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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Designer 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 drawLissajous(time) {
      ctx.clearRect(0, 0, width, height);

      const centerX = width / 2;
      const centerY = height / 2;
      const scale = 200;
      const a = 7; // frequency X
      const b = 5; // frequency Y
      const delta = time * 0.002;

      for (let i = 0; i < 3; i++) {
        ctx.beginPath();
        const hue = (time / 20 + i * 60) % 360;
        ctx.strokeStyle = hslColor(hue);
        ctx.lineWidth = 2;
        ctx.shadowColor = hslColor(hue);
        ctx.shadowBlur = 25;

        for (let t = 0; t <= Math.PI * 2; t += 0.01) {
          const x = centerX + scale * Math.sin(a * t + delta + i);
          const y = centerY + scale * Math.sin(b * t + i * 0.2);
          if (t === 0) {
            ctx.moveTo(x, y);
          } else {
            ctx.lineTo(x, y);
          }
        }

        ctx.stroke();
      }

      requestAnimationFrame(drawLissajous);
    }

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

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