---
Task ID: 1
Agent: main
Task: Convert the uploaded HTML chemistry virtual lab (Pengaruhkonsentrasiterhadaplajureaksi(3).html, 4451 lines) into a complete, working Next.js application accessible at the / route.

Work Log:
- Read the uploaded HTML file (4,451 lines) — a self-contained chemistry virtual lab "Pengaruh Konsentrasi terhadap Laju Reaksi" with Three.js 3D simulation (Erlenmeyer flask), Chart.js graphs, MathJax equations, jsPDF export, 5 tabs (Makroskopis, Mikroskopis, Teori, KPS, Kuis), experiment design panel, history panel, guided tour, theme switcher, sound effects, and keyboard shortcuts.
- Confirmed the HTML is fully complete (no TODO/stub markers — the file is version 3 and self-contained).
- Decided integration strategy: serve the HTML as a standalone asset in /public and load it via a full-screen iframe in page.tsx. This preserves all CDN-loaded libraries (Three.js importmap, Tailwind Play CDN, Chart.js, MathJax, jsPDF) and the 4,451 lines of vanilla JS without risky conversion.
- Copied the HTML to /home/z/my-project/public/lab-kimia.html (260 KB).
- Rewrote /home/z/my-project/src/app/page.tsx as a client component: full-viewport iframe with a custom animated flask loading overlay, error fallback with reload button, and a 15s safety timeout.
- Updated /home/z/my-project/src/app/layout.tsx metadata (title, description, keywords, OG/Twitter) to match the chemistry lab topic.
- Verified dev server (already running on port 3000) compiles cleanly; `bun run lint` passes with zero errors.
- Verified /lab-kimia.html is served (HTTP 200, 260,374 bytes).
- Used Agent Browser to perform end-to-end verification:
  - Page loads, title correct ("Lab Virtual Kimia: Pengaruh Konsentrasi terhadap Laju Reaksi").
  - No console errors; only the expected Tailwind-CDN-in-production warning.
  - Tutorial modal ("Selamat Datang!") appears and closes on "MULAI EKSPLORASI".
  - All 5 tabs (Makroskopis/Mikroskopis/Teori/KPS/Kuis) switch correctly (panel-hidden toggles verified).
  - Macro experiment golden path: clicked "MULAI REAKSI" → button becomes "STOP", timer ran to ~18s, WebGL canvas present; clicked "STOP" → button reverts, 1 data row recorded in the observation table.
  - Quiz panel renders 40 quiz options (10 questions × 4 options).
  - Mobile (375×812): tab bar visible, layout stacks vertically — responsive.
- Used VLM (z-ai vision) to visually confirm both desktop and mobile screenshots: "The application appears fully functional. All UI elements, including the 3D simulation, control panels, data tables, and navigation tabs, are visible, properly aligned, and aesthetically consistent. There are no signs of rendering errors or missing assets."
- Cleaned up temporary screenshot files and closed the browser.

Stage Summary:
- The chemistry virtual lab is now live at the / route of the Next.js project.
- Architecture: Next.js page.tsx (client component) → full-screen iframe → /public/lab-kimia.html (self-contained HTML with Three.js, Chart.js, MathJax, jsPDF via CDN).
- All core features verified working: 3D Erlenmeyer flask simulation, reaction start/stop with live timer, data recording in observation table, tab navigation across all 5 panels, quiz rendering, responsive mobile layout.
- No lint errors, no runtime errors, no console errors (besides expected Tailwind CDN advisory).
- Artifacts: src/app/page.tsx (iframe wrapper), src/app/layout.tsx (updated metadata), public/lab-kimia.html (the lab).

---
Task ID: 2
Agent: main
Task: Completely fix/replace the Mikroskopis (Microscopic) section of the chemistry virtual lab — rebuild molecule models, collision physics, energy distribution, and UI panels.

Work Log:
- Read the entire microscopic section of public/lab-kimia.html: panel-micro HTML (lines 1059-1170), info-micro legend (624-656), status-micro panel (718-741), and all JS functions (createMicroscopicWorld, resetMolecules, updateMolecules, createReactionFlash, createIneffectiveFlash, updateReactionFlashes, bounce — lines 2441-2962).
- Identified issues in the original: (a) molecules were plain single spheres with MeshBasicMaterial — no actual molecular structure; (b) bounce() had restitution factor 1.9 (super-elastic, adds energy on each collision — unphysical); (c) no orientation-based reaction check (misses a key collision theory concept); (d) energy distribution was a bare Chart.js line with no Eₐ threshold visualization; (e) no idle animation (scene was empty/frozen until "Mulai" pressed); (f) no live insight narration.
- Designed a complete rebuild with: realistic 2-atom molecule models (Na₂S₂O₃ as Na+S₂O₃, HCl as H+Cl, S product), proper elastic collisions (restitution 1.0), orientation-based reactions (reactive atoms must face each other), custom Maxwell-Boltzmann canvas with Eₐ threshold line + reactive fraction, idle Brownian motion, and live insight with effective/ineffective breakdown.
- Wrote new_micro_js.js containing all replacement JS functions (createMicroscopicWorld, buildMolecule, resetMolecules, updateMolecules, updateMoleculesIdle, reactiveWorldDir, midPoint, doReaction, spawnByproducts, createReactionFlash, createIneffectiveFlash, updateReactionFlashes, bounce, drawEnergyDistribution, updateMicroInsight).
- Wrote fix_micro.py Python script using regex to surgically replace 9 blocks: (1) added state vars effectiveCollisions/ineffectiveEnergy/ineffectiveOrient; (2) info-micro legend HTML; (3) status-micro panel HTML; (4) panel-micro bottom panel HTML; (5) JS functions createMicroscopicWorld→bounce; (6) initCharts energy block → custom canvas; (7) temp-slider listener updateEnergyChart→drawEnergyDistribution; (8) ea-slider listener added drawEnergyDistribution call; (9) switchTab micro branch added drawEnergyDistribution call.
- Ran the script: all 9 replacements applied cleanly. Stale reference check: 0 occurrences of m.mesh, m.coreHalo, updateEnergyChart, chartEnergy. All 10 new functions present. File grew from 259,899 to 267,591 bytes (+7,692).
- First browser test: simulation ran (93+ collisions) but 0 reactions — energy scaling factor (*800) was too low relative to Eₐ range (1-100). Fixed: changed to *8000 so average particle KE at 25°C ≈ 20 (below Eₐ=50), at 100°C ≈ 80 (above Eₐ=50).
- Second test: reactions now occur (2 reactions from 180 collisions). But insight percentages were calculated against ALL collisions (including A-A, B-B bounces) — misleading. Fixed: calculate orient/energy fail percentages against A-B collision count only (effectiveCollisions + ineffectiveOrient + ineffectiveEnergy).
- Third test: orientation threshold 0.35 (69°) was too strict (95% orientation failure). Relaxed to 0.15 (81°) for a more engaging learning experience while still teaching that orientation matters.
- Comprehensive scenario testing verified correct pedagogical trends:
  - Default (Eₐ=50, 25°C, 50 particles): 1 reaction, 2% A-B effective
  - Low Eₐ (20): 5 reactions — lowering Eₐ increases reactions ✓
  - High temp (80°C): 11% A-B effective — temperature increases effectiveness ✓
  - High concentration (80 particles): 339 collisions vs 68 — more particles → more collisions ✓
  - Catalyst ON: 5 reactions vs 1 without — catalyst (Eₐ×0.6) increases reactions ✓
- VLM visual verification confirmed: multi-colored molecule models visible in cylindrical container, yellow sulfur product particles forming among reactants, all 4 bottom panels (controls, statistics with Maxwell-Boltzmann chart, collision time chart, concept cards) rendering properly.
- Verified: energy chart canvas actively drawing (242×73 px), all 17 key DOM elements present, mobile responsive (single-column stack at 375px), no console errors, lint passes clean.
- Cleaned up all temporary files (screenshots, temp JS, Python script).

Stage Summary:
- The Mikroskopis section is completely rebuilt with realistic molecule models, proper collision physics, and enhanced educational visualizations.
- Key improvements: (1) 2-atom molecule models with bonds that rotate as they move; (2) orientation-based reactions teaching both collision theory requirements (energy + orientation); (3) proper elastic collisions (restitution 1.0); (4) custom Maxwell-Boltzmann distribution with Eₐ threshold line and reactive fraction %; (5) idle Brownian animation so the scene is alive before pressing Start; (6) live insight narration with effective/ineffective collision breakdown; (7) byproduct particle burst on reactions.
- All pedagogical trends verified correct: Eₐ↓→more reactions, T↑→more reactions, concentration↑→more collisions, catalyst→more reactions.
- No errors, lint clean, mobile responsive. Artifacts updated: public/lab-kimia.html.

---
Task ID: 3
Agent: main
Task: Add modern visual features to make the chemistry virtual lab look more modern and polished.

Work Log:
- Read the current CSS styling (lines 175-448) and HTML structure of public/lab-kimia.html to identify modernization opportunities without breaking existing JS functionality.
- Designed a comprehensive CSS-only modernization (non-invasive, no JS logic changes) plus minimal HTML injections.
- Used MultiEdit to apply 3 surgical edits:
  1. Injected aurora background HTML (3 glowing orbs) inside #canvas-container, before grid-pattern — visible behind the transparent WebGL canvas (alpha:true).
  2. Added a gradient progress bar div to the loading screen.
  3. Injected a 170-line "MODERN VISUAL ENHANCEMENTS" CSS block before </style>.
- Modern CSS features added:
  - **Animated aurora background**: 3 drifting/blurred gradient orbs (emerald, purple, cyan) with mix-blend-mode screen behind the 3D scene.
  - **Enhanced glassmorphism**: gradient borders on all glass panels using ::before mask-composite technique (emerald→purple→cyan).
  - **Gradient text headings**: .font-display gets white→emerald gradient (dark theme), dark→emerald (light theme), yellow (contrast theme).
  - **Button shine sweep**: ::after gradient sweep on .btn-primary/.btn-danger/.btn-warning hover.
  - **Neon glow on numbers**: text-shadow on .conc-display, #timer, #collision-count, #reaction-count.
  - **Modern scrollbar**: gradient emerald→cyan thumb with hover glow.
  - **Animated grid pattern**: 40s pan animation on .grid-pattern.
  - **Pulsing status indicator**: enhanced pulseGlow with expanding ring.
  - **Card hover effects**: box-shadow glow on all glass panels, translateY lift only on bottom control panels (.max-w-7xl .glass-panel).
  - **Slider thumb ring glow**: colored ring per slider type (purple/eA, green/particle, orange/temp).
  - **Loading progress bar**: animated gradient sweep.
  - **Body fade-in**: 0.6s opacity transition on load.
  - **Modal shadow enhancement**: deeper shadow + emerald border glow.
  - **Header backdrop blur**: glass header effect.
  - **Data table hover**: row highlight with emerald tint.
  - **Preset/quiz/theory card**: rounded corners + hover glow.
  - **Canvas depth**: inset box-shadow for vignette.
- Verified with Agent Browser:
  - No console errors after all changes.
  - Loading screen: flask icon + progress bar + glowing title confirmed by VLM.
  - Macro tab: aurora orbs visible behind 3D, gradient borders on panels, gradient text headings, neon glow on timer — VLM confirmed "very modern and polished, dark-mode aesthetic with neon accents, glassmorphism, clean typography."
  - Micro tab: glass panels with gradient borders, glowing molecule container, neon stats — VLM confirmed.
  - Quiz/Teori tabs: rendered correctly.
  - Light theme: gradient text switches to dark→emerald (readable), panels light — VLM confirmed "excellent contrast, highly readable."
  - Contrast theme: gradient text becomes yellow, aurora disabled.
  - Functional tests all pass: macro reaction (timer runs, data recorded), micro simulation (collisions counted), tab switching, theme cycling.
  - Mobile (375px): responsive layout confirmed by VLM.
  - Dev log: no errors. Lint: clean.
- Cleaned up all temporary screenshots.

Stage Summary:
- The chemistry virtual lab now has a significantly more modern, polished look with 15+ visual enhancements.
- Key modern features: animated aurora background, gradient glass borders, gradient text headings, button shine sweeps, neon number glow, modern gradient scrollbar, animated grid, enhanced pulsing indicators, slider ring glows, loading progress bar, body fade-in, card hover lift, header backdrop blur.
- All enhancements are CSS-only (no JS changes) — zero risk to existing functionality.
- All 3 themes (dark/light/contrast) verified. Mobile responsive. No errors, lint clean.
- Artifacts updated: public/lab-kimia.html.

---
Task ID: 4
Agent: main
Task: Remove the "Periksa Jawaban" (Check Answer) buttons from the KPS worksheet section.

Work Log:
- Found 5 "Periksa Jawaban"/"Validasi Data" buttons (skills 2,3,4,5,6) each calling checkKPS(skillNum) with an adjacent #kps-feedback-N div.
- Found the checkKPS() function (lines 3577-3636) and updateKPSScore() function (3638-3657) that powered the auto-evaluation.
- Found 7 updateKPSScore event listeners on KPS inputs (var-independent/dependent/control/predict/hypo-1/hypo-2/interpret).
- Found the "Skor KPS Objektif: 0/4" display (#kps-score) in the footer, plus reset and download functions referencing score/feedback.
- Used MultiEdit to remove all 5 buttons + their feedback divs in one atomic operation.
- Replaced the checkKPS function and updateKPSScore function (60 lines) with a single comment line noting removal.
- Removed the 7 updateKPSScore event listeners.
- Updated btn-reset-kps handler: removed the kps-card correct/incorrect class clearing, kps-feedback hiding, and kps-score reset; added clearing of quiz-option 'selected' class.
- Updated btn-download-kps handler: removed the "=== SKOR KPS OBJEKTIF: X/4 ===" line, replaced with "=== Akhir Lembar KPS ===".
- Removed the "Skor KPS Objektif" display div from the footer; changed footer from justify-between to justify-end since only buttons remain.
- Updated the instruction text: removed mention of "Periksa Jawaban", now says answers can be downloaded via "Download Jawaban".
- Stale reference check: 0 occurrences of checkKPS, updateKPSScore, "Periksa Jawaban", "Validasi Data", kps-feedback, kps-score, "Skor KPS".
- Verified with Agent Browser: KPS panel visible, only 2 buttons remain (Reset | Download Jawaban), 0 feedback divs, kps-score element removed, no console errors. Word counter works, radio selection works, select dropdowns work, reset clears inputs. Mobile (375px) confirms same 2 buttons.
- VLM visual verification confirmed: no "Periksa Jawaban" buttons, no score display.
- File now 269,960 bytes (down from ~277,561). Lint clean.

Stage Summary:
- All "Periksa Jawaban" auto-evaluation removed from the KPS worksheet — it is now an open-ended worksheet without answer checking.
- Removed: 5 check buttons, 5 feedback divs, checkKPS function, updateKPSScore function, 7 score listeners, score display, score line in download output, correct/incorrect card styling logic.
- Kept: all input fields/textarea/selects/radios/checkboxes, word counters, Reset button, Download Jawaban button (still exports all answers as text file, just without the score line).
- No errors, lint clean, mobile responsive. Artifacts updated: public/lab-kimia.html.
