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const puppeteer = require('puppeteer');

const html = `<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Cinematic Motion Graphics</title>
<style>
html,body{
    margin:0;
    overflow:hidden;
    width:100%;
    height:100%;
    background:#050816;
    font-family:Arial,sans-serif;
}
canvas{
    position:fixed;
    inset:0;
}
.overlay{
    position:absolute;
    inset:0;
    display:flex;
    align-items:center;
    justify-content:center;
    pointer-events:none;
}
.title{
    color:white;
    font-size:clamp(2rem,6vw,6rem);
    letter-spacing:.4em;
    text-transform:uppercase;
    mix-blend-mode:screen;
    animation:pulse 6s ease-in-out infinite;
}
@keyframes pulse{
    0%,100%{opacity:.8;transform:scale(1)}
    50%{opacity:1;transform:scale(1.05)}
}
</style>
</head>
<body>
<canvas id="c"></canvas>
<div class="overlay">
    <div class="title">MOTION</div>
</div>
<script>
const canvas=document.getElementById("c");
const ctx=canvas.getContext("2d", { willReadFrequently: true });

let w,h;
function resize(){
  w=canvas.width=window.innerWidth;
  h=canvas.height=window.innerHeight;
}
window.addEventListener("resize",resize);
resize();

const particles=[];
for(let i=0;i<1200;i++){
  particles.push({
    a:Math.random()*Math.PI*2,
    r:50+Math.random()*700,
    s:0.2+Math.random()*2,
    o:Math.random()*Math.PI*2
  });
}

let t=0;
function draw(){
  t+=0.008;

  const g=ctx.createRadialGradient(w/2,h/2,0,w/2,h/2,Math.max(w,h));
  g.addColorStop(0,"#101a45");
  g.addColorStop(.5,"#070b1d");
  g.addColorStop(1,"#020205");
  ctx.fillStyle=g;
  ctx.fillRect(0,0,w,h);

  ctx.save();
  ctx.translate(w/2,h/2);

  particles.forEach((p,i)=>{
    const ang=p.a+t*p.s;
    const rr=p.r*(0.75+0.25*Math.sin(t+p.o));
    const x=Math.cos(ang)*rr;
    const y=Math.sin(ang)*rr;

    const size=1.5+2*Math.sin(t*2+p.o);
    ctx.fillStyle=\`hsla(\${(ang*100+t*300)%360},100%,70%,0.8)\`;
    ctx.beginPath();
    ctx.arc(x,y,Math.abs(size),0,Math.PI*2);
    ctx.fill();
  });

  for(let ring=0; ring<8; ring++){
    ctx.beginPath();
    for(let i=0;i<360;i++){
      const a=i*Math.PI/180;
      const r=140+ring*50+Math.sin(a*6+t*3+ring)*18;
      const x=Math.cos(a+t*0.2*ring)*r;
      const y=Math.sin(a+t*0.2*ring)*r;
      if(i===0) ctx.moveTo(x,y);
      else ctx.lineTo(x,y);
    }
    ctx.closePath();
    ctx.strokeStyle=\`hsla(\${(ring*45+t*120)%360},90%,65%,0.18)\`;
    ctx.lineWidth=2;
    ctx.stroke();
  }

  for(let i=0;i<6;i++){
    const k=i*Math.PI/3;
    ctx.save();
    ctx.rotate(k+t*0.1);
    ctx.lineWidth=1.5;
    ctx.globalAlpha=0.4+0.3*Math.sin(t*2+i);
    ctx.scale(1+(Math.sin(t*3+i)*0.15), 1+(Math.cos(t*3+i+1)*0.15));
    ctx.beginPath();
    for(let j=0;j<200;j++){
      const a=j/200*Math.PI*2;
      const r=260+Math.sin(a*12+t*4+k)*45;
      ctx.lineTo(Math.cos(a)*r,Math.sin(a)*r);
    }
    ctx.closePath();
    ctx.strokeStyle=\`hsla(\${(k*60+t*100)%360},100%,60%,0.25)\`;
    ctx.stroke();
    ctx.restore();
  }

  ctx.restore();
  requestAnimationFrame(draw);
}
draw();
</script>
</body>
</html>`;

(async () => {
  const browser = await puppeteer.launch({ headless: 'new', args: ['--no-sandbox', '--disable-gpu'] });
  const page = await browser.newPage();
  await page.setViewport({ width: 1920, height: 1080 });
  await page.setContent(html);
  
  // Wait 1 second to let it draw
  await new Promise(r => setTimeout(r, 1000));
  
  const w = await page.evaluate(() => window.innerWidth);
  const h = await page.evaluate(() => window.innerHeight);
  const cw = await page.evaluate(() => document.getElementById('c').width);
  console.log('Viewport:', w, h, 'Canvas:', cw);
  
  await page.screenshot({ path: 'test_html.jpg' });
  await browser.close();
})();