"
+        >
+          &times;
+        </button>
+      )}
+    </div>
+  )
+}
diff --git a/src/design-system/primitives/FormField/FormField.module.css b/src/design-system/primitives/FormField/FormField.module.css
new file mode 100644
index 0000000..b0524e9
--- /dev/null
+++ b/src/design-system/primitives/FormField/FormField.module.css
@@ -0,0 +1,18 @@
+.wrapper {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  font-family: var(--font-body);
+}
+
+.hint {
+  font-size: 11px;
+  color: var(--text-muted);
+  margin-top: 4px;
+}
+
+.error {
+  font-size: 11px;
+  color: var(--error);
+  margin-top: 4px;
+}
diff --git a/src/design-system/primitives/FormField/FormField.test.tsx b/src/design-system/primitives/FormField/FormField.test.tsx
new file mode 100644
index 0000000..333b468
--- /dev/null
+++ b/src/design-system/primitives/FormField/FormField.test.tsx
@@ -0,0 +1,88 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import { FormField } from './FormField'
+
+describe('FormField', () => {
+  it('renders label and children', () => {
+    render(
+      <FormField label="Username" htmlFor="username">
+        <input id="username" type="text" />
+      </FormField>,
+    )
+    expect(screen.getByText('Username')).toBeInTheDocument()
+    expect(screen.getByRole('textbox')).toBeInTheDocument()
+  })
+
+  it('renders hint text when no error', () => {
+    render(
+      <FormField label="Email" hint="We will never share your email" htmlFor="email">
+        <input id="email" type="email" />
+      </FormField>,
+    )
+    expect(screen.getByText('We will never share your email')).toBeInTheDocument()
+  })
+
+  it('renders error instead of hint when error is provided', () => {
+    render(
+      <FormField
+        label="Email"
+        hint="We will never share your email"
+        error="Invalid email address"
+        htmlFor="email"
+      >
+        <input id="email" type="email" />
+      </FormField>,
+    )
+    expect(screen.getByText('Invalid email address')).toBeInTheDocument()
+    expect(screen.queryByText('We will never share your email')).not.toBeInTheDocument()
+  })
+
+  it('shows required asterisk via Label when required is true', () => {
+    render(
+      <FormField label="Password" required htmlFor="password">
+        <input id="password" type="password" />
+      </FormField>,
+    )
+    expect(screen.getByText('*')).toBeInTheDocument()
+  })
+
+  it('adds error class to wrapper when error is present', () => {
+    const { container } = render(
+      <FormField label="Name" error="Name is required" htmlFor="name">
+        <input id="name" type="text" />
+      </FormField>,
+    )
+    const wrapper = container.firstChild as HTMLElement
+    expect(wrapper.className).toMatch(/error/)
+  })
+
+  it('does not add error class when no error', () => {
+    const { container } = render(
+      <FormField label="Name" htmlFor="name">
+        <input id="name" type="text" />
+      </FormField>,
+    )
+    const wrapper = container.firstChild as HTMLElement
+    expect(wrapper.className).not.toMatch(/error/)
+  })
+
+  it('renders children without label when label prop is omitted', () => {
+    render(
+      <FormField>
+        <input type="text" aria-label="standalone input" />
+      </FormField>,
+    )
+    expect(screen.getByRole('textbox')).toBeInTheDocument()
+    expect(screen.queryByRole('label')).not.toBeInTheDocument()
+  })
+
+  it('associates label with input via htmlFor', () => {
+    render(
+      <FormField label="Search" htmlFor="search-input">
+        <input id="search-input" type="text" />
+      </FormField>,
+    )
+    const label = screen.getByText('Search').closest('label')
+    expect(label).toHaveAttribute('for', 'search-input')
+  })
+})
diff --git a/src/design-system/primitives/FormField/FormField.tsx b/src/design-system/primitives/FormField/FormField.tsx
new file mode 100644
index 0000000..84d3893
--- /dev/null
+++ b/src/design-system/primitives/FormField/FormField.tsx
@@ -0,0 +1,47 @@
+import type { ReactNode } from 'react'
+import { Label } from '../Label/Label'
+import styles from './FormField.module.css'
+
+interface FormFieldProps {
+  label?: string
+  htmlFor?: string
+  required?: boolean
+  error?: string
+  hint?: string
+  children: ReactNode
+  className?: string
+}
+
+export function FormField({
+  label,
+  htmlFor,
+  required,
+  error,
+  hint,
+  children,
+  className,
+}: FormFieldProps) {
+  const wrapperClass = [styles.wrapper, error ? styles.error : '', className ?? '']
+    .filter(Boolean)
+    .join(' ')
+
+  return (
+    <div className={wrapperClass}>
+      {label && (
+        <Label htmlFor={htmlFor} required={required}>
+          {label}
+        </Label>
+      )}
+      {children}
+      {error ? (
+        <span className={styles.error} role="alert">
+          {error}
+        </span>
+      ) : hint ? (
+        <span className={styles.hint}>{hint}</span>
+      ) : null}
+    </div>
+  )
+}
+
+FormField.displayName = 'FormField'
diff --git a/src/design-system/primitives/Label/Label.module.css b/src/design-system/primitives/Label/Label.module.css
new file mode 100644
index 0000000..b542bf7
--- /dev/null
+++ b/src/design-system/primitives/Label/Label.module.css
@@ -0,0 +1,11 @@
+.label {
+  font-family: var(--font-body);
+  font-size: 12px;
+  color: var(--text-primary);
+  font-weight: 500;
+}
+
+.asterisk {
+  color: var(--error);
+  margin-left: 2px;
+}
diff --git a/src/design-system/primitives/Label/Label.test.tsx b/src/design-system/primitives/Label/Label.test.tsx
new file mode 100644
index 0000000..afa2fb0
--- /dev/null
+++ b/src/design-system/primitives/Label/Label.test.tsx
@@ -0,0 +1,34 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import { Label } from './Label'
+
+describe('Label', () => {
+  it('renders label text', () => {
+    render(<Label>Email address</Label>)
+    expect(screen.getByText('Email address')).toBeInTheDocument()
+  })
+
+  it('does not show asterisk when required is not set', () => {
+    render(<Label>Username</Label>)
+    expect(screen.queryByText('*')).not.toBeInTheDocument()
+  })
+
+  it('shows asterisk when required', () => {
+    render(<Label required>Password</Label>)
+    expect(screen.getByText('*')).toBeInTheDocument()
+  })
+
+  it('passes htmlFor to the label element', () => {
+    render(<Label htmlFor="email-input">Email</Label>)
+    const label = screen.getByText('Email')
+    expect(label).toHaveAttribute('for', 'email-input')
+  })
+
+  it('forwards ref to the label element', () => {
+    let ref: HTMLLabelElement | null = null
+    render(
+      <Label ref={(el) => { ref = el }}>Ref test</Label>
+    )
+    expect(ref).toBeInstanceOf(HTMLLabelElement)
+  })
+})
diff --git a/src/design-system/primitives/Label/Label.tsx b/src/design-system/primitives/Label/Label.tsx
new file mode 100644
index 0000000..d343c3f
--- /dev/null
+++ b/src/design-system/primitives/Label/Label.tsx
@@ -0,0 +1,20 @@
+import styles from './Label.module.css'
+import { forwardRef, type LabelHTMLAttributes, type ReactNode } from 'react'
+
+interface LabelProps extends LabelHTMLAttributes<HTMLLabelElement> {
+  required?: boolean
+  children?: ReactNode
+  className?: string
+}
+
+export const Label = forwardRef<HTMLLabelElement, LabelProps>(
+  ({ required, children, className, ...rest }, ref) => {
+    return (
+      <label ref={ref} className={`${styles.label} ${className ?? ''}`} {...rest}>
+        {children}
+        {required && <span className={styles.asterisk}>*</span>}
+      </label>
+    )
+  },
+)
+Label.displayName = 'Label'
diff --git a/src/design-system/primitives/Pagination/Pagination.module.css b/src/design-system/primitives/Pagination/Pagination.module.css
new file mode 100644
index 0000000..4b19ba5
--- /dev/null
+++ b/src/design-system/primitives/Pagination/Pagination.module.css
@@ -0,0 +1,79 @@
+.pagination {
+  display: inline-flex;
+  align-items: center;
+  gap: 2px;
+}
+
+/* Prev / Next nav buttons — ghost style */
+.navBtn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  background: none;
+  border: none;
+  border-radius: var(--radius-sm);
+  color: var(--text-secondary);
+  font-family: var(--font-mono);
+  font-size: 12px;
+  cursor: pointer;
+  transition: all 0.15s;
+}
+
+.navBtn:hover:not(:disabled) {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+.navBtn:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+}
+
+/* Individual page number buttons */
+.pageBtn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  background: none;
+  border: none;
+  border-radius: var(--radius-sm);
+  color: var(--text-secondary);
+  font-family: var(--font-mono);
+  font-size: 12px;
+  cursor: pointer;
+  transition: all 0.15s;
+}
+
+.pageBtn:hover:not(:disabled) {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+.pageBtn:disabled:not(.active) {
+  opacity: 0.4;
+  cursor: not-allowed;
+}
+
+/* Active page */
+.active {
+  background: var(--amber);
+  color: white;
+  cursor: default;
+}
+
+/* Ellipsis */
+.ellipsis {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  color: var(--text-muted);
+  font-family: var(--font-mono);
+  font-size: 12px;
+  user-select: none;
+}
diff --git a/src/design-system/primitives/Pagination/Pagination.test.tsx b/src/design-system/primitives/Pagination/Pagination.test.tsx
new file mode 100644
index 0000000..826c206
--- /dev/null
+++ b/src/design-system/primitives/Pagination/Pagination.test.tsx
@@ -0,0 +1,141 @@
+import { describe, it, expect, vi } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { Pagination, getPageRange } from './Pagination'
+
+describe('getPageRange', () => {
+  it('returns all pages when totalPages is small', () => {
+    expect(getPageRange(1, 5, 1)).toEqual([1, 2, 3, 4, 5])
+  })
+
+  it('returns only page 1 when totalPages is 1', () => {
+    expect(getPageRange(1, 1, 1)).toEqual([1])
+  })
+
+  it('adds left ellipsis when current page is far from start', () => {
+    const range = getPageRange(10, 20, 1)
+    expect(range[0]).toBe(1)
+    expect(range[1]).toBe('ellipsis')
+  })
+
+  it('adds right ellipsis when current page is far from end', () => {
+    const range = getPageRange(1, 20, 1)
+    const lastEllipsisIdx = range.lastIndexOf('ellipsis')
+    expect(lastEllipsisIdx).toBeGreaterThan(-1)
+    expect(range[range.length - 1]).toBe(20)
+  })
+
+  it('shows first and last page always', () => {
+    const range = getPageRange(5, 20, 1)
+    expect(range[0]).toBe(1)
+    expect(range[range.length - 1]).toBe(20)
+  })
+
+  it('renders pages around current with siblingCount=1', () => {
+    // page 5, totalPages 20, siblingCount 1 → 1 ... 4 5 6 ... 20
+    const range = getPageRange(5, 20, 1)
+    expect(range).toContain(4)
+    expect(range).toContain(5)
+    expect(range).toContain(6)
+  })
+
+  it('renders wider sibling window with siblingCount=2', () => {
+    // page 10, totalPages 20, siblingCount 2 → 1 ... 8 9 10 11 12 ... 20
+    const range = getPageRange(10, 20, 2)
+    expect(range).toContain(8)
+    expect(range).toContain(9)
+    expect(range).toContain(10)
+    expect(range).toContain(11)
+    expect(range).toContain(12)
+  })
+
+  it('does not duplicate page 1 when siblings reach the start', () => {
+    const range = getPageRange(2, 20, 1)
+    const ones = range.filter(x => x === 1)
+    expect(ones).toHaveLength(1)
+  })
+
+  it('does not duplicate last page when siblings reach the end', () => {
+    const range = getPageRange(19, 20, 1)
+    const twenties = range.filter(x => x === 20)
+    expect(twenties).toHaveLength(1)
+  })
+})
+
+describe('Pagination', () => {
+  it('renders prev and next buttons', () => {
+    render(<Pagination page={5} totalPages={20} onPageChange={vi.fn()} />)
+    expect(screen.getByRole('button', { name: 'Previous page' })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: 'Next page' })).toBeInTheDocument()
+  })
+
+  it('marks the current page with aria-current', () => {
+    render(<Pagination page={5} totalPages={20} onPageChange={vi.fn()} />)
+    const activeBtn = screen.getByRole('button', { name: 'Page 5' })
+    expect(activeBtn).toHaveAttribute('aria-current', 'page')
+  })
+
+  it('shows ellipsis when pages are far apart', () => {
+    render(<Pagination page={10} totalPages={20} onPageChange={vi.fn()} />)
+    const ellipses = screen.getAllByText('…')
+    expect(ellipses.length).toBeGreaterThanOrEqual(1)
+  })
+
+  it('disables prev button on first page', () => {
+    render(<Pagination page={1} totalPages={10} onPageChange={vi.fn()} />)
+    expect(screen.getByRole('button', { name: 'Previous page' })).toBeDisabled()
+  })
+
+  it('does not disable next button on first page', () => {
+    render(<Pagination page={1} totalPages={10} onPageChange={vi.fn()} />)
+    expect(screen.getByRole('button', { name: 'Next page' })).not.toBeDisabled()
+  })
+
+  it('disables next button on last page', () => {
+    render(<Pagination page={10} totalPages={10} onPageChange={vi.fn()} />)
+    expect(screen.getByRole('button', { name: 'Next page' })).toBeDisabled()
+  })
+
+  it('does not disable prev button on last page', () => {
+    render(<Pagination page={10} totalPages={10} onPageChange={vi.fn()} />)
+    expect(screen.getByRole('button', { name: 'Previous page' })).not.toBeDisabled()
+  })
+
+  it('fires onPageChange with page - 1 when prev is clicked', async () => {
+    const user = userEvent.setup()
+    const onPageChange = vi.fn()
+    render(<Pagination page={5} totalPages={20} onPageChange={onPageChange} />)
+    await user.click(screen.getByRole('button', { name: 'Previous page' }))
+    expect(onPageChange).toHaveBeenCalledWith(4)
+  })
+
+  it('fires onPageChange with page + 1 when next is clicked', async () => {
+    const user = userEvent.setup()
+    const onPageChange = vi.fn()
+    render(<Pagination page={5} totalPages={20} onPageChange={onPageChange} />)
+    await user.click(screen.getByRole('button', { name: 'Next page' }))
+    expect(onPageChange).toHaveBeenCalledWith(6)
+  })
+
+  it('fires onPageChange with the clicked page number', async () => {
+    const user = userEvent.setup()
+    const onPageChange = vi.fn()
+    render(<Pagination page={5} totalPages={20} onPageChange={onPageChange} />)
+    await user.click(screen.getByRole('button', { name: 'Page 6' }))
+    expect(onPageChange).toHaveBeenCalledWith(6)
+  })
+
+  it('applies custom className', () => {
+    const { container } = render(
+      <Pagination page={1} totalPages={5} onPageChange={vi.fn()} className="custom-class" />
+    )
+    expect(container.firstChild).toHaveClass('custom-class')
+  })
+
+  it('renders with siblingCount=0 showing only current page between first and last', () => {
+    render(<Pagination page={10} totalPages={20} onPageChange={vi.fn()} siblingCount={0} />)
+    expect(screen.getByRole('button', { name: 'Page 10' })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: 'Page 1' })).toBeInTheDocument()
+    expect(screen.getByRole('button', { name: 'Page 20' })).toBeInTheDocument()
+  })
+})
diff --git a/src/design-system/primitives/Pagination/Pagination.tsx b/src/design-system/primitives/Pagination/Pagination.tsx
new file mode 100644
index 0000000..9bcf75a
--- /dev/null
+++ b/src/design-system/primitives/Pagination/Pagination.tsx
@@ -0,0 +1,113 @@
+import styles from './Pagination.module.css'
+import type { HTMLAttributes } from 'react'
+
+interface PaginationProps extends HTMLAttributes<HTMLElement> {
+  page: number
+  totalPages: number
+  onPageChange: (page: number) => void
+  siblingCount?: number
+  className?: string
+}
+
+export function getPageRange(
+  page: number,
+  totalPages: number,
+  siblingCount: number
+): (number | 'ellipsis')[] {
+  if (totalPages <= 1) return [1]
+
+  // If total pages fit in a compact window, just return all pages with no ellipsis
+  const totalPageNumbers = siblingCount * 2 + 5 // 1(first) + 1(last) + 1(current) + 2*siblings + 2(ellipsis slots)
+  if (totalPages <= totalPageNumbers) {
+    return Array.from({ length: totalPages }, (_, i) => i + 1)
+  }
+
+  const range: (number | 'ellipsis')[] = []
+
+  const left = Math.max(2, page - siblingCount)
+  const right = Math.min(totalPages - 1, page + siblingCount)
+
+  // First page always shown
+  range.push(1)
+
+  // Left ellipsis: gap between 1 and left boundary hides at least 1 page
+  if (left > 2) {
+    range.push('ellipsis')
+  }
+
+  // Middle pages
+  for (let i = left; i <= right; i++) {
+    range.push(i)
+  }
+
+  // Right ellipsis: gap between right boundary and last page hides at least 1 page
+  if (right < totalPages - 1) {
+    range.push('ellipsis')
+  }
+
+  // Last page always shown
+  range.push(totalPages)
+
+  return range
+}
+
+export function Pagination({
+  page,
+  totalPages,
+  onPageChange,
+  siblingCount = 1,
+  className,
+  ...rest
+}: PaginationProps) {
+  const pageRange = getPageRange(page, totalPages, siblingCount)
+
+  return (
+    <nav
+      aria-label="Pagination"
+      className={`${styles.pagination} ${className ?? ''}`}
+      {...rest}
+    >
+      <button
+        className={styles.navBtn}
+        onClick={() => onPageChange(page - 1)}
+        disabled={page <= 1}
+        aria-label="Previous page"
+      >
+        &lt;
+      </button>
+
+      {pageRange.map((item, idx) => {
+        if (item === 'ellipsis') {
+          return (
+            <span key={`ellipsis-${idx}`} className={styles.ellipsis} aria-hidden="true">
+              &hellip;
+            </span>
+          )
+        }
+
+        const isActive = item === page
+        return (
+          <button
+            key={item}
+            className={`${styles.pageBtn} ${isActive ? styles.active : ''}`}
+            onClick={() => onPageChange(item)}
+            aria-current={isActive ? 'page' : undefined}
+            aria-label={`Page ${item}`}
+            disabled={isActive}
+          >
+            {item}
+          </button>
+        )
+      })}
+
+      <button
+        className={styles.navBtn}
+        onClick={() => onPageChange(page + 1)}
+        disabled={page >= totalPages}
+        aria-label="Next page"
+      >
+        &gt;
+      </button>
+    </nav>
+  )
+}
diff --git a/src/design-system/primitives/ProgressBar/ProgressBar.module.css b/src/design-system/primitives/ProgressBar/ProgressBar.module.css
new file mode 100644
index 0000000..31b5c24
--- /dev/null
+++ b/src/design-system/primitives/ProgressBar/ProgressBar.module.css
@@ -0,0 +1,47 @@
+.wrapper {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  width: 100%;
+}
+
+.label {
+  font-family: var(--font-body);
+  font-size: 11px;
+  color: var(--text-secondary);
+  line-height: 1;
+}
+
+.track {
+  width: 100%;
+  background: var(--bg-inset);
+  border-radius: 4px;
+  overflow: hidden;
+}
+
+.sm { height: 4px; }
+.md { height: 8px; }
+
+.fill {
+  height: 100%;
+  border-radius: 4px;
+  transition: width 0.3s ease;
+}
+
+.primary  { background: var(--amber); }
+.success  { background: var(--success); }
+.warning  { background: var(--warning); }
+.error    { background: var(--error); }
+.running  { background: var(--running); }
+
+/* Indeterminate shimmer */
+@keyframes shimmer {
+  0%   { transform: translateX(-100%); width: 40%; }
+  50%  { transform: translateX(75%); width: 60%; }
+  100% { transform: translateX(250%); width: 40%; }
+}
+
+.indeterminate {
+  width: 40% !important;
+  animation: shimmer 1.4s ease-in-out infinite;
+}
diff --git a/src/design-system/primitives/ProgressBar/ProgressBar.test.tsx b/src/design-system/primitives/ProgressBar/ProgressBar.test.tsx
new file mode 100644
index 0000000..c701d00
--- /dev/null
+++ b/src/design-system/primitives/ProgressBar/ProgressBar.test.tsx
@@ -0,0 +1,100 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import { ProgressBar } from './ProgressBar'
+
+describe('ProgressBar', () => {
+  it('renders with default props', () => {
+    render(<ProgressBar />)
+    const bar = screen.getByRole('progressbar')
+    expect(bar).toBeInTheDocument()
+  })
+
+  it('sets aria-valuenow to the clamped value', () => {
+    render(<ProgressBar value={42} />)
+    const bar = screen.getByRole('progressbar')
+    expect(bar).toHaveAttribute('aria-valuenow', '42')
+  })
+
+  it('always sets aria-valuemin=0 and aria-valuemax=100', () => {
+    render(<ProgressBar value={50} />)
+    const bar = screen.getByRole('progressbar')
+    expect(bar).toHaveAttribute('aria-valuemin', '0')
+    expect(bar).toHaveAttribute('aria-valuemax', '100')
+  })
+
+  it('clamps value above 100 to 100', () => {
+    render(<ProgressBar value={150} />)
+    const bar = screen.getByRole('progressbar')
+    expect(bar).toHaveAttribute('aria-valuenow', '100')
+  })
+
+  it('clamps value below 0 to 0', () => {
+    render(<ProgressBar value={-10} />)
+    const bar = screen.getByRole('progressbar')
+    expect(bar).toHaveAttribute('aria-valuenow', '0')
+  })
+
+  it('omits aria-valuenow when indeterminate', () => {
+    render(<ProgressBar indeterminate />)
+    const bar = screen.getByRole('progressbar')
+    expect(bar).not.toHaveAttribute('aria-valuenow')
+  })
+
+  it('renders label text above the bar', () => {
+    render(<ProgressBar label="Upload progress" value={60} />)
+    expect(screen.getByText('Upload progress')).toBeInTheDocument()
+  })
+
+  it('does not render label element when label is omitted', () => {
+    render(<ProgressBar value={60} />)
+    expect(screen.queryByText('Upload progress')).not.toBeInTheDocument()
+  })
+
+  it('applies variant class to fill', () => {
+    const { container } = render(<ProgressBar variant="success" value={50} />)
+    const fill = container.querySelector('.fill')
+    expect(fill).toHaveClass('success')
+  })
+
+  it('applies error variant class to fill', () => {
+    const { container } = render(<ProgressBar variant="error" value={50} />)
+    const fill = container.querySelector('.fill')
+    expect(fill).toHaveClass('error')
+  })
+
+  it('applies sm size class to track', () => {
+    render(<ProgressBar size="sm" value={50} />)
+    const track = screen.getByRole('progressbar')
+    expect(track).toHaveClass('sm')
+  })
+
+  it('applies md size class to track by default', () => {
+    render(<ProgressBar value={50} />)
+    const track = screen.getByRole('progressbar')
+    expect(track).toHaveClass('md')
+  })
+
+  it('applies indeterminate class to fill when indeterminate', () => {
+    const { container } = render(<ProgressBar indeterminate />)
+    const fill = container.querySelector('.fill')
+    expect(fill).toHaveClass('indeterminate')
+  })
+
+  it('sets fill width style matching value', () => {
+    const { container } = render(<ProgressBar value={75} />)
+    const fill = container.querySelector('.fill') as HTMLElement
+    expect(fill.style.width).toBe('75%')
+  })
+
+  it('does not set width style when indeterminate', () => {
+    const { container } = render(<ProgressBar indeterminate />)
+    const fill = container.querySelector('.fill') as HTMLElement
+    expect(fill.style.width).toBe('')
+  })
+
+  it('passes through className to the track', () => {
+    render(<ProgressBar className="custom-class" value={30} />)
+    const bar = screen.getByRole('progressbar')
+    expect(bar).toHaveClass('custom-class')
+  })
+})
diff --git a/src/design-system/primitives/ProgressBar/ProgressBar.tsx b/src/design-system/primitives/ProgressBar/ProgressBar.tsx
new file mode 100644
index 0000000..c2a6e9f
--- /dev/null
+++ b/src/design-system/primitives/ProgressBar/ProgressBar.tsx
@@ -0,0 +1,60 @@
+import styles from './ProgressBar.module.css'
+
+type ProgressBarVariant = 'primary' | 'success' | 'warning' | 'error' | 'running'
+type ProgressBarSize = 'sm' | 'md'
+
+interface ProgressBarProps {
+  value?: number
+  variant?: ProgressBarVariant
+  size?: ProgressBarSize
+  indeterminate?: boolean
+  label?: string
+  className?: string
+}
+
+export function ProgressBar({
+  value = 0,
+  variant = 'primary',
+  size = 'md',
+  indeterminate = false,
+  label,
+  className,
+}: ProgressBarProps) {
+  const clampedValue = Math.min(100, Math.max(0, value))
+
+  const trackClasses = [
+    styles.track,
+    styles[size],
+    className ?? '',
+  ].filter(Boolean).join(' ')
+
+  const fillClasses = [
+    styles.fill,
+    styles[variant],
+    indeterminate ? styles.indeterminate : '',
+  ].filter(Boolean).join(' ')
+
+  const ariaProps = indeterminate
+    ? { 'aria-valuenow': undefined }
+    : { 'aria-valuenow': clampedValue }
+
+  return (
+    <div className={styles.wrapper}>
+      {label && (
+        <span className={styles.label}>{label}</span>
+      )}
+      <div
+        className={trackClasses}
+        role="progressbar"
+        aria-valuemin={0}
+        aria-valuemax={100}
+        {...ariaProps}
+      >
+        <div
+          className={fillClasses}
+          style={indeterminate ? undefined : { width: `${clampedValue}%` }}
+        />
+      </div>
+    </div>
+  )
+}
diff --git a/src/design-system/primitives/Radio/Radio.module.css b/src/design-system/primitives/Radio/Radio.module.css
new file mode 100644
index 0000000..6be91aa
--- /dev/null
+++ b/src/design-system/primitives/Radio/Radio.module.css
@@ -0,0 +1,92 @@
+/* ── RadioGroup layout ────────────────────────────────────────────────────── */
+
+.group {
+  display: flex;
+}
+
+.vertical {
+  flex-direction: column;
+  gap: 8px;
+}
+
+.horizontal {
+  flex-direction: row;
+  gap: 16px;
+}
+
+/* ── RadioItem wrapper ────────────────────────────────────────────────────── */
+
+.wrapper {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  cursor: pointer;
+  user-select: none;
+}
+
+.wrapperDisabled {
+  cursor: not-allowed;
+  opacity: 0.6;
+}
+
+/* ── Hidden native input ──────────────────────────────────────────────────── */
+
+.input {
+  position: absolute;
+  opacity: 0;
+  width: 0;
+  height: 0;
+  margin: 0;
+}
+
+/* ── Custom circle ────────────────────────────────────────────────────────── */
+
+.circle {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 15px;
+  height: 15px;
+  border: 1px solid var(--border);
+  border-radius: 50%;
+  background: var(--bg-raised);
+  flex-shrink: 0;
+  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
+}
+
+/* Inner dot when checked */
+.circle::after {
+  content: '';
+  display: none;
+  width: 7px;
+  height: 7px;
+  border-radius: 50%;
+  background: var(--amber);
+}
+
+.input:checked + .circle {
+  border-color: var(--amber);
+  background: var(--bg-raised);
+}
+
+.input:checked + .circle::after {
+  display: block;
+}
+
+.input:focus-visible + .circle {
+  border-color: var(--amber);
+  box-shadow: 0 0 0 3px var(--amber-bg);
+}
+
+.input:disabled + .circle {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+/* ── Label ────────────────────────────────────────────────────────────────── */
+
+.label {
+  font-family: var(--font-body);
+  font-size: 12px;
+  color: var(--text-primary);
+}
diff --git a/src/design-system/primitives/Radio/Radio.test.tsx b/src/design-system/primitives/Radio/Radio.test.tsx
new file mode 100644
index 0000000..2abd697
--- /dev/null
+++ b/src/design-system/primitives/Radio/Radio.test.tsx
@@ -0,0 +1,136 @@
+import { describe, it, expect, vi } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { RadioGroup, RadioItem } from './Radio'
+
+describe('RadioGroup + RadioItem', () => {
+  it('renders all options with correct labels', () => {
+    render(
+      <RadioGroup name="color" value="red" onChange={vi.fn()}>
+        <RadioItem value="red" label="Red" />
+        <RadioItem value="blue" label="Blue" />
+        <RadioItem value="green" label="Green" />
+      </RadioGroup>,
+    )
+    expect(screen.getByLabelText('Red')).toBeInTheDocument()
+    expect(screen.getByLabelText('Blue')).toBeInTheDocument()
+    expect(screen.getByLabelText('Green')).toBeInTheDocument()
+  })
+
+  it('marks the current value as checked', () => {
+    render(
+      <RadioGroup name="color" value="blue" onChange={vi.fn()}>
+        <RadioItem value="red" label="Red" />
+        <RadioItem value="blue" label="Blue" />
+      </RadioGroup>,
+    )
+    expect(screen.getByLabelText('Red')).not.toBeChecked()
+    expect(screen.getByLabelText('Blue')).toBeChecked()
+  })
+
+  it('calls onChange with the selected value when clicking an option', async () => {
+    const onChange = vi.fn()
+    const user = userEvent.setup()
+    render(
+      <RadioGroup name="color" value="red" onChange={onChange}>
+        <RadioItem value="red" label="Red" />
+        <RadioItem value="blue" label="Blue" />
+      </RadioGroup>,
+    )
+    await user.click(screen.getByLabelText('Blue'))
+    expect(onChange).toHaveBeenCalledWith('blue')
+  })
+
+  it('does not call onChange when clicking a disabled item', async () => {
+    const onChange = vi.fn()
+    const user = userEvent.setup()
+    render(
+      <RadioGroup name="color" value="red" onChange={onChange}>
+        <RadioItem value="red" label="Red" />
+        <RadioItem value="blue" label="Blue" disabled />
+      </RadioGroup>,
+    )
+    await user.click(screen.getByLabelText('Blue'))
+    expect(onChange).not.toHaveBeenCalled()
+  })
+
+  it('disabled item has disabled attribute', () => {
+    render(
+      <RadioGroup name="color" value="red" onChange={vi.fn()}>
+        <RadioItem value="red" label="Red" />
+        <RadioItem value="blue" label="Blue" disabled />
+      </RadioGroup>,
+    )
+    expect(screen.getByLabelText('Blue')).toBeDisabled()
+    expect(screen.getByLabelText('Red')).not.toBeDisabled()
+  })
+
+  it('all inputs share the same name', () => {
+    render(
+      <RadioGroup name="size" value="md" onChange={vi.fn()}>
+        <RadioItem value="sm" label="Small" />
+        <RadioItem value="md" label="Medium" />
+        <RadioItem value="lg" label="Large" />
+      </RadioGroup>,
+    )
+    const inputs = screen.getAllByRole('radio')
+    inputs.forEach((input) => {
+      expect(input).toHaveAttribute('name', 'size')
+    })
+  })
+
+  it('supports keyboard navigation between items', async () => {
+    const onChange = vi.fn()
+    const user = userEvent.setup()
+    render(
+      <RadioGroup name="color" value="red" onChange={onChange}>
+        <RadioItem value="red" label="Red" />
+        <RadioItem value="blue" label="Blue" />
+      </RadioGroup>,
+    )
+    const redInput = screen.getByLabelText('Red')
+    redInput.focus()
+    await user.keyboard('{ArrowDown}')
+    expect(onChange).toHaveBeenCalledWith('blue')
+  })
+
+  it('applies horizontal layout class when orientation is horizontal', () => {
+    const { container } = render(
+      <RadioGroup name="color" value="red" onChange={vi.fn()} orientation="horizontal">
+        <RadioItem value="red" label="Red" />
+        <RadioItem value="blue" label="Blue" />
+      </RadioGroup>,
+    )
+    const group = container.firstChild as HTMLElement
+    expect(group.className).toMatch(/horizontal/)
+  })
+
+  it('applies vertical layout class by default', () => {
+    const { container } = render(
+      <RadioGroup name="color" value="red" onChange={vi.fn()}>
+        <RadioItem value="red" label="Red" />
+      </RadioGroup>,
+    )
+    const group = container.firstChild as HTMLElement
+    expect(group.className).toMatch(/vertical/)
+  })
+
+  it('accepts a ReactNode as label', () => {
+    render(
+      <RadioGroup name="color" value="red" onChange={vi.fn()}>
+        <RadioItem value="red" label={<strong>Bold Red</strong>} />
+      </RadioGroup>,
+    )
+    expect(screen.getByText('Bold Red')).toBeInTheDocument()
+  })
+
+  it('applies custom className to RadioGroup', () => {
+    const { container } = render(
+      <RadioGroup name="color" value="red" onChange={vi.fn()} className="custom-class">
+        <RadioItem value="red" label="Red" />
+      </RadioGroup>,
+    )
+    const group = container.firstChild as HTMLElement
+    expect(group.className).toContain('custom-class')
+  })
+})
diff --git a/src/design-system/primitives/Radio/Radio.tsx b/src/design-system/primitives/Radio/Radio.tsx
new file mode 100644
index 0000000..ab53f93
--- /dev/null
+++ b/src/design-system/primitives/Radio/Radio.tsx
@@ -0,0 +1,128 @@
+import styles from './Radio.module.css'
+import { createContext, useContext, type ReactNode } from 'react'
+
+interface RadioGroupContextValue {
+  name: string
+  value: string
+  onChange: (value: string) => void
+}
+
+const RadioGroupContext = createContext<RadioGroupContextValue | null>(null)
+
+function useRadioGroup(): RadioGroupContextValue {
+  const ctx = useContext(RadioGroupContext)
+  if (!ctx) {
+    throw new Error('RadioItem must be used inside a RadioGroup')
+  }
+  return ctx
+}
+
+// ── RadioGroup ────────────────────────────────────────────────────────────────
+
+interface RadioGroupProps {
+  name: string
+  value: string
+  onChange: (value: string) => void
+  orientation?: 'vertical' | 'horizontal'
+  children?: ReactNode
+  className?: string
+}
+
+export function RadioGroup({
+  name,
+  value,
+  onChange,
+  orientation = 'vertical',
+  children,
+  className,
+}: RadioGroupProps) {
+  return (
+    <RadioGroupContext.Provider value={{ name, value, onChange }}>
+      <div
+        role="radiogroup"
+        className={`${styles.group} ${styles[orientation]} ${className ?? ''}`}
+      >
+        {children}
+      </div>
+    </RadioGroupContext.Provider>
+  )
+}
+
+// ── RadioItem ─────────────────────────────────────────────────────────────────
+
+interface RadioItemProps {
+  value: string
+  label: ReactNode
+  disabled?: boolean
+}
+
+export function RadioItem({ value, label, disabled = false }: RadioItemProps) {
+  const ctx = useRadioGroup()
+  const inputId = `radio-${ctx.name}-${value}`
+  const isChecked = ctx.value === value
+
+  function handleChange() {
+    if (!disabled) {
+      ctx.onChange(value)
+    }
+  }
+
+  function handleKeyDown(e: React.KeyboardEvent<HTMLInputElement>) {
+    // Native radio keyboard behaviour fires onChange on ArrowDown/Up/Left/Right
+    // but since we control the value externally we need to relay those events.
+    if (e.key === 'ArrowDown' || e.key === 'ArrowRight') {
+      e.preventDefault()
+      const inputs = getGroupInputs(e.currentTarget)
+      const next = getNextEnabled(inputs, e.currentTarget, 1)
+      if (next) {
+        ctx.onChange(next.value)
+        next.focus()
+      }
+    } else if (e.key === 'ArrowUp' || e.key === 'ArrowLeft') {
+      e.preventDefault()
+      const inputs = getGroupInputs(e.currentTarget)
+      const prev = getNextEnabled(inputs, e.currentTarget, -1)
+      if (prev) {
+        ctx.onChange(prev.value)
+        prev.focus()
+      }
+    }
+  }
+
+  return (
+    <label className={`${styles.wrapper} ${disabled ? styles.wrapperDisabled : ''}`} htmlFor={inputId}>
+      <input
+        id={inputId}
+        type="radio"
+        name={ctx.name}
+        value={value}
+        checked={isChecked}
+        disabled={disabled}
+        className={styles.input}
+        onChange={handleChange}
+        onKeyDown={handleKeyDown}
+      />
+      <span className={styles.circle} aria-hidden="true" />
+      {label && <span className={styles.label}>{label}</span>}
+    </label>
+  )
+}
+
+// ── helpers ───────────────────────────────────────────────────────────────────
+
+function getGroupInputs(current: HTMLInputElement): HTMLInputElement[] {
+  const group = current.closest('[role="radiogroup"]')
+  if (!group) return []
+  return Array.from(group.querySelectorAll<HTMLInputElement>('input[type="radio"]:not(:disabled)'))
+}
+
+function getNextEnabled(
+  inputs: HTMLInputElement[],
+  current: HTMLInputElement,
+  direction: 1 | -1,
+): HTMLInputElement | null {
+  const idx = inputs.indexOf(current)
+  if (idx === -1) return null
+  const next = (idx + direction + inputs.length) % inputs.length
+  return inputs[next] ?? null
+}
diff --git a/src/design-system/primitives/Skeleton/Skeleton.module.css b/src/design-system/primitives/Skeleton/Skeleton.module.css
new file mode 100644
index 0000000..d801a0c
--- /dev/null
+++ b/src/design-system/primitives/Skeleton/Skeleton.module.css
@@ -0,0 +1,48 @@
+@keyframes shimmer {
+  from {
+    background-position: -200% center;
+  }
+  to {
+    background-position: 200% center;
+  }
+}
+
+.skeleton {
+  background-color: var(--bg-inset);
+  display: block;
+}
+
+.shimmer {
+  background-image: linear-gradient(
+    90deg,
+    var(--bg-inset) 25%,
+    color-mix(in srgb, var(--bg-inset) 60%, transparent) 50%,
+    var(--bg-inset) 75%
+  );
+  background-size: 200% 100%;
+  animation: shimmer 1.5s linear infinite;
+}
+
+.text {
+  height: 12px;
+  border-radius: 4px;
+  width: 100%;
+}
+
+.textGroup {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.circular {
+  border-radius: 50%;
+  width: 40px;
+  height: 40px;
+}
+
+.rectangular {
+  border-radius: var(--radius-sm);
+  width: 100%;
+  height: 80px;
+}
diff --git a/src/design-system/primitives/Skeleton/Skeleton.test.tsx b/src/design-system/primitives/Skeleton/Skeleton.test.tsx
new file mode 100644
index 0000000..bc5177d
--- /dev/null
+++ b/src/design-system/primitives/Skeleton/Skeleton.test.tsx
@@ -0,0 +1,82 @@
+import { describe, it, expect } from 'vitest'
+import { render } from '@testing-library/react'
+import { Skeleton } from './Skeleton'
+
+describe('Skeleton', () => {
+  it('renders rectangular variant by default', () => {
+    const { container } = render(<Skeleton />)
+    const el = container.firstChild as HTMLElement
+    expect(el).toHaveClass('rectangular')
+    expect(el).toHaveClass('shimmer')
+  })
+
+  it('renders text variant with single bar', () => {
+    const { container } = render(<Skeleton variant="text" />)
+    const el = container.firstChild as HTMLElement
+    expect(el).toHaveClass('text')
+    expect(el).toHaveClass('shimmer')
+  })
+
+  it('renders circular variant', () => {
+    const { container } = render(<Skeleton variant="circular" />)
+    const el = container.firstChild as HTMLElement
+    expect(el).toHaveClass('circular')
+    expect(el).toHaveClass('shimmer')
+  })
+
+  it('renders multiple lines for text variant when lines > 1', () => {
+    const { container } = render(<Skeleton variant="text" lines={3} />)
+    const group = container.firstChild as HTMLElement
+    expect(group).toHaveClass('textGroup')
+    const bars = group.querySelectorAll('.text')
+    expect(bars).toHaveLength(3)
+  })
+
+  it('renders last bar at 70% width when lines > 1', () => {
+    const { container } = render(<Skeleton variant="text" lines={3} />)
+    const group = container.firstChild as HTMLElement
+    const bars = group.querySelectorAll('.text')
+    const lastBar = bars[bars.length - 1] as HTMLElement
+    expect(lastBar.style.width).toBe('70%')
+  })
+
+  it('applies custom width and height', () => {
+    const { container } = render(<Skeleton variant="rectangular" width={200} height={50} />)
+    const el = container.firstChild as HTMLElement
+    expect(el.style.width).toBe('200px')
+    expect(el.style.height).toBe('50px')
+  })
+
+  it('applies custom width and height as strings', () => {
+    const { container } = render(<Skeleton variant="circular" width="80px" height="80px" />)
+    const el = container.firstChild as HTMLElement
+    expect(el.style.width).toBe('80px')
+    expect(el.style.height).toBe('80px')
+  })
+
+  it('applies extra className', () => {
+    const { container } = render(<Skeleton className="custom-class" />)
+    const el = container.firstChild as HTMLElement
+    expect(el).toHaveClass('custom-class')
+  })
+
+  it('circular has default 40x40 dimensions', () => {
+    const { container } = render(<Skeleton variant="circular" />)
+    const el = container.firstChild as HTMLElement
+    expect(el.style.width).toBe('40px')
+    expect(el.style.height).toBe('40px')
+  })
+
+  it('rectangular has default 80px height and 100% width', () => {
+    const { container } = render(<Skeleton variant="rectangular" />)
+    const el = container.firstChild as HTMLElement
+    expect(el.style.width).toBe('100%')
+    expect(el.style.height).toBe('80px')
+  })
+
+  it('is aria-hidden', () => {
+    const { container } = render(<Skeleton />)
+    const el = container.firstChild as HTMLElement
+    expect(el).toHaveAttribute('aria-hidden', 'true')
+  })
+})
diff --git a/src/design-system/primitives/Skeleton/Skeleton.tsx b/src/design-system/primitives/Skeleton/Skeleton.tsx
new file mode 100644
index 0000000..75e3532
--- /dev/null
+++ b/src/design-system/primitives/Skeleton/Skeleton.tsx
@@ -0,0 +1,71 @@
+import styles from './Skeleton.module.css'
+
+interface SkeletonProps {
+  variant?: 'text' | 'circular' | 'rectangular'
+  width?: string | number
+  height?: string | number
+  lines?: number
+  className?: string
+}
+
+function normalizeSize(value: string | number | undefined): string | undefined {
+  if (value === undefined) return undefined
+  return typeof value === 'number' ? `${value}px` : value
+}
+
+export function Skeleton({
+  variant = 'rectangular',
+  width,
+  height,
+  lines,
+  className,
+}: SkeletonProps) {
+  const w = normalizeSize(width)
+  const h = normalizeSize(height)
+
+  if (variant === 'text') {
+    const lineCount = lines && lines > 1 ? lines : 1
+    if (lineCount === 1) {
+      return (
+        <div
+          className={[styles.skeleton, styles.text, styles.shimmer, className ?? ''].filter(Boolean).join(' ')}
+          style={{ width: w, height: h }}
+          aria-hidden="true"
+        />
+      )
+    }
+    return (
+      <div className={[styles.textGroup, className ?? ''].filter(Boolean).join(' ')} aria-hidden="true">
+        {Array.from({ length: lineCount }, (_, i) => (
+          <div
+            key={i}
+            className={[styles.skeleton, styles.text, styles.shimmer].join(' ')}
+            style={{
+              width: i === lineCount - 1 ? '70%' : (w ?? '100%'),
+              height: h,
+            }}
+          />
+        ))}
+      </div>
+    )
+  }
+
+  if (variant === 'circular') {
+    return (
+      <div
+        className={[styles.skeleton, styles.circular, styles.shimmer, className ?? ''].filter(Boolean).join(' ')}
+        style={{ width: w ?? '40px', height: h ?? '40px' }}
+        aria-hidden="true"
+      />
+    )
+  }
+
+  // rectangular (default)
+  return (
+    <div
+      className={[styles.skeleton, styles.rectangular, styles.shimmer, className ?? ''].filter(Boolean).join(' ')}
+      style={{ width: w ?? '100%', height: h ?? '80px' }}
+      aria-hidden="true"
+    />
+  )
+}
diff --git a/src/design-system/primitives/Textarea/Textarea.module.css b/src/design-system/primitives/Textarea/Textarea.module.css
new file mode 100644
index 0000000..1c14d28
--- /dev/null
+++ b/src/design-system/primitives/Textarea/Textarea.module.css
@@ -0,0 +1,21 @@
+.textarea {
+  width: 100%;
+  padding: 6px 12px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg-raised);
+  color: var(--text-primary);
+  font-family: var(--font-body);
+  font-size: 12px;
+  outline: none;
+  transition: border-color 0.15s, box-shadow 0.15s;
+  resize: vertical;
+}
+
+.textarea::placeholder { color: var(--text-faint); }
+.textarea:focus { border-color: var(--amber); box-shadow: 0 0 0 3px var(--amber-bg); }
+
+.resizeVertical { resize: vertical; }
+.resizeHorizontal { resize: horizontal; }
+.resizeNone { resize: none; }
+.resizeBoth { resize: both; }
diff --git a/src/design-system/primitives/Textarea/Textarea.test.tsx b/src/design-system/primitives/Textarea/Textarea.test.tsx
new file mode 100644
index 0000000..09807bf
--- /dev/null
+++ b/src/design-system/primitives/Textarea/Textarea.test.tsx
@@ -0,0 +1,79 @@
+import { describe, it, expect, vi } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { createRef } from 'react'
+import { Textarea } from './Textarea'
+
+describe('Textarea', () => {
+  it('renders a textarea element', () => {
+    render(<Textarea placeholder="Enter text" />)
+    expect(screen.getByPlaceholderText('Enter text')).toBeInTheDocument()
+  })
+
+  it('renders with default rows of 3', () => {
+    render(<Textarea />)
+    const el = screen.getByRole('textbox')
+    expect(el).toHaveAttribute('rows', '3')
+  })
+
+  it('accepts a custom rows value', () => {
+    render(<Textarea rows={5} />)
+    expect(screen.getByRole('textbox')).toHaveAttribute('rows', '5')
+  })
+
+  it('accepts user input', async () => {
+    const user = userEvent.setup()
+    render(<Textarea />)
+    const el = screen.getByRole('textbox')
+    await user.type(el, 'hello world')
+    expect(el).toHaveValue('hello world')
+  })
+
+  it('calls onChange when value changes', async () => {
+    const onChange = vi.fn()
+    const user = userEvent.setup()
+    render(<Textarea onChange={onChange} />)
+    await user.type(screen.getByRole('textbox'), 'a')
+    expect(onChange).toHaveBeenCalled()
+  })
+
+  it('applies resize class for vertical (default)', () => {
+    render(<Textarea />)
+    const el = screen.getByRole('textbox')
+    expect(el.className).toContain('resizeVertical')
+  })
+
+  it('applies resize class for none', () => {
+    render(<Textarea resize="none" />)
+    const el = screen.getByRole('textbox')
+    expect(el.className).toContain('resizeNone')
+  })
+
+  it('applies resize class for horizontal', () => {
+    render(<Textarea resize="horizontal" />)
+    const el = screen.getByRole('textbox')
+    expect(el.className).toContain('resizeHorizontal')
+  })
+
+  it('applies resize class for both', () => {
+    render(<Textarea resize="both" />)
+    const el = screen.getByRole('textbox')
+    expect(el.className).toContain('resizeBoth')
+  })
+
+  it('forwards ref to the textarea element', () => {
+    const ref = createRef<HTMLTextAreaElement>()
+    render(<Textarea ref={ref} />)
+    expect(ref.current).toBeInstanceOf(HTMLTextAreaElement)
+  })
+
+  it('passes additional props to the textarea', () => {
+    render(<Textarea disabled data-testid="ta" />)
+    expect(screen.getByTestId('ta')).toBeDisabled()
+  })
+
+  it('applies custom className', () => {
+    render(<Textarea className="custom" />)
+    expect(screen.getByRole('textbox').className).toContain('custom')
+  })
+})
diff --git a/src/design-system/primitives/Textarea/Textarea.tsx b/src/design-system/primitives/Textarea/Textarea.tsx
new file mode 100644
index 0000000..2a8ca51
--- /dev/null
+++ b/src/design-system/primitives/Textarea/Textarea.tsx
@@ -0,0 +1,31 @@
+import styles from './Textarea.module.css'
+import { forwardRef, type TextareaHTMLAttributes } from 'react'
+
+type ResizeProp = 'vertical' | 'horizontal' | 'none' | 'both'
+
+interface TextareaProps extends TextareaHTMLAttributes<HTMLTextAreaElement> {
+  resize?: ResizeProp
+}
+
+const resizeClassMap: Record<ResizeProp, string> = {
+  vertical: styles.resizeVertical,
+  horizontal: styles.resizeHorizontal,
+  none: styles.resizeNone,
+  both: styles.resizeBoth,
+}
+
+export const Textarea = forwardRef<HTMLTextAreaElement, TextareaProps>(
+  ({ resize = 'vertical', className, rows = 3, ...rest }, ref) => {
+    const resizeClass = resizeClassMap[resize]
+    return (
+      <textarea
+        ref={ref}
+        rows={rows}
+        className={`${styles.textarea} ${resizeClass} ${className ?? ''}`}
+        {...rest}
+      />
+    )
+  },
+)
+
+Textarea.displayName = 'Textarea'
diff --git a/src/design-system/primitives/index.ts b/src/design-system/primitives/index.ts
index c20261a..d610f49 100644
--- a/src/design-system/primitives/index.ts
+++ b/src/design-system/primitives/index.ts
@@ -1,3 +1,4 @@
+export { Alert } from './Alert/Alert'
 export { Avatar } from './Avatar/Avatar'
 export { Badge } from './Badge/Badge'
 export { Button } from './Button/Button'
@@ -9,16 +10,23 @@ export { DateRangePicker } from './DateRangePicker/DateRangePicker'
 export { DateTimePicker } from './DateTimePicker/DateTimePicker'
 export { EmptyState } from './EmptyState/EmptyState'
 export { FilterPill } from './FilterPill/FilterPill'
+export { FormField } from './FormField/FormField'
 export { InfoCallout } from './InfoCallout/InfoCallout'
 export { Input } from './Input/Input'
 export { KeyboardHint } from './KeyboardHint/KeyboardHint'
+export { Label } from './Label/Label'
 export { MonoText } from './MonoText/MonoText'
+export { Pagination } from './Pagination/Pagination'
+export { ProgressBar } from './ProgressBar/ProgressBar'
+export { RadioGroup, RadioItem } from './Radio/Radio'
 export { SectionHeader } from './SectionHeader/SectionHeader'
 export { Select } from './Select/Select'
+export { Skeleton } from './Skeleton/Skeleton'
 export { Sparkline } from './Sparkline/Sparkline'
 export { Spinner } from './Spinner/Spinner'
 export { StatCard } from './StatCard/StatCard'
 export { StatusDot } from './StatusDot/StatusDot'
 export { Tag } from './Tag/Tag'
+export { Textarea } from './Textarea/Textarea'
 export { Toggle } from './Toggle/Toggle'
 export { Tooltip } from './Tooltip/Tooltip'
diff --git a/src/pages/Inventory/Inventory.module.css b/src/pages/Inventory/Inventory.module.css
new file mode 100644
index 0000000..fc58819
--- /dev/null
+++ b/src/pages/Inventory/Inventory.module.css
@@ -0,0 +1,87 @@
+.page {
+  min-height: 100vh;
+  background: var(--bg-body);
+  font-family: var(--font-body);
+}
+
+.header {
+  position: sticky;
+  top: 0;
+  z-index: 10;
+  background: var(--bg-surface);
+  border-bottom: 1px solid var(--border);
+  padding: 12px 24px;
+  display: flex;
+  align-items: center;
+  gap: 16px;
+}
+
+.headerTitle {
+  font-size: 18px;
+  font-weight: 600;
+  color: var(--text-primary);
+  margin: 0;
+}
+
+.backLink {
+  font-size: 13px;
+  color: var(--amber);
+  text-decoration: none;
+  margin-left: auto;
+}
+
+.backLink:hover {
+  text-decoration: underline;
+}
+
+.body {
+  display: flex;
+  gap: 0;
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 24px;
+}
+
+.nav {
+  width: 200px;
+  flex-shrink: 0;
+  position: sticky;
+  top: 57px;
+  height: calc(100vh - 57px);
+  overflow-y: auto;
+  padding-right: 16px;
+}
+
+.navSection {
+  margin-bottom: 8px;
+}
+
+.navLabel {
+  font-size: 11px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  color: var(--text-muted);
+  padding: 8px 8px 4px;
+  display: block;
+}
+
+.navLink {
+  display: block;
+  font-size: 13px;
+  color: var(--text-secondary);
+  text-decoration: none;
+  padding: 4px 8px;
+  border-radius: var(--radius-sm);
+  line-height: 1.5;
+}
+
+.navLink:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+.content {
+  flex: 1;
+  min-width: 0;
+}
diff --git a/src/pages/Inventory/Inventory.tsx b/src/pages/Inventory/Inventory.tsx
new file mode 100644
index 0000000..8aff9fe
--- /dev/null
+++ b/src/pages/Inventory/Inventory.tsx
@@ -0,0 +1,41 @@
+import { Link } from 'react-router-dom'
+import styles from './Inventory.module.css'
+import { PrimitivesSection } from './sections/PrimitivesSection'
+import { CompositesSection } from './sections/CompositesSection'
+import { LayoutSection } from './sections/LayoutSection'
+
+const NAV_ITEMS = [
+  { label: 'Primitives', href: '#primitives' },
+  { label: 'Composites', href: '#composites' },
+  { label: 'Layout', href: '#layout' },
+]
+
+export function Inventory() {
+  return (
+    <div className={styles.page}>
+      <header className={styles.header}>
+        <h1 className={styles.headerTitle}>Component Inventory</h1>
+        <Link to="/" className={styles.backLink}>← Back to app</Link>
+      </header>
+
+      <div className={styles.body}>
+        <nav className={styles.nav} aria-label="Component categories">
+          <div className={styles.navSection}>
+            <span className={styles.navLabel}>Categories</span>
+            {NAV_ITEMS.map((item) => (
+              <a key={item.href} href={item.href} className={styles.navLink}>
+                {item.label}
+              </a>
+            ))}
+          </div>
+        </nav>
+
+        <main className={styles.content}>
+          <PrimitivesSection />
+          <CompositesSection />
+          <LayoutSection />
+        </main>
+      </div>
+    </div>
+  )
+}
diff --git a/src/pages/Inventory/sections/CompositesSection.module.css b/src/pages/Inventory/sections/CompositesSection.module.css
new file mode 100644
index 0000000..24d9c69
--- /dev/null
+++ b/src/pages/Inventory/sections/CompositesSection.module.css
@@ -0,0 +1,74 @@
+.section {
+  margin-bottom: 40px;
+}
+
+.sectionTitle {
+  font-size: 22px;
+  font-weight: 700;
+  color: var(--text-primary);
+  margin: 0 0 24px;
+}
+
+.componentCard {
+  background: var(--bg-surface);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-md);
+  padding: 20px;
+  margin-bottom: 16px;
+  box-shadow: var(--shadow-sm);
+}
+
+.componentTitle {
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--text-primary);
+  margin: 0 0 4px;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.componentDesc {
+  font-size: 12px;
+  color: var(--text-muted);
+  margin: 0 0 16px;
+}
+
+.demoArea {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  align-items: flex-start;
+}
+
+.demoAreaColumn {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  align-items: flex-start;
+}
+
+.demoAreaRow {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  align-items: center;
+}
+
+.demoLabel {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-weight: 500;
+}
+
+.demoGroup {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.demoGroupRow {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
diff --git a/src/pages/Inventory/sections/CompositesSection.tsx b/src/pages/Inventory/sections/CompositesSection.tsx
new file mode 100644
index 0000000..f5a0cd9
--- /dev/null
+++ b/src/pages/Inventory/sections/CompositesSection.tsx
@@ -0,0 +1,598 @@
+import { useState } from 'react'
+import styles from './CompositesSection.module.css'
+import {
+  Accordion,
+  AlertDialog,
+  AreaChart,
+  AvatarGroup,
+  BarChart,
+  Breadcrumb,
+  CommandPalette,
+  DataTable,
+  DetailPanel,
+  Dropdown,
+  EventFeed,
+  FilterBar,
+  LineChart,
+  MenuItem,
+  Modal,
+  Popover,
+  ProcessorTimeline,
+  ShortcutsBar,
+  Tabs,
+  ToastProvider,
+  useToast,
+  TreeView,
+} from '../../../design-system/composites'
+import type { SearchResult } from '../../../design-system/composites'
+import { Button } from '../../../design-system/primitives'
+
+// ── DemoCard helper ──────────────────────────────────────────────────────────
+
+interface DemoCardProps {
+  id: string
+  title: string
+  description: string
+  children: React.ReactNode
+}
+
+function DemoCard({ id, title, description, children }: DemoCardProps) {
+  return (
+    <div id={id} className={styles.componentCard}>
+      <h3 className={styles.componentTitle}>{title}</h3>
+      <p className={styles.componentDesc}>{description}</p>
+      <div className={styles.demoArea}>{children}</div>
+    </div>
+  )
+}
+
+// ── Toast demo inner component (must be inside ToastProvider) ─────────────────
+
+function ToastDemo() {
+  const { toast } = useToast()
+  return (
+    <div className={styles.demoAreaRow}>
+      <Button size="sm" variant="primary" onClick={() => toast({ title: 'Success!', description: 'Operation completed.', variant: 'success' })}>
+        Success toast
+      </Button>
+      <Button size="sm" variant="secondary" onClick={() => toast({ title: 'Info', description: 'Something to note.', variant: 'info' })}>
+        Info toast
+      </Button>
+      <Button size="sm" variant="danger" onClick={() => toast({ title: 'Error', description: 'Something went wrong.', variant: 'error' })}>
+        Error toast
+      </Button>
+      <Button size="sm" variant="ghost" onClick={() => toast({ title: 'Warning', description: 'Proceed with caution.', variant: 'warning' })}>
+        Warning toast
+      </Button>
+    </div>
+  )
+}
+
+// ── Sample data ───────────────────────────────────────────────────────────────
+
+const CHART_SERIES = [
+  {
+    label: 'Requests',
+    data: [
+      { x: 0, y: 120 }, { x: 1, y: 180 }, { x: 2, y: 150 },
+      { x: 3, y: 210 }, { x: 4, y: 190 }, { x: 5, y: 240 },
+    ],
+  },
+  {
+    label: 'Errors',
+    data: [
+      { x: 0, y: 5 }, { x: 1, y: 12 }, { x: 2, y: 8 },
+      { x: 3, y: 15 }, { x: 4, y: 7 }, { x: 5, y: 10 },
+    ],
+    color: 'var(--error)',
+  },
+]
+
+const BAR_SERIES = [
+  {
+    label: 'GET',
+    data: [
+      { x: 'Mon', y: 80 }, { x: 'Tue', y: 95 }, { x: 'Wed', y: 110 },
+      { x: 'Thu', y: 72 }, { x: 'Fri', y: 130 },
+    ],
+  },
+  {
+    label: 'POST',
+    data: [
+      { x: 'Mon', y: 40 }, { x: 'Tue', y: 55 }, { x: 'Wed', y: 60 },
+      { x: 'Thu', y: 38 }, { x: 'Fri', y: 75 },
+    ],
+    color: 'var(--success)',
+  },
+]
+
+const COMMAND_PALETTE_DATA: SearchResult[] = [
+  { id: 'r1', category: 'route', title: 'order-ingest', meta: 'POST /orders/ingest' },
+  { id: 'r2', category: 'route', title: 'payment-validate', meta: 'POST /payments/validate' },
+  { id: 'e1', category: 'execution', title: 'exec-001', meta: 'Started 2m ago' },
+  { id: 'e2', category: 'execution', title: 'exec-002', meta: 'Completed 5m ago' },
+  { id: 'a1', category: 'agent', title: 'camel-agent-prod-1', meta: 'live · 42 tps' },
+  { id: 'x1', category: 'exchange', title: 'exch-aabb1122', meta: 'route: order-ingest' },
+]
+
+interface TableRow {
+  id: string
+  name: string
+  method: string
+  status: string
+  exchanges: number
+}
+
+const TABLE_DATA: TableRow[] = [
+  { id: '1', name: 'order-ingest', method: 'POST', status: 'live', exchanges: 1243 },
+  { id: '2', name: 'payment-validate', method: 'POST', status: 'live', exchanges: 987 },
+  { id: '3', name: 'inventory-check', method: 'GET', status: 'stale', exchanges: 432 },
+  { id: '4', name: 'notify-customer', method: 'POST', status: 'live', exchanges: 876 },
+  { id: '5', name: 'archive-order', method: 'PUT', status: 'dead', exchanges: 54 },
+]
+
+const NOW = new Date()
+const minsAgo = (n: number) => new Date(NOW.getTime() - n * 60 * 1000)
+
+const FEED_EVENTS = [
+  { id: 'ev1', severity: 'success' as const, message: 'Route order-ingest started successfully', timestamp: minsAgo(1) },
+  { id: 'ev2', severity: 'warning' as const, message: 'Agent camel-agent-prod-2 response time elevated', timestamp: minsAgo(3) },
+  { id: 'ev3', severity: 'error' as const, message: 'Exchange exch-aabb1122 failed: timeout', timestamp: minsAgo(7) },
+  { id: 'ev4', severity: 'running' as const, message: 'Processor payment-validate processing batch', timestamp: minsAgo(10) },
+  { id: 'ev5', severity: 'success' as const, message: 'Deployment v3.2.1 completed', timestamp: minsAgo(15) },
+]
+
+const TREE_NODES = [
+  {
+    id: 'app1',
+    label: 'cameleer-prod',
+    icon: '⬡',
+    children: [
+      {
+        id: 'route1',
+        label: 'order-ingest',
+        icon: '→',
+        children: [
+          { id: 'proc1', label: 'ValidateOrder', icon: '◈', meta: '12ms' },
+          { id: 'proc2', label: 'EnrichPayload', icon: '◈', meta: '8ms' },
+          { id: 'proc3', label: 'RouteToQueue', icon: '◈', meta: '3ms' },
+        ],
+      },
+      {
+        id: 'route2',
+        label: 'payment-validate',
+        icon: '→',
+        children: [
+          { id: 'proc4', label: 'TokenizeCard', icon: '◈', meta: '22ms' },
+          { id: 'proc5', label: 'AuthorizePayment', icon: '◈', meta: '45ms' },
+        ],
+      },
+    ],
+  },
+]
+
+// ── CompositesSection ─────────────────────────────────────────────────────────
+
+export function CompositesSection() {
+  // 1. Accordion
+  const accordionItems = [
+    { id: 'a1', title: 'What is Apache Camel?', content: 'Apache Camel is an open-source integration framework based on enterprise integration patterns.' },
+    { id: 'a2', title: 'How do routes work?', content: 'Routes define the path a message takes through the system, from consumer to producer.', defaultOpen: true },
+    { id: 'a3', title: 'What are processors?', content: 'Processors transform, filter, enrich, or route messages as they flow through a route.' },
+  ]
+
+  // 2. AlertDialog
+  const [alertOpen, setAlertOpen] = useState(false)
+  const [alertVariant, setAlertVariant] = useState<'danger' | 'warning' | 'info'>('danger')
+
+  // 7. CommandPalette
+  const [cmdOpen, setCmdOpen] = useState(false)
+
+  // 8. DataTable
+  const tableColumns = [
+    { key: 'name', header: 'Route', sortable: true },
+    { key: 'method', header: 'Method', sortable: true },
+    { key: 'status', header: 'Status', sortable: true },
+    { key: 'exchanges', header: 'Exchanges', sortable: true },
+  ]
+
+  // 9. DetailPanel
+  const [panelOpen, setPanelOpen] = useState(false)
+
+  // 12. FilterBar
+  const filterOptions = [
+    { label: 'Live', value: 'live', color: 'success' as const, count: 12 },
+    { label: 'Stale', value: 'stale', count: 3 },
+    { label: 'Dead', value: 'dead', color: 'error' as const, count: 1 },
+  ]
+  const [activeFilters, setActiveFilters] = useState([{ label: 'Live', value: 'live' }])
+
+  // 15. Modal
+  const [modalOpen, setModalOpen] = useState(false)
+
+  // 19. Tabs
+  const tabItems = [
+    { label: 'Overview', value: 'overview', count: undefined },
+    { label: 'Routes', value: 'routes', count: 14 },
+    { label: 'Agents', value: 'agents', count: 6 },
+  ]
+  const [activeTab, setActiveTab] = useState('overview')
+
+  // 21. TreeView
+  const [selectedNode, setSelectedNode] = useState<string | undefined>('proc1')
+
+  return (
+    <ToastProvider>
+      <section id="composites" className={styles.section}>
+        <h2 className={styles.sectionTitle}>Composites</h2>
+
+        {/* 1. Accordion */}
+        <DemoCard
+          id="accordion"
+          title="Accordion"
+          description="Collapsible panels with single or multiple open mode."
+        >
+          <div className={styles.demoAreaColumn} style={{ width: '100%' }}>
+            <span className={styles.demoLabel}>Single mode (default)</span>
+            <Accordion items={accordionItems} />
+            <span className={styles.demoLabel}>Multiple mode</span>
+            <Accordion
+              items={[
+                { id: 'm1', title: 'Section A', content: 'Content for section A.' },
+                { id: 'm2', title: 'Section B', content: 'Content for section B.', defaultOpen: true },
+                { id: 'm3', title: 'Section C', content: 'Content for section C.', defaultOpen: true },
+              ]}
+              multiple
+            />
+          </div>
+        </DemoCard>
+
+        {/* 2. AlertDialog */}
+        <DemoCard
+          id="alertdialog"
+          title="AlertDialog"
+          description="Modal confirmation dialog in danger, warning, and info variants."
+        >
+          <div className={styles.demoAreaRow}>
+            <Button
+              size="sm"
+              variant="danger"
+              onClick={() => { setAlertVariant('danger'); setAlertOpen(true) }}
+            >
+              Danger dialog
+            </Button>
+            <Button
+              size="sm"
+              variant="secondary"
+              onClick={() => { setAlertVariant('warning'); setAlertOpen(true) }}
+            >
+              Warning dialog
+            </Button>
+            <Button
+              size="sm"
+              variant="ghost"
+              onClick={() => { setAlertVariant('info'); setAlertOpen(true) }}
+            >
+              Info dialog
+            </Button>
+          </div>
+          <AlertDialog
+            open={alertOpen}
+            onClose={() => setAlertOpen(false)}
+            onConfirm={() => setAlertOpen(false)}
+            title={alertVariant === 'danger' ? 'Delete route?' : alertVariant === 'warning' ? 'Proceed with caution?' : 'Confirm action'}
+            description={
+              alertVariant === 'danger'
+                ? 'This will permanently delete the route and all its exchange history. This action cannot be undone.'
+                : alertVariant === 'warning'
+                ? 'This operation will restart all active processors. Running exchanges may be interrupted.'
+                : 'This will update the route configuration and apply changes immediately.'
+            }
+            variant={alertVariant}
+            confirmLabel={alertVariant === 'danger' ? 'Delete' : 'Confirm'}
+          />
+        </DemoCard>
+
+        {/* 3. AreaChart */}
+        <DemoCard
+          id="areachart"
+          title="AreaChart"
+          description="SVG area chart with hover tooltip, threshold line, and legend."
+        >
+          <AreaChart series={CHART_SERIES} xLabel="Time (minutes)" yLabel="Count" width={420} height={180} />
+        </DemoCard>
+
+        {/* 4. AvatarGroup */}
+        <DemoCard
+          id="avatargroup"
+          title="AvatarGroup"
+          description="Stacked avatar group showing up to max avatars with an overflow count."
+        >
+          <div className={styles.demoAreaColumn}>
+            <span className={styles.demoLabel}>max=3, size=sm</span>
+            <AvatarGroup names={['Alice Johnson', 'Bob Smith', 'Carol White', 'David Lee', 'Eve Brown']} max={3} size="sm" />
+            <span className={styles.demoLabel}>max=4, size=md</span>
+            <AvatarGroup names={['Alice Johnson', 'Bob Smith', 'Carol White', 'David Lee', 'Eve Brown']} max={4} size="md" />
+            <span className={styles.demoLabel}>max=2, size=lg</span>
+            <AvatarGroup names={['Alice Johnson', 'Bob Smith', 'Carol White', 'David Lee', 'Eve Brown']} max={2} size="lg" />
+          </div>
+        </DemoCard>
+
+        {/* 5. BarChart */}
+        <DemoCard
+          id="barchart"
+          title="BarChart"
+          description="Bar chart with grouped and stacked modes, hover tooltips, and legend."
+        >
+          <div className={styles.demoAreaColumn}>
+            <span className={styles.demoLabel}>Grouped</span>
+            <BarChart series={BAR_SERIES} width={420} height={180} xLabel="Day" />
+            <span className={styles.demoLabel}>Stacked</span>
+            <BarChart series={BAR_SERIES} stacked width={420} height={180} xLabel="Day" />
+          </div>
+        </DemoCard>
+
+        {/* 6. Breadcrumb */}
+        <DemoCard
+          id="breadcrumb"
+          title="Breadcrumb"
+          description="Slash-separated navigation breadcrumb with linked and plain segments."
+        >
+          <Breadcrumb
+            items={[
+              { label: 'Dashboard', href: '#' },
+              { label: 'Applications', href: '#' },
+              { label: 'order-ingest' },
+            ]}
+          />
+        </DemoCard>
+
+        {/* 7. CommandPalette */}
+        <DemoCard
+          id="commandpalette"
+          title="CommandPalette"
+          description="Full-screen search palette with category tabs, keyboard navigation, and highlight."
+        >
+          <Button size="sm" variant="secondary" onClick={() => setCmdOpen(true)}>
+            Open CommandPalette
+          </Button>
+          <CommandPalette
+            open={cmdOpen}
+            onClose={() => setCmdOpen(false)}
+            onSelect={() => setCmdOpen(false)}
+            data={COMMAND_PALETTE_DATA}
+          />
+        </DemoCard>
+
+        {/* 8. DataTable */}
+        <DemoCard
+          id="datatable"
+          title="DataTable"
+          description="Sortable, paginated table with row click, accent rows, and page size selector."
+        >
+          <div style={{ width: '100%' }}>
+            <DataTable
+              columns={tableColumns}
+              data={TABLE_DATA}
+              sortable
+              pageSize={5}
+            />
+          </div>
+        </DemoCard>
+
+        {/* 9. DetailPanel */}
+        <DemoCard
+          id="detailpanel"
+          title="DetailPanel"
+          description="Slide-in side panel with tabbed content and close button."
+        >
+          <Button size="sm" variant="secondary" onClick={() => setPanelOpen(true)}>
+            Open DetailPanel
+          </Button>
+          <DetailPanel
+            open={panelOpen}
+            onClose={() => setPanelOpen(false)}
+            title="Route: order-ingest"
+            tabs={[
+              { label: 'Overview', value: 'overview', content: <div style={{ padding: '12px 0', fontSize: 13 }}>Route processes ~1,243 exchanges/day with avg latency 42ms.</div> },
+              { label: 'Processors', value: 'processors', content: <div style={{ padding: '12px 0', fontSize: 13 }}>ValidateOrder → EnrichPayload → RouteToQueue</div> },
+              { label: 'Errors', value: 'errors', content: <div style={{ padding: '12px 0', fontSize: 13 }}>3 errors in last 24h. Last: timeout at EnrichPayload.</div> },
+            ]}
+          />
+        </DemoCard>
+
+        {/* 10. Dropdown */}
+        <DemoCard
+          id="dropdown"
+          title="Dropdown"
+          description="Click-triggered dropdown menu with icons, dividers, and disabled items."
+        >
+          <Dropdown
+            trigger={<Button size="sm" variant="secondary">Actions ▾</Button>}
+            items={[
+              { label: 'View details', icon: '👁', onClick: () => undefined },
+              { label: 'Edit route', icon: '✏', onClick: () => undefined },
+              { divider: true, label: '' },
+              { label: 'Restart', icon: '↺', onClick: () => undefined },
+              { label: 'Delete', icon: '✕', onClick: () => undefined, disabled: true },
+            ]}
+          />
+        </DemoCard>
+
+        {/* 11. EventFeed */}
+        <DemoCard
+          id="eventfeed"
+          title="EventFeed"
+          description="Scrollable live event log with severity filters and auto-scroll."
+        >
+          <div style={{ width: '100%' }}>
+            <EventFeed events={FEED_EVENTS} maxItems={10} />
+          </div>
+        </DemoCard>
+
+        {/* 12. FilterBar */}
+        <DemoCard
+          id="filterbar"
+          title="FilterBar"
+          description="Search input combined with filter pills and active filter tag chips."
+        >
+          <div style={{ width: '100%' }}>
+            <FilterBar
+              filters={filterOptions}
+              activeFilters={activeFilters}
+              onFilterChange={setActiveFilters}
+              searchPlaceholder="Search routes..."
+            />
+          </div>
+        </DemoCard>
+
+        {/* 13. LineChart */}
+        <DemoCard
+          id="linechart"
+          title="LineChart"
+          description="Multi-series SVG line chart with hover crosshair, tooltip, and legend."
+        >
+          <LineChart series={CHART_SERIES} xLabel="Time (minutes)" yLabel="Count" width={420} height={180} />
+        </DemoCard>
+
+        {/* 14. MenuItem */}
+        <DemoCard
+          id="menuitem"
+          title="MenuItem"
+          description="Navigation menu row with health dot, meta text, count badge, and active state."
+        >
+          <div className={styles.demoAreaColumn} style={{ minWidth: 200 }}>
+            <MenuItem label="order-ingest" meta="POST route" count={1243} health="live" />
+            <MenuItem label="payment-validate" meta="POST route" count={987} health="live" active />
+            <MenuItem label="inventory-check" meta="GET route" count={432} health="stale" />
+            <MenuItem label="archive-order" meta="PUT route" count={54} health="dead" indent={1} />
+          </div>
+        </DemoCard>
+
+        {/* 15. Modal */}
+        <DemoCard
+          id="modal"
+          title="Modal"
+          description="Portal-rendered modal dialog in sm, md, and lg sizes with backdrop dismiss."
+        >
+          <Button size="sm" variant="secondary" onClick={() => setModalOpen(true)}>
+            Open Modal
+          </Button>
+          <Modal
+            open={modalOpen}
+            onClose={() => setModalOpen(false)}
+            title="Configure Route"
+            size="md"
+          >
+            <div style={{ fontSize: 13, lineHeight: 1.6 }}>
+              <p style={{ margin: '0 0 12px' }}>Adjust the route settings below. Changes will take effect immediately after saving.</p>
+              <p style={{ margin: 0, color: 'var(--text-muted)' }}>Route: order-ingest · Processor chain: 3 steps · Avg latency: 42ms</p>
+            </div>
+          </Modal>
+        </DemoCard>
+
+        {/* 16. Popover */}
+        <DemoCard
+          id="popover"
+          title="Popover"
+          description="Portal-positioned popover in all four positions with arrow indicator."
+        >
+          <div className={styles.demoAreaRow} style={{ paddingTop: 8, paddingBottom: 8 }}>
+            <Popover
+              position="top"
+              trigger={<Button size="sm" variant="secondary">Top</Button>}
+              content={<div style={{ padding: '8px 12px', fontSize: 12 }}>Popover on top</div>}
+            />
+            <Popover
+              position="bottom"
+              trigger={<Button size="sm" variant="secondary">Bottom</Button>}
+              content={<div style={{ padding: '8px 12px', fontSize: 12 }}>Popover on bottom</div>}
+            />
+            <Popover
+              position="left"
+              trigger={<Button size="sm" variant="secondary">Left</Button>}
+              content={<div style={{ padding: '8px 12px', fontSize: 12 }}>Popover on left</div>}
+            />
+            <Popover
+              position="right"
+              trigger={<Button size="sm" variant="secondary">Right</Button>}
+              content={<div style={{ padding: '8px 12px', fontSize: 12 }}>Popover on right</div>}
+            />
+          </div>
+        </DemoCard>
+
+        {/* 17. ProcessorTimeline */}
+        <DemoCard
+          id="processortimeline"
+          title="ProcessorTimeline"
+          description="Horizontal Gantt-style timeline showing processor execution order, duration, and status."
+        >
+          <div style={{ width: '100%' }}>
+            <ProcessorTimeline
+              totalMs={120}
+              processors={[
+                { name: 'ValidateOrder', type: 'validator', durationMs: 12, status: 'ok', startMs: 0 },
+                { name: 'EnrichPayload', type: 'enricher', durationMs: 35, status: 'slow', startMs: 12 },
+                { name: 'RouteToQueue', type: 'router', durationMs: 8, status: 'ok', startMs: 47 },
+                { name: 'AuditLog', type: 'logger', durationMs: 65, status: 'fail', startMs: 55 },
+              ]}
+            />
+          </div>
+        </DemoCard>
+
+        {/* 18. ShortcutsBar */}
+        <DemoCard
+          id="shortcutsbar"
+          title="ShortcutsBar"
+          description="Row of keyboard shortcut hints, each pairing a key badge with a label."
+        >
+          <ShortcutsBar
+            shortcuts={[
+              { keys: 'Ctrl+K', label: 'Search' },
+              { keys: '↑↓', label: 'Navigate' },
+              { keys: 'Enter', label: 'Open' },
+              { keys: 'Esc', label: 'Close' },
+              { keys: '?', label: 'Help' },
+            ]}
+          />
+        </DemoCard>
+
+        {/* 19. Tabs */}
+        <DemoCard
+          id="tabs"
+          title="Tabs"
+          description="Tab bar with optional count badges and active indicator."
+        >
+          <div className={styles.demoAreaColumn} style={{ width: '100%' }}>
+            <Tabs tabs={tabItems} active={activeTab} onChange={setActiveTab} />
+            <div style={{ fontSize: 13, color: 'var(--text-muted)' }}>
+              Active tab: <strong>{activeTab}</strong>
+            </div>
+          </div>
+        </DemoCard>
+
+        {/* 20. Toast */}
+        <DemoCard
+          id="toast"
+          title="Toast"
+          description="Stacked portal toast notifications in four variants with auto-dismiss and manual close."
+        >
+          <ToastDemo />
+        </DemoCard>
+
+        {/* 21. TreeView */}
+        <DemoCard
+          id="treeview"
+          title="TreeView"
+          description="Keyboard-navigable tree showing App → Routes → Processors hierarchy."
+        >
+          <TreeView
+            nodes={TREE_NODES}
+            selectedId={selectedNode}
+            onSelect={setSelectedNode}
+          />
+        </DemoCard>
+      </section>
+    </ToastProvider>
+  )
+}
diff --git a/src/pages/Inventory/sections/LayoutSection.module.css b/src/pages/Inventory/sections/LayoutSection.module.css
new file mode 100644
index 0000000..5f15c00
--- /dev/null
+++ b/src/pages/Inventory/sections/LayoutSection.module.css
@@ -0,0 +1,139 @@
+.section {
+  margin-bottom: 40px;
+}
+
+.sectionTitle {
+  font-size: 22px;
+  font-weight: 700;
+  color: var(--text-primary);
+  margin: 0 0 24px;
+}
+
+.componentCard {
+  background: var(--bg-surface);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-md);
+  padding: 20px;
+  margin-bottom: 16px;
+  box-shadow: var(--shadow-sm);
+}
+
+.componentTitle {
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--text-primary);
+  margin: 0 0 4px;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.componentDesc {
+  font-size: 12px;
+  color: var(--text-muted);
+  margin: 0 0 16px;
+}
+
+.demoArea {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  align-items: flex-start;
+}
+
+.demoAreaColumn {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  align-items: flex-start;
+}
+
+.demoAreaRow {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  align-items: center;
+}
+
+.demoLabel {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-weight: 500;
+}
+
+.demoGroup {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.demoGroupRow {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+/* AppShell diagram */
+.shellDiagram {
+  width: 100%;
+  background: var(--bg-canvas);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  overflow: hidden;
+  font-size: 11px;
+  color: var(--text-muted);
+}
+
+.shellDiagramTop {
+  border-bottom: 1px solid var(--border);
+  padding: 8px 12px;
+  background: var(--bg-overlay);
+  font-weight: 600;
+  color: var(--text-secondary);
+}
+
+.shellDiagramBody {
+  display: flex;
+  height: 140px;
+}
+
+.shellDiagramSide {
+  width: 140px;
+  border-right: 1px solid var(--border);
+  background: var(--bg-overlay);
+  padding: 8px 12px;
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  font-weight: 600;
+  color: var(--text-secondary);
+  flex-shrink: 0;
+}
+
+.shellDiagramMain {
+  flex: 1;
+  padding: 8px 12px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: var(--text-muted);
+  font-style: italic;
+}
+
+/* Sidebar preview container */
+.sidebarPreview {
+  width: 220px;
+  height: 400px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-md);
+  overflow: hidden;
+  flex-shrink: 0;
+}
+
+/* TopBar preview container */
+.topbarPreview {
+  width: 100%;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-md);
+  overflow: hidden;
+}
diff --git a/src/pages/Inventory/sections/LayoutSection.tsx b/src/pages/Inventory/sections/LayoutSection.tsx
new file mode 100644
index 0000000..411a52a
--- /dev/null
+++ b/src/pages/Inventory/sections/LayoutSection.tsx
@@ -0,0 +1,140 @@
+import styles from './LayoutSection.module.css'
+import { Sidebar } from '../../../design-system/layout/Sidebar/Sidebar'
+import { TopBar } from '../../../design-system/layout/TopBar/TopBar'
+
+// ── DemoCard helper ──────────────────────────────────────────────────────────
+
+interface DemoCardProps {
+  id: string
+  title: string
+  description: string
+  children: React.ReactNode
+}
+
+function DemoCard({ id, title, description, children }: DemoCardProps) {
+  return (
+    <div id={id} className={styles.componentCard}>
+      <h3 className={styles.componentTitle}>{title}</h3>
+      <p className={styles.componentDesc}>{description}</p>
+      <div className={styles.demoArea}>{children}</div>
+    </div>
+  )
+}
+
+// ── Sample data ───────────────────────────────────────────────────────────────
+
+const SAMPLE_APPS = [
+  { id: 'app1', name: 'cameleer-prod', agentCount: 3, health: 'live' as const, execCount: 14320 },
+  { id: 'app2', name: 'cameleer-staging', agentCount: 2, health: 'stale' as const, execCount: 871 },
+  { id: 'app3', name: 'cameleer-dev', agentCount: 1, health: 'dead' as const, execCount: 42 },
+]
+
+const SAMPLE_ROUTES = [
+  { id: 'r1', name: 'order-ingest', execCount: 5421 },
+  { id: 'r2', name: 'payment-validate', execCount: 3102 },
+  { id: 'r3', name: 'notify-customer', execCount: 2201 },
+]
+
+const SAMPLE_AGENTS = [
+  {
+    id: 'ag1',
+    name: 'agent-prod-1',
+    service: 'camel-core',
+    version: 'v3.2.1',
+    tps: '42 tps',
+    lastSeen: '1m ago',
+    status: 'live' as const,
+  },
+  {
+    id: 'ag2',
+    name: 'agent-prod-2',
+    service: 'camel-core',
+    version: 'v3.2.1',
+    tps: '38 tps',
+    lastSeen: '2m ago',
+    status: 'live' as const,
+    errorRate: '0.4%',
+  },
+  {
+    id: 'ag3',
+    name: 'agent-staging-1',
+    service: 'camel-core',
+    version: 'v3.1.9',
+    tps: '5 tps',
+    lastSeen: '8m ago',
+    status: 'stale' as const,
+  },
+]
+
+// ── LayoutSection ─────────────────────────────────────────────────────────────
+
+export function LayoutSection() {
+  return (
+    <section id="layout" className={styles.section}>
+      <h2 className={styles.sectionTitle}>Layout</h2>
+
+      {/* 1. AppShell */}
+      <DemoCard
+        id="appshell"
+        title="AppShell"
+        description="Full-page shell that composes Sidebar + TopBar + main content area. Cannot be nested — shown as a structural diagram."
+      >
+        <div className={styles.shellDiagram}>
+          <div className={styles.shellDiagramTop}>
+            TopBar — breadcrumb · search · env badge · shift · user avatar
+          </div>
+          <div className={styles.shellDiagramBody}>
+            <div className={styles.shellDiagramSide}>
+              <span>Sidebar</span>
+              <span style={{ fontWeight: 400, fontSize: 10, marginTop: 4 }}>Logo</span>
+              <span style={{ fontWeight: 400, fontSize: 10 }}>Search</span>
+              <span style={{ fontWeight: 400, fontSize: 10 }}>Navigation</span>
+              <span style={{ fontWeight: 400, fontSize: 10 }}>Applications</span>
+              <span style={{ fontWeight: 400, fontSize: 10 }}>Routes</span>
+              <span style={{ fontWeight: 400, fontSize: 10 }}>Agents</span>
+            </div>
+            <div className={styles.shellDiagramMain}>
+              &lt;children&gt; — page content rendered here
+            </div>
+          </div>
+        </div>
+      </DemoCard>
+
+      {/* 2. Sidebar */}
+      <DemoCard
+        id="sidebar"
+        title="Sidebar"
+        description="Navigation sidebar with app/route/agent sections, search filter, health dots, and exec counts."
+      >
+        <div className={styles.sidebarPreview}>
+          <Sidebar
+            apps={SAMPLE_APPS}
+            routes={SAMPLE_ROUTES}
+            agents={SAMPLE_AGENTS}
+          />
+        </div>
+      </DemoCard>
+
+      {/* 3. TopBar */}
+      <DemoCard
+        id="topbar"
+        title="TopBar"
+        description="Top navigation bar with breadcrumb, search trigger, environment badge, shift info, and user avatar."
+      >
+        <div className={styles.topbarPreview}>
+          <TopBar
+            breadcrumb={[
+              { label: 'Dashboard', href: '#' },
+              { label: 'Applications', href: '#' },
+              { label: 'order-ingest' },
+            ]}
+            environment="production"
+            shift="Morning"
+            user={{ name: 'Hendrik' }}
+            onSearchClick={() => undefined}
+          />
+        </div>
+      </DemoCard>
+    </section>
+  )
+}
diff --git a/src/pages/Inventory/sections/PrimitivesSection.module.css b/src/pages/Inventory/sections/PrimitivesSection.module.css
new file mode 100644
index 0000000..24d9c69
--- /dev/null
+++ b/src/pages/Inventory/sections/PrimitivesSection.module.css
@@ -0,0 +1,74 @@
+.section {
+  margin-bottom: 40px;
+}
+
+.sectionTitle {
+  font-size: 22px;
+  font-weight: 700;
+  color: var(--text-primary);
+  margin: 0 0 24px;
+}
+
+.componentCard {
+  background: var(--bg-surface);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-md);
+  padding: 20px;
+  margin-bottom: 16px;
+  box-shadow: var(--shadow-sm);
+}
+
+.componentTitle {
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--text-primary);
+  margin: 0 0 4px;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.componentDesc {
+  font-size: 12px;
+  color: var(--text-muted);
+  margin: 0 0 16px;
+}
+
+.demoArea {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  align-items: flex-start;
+}
+
+.demoAreaColumn {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  align-items: flex-start;
+}
+
+.demoAreaRow {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  align-items: center;
+}
+
+.demoLabel {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-weight: 500;
+}
+
+.demoGroup {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.demoGroupRow {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
diff --git a/src/pages/Inventory/sections/PrimitivesSection.tsx b/src/pages/Inventory/sections/PrimitivesSection.tsx
new file mode 100644
index 0000000..148bb60
--- /dev/null
+++ b/src/pages/Inventory/sections/PrimitivesSection.tsx
@@ -0,0 +1,591 @@
+import { useState } from 'react'
+import styles from './PrimitivesSection.module.css'
+import {
+  Alert,
+  Avatar,
+  Badge,
+  Button,
+  Card,
+  Checkbox,
+  CodeBlock,
+  Collapsible,
+  DateRangePicker,
+  DateTimePicker,
+  EmptyState,
+  FilterPill,
+  FormField,
+  InfoCallout,
+  Input,
+  KeyboardHint,
+  Label,
+  MonoText,
+  Pagination,
+  ProgressBar,
+  RadioGroup,
+  RadioItem,
+  SectionHeader,
+  Select,
+  Skeleton,
+  Sparkline,
+  Spinner,
+  StatCard,
+  StatusDot,
+  Tag,
+  Textarea,
+  Toggle,
+  Tooltip,
+} from '../../../design-system/primitives'
+
+// ── helpers ──────────────────────────────────────────────────────────────────
+
+interface DemoCardProps {
+  id: string
+  title: string
+  description: string
+  children: React.ReactNode
+}
+
+function DemoCard({ id, title, description, children }: DemoCardProps) {
+  return (
+    <div id={id} className={styles.componentCard}>
+      <h3 className={styles.componentTitle}>{title}</h3>
+      <p className={styles.componentDesc}>{description}</p>
+      <div className={styles.demoArea}>{children}</div>
+    </div>
+  )
+}
+
+// ── Sample data ───────────────────────────────────────────────────────────────
+
+const SPARKLINE_DATA = [10, 25, 15, 30, 20, 35, 28]
+
+const CODE_JSON = JSON.stringify(
+  { status: 'ok', version: '2.4.1', routes: 42 },
+  null,
+  2,
+)
+
+// ── PrimitivesSection ─────────────────────────────────────────────────────────
+
+export function PrimitivesSection() {
+  // Alert state
+  const [alertDismissed, setAlertDismissed] = useState(false)
+
+  // Checkbox state
+  const [checked1, setChecked1] = useState(false)
+  const [checked2, setChecked2] = useState(true)
+
+  // Toggle state
+  const [toggleOn, setToggleOn] = useState(true)
+  const [toggleOff, setToggleOff] = useState(false)
+
+  // Radio state
+  const [radioV, setRadioV] = useState('option-a')
+  const [radioH, setRadioH] = useState('beta')
+
+  // Pagination state
+  const [page, setPage] = useState(5)
+
+  // DateTimePicker state
+  const [dtValue, setDtValue] = useState<Date>(new Date('2026-03-18T09:00'))
+
+  // DateRangePicker state
+  const [dateRange, setDateRange] = useState({
+    start: new Date('2026-03-11T00:00'),
+    end: new Date('2026-03-18T23:59'),
+  })
+
+  return (
+    <section id="primitives" className={styles.section}>
+      <h2 className={styles.sectionTitle}>Primitives</h2>
+
+      {/* 1. Alert */}
+      <DemoCard
+        id="alert"
+        title="Alert"
+        description="Contextual feedback messages in four variants, optionally dismissible."
+      >
+        <div className={styles.demoAreaColumn} style={{ width: '100%' }}>
+          <Alert variant="info" title="Info">This is an informational message.</Alert>
+          <Alert variant="success" title="Success">Operation completed successfully.</Alert>
+          <Alert variant="warning" title="Warning">This action may have side effects.</Alert>
+          {!alertDismissed && (
+            <Alert
+              variant="error"
+              title="Error"
+              dismissible
+              onDismiss={() => setAlertDismissed(true)}
+            >
+              Something went wrong. Dismiss to clear.
+            </Alert>
+          )}
+          {alertDismissed && (
+            <Button size="sm" variant="ghost" onClick={() => setAlertDismissed(false)}>
+              Reset dismissed alert
+            </Button>
+          )}
+        </div>
+      </DemoCard>
+
+      {/* 2. Avatar */}
+      <DemoCard
+        id="avatar"
+        title="Avatar"
+        description="Initials-based avatar with hash-derived colour, three sizes."
+      >
+        <Avatar name="Alice Johnson" size="sm" />
+        <Avatar name="Bob Smith" size="md" />
+        <Avatar name="Carol White" size="lg" />
+      </DemoCard>
+
+      {/* 3. Badge */}
+      <DemoCard
+        id="badge"
+        title="Badge"
+        description="Compact label with semantic colours and a dashed variant."
+      >
+        <Badge label="primary" color="primary" />
+        <Badge label="success" color="success" />
+        <Badge label="warning" color="warning" />
+        <Badge label="error" color="error" />
+        <Badge label="running" color="running" />
+        <Badge label="auto-hash" color="auto" />
+        <Badge label="dashed" color="primary" variant="dashed" />
+      </DemoCard>
+
+      {/* 4. Button */}
+      <DemoCard
+        id="button"
+        title="Button"
+        description="Primary, secondary, danger, and ghost variants across two sizes plus loading state."
+      >
+        <div className={styles.demoAreaColumn}>
+          <div className={styles.demoAreaRow}>
+            <Button variant="primary">Primary</Button>
+            <Button variant="secondary">Secondary</Button>
+            <Button variant="danger">Danger</Button>
+            <Button variant="ghost">Ghost</Button>
+          </div>
+          <div className={styles.demoAreaRow}>
+            <Button variant="primary" size="sm">Small</Button>
+            <Button variant="primary" size="md">Medium</Button>
+            <Button variant="primary" loading>Loading</Button>
+          </div>
+        </div>
+      </DemoCard>
+
+      {/* 5. Card */}
+      <DemoCard
+        id="card"
+        title="Card"
+        description="Surface container with optional left-border accent colour."
+      >
+        <Card><div style={{ padding: '8px 12px', fontSize: 13 }}>Plain card</div></Card>
+        <Card accent="amber"><div style={{ padding: '8px 12px', fontSize: 13 }}>Amber accent</div></Card>
+        <Card accent="success"><div style={{ padding: '8px 12px', fontSize: 13 }}>Success accent</div></Card>
+        <Card accent="error"><div style={{ padding: '8px 12px', fontSize: 13 }}>Error accent</div></Card>
+      </DemoCard>
+
+      {/* 6. Checkbox */}
+      <DemoCard
+        id="checkbox"
+        title="Checkbox"
+        description="Accessible checkbox with optional label, controlled and disabled states."
+      >
+        <Checkbox
+          label="Unchecked"
+          checked={checked1}
+          onChange={(e) => setChecked1(e.target.checked)}
+        />
+        <Checkbox
+          label="Checked"
+          checked={checked2}
+          onChange={(e) => setChecked2(e.target.checked)}
+        />
+        <Checkbox label="Disabled" disabled />
+        <Checkbox label="Disabled checked" disabled defaultChecked />
+      </DemoCard>
+
+      {/* 7. CodeBlock */}
+      <DemoCard
+        id="codeblock"
+        title="CodeBlock"
+        description="Syntax-highlighted code block with line numbers and copy button."
+      >
+        <div style={{ width: '100%' }}>
+          <CodeBlock
+            content={CODE_JSON}
+            language="json"
+            lineNumbers
+            copyable
+          />
+        </div>
+      </DemoCard>
+
+      {/* 8. Collapsible */}
+      <DemoCard
+        id="collapsible"
+        title="Collapsible"
+        description="Animated accordion-style disclosure, open and closed by default."
+      >
+        <div className={styles.demoAreaColumn} style={{ width: '100%' }}>
+          <Collapsible title="Collapsed by default">
+            <p style={{ margin: 0, fontSize: 13 }}>Hidden content revealed on expand.</p>
+          </Collapsible>
+          <Collapsible title="Open by default" defaultOpen>
+            <p style={{ margin: 0, fontSize: 13 }}>This content is visible from the start.</p>
+          </Collapsible>
+        </div>
+      </DemoCard>
+
+      {/* 9. DateTimePicker */}
+      <DemoCard
+        id="datetimepicker"
+        title="DateTimePicker"
+        description="Native datetime-local input wrapped with label and controlled value."
+      >
+        <DateTimePicker
+          label="Pick a date & time"
+          value={dtValue}
+          onChange={(d) => d && setDtValue(d)}
+        />
+      </DemoCard>
+
+      {/* 10. DateRangePicker */}
+      <DemoCard
+        id="daterangepicker"
+        title="DateRangePicker"
+        description="Preset pills combined with two DateTimePicker inputs for a start/end range."
+      >
+        <div style={{ width: '100%' }}>
+          <DateRangePicker value={dateRange} onChange={setDateRange} />
+        </div>
+      </DemoCard>
+
+      {/* 11. EmptyState */}
+      <DemoCard
+        id="emptystate"
+        title="EmptyState"
+        description="Zero-data placeholder with icon, title, description, and action slot."
+      >
+        <EmptyState
+          icon={<span style={{ fontSize: 28 }}>📭</span>}
+          title="No results found"
+          description="Try adjusting your filters or search query."
+          action={<Button size="sm" variant="secondary">Clear filters</Button>}
+        />
+      </DemoCard>
+
+      {/* 12. FilterPill */}
+      <DemoCard
+        id="filterpill"
+        title="FilterPill"
+        description="Toggle-style pill for filter UIs, with optional dot indicator and count."
+      >
+        <FilterPill label="Active" active />
+        <FilterPill label="Inactive" />
+        <FilterPill label="With dot" dot active />
+        <FilterPill label="Count" count={42} />
+      </DemoCard>
+
+      {/* 13. FormField */}
+      <DemoCard
+        id="formfield"
+        title="FormField"
+        description="Field wrapper providing a label, hint text, and inline error messaging."
+      >
+        <div className={styles.demoAreaColumn} style={{ minWidth: 240 }}>
+          <FormField label="Username" htmlFor="inv-username" hint="Letters and numbers only.">
+            <Input id="inv-username" placeholder="e.g. alice42" />
+          </FormField>
+          <FormField label="Email" htmlFor="inv-email" required error="Invalid email address.">
+            <Input id="inv-email" placeholder="you@example.com" />
+          </FormField>
+        </div>
+      </DemoCard>
+
+      {/* 14. InfoCallout */}
+      <DemoCard
+        id="infocallout"
+        title="InfoCallout"
+        description="Bordered callout block in amber, success, warning, and error flavours."
+      >
+        <div className={styles.demoAreaColumn} style={{ width: '100%' }}>
+          <InfoCallout variant="amber" title="Amber">Review before publishing.</InfoCallout>
+          <InfoCallout variant="success" title="Success">Deployment completed.</InfoCallout>
+          <InfoCallout variant="warning" title="Warning">Rate limit approaching.</InfoCallout>
+          <InfoCallout variant="error" title="Error">Build failed — check logs.</InfoCallout>
+        </div>
+      </DemoCard>
+
+      {/* 15. Input */}
+      <DemoCard
+        id="input"
+        title="Input"
+        description="Text input with optional leading icon and placeholder."
+      >
+        <Input placeholder="Plain input" />
+        <Input icon="🔍" placeholder="With icon" />
+      </DemoCard>
+
+      {/* 16. KeyboardHint */}
+      <DemoCard
+        id="keyboardhint"
+        title="KeyboardHint"
+        description="Styled keyboard shortcut badge."
+      >
+        <KeyboardHint keys="Ctrl+K" />
+        <KeyboardHint keys="⌘+P" />
+        <KeyboardHint keys="Esc" />
+      </DemoCard>
+
+      {/* 17. Label */}
+      <DemoCard
+        id="label"
+        title="Label"
+        description="Form label with optional required asterisk."
+      >
+        <Label>Plain label</Label>
+        <Label required>Required label</Label>
+      </DemoCard>
+
+      {/* 18. MonoText */}
+      <DemoCard
+        id="monotext"
+        title="MonoText"
+        description="Monospaced text in xs, sm, and md sizes."
+      >
+        <MonoText size="xs">xs: route-id-001</MonoText>
+        <MonoText size="sm">sm: route-id-001</MonoText>
+        <MonoText size="md">md: route-id-001</MonoText>
+      </DemoCard>
+
+      {/* 19. Pagination */}
+      <DemoCard
+        id="pagination"
+        title="Pagination"
+        description="Page navigation with ellipsis and sibling-window algorithm."
+      >
+        <Pagination
+          page={page}
+          totalPages={20}
+          onPageChange={setPage}
+        />
+      </DemoCard>
+
+      {/* 20. ProgressBar */}
+      <DemoCard
+        id="progressbar"
+        title="ProgressBar"
+        description="Determinate and indeterminate bars across variants and sizes."
+      >
+        <div className={styles.demoAreaColumn} style={{ width: '100%' }}>
+          <ProgressBar value={60} label="60% complete" />
+          <ProgressBar value={60} variant="success" label="Success variant" />
+          <ProgressBar value={60} variant="warning" label="Warning variant" />
+          <ProgressBar value={60} variant="error" label="Error variant" />
+          <ProgressBar value={60} variant="running" label="Running variant" />
+          <ProgressBar indeterminate label="Indeterminate" />
+          <ProgressBar value={60} size="sm" label="Small size" />
+        </div>
+      </DemoCard>
+
+      {/* 21. Radio */}
+      <DemoCard
+        id="radio"
+        title="Radio"
+        description="RadioGroup with vertical and horizontal orientations."
+      >
+        <RadioGroup name="inv-radio-v" value={radioV} onChange={setRadioV} orientation="vertical">
+          <RadioItem value="option-a" label="Option A" />
+          <RadioItem value="option-b" label="Option B" />
+          <RadioItem value="option-c" label="Option C (disabled)" disabled />
+        </RadioGroup>
+        <RadioGroup name="inv-radio-h" value={radioH} onChange={setRadioH} orientation="horizontal">
+          <RadioItem value="alpha" label="Alpha" />
+          <RadioItem value="beta" label="Beta" />
+          <RadioItem value="gamma" label="Gamma" />
+        </RadioGroup>
+      </DemoCard>
+
+      {/* 22. SectionHeader */}
+      <DemoCard
+        id="sectionheader"
+        title="SectionHeader"
+        description="Labelled horizontal divider with an optional right-side action slot."
+      >
+        <div className={styles.demoAreaColumn} style={{ width: '100%' }}>
+          <SectionHeader>Without action</SectionHeader>
+          <SectionHeader action={<Button size="sm" variant="ghost">Add item</Button>}>
+            With action
+          </SectionHeader>
+        </div>
+      </DemoCard>
+
+      {/* 23. Select */}
+      <DemoCard
+        id="select"
+        title="Select"
+        description="Styled native select with custom chevron."
+      >
+        <Select
+          options={[
+            { value: 'opt1', label: 'Option 1' },
+            { value: 'opt2', label: 'Option 2' },
+            { value: 'opt3', label: 'Option 3' },
+          ]}
+        />
+      </DemoCard>
+
+      {/* 24. Skeleton */}
+      <DemoCard
+        id="skeleton"
+        title="Skeleton"
+        description="Loading placeholder in text, circular, and rectangular variants."
+      >
+        <div className={styles.demoAreaColumn}>
+          <Skeleton variant="text" lines={3} width={200} />
+          <Skeleton variant="circular" />
+          <Skeleton variant="rectangular" width={200} height={60} />
+        </div>
+      </DemoCard>
+
+      {/* 25. Sparkline */}
+      <DemoCard
+        id="sparkline"
+        title="Sparkline"
+        description="Lightweight SVG line chart for inline trend visualisation."
+      >
+        <Sparkline data={SPARKLINE_DATA} width={120} height={30} />
+        <Sparkline data={SPARKLINE_DATA} color="var(--success)" width={120} height={30} />
+        <Sparkline data={SPARKLINE_DATA} color="var(--error)" width={120} height={30} />
+      </DemoCard>
+
+      {/* 26. Spinner */}
+      <DemoCard
+        id="spinner"
+        title="Spinner"
+        description="Animated loading indicator in sm, md, and lg sizes."
+      >
+        <Spinner size="sm" />
+        <Spinner size="md" />
+        <Spinner size="lg" />
+      </DemoCard>
+
+      {/* 27. StatCard */}
+      <DemoCard
+        id="statcard"
+        title="StatCard"
+        description="Metric tile with label, value, trend indicator, and inline sparkline."
+      >
+        <StatCard
+          label="Throughput"
+          value="1,433"
+          detail="msg/s"
+          trend="up"
+          trendValue="+12%"
+          accent="amber"
+          sparkline={SPARKLINE_DATA}
+        />
+        <StatCard
+          label="Error rate"
+          value="0.4%"
+          trend="down"
+          trendValue="-0.1pp"
+          accent="error"
+        />
+        <StatCard
+          label="Agents"
+          value="6"
+          detail="all healthy"
+          trend="neutral"
+          trendValue="±0"
+          accent="success"
+        />
+      </DemoCard>
+
+      {/* 28. StatusDot */}
+      <DemoCard
+        id="statusdot"
+        title="StatusDot"
+        description="Small coloured dot for all status variants, with optional pulse animation."
+      >
+        {(['live', 'stale', 'dead', 'success', 'warning', 'error', 'running'] as const).map(
+          (v) => (
+            <div key={v} className={styles.demoGroupRow}>
+              <StatusDot variant={v} />
+              <span style={{ fontSize: 12, color: 'var(--text-secondary)' }}>{v}</span>
+            </div>
+          ),
+        )}
+        <div className={styles.demoGroupRow}>
+          <StatusDot variant="live" pulse />
+          <span style={{ fontSize: 12, color: 'var(--text-secondary)' }}>live + pulse</span>
+        </div>
+      </DemoCard>
+
+      {/* 29. Tag */}
+      <DemoCard
+        id="tag"
+        title="Tag"
+        description="Keyword label with semantic or auto hash colour, and removable variant."
+      >
+        <Tag label="primary" color="primary" />
+        <Tag label="success" color="success" />
+        <Tag label="warning" color="warning" />
+        <Tag label="error" color="error" />
+        <Tag label="auto-hash" color="auto" />
+        <Tag label="removable" color="primary" onRemove={() => undefined} />
+      </DemoCard>
+
+      {/* 30. Textarea */}
+      <DemoCard
+        id="textarea"
+        title="Textarea"
+        description="Multi-line text input with vertical resize by default."
+      >
+        <Textarea placeholder="Enter a description…" style={{ width: 280 }} />
+      </DemoCard>
+
+      {/* 31. Toggle */}
+      <DemoCard
+        id="toggle"
+        title="Toggle"
+        description="On/off switch with optional label."
+      >
+        <Toggle
+          label="Enabled"
+          checked={toggleOn}
+          onChange={(e) => setToggleOn(e.target.checked)}
+        />
+        <Toggle
+          label="Disabled off"
+          checked={toggleOff}
+          onChange={(e) => setToggleOff(e.target.checked)}
+        />
+        <Toggle label="Locked on" checked disabled />
+        <Toggle label="Locked off" disabled />
+      </DemoCard>
+
+      {/* 32. Tooltip */}
+      <DemoCard
+        id="tooltip"
+        title="Tooltip"
+        description="CSS-only hover tooltip in all four positions."
+      >
+        <Tooltip content="Top tooltip" position="top">
+          <Button size="sm" variant="secondary">Top</Button>
+        </Tooltip>
+        <Tooltip content="Bottom tooltip" position="bottom">
+          <Button size="sm" variant="secondary">Bottom</Button>
+        </Tooltip>
+        <Tooltip content="Left tooltip" position="left">
+          <Button size="sm" variant="secondary">Left</Button>
+        </Tooltip>
+        <Tooltip content="Right tooltip" position="right">
+          <Button size="sm" variant="secondary">Right</Button>
+        </Tooltip>
+      </DemoCard>
+    </section>
+  )
+}