'; root.classList.add("intro-playing"); var canvas = intro.querySelector("canvas"); var hud = intro.querySelector(".site-intro-hud"); var ctx = canvas.getContext("2d"); var W, H, cx, cy, small, ui, density; function resize() { var dpr = Math.min(window.devicePixelRatio || 1, 2); W = innerWidth; H = innerHeight; cx = W / 2; cy = H / 2; small = W < 640; ui = Math.min(1, Math.max(0.8, W / 1280)); density = Math.min(1, Math.max(0.7, (W * H) / (1280 * 720))); canvas.width = W * dpr; canvas.height = H * dpr; ctx.setTransform(dpr, 0, 0, dpr, 0, 0); } resize(); addEventListener("resize", resize); var T_SPAWN_END = 2000, T_CONVERGE = 2300, T_BEAM = 3050, T_BLOW = 3450, T_END = 4350; var tokens = [], energy = 0, elapsed = 0, last = performance.now(), done = false, raf, revealed = false; // Adaptive quality: start lighter on low-end devices, drop further if frames are slow. var lowPower = (navigator.hardwareConcurrency || 8) <= 4 || (navigator.deviceMemory || 8) <= 4; var frameCount = 0, slowFrames = 0; // Each expression is rendered once to a small bitmap, then only moved/scaled/faded // per frame (much cheaper than re-drawing text every frame). function sprite(text, size, color) { var dpr = Math.min(window.devicePixelRatio || 1, 2); var c = document.createElement("canvas"), x = c.getContext("2d"); var font = size.toFixed(1) + "px " + mono; x.font = font; var w = Math.ceil(x.measureText(text).width) + 4, h = Math.ceil(size * 1.4); c.width = w * dpr; c.height = h * dpr; x.scale(dpr, dpr); x.font = font; x.fillStyle = color; x.textBaseline = "middle"; x.fillText(text, 2, h / 2); return { img: c, w: w, h: h }; } function spawn() { var x, y; if (Math.random() < 0.7) { var side = (Math.random() * 4) | 0; if (side < 2) { x = side === 0 ? -40 : W + 40; y = Math.random() * H; } else { y = side === 2 ? -30 : H + 30; x = Math.random() * W; } } else { x = Math.random() * W; y = Math.random() * H; if (Math.hypot(x - cx, y - cy) < Math.min(W, H) * 0.25) x = x < cx ? x * 0.4 : W - (W - x) * 0.4; } var a = Math.random() * Math.PI * 2, color; tokens.push({ x: x, y: y, vx: Math.cos(a) * 60, vy: Math.sin(a) * 60, heading: a, turn: (Math.random() - 0.5) * 6, wobble: 0.6 + Math.random() * 2.2, phase: Math.random() * 10, sprite: sprite(expression(small), (11 + Math.random() * 9) * ui, color = pick(PALETTE)), color: color, born: elapsed, alpha: 0, trail: [] }); } function frame(now) { var dt = Math.min(120, now - last); last = now; // catch up after stalls (e.g. hydration) if (++frameCount > 3 && frameCount < 40 && dt > 28 && ++slowFrames > 6) lowPower = true; elapsed += dt; var tsec = dt / 1000; ctx.fillStyle = "rgba(5,7,10," + (elapsed < T_SPAWN_END ? 0.32 : 0.6) + ")"; ctx.fillRect(0, 0, W, H); if (elapsed < T_SPAWN_END) { var n = (34 * (1 - elapsed / T_SPAWN_END) + 6) * density * (lowPower ? 0.55 : 1) * tsec; while (n > 0) { if (Math.random() < n) spawn(); n -= 1; } } var pull = elapsed < T_CONVERGE ? 40 + elapsed * 0.09 : 900 + (elapsed - T_CONVERGE) * 4; ctx.textAlign = "center"; ctx.textBaseline = "middle"; for (var i = tokens.length - 1; i >= 0; i--) { var p = tokens[i]; var dx = cx - p.x, dy = cy - p.y, dist = Math.hypot(dx, dy) || 1; p.turn += (Math.random() - 0.5) * 8 * tsec; p.heading += (p.turn + Math.sin(elapsed / 300 * p.wobble + p.phase) * 3) * tsec; var wander = elapsed < T_CONVERGE ? 140 : 35; p.vx += (Math.cos(p.heading) * wander + (dx / dist) * pull) * tsec; p.vy += (Math.sin(p.heading) * wander + (dy / dist) * pull) * tsec; var damp = Math.pow(0.35, tsec); p.vx *= damp; p.vy *= damp; p.x += p.vx * tsec; p.y += p.vy * tsec; p.alpha = Math.min(1, (elapsed - p.born) / 300); var near = Math.min(1, dist / (Math.min(W, H) * 0.45)); if (!lowPower) { p.trail.push(p.x, p.y); if (p.trail.length > 16) p.trail.splice(0, 2); ctx.strokeStyle = p.color; ctx.globalAlpha = 0.18 * p.alpha; ctx.lineWidth = 1; ctx.beginPath(); for (var k = 0; k < p.trail.length; k += 2) { if (k) ctx.lineTo(p.trail[k], p.trail[k + 1]); else ctx.moveTo(p.trail[k], p.trail[k + 1]); } ctx.stroke(); } var sc = 0.35 + 0.65 * near, sp = p.sprite; ctx.globalAlpha = p.alpha * sc; ctx.drawImage(sp.img, p.x - sp.w * sc / 2, p.y - sp.h * sc / 2, sp.w * sc, sp.h * sc); if (dist < 18) { energy += 1; tokens.splice(i, 1); } } ctx.globalAlpha = 1; var e = Math.min(1, energy / (70 * density)); var coreR = 6 + e * 46 + (elapsed > T_CONVERGE ? (elapsed - T_CONVERGE) * 0.04 : 0); var g = ctx.createRadialGradient(cx, cy, 0, cx, cy, coreR * 3); g.addColorStop(0, "rgba(255,255,255," + (0.35 + e * 0.65) + ")"); g.addColorStop(0.25, "rgba(51,214,224," + (0.25 + e * 0.5) + ")"); g.addColorStop(1, "rgba(46,107,255,0)"); ctx.fillStyle = g; ctx.beginPath(); ctx.arc(cx, cy, coreR * 3, 0, Math.PI * 2); ctx.fill(); if (elapsed > 600 && elapsed < T_BEAM) { ctx.font = "12px " + mono; ctx.fillStyle = "rgba(255,255,255," + (0.4 + e * 0.5) + ")"; ctx.fillText((Math.random() * 10).toFixed(6), cx, cy + coreR * 2 + 14); } if (elapsed > T_BEAM) { var b = Math.min(1, (elapsed - T_BEAM) / (T_BLOW - T_BEAM)); ctx.globalCompositeOperation = "lighter"; var len = Math.max(W, H) * (0.2 + b * 1.2); [[2 + b * 6, 1], [18 + b * 40, 0.25]].forEach(function (wa) { var w = wa[0], al = wa[1]; var hb = ctx.createLinearGradient(cx - len, cy, cx + len, cy); hb.addColorStop(0, "rgba(51,214,224,0)"); hb.addColorStop(0.5, "rgba(255,255,255," + al + ")"); hb.addColorStop(1, "rgba(51,214,224,0)"); ctx.fillStyle = hb; ctx.fillRect(cx - len, cy - w / 2, len * 2, w); var vb = ctx.createLinearGradient(cx, cy - len, cx, cy + len); vb.addColorStop(0, "rgba(46,107,255,0)"); vb.addColorStop(0.5, "rgba(255,255,255," + al * 0.8 + ")"); vb.addColorStop(1, "rgba(46,107,255,0)"); ctx.fillStyle = vb; ctx.fillRect(cx - w / 4, cy - len, w / 2, len * 2); }); var flash = ctx.createRadialGradient(cx, cy, 0, cx, cy, Math.min(W, H) * (0.15 + b * 0.75)); flash.addColorStop(0, "rgba(255,255,255," + 0.85 * b + ")"); flash.addColorStop(1, "rgba(255,255,255,0)"); ctx.fillStyle = flash; ctx.fillRect(0, 0, W, H); ctx.globalCompositeOperation = "source-over"; } var pct = Math.min(100, Math.round(elapsed / T_BEAM * 100)); var loss = Math.max(0.0001, 2.3 * Math.exp(-elapsed / 700)).toFixed(4); hud.textContent = "> evaluating " + (tokens.length + energy) + " expressions\n> loss " + loss + " epoch " + Math.min(99, (elapsed / 35) | 0) + "\n> converging " + pct + "%"; if (elapsed > T_BLOW) { var kk = Math.min(1, (elapsed - T_BLOW) / (T_END - T_BLOW)); var eased = 1 - Math.pow(1 - kk, 3); intro.classList.add("site-intro-blowout"); intro.style.setProperty("--hole", (eased * 150).toFixed(1) + "%"); if (!revealed) { revealed = true; root.classList.add("intro-reveal"); } if (kk >= 1) return finish(); } raf = requestAnimationFrame(frame); } function finish() { if (done) return; done = true; clearTimeout(failsafe); cancelAnimationFrame(raf); removeEventListener("resize", resize); removeEventListener("keydown", finish); intro.removeEventListener("pointerdown", finish); if (!revealed) root.classList.add("intro-reveal"); root.classList.remove("intro-playing"); intro.classList.remove("site-intro-blowout"); intro.innerHTML = ""; setTimeout(function () { root.classList.remove("intro-reveal"); }, 1000); } var failsafe = setTimeout(finish, 7000); // never longer than this, even on a slow phone intro.addEventListener("pointerdown", finish); addEventListener("keydown", finish); ctx.fillStyle = "#05070a"; ctx.fillRect(0, 0, W, H); raf = requestAnimationFrame(frame); })();

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