diff --git a/C-progress.md b/C-progress.md
index e1c77b8..5f90047 100644
--- a/C-progress.md
+++ b/C-progress.md
@@ -19,7 +19,16 @@ Round-5 §Lane C task 1 (the v1.1 gate). Lane E's re-exports mapped + validated
 - Report + decision detail: [LANE_C_GLB_VALIDATION.md](docs/LANES/LANE_C_GLB_VALIDATION.md); F note in
   [LANE_C_NOTES.md](docs/LANES/LANE_C_NOTES.md). **→ F: C1 committed, v1.1 can be tagged.**
 
-Still in flight this round: C2 `?dig=1` crate-riffle (v2, behind flag), C3 record re-measure (after E's bake).
+**C2 — `?dig=1` crate-riffle (v2, behind flag).** Ported 90sDJsim `dig.js` → `web/js/interiors/dig.js`:
+walk to a record bin, press **E**, riffle its sleeves (scroll/drag), click the front to pull, **BUY IT**
+(STUBBED — toast + remove; getCash constant; real economy is round 6+). Riffle items are seeded per bin
+via the `stockAdapter(shop,'sleeve')` seam (procedural fallback now — parody 90s-AU sleeves). Own scene +
+camera, procedural fwip/thunk audio, **leak-free** (per-open resources freed on close → dig soak 20×
+`leakGeo 0 / leakTex 0`). Flag-off (`?dig=0`) is **byte-identical** — `buildInterior` is untouched; the dig
+is wired only in the test page (F owns the shell seam — hook documented in LANE_C_NOTES §"input/mode hook").
+Shot: [dig_riffle_r5.jpg](docs/shots/laneC/dig_riffle_r5.jpg).
+
+Still in flight: C3 record re-measure — blocked on Lane E's hero-prop bake landing (don't wait, per §Lane C).
 
 ---
 
diff --git a/docs/shots/laneC/dig_riffle_r5.jpg b/docs/shots/laneC/dig_riffle_r5.jpg
new file mode 100644
index 0000000..38a7cb4
Binary files /dev/null and b/docs/shots/laneC/dig_riffle_r5.jpg differ
diff --git a/web/interior_test.html b/web/interior_test.html
index 27db6d3..8d37813 100644
--- a/web/interior_test.html
+++ b/web/interior_test.html
@@ -70,6 +70,7 @@
 import * as THREE from 'three';
 import { PointerLockControls } from 'three/addons/controls/PointerLockControls.js';
 import { buildInterior, SHOP_TYPES, ARCHETYPE_KEYS } from './js/interiors/interiors.js';
+import { createDig, binSeed } from './js/interiors/dig.js';
 
 // ── renderer / scene / camera ──────────────────────────────────────────────
 const app = document.getElementById('app');
@@ -98,7 +99,7 @@ for (const t of SHOP_TYPES) { const o = document.createElement('option'); o.valu
 archSel.appendChild(new Option('auto', 'auto'));
 for (const a of ARCHETYPE_KEYS) archSel.appendChild(new Option(a, a));
 
-let current = null;                 // the live interior
+let current = null, curSeed = 0;    // the live interior + the seed it was built from (dig per-bin seeding)
 let gridHelper = null, pathHelper = null;
 let wire = false, showGrid = false, showPath = false, useGLB = false;
 let glbManifest = null;             // Lane E manifest → GLB props load via the live depot: path (all 22 GLBs published).
@@ -111,9 +112,11 @@ function parseLot(v) {
 }
 
 function rebuild() {
+  if (dig && dig.active) dig.close();
   if (current) current.dispose();
   clearDebug();
   const seed = parseInt($('seed').value, 10) >>> 0;
+  curSeed = seed;
   const type = typeSel.value;
   const arch = archSel.value === 'auto' ? undefined : archSel.value;
   const lot = parseLot($('lot').value);
@@ -291,17 +294,55 @@ async function soak(N = 50) {
 }
 $('soakBtn').onclick = () => soak(50);
 
+// ── dig (?dig=1) — walk to a record bin, press E to riffle its sleeves (v2, flag-gated) ──
+const DIG_ON = new URLSearchParams(location.search).has('dig');
+let dig = null;
+const _digRay = new THREE.Raycaster();
+function binUnderAim() {
+  if (!current) return null;
+  const bins = []; current.group.traverse(o => { if (o.userData && o.userData.kind === 'bin') bins.push(o); });
+  if (!bins.length) return null;
+  _digRay.setFromCamera({ x: 0, y: 0 }, camera);
+  const hit = _digRay.intersectObjects(bins, true)[0];
+  if (hit && hit.distance < 3.2) { let o = hit.object; while (o && !(o.userData && o.userData.kind === 'bin')) o = o.parent; return o; }
+  let best = null, bd = 2.4; const cp = camera.position, p = new THREE.Vector3();
+  for (const b of bins) { b.getWorldPosition(p); const d = p.distanceTo(cp); if (d < bd) { bd = d; best = b; } }
+  return best;
+}
+function openDigOn(bin) {
+  if (!dig) dig = createDig(THREE, renderer);
+  if (controls.isLocked) controls.unlock();
+  const p = new THREE.Vector3(); bin.getWorldPosition(p);
+  const key = Math.round(p.x * 100) + '_' + Math.round(p.z * 100);   // stable per-bin key (deterministic position)
+  dig.open({ seed: binSeed(curSeed, key), count: 16, shopName: current.recipe.label,
+             getCash: () => 50, onBuy: () => true, onClose: () => {} });
+}
+if (DIG_ON) {
+  addEventListener('keydown', e => { if (e.code === 'KeyE' && current && (!dig || !dig.active)) { const b = binUnderAim(); if (b) openDigOn(b); } });
+  document.getElementById('hint').innerHTML += ' · <b>E</b> riffle a record bin';
+}
+// enter+leave a dig per record room, assert leak-free (round-5 acceptance)
+async function digSoak(N = 15) {
+  if (!dig) dig = createDig(THREE, renderer);
+  dig.open({ seed: 1, count: 16 }); renderer.render(dig.scene, dig.camera); dig.close(); renderer.render(scene, camera);
+  const bG = renderer.info.memory.geometries, bT = renderer.info.memory.textures;
+  for (let i = 0; i < N; i++) { dig.open({ seed: (i * 7919 + 1) >>> 0, count: 10 + (i % 9) }); renderer.render(dig.scene, dig.camera); dig.close(); }
+  renderer.render(scene, camera);
+  return { rooms: N, leakGeo: renderer.info.memory.geometries - bG, leakTex: renderer.info.memory.textures - bT };
+}
+
 // ── loop ───────────────────────────────────────────────────────────────────────
 let last = performance.now();
 function frame() {
   const now = performance.now(), dt = Math.min(0.05, (now - last) / 1000); last = now;
-  move(dt);
-  renderer.render(scene, camera);
+  if (dig && dig.active) { dig.update(dt); renderer.render(dig.scene, dig.camera); }
+  else { move(dt); renderer.render(scene, camera); }
   requestAnimationFrame(frame);
 }
 
 // expose for headless verification (screenshot harness, workflow checks)
-window.PROCITY_C = { buildInterior, THREE, SHOP_TYPES, ARCHETYPE_KEYS, soak, rebuild, get current() { return current; }, scene, camera, renderer };
+window.PROCITY_C = { buildInterior, THREE, SHOP_TYPES, ARCHETYPE_KEYS, soak, rebuild, get current() { return current; }, scene, camera, renderer,
+                     DIG_ON, digSoak, openDigOn, binUnderAim, get dig() { return dig; } };
 
 rebuild();
 frame();
diff --git a/web/js/interiors/dig.js b/web/js/interiors/dig.js
new file mode 100644
index 0000000..c3476a7
--- /dev/null
+++ b/web/js/interiors/dig.js
@@ -0,0 +1,311 @@
+// PROCITY Lane C — crate riffle, ported from 90sDJsim/web/world/dig.js (itself from thriftgod/RecordGod).
+// v2 headline behind `?dig=1`: walk to a record bin → flip through its sleeves, pull one, "buy" it.
+//
+// Scope (round 5): the riffled items are the EXISTING procedural stock — a seeded sleeve list per bin
+// (same seed ⇒ same order). Real records feed in later via `stockAdapter(shop, 'sleeve')` (round 6+,
+// GODVERSE/mint). **Buy is STUBBED** (a toast + remove-from-bin; getCash returns a constant).
+//
+// Self-contained: own scene + camera, procedural fwip/thunk audio (no assets), and LEAK-FREE — every
+// geometry/material/CanvasTexture minted here is tracked and freed on close()/dispose(). Nothing here
+// runs unless the shell/test-page opens it, so `?dig=0` is byte-identical to v1.
+
+import { mulberry32, xmur3 } from '../core/prng.js';
+
+const MAXFLIP = 1.95, BACK = -0.12;
+const SLEEVE = [0.31, 0.31, 0.0060];           // w, h, thickness (packed a touch chunkier than vinyl)
+// 90s-Australian crate genres → sleeve card colour.
+const GENRE = [['ROCK', '#7a2a3a'], ['SOUL', '#b0894a'], ['JAZZ', '#2a4a6a'], ['DISCO', '#8a3a7a'],
+               ['COUNTRY', '#6a5a2a'], ['PUNK', '#3a3a3a'], ['REGGAE', '#2a6a4a'], ['POP', '#b05a8a']];
+const ARTISTS = ['THE VERANDAHS', 'DEZ & THE UTES', 'MERINO', 'HILLS HOIST', 'THE ESKIES', 'GOON BAG',
+                 'STOBIE POLES', 'THE FIBROS', 'WARATAH', 'THONGS', 'THE CLOTHESLINE', 'GALAH'];
+const TITLES = ['Sunburnt', 'Back o’ Bourke', 'Servo at Midnight', 'Long Weekend', 'Tinny',
+                'Southerly Buster', 'Milk Bar Dreams', 'Cane Toad Blues', 'Ute Muster', 'Arvo'];
+const CONDS = ['VG+', 'VG', 'G+', 'NM', 'EX'];
+
+// Deterministic sleeve list for a bin — the "existing procedural stock" as riffle-able offers.
+function proceduralSleeves(seed, n) {
+  const r = mulberry32(seed >>> 0);
+  const out = [];
+  for (let i = 0; i < n; i++) {
+    const g = GENRE[(r() * GENRE.length) | 0];
+    out.push({
+      i, kind: 'record',
+      a: ARTISTS[(r() * ARTISTS.length) | 0],
+      t: TITLES[(r() * TITLES.length) | 0],
+      y: 1971 + ((r() * 28) | 0),
+      s: g[0], color: g[1],
+      cond: CONDS[(r() * CONDS.length) | 0],
+      price: 2 + ((r() * 28) | 0),
+      rare: r() < 0.12,
+    });
+  }
+  return out;
+}
+
+export function createDig(THREE, renderer) {
+  // ── tracked resources (leak-free) ──
+  // Persistent (p*): the fixed set — floor, backdrop, shared sleeve geometry — freed only on dispose().
+  // Per-open (o*): sleeve textures/materials + crate parts — freed on EVERY close() so repeated
+  // open/close (e.g. the soak entering a dig per interior) returns to baseline.
+  const pGeo = new Set(), pMat = new Set(), pTex = new Set();
+  const oGeo = new Set(), oMat = new Set(), oTex = new Set();
+  const trackGeo = g => (pGeo.add(g), g);
+  const trackMat = m => (pMat.add(m), m);
+  const trackTex = t => (pTex.add(t), t);
+
+  const scene = new THREE.Scene();
+  scene.background = new THREE.Color(0x14110c);
+  const camera = new THREE.PerspectiveCamera(45, innerWidth / innerHeight, 0.01, 50);
+  camera.position.set(0, 0.5, 0.92);
+  camera.lookAt(0, 0.12, -0.2);
+  const onResize = () => { camera.aspect = innerWidth / innerHeight; camera.updateProjectionMatrix(); };
+  addEventListener('resize', onResize);
+
+  scene.add(new THREE.AmbientLight(0xfff4de, 0.55));
+  const spot = new THREE.SpotLight(0xfff2e6, 26, 5, 0.7, 0.5, 1.2);
+  spot.position.set(0.4, 1.5, 0.9); spot.target.position.set(0, 0, -0.3);
+  scene.add(spot, spot.target);
+  const floor = new THREE.Mesh(trackGeo(new THREE.BoxGeometry(1.4, 0.02, 1.4)),
+    trackMat(new THREE.MeshStandardMaterial({ color: 0x2a2318, roughness: 0.9 })));
+  floor.position.set(0.3, -0.011, -0.35); scene.add(floor);
+  // a warm gradient backdrop (canvas — no external art), so the sleeves stay the subject
+  const back = new THREE.Mesh(trackGeo(new THREE.PlaneGeometry(5.5, 3.1)),
+    trackMat(new THREE.MeshBasicMaterial({ map: backdropTex() })));
+  back.position.set(0, 0.35, -2.8); scene.add(back);
+  function backdropTex() {
+    const cv = document.createElement('canvas'); cv.width = 64; cv.height = 48;
+    const x = cv.getContext('2d');
+    const g = x.createLinearGradient(0, 0, 0, 48);
+    g.addColorStop(0, '#2a2016'); g.addColorStop(1, '#0e0b07');
+    x.fillStyle = g; x.fillRect(0, 0, 64, 48);
+    const t = new THREE.CanvasTexture(cv); t.colorSpace = THREE.SRGBColorSpace; return trackTex(t);
+  }
+
+  // ── sleeve art (cardboard card + genre + $ sticker) — matches the interior stock aesthetic ──
+  function sleeveTexture(o) {
+    const cv = document.createElement('canvas'); cv.width = cv.height = 256;
+    const c = cv.getContext('2d');
+    c.fillStyle = o.color; c.fillRect(0, 0, 256, 256);
+    c.fillStyle = 'rgba(0,0,0,.22)'; c.fillRect(0, 0, 256, 12); c.fillRect(0, 244, 256, 12);
+    c.strokeStyle = 'rgba(255,255,255,.28)'; c.lineWidth = 3; c.strokeRect(14, 14, 228, 228);
+    c.fillStyle = 'rgba(255,255,255,.92)'; c.textAlign = 'center';
+    c.font = '700 22px "Courier New",monospace'; c.fillText(o.a.slice(0, 18), 128, 80);
+    c.fillStyle = 'rgba(255,255,255,.75)'; c.font = '17px "Courier New",monospace';
+    c.fillText('“' + o.t + '”', 128, 116);
+    c.fillStyle = 'rgba(0,0,0,.4)'; c.font = '14px "Courier New",monospace';
+    c.fillText(`${o.y} · ${o.s} · ${o.cond}`, 128, 210);
+    c.beginPath(); c.arc(210, 48, 30, 0, 7); c.fillStyle = '#f4e11a'; c.fill();  // price sticker
+    c.fillStyle = '#c1121f'; c.font = '700 20px Arial'; c.fillText('$' + o.price, 210, 55);
+    if (o.rare) { c.fillStyle = '#ffd23d'; c.font = '20px monospace'; c.fillText('★', 34, 232); }
+    const t = new THREE.CanvasTexture(cv); t.colorSpace = THREE.SRGBColorSpace; t.anisotropy = 4;
+    oTex.add(t); return t;   // per-open → freed on close()
+  }
+
+  let recs = [], cursor = 0, vel = 0, active = false, pulled = null, lastFloor = -1;
+  let crate = null, offers = [], onCloseCb = null, onBuyCb = null, getCashCb = null;
+  // shared across opens (persistent): sleeves are all the same box; sides + crate timber never vary
+  const sleeveGeo = trackGeo(new THREE.BoxGeometry(SLEEVE[0], SLEEVE[1], SLEEVE[2]));
+  const sideMat = trackMat(new THREE.MeshStandardMaterial({ color: 0x8a8070, roughness: 0.85 }));
+  const crateWood = trackMat(new THREE.MeshStandardMaterial({ color: 0x8a6a45, roughness: 0.85 }));
+
+  // ── DOM overlay (hint / cursor label / pull panel / walk-out) ──
+  const el = (tag, cls, txt) => { const e = document.createElement(tag); e.className = cls; if (txt) e.textContent = txt; return e; };
+  const css = el('style'); css.textContent = `
+    .pcdg-hint{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);background:rgba(0,0,0,.7);color:#d8d8e0;padding:6px 14px;font:13px "Courier New",monospace;pointer-events:none;display:none;z-index:60}
+    .pcdg-cur{position:fixed;left:50%;top:64px;transform:translateX(-50%);color:#ffd23d;font:700 15px "Courier New",monospace;text-shadow:0 1px 4px #000;pointer-events:none;text-align:center;max-width:80%;display:none;z-index:60}
+    .pcdg-panel{position:fixed;right:6%;top:50%;transform:translateY(-50%);width:250px;background:#0e0e16;border:1px solid #ffd23d;padding:16px;color:#d8d8e0;font:14px "Courier New",monospace;display:none;z-index:61}
+    .pcdg-panel h3{margin:.1em 0;color:#ffd23d;font-size:15px}
+    .pcdg-panel .meta{color:#8a8a9a;font-size:12px;margin:4px 0 8px}
+    .pcdg-panel .price{font-size:24px;color:#3dff8b}
+    .pcdg-panel button{margin-top:12px;width:100%;padding:9px;border:1px solid #666;background:#1d1d2b;color:#d8d8e0;font:inherit;cursor:pointer}
+    .pcdg-panel button:hover{border-color:#3dff8b;color:#3dff8b}
+    .pcdg-panel .x{position:absolute;top:6px;right:11px;cursor:pointer;color:#888}
+    .pcdg-out{position:fixed;left:16px;top:16px;background:#1d1d2b;border:1px solid #666;color:#d8d8e0;padding:8px 14px;font:13px "Courier New",monospace;cursor:pointer;display:none;z-index:60}
+    .pcdg-out:hover{border-color:#3dff8b;color:#3dff8b}
+    .pcdg-toast{position:fixed;left:50%;top:40%;transform:translate(-50%,-50%);background:#0e0e16;border:1px solid #3dff8b;color:#3dff8b;padding:14px 22px;font:700 15px "Courier New",monospace;z-index:62;display:none}`;
+  document.head.appendChild(css);
+  const hint = el('div', 'pcdg-hint', 'scroll / drag to riffle · click the front sleeve to pull it · Esc / WALK OUT to leave');
+  const curLbl = el('div', 'pcdg-cur');
+  const panel = el('div', 'pcdg-panel');
+  const outBtn = el('div', 'pcdg-out', '← WALK OUT');
+  const toast = el('div', 'pcdg-toast');
+  outBtn.onclick = () => close();
+  document.body.append(hint, curLbl, panel, outBtn, toast);
+
+  // ── procedural audio ──
+  let actx;
+  function blip(kind) {
+    try {
+      actx = actx || new (window.AudioContext || window.webkitAudioContext)();
+      if (kind === 'fwip') {
+        const n = Math.floor(actx.sampleRate * 0.05), buf = actx.createBuffer(1, n, actx.sampleRate), d = buf.getChannelData(0);
+        for (let i = 0; i < n; i++) d[i] = (Math.sin(i * 0.7) * (1 - i / n)) * 0.6;   // deterministic-ish fwip (no Math.random)
+        const s = actx.createBufferSource(); s.buffer = buf;
+        const f = actx.createBiquadFilter(); f.type = 'bandpass'; f.frequency.value = 2100; f.Q.value = 0.7;
+        const g = actx.createGain(); g.gain.value = 0.2;
+        s.connect(f); f.connect(g); g.connect(actx.destination); s.start();
+      } else {
+        const o = actx.createOscillator(); o.type = 'sine'; o.frequency.value = 105;
+        const g = actx.createGain(); g.gain.setValueAtTime(0.0001, actx.currentTime);
+        g.gain.exponentialRampToValueAtTime(0.5, actx.currentTime + 0.005);
+        g.gain.exponentialRampToValueAtTime(0.0001, actx.currentTime + 0.28);
+        o.connect(g); g.connect(actx.destination); o.start(); o.stop(actx.currentTime + 0.3);
+      }
+    } catch (e) {}
+  }
+
+  function buildCrate(depth) {
+    if (crate) { scene.remove(crate); crate = null; }
+    crate = new THREE.Group();
+    const [w, h] = SLEEVE;
+    const W = w + 0.06, H = h * 0.72, D = depth + 0.10, th = 0.016;
+    const add = (bw, bh, bd, x, y, z) => { const g = new THREE.BoxGeometry(bw, bh, bd); oGeo.add(g); const m = new THREE.Mesh(g, crateWood); m.position.set(x, y, z); crate.add(m); };
+    add(W, th, D, 0, -th / 2, -D / 2 + 0.05);
+    add(th, H, D, -W / 2, H / 2, -D / 2 + 0.05); add(th, H, D, W / 2, H / 2, -D / 2 + 0.05);
+    add(W, H, th, 0, H / 2, -D + 0.05); add(W, H * 0.55, th, 0, H * 0.275, 0.05);
+    scene.add(crate);
+  }
+
+  function buildStack(list) {
+    recs.forEach(r => scene.remove(r.group)); recs = [];
+    const [w, h, th] = SLEEVE;
+    let z = -0.05;
+    list.forEach((o, i) => {
+      const grp = new THREE.Group(); grp.position.set(0, 0, z);
+      const face = new THREE.MeshStandardMaterial({ map: sleeveTexture(o), roughness: 0.75 }); oMat.add(face);
+      const mesh = new THREE.Mesh(sleeveGeo, [sideMat, sideMat, sideMat, sideMat, face, sideMat]);   // shared sleeve geo
+      mesh.position.y = h / 2;
+      grp.add(mesh); grp.rotation.x = BACK;
+      grp.rotation.z = (((i * 2654435761) >>> 0) % 100 - 50) / 1800;   // each sleeve leans its own way (seeded by index)
+      grp.position.x = (((i * 40503) >>> 0) % 100 - 50) / 12000;
+      scene.add(grp);
+      recs.push({ group: grp, offer: o, angle: BACK, homeZ: z });
+      z -= th + 0.010;
+    });
+    buildCrate(Math.max(0.2, -z));
+    cursor = 0; vel = 0; lastFloor = -1; updateCur();
+  }
+
+  function updateCur() {
+    const r = recs[Math.round(cursor)];
+    curLbl.textContent = r ? `${r.offer.a} — “${r.offer.t}”` : (recs.length ? '' : 'bin’s cleaned out');
+  }
+
+  function removeEntry(entry) {
+    const idx = recs.indexOf(entry); if (idx < 0) return;
+    scene.remove(entry.group); recs.splice(idx, 1);
+    let z = -0.05;
+    recs.forEach(x => { x.homeZ = z; x.group.position.z = z; z -= SLEEVE[2] + 0.010; });
+    cursor = Math.min(cursor, Math.max(0, recs.length - 1));
+    pulled = null; panel.style.display = 'none'; updateCur();
+  }
+
+  function showPanel(entry) {
+    const o = entry.offer;
+    const cash = getCashCb ? getCashCb() : 999;
+    panel.innerHTML = `<div class="x">✕</div><h3>${o.a}</h3>`
+      + `<div class="meta">“${o.t}” · ${o.y} ${o.s} · ${o.cond}${o.rare ? ' · ★ RARE' : ''}</div>`
+      + `<div class="price">$${o.price}</div>`
+      + `<button ${o.price > cash ? 'disabled' : ''}>${o.price > cash ? 'not enough cash' : 'BUY IT'}</button>`;
+    panel.style.display = 'block';
+    panel.querySelector('.x').onclick = unpull;
+    const b = panel.querySelector('button');
+    if (b && !b.disabled) b.onclick = () => {
+      // STUB economy (round 6+): onBuy may veto; default is a toast + remove-from-bin.
+      const ok = onBuyCb ? onBuyCb(o) : true;
+      if (ok === false) { unpull(); return; }
+      blip('thunk');
+      showToast(`SOLD — ${o.a} · $${o.price}`);
+      removeEntry(entry);
+    };
+  }
+  let toastT = null;
+  function showToast(msg) { toast.textContent = msg; toast.style.display = 'block'; clearTimeout(toastT); toastT = setTimeout(() => (toast.style.display = 'none'), 1400); }
+
+  function pull() { const r = recs[Math.round(cursor)]; if (!r) return; pulled = r; blip('thunk'); showPanel(r); }
+  function unpull() { if (pulled) pulled.group.position.set(pulled.group.position.x, 0, pulled.homeZ); pulled = null; panel.style.display = 'none'; updateCur(); }
+
+  function update(dt) {
+    if (!active) return;
+    vel *= Math.pow(0.0008, dt);
+    cursor += vel * dt;
+    if (cursor < 0) { cursor = 0; vel = 0; }
+    if (cursor > recs.length - 1) { cursor = Math.max(0, recs.length - 1); vel = 0; }
+    const fl = Math.floor(cursor);
+    if (fl !== lastFloor) { lastFloor = fl; blip('fwip'); updateCur(); }
+    recs.forEach((r, i) => {
+      const f = THREE.MathUtils.smoothstep(cursor - i, -0.4, 1.2);
+      const target = BACK + f * (MAXFLIP - BACK);
+      r.angle += (target - r.angle) * Math.min(1, dt * 12);
+      if (r !== pulled) r.group.rotation.x = r.angle;
+    });
+    if (pulled) {
+      pulled.group.position.lerp(new THREE.Vector3(0, 0.42, 0.55), Math.min(1, dt * 5));
+      pulled.group.rotation.x += (0 - pulled.group.rotation.x) * Math.min(1, dt * 6);
+    }
+  }
+
+  // ── input ──
+  let dragY = null, moved = 0;
+  const onWheel = e => { if (!active) return; e.preventDefault(); vel += e.deltaY * 0.012; };
+  const onDown = e => { if (!active) return; dragY = e.clientY; moved = 0; };
+  const onMove = e => { if (!active || dragY == null) return; const dy = e.clientY - dragY; moved += Math.abs(dy); cursor += dy * 0.02; vel = dy * 0.6; dragY = e.clientY; };
+  const onUp = () => { if (!active) return; if (moved < 4 && !pulled) pull(); dragY = null; };
+  const onKey = e => { if (!active) return; if (e.key === 'Escape') { e.stopPropagation(); if (pulled) unpull(); else close(); } };
+  renderer.domElement.addEventListener('wheel', onWheel, { passive: false });
+  renderer.domElement.addEventListener('pointerdown', onDown);
+  renderer.domElement.addEventListener('pointermove', onMove);
+  renderer.domElement.addEventListener('pointerup', onUp);
+  document.addEventListener('keydown', onKey, true);
+
+  // open({ seed, count, shopName, shop, stockAdapter, onClose, onBuy, getCash })
+  function open(opts = {}) {
+    active = true;
+    onCloseCb = opts.onClose || null; onBuyCb = opts.onBuy || null; getCashCb = opts.getCash || null;
+    const count = opts.count || 16;
+    // riffle items: the stockAdapter seam (real records later) or the seeded procedural sleeves now.
+    offers = (opts.stockAdapter && opts.stockAdapter(opts.shop, 'sleeve')) || proceduralSleeves(opts.seed ?? 1, count);
+    curLbl.textContent = (opts.shopName ? opts.shopName + ' — ' : '');
+    [hint, curLbl, outBtn].forEach(e => e.style.display = 'block');
+    buildStack(offers);
+    if (opts.shopName) curLbl.textContent = opts.shopName + ' — ' + curLbl.textContent;
+  }
+
+  function freeOpen() {   // free per-open GPU resources → each open/close is leak-free
+    recs.forEach(r => scene.remove(r.group)); recs = [];
+    if (crate) { scene.remove(crate); crate = null; }
+    for (const g of oGeo) g.dispose(); for (const m of oMat) m.dispose(); for (const t of oTex) t.dispose();
+    oGeo.clear(); oMat.clear(); oTex.clear();
+  }
+
+  function close() {
+    if (!active) return;
+    active = false; pulled = null;
+    [hint, curLbl, panel, outBtn, toast].forEach(e => e.style.display = 'none');
+    freeOpen();
+    const cb = onCloseCb; onCloseCb = null;
+    if (cb) cb();
+  }
+
+  // full teardown — frees the persistent GPU resources + removes listeners/DOM (call when the shell
+  // is done with the dig, e.g. leaving interior mode entirely).
+  function dispose() {
+    close();
+    removeEventListener('resize', onResize);
+    renderer.domElement.removeEventListener('wheel', onWheel);
+    renderer.domElement.removeEventListener('pointerdown', onDown);
+    renderer.domElement.removeEventListener('pointermove', onMove);
+    renderer.domElement.removeEventListener('pointerup', onUp);
+    document.removeEventListener('keydown', onKey, true);
+    for (const g of pGeo) g.dispose(); for (const m of pMat) m.dispose(); for (const t of pTex) t.dispose();
+    pGeo.clear(); pMat.clear(); pTex.clear();
+    [css, hint, curLbl, panel, outBtn, toast].forEach(e => e.remove());
+  }
+
+  return { scene, camera, open, close, update, dispose, get active() { return active; } };
+}
+
+// A stable per-bin seed from the shop + a bin index, so a given bin riffles the same order every time.
+export function binSeed(shopSeed, binId) {
+  return (xmur3(`dig:${shopSeed}:${binId}`)()) >>> 0;
+}