/*{
    "DESCRIPTION": "Slow interference tide lines in teal over deep cobalt. A quiet animated backdrop with a single speed control.",
    "CREDIT": "TaoBot",
    "CATEGORIES": ["Generator", "Backdrop"],
    "INPUTS": [
        {
            "NAME": "speed",
            "LABEL": "Speed",
            "TYPE": "float",
            "DEFAULT": 1.0,
            "MIN": 0.0,
            "MAX": 3.0
        }
    ]
}*/

void main() {
    vec2 uv = gl_FragCoord.xy / RENDERSIZE;
    float t = TIME * speed * 0.35;

    // Layered drifting waves -> interference "tide lines"
    float w1 = sin((uv.x * 6.0 + uv.y * 2.0) + t * 1.7);
    float w2 = sin((uv.y * 9.0 - uv.x * 3.0) - t * 1.3);
    float w3 = sin((uv.x + uv.y) * 14.0 + t * 2.1);
    float tide = (w1 + w2 + w3) / 3.0 * 0.5 + 0.5;

    // Soft banding so the motion reads as lines of light
    float line = smoothstep(0.35, 1.0, tide);

    vec3 cobalt = vec3(0.020, 0.325, 0.784);  // #0553C8 brand royal
    vec3 deep   = vec3(0.012, 0.075, 0.220);  // deep water shadow
    vec3 teal   = vec3(0.060, 0.710, 0.660);  // living teal
    vec3 foam   = vec3(0.620, 0.920, 0.880);  // pale crest

    vec3 col = mix(deep, cobalt, uv.y * 0.7 + tide * 0.2);
    col = mix(col, teal, line * 0.75);
    col = mix(col, foam, pow(line, 6.0) * 0.35);

    // Gentle vignette to keep edges calm behind content
    float vig = smoothstep(1.25, 0.45, length(uv - vec2(0.5, 0.45)));
    col *= mix(0.82, 1.0, vig);

    gl_FragColor = vec4(col, 1.0);
}