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init: model claude-fable-5-1, Claude Code 2.1.312, permission mode dontAsk

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[user]
Output token limit hit. Resume directly — no apology, no recap of what you were doing. Pick up mid-thought if that is where the cut happened. Break remaining work into smaller pieces.

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[tool Bash]
{
  "command": "ls -la [workspace] && wc -c [workspace]/index.html 2>/dev/null; tail -c 600 [workspace]/index.html 2>/dev/null",
  "description": "Check for an existing partial index.html"
}

[tool error]
Exit code 1
total 0
drwx------@ 3 [redacted:username]  wheel   96 Oct 28 11:50 .
drwx------@ 5 [redacted:username]  wheel  160 Oct 28 11:35 ..
drwxr-xr-x@ 3 [redacted:username]  wheel   96 Oct 28 11:50 .claude

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[assistant]
No partial file exists, so I'll build `index.html` from scratch in three chunks: markup, CSS and layout first, then physics, then the renderer and main loop.

[tool Write]
{
  "file_path": "[workspace]/index.html",
  "content": "<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1, viewport-fit=cover, user-scalable=no\">\n<meta name=\"theme-color\" content=\"#0c0a14\">\n<title>Lava Lamp</title>\n<style>\n  html, body { margin: 0; padding: 0; height: 100%; overflow: hidden; background: #0c0a14; }\n  body {\n    position: fixed; inset: 0; touch-action: manipulation;\n    -webkit-user-select: none; user-select: none; -webkit-tap-highlight-color: transparent;\n    font-family: system-ui, -apple-system, \"Segoe UI\", Roboto, sans-serif;\n  }\n  canvas { position: absolute; left: 0; top: 0; width: 100%; height: 100%; display: block; }\n  #sw {\n    position: absolute; width: 74px; height: 36px; padding: 0; border: 0; border-radius: 18px;\n    background: linear-gradient(#232328, #1a1a1f);\n    box-shadow: inset 0 2px 5px rgba(0,0,0,.85), 0 1px 0 rgba(255,255,255,.08), 0 8px 16px rgba(0,0,0,.55);\n    cursor: pointer; transform: translate(-50%,-50%); outline: none; touch-action: manipulation;\n  }\n  #sw:focus-visible { box-shadow: inset 0 2px 5px rgba(0,0,0,.85), 0 0 0 3px rgba(255,180,80,.7); }\n  #sw .knob {\n    position: absolute; top: 4px; left: 4px; width: 28px; height: 28px; border-radius: 14px;\n    background: linear-gradient(#8a8a92, #4a4a52); box-shadow: 0 2px 4px rgba(0,0,0,.7), inset 0 1px 0 rgba(255,255,255,.35);\n    transition: left .16s ease-out;\n  }\n  #sw .knob::after {\n    content: \"\"; position: absolute; left: 10px; top: 10px; width: 8px; height: 8px; border-radius: 50%;\n    background: #2a1410; transition: background .25s, box-shadow .25s;\n  }\n  #sw[aria-pressed=\"true\"] .knob { left: 42px; }\n  #sw[aria-pressed=\"true\"] .knob::after { background: #ffb347; box-shadow: 0 0 8px 2px rgba(255,150,50,.9); }\n  #sw .label {\n    position: absolute; left: 50%; top: 100%; transform: translateX(-50%); margin-top: 9px;\n    font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: rgba(255,255,255,.42);\n    white-space: nowrap; pointer-events: none;\n  }\n</style>\n</head>\n<body>\n<canvas id=\"c\"></canvas>\n<button id=\"sw\" type=\"button\" aria-pressed=\"true\" aria-label=\"Lamp power switch\">\n  <span class=\"knob\"></span><span class=\"label\">Lamp on</span>\n</button>\n<script>\n'use strict';\n// ---------- constants (physics works in normalized units: liquid height = 1) ----------\nconst HWB = 0.25;        // glass half-width at the bottom of the liquid\nconst HWT = 0.135;       // glass half-width at the top (dome radius)\nconst THR = 0.5625;      // metaball threshold: an isolated blob renders exactly at its radius\nconst EDGE = 0.07;       // anti-aliasing band in field units\nconst MAX_BLOBS = 12;\n\nconst cv = document.getElementById('c');\nconst ctx = cv.getContext('2d', { alpha: false });\nconst sw = document.getElementById('sw');\nconst swLabel = sw.querySelector('.label');\n\nlet DPR = 1, VW = 0, VH = 0;\nconst L = {};                 // layout in CSS px\nlet bgL, fgL, fgLitL;         // cached layers\nlet fieldCv, fieldCtx, fieldImg, fieldPix, F, FT, FW = 0, FH = 0;\nlet gradGlowWall, gradGlowDesk, gradLiqOff, gradLiqOn, gradBulb;\n\nfunction mkLayer() {\n  const o = document.createElement('canvas');\n  o.width = cv.width; o.height = cv.height;\n  const g = o.getContext('2d');\n  g.setTransform(DPR, 0, 0, DPR, 0, 0);\n  return { c: o, g };\n}\n\n// half-width of the glass interior at normalized height y (0 = bottom, 1 = top of dome)\nfunction hwAt(y) {\n  const yd = 1 - HWT;                                   // where the dome begins\n  if (y <= yd) return HWB + (HWT - HWB) * (y / yd);\n  const d = y - yd;\n  return Math.sqrt(Math.max(0, HWT * HWT - d * d));\n}\n\nfunction glassPath(g, inset) {\n  const { cx, glassTop, glassBot, hwB, hwT } = L;\n  const r = hwT - inset;\n  g.beginPath();\n  g.moveTo(cx - hwB + inset, glassBot);\n  g.lineTo(cx - hwT + inset, glassTop + hwT);\n  g.arc(cx, glassTop + hwT, r, Math.PI, 0);\n  g.lineTo(cx + hwB - inset, glassBot);\n  g.closePath();\n}\n\nfunction layout() {\n  VW = window.innerWidth; VH = window.innerHeight;\n  DPR = Math.min(2, window.devicePixelRatio || 1);\n  cv.width = Math.round(VW * DPR); cv.height = Math.round(VH * DPR);\n  ctx.setTransform(DPR, 0, 0, DPR, 0, 0);\n\n  const deskY = VH - Math.min(170, Math.max(90, VH * 0.16));\n  const Hl = Math.min(deskY - 24, VW * 1.4);\n  const cx = VW / 2;\n  const bH = 0.30 * Hl, baseTop = deskY - bH;\n  const H = 0.62 * Hl;                                  // liquid height in px\n  Object.assign(L, {\n    Hl, cx, deskY, frontY: deskY + (VH - deskY) * 0.62,\n    bH, baseTop, baseHwB: 0.21 * Hl, baseHwT: 0.165 * Hl,\n    H, glassTop: baseTop - H, glassBot: baseTop + 0.05 * Hl,\n    hwB: HWB * H, hwT: HWT * H,\n    swX: cx + 0.115 * Hl, swY: 0,\n  });\n  L.swY = (deskY + L.frontY) / 2 + 2;\n  sw.style.left = L.swX + 'px'; sw.style.top = L.swY + 'px';\n\n  // metaball field grid: ~2 css px per cell, capped\n  let cell = 2;\n  while ((2 * HWB * H / cell) * (H / cell) > 36000) cell += 0.5;\n  L.cell = cell;\n  FH = Math.max(8, Math.round(H / cell));\n  FW = Math.max(8, Math.round(2 * HWB * H / cell));\n  fieldCv = document.createElement('canvas'); fieldCv.width = FW; fieldCv.height = FH;\n  fieldCtx = fieldCv.getContext('2d');\n  fieldImg = fieldCtx.createImageData(FW, FH);\n  fieldPix = new Uint32Array(fieldImg.data.buffer);\n  F = new Float32Array(FW * FH); FT = new Float32Array(FW * FH);\n\n  bgL = mkLayer(); drawBg(bgL.g);\n  fgL = mkLayer(); drawFg(fgL.g);\n  fgLitL = mkLayer(); drawFgLit(fgLitL.g);\n  makeGradients();\n}\n\nfunction makeGradients() {\n  const { cx, glassTop, baseTop, deskY, Hl, hwB, H } = L;\n  const gy = glassTop + H * 0.55;\n  gradGlowWall = ctx.createRadialGradient(cx, gy, Hl * 0.05, cx, gy, Hl * 1.25);\n  gradGlowWall.addColorStop(0, 'rgba(150,90,255,0.42)');\n  gradGlowWall.addColorStop(0.35, 'rgba(110,60,220,0.18)');\n  gradGlowWall.addColorStop(1, 'rgba(60,30,120,0)');\n  gradGlowDesk = ctx.createRadialGradient(cx, deskY, 0, cx, deskY, Hl * 0.55);\n  gradGlowDesk.addColorStop(0, 'rgba(255,160,70,0.45)');\n  gradGlowDesk.addColorStop(0.5, 'rgba(255,120,60,0.15)');\n  gradGlowDesk.addColorStop(1, 'rgba(255,100,50,0)');\n  gradLiqOff = ctx.createLinearGradient(0, glassTop, 0, baseTop);\n  gradLiqOff.addColorStop(0, '#07060f'); gradLiqOff.addColorStop(1, '#100c22');\n  gradLiqOn = ctx.createLinearGradient(0, glassTop, 0, baseTop);\n  gradLiqOn.addColorStop(0, '#1b1450'); gradLiqOn.addColorStop(0.45, '#2a1f80');\n  gradLiqOn.addColorStop(0.8, '#4a37c0'); gradLiqOn.addColorStop(1, '#7a62ff');\n  gradBulb = ctx.createRadialGradient(cx, baseTop, 0, cx, baseTop, hwB * 1.3);\n  gradBulb.addColorStop(0, 'rgba(255,220,160,0.85)');\n  gradBulb.addColorStop(0.4, 'rgba(255,170,110,0.35)');\n  gradBulb.addColorStop(1, 'rgba(255,140,90,0)');\n}\n//__NEXT__\n</script>\n</body>\n</html>\n"
}

[tool result]
File created successfully at: [workspace]/index.html (file state is current in your context — no need to Read it back)

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[assistant]
Now the cached static layers: wall, desk, cord, brass base, cap and glass highlights.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "//__NEXT__",
  "new_string": "// ---------- static layers ----------\nfunction drawBg(g) {\n  const { cx, deskY, frontY, deskYd = deskY, Hl, baseHwB, swX, swY } = L;\n  let gr = g.createLinearGradient(0, 0, 0, deskY);\n  gr.addColorStop(0, '#100e1b'); gr.addColorStop(1, '#1e1a30');\n  g.fillStyle = gr; g.fillRect(0, 0, VW, deskY);\n  // skirting line where wall meets desk\n  g.fillStyle = 'rgba(0,0,0,0.35)'; g.fillRect(0, deskY - 2, VW, 2);\n  // desk surface\n  gr = g.createLinearGradient(0, deskY, 0, frontY);\n  gr.addColorStop(0, '#3e2a1a'); gr.addColorStop(1, '#6b4728');\n  g.fillStyle = gr; g.fillRect(0, deskY, VW, frontY - deskY);\n  // wood grain\n  g.strokeStyle = 'rgba(0,0,0,0.12)'; g.lineWidth = 1;\n  for (let i = 0; i < 14; i++) {\n    const y = deskY + (frontY - deskY) * (i + 0.5) / 14;\n    g.beginPath();\n    for (let x = 0; x <= VW; x += 24) g.lineTo(x, y + Math.sin(x * 0.03 + i * 1.7) * 1.2);\n    g.stroke();\n  }\n  // desk front edge and face\n  gr = g.createLinearGradient(0, frontY, 0, VH);\n  gr.addColorStop(0, '#2a1a0f'); gr.addColorStop(0.08, '#4a2f1b'); gr.addColorStop(1, '#1a100a');\n  g.fillStyle = gr; g.fillRect(0, frontY, VW, VH - frontY);\n  g.fillStyle = 'rgba(255,220,180,0.18)'; g.fillRect(0, frontY, VW, 1.5);\n  // lamp shadow on the desk\n  gr = g.createRadialGradient(cx, deskY + 6, 0, cx, deskY + 6, baseHwB * 1.6);\n  gr.addColorStop(0, 'rgba(0,0,0,0.55)'); gr.addColorStop(1, 'rgba(0,0,0,0)');\n  g.save(); g.translate(cx, deskY + 6); g.scale(1, 0.28); g.translate(-cx, -(deskY + 6));\n  g.fillStyle = gr; g.fillRect(cx - baseHwB * 2, deskY - baseHwB * 2, baseHwB * 4, baseHwB * 4);\n  g.restore();\n  // cord from the base to the switch\n  g.strokeStyle = '#141416'; g.lineWidth = Math.max(2, Hl * 0.008); g.lineCap = 'round';\n  g.beginPath();\n  g.moveTo(cx + baseHwB * 0.75, deskY - 2);\n  g.bezierCurveTo(cx + baseHwB * 1.1, deskY + 8, swX - 60, swY + 6, swX - 34, swY);\n  g.stroke();\n  g.beginPath();\n  g.moveTo(swX + 34, swY);\n  g.bezierCurveTo(swX + 70, swY - 2, VW * 0.9, swY + 10, VW + 10, swY - 6);\n  g.stroke();\n}\n\nfunction brassGradient(g, x0, x1) {\n  const gr = g.createLinearGradient(x0, 0, x1, 0);\n  gr.addColorStop(0, '#2a1d0a'); gr.addColorStop(0.16, '#7d5f22'); gr.addColorStop(0.34, '#d7b057');\n  gr.addColorStop(0.47, '#f3da85'); gr.addColorStop(0.62, '#c59a44'); gr.addColorStop(0.82, '#5e4316');\n  gr.addColorStop(1, '#1e1506');\n  return gr;\n}\n\nfunction drawFg(g) {\n  const { cx, deskY, baseTop, baseHwB, baseHwT, glassTop, glassBot, hwB, hwT, Hl, H } = L;\n  // glass highlights and shading (clipped to the glass)\n  g.save(); glassPath(g, 0); g.clip();\n  let gr = g.createLinearGradient(cx - hwB, 0, cx + hwB, 0);\n  gr.addColorStop(0, 'rgba(0,0,0,0.5)'); gr.addColorStop(0.12, 'rgba(0,0,0,0.12)');\n  gr.addColorStop(0.3, 'rgba(255,255,255,0)'); gr.addColorStop(0.78, 'rgba(255,255,255,0)');\n  gr.addColorStop(0.9, 'rgba(0,0,0,0.18)'); gr.addColorStop(1, 'rgba(0,0,0,0.55)');\n  g.fillStyle = gr; g.fillRect(cx - hwB, glassTop, hwB * 2, glassBot - glassTop);\n  gr = g.createLinearGradient(cx - hwB * 0.86, 0, cx - hwB * 0.3, 0);\n  gr.addColorStop(0, 'rgba(255,255,255,0)'); gr.addColorStop(0.35, 'rgba(255,255,255,0.22)');\n  gr.addColorStop(0.6, 'rgba(255,255,255,0.1)'); gr.addColorStop(1, 'rgba(255,255,255,0)');\n  g.fillStyle = gr; g.fillRect(cx - hwB, glassTop, hwB, glassBot - glassTop);\n  gr = g.createLinearGradient(cx + hwB * 0.45, 0, cx + hwB * 0.8, 0);\n  gr.addColorStop(0, 'rgba(255,255,255,0)'); gr.addColorStop(0.5, 'rgba(255,255,255,0.09)');\n  gr.addColorStop(1, 'rgba(255,255,255,0)');\n  g.fillStyle = gr; g.fillRect(cx, glassTop, hwB, glassBot - glassTop);\n  // dome gloss\n  gr = g.createRadialGradient(cx - hwT * 0.35, glassTop + hwT * 0.55, 0, cx - hwT * 0.35, glassTop + hwT * 0.55, hwT * 1.1);\n  gr.addColorStop(0, 'rgba(255,255,255,0.28)'); gr.addColorStop(1, 'rgba(255,255,255,0)');\n  g.fillStyle = gr; g.fillRect(cx - hwT * 2, glassTop, hwT * 4, hwT * 2);\n  g.restore();\n  glassPath(g, 0); g.strokeStyle = 'rgba(255,255,255,0.28)'; g.lineWidth = 1.5; g.stroke();\n\n  // base body\n  g.beginPath();\n  g.moveTo(cx - baseHwT, baseTop); g.lineTo(cx + baseHwT, baseTop);\n  g.lineTo(cx + baseHwB, deskY); g.lineTo(cx - baseHwB, deskY); g.closePath();\n  g.fillStyle = brassGradient(g, cx - baseHwB, cx + baseHwB); g.fill();\n  gr = g.createLinearGradient(0, baseTop, 0, deskY);\n  gr.addColorStop(0, 'rgba(255,240,200,0.12)'); gr.addColorStop(0.5, 'rgba(0,0,0,0)'); gr.addColorStop(1, 'rgba(0,0,0,0.45)');\n  g.fillStyle = gr; g.fill();\n  // base rim (cup lip) that holds the glass\n  const ry = baseHwT * 0.14;\n  g.beginPath(); g.ellipse(cx, baseTop, baseHwT, ry, 0, 0, Math.PI * 2);\n  g.fillStyle = brassGradient(g, cx - baseHwT, cx + baseHwT); g.fill();\n  g.strokeStyle = 'rgba(0,0,0,0.5)'; g.lineWidth = 1; g.stroke();\n  g.beginPath(); g.ellipse(cx, baseTop, hwB * 1.02, ry * 0.75, 0, 0, Math.PI, true);\n  g.strokeStyle = 'rgba(0,0,0,0.6)'; g.lineWidth = 2; g.stroke();\n  // base foot\n  g.fillStyle = 'rgba(0,0,0,0.5)'; g.fillRect(cx - baseHwB, deskY - 3, baseHwB * 2, 3);\n\n  // cap on top of the dome\n  const capB = glassTop + hwT * 0.3, capT = glassTop - Hl * 0.065;\n  const capHwB = hwT * 0.92, capHwT = hwT * 0.5;\n  g.beginPath();\n  g.moveTo(cx - capHwB, capB); g.lineTo(cx - capHwT, capT); g.lineTo(cx + capHwT, capT); g.lineTo(cx + capHwB, capB); g.closePath();\n  g.fillStyle = brassGradient(g, cx - capHwB, cx + capHwB); g.fill();\n  g.beginPath(); g.ellipse(cx, capT, capHwT, capHwT * 0.2, 0, 0, Math.PI * 2);\n  g.fillStyle = '#e9cf7c'; g.fill(); g.strokeStyle = 'rgba(0,0,0,0.4)'; g.stroke();\n  g.beginPath(); g.ellipse(cx, capB, capHwB, capHwB * 0.2, 0, 0, Math.PI);\n  g.strokeStyle = 'rgba(0,0,0,0.45)'; g.lineWidth = 1.5; g.stroke();\n}\n\nfunction drawFgLit(g) {\n  const { cx, baseTop, baseHwT, glassTop, hwB, hwT, Hl } = L;\n  // warm spill of the bulb on the base lip\n  let gr = g.createRadialGradient(cx, baseTop, 0, cx, baseTop, baseHwT * 1.1);\n  gr.addColorStop(0, 'rgba(255,190,110,0.7)'); gr.addColorStop(0.6, 'rgba(255,150,80,0.2)'); gr.addColorStop(1, 'rgba(255,140,80,0)');\n  g.save(); g.translate(cx, baseTop); g.scale(1, 0.25); g.translate(-cx, -baseTop);\n  g.fillStyle = gr; g.fillRect(cx - baseHwT * 1.2, baseTop - baseHwT * 1.2, baseHwT * 2.4, baseHwT * 2.4);\n  g.restore();\n  // glass rim catches the light\n  g.save(); glassPath(g, 0); g.clip();\n  gr = g.createLinearGradient(0, baseTop - Hl * 0.08, 0, baseTop);\n  gr.addColorStop(0, 'rgba(255,200,140,0)'); gr.addColorStop(1, 'rgba(255,200,140,0.5)');\n  g.fillStyle = gr; g.fillRect(cx - hwB, baseTop - Hl * 0.08, hwB * 2, Hl * 0.08);\n  g.restore();\n  // violet glint on the cap\n  gr = g.createRadialGradient(cx, glassTop, 0, cx, glassTop, hwT * 1.4);\n  gr.addColorStop(0, 'rgba(170,120,255,0.35)'); gr.addColorStop(1, 'rgba(170,120,255,0)');\n  g.fillStyle = gr; g.fillRect(cx - hwT * 2, glassTop - hwT * 2, hwT * 4, hwT * 4);\n}\n//__NEXT__"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

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[assistant]
Physics next: heating, buoyancy, drag, wall collisions, pool emission/absorption, merging and splitting. I'm also cleaning up a stray destructuring default I left in the background drawer.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  const { cx, deskY, frontY, deskYd = deskY, Hl, baseHwB, swX, swY } = L;",
  "new_string": "  const { cx, deskY, frontY, Hl, baseHwB, swX, swY } = L;"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "//__NEXT__",
  "new_string": "// ---------- physics ----------\nconst blobs = [];\nlet on = true, light = 1, simTime = 0;\nconst pool = { mass: 0.078, T: 0.6 };       // molten wax pool hidden in the base cup\nconst GRAV = 0.5, TN = 0.5, CD = 0.1, HK = 0.6, CK = 0.12;\nconst R_SPLIT = 0.095;\nconst clamp01 = v => v < 0 ? 0 : v > 1 ? 1 : v;\nfunction poolTop() { return Math.max(0.015, pool.mass / (2 * HWB)); }\n\nfunction spawnFromPool() {\n  const r = 0.055 + Math.random() * 0.04, m = r * r;\n  if (pool.mass - m < 0.006) return;\n  pool.mass -= m;\n  blobs.push({ x: (Math.random() - 0.5) * HWB * 0.9, y: poolTop() + r * 0.75, vx: 0, vy: 0.04,\n               r, m, T: 0.85, noMerge: 0, ph: Math.random() * 6.283 });\n}\n\nfunction absorb(i) {\n  const b = blobs[i];\n  pool.T = (pool.T * pool.mass + b.T * b.m) / (pool.mass + b.m);\n  pool.mass += b.m;\n  blobs.splice(i, 1);\n}\n\nfunction mergeBlobs(a, b) {\n  const m = a.m + b.m;\n  return { x: (a.x * a.m + b.x * b.m) / m, y: (a.y * a.m + b.y * b.m) / m,\n           vx: (a.vx * a.m + b.vx * b.m) / m, vy: (a.vy * a.m + b.vy * b.m) / m,\n           r: Math.sqrt(m), m, T: (a.T * a.m + b.T * b.m) / m, noMerge: 0, ph: a.ph };\n}\n\nfunction splitBlob(b) {\n  const f = 0.32 + Math.random() * 0.2;\n  const mA = b.m * (1 - f), mB = b.m * f, rA = Math.sqrt(mA), rB = Math.sqrt(mB);\n  let dx = 0, dy = 1;\n  const sp = Math.hypot(b.vx, b.vy);\n  if (sp > 0.02) { dx = b.vx / sp; dy = b.vy / sp; }\n  const sep = (rA + rB) * 0.6, lat = (Math.random() - 0.5) * 0.06;\n  const A = { x: b.x + dx * sep * mB / b.m, y: b.y + dy * sep * mB / b.m, vx: b.vx + dx * 0.02 + lat, vy: b.vy + dy * 0.02,\n              r: rA, m: mA, T: clamp01(b.T + 0.07 * dy), noMerge: 2.5, ph: b.ph };\n  const B = { x: b.x - dx * sep * mA / b.m, y: b.y - dy * sep * mA / b.m, vx: b.vx - dx * 0.02 - lat, vy: b.vy - dy * 0.02,\n              r: rB, m: mB, T: clamp01(b.T - 0.07 * dy), noMerge: 2.5, ph: Math.random() * 6.283 };\n  return [A, B];\n}\n\nfunction step(dt) {\n  simTime += dt;\n  light = clamp01(light + (on ? dt / 1.6 : -dt / 2.4));\n\n  pool.T += (light * 0.3 * (1 - pool.T) - 0.04 * pool.T) * dt;\n  if (pool.T > 0.62 && blobs.length < MAX_BLOBS && Math.random() < 0.6 * dt) { spawnFromPool(); pool.T -= 0.18; }\n  const pt = poolTop();\n\n  for (const b of blobs) {\n    const hz = Math.max(0, 1 - b.y / 0.3);                 // heat zone above the bulb\n    const rate = Math.pow(0.08 / b.r, 0.7);                 // small blobs change temperature faster\n    b.T = clamp01(b.T + (light * HK * hz * (1 - b.T) - CK * (0.3 + b.y) * b.T) * rate * dt);\n    let ax = 0.02 * Math.sin(simTime * 0.6 + b.ph) + 0.015 * Math.sin(simTime * 1.7 + b.ph * 2);\n    let ay = GRAV * (b.T - TN);\n    ax -= b.vx * CD / b.r; ay -= b.vy * CD / b.r;\n    b.vx += ax * dt; b.vy += ay * dt;\n    b.x += b.vx * dt; b.y += b.vy * dt;\n\n    const top = 1 - b.r - 0.015;\n    if (b.y > top) { b.y = top; if (b.vy > 0) b.vy *= -0.2; }\n    const floor = pt - b.r * 0.4;\n    if (b.y < floor) { b.y = floor; if (b.vy < 0) b.vy *= -0.2; }\n    const hw = hwAt(b.y) - b.r - 0.005;\n    if (hw <= 0) { b.x += (0 - b.x) * Math.min(1, 5 * dt); b.vx *= 0.9; }\n    else if (b.x > hw) { b.x = hw; if (b.vx > 0) b.vx *= -0.2; }\n    else if (b.x < -hw) { b.x = -hw; if (b.vx < 0) b.vx *= -0.2; }\n    if (b.noMerge > 0) b.noMerge -= dt;\n  }\n\n  // sinking blobs that touch the pool rejoin it\n  for (let i = blobs.length - 1; i >= 0; i--) {\n    const b = blobs[i];\n    if (b.vy <= 0 && b.T < 0.6 && b.y - b.r * 0.6 < pt) absorb(i);\n  }\n\n  // merge on contact; freshly split halves push apart instead\n  for (let i = 0; i < blobs.length; i++) {\n    for (let j = i + 1; j < blobs.length; j++) {\n      const a = blobs[i], b = blobs[j];\n      const dx = b.x - a.x, dy = b.y - a.y, d = Math.hypot(dx, dy), rs = a.r + b.r;\n      if (d < 1e-5) continue;\n      if (a.noMerge > 0 || b.noMerge > 0) {\n        if (d < rs * 1.05) {\n          const p = (rs * 1.05 - d) * 3 * dt / d, ma = b.m / (a.m + b.m), mb = a.m / (a.m + b.m);\n          a.x -= dx * p * ma; a.y -= dy * p * ma; b.x += dx * p * mb; b.y += dy * p * mb;\n        }\n      } else if (d < rs * 0.78) {\n        blobs[i] = mergeBlobs(a, b); blobs.splice(j, 1); j--;\n      }\n    }\n  }\n\n  // big blobs pinch off\n  for (let i = blobs.length - 1; i >= 0 && blobs.length < MAX_BLOBS; i--) {\n    const b = blobs[i];\n    if (b.r > R_SPLIT && Math.random() < 0.35 * (b.r / R_SPLIT) * (b.r / R_SPLIT) * dt) {\n      const [A, B] = splitBlob(b);\n      blobs[i] = A; blobs.push(B);\n    }\n  }\n}\n\nfunction setOn(v) {\n  on = v;\n  sw.setAttribute('aria-pressed', String(v));\n  swLabel.textContent = v ? 'Lamp on' : 'Lamp off';\n}\nsw.addEventListener('click', () => setOn(!on));\n//__NEXT__"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

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[assistant]
Final chunk: metaball field accumulation, per-cell shading, the frame loop, pre-simulation and resize handling.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "//__NEXT__",
  "new_string": "// ---------- wax rendering (metaball field on a small grid) ----------\nfunction computeField() {\n  F.fill(0); FT.fill(0);\n  const cxF = FW / 2, pt = poolTop(), SP = 22, bulgeMax = 0.025;\n  const yStart = Math.max(0, Math.floor((1 - (pt + bulgeMax + THR / SP)) * FH));\n  for (let gy = yStart; gy < FH; gy++) {\n    const yn = 1 - (gy + 0.5) / FH;\n    for (let gx = 0; gx < FW; gx++) {\n      const xn = (gx + 0.5 - cxF) / FH;\n      const v = THR + (pt + bulgeMax * (1 - xn * xn / (HWB * HWB)) - yn) * SP;\n      if (v > 0) { const i = gy * FW + gx; F[i] += v; FT[i] += v * pool.T; }\n    }\n  }\n  for (let n = 0; n < blobs.length; n++) {\n    const b = blobs[n];\n    const bx = cxF + b.x * FH, by = (1 - b.y) * FH, R = b.r * FH * 2, R2 = R * R;\n    const x0 = Math.max(0, Math.floor(bx - R)), x1 = Math.min(FW - 1, Math.ceil(bx + R));\n    const y0 = Math.max(0, Math.floor(by - R)), y1 = Math.min(FH - 1, Math.ceil(by + R));\n    for (let gy = y0; gy <= y1; gy++) {\n      const dy = gy + 0.5 - by, dy2 = dy * dy;\n      let i = gy * FW + x0;\n      for (let gx = x0; gx <= x1; gx++, i++) {\n        const dx = gx + 0.5 - bx, q = (dx * dx + dy2) / R2;\n        if (q < 1) { const k = (1 - q) * (1 - q); F[i] += k; FT[i] += k * b.T; }\n      }\n    }\n  }\n}\n\nfunction paintField() {\n  const lo = THR - EDGE, invE = 255 / EDGE, lt = light;\n  const keyAmt = 0.22 * (0.35 + 0.65 * lt), specAmt = 0.6 * (0.3 + 0.7 * lt);\n  for (let gy = 0; gy < FH; gy++) {\n    const rowFrac = gy / FH, bulb = lt * (0.2 + 0.8 * rowFrac * rowFrac);\n    const inY = gy > 0 && gy < FH - 1;\n    for (let gx = 0; gx < FW; gx++) {\n      const i = gy * FW + gx, f = F[i];\n      if (f < lo) { fieldPix[i] = 0; continue; }\n      const a = f - lo >= EDGE ? 255 : ((f - lo) * invE) | 0;\n      const t = FT[i] / f;\n      const dfx = (gx > 0 && gx < FW - 1) ? F[i + 1] - F[i - 1] : 0;\n      const dfy = inY ? F[i + FW] - F[i - FW] : 0;\n      const gl = Math.sqrt(dfx * dfx + dfy * dfy) + 1e-6;\n      const nx = -dfx / gl, ny = -dfy / gl;              // outward normal, screen coords\n      const kd = nx * -0.45 - ny * 0.6;                   // room light from upper left\n      const inside = Math.min(1, (f - THR) * 1.6);\n      let shade = 0.5 + 0.22 * inside + keyAmt * (kd > 0 ? kd : 0) + bulb * (0.3 + 0.45 * (ny > 0 ? ny : 0));\n      let sp = kd - 0.62; sp = sp > 0 ? sp * sp * 6.6 * specAmt : 0;\n      // wax colour: cool red -> hot orange-yellow, darkened when the lamp is off\n      let r = 210 + 45 * t, g = 55 + 120 * t, b = 35 + 10 * t;\n      r = 58 + (r - 58) * lt; g = 20 + (g - 20) * lt; b = 16 + (b - 16) * lt;\n      r = r * shade + 255 * sp; g = g * shade + 255 * sp; b = b * shade + 255 * sp;\n      fieldPix[i] = (a << 24) | ((b > 255 ? 255 : b) << 16) | ((g > 255 ? 255 : g) << 8) | (r > 255 ? 255 : r);\n    }\n  }\n}\n\n// ---------- frame loop ----------\nfunction render() {\n  const { cx, glassTop, glassBot, baseTop, hwB, H, deskY } = L;\n  ctx.drawImage(bgL.c, 0, 0, VW, VH);\n  if (light > 0.002) {\n    ctx.globalAlpha = light;\n    ctx.fillStyle = gradGlowWall; ctx.fillRect(0, 0, VW, VH);\n    ctx.fillStyle = gradGlowDesk; ctx.fillRect(0, deskY, VW, VH - deskY);\n    ctx.globalAlpha = 1;\n  }\n  ctx.save(); glassPath(ctx, 0); ctx.clip();\n  ctx.fillStyle = gradLiqOff; ctx.fillRect(cx - hwB, glassTop, hwB * 2, glassBot - glassTop);\n  if (light > 0.002) {\n    ctx.globalAlpha = light;\n    ctx.fillStyle = gradLiqOn; ctx.fillRect(cx - hwB, glassTop, hwB * 2, glassBot - glassTop);\n    ctx.fillStyle = gradBulb; ctx.fillRect(cx - hwB, baseTop - hwB * 1.3, hwB * 2, hwB * 1.3 + 6);\n    ctx.globalAlpha = 1;\n  }\n  computeField(); paintField();\n  fieldCtx.putImageData(fieldImg, 0, 0);\n  ctx.drawImage(fieldCv, 0, 0, FW, FH, cx - hwB, glassTop, hwB * 2, H);\n  ctx.restore();\n  ctx.drawImage(fgL.c, 0, 0, VW, VH);\n  if (light > 0.002) {\n    ctx.globalAlpha = light; ctx.drawImage(fgLitL.c, 0, 0, VW, VH); ctx.globalAlpha = 1;\n  }\n}\n\nlet last = 0;\nfunction frame(now) {\n  requestAnimationFrame(frame);\n  const dt = last ? Math.min(0.05, (now - last) / 1000) : 1 / 60;\n  last = now;\n  step(dt * 0.5); step(dt * 0.5);\n  render();\n}\n\nlet resizeTimer = 0;\nfunction onResize() { clearTimeout(resizeTimer); resizeTimer = setTimeout(layout, 60); }\nwindow.addEventListener('resize', onResize);\nif (window.visualViewport) window.visualViewport.addEventListener('resize', onResize);\n\nlayout();\nsetOn(true);\nfor (let i = 0; i < 1500; i++) step(1 / 60);   // warm the lamp up so blobs are already moving\nrequestAnimationFrame(frame);"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

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[tool Bash]
{
  "command": "sed -n '/<script>/,/<\\/script>/p' index.html | sed '1d;$d' > \"$TMPDIR/lava.js\" && node --check \"$TMPDIR/lava.js\" && echo SYNTAX_OK; wc -c index.html; grep -nE 'https?://|src=|href=|@import|url\\(' index.html || echo NO_EXTERNAL_REFS",
  "description": "Syntax-check the inline script and scan for external references"
}

[tool error]
Exit code 1
(eval):1: operation not permitted: [redacted:local-path]
   22636 index.html
NO_EXTERNAL_REFS
zsh:1: operation not permitted: [redacted:local-path]

[tool Bash]
{
  "command": "node --version; ls \"/Applications/Google Chrome.app/Contents/MacOS/\" 2>/dev/null; ls /Applications | grep -iE 'chrom|firefox|safari' ; which chromium chrome google-chrome playwright 2>/dev/null; ls ~/.cache/ms-playwright 2>/dev/null | head",
  "description": "Check for node and any headless browser available for rendering tests"
}

[tool error]
Exit code 1
----- Native stack trace -----

 1: 0x107b0230c node::InitializeOncePerProcessInternal(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>> const&, node::ProcessInitializationFlags::Flags) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib]
 2: 0x107b02e78 node::Start(int, char**) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib]
 3: 0x195eebe80 start [/usr/lib/dyld]
Google Chrome
Google Chrome.app
Safari.app
web-eid-safari.app
chromium not found
chrome not found
google-chrome not found
playwright not found
zsh:1: operation not permitted: [redacted:local-path]

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[tool Bash]
{
  "command": "sed -n '/<script>/,/<\\/script>/p' index.html | sed '1d;$d' > lava_check.js && node --check lava_check.js; echo \"node exit=$?\"; rm -f lava_check.js",
  "description": "Syntax-check the inline script with node using the project dir for the temp file"
}

[permission denied]
Bash: Permission to use Bash has been denied because Claude Code is running in don't ask mode. IMPORTANT: You *may* attempt to accomplish this action using other tools that might naturally be used to accomplish this goal, e.g. using head instead of cat. But you *should not* attempt to work around this denial in malicious ways, e.g. do not use your ability to run tests to execute non-test actions. You should only try to work around this restriction in reasonable ways that do not attempt to bypass the intent behind this denial. If you believe this capability is essential to complete the user's request, STOP and explain to the user what you were trying to do and why you need this permission. Let the user decide how to proceed.

[tool error]
Permission to use Bash has been denied because Claude Code is running in don't ask mode. IMPORTANT: You *may* attempt to accomplish this action using other tools that might naturally be used to accomplish this goal, e.g. using head instead of cat. But you *should not* attempt to work around this denial in malicious ways, e.g. do not use your ability to run tests to execute non-test actions. You should only try to work around this restriction in reasonable ways that do not attempt to bypass the intent behind this denial. If you believe this capability is essential to complete the user's request, STOP and explain to the user what you were trying to do and why you need this permission. Let the user decide how to proceed.

[tool Bash]
{
  "command": "mkdir -p .chrome-tmp && timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/profile\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=3000 --screenshot=\"$PWD/.chrome-tmp/phone.png\" \"file://$PWD/index.html\" 2>&1 | tail -5; echo \"chrome exit=$?\"; ls -la .chrome-tmp/phone.png 2>/dev/null",
  "description": "Render the page in headless Chrome at phone size and save a screenshot",
  "timeout": 90000
}

[tool error]
Exit code 1
[1028/120033.693481:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:41] getxattr size org.chromium.crashpad.database.initialized on file [redacted:user-path] Operation not permitted (1)
[1028/120033.693893:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:41] getxattr size com.googlecode.crashpad.initialized on file [redacted:user-path] Operation not permitted (1)
[1028/120033.694052:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:66] setxattr org.chromium.crashpad.database.initialized on file [redacted:user-path] Operation not permitted (1)
[50284:18383336:1028/120033.710397:ERROR:chrome/browser/process_singleton_posix.cc:1046] Failed to create socket directory.
[50284:18383336:1028/120033.711441:ERROR:chrome/app/chrome_main_delegate.cc:624] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption.
chrome exit=0

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[thinking]
I'll set TMPDIR to the project folder since Chrome's single-instance socket needs a writable temp directory, then grab the on-state phone/desktop screenshots, an off-state screenshot, and a frame-time benchmark harness all together.

[tool Bash]
{
  "command": "cd \"$PWD\" && mkdir -p .chrome-tmp/p1 && TMPDIR=\"$PWD/.chrome-tmp\" timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --enable-logging=stderr --v=0 --user-data-dir=\"$PWD/.chrome-tmp/p1\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=4000 --screenshot=\"$PWD/.chrome-tmp/phone.png\" \"file://$PWD/index.html\" 2>&1 | grep -iE 'CONSOLE|error|uncaught' | grep -v -iE 'crashpad|xattr|singleton|socket' | head -10; ls -la .chrome-tmp/phone.png",
  "description": "Render the page headlessly at phone size and capture console errors",
  "timeout": 90000
}

[tool error]
Exit code 1
ls: .chrome-tmp/phone.png: No such file or directory

[tool Bash]
{
  "command": "cd \"$PWD\" && mkdir -p .chrome-tmp/p2 && TMPDIR=\"$PWD/.chrome-tmp\" timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/p2\" --window-size=1280,800 --hide-scrollbars --virtual-time-budget=4000 --screenshot=\"$PWD/.chrome-tmp/desktop.png\" \"file://$PWD/index.html\" >/dev/null 2>&1; ls -la .chrome-tmp/desktop.png",
  "description": "Render the page headlessly at desktop size",
  "timeout": 90000
}

[tool error]
Exit code 1
ls: .chrome-tmp/desktop.png: No such file or directory

[tool Bash]
{
  "command": "cd \"$PWD\" && mkdir -p .chrome-tmp/p3 && sed 's#^requestAnimationFrame(frame);$#setOn(false); light = 0; for (let i = 0; i < 420; i++) step(1 / 60); requestAnimationFrame(frame);#' index.html > .chrome-tmp/off.html && TMPDIR=\"$PWD/.chrome-tmp\" timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/p3\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=500 --screenshot=\"$PWD/.chrome-tmp/off.png\" \"file://$PWD/.chrome-tmp/off.html\" >/dev/null 2>&1; ls -la .chrome-tmp/off.png",
  "description": "Render a variant with the lamp switched off, blobs mid-sink",
  "timeout": 90000
}

[tool error]
Exit code 1
ls: .chrome-tmp/off.png: No such file or directory

[tool Bash]
{
  "command": "cd \"$PWD\" && mkdir -p .chrome-tmp/p4 && sed 's#^requestAnimationFrame(frame);$#const __t0=performance.now();for(let i=0;i<300;i++){step(1/120);step(1/120);render();}const __ms=(performance.now()-__t0)/300;const __t1=performance.now();for(let i=0;i<300;i++){computeField();paintField();}const __fm=(performance.now()-__t1)/300;document.title=\"PERF frame=\"+__ms.toFixed(3)+\"ms field=\"+__fm.toFixed(3)+\"ms cells=\"+(FW*FH)+\" blobs=\"+blobs.length+\" vw=\"+VW+\" vh=\"+VH+\" dpr=\"+DPR;#' index.html > .chrome-tmp/perf.html && TMPDIR=\"$PWD/.chrome-tmp\" timeout 90 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/p4\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=2000 --dump-dom \"file://$PWD/.chrome-tmp/perf.html\" 2>/dev/null | grep -o '<title>[^<]*'",
  "description": "Benchmark per-frame cost of physics, field and render with a dump-dom harness",
  "timeout": 120000
}

[tool result]
(Bash completed with no output)

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[tool Bash]
{
  "command": "cd \"$PWD\" && TMPDIR=\"$PWD/.chrome-tmp\" timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/p1\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=4000 --screenshot=\"$PWD/.chrome-tmp/phone.png\" \"file://$PWD/index.html\" 2>&1 | grep -v -iE 'crashpad|xattr' | tail -25; echo \"exit=${pipestatus[1]}\"",
  "description": "Show full Chrome stderr to diagnose the missing screenshot",
  "timeout": 90000
}

[tool error]
Exit code 1
sandbox_extension_issue_file_to_process failed for /Applications/Google Chrome.app: 1 (Operation not permitted)
[53593:18388585:1028/120126.593645:ERROR:chrome/browser/process_singleton_posix.cc:1046] Failed to create socket directory.
[53593:18388585:1028/120126.593738:ERROR:chrome/app/chrome_main_delegate.cc:624] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption.
exit=21
zsh:1: operation not permitted: [redacted:local-path]

[tool Bash]
{
  "command": "cd \"$PWD\" && ls -la .chrome-tmp/ && which timeout && grep -c 'PERF frame' .chrome-tmp/perf.html && grep -c 'setOn(false); light = 0' .chrome-tmp/off.html",
  "description": "Verify the generated harness files and timeout availability"
}

[tool result]
total 96
drwxr-xr-x@ 9 [redacted:username]  wheel    288 Oct 28 12:01 .
drwx------@ 5 [redacted:username]  wheel    160 Oct 28 12:00 ..
-rw-r--r--@ 1 [redacted:username]  wheel  22705 Oct 28 12:01 off.html
drwxr-xr-x@ 2 [redacted:username]  wheel     64 Oct 28 12:01 p1
drwxr-xr-x@ 2 [redacted:username]  wheel     64 Oct 28 12:01 p2
drwxr-xr-x@ 2 [redacted:username]  wheel     64 Oct 28 12:01 p3
drwxr-xr-x@ 2 [redacted:username]  wheel     64 Oct 28 12:01 p4
-rw-r--r--@ 1 [redacted:username]  wheel  23002 Oct 28 12:01 perf.html
drwx------@ 2 [redacted:username]  wheel     64 Oct 28 12:00 profile
/opt/homebrew/bin/timeout
1
1
zsh:1: operation not permitted: [redacted:local-path]

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[tool Bash]
{
  "command": "ps -axo pid,etime,command | grep -F \"user-data-dir=$PWD/.chrome-tmp\" | grep -v grep | head -5; pkill -f \"user-data-dir=$PWD/.chrome-tmp\" && echo KILLED_STALE || echo NO_STALE",
  "description": "List and stop any stale headless Chrome processes spawned from this session"
}

[permission denied]
Bash: Permission to use Bash has been denied because Claude Code is running in don't ask mode. IMPORTANT: You *may* attempt to accomplish this action using other tools that might naturally be used to accomplish this goal, e.g. using head instead of cat. But you *should not* attempt to work around this denial in malicious ways, e.g. do not use your ability to run tests to execute non-test actions. You should only try to work around this restriction in reasonable ways that do not attempt to bypass the intent behind this denial. If you believe this capability is essential to complete the user's request, STOP and explain to the user what you were trying to do and why you need this permission. Let the user decide how to proceed.

[tool error]
Permission to use Bash has been denied because Claude Code is running in don't ask mode. IMPORTANT: You *may* attempt to accomplish this action using other tools that might naturally be used to accomplish this goal, e.g. using head instead of cat. But you *should not* attempt to work around this denial in malicious ways, e.g. do not use your ability to run tests to execute non-test actions. You should only try to work around this restriction in reasonable ways that do not attempt to bypass the intent behind this denial. If you believe this capability is essential to complete the user's request, STOP and explain to the user what you were trying to do and why you need this permission. Let the user decide how to proceed.

[tool Bash]
{
  "command": "mkdir -p [redacted:local-path] && cd \"$PWD\" && mkdir -p .chrome-tmp/p5 && TMPDIR=[redacted:local-path] timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/p5\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=4000 --screenshot=\"$PWD/.chrome-tmp/phone.png\" \"file://$PWD/index.html\" 2>&1 | grep -v -iE 'crashpad|xattr|sandbox_extension' | tail -8; ls -la .chrome-tmp/phone.png",
  "description": "Retry headless Chrome with a short writable temp dir for its socket",
  "timeout": 90000
}

[tool error]
Exit code 1
mkdir: /tmp: Operation not permitted
ls: .chrome-tmp/phone.png: No such file or directory

[tool Bash]
{
  "command": "JSC=/System/Library/Frameworks/JavaScriptCore.framework/Versions/Current/Helpers/jsc; ls -la \"$JSC\" && \"$JSC\" -e 'print(\"JSC_OK \" + (1+1))'; which bun deno qjs 2>/dev/null; echo \"---node---\"; HOME=\"$PWD\" node -e 'console.log(\"NODE_OK\")' 2>&1 | head -3",
  "description": "Check for JavaScriptCore shell and retry node with HOME overridden"
}

[tool error]
Exit code 1
-rwxr-xr-x  1 root  wheel  393024 Sep 24 10:10 /System/Library/Frameworks/JavaScriptCore.framework/Versions/Current/Helpers/jsc
JSC_OK 2
bun not found
deno not found
qjs not found
---node---
NODE_OK
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
I'll retry the four headless Chrome runs using the dedicated env var for temp-dir lookup on macOS, while also building a node harness with DOM stubs to verify physics invariants, timing, and render the wax field as a PNG.

[tool Write]
{
  "file_path": "[workspace]/.chrome-tmp/harness.js",
  "content": "// Runs the inline script of index.html under node with DOM stubs: checks physics invariants,\n// measures per-frame cost and dumps the wax field as PNGs for visual inspection.\nconst fs = require('fs'), vm = require('vm'), zlib = require('zlib'), path = require('path');\nconst html = fs.readFileSync(path.join(__dirname, '..', 'index.html'), 'utf8');\nconst code = html.slice(html.indexOf('<script>') + 8, html.indexOf('</script>'));\n\nconst gradient = () => ({ addColorStop() {} });\nfunction ctx2d(canvas) {\n  const t = {\n    canvas, globalAlpha: 1, fillStyle: null, strokeStyle: null, lineWidth: 1, lineCap: 'butt', imageSmoothingEnabled: true,\n    createLinearGradient: gradient, createRadialGradient: gradient,\n    createImageData: (w, h) => ({ width: w, height: h, data: new Uint8ClampedArray(w * h * 4) }),\n    putImageData(img) { canvas.lastImage = img; },\n  };\n  return new Proxy(t, { get: (o, k) => (k in o ? o[k] : () => {}), set: (o, k, v) => { o[k] = v; return true; } });\n}\nconst mkCanvas = () => { const c = { width: 0, height: 0 }; c.getContext = () => ctx2d(c); return c; };\nconst canvasEl = mkCanvas(), label = { textContent: '' };\nconst swEl = { attrs: {}, style: {}, handlers: {}, setAttribute(k, v) { this.attrs[k] = v; },\n  addEventListener(ev, fn) { this.handlers[ev] = fn; }, querySelector: () => label };\nconst sandbox = {\n  console, Math, performance, setTimeout, clearTimeout, Float32Array, Uint32Array, Uint8ClampedArray, Object, Number,\n  innerWidth: +process.argv[2] || 390, innerHeight: +process.argv[3] || 844, devicePixelRatio: 2,\n  requestAnimationFrame() {}, addEventListener() {},\n  document: { getElementById: id => (id === 'c' ? canvasEl : swEl), createElement: () => mkCanvas(), hidden: false },\n};\nsandbox.window = sandbox;\nvm.createContext(sandbox);\nconst api = vm.runInContext(code + '\\n;({ step, blobs, pool, poolTop, computeField, paintField, render, setOn, hwAt, L,' +\n  ' getF: () => F, getFW: () => FW, getFH: () => FH, getLight: () => light, getImg: () => fieldImg, HWB, THR });',\n  sandbox, { filename: 'index.html#script' });\n\nconst TOTAL0 = api.pool.mass + api.blobs.reduce((s, b) => s + b.m, 0);\nlet failures = 0;\nfunction check(tag) {\n  let ok = true;\n  const total = api.pool.mass + api.blobs.reduce((s, b) => s + b.m, 0);\n  for (const b of api.blobs) {\n    if (![b.x, b.y, b.vx, b.vy, b.r, b.T].every(Number.isFinite)) { ok = false; console.log(tag, 'NON-FINITE', b); }\n    const hw = api.hwAt(Math.min(b.y, 0.999));\n    if (Math.abs(b.x) > hw + 1e-6 || b.y > 1 || b.y < -0.1) { ok = false; console.log(tag, 'OUT OF BOUNDS', JSON.stringify(b)); }\n  }\n  if (Math.abs(total - TOTAL0) > 1e-9) { ok = false; console.log(tag, 'MASS DRIFT', total, TOTAL0); }\n  if (!Number.isFinite(api.pool.T) || !Number.isFinite(api.pool.mass)) { ok = false; console.log(tag, 'POOL NaN'); }\n  const rs = api.blobs.map(b => b.r);\n  console.log(`${tag.padEnd(14)} blobs=${String(api.blobs.length).padStart(2)} r=[${rs.length ? Math.min(...rs).toFixed(3) + '..' + Math.max(...rs).toFixed(3) : '-'}]` +\n    ` ymax=${rs.length ? Math.max(...api.blobs.map(b => b.y)).toFixed(2) : '-'} poolTop=${api.poolTop().toFixed(3)} poolT=${api.pool.T.toFixed(2)} light=${api.getLight().toFixed(2)} ${ok ? 'ok' : 'FAIL'}`);\n  if (!ok) failures++;\n  return ok;\n}\nfunction run(seconds) { for (let i = 0; i < seconds * 60; i++) { api.step(1 / 120); api.step(1 / 120); } }\n\n// ---- PNG writer ----\nfunction png(w, h, rgba) {\n  const tbl = []; for (let n = 0; n < 256; n++) { let c = n; for (let k = 0; k < 8; k++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1; tbl[n] = c >>> 0; }\n  const crc = buf => { let c = 0xffffffff; for (const b of buf) c = tbl[(c ^ b) & 255] ^ (c >>> 8); return (c ^ 0xffffffff) >>> 0; };\n  const chunk = (type, data) => { const len = Buffer.alloc(4); len.writeUInt32BE(data.length); const td = Buffer.concat([Buffer.from(type), data]); const cr = Buffer.alloc(4); cr.writeUInt32BE(crc(td)); return Buffer.concat([len, td, cr]); };\n  const raw = Buffer.alloc((w * 4 + 1) * h);\n  for (let y = 0; y < h; y++) { raw[y * (w * 4 + 1)] = 0; rgba.copy(raw, y * (w * 4 + 1) + 1, y * w * 4, (y + 1) * w * 4); }\n  const ihdr = Buffer.alloc(13); ihdr.writeUInt32BE(w, 0); ihdr.writeUInt32BE(h, 4); ihdr[8] = 8; ihdr[9] = 6;\n  return Buffer.concat([Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]), chunk('IHDR', ihdr), chunk('IDAT', zlib.deflateSync(raw)), chunk('IEND', Buffer.alloc(0))]);\n}\nfunction dumpField(name) {\n  api.computeField(); api.paintField();\n  const W = api.getFW(), H = api.getFH(), src = api.getImg().data, S = 3, lt = api.getLight();\n  const out = Buffer.alloc(W * S * H * S * 4);\n  for (let y = 0; y < H * S; y++) for (let x = 0; x < W * S; x++) {\n    const i = ((y / S | 0) * W + (x / S | 0)) * 4, a = src[i + 3] / 255, f = y / (H * S);\n    const lr = (10 + (27 + (122 - 27) * f - 10) * lt), lg = (8 + (20 + (98 - 20) * f - 8) * lt), lb = (20 + (80 + (255 - 80) * f - 20) * lt);\n    const o = (y * W * S + x) * 4;\n    out[o] = src[i] * a + lr * (1 - a); out[o + 1] = src[i + 1] * a + lg * (1 - a); out[o + 2] = src[i + 2] * a + lb * (1 - a); out[o + 3] = 255;\n  }\n  fs.writeFileSync(path.join(__dirname, name), png(W * S, H * S, out));\n}\n\nconsole.log(`viewport ${sandbox.innerWidth}x${sandbox.innerHeight} field ${api.getFW()}x${api.getFH()} cells=${api.getFW() * api.getFH()} cell=${api.L.cell}px liquidH=${api.L.H.toFixed(0)}px`);\ncheck('after presim');\nlet maxBlobs = 0, minBlobs = 99;\nfor (let s = 0; s < 12; s++) { run(10); check(`on t=${(s + 1) * 10}s`); maxBlobs = Math.max(maxBlobs, api.blobs.length); minBlobs = Math.min(minBlobs, api.blobs.length); }\nconsole.log(`blob count range while on: ${minBlobs}..${maxBlobs}`);\ndumpField('field_on.png');\napi.setOn(false);\nrun(6); check('off t=6s'); dumpField('field_off.png');\nfor (let s = 0; s < 9; s++) { run(10); check(`off t=${(s + 1) * 10 + 6}s`); }\nconsole.log(`after 96s off: blobs=${api.blobs.length} (expect 0), light=${api.getLight()}`);\nif (api.blobs.length !== 0) failures++;\napi.setOn(true);\nfor (let s = 0; s < 6; s++) { run(10); check(`on again ${(s + 1) * 10}s`); }\nif (api.blobs.length === 0) { failures++; console.log('FAIL: no blobs after re-enabling'); }\n\n// ---- timing ----\nlet t0 = performance.now(); for (let i = 0; i < 400; i++) { api.computeField(); api.paintField(); }\nconst fieldMs = (performance.now() - t0) / 400;\nt0 = performance.now(); for (let i = 0; i < 4000; i++) api.step(1 / 120);\nconst stepMs = (performance.now() - t0) / 4000;\nconsole.log(`timing: field compute+paint ${fieldMs.toFixed(3)} ms, physics step ${stepMs.toFixed(4)} ms (x2 per frame)`);\nconsole.log(failures ? `FAILURES: ${failures}` : 'ALL CHECKS PASSED');\nprocess.exit(failures ? 1 : 0);\n"
}

[tool result]
File created successfully at: [workspace]/.chrome-tmp/harness.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "cd \"$PWD\" && mkdir -p .chrome-tmp/q1 && MAC_CHROMIUM_TMPDIR=\"$PWD/.chrome-tmp\" timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --enable-logging=stderr --v=0 --user-data-dir=\"$PWD/.chrome-tmp/q1\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=4000 --screenshot=\"$PWD/.chrome-tmp/phone.png\" \"file://$PWD/index.html\" 2>&1 | grep -v -iE 'crashpad|xattr|sandbox_extension' | grep -iE 'console|error|uncaught|singleton' | head -8; ls -la .chrome-tmp/phone.png",
  "description": "Headless Chrome phone-size screenshot using Chromium's mac temp-dir override",
  "timeout": 90000
}

[tool error]
Exit code 1
[64247:18405426:1028/120346.505011:ERROR:chrome/browser/process_singleton_posix.cc:1083] Failed to bind() [workspace]/.chrome-tmp/com.google.Chrome.bmkKrC/SingletonSocket: Operation not permitted (1)
[64247:18405426:1028/120346.505408:ERROR:chrome/app/chrome_main_delegate.cc:624] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption.
ls: .chrome-tmp/phone.png: No such file or directory

[tool Bash]
{
  "command": "cd \"$PWD\" && mkdir -p .chrome-tmp/q2 && MAC_CHROMIUM_TMPDIR=\"$PWD/.chrome-tmp\" timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/q2\" --window-size=1280,800 --hide-scrollbars --virtual-time-budget=4000 --screenshot=\"$PWD/.chrome-tmp/desktop.png\" \"file://$PWD/index.html\" >/dev/null 2>&1; ls -la .chrome-tmp/desktop.png",
  "description": "Headless Chrome desktop-size screenshot",
  "timeout": 90000
}

[tool error]
Exit code 1
ls: .chrome-tmp/desktop.png: No such file or directory

[tool Bash]
{
  "command": "cd \"$PWD\" && mkdir -p .chrome-tmp/q3 && MAC_CHROMIUM_TMPDIR=\"$PWD/.chrome-tmp\" timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/q3\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=500 --screenshot=\"$PWD/.chrome-tmp/off.png\" \"file://$PWD/.chrome-tmp/off.html\" >/dev/null 2>&1; ls -la .chrome-tmp/off.png",
  "description": "Headless Chrome screenshot of the switched-off variant",
  "timeout": 90000
}

[tool error]
Exit code 1
ls: .chrome-tmp/off.png: No such file or directory

[tool Bash]
{
  "command": "cd \"$PWD\" && mkdir -p .chrome-tmp/q4 && MAC_CHROMIUM_TMPDIR=\"$PWD/.chrome-tmp\" timeout 90 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=new --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/q4\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=2000 --dump-dom \"file://$PWD/.chrome-tmp/perf.html\" 2>/dev/null | grep -o '<title>[^<]*'",
  "description": "Headless Chrome frame-time benchmark via dump-dom harness",
  "timeout": 120000
}

[tool result]
(Bash completed with no output)

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[thinking]
Chrome launches but the sandbox blocks the singleton socket bind, so headless screenshots won't work here. I'll switch to the node harness for physics checks, timing, and field-image dumps instead.

[tool Bash]
{
  "command": "cd \"$PWD\" && echo \"=== desktop 1280x800 ===\" && HOME=\"$PWD\" node .chrome-tmp/harness.js 1280 800 2>&1 | tail -6; echo; echo \"=== phone 390x844 ===\" && HOME=\"$PWD\" node .chrome-tmp/harness.js 390 844 2>&1; echo \"exit=$?\"; ls -la .chrome-tmp/*.png",
  "description": "Run the node harness at desktop and phone sizes: invariants, timing, field PNG dumps",
  "timeout": 180000
}

[tool error]
Exit code 1
=== desktop 1280x800 ===
on again 30s   blobs= 8 r=[0.060..0.099] ymax=0.56 poolTop=0.066 poolT=0.55 light=1.00 ok
on again 40s   blobs= 5 r=[0.064..0.114] ymax=0.73 poolTop=0.063 poolT=0.82 light=1.00 ok
on again 50s   blobs= 8 r=[0.055..0.130] ymax=0.77 poolTop=0.018 poolT=0.52 light=1.00 ok
on again 60s   blobs= 3 r=[0.109..0.138] ymax=0.56 poolTop=0.060 poolT=0.57 light=1.00 ok
timing: field compute+paint 0.905 ms, physics step 0.0031 ms (x2 per frame)
ALL CHECKS PASSED

=== phone 390x844 ===
----- Native stack trace -----

 1: 0x10348e30c node::InitializeOncePerProcessInternal(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>> const&, node::ProcessInitializationFlags::Flags) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib]
 2: 0x10348ee78 node::Start(int, char**) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib]
 3: 0x195eebe80 start [/usr/lib/dyld]
exit=134
-rw-r--r--@ 1 [redacted:username]  wheel   9132 Oct 28 12:04 .chrome-tmp/field_off.png
-rw-r--r--@ 1 [redacted:username]  wheel  28087 Oct 28 12:04 .chrome-tmp/field_on.png
zsh:1: operation not permitted: [redacted:local-path]

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[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/.chrome-tmp/harness.js",
  "old_string": "  fs.writeFileSync(path.join(__dirname, name), png(W * S, H * S, out));",
  "new_string": "  const outDir = process.argv[4] ? path.resolve(process.argv[4]) : __dirname;\n  fs.mkdirSync(outDir, { recursive: true });\n  fs.writeFileSync(path.join(outDir, name), png(W * S, H * S, out));"
}

[tool result]
The file [workspace]/.chrome-tmp/harness.js has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Read]
{
  "file_path": "[workspace]/.chrome-tmp/field_on.png"
}

[tool result]
[image]

[tool Read]
{
  "file_path": "[workspace]/.chrome-tmp/field_off.png"
}

[tool result]
[image]

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[thinking]
Rendering works and physics checks pass, but I found shading artifacts: near-zero gradient normalization causes dark spokes at blob centers, and the pool's linear cutoff creates a crease. I'll fix these by using heightmap-style normals, smoothing the pool kernel, tightening the metaball bridging radius, spacing out pool emissions, and slightly brightening the off-state wax.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "const THR = 0.5625;      // metaball threshold: an isolated blob renders exactly at its radius\nconst EDGE = 0.07;       // anti-aliasing band in field units\nconst MAX_BLOBS = 12;",
  "new_string": "const KR = 1.6;          // kernel influence radius as a multiple of the blob radius\nconst THR = Math.pow(1 - 1 / (KR * KR), 2);   // threshold so an isolated blob renders exactly at its radius\nconst EDGE = 0.07;       // anti-aliasing band in field units\nconst POOL_D = 0.05;     // how far above the pool surface its field reaches (normalized units)\nconst MAX_BLOBS = 14;"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "function spawnFromPool() {\n  const r = 0.055 + Math.random() * 0.04, m = r * r;\n  if (pool.mass - m < 0.006) return;\n  pool.mass -= m;\n  blobs.push({ x: (Math.random() - 0.5) * HWB * 0.9, y: poolTop() + r * 0.75, vx: 0, vy: 0.04,\n               r, m, T: 0.85, noMerge: 0, ph: Math.random() * 6.283 });\n}",
  "new_string": "function spawnFromPool() {\n  const r = 0.05 + Math.random() * 0.035, m = r * r;\n  if (pool.mass - m < 0.006) return;\n  // pick the candidate x that is farthest from blobs still hanging around the bottom\n  const span = HWB - r - 0.02;\n  let bestX = 0, bestD = -1;\n  for (let k = 0; k < 5; k++) {\n    const x = (Math.random() * 2 - 1) * span;\n    let dmin = 9;\n    for (const b of blobs) if (b.y < 0.35) dmin = Math.min(dmin, Math.abs(b.x - x) - b.r);\n    if (dmin > bestD) { bestD = dmin; bestX = x; }\n  }\n  pool.mass -= m;\n  blobs.push({ x: bestX, y: poolTop() + r * 0.75, vx: 0, vy: 0.04,\n               r, m, T: 0.85, noMerge: 0, ph: Math.random() * 6.283 });\n}"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Edit]
{
  "replace_all": true,
  "file_path": "[workspace]/index.html",
  "old_string": "noMerge: 2.5, ph:",
  "new_string": "noMerge: 4, ph:"
}

[tool result]
The file [workspace]/index.html has been updated. All occurrences were successfully replaced. (file state is current in your context — no need to Read it back)

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  const cxF = FW / 2, pt = poolTop(), SP = 22, bulgeMax = 0.025;\n  const yStart = Math.max(0, Math.floor((1 - (pt + bulgeMax + THR / SP)) * FH));\n  for (let gy = yStart; gy < FH; gy++) {\n    const yn = 1 - (gy + 0.5) / FH;\n    for (let gx = 0; gx < FW; gx++) {\n      const xn = (gx + 0.5 - cxF) / FH;\n      const v = THR + (pt + bulgeMax * (1 - xn * xn / (HWB * HWB)) - yn) * SP;\n      if (v > 0) { const i = gy * FW + gx; F[i] += v; FT[i] += v * pool.T; }\n    }\n  }\n  for (let n = 0; n < blobs.length; n++) {\n    const b = blobs[n];\n    const bx = cxF + b.x * FH, by = (1 - b.y) * FH, R = b.r * FH * 2, R2 = R * R;",
  "new_string": "  const cxF = FW / 2, pt = poolTop(), bulgeMax = 0.025, SP = 2 * THR / POOL_D, invD = 1 / POOL_D;\n  const yStart = Math.max(0, Math.floor((1 - (pt + bulgeMax + POOL_D)) * FH));\n  for (let gy = yStart; gy < FH; gy++) {\n    const yn = 1 - (gy + 0.5) / FH;\n    for (let gx = 0; gx < FW; gx++) {\n      const xn = (gx + 0.5 - cxF) / FH;\n      const u = pt + bulgeMax * (1 - xn * xn / (HWB * HWB)) - yn;   // depth below the pool surface\n      let v;\n      if (u >= 0) v = THR + u * SP;                                  // inside the pool: linear ramp\n      else if (u > -POOL_D) { const w = 1 + u * invD; v = THR * w * w; } // above: smooth quadratic falloff\n      else continue;\n      const i = gy * FW + gx; F[i] += v; FT[i] += v * pool.T;\n    }\n  }\n  for (let n = 0; n < blobs.length; n++) {\n    const b = blobs[n];\n    const bx = cxF + b.x * FH, by = (1 - b.y) * FH, R = b.r * FH * KR, R2 = R * R;"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  const lo = THR - EDGE, invE = 255 / EDGE, lt = light;\n  const keyAmt = 0.22 * (0.35 + 0.65 * lt), specAmt = 0.6 * (0.3 + 0.7 * lt);\n  for (let gy = 0; gy < FH; gy++) {\n    const rowFrac = gy / FH, bulb = lt * (0.2 + 0.8 * rowFrac * rowFrac);\n    const inY = gy > 0 && gy < FH - 1;\n    for (let gx = 0; gx < FW; gx++) {\n      const i = gy * FW + gx, f = F[i];\n      if (f < lo) { fieldPix[i] = 0; continue; }\n      const a = f - lo >= EDGE ? 255 : ((f - lo) * invE) | 0;\n      const t = FT[i] / f;\n      const dfx = (gx > 0 && gx < FW - 1) ? F[i + 1] - F[i - 1] : 0;\n      const dfy = inY ? F[i + FW] - F[i - FW] : 0;\n      const gl = Math.sqrt(dfx * dfx + dfy * dfy) + 1e-6;\n      const nx = -dfx / gl, ny = -dfy / gl;              // outward normal, screen coords\n      const kd = nx * -0.45 - ny * 0.6;                   // room light from upper left\n      const inside = Math.min(1, (f - THR) * 1.6);\n      let shade = 0.5 + 0.22 * inside + keyAmt * (kd > 0 ? kd : 0) + bulb * (0.3 + 0.45 * (ny > 0 ? ny : 0));\n      let sp = kd - 0.62; sp = sp > 0 ? sp * sp * 6.6 * specAmt : 0;\n      // wax colour: cool red -> hot orange-yellow, darkened when the lamp is off\n      let r = 210 + 45 * t, g = 55 + 120 * t, b = 35 + 10 * t;\n      r = 58 + (r - 58) * lt; g = 20 + (g - 20) * lt; b = 16 + (b - 16) * lt;",
  "new_string": "  const lo = THR - EDGE, invE = 255 / EDGE, lt = light;\n  const keyAmt = 0.5 * (0.4 + 0.6 * lt), specAmt = 0.7 * (0.3 + 0.7 * lt);\n  const S = 0.045 * FH;                                   // field slope -> surface tilt (treat field as a height map)\n  for (let gy = 0; gy < FH; gy++) {\n    const rowFrac = gy / FH, bulb = lt * (0.15 + 0.85 * rowFrac * rowFrac);\n    const inY = gy > 0 && gy < FH - 1;\n    for (let gx = 0; gx < FW; gx++) {\n      const i = gy * FW + gx, f = F[i];\n      if (f < lo) { fieldPix[i] = 0; continue; }\n      const a = f - lo >= EDGE ? 255 : ((f - lo) * invE) | 0;\n      const t = FT[i] / f;\n      const nx = (gx > 0 && gx < FW - 1) ? (F[i - 1] - F[i + 1]) * S : 0;\n      const ny = inY ? (F[i - FW] - F[i + FW]) * S : 0;\n      const inv = 1 / Math.sqrt(nx * nx + ny * ny + 1);    // normal = (nx, ny, 1) normalized\n      const kd = (nx * -0.45 - ny * 0.6 + 0.66) * inv;     // room light from the upper left, in front\n      const kb = (ny * 0.8 + 0.6) * inv;                   // bulb light from below\n      const inside = Math.min(1, (f - THR) * 1.6);\n      let shade = 0.3 + 0.12 * inside + keyAmt * (kd > 0 ? kd : 0) + bulb * 0.55 * (kb > 0 ? kb : 0);\n      let sp = (kd - 0.74) * 3.85; sp = sp > 0 ? sp * sp * specAmt : 0;\n      // wax colour: cool red -> hot orange-yellow, darkened when the lamp is off\n      let r = 210 + 45 * t, g = 55 + 120 * t, b = 35 + 10 * t;\n      r = 96 + (r - 96) * lt; g = 38 + (g - 38) * lt; b = 30 + (b - 30) * lt;"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

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[tool Bash]
{
  "command": "cd \"$PWD\" && for i in 1 2 3; do HOME=\"$PWD\" node .chrome-tmp/harness.js 390 844 .chrome-tmp/phone > .chrome-tmp/phone.log 2>&1 && break; sleep 1; done; cat .chrome-tmp/phone.log | grep -v 'Native stack' ; ls .chrome-tmp/phone",
  "description": "Run the node harness at phone size with retries, dump field PNGs",
  "timeout": 180000
}

[tool error]
Exit code 1
viewport 390x844 field 85x169 cells=14365 cell=2px liquidH=339px
after presim   blobs= 2 r=[0.089..0.110] ymax=0.33 poolTop=0.116 poolT=0.62 light=1.00 ok
on t=10s       blobs= 6 r=[0.068..0.109] ymax=0.57 poolTop=0.072 poolT=0.56 light=1.00 ok
on t=20s       blobs= 6 r=[0.053..0.159] ymax=0.77 poolTop=0.058 poolT=0.59 light=1.00 ok
on t=30s       blobs= 8 r=[0.073..0.103] ymax=0.79 poolTop=0.044 poolT=0.80 light=1.00 ok
on t=40s       blobs= 4 r=[0.073..0.151] ymax=0.49 poolTop=0.070 poolT=0.54 light=1.00 ok
on t=50s       blobs= 3 r=[0.093..0.135] ymax=0.51 poolTop=0.076 poolT=0.59 light=1.00 ok
on t=60s       blobs= 8 r=[0.066..0.113] ymax=0.72 poolTop=0.043 poolT=0.62 light=1.00 ok
on t=70s       blobs= 7 r=[0.067..0.124] ymax=0.63 poolTop=0.039 poolT=0.78 light=1.00 ok
on t=80s       blobs= 9 r=[0.071..0.094] ymax=0.84 poolTop=0.033 poolT=0.69 light=1.00 ok
on t=90s       blobs= 7 r=[0.065..0.115] ymax=0.84 poolTop=0.039 poolT=0.79 light=1.00 ok
on t=100s      blobs= 4 r=[0.067..0.106] ymax=0.55 poolTop=0.086 poolT=0.55 light=1.00 ok
on t=110s      blobs= 6 r=[0.054..0.093] ymax=0.67 poolTop=0.089 poolT=0.78 light=1.00 ok
on t=120s      blobs= 7 r=[0.063..0.110] ymax=0.60 poolTop=0.063 poolT=0.62 light=1.00 ok
blob count range while on: 3..9
off t=6s       blobs= 7 r=[0.059..0.126] ymax=0.70 poolTop=0.056 poolT=0.44 light=0.00 ok
off t=16s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.25 light=0.00 ok
off t=26s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.17 light=0.00 ok
off t=36s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.11 light=0.00 ok
off t=46s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.08 light=0.00 ok
off t=56s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.05 light=0.00 ok
off t=66s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.03 light=0.00 ok
off t=76s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.02 light=0.00 ok
off t=86s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.02 light=0.00 ok
off t=96s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.01 light=0.00 ok
after 96s off: blobs=0 (expect 0), light=0
on again 10s   blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.84 light=1.00 ok
on again 20s   blobs= 4 r=[0.058..0.104] ymax=0.73 poolTop=0.099 poolT=0.55 light=1.00 ok
on again 30s   blobs= 4 r=[0.078..0.120] ymax=0.53 poolTop=0.077 poolT=0.73 light=1.00 ok
on again 40s   blobs= 6 r=[0.064..0.114] ymax=0.76 poolTop=0.064 poolT=0.57 light=1.00 ok
on again 50s   blobs= 6 r=[0.054..0.104] ymax=0.63 poolTop=0.070 poolT=0.60 light=1.00 ok
on again 60s   blobs= 6 r=[0.073..0.099] ymax=0.64 poolTop=0.053 poolT=0.85 light=1.00 ok
timing: field compute+paint 0.651 ms, physics step 0.0041 ms (x2 per frame)
ALL CHECKS PASSED
field_off.png
field_on.png
zsh:1: operation not permitted: [redacted:local-path]

[tool Bash]
{
  "command": "cd \"$PWD\" && for i in 1 2 3; do HOME=\"$PWD\" node .chrome-tmp/harness.js 1280 800 .chrome-tmp/desktop > .chrome-tmp/desktop.log 2>&1 && break; sleep 1; done; grep -E 'viewport|range|timing|PASSED|FAIL' .chrome-tmp/desktop.log; ls .chrome-tmp/desktop",
  "description": "Run the node harness at desktop size with retries, summary only",
  "timeout": 180000
}

[tool error]
Exit code 1
viewport 1280x800 field 100x201 cells=20100 cell=2px liquidH=402px
blob count range while on: 4..10
timing: field compute+paint 1.002 ms, physics step 0.0037 ms (x2 per frame)
ALL CHECKS PASSED
field_off.png
field_on.png
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.chrome-tmp/phone/field_on.png"
}

[tool result]
[image]

[tool Read]
{
  "file_path": "[workspace]/.chrome-tmp/phone/field_off.png"
}

[tool result]
[image]

[tool Read]
{
  "file_path": "[workspace]/.chrome-tmp/desktop/field_on.png"
}

[tool result]
[image]

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[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

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thinking_tokens

[system]
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[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
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[system]
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[thinking]
The shading now looks smooth and glossy with correct necking into the pool, and the off state reads as dim dark-red wax. Next I'll increase the pool's emission rate for a faster lamp restart, switch to Chrome's old headless mode to avoid the singleton socket issue, and double-check the canvas API names since the harness stubs accept any method.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  if (pool.T > 0.62 && blobs.length < MAX_BLOBS && Math.random() < 0.6 * dt) { spawnFromPool(); pool.T -= 0.18; }",
  "new_string": "  if (pool.T > 0.62 && blobs.length < MAX_BLOBS && Math.random() < (0.6 + 3 * (pool.T - 0.62)) * dt) { spawnFromPool(); pool.T -= 0.18; }"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "cd \"$PWD\" && \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --version 2>/dev/null; mkdir -p .chrome-tmp/q5 && MAC_CHROMIUM_TMPDIR=\"$PWD/.chrome-tmp\" timeout 60 \"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\" --headless=old --disable-gpu --disable-crash-reporter --no-first-run --no-default-browser-check --user-data-dir=\"$PWD/.chrome-tmp/q5\" --window-size=390,844 --hide-scrollbars --virtual-time-budget=4000 --screenshot=\"$PWD/.chrome-tmp/phone.png\" \"file://$PWD/index.html\" 2>&1 | grep -v -iE 'crashpad|xattr|sandbox_extension' | tail -4; ls -la .chrome-tmp/phone.png 2>&1",
  "description": "Try Chrome's old headless mode for a phone-size screenshot",
  "timeout": 90000
}

[tool error]
Exit code 1
Google Chrome 156.0.8078.73 
[80084:18430606:1028/120745.693016:ERROR:chrome/browser/process_singleton_posix.cc:1083] Failed to bind() [workspace]/.chrome-tmp/com.google.Chrome.ZKbZh4/SingletonSocket: Operation not permitted (1)
[80084:18430606:1028/120745.693113:ERROR:chrome/app/chrome_main_delegate.cc:624] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption.
ls: .chrome-tmp/phone.png: No such file or directory

[tool Grep]
{
  "pattern": "\\b(?:g|ctx|fieldCtx|gr|gradient)\\.([A-Za-z]+)\\(",
  "path": "[workspace]/index.html",
  "output_mode": "content",
  "-o": true,
  "-n": false,
  "head_limit": 0
}

[tool result]
g.setTransform(
g.beginPath(
g.moveTo(
g.lineTo(
g.arc(
g.lineTo(
g.closePath(
ctx.setTransform(
fieldCtx.createImageData(
ctx.createRadialGradient(
ctx.createRadialGradient(
ctx.createLinearGradient(
ctx.createLinearGradient(
ctx.createRadialGradient(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
g.fillRect(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
g.beginPath(
g.lineTo(
g.stroke(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
g.fillRect(
g.createRadialGradient(
gr.addColorStop(
gr.addColorStop(
g.save(
g.translate(
g.scale(
g.translate(
g.fillRect(
g.restore(
g.beginPath(
g.moveTo(
g.bezierCurveTo(
g.stroke(
g.beginPath(
g.moveTo(
g.bezierCurveTo(
g.stroke(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
g.save(
g.clip(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
g.createRadialGradient(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
g.restore(
g.stroke(
g.beginPath(
g.moveTo(
g.lineTo(
g.lineTo(
g.lineTo(
g.closePath(
g.fill(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
g.fill(
g.beginPath(
g.ellipse(
g.fill(
g.stroke(
g.beginPath(
g.ellipse(
g.stroke(
g.fillRect(
g.beginPath(
g.moveTo(
g.lineTo(
g.lineTo(
g.lineTo(
g.closePath(
g.fill(
g.beginPath(
g.ellipse(
g.fill(
g.stroke(
g.beginPath(
g.ellipse(
g.stroke(
g.createRadialGradient(
gr.addColorStop(
gr.addColorStop(
gr.addColorStop(
g.save(
g.translate(
g.scale(
g.translate(
g.fillRect(
g.restore(
g.save(
g.clip(
g.createLinearGradient(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
g.restore(
g.createRadialGradient(
gr.addColorStop(
gr.addColorStop(
g.fillRect(
ctx.drawImage(
ctx.fillRect(
ctx.fillRect(
ctx.save(
ctx.clip(
ctx.fillRect(
ctx.fillRect(
ctx.fillRect(
fieldCtx.putImageData(
ctx.drawImage(
ctx.restore(
ctx.drawImage(
ctx.drawImage(

[system]
status

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[system]
thinking_tokens

[assistant]
All canvas method names check out, and Chrome's old headless mode hits the same socket restriction, so the node harness remains the verification path. Re-running it after the emission tweak.

[tool Bash]
{
  "command": "cd \"$PWD\" && for i in 1 2 3; do HOME=\"$PWD\" node .chrome-tmp/harness.js 390 844 .chrome-tmp/phone > .chrome-tmp/phone.log 2>&1 && break; sleep 1; done; grep -E 'viewport|presim|on t=120|off t=6|off t=96|on again (10|20|60)s|range|timing|PASSED|FAIL|NON-FINITE|OUT OF|DRIFT' .chrome-tmp/phone.log",
  "description": "Re-run the phone-size harness after the emission tweak and show a summary",
  "timeout": 180000
}

[tool result]
viewport 390x844 field 85x169 cells=14365 cell=2px liquidH=339px
after presim   blobs= 4 r=[0.084..0.120] ymax=0.46 poolTop=0.078 poolT=0.51 light=1.00 ok
on t=120s      blobs= 7 r=[0.060..0.143] ymax=0.79 poolTop=0.035 poolT=0.55 light=1.00 ok
blob count range while on: 3..12
off t=6s       blobs= 7 r=[0.074..0.124] ymax=0.75 poolTop=0.038 poolT=0.41 light=0.00 ok
off t=66s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.03 light=0.00 ok
off t=96s      blobs= 0 r=[-] ymax=- poolTop=0.156 poolT=0.01 light=0.00 ok
on again 10s   blobs= 2 r=[0.067..0.085] ymax=0.45 poolTop=0.133 poolT=0.69 light=1.00 ok
on again 20s   blobs= 3 r=[0.077..0.146] ymax=0.66 poolTop=0.086 poolT=0.70 light=1.00 ok
on again 60s   blobs= 8 r=[0.065..0.131] ymax=0.64 poolTop=0.027 poolT=0.57 light=1.00 ok
timing: field compute+paint 0.712 ms, physics step 0.0031 ms (x2 per frame)
ALL CHECKS PASSED
zsh:1: operation not permitted: [redacted:local-path]

[system]
status

[system]
thinking_tokens

[system]
thinking_tokens

[assistant]
All checks pass. Cleaning up the temporary harness and Chrome profile directories so only `index.html` remains.

[tool Bash]
{
  "command": "cd \"$PWD\" && rm -rf .chrome-tmp && ls -la && wc -c index.html",
  "description": "Remove temporary harness/profile directory and list the final project folder"
}

[tool error]
Exit code 1
total 48
drwx------@ 4 [redacted:username]  wheel    128 Oct 28 12:08 .
drwx------@ 5 [redacted:username]  wheel    160 Oct 28 11:35 ..
drwxr-xr-x@ 3 [redacted:username]  wheel     96 Oct 28 11:50 .claude
-rw-r--r--@ 1 [redacted:username]  wheel  23660 Oct 28 12:07 index.html
   23660 index.html
zsh:1: operation not permitted: [redacted:local-path]

[system]
status

[assistant]
The lava lamp is done: a single `index.html` with no external requests, at about 24 KB.

**What it does**

- **Scene**: a brass-based glass lamp on a wood desk against a dark wall, with a shadow under the base and a power cord running to a rocker switch on the desk.
- **Wax physics**: blobs heat up near the bulb, gain buoyancy and rise, cool as they climb, then sink back. Big blobs pinch off into two, and blobs that touch fuse into one. Sinking blobs rejoin the molten pool at the bottom, which emits fresh blobs as it reheats. Wax mass is conserved throughout.
- **Rendering**: blobs are metaballs accumulated on a small grid (about 2 CSS px per cell) and shaded as a height map, so merging and splitting show as smooth necking rather than overlapping circles. Hot wax glows orange-yellow and cool wax turns deep red. The liquid, wall glow and desk glow fade in and out with the bulb.
- **Switch**: a real `<button>` with `aria-pressed`, keyboard focusable, large enough for touch. Turning the lamp off dims the bulb over a couple of seconds, stops the heating, and the wax slowly settles into the pool. Turning it back on reheats the pool, and blobs start emerging after a few seconds.
- **Phone fit**: the lamp scales to the viewport and the pixel ratio is capped at 2. Static layers (wall, desk, base, glass highlights) are pre-rendered once per resize, so each frame is three layer blits, a few gradient fills and the wax field.

**Verification**

Headless Chrome cannot run in this sandbox because its single-instance socket `bind()` is refused, so I could not capture full-page screenshots. Instead I ran the inline script under node with DOM stubs:

- No NaNs, no out-of-bounds blobs, no mass drift over several minutes of simulated time, across on, off, and on-again cycles.
- All blobs return to the pool within about 10 s of switching off, and emission resumes after switching on.
- Wax field cost per frame: 0.71 ms at phone size, 1.0 ms at desktop size, on this machine. Physics is negligible. That leaves ample headroom for 60 fps even on a phone several times slower.
- I dumped the wax field as images and checked the shading, necking, and off-state appearance visually.

To look at it yourself:

```
open [workspace]/index.html
```

One thing worth checking on a real device is the overall composition of base, glass and switch, since that part could only be verified by auditing the drawing code rather than by screenshot.

[result]
success, turns 45, duration 1978304 ms
The lava lamp is done: a single `index.html` with no external requests, at about 24 KB.

**What it does**

- **Scene**: a brass-based glass lamp on a wood desk against a dark wall, with a shadow under the base and a power cord running to a rocker switch on the desk.
- **Wax physics**: blobs heat up near the bulb, gain buoyancy and rise, cool as they climb, then sink back. Big blobs pinch off into two, and blobs that touch fuse into one. Sinking blobs rejoin the molten pool at the bottom, which emits fresh blobs as it reheats. Wax mass is conserved throughout.
- **Rendering**: blobs are metaballs accumulated on a small grid (about 2 CSS px per cell) and shaded as a height map, so merging and splitting show as smooth necking rather than overlapping circles. Hot wax glows orange-yellow and cool wax turns deep red. The liquid, wall glow and desk glow fade in and out with the bulb.
- **Switch**: a real `<button>` with `aria-pressed`, keyboard focusable, large enough for touch. Turning the lamp off dims the bulb over a couple of seconds, stops the heating, and the wax slowly settles into the pool. Turning it back on reheats the pool, and blobs start emerging after a few seconds.
- **Phone fit**: the lamp scales to the viewport and the pixel ratio is capped at 2. Static layers (wall, desk, base, glass highlights) are pre-rendered once per resize, so each frame is three layer blits, a few gradient fills and the wax field.

**Verification**

Headless Chrome cannot run in this sandbox because its single-instance socket `bind()` is refused, so I could not capture full-page screenshots. Instead I ran the inline script under node with DOM stubs:

- No NaNs, no out-of-bounds blobs, no mass drift over several minutes of simulated time, across on, off, and on-again cycles.
- All blobs return to the pool within about 10 s of switching off, and emission resumes after switching on.
- Wax field cost per frame: 0.71 ms at phone size, 1.0 ms at desktop size, on this machine. Physics is negligible. That leaves ample headroom for 60 fps even on a phone several times slower.
- I dumped the wax field as images and checked the shading, necking, and off-state appearance visually.

To look at it yourself:

```
open [workspace]/index.html
```

One thing worth checking on a real device is the overall composition of base, glass and switch, since that part could only be verified by auditing the drawing code rather than by screenshot.