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4kaudio

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trysem commited on 19 days ago

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ba04ae3

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1 Parent(s): c4834a2

Create m2provisuals-more-options-added

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>4K Transparent Audio Visualizer</title>
+    <script src="https://cdn.tailwindcss.com"></script>
+    <script src="https://unpkg.com/react@18/umd/react.production.min.js" crossorigin></script>
+    <script src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js" crossorigin></script>
+    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
+    <style>
+        body { margin: 0; padding: 0; background-color: #020617; color: #e2e8f0; }
+        /* Custom scrollbar for webkit */
+        ::-webkit-scrollbar { width: 8px; }
+        ::-webkit-scrollbar-track { background: #0f172a; }
+        ::-webkit-scrollbar-thumb { background: #334155; border-radius: 4px; }
+        ::-webkit-scrollbar-thumb:hover { background: #475569; }
+    </style>
+</head>
+<body>
+    <div id="root"></div>
+    <script type="text/babel">
+        const { useState, useRef, useEffect, useCallback } = React;
+        // --- Native SVG Icons ---
+        const Upload = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="17 8 12 3 7 8"/><line x1="12" y1="3" x2="12" y2="15"/></svg>;
+        const Play = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><polygon points="5 3 19 12 5 21 5 3"/></svg>;
+        const Pause = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><rect x="6" y="4" width="4" height="16"/><rect x="14" y="4" width="4" height="16"/></svg>;
+        const ImageIcon = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><rect x="3" y="3" width="18" height="18" rx="2" ry="2"/><circle cx="8.5" cy="8.5" r="1.5"/><polyline points="21 15 16 10 5 21"/></svg>;
+        const Video = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><polygon points="23 7 16 12 23 17 23 7"/><rect x="1" y="5" width="15" height="14" rx="2" ry="2"/></svg>;
+        const Settings2 = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z"/></svg>;
+        const Loader2 = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M21 12a9 9 0 1 1-6.219-8.56"/></svg>;
+        const StopCircle = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><circle cx="12" cy="12" r="10"/><rect x="9" y="9" width="6" height="6"/></svg>;
+        const Sparkles = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="m12 3-1.912 5.813a2 2 0 0 1-1.275 1.275L3 12l5.813 1.912a2 2 0 0 1 1.275 1.275L12 21l1.912-5.813a2 2 0 0 1 1.275-1.275L21 12l-5.813-1.912a2 2 0 0 1-1.275-1.275L12 3Z"/><path d="M5 3v4"/><path d="M19 17v4"/><path d="M3 5h4"/><path d="M17 19h4"/></svg>;
+        const Monitor = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><line x1="8" y1="21" x2="16" y2="21"/><line x1="12" y1="17" x2="12" y2="21"/></svg>;
+        const ImagePlus = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M21 11.5V19a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h7.5"/><path d="m21 15-3.086-3.086a2 2 0 0 0-2.828 0L6 21"/><circle cx="9" cy="9" r="2"/><path d="M19 3v6"/><path d="M16 6h6"/></svg>;
+        const RotateCcw = ({className}) => <svg className={className} xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M3 12a9 9 0 1 0 9-9 9.75 9.75 0 0 0-6.74 2.74L3 8"/><path d="M3 3v5h5"/></svg>;
+        function App() {
+          const canvasRef = useRef(null);
+          const audioRef = useRef(null);
+          const audioCtxRef = useRef(null);
+          const analyserRef = useRef(null);
+          const sourceRef = useRef(null);
+          const destRef = useRef(null);
+          const reqIdRef = useRef(null);
+          const mediaRecorderRef = useRef(null);
+          const chunksRef = useRef([]);
+          const bgImgRef = useRef(null);
+          const dataArrayRef = useRef(new Uint8Array(2048));
+          const lastDrawTimeRef = useRef(0);
+          // State
+          const [audioSrc, setAudioSrc] = useState(null);
+          const [fileName, setFileName] = useState('');
+          const [isPlaying, setIsPlaying] = useState(false);
+          const [isExportingVideo, setIsExportingVideo] = useState(false);
+          const [exportProgress, setExportProgress] = useState(0);
+          // Audio Player State
+          const [audioTime, setAudioTime] = useState(0);
+          const [audioDuration, setAudioDuration] = useState(0);
+          // Settings
+          const [vizType, setVizType] = useState('bars'); // 'bars', 'wave', 'circle'
+          const [color, setColor] = useState('#00ffcc');
+          const [thickness, setThickness] = useState(12);
+          const [spacing, setSpacing] = useState(8);
+          const [sensitivity, setSensitivity] = useState(1.5);
+          const [smoothing, setSmoothing] = useState(0.85);
+          // Transform Settings
+          const [offsetX, setOffsetX] = useState(0);
+          const [offsetY, setOffsetY] = useState(0);
+          const [scale, setScale] = useState(1.0);
+          const [rotation, setRotation] = useState(0);
+          // FIX: Added offset ref to prevent React State thrashing on drag
+          const offsetRef = useRef({ x: 0, y: 0 });
+          // Drag State
+          const [isDragging, setIsDragging] = useState(false);
+          const dragRef = useRef({ startX: 0, startY: 0, initX: 0, initY: 0 });
+          // Advanced Settings
+          const [colorMode, setColorMode] = useState('solid');
+          const [color2, setColor2] = useState('#b829ff');
+          const [glow, setGlow] = useState(false);
+          const [resolution, setResolution] = useState('4k_16_9');
+          const [bgType, setBgType] = useState('transparent');
+          const [bgColor, setBgColor] = useState('#000000');
+          const [bgImageSrc, setBgImageSrc] = useState(null);
+          const [bgImageFit, setBgImageFit] = useState('contain');
+          const [exportFormat, setExportFormat] = useState('mp4');
+          const [exportFps, setExportFps] = useState(30);
+          const playButtonRef = useRef(null);
+          const RESOLUTIONS = {
+            '4k_16_9': { w: 3840, h: 2160, label: '4K (16:9)', isVertical: false },
+            '1080p_16_9': { w: 1920, h: 1080, label: '1080p (16:9)', isVertical: false },
+            '4k_9_16': { w: 2160, h: 3840, label: '4K Vertical (9:16)', isVertical: true },
+            '1080p_9_16': { w: 1080, h: 1920, label: '1080p Vertical (9:16)', isVertical: true }
+          };
+          useEffect(() => {
+            if (bgImageSrc) {
+              const img = new Image();
+              img.onload = () => { bgImgRef.current = img; };
+              img.src = bgImageSrc;
+            } else {
+              bgImgRef.current = null;
+            }
+          }, [bgImageSrc]);
+          const handleBgUpload = (e) => {
+            const file = e.target.files[0];
+            if (file) {
+              if (bgImageSrc) URL.revokeObjectURL(bgImageSrc);
+              setBgImageSrc(URL.createObjectURL(file));
+              setBgType('image');
+            }
+          };
+          const initAudio = useCallback(() => {
+            if (!audioCtxRef.current) {
+              const AudioContext = window.AudioContext || window.webkitAudioContext;
+              audioCtxRef.current = new AudioContext();
+              analyserRef.current = audioCtxRef.current.createAnalyser();
+              destRef.current = audioCtxRef.current.createMediaStreamDestination();
+              if (!sourceRef.current && audioRef.current) {
+                sourceRef.current = audioCtxRef.current.createMediaElementSource(audioRef.current);
+                sourceRef.current.connect(analyserRef.current);
+                analyserRef.current.connect(audioCtxRef.current.destination);
+                analyserRef.current.connect(destRef.current);
+              }
+            }
+            if (audioCtxRef.current.state === 'suspended') {
+              audioCtxRef.current.resume();
+            }
+          }, []);
+          const handleFileUpload = (e) => {
+            const file = e.target.files[0];
+            if (file) {
+              if (audioSrc) URL.revokeObjectURL(audioSrc);
+              const url = URL.createObjectURL(file);
+              setAudioSrc(url);
+              setFileName(file.name);
+              setIsPlaying(false);
+              setAudioTime(0);
+              if (audioRef.current) {
+                audioRef.current.pause();
+                audioRef.current.currentTime = 0;
+              }
+            }
+          };
+          const togglePlay = () => {
+            if (!audioSrc) return;
+            initAudio();
+            if (isPlaying) {
+              audioRef.current.pause();
+            } else {
+              audioRef.current.play();
+            }
+            setIsPlaying(!isPlaying);
+          };
+          const handleTimeUpdate = () => {
+            if (audioRef.current) setAudioTime(audioRef.current.currentTime);
+          };
+          const handleLoadedMetadata = () => {
+            if (audioRef.current) setAudioDuration(audioRef.current.duration);
+          };
+          const handleSeek = (e) => {
+            const time = Number(e.target.value);
+            if (audioRef.current) audioRef.current.currentTime = time;
+            setAudioTime(time);
+          };
+          const formatTime = (time) => {
+            if (isNaN(time)) return "0:00";
+            const m = Math.floor(time / 60);
+            const s = Math.floor(time % 60).toString().padStart(2, '0');
+            return `${m}:${s}`;
+          };
+          const handleMouseDown = (e) => {
+            setIsDragging(true);
+            dragRef.current = {
+              startX: e.clientX,
+              startY: e.clientY,
+              initX: offsetRef.current.x,
+              initY: offsetRef.current.y
+            };
+          };
+          const handleMouseMove = (e) => {
+            if (!isDragging || !canvasRef.current) return;
+            const rect = canvasRef.current.getBoundingClientRect();
+            const deltaX = e.clientX - dragRef.current.startX;
+            const deltaY = e.clientY - dragRef.current.startY;
+            const percentX = (deltaX / rect.width) * 100;
+            const percentY = (deltaY / rect.height) * 100;
+            const newX = Math.max(-50, Math.min(50, dragRef.current.initX + percentX));
+            const newY = Math.max(-50, Math.min(50, dragRef.current.initY + percentY));
+            // FIX: Set the ref so the canvas draws smoothly without tearing down the draw loop
+            offsetRef.current.x = newX;
+            offsetRef.current.y = newY;
+            // Sync UI inputs
+            setOffsetX(newX);
+            setOffsetY(newY);
+          };
+          const handleMouseUpOrLeave = () => {
+            setIsDragging(false);
+          };
+          useEffect(() => {
+            const handleKeyDown = (e) => {
+              if (e.code === 'Space' && e.target.tagName !== 'INPUT' && e.target.tagName !== 'TEXTAREA') {
+                e.preventDefault();
+                playButtonRef.current?.click();
+              }
+            };
+            window.addEventListener('keydown', handleKeyDown);
+            return () => window.removeEventListener('keydown', handleKeyDown);
+          }, []);
+          const draw = useCallback(() => {
+            if (!canvasRef.current) {
+              reqIdRef.current = requestAnimationFrame(draw);
+              return;
+            }
+            const now = performance.now();
+            if (isExportingVideo && exportFps < 60) {
+              const msPerFrame = 1000 / exportFps;
+              if (now - lastDrawTimeRef.current < msPerFrame) {
+                reqIdRef.current = requestAnimationFrame(draw);
+                return;
+              }
+            }
+            lastDrawTimeRef.current = now;
+            const canvas = canvasRef.current;
+            // FIX: Removed `desynchronized: true` as it historically breaks canvas.captureStream()
+            const ctx = canvas.getContext('2d', {
+                alpha: bgType === 'transparent',
+                willReadFrequently: false
+            });
+            const res = RESOLUTIONS[resolution] || RESOLUTIONS['4k_16_9'];
+            if (canvas.width !== res.w || canvas.height !== res.h) {
+               canvas.width = res.w;
+               canvas.height = res.h;
+            }
+            const width = canvas.width;
+            const height = canvas.height;
+            ctx.clearRect(0, 0, width, height);
+            // Draw Background
+            if (bgType === 'color') {
+              ctx.fillStyle = bgColor;
+              ctx.fillRect(0, 0, width, height);
+            } else if (bgType === 'image' && bgImgRef.current) {
+              const img = bgImgRef.current;
+              const imgRatio = img.width / img.height;
+              const canvasRatio = width / height;
+              let drawW, drawH, drawX, drawY;
+              if (bgImageFit === 'stretch') {
+                drawW = width;
+                drawH = height;
+                drawX = 0;
+                drawY = 0;
+              } else if (bgImageFit === 'cover') {
+                if (imgRatio > canvasRatio) {
+                  drawH = height;
+                  drawW = height * imgRatio;
+                  drawX = (width - drawW) / 2;
+                  drawY = 0;
+                } else {
+                  drawW = width;
+                  drawH = width / imgRatio;
+                  drawX = 0;
+                  drawY = (height - drawH) / 2;
+                }
+              } else if (bgImageFit === 'fit-width') {
+                drawW = width;
+                drawH = width / imgRatio;
+                drawX = 0;
+                drawY = (height - drawH) / 2;
+              } else {
+                // contain logic
+                if (imgRatio > canvasRatio) {
+                  drawW = width;
+                  drawH = width / imgRatio;
+                  drawX = 0;
+                  drawY = (height - drawH) / 2;
+                } else {
+                  drawH = height;
+                  drawW = height * imgRatio;
+                  drawX = (width - drawW) / 2;
+                  drawY = 0;
+                }
+              }
+              ctx.drawImage(img, drawX, drawY, drawW, drawH);
+            }
+            if (analyserRef.current) {
+              // Get Audio Data
+              analyserRef.current.smoothingTimeConstant = smoothing;
+              analyserRef.current.fftSize = 2048;
+              const bufferLength = analyserRef.current.frequencyBinCount;
+              const dataArray = dataArrayRef.current;
+              if (vizType === 'bars' || vizType === 'circle') {
+                analyserRef.current.getByteFrequencyData(dataArray);
+              } else if (vizType === 'wave') {
+                analyserRef.current.getByteTimeDomainData(dataArray);
+              }
+              ctx.save();
+              // FIX: Use ref values to position the visualizer, allowing high-performance drag and drop
+              const centerX = width / 2 + (width * (offsetRef.current.x / 100));
+              const centerY = height / 2 + (height * (offsetRef.current.y / 100));
+              ctx.translate(centerX, centerY);
+              ctx.scale(scale, scale);
+              ctx.rotate((rotation * Math.PI) / 180);
+              // Set Colors
+              let activeColor = color;
+              if (colorMode === 'gradient') {
+                const grad = ctx.createLinearGradient(-width/2, -height/2, width/2, height/2);
+                grad.addColorStop(0, color);
+                grad.addColorStop(1, color2);
+                activeColor = grad;
+              } else if (colorMode === 'rainbow') {
+                const grad = ctx.createLinearGradient(-width/2, 0, width/2, 0);
+                grad.addColorStop(0, '#ff0000');
+                grad.addColorStop(0.16, '#ffff00');
+                grad.addColorStop(0.33, '#00ff00');
+                grad.addColorStop(0.5, '#00ffff');
+                grad.addColorStop(0.66, '#0000ff');
+                grad.addColorStop(0.83, '#ff00ff');
+                grad.addColorStop(1, '#ff0000');
+                activeColor = grad;
+              }
+              ctx.strokeStyle = activeColor;
+              ctx.fillStyle = activeColor;
+              ctx.lineCap = 'round';
+              ctx.lineJoin = 'round';
+              // Draw Logic
+              const drawVisualizerPath = () => {
+                ctx.beginPath();
+                if (vizType === 'bars') {
+                  const step = thickness + spacing;
+                  const maxBars = Math.floor((width / 2) / step);
+                  const usefulLength = Math.floor(bufferLength * 0.75);
+                  const numBars = Math.min(maxBars, usefulLength);
+                  for (let i = 0; i < numBars; i++) {
+                    const dataIndex = Math.floor((i / numBars) * usefulLength);
+                    const boost = Math.pow(1 + (i / numBars), 1.5);
+                    const value = dataArray[dataIndex] * boost * sensitivity;
+                    const barHeight = Math.max(thickness / 2, (value / 255) * height * 0.8);
+                    const xOffset = i * step + (step / 2);
+                    ctx.moveTo(xOffset, height / 2 - (thickness / 2));
+                    ctx.lineTo(xOffset, height / 2 - barHeight);
+                    ctx.moveTo(-xOffset, height / 2 - (thickness / 2));
+                    ctx.lineTo(-xOffset, height / 2 - barHeight);
+                  }
+                } else if (vizType === 'wave') {
+                  // FIX: Use fftSize instead of frequencyBinCount to draw the FULL waveform
+                  const fftSize = analyserRef.current.fftSize;
+                  const sliceWidth = width / fftSize;
+                  let x = -width / 2;
+                  for (let i = 0; i < fftSize; i++) {
+                    const normalized = (dataArray[i] / 128.0) - 1;
+                    const y = normalized * sensitivity * (height / 2);
+                    if (i === 0) {
+                      ctx.moveTo(x, y);
+                    } else {
+                      ctx.lineTo(x, y);
+                    }
+                    x += sliceWidth;
+                  }
+                } else if (vizType === 'circle') {
+                  const radius = height / 4;
+                  const circumference = 2 * Math.PI * radius;
+                  const stepSize = thickness + spacing;
+                  const bars = Math.min(180, Math.floor(circumference / stepSize));
+                  const step = (Math.PI * 2) / bars;
+                  for (let i = 0; i < bars; i++) {
+                    const dataIndex = Math.floor((i / bars) * (bufferLength / 2));
+                    const value = (dataArray[dataIndex] / 255) * sensitivity;
+                    const barHeight = Math.max(thickness / 2, value * (height / 3));
+                    const angle = i * step;
+                    const x1 = Math.cos(angle) * radius;
+                    const y1 = Math.sin(angle) * radius;
+                    const x2 = Math.cos(angle) * (radius + barHeight);
+                    const y2 = Math.sin(angle) * (radius + barHeight);
+                    ctx.moveTo(x1, y1);
+                    ctx.lineTo(x2, y2);
+                  }
+                }
+                ctx.stroke();
+                if (vizType === 'circle') {
+                  const radius = height / 4;
+                  ctx.beginPath();
+                  ctx.arc(0, 0, radius - thickness, 0, Math.PI * 2);
+                  const originalWidth = ctx.lineWidth;
+                  ctx.lineWidth = originalWidth / 2;
+                  ctx.stroke();
+                  ctx.lineWidth = originalWidth;
+                }
+              };
+              // Glow logic
+              if (glow) {
+                ctx.globalCompositeOperation = 'lighter';
+                ctx.lineWidth = thickness * 3;
+                ctx.globalAlpha = 0.15;
+                drawVisualizerPath();
+                ctx.lineWidth = thickness * 1.5;
+                ctx.globalAlpha = 0.4;
+                drawVisualizerPath();
+                ctx.lineWidth = thickness;
+                ctx.globalAlpha = 1.0;
+                drawVisualizerPath();
+                ctx.globalCompositeOperation = 'source-over';
+              } else {
+                ctx.lineWidth = thickness;
+                ctx.globalAlpha = 1.0;
+                drawVisualizerPath();
+              }
+              ctx.restore();
+            }
+            reqIdRef.current = requestAnimationFrame(draw);
+          }, [vizType, color, thickness, spacing, sensitivity, smoothing, colorMode, color2, glow, resolution, bgType, bgColor, bgImageFit, scale, rotation, isExportingVideo, exportFps]);
+          useEffect(() => {
+            reqIdRef.current = requestAnimationFrame(draw);
+            return () => cancelAnimationFrame(reqIdRef.current);
+          }, [draw]);
+          const handleAudioEnded = () => {
+            setIsPlaying(false);
+            if (isExportingVideo) stopVideoExport();
+          };
+          const exportImage = () => {
+            if (!canvasRef.current) return;
+            const link = document.createElement('a');
+            link.download = `visualizer_${Date.now()}.png`;
+            link.href = canvasRef.current.toDataURL('image/png');
+            link.click();
+          };
+          const startVideoExport = async () => {
+            if (!audioSrc || !canvasRef.current || !audioCtxRef.current) {
+              alert("Please upload an audio file and press play at least once to initialize.");
+              return;
+            }
+            setIsExportingVideo(true);
+            setExportProgress(0);
+            chunksRef.current = [];
+            audioRef.current.pause();
+            audioRef.current.currentTime = 0;
+            const canvasStream = canvasRef.current.captureStream(exportFps);
+            const audioStream = destRef.current.stream;
+            const combinedTracks = [...canvasStream.getTracks(), ...audioStream.getAudioTracks()];
+            const combinedStream = new MediaStream(combinedTracks);
+            let options = {};
+            let ext = 'webm';
+            const is4k = resolution.startsWith('4k');
+            const targetBitrate = is4k ? 15000000 : 8000000;
+            if (exportFormat === 'mp4') {
+              if (MediaRecorder.isTypeSupported('video/mp4; codecs=h264')) {
+                options = { mimeType: 'video/mp4; codecs=h264', videoBitsPerSecond: targetBitrate };
+                ext = 'mp4';
+              } else if (MediaRecorder.isTypeSupported('video/mp4')) {
+                options = { mimeType: 'video/mp4', videoBitsPerSecond: targetBitrate };
+                ext = 'mp4';
+              } else {
+                alert("Your browser doesn't natively support MP4 export. Falling back to WebM.");
+                options = { mimeType: 'video/webm; codecs=vp9', videoBitsPerSecond: targetBitrate };
+              }
+            } else {
+              options = { mimeType: 'video/webm; codecs=vp9', videoBitsPerSecond: targetBitrate };
+              if (!MediaRecorder.isTypeSupported(options.mimeType)) {
+                options = { mimeType: 'video/webm; codecs=vp8', videoBitsPerSecond: targetBitrate };
+              }
+              if (!MediaRecorder.isTypeSupported(options.mimeType)) {
+                options = { videoBitsPerSecond: targetBitrate };
+              }
+            }
+            try {
+              mediaRecorderRef.current = new MediaRecorder(combinedStream, options);
+            } catch (e) {
+              console.error(e);
+              alert("Error starting video recorder. See console.");
+              setIsExportingVideo(false);
+              return;
+            }
+            mediaRecorderRef.current.ondataavailable = (e) => {
+              if (e.data && e.data.size > 0) chunksRef.current.push(e.data);
+            };
+            mediaRecorderRef.current.onstop = () => {
+              const blob = new Blob(chunksRef.current, { type: mediaRecorderRef.current.mimeType || 'video/mp4' });
+              const url = URL.createObjectURL(blob);
+              const link = document.createElement('a');
+              link.download = `visualizer_${resolution}_${exportFps}fps_${Date.now()}.${ext}`;
+              link.href = url;
+              link.click();
+              URL.revokeObjectURL(url);
+              setIsExportingVideo(false);
+              setExportProgress(0);
+            };
+            const duration = audioRef.current.duration;
+            const progressInterval = setInterval(() => {
+              if (audioRef.current && !audioRef.current.paused) {
+                setExportProgress((audioRef.current.currentTime / duration) * 100);
+              } else {
+                clearInterval(progressInterval);
+              }
+            }, 500);
+            mediaRecorderRef.current.start(1000);
+            await audioRef.current.play();
+            setIsPlaying(true);
+          };
+          const stopVideoExport = () => {
+            if (mediaRecorderRef.current && mediaRecorderRef.current.state !== 'inactive') {
+              mediaRecorderRef.current.stop();
+            }
+            audioRef.current.pause();
+            setIsPlaying(false);
+          };
+          return (
+            <div className="min-h-screen bg-slate-950 text-slate-200 font-sans selection:bg-cyan-500/30 font-sans">
+              <header className="border-b border-slate-800 bg-slate-900/50 p-6 flex items-center justify-between">
+                <div className="flex items-center gap-3">
+                  <div className="bg-cyan-500/20 p-2 rounded-lg">
+                    <Video className="w-6 h-6 text-cyan-400" />
+                  </div>
+                  <h1 className="text-xl font-bold tracking-tight text-white">4K Transparent Visualizer</h1>
+                </div>
+                <div className="text-sm text-slate-400 hidden sm:block">
+                  All processing is strictly local.
+                </div>
+              </header>
+              <main className="container mx-auto p-6 grid lg:grid-cols-12 gap-8">
+                <div className="lg:col-span-4 space-y-6">
+                  <section className="bg-slate-900 p-6 rounded-2xl border border-slate-800 shadow-xl">
+                    <h2 className="text-sm font-semibold uppercase tracking-wider text-slate-500 mb-4 flex items-center gap-2">
+                      <Upload className="w-4 h-4" /> Audio Input
+                    </h2>
+                    <label className="block w-full cursor-pointer bg-slate-800 hover:bg-slate-700 transition-colors border-2 border-dashed border-slate-600 rounded-xl p-8 text-center group">
+                      <input
+                        type="file"
+                        accept="audio/*"
+                        onChange={handleFileUpload}
+                        className="hidden"
+                        disabled={isExportingVideo}
+                      />
+                      <div className="mx-auto w-12 h-12 bg-slate-900 rounded-full flex items-center justify-center mb-3 group-hover:scale-110 transition-transform">
+                        <Upload className="w-6 h-6 text-cyan-400" />
+                      </div>
+                      <p className="font-medium text-slate-300">
+                        {fileName ? fileName : 'Click to browse audio file'}
+                      </p>
+                      <p className="text-xs text-slate-500 mt-2">MP3, WAV, FLAC</p>
+                    </label>
+                    <audio
+                      ref={audioRef}
+                      src={audioSrc}
+                      onEnded={handleAudioEnded}
+                      onPlay={() => setIsPlaying(true)}
+                      onPause={() => setIsPlaying(false)}
+                      onTimeUpdate={handleTimeUpdate}
+                      onLoadedMetadata={handleLoadedMetadata}
+                    />
+                  </section>
+                  <section className="bg-slate-900 p-6 rounded-2xl border border-slate-800 shadow-xl">
+                    <h2 className="text-sm font-semibold uppercase tracking-wider text-slate-500 mb-4 flex items-center gap-2">
+                      <Settings2 className="w-4 h-4" /> Visual Settings
+                    </h2>
+                    <div className="space-y-5">
+                      <div>
+                        <label className="block text-sm font-medium text-slate-400 mb-2">Style</label>
+                        <div className="grid grid-cols-3 gap-2">
+                          {['bars', 'wave', 'circle'].map(type => (
+                            <button
+                              key={type}
+                              onClick={() => setVizType(type)}
+                              className={`py-2 px-3 rounded-lg text-sm font-medium capitalize transition-all ${
+                                vizType === type
+                                  ? 'bg-slate-700 text-white shadow-inner border border-slate-600'
+                                  : 'bg-slate-950 text-slate-400 border border-slate-800 hover:border-slate-600'
+                              }`}
+                            >
+                              {type}
+                            </button>
+                          ))}
+                        </div>
+                      </div>
+                      <div>
+                        <div className="flex justify-between items-center mb-2">
+                          <label className="text-sm font-medium text-slate-400">Color Style</label>
+                          <select
+                            value={colorMode}
+                            onChange={(e) => setColorMode(e.target.value)}
+                            className="bg-slate-950 border border-slate-700 text-slate-300 text-xs rounded px-2 py-1 outline-none"
+                          >
+                            <option value="solid">Solid</option>
+                            <option value="gradient">Gradient</option>
+                            <option value="rainbow">Rainbow</option>
+                          </select>
+                        </div>
+                        <div className="flex items-center gap-3">
+                          {colorMode !== 'rainbow' && (
+                            <input
+                              type="color"
+                              value={color}
+                              onChange={(e) => setColor(e.target.value)}
+                              className="h-10 w-14 rounded cursor-pointer bg-slate-950 border border-slate-700 shrink-0"
+                            />
+                          )}
+                          {colorMode === 'gradient' && (
+                            <>
+                              <span className="text-slate-500 text-xs font-medium">to</span>
+                              <input
+                                type="color"
+                                value={color2}
+                                onChange={(e) => setColor2(e.target.value)}
+                                className="h-10 w-14 rounded cursor-pointer bg-slate-950 border border-slate-700 shrink-0"
+                              />
+                            </>
+                          )}
+                          {colorMode === 'solid' && (
+                            <input
+                              type="text"
+                              value={color}
+                              onChange={(e) => setColor(e.target.value)}
+                              className="flex-1 bg-slate-950 border border-slate-800 rounded-lg px-3 py-2 text-sm focus:ring-1 focus:ring-cyan-500 outline-none uppercase font-mono"
+                            />
+                          )}
+                        </div>
+                      </div>
+                      <div className="flex items-center justify-between bg-slate-950 p-3 rounded-xl border border-slate-800">
+                        <div className="flex items-center gap-2">
+                          <Sparkles className="w-4 h-4 text-amber-400" />
+                          <span className="text-sm font-medium text-slate-300">Neon Glow Effect</span>
+                        </div>
+                        <label className="relative inline-flex items-center cursor-pointer">
+                          <input type="checkbox" checked={glow} onChange={(e) => setGlow(e.target.checked)} className="sr-only peer" />
+                          <div className="w-11 h-6 bg-slate-700 peer-focus:outline-none rounded-full peer peer-checked:after:translate-x-full peer-checked:after:border-white after:content-[''] after:absolute after:top-[2px] after:left-[2px] after:bg-white after:border-gray-300 after:border after:rounded-full after:h-5 after:w-5 after:transition-all peer-checked:bg-cyan-500"></div>
+                        </label>
+                      </div>
+                      <div>
+                        <label className="flex justify-between text-sm font-medium text-slate-400 mb-2">
+                          <span>Line Thickness</span>
+                          <div className="flex items-center gap-2">
+                            <span className="text-slate-500">{thickness}px</span>
+                            <button onClick={() => setThickness(12)} className="text-slate-500 hover:text-cyan-400 transition-colors" title="Reset to Default"><RotateCcw className="w-3 h-3" /></button>
+                          </div>
+                        </label>
+                        <input
+                          type="range"
+                          min="2" max="64"
+                          value={thickness}
+                          onChange={(e) => setThickness(Number(e.target.value))}
+                          className="w-full accent-cyan-500 cursor-pointer"
+                        />
+                      </div>
+                      <div>
+                        <label className="flex justify-between text-sm font-medium text-slate-400 mb-2">
+                          <span>Space Between Lines</span>
+                          <div className="flex items-center gap-2">
+                            <span className="text-slate-500">{spacing}px</span>
+                            <button onClick={() => setSpacing(8)} className="text-slate-500 hover:text-cyan-400 transition-colors" title="Reset to Default"><RotateCcw className="w-3 h-3" /></button>
+                          </div>
+                        </label>
+                        <input
+                          type="range"
+                          min="0" max="64"
+                          value={spacing}
+                          onChange={(e) => setSpacing(Number(e.target.value))}
+                          className="w-full accent-cyan-500 cursor-pointer"
+                        />
+                      </div>
+                      <div>
+                        <label className="flex justify-between text-sm font-medium text-slate-400 mb-2">
+                          <span>Amplitude (Height)</span>
+                          <div className="flex items-center gap-2">
+                            <span className="text-slate-500">{sensitivity.toFixed(1)}x</span>
+                            <button onClick={() => setSensitivity(1.5)} className="text-slate-500 hover:text-cyan-400 transition-colors" title="Reset to Default"><RotateCcw className="w-3 h-3" /></button>
+                          </div>
+                        </label>
+                        <input
+                          type="range"
+                          min="0.5" max="3.0" step="0.1"
+                          value={sensitivity}
+                          onChange={(e) => setSensitivity(Number(e.target.value))}
+                          className="w-full accent-cyan-500 cursor-pointer"
+                        />
+                      </div>
+                      <div>
+                        <label className="flex justify-between text-sm font-medium text-slate-400 mb-2">
+                          <span>Motion Smoothing</span>
+                          <div className="flex items-center gap-2">
+                            <span className="text-slate-500">{Math.round(smoothing * 100)}%</span>
+                            <button onClick={() => setSmoothing(0.85)} className="text-slate-500 hover:text-cyan-400 transition-colors" title="Reset to Default"><RotateCcw className="w-3 h-3" /></button>
+                          </div>
+                        </label>
+                        <input
+                          type="range"
+                          min="0.1" max="0.99" step="0.01"
+                          value={smoothing}
+                          onChange={(e) => setSmoothing(Number(e.target.value))}
+                          className="w-full accent-cyan-500 cursor-pointer"
+                        />
+                      </div>
+                      <div className="pt-4 mt-4 border-t border-slate-800 space-y-5">
+                        <h3 className="text-xs font-semibold uppercase tracking-wider text-slate-500 mb-2">Transform & Position</h3>
+                        <div>
+                          <label className="flex justify-between text-sm font-medium text-slate-400 mb-2">
+                            <span>Size (Scale)</span>
+                            <div className="flex items-center gap-2">
+                              <span className="text-slate-500">{scale.toFixed(2)}x</span>
+                              <button onClick={() => setScale(1.0)} className="text-slate-500 hover:text-cyan-400 transition-colors" title="Reset to Default"><RotateCcw className="w-3 h-3" /></button>
+                            </div>
+                          </label>
+                          <input
+                            type="range"
+                            min="0.1" max="3.0" step="0.1"
+                            value={scale}
+                            onChange={(e) => setScale(Number(e.target.value))}
+                            className="w-full accent-cyan-500 cursor-pointer"
+                          />
+                        </div>
+                        <div>
+                          <label className="flex justify-between text-sm font-medium text-slate-400 mb-2">
+                            <span>Rotation</span>
+                            <div className="flex items-center gap-2">
+                              <span className="text-slate-500">{rotation}°</span>
+                              <button onClick={() => setRotation(0)} className="text-slate-500 hover:text-cyan-400 transition-colors" title="Reset to Default"><RotateCcw className="w-3 h-3" /></button>
+                            </div>
+                          </label>
+                          <input
+                            type="range"
+                            min="0" max="360" step="1"
+                            value={rotation}
+                            onChange={(e) => setRotation(Number(e.target.value))}
+                            className="w-full accent-cyan-500 cursor-pointer"
+                          />
+                        </div>
+                        <div>
+                          <label className="flex justify-between text-sm font-medium text-slate-400 mb-2">
+                            <span>Horizontal Position</span>
+                            <div className="flex items-center gap-2">
+                              <span className="text-slate-500">{Math.round(offsetX)}%</span>
+                              <button onClick={() => { setOffsetX(0); offsetRef.current.x = 0; }} className="text-slate-500 hover:text-cyan-400 transition-colors" title="Reset to Default"><RotateCcw className="w-3 h-3" /></button>
+                            </div>
+                          </label>
+                          <input
+                            type="range"
+                            min="-50" max="50" step="1"
+                            value={offsetX}
+                            onChange={(e) => {
+                              const val = Number(e.target.value);
+                              setOffsetX(val);
+                              offsetRef.current.x = val;
+                            }}
+                            className="w-full accent-cyan-500 cursor-pointer"
+                          />
+                        </div>
+                        <div>
+                          <label className="flex justify-between text-sm font-medium text-slate-400 mb-2">
+                            <span>Vertical Position</span>
+                            <div className="flex items-center gap-2">
+                              <span className="text-slate-500">{Math.round(offsetY)}%</span>
+                              <button onClick={() => { setOffsetY(0); offsetRef.current.y = 0; }} className="text-slate-500 hover:text-cyan-400 transition-colors" title="Reset to Default"><RotateCcw className="w-3 h-3" /></button>
+                            </div>
+                          </label>
+                          <input
+                            type="range"
+                            min="-50" max="50" step="1"
+                            value={offsetY}
+                            onChange={(e) => {
+                              const val = Number(e.target.value);
+                              setOffsetY(val);
+                              offsetRef.current.y = val;
+                            }}
+                            className="w-full accent-cyan-500 cursor-pointer"
+                          />
+                        </div>
+                      </div>
+                    </div>
+                  </section>
+                  <section className="bg-slate-900 p-6 rounded-2xl border border-slate-800 shadow-xl">
+                    <h2 className="text-sm font-semibold uppercase tracking-wider text-slate-500 mb-4 flex items-center gap-2">
+                      <Monitor className="w-4 h-4" /> Output Setup
+                    </h2>
+                    <div className="space-y-5">
+                      <div>
+                        <label className="block text-sm font-medium text-slate-400 mb-2">Aspect Ratio & Resolution</label>
+                        <select
+                          value={resolution}
+                          onChange={(e) => setResolution(e.target.value)}
+                          disabled={isExportingVideo}
+                          className="w-full bg-slate-950 border border-slate-700 text-slate-300 text-sm rounded-lg px-3 py-2.5 outline-none focus:ring-1 focus:ring-cyan-500 disabled:opacity-50 disabled:cursor-not-allowed"
+                        >
+                          <option value="4k_16_9">4K Landscape (3840x2160)</option>
+                          <option value="1080p_16_9">1080p Landscape (1920x1080)</option>
+                          <option value="4k_9_16">4K Vertical / Reels (2160x3840)</option>
+                          <option value="1080p_9_16">1080p Vertical / Reels (1080x1920)</option>
+                        </select>
+                      </div>
+                      <div>
+                        <label className="block text-sm font-medium text-slate-400 mb-2">Background Type</label>
+                        <div className="flex gap-2 mb-3">
+                          {['transparent', 'color', 'image'].map(type => (
+                            <button
+                              key={type}
+                              onClick={() => setBgType(type)}
+                              className={`flex-1 py-2 px-2 rounded-lg text-xs font-medium capitalize transition-all ${
+                                bgType === type
+                                  ? 'bg-slate-700 text-white shadow-inner border border-slate-600'
+                                  : 'bg-slate-950 text-slate-400 border border-slate-800 hover:border-slate-600'
+                              }`}
+                            >
+                              {type}
+                            </button>
+                          ))}
+                        </div>
+                        {bgType === 'color' && (
+                          <div className="flex items-center gap-3 mt-2 bg-slate-950 p-2 rounded-lg border border-slate-800">
+                            <input type="color" value={bgColor} onChange={(e) => setBgColor(e.target.value)} className="h-8 w-12 rounded cursor-pointer bg-slate-950 border border-slate-700" />
+                            <span className="text-sm font-mono text-slate-400 uppercase">{bgColor}</span>
+                          </div>
+                        )}
+                        {bgType === 'image' && (
+                          <div className="mt-2 space-y-3">
+                            <label className="flex items-center justify-center gap-2 w-full cursor-pointer bg-slate-950 hover:bg-slate-800 transition-colors border border-dashed border-slate-600 rounded-lg p-3 text-center text-sm text-slate-300">
+                              <ImagePlus className="w-4 h-4" />
+                              {bgImageSrc ? 'Change Image' : 'Upload Background Image'}
+                              <input type="file" accept="image/*" onChange={handleBgUpload} className="hidden" />
+                            </label>
+                            {bgImageSrc && (
+                              <div className="flex justify-between items-center bg-slate-950 p-2 rounded-lg border border-slate-800">
+                                <span className="text-xs font-medium text-slate-400">Image Fit</span>
+                                <select
+                                  value={bgImageFit}
+                                  onChange={(e) => setBgImageFit(e.target.value)}
+                                  className="bg-slate-900 border border-slate-700 text-slate-300 text-xs rounded px-2 py-1 outline-none"
+                                >
+                                  <option value="contain">Contain (No Crop)</option>
+                                  <option value="cover">Cover (Fill Canvas)</option>
+                                  <option value="fit-width">Fit to Width</option>
+                                  <option value="stretch">Stretch (Exact Fit)</option>
+                                </select>
+                              </div>
+                            )}
+                          </div>
+                        )}
+                      </div>
+                    </div>
+                  </section>
+                  <section className="bg-slate-900 p-6 rounded-2xl border border-slate-800 shadow-xl">
+                    <h2 className="text-sm font-semibold uppercase tracking-wider text-slate-500 mb-4">Export Options</h2>
+                    <div className="flex flex-col gap-3">
+                      <div className="bg-slate-950 p-4 rounded-xl border border-slate-800 mb-2">
+                        <label className="block text-sm font-medium text-slate-400 mb-2">Video Format & Framerate</label>
+                        <div className="flex flex-col 2xl:flex-row gap-3">
+                          <select
+                            value={exportFormat}
+                            onChange={(e) => setExportFormat(e.target.value)}
+                            className="w-full bg-slate-900 border border-slate-700 text-slate-300 text-sm rounded-lg px-3 py-2.5 outline-none focus:ring-1 focus:ring-cyan-500"
+                          >
+                            <option value="webm">WebM (Transparent)</option>
+                            <option value="mp4">MP4 (Solid BG / DaVinci)</option>
+                          </select>
+                          <select
+                            value={exportFps}
+                            onChange={(e) => setExportFps(Number(e.target.value))}
+                            className="w-full 2xl:w-32 bg-slate-900 border border-slate-700 text-slate-300 text-sm rounded-lg px-3 py-2.5 outline-none focus:ring-1 focus:ring-cyan-500"
+                          >
+                            <option value={30}>30 FPS</option>
+                            <option value={60}>60 FPS</option>
+                          </select>
+                        </div>
+                        <div className="mt-3 p-3 bg-red-500/10 border border-red-500/20 rounded-lg">
+                          <p className="text-xs text-red-400 leading-relaxed">
+                            <strong>Video Freezing/Crashing?</strong> Real-time 4K encoding is extremely heavy. To fix this:<br/>
+                            1. Set Framerate to <strong>30 FPS</strong>.<br/>
+                            2. Turn off <strong>Neon Glow Effect</strong> (massive performance boost).<br/>
+                            3. Lower Resolution to <strong>1080p</strong>.
+                          </p>
+                        </div>
+                        {exportFormat === 'mp4' && (
+                          <div className="mt-3 p-3 bg-amber-500/10 border border-amber-500/20 rounded-lg">
+                            <p className="text-xs text-amber-500/90 leading-relaxed">
+                              <strong>DaVinci Resolve Tip:</strong> MP4s cannot be transparent. Set your Background Type to <strong>Color (Black)</strong>, export the MP4, and in DaVinci, set your clip's Composite Mode to <strong>Screen</strong> or <strong>Add</strong>.
+                            </p>
+                          </div>
+                        )}
+                      </div>
+                      <button
+                        onClick={exportImage}
+                        disabled={isExportingVideo}
+                        className="w-full bg-slate-800 hover:bg-slate-700 text-white font-medium py-3 px-4 rounded-xl flex items-center justify-center gap-2 transition-colors disabled:opacity-50"
+                      >
+                        <ImageIcon className="w-4 h-4" />
+                        Save Snapshot (PNG)
+                      </button>
+                      {isExportingVideo ? (
+                        <div className="w-full space-y-3">
+                          <button
+                            onClick={stopVideoExport}
+                            className="w-full bg-red-500/10 hover:bg-red-500/20 text-red-500 border border-red-500/20 font-bold py-3 px-4 rounded-xl flex items-center justify-center gap-2 transition-colors"
+                          >
+                            <StopCircle className="w-5 h-5" />
+                            Stop & Save
+                          </button>
+                          <div className="w-full bg-slate-950 rounded-full h-2.5 border border-slate-800 overflow-hidden">
+                            <div className="bg-cyan-500 h-2.5 rounded-full transition-all duration-300" style={{ width: `${exportProgress}%` }}></div>
+                          </div>
+                          <p className="text-xs text-center text-slate-400">Recording video... {Math.round(exportProgress)}%</p>
+                        </div>
+                      ) : (
+                        <button
+                          onClick={startVideoExport}
+                          disabled={!audioSrc}
+                          className="w-full bg-gradient-to-r from-indigo-500 to-cyan-500 hover:from-indigo-400 hover:to-cyan-400 text-white font-bold py-3 px-4 rounded-xl flex items-center justify-center gap-2 transition-all shadow-lg shadow-cyan-500/20 disabled:opacity-50 disabled:shadow-none"
+                        >
+                          <Video className="w-5 h-5" />
+                          Export Video ({exportFormat.toUpperCase()})
+                        </button>
+                      )}
+                    </div>
+                  </section>
+                </div>
+                <div className="lg:col-span-8 flex flex-col gap-4 lg:sticky lg:top-6 lg:h-[calc(100vh-3rem)]">
+                  <div className="bg-slate-900 rounded-2xl border border-slate-800 shadow-xl overflow-hidden flex-1 relative flex flex-col min-h-0">
+                    <div className="p-4 border-b border-slate-800 bg-slate-900/80 flex justify-between items-center z-10 shrink-0">
+                      <span className="text-sm font-semibold text-slate-300 flex items-center gap-2">
+                        Live Preview
+                        <span className="bg-slate-800 text-xs px-2 py-0.5 rounded text-slate-400 border border-slate-700">
+                          {RESOLUTIONS[resolution]?.w}x{RESOLUTIONS[resolution]?.h}
+                        </span>
+                      </span>
+                      <span className="text-xs text-slate-500">
+                        {bgType === 'transparent' ? 'Checkerboard denotes transparency' : 'Background included in export'}
+                      </span>
+                    </div>
+                    <div
+                      className="flex-1 w-full relative flex items-center justify-center p-4 sm:p-6 overflow-hidden bg-black/50 min-h-0"
+                      style={ bgType === 'transparent' ? {
+                        backgroundImage: 'repeating-linear-gradient(45deg, #0f172a 25%, transparent 25%, transparent 75%, #0f172a 75%, #0f172a), repeating-linear-gradient(45deg, #0f172a 25%, #1e293b 25%, #1e293b 75%, #0f172a 75%, #0f172a)',
+                        backgroundPosition: '0 0, 10px 10px',
+                        backgroundSize: '20px 20px'
+                      } : {}}
+                    >
+                      {/* FIX: Added `key` prop so context attributes are strictly respected upon background change */}
+                      <canvas
+                        key={bgType === 'transparent' ? 'alpha' : 'solid'}
+                        ref={canvasRef}
+                        width={RESOLUTIONS[resolution]?.w || 3840}
+                        height={RESOLUTIONS[resolution]?.h || 2160}
+                        onMouseDown={handleMouseDown}
+                        onMouseMove={handleMouseMove}
+                        onMouseUp={handleMouseUpOrLeave}
+                        onMouseLeave={handleMouseUpOrLeave}
+                        className={`max-w-full max-h-full object-contain drop-shadow-2xl rounded-lg ring-1 ring-white/10 bg-transparent ${RESOLUTIONS[resolution]?.isVertical ? 'aspect-[9/16]' : 'aspect-video'} ${isDragging ? 'cursor-grabbing' : 'cursor-grab'}`}
+                      />
+                      {!audioSrc && (
+                        <div className="absolute inset-0 flex flex-col items-center justify-center pointer-events-none bg-slate-900/80 backdrop-blur-sm z-20">
+                          <Loader2 className="w-12 h-12 text-slate-500 animate-spin mb-4 opacity-50" />
+                          <p className="text-slate-400 font-medium">Awaiting Audio Input</p>
+                        </div>
+                      )}
+                    </div>
+                  </div>
+                  <div className="bg-slate-900 p-4 sm:p-5 rounded-2xl border border-slate-800 shadow-xl shrink-0 flex flex-col gap-3">
+                    <div className="flex items-center gap-4">
+                      <button
+                        ref={playButtonRef}
+                        onClick={togglePlay}
+                        disabled={!audioSrc || isExportingVideo}
+                        className="w-12 h-12 shrink-0 bg-cyan-500 hover:bg-cyan-400 text-slate-950 rounded-full flex items-center justify-center transition-colors disabled:opacity-50 disabled:hover:bg-cyan-500"
+                      >
+                        {isPlaying ? <Pause className="w-6 h-6 fill-current" /> : <Play className="w-6 h-6 fill-current ml-1" />}
+                      </button>
+                      <div className="flex-1 flex flex-col gap-2">
+                        <div className="flex justify-between text-xs font-mono text-slate-400">
+                          <span>{formatTime(audioTime)}</span>
+                          <span className="text-slate-300 font-sans truncate px-4">{fileName || 'No audio selected'}</span>
+                          <span>{formatTime(audioDuration)}</span>
+                        </div>
+                        <input
+                          type="range"
+                          min="0"
+                          max={audioDuration || 100}
+                          value={audioTime}
+                          onChange={handleSeek}
+                          disabled={!audioSrc || isExportingVideo}
+                          className="w-full accent-cyan-500 cursor-pointer h-2 bg-slate-800 rounded-lg appearance-none [&::-webkit-slider-thumb]:appearance-none [&::-webkit-slider-thumb]:w-4 [&::-webkit-slider-thumb]:h-4 [&::-webkit-slider-thumb]:bg-cyan-400 [&::-webkit-slider-thumb]:rounded-full"
+                        />
+                      </div>
+                    </div>
+                  </div>
+                </div>
+              </main>
+            </div>
+          );
+        }
+        const root = ReactDOM.createRoot(document.getElementById('root'));
+        root.render(<App />);
+    </script>
+</body>
+</html>