(function() { function twinkle() { var logo = document.getElementById(‘k4-logo’); if (!logo) return; var start = null; var duration = 2800; function step(ts) { if (!start) start = ts; var p = ((ts – start) % duration) / duration; // Gentle sine wave: opacity between 0.35 and 1.0 var op = 0.35 + 0.65 * (0.5 + 0.5 * Math.sin(p * Math.PI * 2 – Math.PI / 2)); logo.style.opacity = op; requestAnimationFrame(step); } requestAnimationFrame(step); } if (document.readyState === ‘loading’) { document.addEventListener(‘DOMContentLoaded’, twinkle); } else { twinkle(); } })();