void mainImage(out vec4 fragColor, in vec2 fragCoord) {
    vec2 uv = fragCoord.xy / iResolution.xy;
    vec2 p = uv * 2.0 - 1.0;
    p.x *= uAspect;

    vec2 m = uPointer * 2.0 - 1.0;
    m.x *= uAspect;

    vec2 delta = uPointerDelta * vec2(uAspect, 1.0);
    float t = iTime;

    float d = length(p - m);
    float influence = exp(-d * 4.5);

    vec2 q = p;
    q += delta * influence * 22.0;
    q += 0.08 * vec2(
        sin(q.y * 7.0 + t * 1.4),
        cos(q.x * 6.0 - t * 1.1)
    );

    float bands = sin(q.x * 10.0 + sin(q.y * 5.0 + t) * 2.0 + t);
    bands += sin(q.y * 13.0 - t * 1.2);
    bands += sin((q.x + q.y) * 8.0 + t * 0.8);
    bands /= 3.0;

    float signal = smoothstep(0.15, 0.95, bands * 0.5 + 0.5);

    float pulse = sin(d * 42.0 - t * 8.0);
    pulse = smoothstep(0.25, 1.0, pulse * 0.5 + 0.5);
    pulse *= influence;

    float click = uPointerDown * exp(-d * 7.0);

    vec3 deep = vec3(0.01, 0.015, 0.045);
    vec3 blue = vec3(0.06, 0.28, 1.0);
    vec3 cyan = vec3(0.18, 0.75, 1.0);
    vec3 magenta = vec3(0.72, 0.15, 1.0);

    vec3 col = deep;
    col += blue * signal * 0.45;
    col += cyan * pulse * 0.65;
    col += magenta * click * 0.85;
    col += cyan * (0.012 / max(d, 0.012)) * 0.14;

    col *= 1.0 - length(p / vec2(uAspect, 1.0)) * 0.18;
    col = pow(col, vec3(0.88));

    fragColor = vec4(col, 1.0);
}