precision highp float;

uniform float time;
varying vec2 vUv;

float mandelbrot(vec2 c) {
  vec2 z = c;
  float iterations = 100.0;
  for (float i = 0.0; i < iterations; i++) {
    z = vec2(z.x * z.x - z.y * z.y, 2.0 * z.x * z.y) + c;
    if (length(z) > 2.0) {
      return i / iterations;
    }
  }
  return 0.0;
}

void main() {
  vec2 uv = vUv * vec2(3.0, 2.0) - vec2(2.0, 1.0); // Adjust the Mandelbrot set position and scale
  float mandel = mandelbrot(uv);

  // Color based on Mandelbrot iteration
  vec3 color = vec3(0.0);
  if (mandel > 0.0) {
    color = vec3(1.0 - smoothstep(0.0, 1.0, mandel));
  }

  gl_FragColor = vec4(color, 1.0);
}