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

    vec3 bg = vec3(0.02, 0.03, 0.08);
    vec3 gridCol = vec3(0.10, 0.16, 0.32);
    vec3 blue = vec3(0.18, 0.32, 1.0);
    vec3 cyan = vec3(0.28, 0.65, 1.0);

    vec3 col = bg;

    float grid = 0.0;
    grid += smoothstep(0.012, 0.0, abs(fract(p.x * 4.0) - 0.5) / 4.0);
    grid += smoothstep(0.012, 0.0, abs(fract(p.y * 4.0) - 0.5) / 4.0);
    col += gridCol * grid * 0.18;

    float axisX = smoothstep(0.006, 0.0, abs(p.y));
    float axisY = smoothstep(0.006, 0.0, abs(p.x));
    col += vec3(0.20, 0.28, 0.45) * (axisX + axisY);

    float y = cos(p.x * 3.14159 + iTime) * 0.45;
    float d = abs(p.y - y);

    float line = smoothstep(0.018, 0.0, d);
    float glow = 0.025 / max(d, 0.025);

    col += blue * glow * 0.35;
    col += cyan * line;

    fragColor = vec4(col, 1.0);
}