diff --git a/index.html b/index.html
index 5c167ad..42cf6c5 100644
--- a/index.html
+++ b/index.html
@@ -1151,9 +1151,15 @@
       <h1>CBP What-If Calculator</h1>
       <p>Full ladder modeling — profit timeline, referral earnings, and scenario comparison</p>
       <div class="cta-bar" id="calcCtaBar">
-        <a class="cta-btn cta-btn-primary" id="calcSignupBtn" href="https://clickbaitpays.me/?ref=cryptoteambuild" target="_blank" rel="noopener">
+        <a class="cta-btn cta-btn-primary" id="calcSignupBtn" href="#" target="_blank" rel="noopener">
           🚀 Sign Up with My Referral Link
         </a>
+        <script>
+          (function(){
+            var ref = new URLSearchParams(window.location.search).get('ref');
+            if (ref) document.getElementById('calcSignupBtn').href = 'https://clickbaitpays.me/?ref=' + encodeURIComponent(ref);
+          })();
+        </script>
         <button class="cta-btn cta-btn-secondary" onclick="copyCalculatorLink()">
           📄 Copy Calculator Link
         </button>