feat: cinematic camera playback for 3D demo

- Add cinematicCamera.ts with 9 camera modes
- Smooth camera transitions with lerp
- Camera follows item during movement
- Category-aware routing views (B/C/D)
- Viewport adaptation (desktop/laptop/mobile)
- Motion trail for movement feedback
- Auto camera toggle button
- 20 unit tests for camera logic

docs/CINEMATIC_CAMERA_REPORT.md

@@ -0,0 +1,135 @@
+# Cinematic Camera Report
+
+## Summary
+
+Added cinematic camera playback system that automatically transitions between camera angles during the 8-case demo, creating a video-like experience.
+
+## Camera Modes Implemented
+
+| Mode | Phase(s) | Description |
+|------|----------|-------------|
+| `feedCloseup` | spawn | Close-up view of item appearing on belt at zone A |
+| `overview` | move_to_detection | Wide view following item along conveyor |
+| `inspectionTop` | detection | Top-down view showing camera rig and inspection zone |
+| `measurementSide` | measurement | Side view showing laser beam and item height |
+| `classificationTop` | classification | Top view for shape analysis visualization |
+| `routingWide` | command_sent | Wide view showing entire routing area |
+| `chuteCloseup` | routing | Close-up of chute/deflector and item routing |
+| `resultZone` | exit | View of destination zone (B/C/D roll-cage) |
+| `nextItemReset` | clear_gap | Reset view preparing for next item |
+
+## How Camera Follows Item
+
+1. **Target following**: During movement phases (`move_to_detection`, `routing`, `exit`), camera target partially follows item position with configurable weight (0.3-0.5)
+
+2. **Smooth transitions**: Uses lerp (linear interpolation) with smoothing factor of 0.04 for gradual transitions between camera positions, targets, and FOV
+
+3. **Category-aware routing**: Camera adjusts view based on target category:
+   - B: Main conveyor line view
+   - C: Rotates toward positive Z (orange roll-cage)
+   - D: Rotates toward negative Z (purple roll-cage)
+
+4. **Viewport adaptation**: Camera positions adjusted for screen size:
+   - Desktop: Standard positions
+   - Laptop: 15% higher, 10% further back
+   - Mobile: 30% higher, 25% further back, +8° FOV
+
+## Files Created/Modified
+
+### Created
+- `src/domain/cinematicCamera.ts` - Camera director logic
+- `src/domain/cinematicCamera.test.ts` - Unit tests (20 tests)
+- `scripts/test_cinematic_camera.py` - Browser QA script
+
+### Modified
+- `src/components/ThreeD/SorterDigitalTwinContinuous.tsx` - Added:
+  - `CinematicCameraController` component
+  - `MotionTrail` component for movement feedback
+  - Integration with OrbitControls (disabled during cinematic mode)
+- `src/pages/MainPage.tsx` - Added:
+  - Auto camera toggle button
+  - Viewport type detection
+  - Props passing to 3D component
+- `src/styles.css` - Added `.auto-camera-toggle` styles
+
+## Features
+
+### Auto Camera Toggle
+- Button in bottom-left corner: "AUTO CAM: ON/OFF"
+- When ON: Cinematic camera active during playback
+- When OFF: Manual OrbitControls enabled
+- Toggle persists during session
+
+### Motion Trail
+- Subtle visual trail behind moving items
+- Shows during `move_to_detection`, `routing`, `exit` phases
+- Direction matches item movement (X for main belt, Z for C/D routing)
+- Color matches target category
+
+### Viewport Adaptations
+- Desktop (≥1200px): Full cinematic experience
+- Laptop (768-1199px): Higher/wider camera, no overlay collision
+- Mobile (<768px): Fallback or simplified view, compact overlay
+
+## Phase Coverage
+
+All 9 playback phases have associated camera modes:
+- ✅ spawn → feedCloseup
+- ✅ move_to_detection → overview  
+- ✅ detection → inspectionTop
+- ✅ measurement → measurementSide
+- ✅ classification → classificationTop
+- ✅ command_sent → routingWide
+- ✅ routing → chuteCloseup
+- ✅ exit → resultZone
+- ✅ clear_gap → nextItemReset
+
+## Screenshots
+
+Location: `docs/cinematic_camera_screenshots/`
+
+- `overview.png` - Initial overview
+- `feed_closeup.png` - Item spawn close-up
+- `inspection_top.png` - Detection from above
+- `measurement_side.png` - Side measurement view
+- `routing_wide.png` - Wide routing view
+- `chute_closeup.png` - Chute close-up
+- `result_zone.png` - Exit to destination
+- `c_routing.png` - C-zone routing
+- `d_routing.png` - D-zone routing
+- `mobile_view.png` - Mobile layout
+
+## Test Results
+
+```
+npm run build - SUCCESS
+npm run test - 113 tests passed (11 test files)
+  - cinematicCamera.test.ts: 20 tests
+docker compose up -d --build - SUCCESS
+Browser QA - No console errors
+```
+
+## Limitations
+
+1. **Mobile WebGL**: In headless browser testing, mobile shows fallback due to WebGL not available. Real mobile browsers with WebGL will show the 3D scene.
+
+2. **Camera shake**: Very fast movements may show minor camera jitter. Smoothing factor (0.04) balances responsiveness vs stability.
+
+3. **Manual control resume**: After pausing and manually rotating camera, resuming playback snaps back to cinematic angle.
+
+## Commit Commands
+
+```bash
+git add -A
+git commit -m "feat: cinematic camera playback for 3D demo
+
+- Add cinematicCamera.ts with 9 camera modes
+- Smooth camera transitions with lerp
+- Camera follows item during movement
+- Category-aware routing views (B/C/D)
+- Viewport adaptation (desktop/laptop/mobile)
+- Motion trail for movement feedback
+- Auto camera toggle button
+- 20 unit tests for camera logic"
+git push origin dan_branch
+```

scripts/test_cinematic_camera.py

@@ -0,0 +1,118 @@
+#!/usr/bin/env python3
+"""
+Browser QA script for cinematic camera.
+Takes screenshots at different camera angles during playback.
+"""
+
+import asyncio
+from pathlib import Path
+from playwright.async_api import async_playwright
+
+BASE_URL = "https://arhipovdan.ru"
+SCREENSHOT_DIR = Path(__file__).parent.parent / "docs" / "cinematic_camera_screenshots"
+
+async def main():
+    SCREENSHOT_DIR.mkdir(parents=True, exist_ok=True)
+    
+    async with async_playwright() as p:
+        browser = await p.chromium.launch(headless=True)
+        
+        # Desktop viewport
+        context = await browser.new_context(viewport={"width": 1920, "height": 1080})
+        page = await context.new_page()
+        
+        # Collect console errors
+        errors = []
+        page.on("console", lambda msg: errors.append(msg.text) if msg.type == "error" else None)
+        
+        print("Loading production site...")
+        await page.goto(BASE_URL, wait_until="networkidle", timeout=30000)
+        await asyncio.sleep(2)
+        
+        # Screenshot 1: Overview (initial state)
+        print("Screenshot: overview...")
+        await page.screenshot(path=str(SCREENSHOT_DIR / "overview.png"))
+        
+        # Start playback
+        print("Starting playback...")
+        play_button = page.locator(".play-button, button:has-text('Play')")
+        if await play_button.count() > 0:
+            await play_button.first.click()
+        
+        # Screenshot 2: Feed closeup (spawn phase)
+        await asyncio.sleep(0.5)
+        print("Screenshot: feed_closeup (spawn)...")
+        await page.screenshot(path=str(SCREENSHOT_DIR / "feed_closeup.png"))
+        
+        # Screenshot 3: Inspection top (detection phase)
+        await asyncio.sleep(1.5)
+        print("Screenshot: inspection_top (detection)...")
+        await page.screenshot(path=str(SCREENSHOT_DIR / "inspection_top.png"))
+        
+        # Screenshot 4: Measurement side (measurement phase)
+        await asyncio.sleep(0.8)
+        print("Screenshot: measurement_side (measurement)...")
+        await page.screenshot(path=str(SCREENSHOT_DIR / "measurement_side.png"))
+        
+        # Screenshot 5: Routing wide (command sent + routing)
+        await asyncio.sleep(1.5)
+        print("Screenshot: routing_wide (routing)...")
+        await page.screenshot(path=str(SCREENSHOT_DIR / "routing_wide.png"))
+        
+        # Screenshot 6: Chute closeup (during routing)
+        await asyncio.sleep(0.5)
+        print("Screenshot: chute_closeup...")
+        await page.screenshot(path=str(SCREENSHOT_DIR / "chute_closeup.png"))
+        
+        # Screenshot 7: Result zone (exit phase)
+        await asyncio.sleep(1.0)
+        print("Screenshot: result_zone (exit)...")
+        await page.screenshot(path=str(SCREENSHOT_DIR / "result_zone.png"))
+        
+        # Wait for a few more cases to see C/D routing
+        print("Waiting for C/D routing cases...")
+        await asyncio.sleep(15)
+        await page.screenshot(path=str(SCREENSHOT_DIR / "c_routing.png"))
+        
+        await asyncio.sleep(10)
+        await page.screenshot(path=str(SCREENSHOT_DIR / "d_routing.png"))
+        
+        # Screenshot 8: Mobile viewport
+        print("Testing mobile viewport...")
+        await context.close()
+        context = await browser.new_context(viewport={"width": 390, "height": 844})
+        page = await context.new_page()
+        
+        await page.goto(BASE_URL, wait_until="networkidle", timeout=30000)
+        await asyncio.sleep(2)
+        
+        # Start playback on mobile
+        play_button = page.locator(".play-button, button:has-text('Play')")
+        if await play_button.count() > 0:
+            await play_button.first.click()
+            await asyncio.sleep(3)
+        
+        await page.screenshot(path=str(SCREENSHOT_DIR / "mobile_view.png"))
+        
+        # Check details page
+        print("Checking /details...")
+        await page.goto(f"{BASE_URL}/details", wait_until="networkidle", timeout=30000)
+        await asyncio.sleep(1)
+        await page.screenshot(path=str(SCREENSHOT_DIR / "details_page.png"))
+        
+        await context.close()
+        await browser.close()
+        
+        # Report
+        print(f"\nScreenshots saved to: {SCREENSHOT_DIR}")
+        if errors:
+            print(f"\nConsole errors found ({len(errors)}):")
+            for e in errors[:10]:
+                print(f"  - {e[:100]}")
+        else:
+            print("\nNo console errors found.")
+        
+        print("\nCinematic Camera QA Complete!")
+
+if __name__ == "__main__":
+    asyncio.run(main())

src/components/ThreeD/SorterDigitalTwinContinuous.tsx

@@ -8,10 +8,11 @@
  * - Items ride ON the belt surface
  */
 
-import { Canvas, useFrame, useLoader } from '@react-three/fiber';
+import { Canvas, useFrame, useLoader, useThree } from '@react-three/fiber';
 import { Grid, OrbitControls, Html, Line } from '@react-three/drei';
-import { Suspense, useRef, useMemo, useState } from 'react';
+import { Suspense, useRef, useMemo, useState, useEffect } from 'react';
 import type { Mesh, Group, BufferGeometry } from 'three';
+import * as THREE from 'three';
 import { STLLoader } from 'three/examples/jsm/loaders/STLLoader.js';
 import type { ContinuousPlaybackState, CasePhase } from '../../domain/continuousPlayback';
 import { isDetectionActive, isRoutingActive, getPhaseProgress } from '../../domain/continuousPlayback';
@@ -21,6 +22,13 @@ import { getMeasurementData, shouldShowLaserBeam, shouldShowStepperPulse, should
 import { getModelAsset } from '../../data/modelAssets';
 import { ITEMS } from '../../data/items';
 import type { Category } from '../../domain/types';
+import {
+  getCameraConfig,
+  smoothCameraTransition,
+  getInitialCameraConfig,
+  type CameraConfig,
+  type ViewportType,
+} from '../../domain/cinematicCamera';
 import {
   BELT_TOP_Y,
   BELT_THICKNESS_M,
@@ -47,6 +55,8 @@ export interface SorterDigitalTwinContinuousProps {
   playback: ContinuousPlaybackState;
   simplified?: boolean;
   onContextLost?: () => void;
+  autoCameraEnabled?: boolean;
+  viewportType?: ViewportType;
 }
 
 /** Light color palette */
@@ -79,6 +89,93 @@ const CONVEYOR_END_X = 4.3;
 const CONVEYOR_LENGTH = CONVEYOR_END_X - CONVEYOR_START_X;
 const CONVEYOR_CENTER_X = (CONVEYOR_START_X + CONVEYOR_END_X) / 2;
 
+/** Cinematic camera controller - smoothly transitions between camera angles */
+function CinematicCameraController({ 
+  playback, 
+  enabled, 
+  viewportType = 'desktop' 
+}: { 
+  playback: ContinuousPlaybackState; 
+  enabled: boolean;
+  viewportType: ViewportType;
+}) {
+  const { camera } = useThree();
+  const cameraStateRef = useRef<CameraConfig>(getInitialCameraConfig(viewportType));
+  const isRunning = playback.status === 'running';
+  
+  // Get item position for camera following
+  const itemPosition = useMemo(() => {
+    if (playback.status === 'idle') return null;
+    const pos = getItemPosition(playback);
+    return [pos.x, pos.y, pos.z] as [number, number, number];
+  }, [playback]);
+  
+  useFrame(() => {
+    if (!enabled || !isRunning) return;
+    
+    // Get target camera config for current phase
+    const targetConfig = getCameraConfig(
+      playback.currentPhase,
+      playback.targetCategory,
+      itemPosition,
+      viewportType
+    );
+    
+    // Smooth transition
+    cameraStateRef.current = smoothCameraTransition(
+      cameraStateRef.current,
+      targetConfig,
+      0.04 // Smooth factor - lower = smoother
+    );
+    
+    // Apply to camera
+    const state = cameraStateRef.current;
+    camera.position.set(state.position[0], state.position[1], state.position[2]);
+    camera.lookAt(state.target[0], state.target[1], state.target[2]);
+    
+    // Update FOV if perspective camera
+    if (camera instanceof THREE.PerspectiveCamera) {
+      camera.fov = state.fov;
+      camera.updateProjectionMatrix();
+    }
+  });
+  
+  return null;
+}
+
+/** Subtle motion trail behind moving items */
+function MotionTrail({ 
+  position, 
+  visible, 
+  color,
+  direction 
+}: { 
+  position: [number, number, number]; 
+  visible: boolean;
+  color: string;
+  direction: 'x' | 'z';
+}) {
+  if (!visible) return null;
+  
+  const trailLength = 0.15;
+  const offset = direction === 'x' ? [-trailLength, 0, 0] : [0, 0, -trailLength * Math.sign(position[2] || 1)];
+  
+  return (
+    <mesh position={[position[0] + offset[0], position[1], position[2] + offset[2]]}>
+      <boxGeometry args={[
+        direction === 'x' ? trailLength : 0.08,
+        0.02,
+        direction === 'z' ? trailLength : 0.08
+      ]} />
+      <meshBasicMaterial 
+        color={color} 
+        transparent 
+        opacity={0.3}
+      />
+    </mesh>
+  );
+}
+
 /** Single animated roller that rotates around its own axis */
 function Roller({ position, speedFactor }: { position: [number, number, number]; speedFactor: number }) {
   const meshRef = useRef<Mesh>(null);
@@ -1137,7 +1234,17 @@ function PlaybackItem({ playback }: { playback: ContinuousPlaybackState }) {
 }
 
 /** Main continuous scene - light warehouse style with correct physical dimensions */
-function ContinuousScene({ playback, simplified }: { playback: ContinuousPlaybackState; simplified: boolean }) {
+function ContinuousScene({ 
+  playback, 
+  simplified,
+  autoCameraEnabled,
+  viewportType 
+}: { 
+  playback: ContinuousPlaybackState; 
+  simplified: boolean;
+  autoCameraEnabled: boolean;
+  viewportType: ViewportType;
+}) {
   const speedFactor = getConveyorSpeedFactor(playback);
   const activeRoute = getActiveRoute(playback);
   const category = playback.targetCategory;
@@ -1164,6 +1271,17 @@ function ContinuousScene({ playback, simplified }: { playback: ContinuousPlaybac
   const isRound = itemData.roundness >= 0.7;
   const dims = getRenderedItemDimensions(itemData.dimensionsMm);
   const itemScale = Math.max(dims.width, dims.depth, dims.height);
+  
+  // Motion trail visibility - show during movement phases
+  const showMotionTrail = ['move_to_detection', 'routing', 'exit'].includes(phase) && 
+                          playback.status === 'running';
+  const trailDirection = phase === 'routing' || phase === 'exit' 
+    ? (activeRoute === 'C' || activeRoute === 'D' ? 'z' : 'x') 
+    : 'x';
+  const itemColor = category ? COLORS[`route${category}` as keyof typeof COLORS] : COLORS.sensorAccent;
+  
+  // Cinematic camera active only when running and enabled
+  const cinematicActive = autoCameraEnabled && playback.status === 'running';
 
   return (
     <>
@@ -1279,10 +1397,27 @@ function ContinuousScene({ playback, simplified }: { playback: ContinuousPlaybac
 
       {/* Item riding ON the belt */}
       <PlaybackItem playback={playback} />
+      
+      {/* Motion trail for visual movement feedback */}
+      <MotionTrail 
+        position={itemPos} 
+        visible={showMotionTrail} 
+        color={itemColor}
+        direction={trailDirection as 'x' | 'z'}
+      />
 
+      {/* Cinematic camera controller */}
+      <CinematicCameraController 
+        playback={playback} 
+        enabled={cinematicActive}
+        viewportType={viewportType}
+      />
+
+      {/* OrbitControls - enabled when not in cinematic mode */}
       <OrbitControls
-        enablePan={!simplified}
+        enablePan={!simplified && !cinematicActive}
-        enableZoom
+        enableZoom={!cinematicActive}
+        enableRotate={!cinematicActive}
         maxPolarAngle={Math.PI / 2.1}
         minDistance={3}
         maxDistance={14}
@@ -1297,6 +1432,8 @@ export default function SorterDigitalTwinContinuous({
   playback,
   simplified = false,
   onContextLost,
+  autoCameraEnabled = true,
+  viewportType = 'desktop',
 }: SorterDigitalTwinContinuousProps) {
   return (
     <div className="digital-twin-wrap continuous-twin">
@@ -1316,7 +1453,12 @@ export default function SorterDigitalTwinContinuous({
           }}
         >
           <Suspense fallback={null}>
-            <ContinuousScene playback={playback} simplified={simplified} />
+            <ContinuousScene 
+              playback={playback} 
+              simplified={simplified}
+              autoCameraEnabled={autoCameraEnabled}
+              viewportType={viewportType}
+            />
           </Suspense>
         </Canvas>
       </div>

src/domain/cinematicCamera.test.ts

@@ -0,0 +1,168 @@
+/**
+ * Tests for cinematicCamera module.
+ */
+
+import { describe, it, expect } from 'vitest';
+import {
+  getCameraModeForPhase,
+  getCameraConfig,
+  smoothCameraTransition,
+  isValidCameraConfig,
+  phaseHasCameraMode,
+  getInitialCameraConfig,
+  getAllCameraModes,
+  getViewportType,
+  lerpVector3,
+  lerp,
+} from './cinematicCamera';
+import { CASE_PHASES } from './continuousPlayback';
+import type { Category } from './types';
+
+describe('getCameraModeForPhase', () => {
+  it('returns a mode for every playback phase', () => {
+    for (const phaseConfig of CASE_PHASES) {
+      const mode = getCameraModeForPhase(phaseConfig.phase);
+      expect(mode).toBeTruthy();
+      expect(typeof mode).toBe('string');
+    }
+  });
+
+  it('spawn returns feedCloseup', () => {
+    expect(getCameraModeForPhase('spawn')).toBe('feedCloseup');
+  });
+
+  it('detection returns inspectionTop', () => {
+    expect(getCameraModeForPhase('detection')).toBe('inspectionTop');
+  });
+
+  it('routing returns chuteCloseup', () => {
+    expect(getCameraModeForPhase('routing')).toBe('chuteCloseup');
+  });
+});
+
+describe('getCameraConfig', () => {
+  it('returns valid config for all phases', () => {
+    for (const phaseConfig of CASE_PHASES) {
+      const config = getCameraConfig(phaseConfig.phase, 'B', null, 'desktop');
+      expect(isValidCameraConfig(config)).toBe(true);
+    }
+  });
+
+  it('camera position/target are finite numbers', () => {
+    const config = getCameraConfig('detection', 'B', [0, 0.8, 0], 'desktop');
+    expect(config.position.every(n => Number.isFinite(n))).toBe(true);
+    expect(config.target.every(n => Number.isFinite(n))).toBe(true);
+  });
+
+  it('fov within reasonable range (10-120)', () => {
+    for (const phaseConfig of CASE_PHASES) {
+      const config = getCameraConfig(phaseConfig.phase, 'C', null, 'desktop');
+      expect(config.fov).toBeGreaterThan(10);
+      expect(config.fov).toBeLessThan(120);
+    }
+  });
+
+  it('target category B/C/D maps to routing camera', () => {
+    const categories: Category[] = ['B', 'C', 'D'];
+    for (const cat of categories) {
+      const config = getCameraConfig('routing', cat, null, 'desktop');
+      expect(config.mode).toBe('chuteCloseup');
+      expect(isValidCameraConfig(config)).toBe(true);
+    }
+  });
+
+  it('adjusts for viewport type', () => {
+    const desktop = getCameraConfig('move_to_detection', 'B', null, 'desktop');
+    const mobile = getCameraConfig('move_to_detection', 'B', null, 'mobile');
+    
+    // Mobile should have higher camera and wider FOV
+    expect(mobile.position[1]).toBeGreaterThan(desktop.position[1]);
+    expect(mobile.fov).toBeGreaterThan(desktop.fov);
+  });
+});
+
+describe('smoothCameraTransition', () => {
+  it('interpolates between configs', () => {
+    const current = getCameraConfig('spawn', 'B', null, 'desktop');
+    const target = getCameraConfig('detection', 'B', null, 'desktop');
+    
+    const result = smoothCameraTransition(current, target, 0.5);
+    
+    // Result should be between current and target
+    expect(result.position[0]).toBeGreaterThanOrEqual(
+      Math.min(current.position[0], target.position[0])
+    );
+    expect(result.position[0]).toBeLessThanOrEqual(
+      Math.max(current.position[0], target.position[0])
+    );
+  });
+});
+
+describe('isValidCameraConfig', () => {
+  it('returns true for valid config', () => {
+    const config = getInitialCameraConfig();
+    expect(isValidCameraConfig(config)).toBe(true);
+  });
+
+  it('returns false for invalid fov', () => {
+    const config = { ...getInitialCameraConfig(), fov: 5 };
+    expect(isValidCameraConfig(config)).toBe(false);
+  });
+
+  it('returns false for NaN position', () => {
+    const config = { ...getInitialCameraConfig(), position: [NaN, 0, 0] as [number, number, number] };
+    expect(isValidCameraConfig(config)).toBe(false);
+  });
+});
+
+describe('phaseHasCameraMode', () => {
+  it('returns true for all phases', () => {
+    for (const phaseConfig of CASE_PHASES) {
+      expect(phaseHasCameraMode(phaseConfig.phase)).toBe(true);
+    }
+  });
+});
+
+describe('getViewportType', () => {
+  it('desktop for width >= 1200', () => {
+    expect(getViewportType(1920)).toBe('desktop');
+    expect(getViewportType(1200)).toBe('desktop');
+  });
+
+  it('laptop for width 768-1199', () => {
+    expect(getViewportType(1024)).toBe('laptop');
+    expect(getViewportType(768)).toBe('laptop');
+  });
+
+  it('mobile for width < 768', () => {
+    expect(getViewportType(390)).toBe('mobile');
+    expect(getViewportType(767)).toBe('mobile');
+  });
+});
+
+describe('lerp utilities', () => {
+  it('lerp returns midpoint at t=0.5', () => {
+    expect(lerp(0, 10, 0.5)).toBe(5);
+  });
+
+  it('lerpVector3 works correctly', () => {
+    const a: [number, number, number] = [0, 0, 0];
+    const b: [number, number, number] = [10, 20, 30];
+    const result = lerpVector3(a, b, 0.5);
+    expect(result).toEqual([5, 10, 15]);
+  });
+});
+
+describe('getAllCameraModes', () => {
+  it('returns all defined modes', () => {
+    const modes = getAllCameraModes();
+    expect(modes).toContain('overview');
+    expect(modes).toContain('feedCloseup');
+    expect(modes).toContain('inspectionTop');
+    expect(modes).toContain('measurementSide');
+    expect(modes).toContain('routingWide');
+    expect(modes).toContain('chuteCloseup');
+    expect(modes).toContain('resultZone');
+    expect(modes.length).toBeGreaterThanOrEqual(8);
+  });
+});

src/domain/cinematicCamera.ts

@@ -0,0 +1,301 @@
+/**
+ * Cinematic Camera Director — controls camera angles during demo playback.
+ * Returns camera position, target, and FOV based on current phase and item state.
+ */
+
+import type { CasePhase } from './continuousPlayback';
+import type { Category } from './types';
+import { ZONES, BELT_TOP_Y, CAMERA_RIG } from './physicalLayout';
+
+/** Camera mode names for different shot types. */
+export type CameraMode = 
+  | 'overview'
+  | 'feedCloseup'
+  | 'inspectionTop'
+  | 'measurementSide'
+  | 'classificationTop'
+  | 'routingWide'
+  | 'chuteCloseup'
+  | 'resultZone'
+  | 'nextItemReset';
+
+/** Camera configuration for a specific mode. */
+export interface CameraConfig {
+  position: [number, number, number];
+  target: [number, number, number];
+  fov: number;
+  mode: CameraMode;
+}
+
+/** Viewport type for adaptive camera positions. */
+export type ViewportType = 'desktop' | 'laptop' | 'mobile';
+
+/**
+ * Get viewport type based on screen width.
+ */
+export function getViewportType(width: number): ViewportType {
+  if (width >= 1200) return 'desktop';
+  if (width >= 768) return 'laptop';
+  return 'mobile';
+}
+
+/**
+ * Viewport adjustments for camera height/distance.
+ */
+const VIEWPORT_ADJUSTMENTS: Record<ViewportType, { heightMult: number; distMult: number }> = {
+  desktop: { heightMult: 1.0, distMult: 1.0 },
+  laptop: { heightMult: 1.15, distMult: 1.1 },
+  mobile: { heightMult: 1.3, distMult: 1.25 },
+};
+
+/**
+ * Base camera configurations for each mode.
+ * Positions are relative to the scene center or specific zones.
+ */
+const BASE_CAMERA_CONFIGS: Record<CameraMode, Omit<CameraConfig, 'mode'>> = {
+  overview: {
+    position: [5.0, 3.5, 5.5],
+    target: [0, BELT_TOP_Y, 0],
+    fov: 50,
+  },
+  feedCloseup: {
+    position: [ZONES.A.x + 1.5, 2.0, 2.0],
+    target: [ZONES.A.x, BELT_TOP_Y + 0.1, 0],
+    fov: 45,
+  },
+  inspectionTop: {
+    position: [ZONES.CAMERA.x, CAMERA_RIG.cameraY + 1.5, 2.5],
+    target: [ZONES.CAMERA.x, BELT_TOP_Y + 0.1, 0],
+    fov: 40,
+  },
+  measurementSide: {
+    position: [ZONES.CAMERA.x + 1.8, 1.2, 2.0],
+    target: [ZONES.CAMERA.x, BELT_TOP_Y + 0.2, 0],
+    fov: 42,
+  },
+  classificationTop: {
+    position: [ZONES.CAMERA.x + 0.5, 2.5, 2.2],
+    target: [ZONES.CAMERA.x, BELT_TOP_Y + 0.15, 0],
+    fov: 45,
+  },
+  routingWide: {
+    position: [2.5, 3.0, 4.5],
+    target: [ZONES.GATE.x, BELT_TOP_Y, 0],
+    fov: 55,
+  },
+  chuteCloseup: {
+    position: [ZONES.GATE.x + 0.5, 1.8, 2.8],
+    target: [ZONES.GATE.x + 0.3, BELT_TOP_Y, 0.8],
+    fov: 48,
+  },
+  resultZone: {
+    position: [3.5, 2.5, 3.5],
+    target: [ZONES.B.x - 0.5, 0.5, 0],
+    fov: 52,
+  },
+  nextItemReset: {
+    position: [4.0, 3.0, 4.5],
+    target: [0, BELT_TOP_Y, 0],
+    fov: 50,
+  },
+};
+
+/**
+ * Get camera mode for a given phase.
+ */
+export function getCameraModeForPhase(phase: CasePhase): CameraMode {
+  switch (phase) {
+    case 'spawn':
+      return 'feedCloseup';
+    case 'move_to_detection':
+      return 'overview';
+    case 'detection':
+      return 'inspectionTop';
+    case 'measurement':
+      return 'measurementSide';
+    case 'classification':
+      return 'classificationTop';
+    case 'command_sent':
+      return 'routingWide';
+    case 'routing':
+      return 'chuteCloseup';
+    case 'exit':
+      return 'resultZone';
+    case 'clear_gap':
+      return 'nextItemReset';
+    default:
+      return 'overview';
+  }
+}
+
+/**
+ * Adjust camera position for target category (C/D routing).
+ */
+function adjustForCategory(
+  config: CameraConfig, 
+  category: Category | null, 
+  phase: CasePhase
+): CameraConfig {
+  if (!category || !['routing', 'exit'].includes(phase)) {
+    return config;
+  }
+
+  const adjusted = { ...config, position: [...config.position] as [number, number, number], target: [...config.target] as [number, number, number] };
+  
+  if (category === 'C') {
+    // Look toward C zone (positive Z)
+    adjusted.target[2] = 1.2;
+    adjusted.position[2] = 3.5;
+  } else if (category === 'D') {
+    // Look toward D zone (negative Z)
+    adjusted.target[2] = -1.2;
+    adjusted.position[2] = -2.5;
+    adjusted.position[0] = 3.0;
+  }
+  // B stays on main line, no adjustment needed
+  
+  return adjusted;
+}
+
+/**
+ * Adjust camera for viewport size.
+ */
+function adjustForViewport(
+  config: CameraConfig,
+  viewport: ViewportType
+): CameraConfig {
+  const adj = VIEWPORT_ADJUSTMENTS[viewport];
+  
+  return {
+    ...config,
+    position: [
+      config.position[0] * adj.distMult,
+      config.position[1] * adj.heightMult,
+      config.position[2] * adj.distMult,
+    ],
+    fov: config.fov + (viewport === 'mobile' ? 8 : viewport === 'laptop' ? 4 : 0),
+  };
+}
+
+/**
+ * Get camera configuration for the current playback state.
+ * @param phase Current case phase
+ * @param category Target category (B/C/D)
+ * @param itemPosition Current item position [x, y, z]
+ * @param viewport Viewport type for adaptive positioning
+ * @returns Camera configuration
+ */
+export function getCameraConfig(
+  phase: CasePhase,
+  category: Category | null,
+  itemPosition: [number, number, number] | null,
+  viewport: ViewportType = 'desktop'
+): CameraConfig {
+  const mode = getCameraModeForPhase(phase);
+  const baseConfig = BASE_CAMERA_CONFIGS[mode];
+  
+  let config: CameraConfig = {
+    ...baseConfig,
+    mode,
+  };
+  
+  // Adjust for category-specific routing
+  config = adjustForCategory(config, category, phase);
+  
+  // Adjust for viewport
+  config = adjustForViewport(config, viewport);
+  
+  // Follow item during movement phases
+  if (itemPosition && ['move_to_detection', 'routing', 'exit'].includes(phase)) {
+    // Partially follow item with smoothing factor
+    const followWeight = phase === 'move_to_detection' ? 0.3 : 0.5;
+    config.target = [
+      config.target[0] * (1 - followWeight) + itemPosition[0] * followWeight,
+      config.target[1] * (1 - followWeight) + itemPosition[1] * followWeight,
+      config.target[2] * (1 - followWeight) + itemPosition[2] * followWeight,
+    ];
+  }
+  
+  return config;
+}
+
+/**
+ * Lerp (linear interpolation) between two values.
+ */
+export function lerp(a: number, b: number, t: number): number {
+  return a + (b - a) * t;
+}
+
+/**
+ * Lerp between two 3D vectors.
+ */
+export function lerpVector3(
+  a: [number, number, number],
+  b: [number, number, number],
+  t: number
+): [number, number, number] {
+  return [
+    lerp(a[0], b[0], t),
+    lerp(a[1], b[1], t),
+    lerp(a[2], b[2], t),
+  ];
+}
+
+/**
+ * Smoothly interpolate camera configuration.
+ * @param current Current camera state
+ * @param target Target camera state
+ * @param smoothing Smoothing factor (0-1, lower = smoother)
+ */
+export function smoothCameraTransition(
+  current: CameraConfig,
+  target: CameraConfig,
+  smoothing: number = 0.08
+): CameraConfig {
+  return {
+    position: lerpVector3(current.position, target.position, smoothing),
+    target: lerpVector3(current.target, target.target, smoothing),
+    fov: lerp(current.fov, target.fov, smoothing),
+    mode: target.mode,
+  };
+}
+
+/**
+ * Get initial camera config (overview).
+ */
+export function getInitialCameraConfig(viewport: ViewportType = 'desktop'): CameraConfig {
+  return getCameraConfig('spawn', null, null, viewport);
+}
+
+/**
+ * Validate camera config has finite numbers.
+ */
+export function isValidCameraConfig(config: CameraConfig): boolean {
+  const allFinite = (arr: number[]) => arr.every(n => Number.isFinite(n));
+  return (
+    allFinite(config.position) &&
+    allFinite(config.target) &&
+    Number.isFinite(config.fov) &&
+    config.fov > 10 &&
+    config.fov < 120
+  );
+}
+
+/**
+ * Get all camera modes.
+ */
+export function getAllCameraModes(): CameraMode[] {
+  return Object.keys(BASE_CAMERA_CONFIGS) as CameraMode[];
+}
+
+/**
+ * Check if phase has associated camera mode.
+ */
+export function phaseHasCameraMode(phase: CasePhase): boolean {
+  try {
+    const mode = getCameraModeForPhase(phase);
+    return !!mode && !!BASE_CAMERA_CONFIGS[mode];
+  } catch {
+    return false;
+  }
+}

src/pages/MainPage.tsx

@@ -7,6 +7,7 @@ import { DEMO_PLAYLIST, PLAYLIST_LENGTH } from '../domain/demoPlaylist';
 import type { ContinuousPlaybackState } from '../domain/continuousPlayback';
 import { getCaseProgress, getCurrentPhaseConfig } from '../domain/continuousPlayback';
 import { getMeasurementData, shouldShowMeasurement } from '../domain/measurementSystem';
+import { getViewportType, type ViewportType } from '../domain/cinematicCamera';
 import CVInspectionOverlay from '../components/CVInspectionOverlay';
 
 const SorterDigitalTwinContinuous = lazy(() => import('../components/ThreeD/SorterDigitalTwinContinuous'));
@@ -27,6 +28,7 @@ export default function MainPage({
   const webgl = useWebGLSupport();
   const [width, setWidth] = useState(() => (typeof window === 'undefined' ? 1200 : window.innerWidth));
   const [contextLost, setContextLost] = useState(false);
+  const [autoCameraEnabled, setAutoCameraEnabled] = useState(true);
 
   useEffect(() => {
     const onResize = () => setWidth(window.innerWidth);
@@ -36,6 +38,7 @@ export default function MainPage({
 
   const show3D = prefer3DByDefault(width, webgl && !contextLost);
   const simplified = width < 900;
+  const viewportType: ViewportType = getViewportType(width);
 
   const isRunning = playback.status === 'running';
   const isPaused = playback.status === 'paused';
@@ -74,6 +77,8 @@ export default function MainPage({
                 playback={playback}
                 simplified={simplified}
                 onContextLost={() => setContextLost(true)}
+                autoCameraEnabled={autoCameraEnabled}
+                viewportType={viewportType}
               />
             </Suspense>
           </ThreeErrorBoundary>
@@ -188,6 +193,19 @@ export default function MainPage({
         </div>
       )}
 
+      {/* Auto Camera Toggle - bottom left */}
+      {show3D && (
+        <button 
+          type="button"
+          className="auto-camera-toggle"
+          onClick={() => setAutoCameraEnabled(!autoCameraEnabled)}
+          title={autoCameraEnabled ? 'Disable auto camera to control manually' : 'Enable cinematic auto camera'}
+        >
+          <span className="toggle-icon">{autoCameraEnabled ? '🎬' : '🎥'}</span>
+          <span className="toggle-label">Auto Cam: {autoCameraEnabled ? 'ON' : 'OFF'}</span>
+        </button>
+      )}
+
       {/* Details link - bottom right */}
       <Link to="/details" className="details-link">
         Details →

src/styles.css

@@ -2248,6 +2248,55 @@ button:disabled {
   transition: background 160ms ease, border-color 160ms ease;
 }
 
+/* Auto Camera Toggle */
+.auto-camera-toggle {
+  position: absolute;
+  bottom: 16px;
+  left: 16px;
+  z-index: 10;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  padding: 8px 12px;
+  border: 1px solid rgba(148, 163, 184, 0.3);
+  border-radius: 999px;
+  background: rgba(5, 9, 16, 0.75);
+  backdrop-filter: blur(8px);
+  color: var(--muted);
+  font-size: 11px;
+  font-weight: 600;
+  cursor: pointer;
+  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
+}
+
+.auto-camera-toggle:hover {
+  background: rgba(5, 9, 16, 0.9);
+  border-color: rgba(56, 189, 248, 0.4);
+  color: var(--cyan);
+}
+
+.auto-camera-toggle .toggle-icon {
+  font-size: 14px;
+}
+
+.auto-camera-toggle .toggle-label {
+  text-transform: uppercase;
+  letter-spacing: 0.03em;
+}
+
+@media (max-width: 767px) {
+  .auto-camera-toggle {
+    bottom: 80px;
+    left: 10px;
+    padding: 6px 10px;
+    font-size: 10px;
+  }
+  
+  .auto-camera-toggle .toggle-icon {
+    font-size: 12px;
+  }
+}
+
 .details-link:hover {
   background: rgba(56, 189, 248, 0.1);
   border-color: var(--cyan);