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+# Phase 9: Weight Classification and Visualization - Context
+
+**Gathered:** 2026-03-16
+**Status:** Ready for planning
+
+<domain>
+## Phase Boundary
+
+Users can classify each item within a setup as base weight, worn, or consumable (same item can differ across setups). Setup detail view shows weight subtotals by classification and a donut chart for weight distribution, toggleable between category and classification breakdowns. Side-by-side comparison, ranking, and impact preview are separate phases.
+
+</domain>
+
+<decisions>
+## Implementation Decisions
+
+### Classification UI
+- Click-to-cycle badge on each item card within a setup — clicks cycle through base weight → worn → consumable → base weight
+- Follows the StatusBadge pattern from Phase 8 (pill badge, click interaction)
+- Default classification is "base weight" when an item is added to a setup
+- Badge always visible on every item card in the setup (not hidden for default)
+- Muted gray color scheme for all classification badges (bg-gray-100 text-gray-600), consistent with Phase 8 status badges
+- Classification stored on `setup_items` join table (already decided in prior phases)
+
+### Weight subtotals display
+- Summary section below the setup sticky bar, always visible when setup has items
+- Card with columns layout: Base | Worn | Consumable | Total — each as a labeled column with weight value
+- Sticky bar keeps its existing simple stats (item count, total weight, total cost)
+- Summary card is a separate visual element, not inline text
+
+### Chart placement & style
+- Donut chart sits inside the summary card alongside the weight subtotals — chart + numbers as one visual unit
+- Pill toggle above the chart for switching between "Category" and "Classification" views (same style as weight unit selector)
+- Total weight displayed in the center of the donut hole (e.g., "2.87kg")
+- Hover tooltips show segment name, weight (in selected unit), and percentage
+- Chart library: **Recharts** (PieChart + Pie with innerRadius for donut shape)
+
+### Claude's Discretion
+- Summary card exact layout (chart left/right, column arrangement)
+- Chart color palette for segments (should work with both category and classification views)
+- Minimum item threshold for showing chart vs a placeholder message
+- Donut chart sizing and proportions
+- Tooltip styling
+- Keyboard accessibility for classification cycling
+- Animation on chart transitions between category/classification views
+
+</decisions>
+
+<code_context>
+## Existing Code Insights
+
+### Reusable Assets
+- `StatusBadge` (`src/client/components/StatusBadge.tsx`): Click-to-cycle pattern with popup — direct pattern reference for classification badge
+- `formatWeight()` in `src/client/lib/formatters.ts`: Handles unit conversion, reuse for subtotals and chart tooltips
+- `useWeightUnit()` hook: Gets current weight unit setting for display
+- `getSetupWithItems()` in `src/server/services/setup.service.ts`: Fetches setup items with category joins — needs to include classification field
+- `syncSetupItems()`: Delete-all + re-insert pattern — needs to preserve classification values
+
+### Established Patterns
+- Settings stored as key/value strings in SQLite `settings` table
+- React Query for server data, Zustand for UI-only state (panels/dialogs)
+- Pill badges: blue-50/blue-400 for weight, green-50/green-500 for price, gray-50/gray-600 for metadata
+- Weight unit pill toggle in TotalsBar — same pattern for chart category/classification toggle
+- Click-outside + Escape dismiss pattern for popups (CategoryPicker, StatusBadge)
+
+### Integration Points
+- `setup_items` table (`src/db/schema.ts`): Add `classification` column with default "base"
+- `getSetupWithItems()`: Include classification in query results
+- `syncSetupItems()`: Must handle classification when syncing (preserve during re-insert)
+- Setup detail page (`src/client/routes/setups/$setupId.tsx`): Add summary card section, classification badges on ItemCards, donut chart
+- `ItemCard` component: Needs optional `classification` prop and badge (only rendered in setup context)
+- Setup routes (`src/server/routes/setups.ts`): API needs to accept/return classification data
+- Test helper (`tests/helpers/db.ts`): Update CREATE TABLE for setup_items to include classification column
+
+</code_context>
+
+<specifics>
+## Specific Ideas
+
+No specific requirements — user gave clear structural decisions. Standard gear app patterns apply (LighterPack-style classification).
+
+</specifics>
+
+<deferred>
+## Deferred Ideas
+
+None — discussion stayed within phase scope
+
+</deferred>
+
+---
+
+*Phase: 09-weight-classification-and-visualization*
+*Context gathered: 2026-03-16*