diff --git a/docs/memory/component-registry.md b/docs/memory/component-registry.md
index e6fa889..f799a58 100644
--- a/docs/memory/component-registry.md
+++ b/docs/memory/component-registry.md
@@ -85,7 +85,7 @@ duplicates) and MUST update it after completing one.
 | VenueServicesStep | done | WizardLayout (centered-form) + AddOnOption + Card + Typography + Button + Divider | Wizard step 7c — venue services. Compact venue card, availability notices, AddOnOption toggles with "View more" for long descriptions. Follows VenueDetailStep. |
 | CrematoriumStep | done | WizardLayout (centered-form) + Card + Badge + ToggleButtonGroup + Typography + Button + Divider | Wizard step 8 — crematorium. Two variants: Service & Cremation (compact card + witness Yes/No toggle), Cremation Only (compact card + "Cremation Only" badge + "Included in Package" notice). Single pre-selected crematorium, no multi-select. |
 | CemeteryStep | done | WizardLayout (centered-form) + ToggleButtonGroup + Collapse + TextField (select) + Typography + Button + Divider | Wizard step 9 — cemetery. ToggleButtonGroups (Yes/No/Not sure) with progressive disclosure. Own plot → locate dropdown. No plot → preference? → select dropdown. No card grid. |
-| CoffinsStep | done | WizardLayout (centered-form) + Card + Badge + TextField + MenuItem + Pagination + Divider + Button | Wizard step 10 — coffin selection. 3-col card grid with category/price filters. "Most Popular" badge. Pagination. |
+| CoffinsStep | done | WizardLayout (grid-sidebar) + Card + Badge + Collapse + Slider + TextField + Pagination + Divider + Link | Wizard step 10 — coffin browsing. Grid-sidebar: filter sidebar (categories with expandable subcategories, dual-knob price slider with editable inputs, sort by) + 3-col card grid. CoffinCard with thumbnail hover preview. Equal-height cards, subtle bg for white-bg product photos. Card click → CoffinDetailsStep (no Continue). 20/page max. Conditional allowance info bubble. |
 | CoffinDetailsStep | done | WizardLayout (centered-form) + Paper + RadioGroup + Divider + Button | Wizard step 11 — coffin customisation. Profile (image + specs) + 3 option sections (handles, lining, nameplate). Branded selected state. |
 | AdditionalServicesStep | done | WizardLayout (centered-form) + Paper + AddOnOption + RadioGroup + Collapse + Divider + Button | Wizard step 12 — additional services. Section 1: complimentary. Section 2: paid extras. Multi-level progressive disclosure. |
 | SummaryStep | done | WizardLayout (centered-form) + Accordion + Paper + IconButton + Divider + Button | Wizard step 13 — plan review. Accordion sections with edit buttons. dl/dt/dd definition lists. Total bar. Share button. |
diff --git a/docs/memory/session-log.md b/docs/memory/session-log.md
index 94c4f99..a0b87ac 100644
--- a/docs/memory/session-log.md
+++ b/docs/memory/session-log.md
@@ -26,6 +26,38 @@ Each entry follows this structure:
 
 ## Sessions
 
+### Session 2026-03-31a — CoffinsStep rewrite: grid-sidebar ecommerce layout
+
+**Agent(s):** Claude Opus 4.6 (1M context)
+
+**Work completed:**
+- **CoffinsStep complete rewrite** — transformed from wide-form card grid into a two-column ecommerce layout matching the live site pattern:
+  - **Layout:** `grid-sidebar` with viewport-locked independent scrolling (sidebar scrollbar on hover, grid always scrollable)
+  - **Sidebar:** heading, conditional allowance info bubble, category menu with expandable subcategories (Collapse animation, chevron rotation), dual-knob price range slider with editable text inputs (commit on blur/Enter), sort by dropdown (popularity, price asc/desc), clear all filters link, save-and-exit link at bottom
+  - **Grid:** 3-col coffin card grid with `CoffinCard` internal component — thumbnail hover preview (hover swaps main image, leave reverts), equal-height cards via flex layout, subtle background for white-bg product photos, "Most Popular" badge, colour count text
+  - **Navigation:** card click fires `onSelectCoffin(id)` to navigate to CoffinDetailsStep — no Continue button
+  - **Pagination:** 20 coffins per page max (`pageSize` prop, enforced via slice)
+- **WizardLayout `grid-sidebar` update** — wider sidebar (28%), `overflowX: hidden` (no horizontal scroll), `overflowY: auto` at all breakpoints, responsive viewport-lock (desktop only)
+- **Removed:** `selectedCoffinId`, `CoffinsStepErrors`, `CoffinPriceRange`, `onContinue`, `loading` props
+- **Added:** `onSelectCoffin`, `CoffinSortBy`, `pageSize`, `minPrice`/`maxPrice`, `thumbnails`/`colourCount` on Coffin, `children` on `CoffinCategory`
+
+**Decisions made:**
+- Card click navigates directly to details (no selection + continue pattern) — matches ecommerce browsing UX
+- Categories support one level of subcategories — parent click loads all and expands children, child click refines
+- Price slider with editable text inputs — commits on blur/Enter to avoid per-keystroke re-renders
+- 20 coffins per page default — enforced in component via slice
+- Allowance info bubble is conditional (omit prop = no bubble) — some packages don't have coffin allowances
+
+**Open questions:**
+- None
+
+**Next steps:**
+- Continue page feedback: AdditionalServicesStep, SummaryStep, PaymentStep, ConfirmationStep
+- Retroactive review Phase 3 (organisms) still pending
+- Batch a11y fix (aria-describedby + aria-invalid) deferred
+
+---
+
 ### Session 2026-03-30e — Page feedback: VenueServices, Crematorium, Cemetery rewrites
 
 **Agent(s):** Claude Opus 4.6 (1M context)