// NextXus Federation — Cognitive Circuitry License
// Animation: The 3D Neural Constellation
// License: Token Bundle (https://keywebster.gumroad.com/l/olhsf)
// Own the marrow.

            (function () {
                "use strict";
                var canvas = document.getElementById("canvas-delta");
                var ctx = canvas.getContext("2d");
                var stage = canvas.parentElement;
                var reduced = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
                var COUNT = 135, MAXZ = 1000, FOCAL = 300, LINK2D = 100, SPEED = 1.4;
                var stars = [], running = false, rafId = null;
                function makeStar(deep) {
                    return {
                        x: (Math.random() - 0.5) * 1600,
                        y: (Math.random() - 0.5) * 1000,
                        z: deep ? MAXZ : 1 + Math.random() * MAXZ
                    };
                }
                function resize() { canvas.width = stage.clientWidth; canvas.height = stage.clientHeight; }
                function seed() {
                    stars = [];
                    for (var i = 0; i < COUNT; i++) stars.push(makeStar(false));
                }
                function draw() {
                    var w = canvas.width, h = canvas.height, i, j;
                    ctx.fillStyle = "#0a0a0f";
                    ctx.fillRect(0, 0, w, h);
                    var pts = [];
                    for (i = 0; i < stars.length; i++) {
                        var k = FOCAL / stars[i].z;
                        pts.push({
                            x: w / 2 + stars[i].x * k,
                            y: h / 2 + stars[i].y * k,
                            k: k,
                            t: 1 - stars[i].z / MAXZ
                        });
                    }
                    // SCREEN-SPACE constellations: temporary luminous gold links.
                    ctx.lineWidth = 0.7;
                    for (i = 0; i < pts.length; i++) {
                        if (pts[i].x < 0 || pts[i].x > w || pts[i].y < 0 || pts[i].y > h) continue;
                        for (j = i + 1; j < pts.length; j++) {
                            var dx = pts[i].x - pts[j].x, dy = pts[i].y - pts[j].y;
                            var d = Math.sqrt(dx * dx + dy * dy);
                            if (d < LINK2D) {
                                ctx.strokeStyle = "rgba(255,215,0," +
                                    ((1 - d / LINK2D) * 0.32 * Math.min(pts[i].t, pts[j].t) + 0.02).toFixed(3) + ")";
                                ctx.beginPath();
                                ctx.moveTo(pts[i].x, pts[i].y);
                                ctx.lineTo(pts[j].x, pts[j].y);
                                ctx.stroke();
                            }
                        }
                    }
                    for (i = 0; i < pts.length; i++) {
                        var t = pts[i].t;
                        var g = Math.round(255 - 40 * t), b = Math.round(255 * (1 - t));
                        ctx.fillStyle = "rgba(255," + g + "," + b + "," + (0.25 + 0.75 * t).toFixed(3) + ")";
                        var r = Math.min(4, 0.4 + 1.3 * pts[i].k);
                        ctx.beginPath();
                        ctx.arc(pts[i].x, pts[i].y, r, 0, Math.PI * 2);
                        ctx.fill();
                    }
                }
                function step() {
                    for (var i = 0; i < stars.length; i++) {
                        stars[i].z -= SPEED;
                        if (stars[i].z <= 1) 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(); draw(); });
                resize(); seed(); 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();
                    }
                }
            })();