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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Circular Lissajous Glow</title>
  <style>
    html, body {
      margin: 0;
      padding: 0;
      overflow: hidden;
      background: radial-gradient(circle at center, #000010, #000000);
    }
    canvas {
      display: block;
    }
  </style>
</head>
<body>
  <canvas id="canvas"></canvas>

  <script>
    const canvas = document.getElementById("canvas");
    const ctx = canvas.getContext("2d");

    let width = canvas.width = window.innerWidth;
    let height = canvas.height = window.innerHeight;

    window.addEventListener("resize", () => {
      width = canvas.width = window.innerWidth;
      height = canvas.height = window.innerHeight;
    });

    function hslColor(hue) {
      return `hsl(${hue}, 100%, 60%)`;
    }

    function drawCircularLoop(time) {
      ctx.clearRect(0, 0, width, height);

      const centerX = width / 2;
      const centerY = height / 2;
      const radius = 120; // orbit radius
      const loops = 12;   // number of petals
      const amp = 80;     // amplitude (petal depth)
      const speed = time * 0.002;

      ctx.beginPath();
      ctx.lineWidth = 2;
      ctx.strokeStyle = hslColor(speed * 100 % 360);
      ctx.shadowColor = ctx.strokeStyle;
      ctx.shadowBlur = 30;

      for (let angle = 0; angle <= Math.PI * 2; angle += 0.01) {
        const r = radius + Math.sin(angle * loops + speed) * amp;
        const x = centerX + Math.cos(angle) * r;
        const y = centerY + Math.sin(angle) * r;

        if (angle === 0) ctx.moveTo(x, y);
        else ctx.lineTo(x, y);
      }

      ctx.closePath();
      ctx.stroke();

      requestAnimationFrame(drawCircularLoop);
    }

    drawCircularLoop(0);
  </script>
</body>
</html>

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