diff --git a/script.js b/script.js
index aaf47b4..4202ffd 100644
--- a/script.js
+++ b/script.js
@@ -1,6 +1,13 @@
 // CoBiE Time System Implementation
 // Using Unix TAI epoch (January 1, 1970, 00:00:00 TAI)
 // Note: TAI differs from UTC by leap seconds (37 seconds as of 2025)
+
+(function() {
+if (!window.Cobie) {
+  console.error('cobie.js not loaded');
+  return;
+}
+
 const {
   COBIE_EPOCH,
   COBIE_UNITS,
@@ -794,6 +801,7 @@ function commitInput() {
   span.addEventListener('click', enterEdit);
 }
 
+function init() {
 // Timezone change handler
 document.getElementById('timezone').addEventListener('change', (e) => {
     currentTimezone = e.target.value;
@@ -923,3 +931,15 @@ function wheelNavigate(e) {
 }
 
 document.addEventListener('wheel', wheelNavigate);
+
+}
+
+if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', init);
+} else {
+    init();
+}
+
+window.navigatePeriod = navigatePeriod;
+window.goToNow       = goToNow;
+})();