// NextXus Federation — Cognitive Circuitry License
// Animation: Starfall Node Connect
// License: Token Bundle (https://keywebster.gumroad.com/l/olhsf)
// Own the marrow.

            (function () {
                "use strict";
                var canvas = document.getElementById("canvas-gamma");
                var ctx = canvas.getContext("2d");
                var stage = canvas.parentElement;
                var reduced = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
                var COUNT = 90, LINK = 100;
                var stars = [], running = false, rafId = null;

                function makeStar(fromTop) {
                    return {
                        x: Math.random() * canvas.width,
                        y: fromTop ? -10 : Math.random() * canvas.height,
                        vy: 0.2 + Math.random() * 0.4,
                        r: 0.8 + Math.random(),
                        alpha: 0,
                        target: 0.55 + Math.random() * 0.45,
                        phase: Math.random() * Math.PI * 2,
                        amp: 0.3 + Math.random() * 0.5,
                        fading: false
                    };
                }
                function resize() {
                    canvas.width = stage.clientWidth;
                    canvas.height = stage.clientHeight;
                }
                function seed(fromTop) {
                    stars = [];
                    for (var i = 0; i < COUNT; i++) stars.push(makeStar(fromTop));
                    if (!fromTop) {
                        for (var j = 0; j < stars.length; j++) stars[j].alpha = stars[j].target;
                    }
                }
                function draw() {
                    var w = canvas.width, h = canvas.height, i, j, a, b, dx, dy, d;
                    ctx.fillStyle = "#0a0a0f";
                    ctx.fillRect(0, 0, w, h);
                    ctx.lineWidth = 0.5;
                    for (i = 0; i < stars.length; i++) {
                        for (j = i + 1; j < stars.length; j++) {
                            a = stars[i]; b = stars[j];
                            dx = a.x - b.x; dy = a.y - b.y;
                            d = Math.sqrt(dx * dx + dy * dy);
                            if (d < LINK) {
                                ctx.strokeStyle = "rgba(255,255,255," +
                                    ((1 - d / LINK) * 0.22 * Math.min(a.alpha, b.alpha)).toFixed(3) + ")";
                                ctx.beginPath();
                                ctx.moveTo(a.x, a.y);
                                ctx.lineTo(b.x, b.y);
                                ctx.stroke();
                            }
                        }
                    }
                    for (i = 0; i < stars.length; i++) {
                        a = stars[i];
                        ctx.fillStyle = "rgba(255,255,255," + a.alpha.toFixed(3) + ")";
                        ctx.beginPath();
                        ctx.arc(a.x, a.y, a.r, 0, Math.PI * 2);
                        ctx.fill();
                    }
                }
                function step() {
                    var h = canvas.height;
                    for (var i = 0; i < stars.length; i++) {
                        var s = stars[i];
                        s.phase += 0.02;
                        s.x += Math.sin(s.phase) * s.amp * 0.3;
                        s.y += s.vy;
                        if (!s.fading && s.alpha < s.target) s.alpha = Math.min(s.target, s.alpha + 0.01);
                        if (s.y > h - 40) s.fading = true;
                        if (s.fading) {
                            s.alpha -= 0.02;
                            if (s.alpha <= 0) stars[i] = makeStar(true);
                        }
                    }
                }
                function loop() {
                    if (!running) return;
                    step();
                    draw();
                    rafId = requestAnimationFrame(loop);
                }
                function start() {
                    if (running || reduced) return;
                    running = true;
                    rafId = requestAnimationFrame(loop);
                }
                function stop() {
                    running = false;
                    if (rafId) cancelAnimationFrame(rafId);
                }
                window.addEventListener("resize", function () { resize(); seed(false); draw(); });
                resize(); seed(false); draw();
                if (!reduced) {
                    if ("IntersectionObserver" in window) {
                        new IntersectionObserver(function (entries) {
                            entries.forEach(function (e) { if (e.isIntersecting) start(); else stop(); });
                        }).observe(canvas);
                    } else {
                        start();
                    }
                }
            })();