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

            (function () {
                "use strict";
                var canvas = document.getElementById("canvas-eta");
                var ctx = canvas.getContext("2d");
                var stage = canvas.parentElement;
                var reduced = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
                var PHI = (1 + Math.sqrt(5)) / 2;
                var RAW = [
                    [0, 1, PHI], [0, 1, -PHI], [0, -1, PHI], [0, -1, -PHI],
                    [1, PHI, 0], [1, -PHI, 0], [-1, PHI, 0], [-1, -PHI, 0],
                    [PHI, 0, 1], [-PHI, 0, 1], [PHI, 0, -1], [-PHI, 0, -1]
                ];
                var VERTS = [], EDGES = [];
                (function () {
                    var i, j, m, d, dx, dy, dz, minD = Infinity;
                    for (i = 0; i < RAW.length; i++) {
                        m = Math.sqrt(RAW[i][0] * RAW[i][0] + RAW[i][1] * RAW[i][1] + RAW[i][2] * RAW[i][2]);
                        VERTS.push([RAW[i][0] / m, RAW[i][1] / m, RAW[i][2] / m]);
                    }
                    for (i = 0; i < VERTS.length; i++) {
                        for (j = i + 1; j < VERTS.length; j++) {
                            dx = VERTS[i][0] - VERTS[j][0];
                            dy = VERTS[i][1] - VERTS[j][1];
                            dz = VERTS[i][2] - VERTS[j][2];
                            d = Math.sqrt(dx * dx + dy * dy + dz * dz);
                            if (d < minD) minD = d;
                        }
                    }
                    for (i = 0; i < VERTS.length; i++) {
                        for (j = i + 1; j < VERTS.length; j++) {
                            dx = VERTS[i][0] - VERTS[j][0];
                            dy = VERTS[i][1] - VERTS[j][1];
                            dz = VERTS[i][2] - VERTS[j][2];
                            d = Math.sqrt(dx * dx + dy * dy + dz * dz);
                            if (d < minD * 1.05) EDGES.push([i, j]);
                        }
                    }
                })();
                var TILT = 0.35, PULSE_MS = 4000;
                var ay = 0, breathT = 0, glow = 0, rings = [], lastPulse = 0;
                var running = false, rafId = null;
                function resize() { canvas.width = stage.clientWidth; canvas.height = stage.clientHeight; }
                function rot(v) {
                    var cy = Math.cos(ay), sy = Math.sin(ay);
                    var cx = Math.cos(TILT), sx = Math.sin(TILT);
                    var x1 = v[0] * cy + v[2] * sy;
                    var z1 = -v[0] * sy + v[2] * cy;
                    var y2 = v[1] * cx - z1 * sx;
                    var z2 = v[1] * sx + z1 * cx;
                    return [x1, y2, z2];
                }
                function project(v, breath) {
                    var R = Math.min(canvas.width, canvas.height) * 0.3 * breath;
                    var persp = 3 / (3 - v[2]);
                    return {
                        x: canvas.width / 2 + v[0] * R * persp,
                        y: canvas.height / 2 + v[1] * R * persp
                    };
                }
                function step() {
                    ay += 0.005;
                    breathT += 0.016;
                    var now = performance.now();
                    if (now - lastPulse >= PULSE_MS) { // heartbeat EVERY 4 SECONDS
                        lastPulse += PULSE_MS;
                        if (now - lastPulse >= PULSE_MS) lastPulse = now;
                        glow = 1;
                        rings.push({ r: 0 });
                        rings.push({ r: -40 });
                        rings.push({ r: -80 });
                    }
                    glow *= 0.93;
                    var maxR = Math.max(canvas.width, canvas.height) * 0.72;
                    for (var i = rings.length - 1; i >= 0; i--) {
                        rings[i].r += 4;
                        if (rings[i].r >= maxR) rings.splice(i, 1);
                    }
                }
                function draw() {
                    var w = canvas.width, h = canvas.height, i;
                    ctx.fillStyle = "#0a0a0f";
                    ctx.fillRect(0, 0, w, h);
                    var breath = 1 + 0.05 * Math.sin(breathT); // subtle breathing ±5%
                    var maxR = Math.max(w, h) * 0.72;
                    for (i = 0; i < rings.length; i++) {
                        if (rings[i].r <= 0) continue;
                        var alpha = 0.5 * (1 - rings[i].r / maxR);
                        ctx.strokeStyle = "rgba(6,182,212," + alpha.toFixed(3) + ")";
                        ctx.lineWidth = 1.4;
                        ctx.beginPath();
                        ctx.arc(w / 2, h / 2, rings[i].r, 0, Math.PI * 2);
                        ctx.stroke();
                    }
                    var proj = [];
                    for (i = 0; i < VERTS.length; i++) proj.push(project(rot(VERTS[i]), breath));
                    var g = Math.min(1, glow);
                    var cr = Math.round(212 + (255 - 212) * g);
                    var cg = Math.round(175 + (255 - 175) * g);
                    var cb = Math.round(55 + (255 - 55) * g);
                    ctx.strokeStyle = "rgba(" + cr + "," + cg + "," + cb + ",0.85)";
                    ctx.lineWidth = 1 + g;
                    for (i = 0; i < EDGES.length; i++) {
                        var a = proj[EDGES[i][0]], b = proj[EDGES[i][1]];
                        ctx.beginPath();
                        ctx.moveTo(a.x, a.y);
                        ctx.lineTo(b.x, b.y);
                        ctx.stroke();
                    }
                    ctx.fillStyle = "rgb(" + cr + "," + cg + "," + cb + ")";
                    for (i = 0; i < proj.length; i++) {
                        ctx.beginPath();
                        ctx.arc(proj[i].x, proj[i].y, 2.2 + g, 0, Math.PI * 2);
                        ctx.fill();
                    }
                }
                function loop() {
                    if (!running) return;
                    step();
                    draw();
                    rafId = requestAnimationFrame(loop);
                }
                function start() {
                    if (running || reduced) return;
                    running = true;
                    lastPulse = performance.now();
                    rafId = requestAnimationFrame(loop);
                }
                function stop() {
                    running = false;
                    if (rafId) cancelAnimationFrame(rafId);
                }
                window.addEventListener("resize", function () { resize(); draw(); });
                resize(); 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();
                    }
                }
            })();