diff --git a/index.html b/index.html
index 93c1e3c..be65e95 100644
--- a/index.html
+++ b/index.html
@@ -2525,6 +2525,87 @@
             </div>
         </div>
 
+        <script>
+            (function () {
+                var params = new URLSearchParams(window.location.search);
+                var tracking = {
+                    utm_source: params.get("utm_source") || "homepage",
+                    utm_medium: params.get("utm_medium") || "direct",
+                    utm_campaign: params.get("utm_campaign") || "none",
+                    utm_term: params.get("utm_term") || "",
+                    utm_content: params.get("utm_content") || "",
+                };
+
+                function isTrackableHref(href) {
+                    return (
+                        href &&
+                        href.charAt(0) !== "#" &&
+                        href.indexOf("mailto:") !== 0 &&
+                        href.indexOf("tel:") !== 0 &&
+                        href.indexOf("javascript:") !== 0
+                    );
+                }
+
+                function applyToLink(link) {
+                    var href = link.getAttribute("href");
+                    var url;
+                    if (!isTrackableHref(href)) return;
+                    try {
+                        url = new URL(href, window.location.href);
+                    } catch (err) {
+                        return;
+                    }
+                    Object.keys(tracking).forEach(function (key) {
+                        if (tracking[key]) url.searchParams.set(key, tracking[key]);
+                    });
+                    if (url.origin === window.location.origin) {
+                        link.setAttribute("href", url.pathname + url.search + url.hash);
+                        return;
+                    }
+                    link.setAttribute("href", url.toString());
+                }
+
+                function applyToLinks(root) {
+                    var scope = root && root.querySelectorAll ? root : document;
+                    scope.querySelectorAll("a[href]").forEach(applyToLink);
+                }
+
+                function applyToFields(root) {
+                    if (!root || !root.querySelectorAll) return;
+                    Object.keys(tracking).forEach(function (key) {
+                        root.querySelectorAll('input[name="' + key + '"]').forEach(function (input) {
+                            input.value = tracking[key];
+                        });
+                    });
+                }
+
+                function appendToFormData(formData) {
+                    Object.keys(tracking).forEach(function (key) {
+                        formData.set(key, tracking[key]);
+                    });
+                    return formData;
+                }
+
+                function extendPayload(payload) {
+                    Object.keys(tracking).forEach(function (key) {
+                        payload[key] = tracking[key];
+                    });
+                    return payload;
+                }
+
+                applyToFields(document);
+                applyToLinks(document);
+
+                window._mbsTracking = {
+                    params: tracking,
+                    applyToLinks: applyToLinks,
+                    applyToFields: applyToFields,
+                    appendToFormData: appendToFormData,
+                    extendPayload: extendPayload,
+                };
+            })();
+        </script>
+
         <script>
             (function () {
                 var WEBHOOK =
@@ -2536,11 +2617,13 @@
                 form.addEventListener("submit", function (e) {
                     e.preventDefault();
                     var button = form.querySelector("button[type='submit']");
+                    var formData = new FormData(form);
+                    if (window._mbsTracking) formData = window._mbsTracking.appendToFormData(formData);
                     status.textContent = "Sending...";
                     button.disabled = true;
                     fetch(WEBHOOK, {
                         method: "POST",
-                        body: new FormData(form),
+                        body: formData,
                     })
                         .then(function () {
                             status.textContent = "Message received. We will get back to you soon.";
@@ -2620,6 +2703,7 @@
                     } else {
                         grid.innerHTML = pagePosts.map(postMarkup).join("");
                     }
+                    if (window._mbsTracking) window._mbsTracking.applyToLinks(grid);
                     prevBtn.disabled = currentPage === 0;
                     nextBtn.disabled = start + PAGE_SIZE >= filteredPosts.length;
                     updateCount();
@@ -2767,6 +2851,7 @@
                 };
 
                 function send(text) {
+                    var payload;
                     text = (text || "").trim();
                     if (!text || busy) return;
                     busy = true;
@@ -2778,14 +2863,17 @@
                     var thinkEl = appendMsg("agent", "...");
                     thinkEl.classList.add("chat-thinking");
 
+                    payload = {
+                        action: "sendMessage",
+                        chatid: CHAT_ID,
+                        chatInput: text,
+                    };
+                    if (window._mbsTracking) payload = window._mbsTracking.extendPayload(payload);
+
                     fetch(CHAT_URL, {
                         method: "POST",
                         headers: { "Content-Type": "application/json" },
-                        body: JSON.stringify({
-                            action: "sendMessage",
-                            chatid: CHAT_ID,
-                            chatInput: text,
-                        }),
+                        body: JSON.stringify(payload),
                     })
                         .then(function (r) {
                             var ct = r.headers.get("content-type") || "";
@@ -3012,6 +3100,7 @@
                 }
 
                 function fire(geo) {
+                    var payload;
                     if (fired) return;
                     fired = true;
                     var chatId =
@@ -3023,14 +3112,17 @@
                                 return (c === "x" ? r2 : (r2 & 0x3) | 0x8).toString(16);
                             },
                         );
+                    payload = {
+                        action: "sendMessage",
+                        chatid: chatId,
+                        chatInput: buildMsg(geo),
+                    };
+                    if (window._mbsTracking) payload = window._mbsTracking.extendPayload(payload);
+
                     fetch(CHAT_URL, {
                         method: "POST",
                         headers: { "Content-Type": "application/json" },
-                        body: JSON.stringify({
-                            action: "sendMessage",
-                            chatid: chatId,
-                            chatInput: buildMsg(geo),
-                        }),
+                        body: JSON.stringify(payload),
                     })
                         .then(function (res) {
                             var ct = res.headers.get("content-type") || "";
@@ -3086,6 +3178,7 @@
                 function openModal(plan) {
                     planField.value = plan || "General Free Trial";
                     productField.value = plan || defaultProduct;
+                    if (window._mbsTracking) window._mbsTracking.applyToFields(form);
                     overlay.style.display = "flex";
                     document.body.style.overflow = "hidden";
                 }
@@ -3099,6 +3192,7 @@
                         form.reset();
                         planField.value = "General Free Trial";
                         productField.value = defaultProduct;
+                        if (window._mbsTracking) window._mbsTracking.applyToFields(form);
                         var btn = form.querySelector(".modal-submit");
                         btn.textContent = "Start Free Trial";
                         btn.disabled = false;
@@ -3129,10 +3223,12 @@
                 form.addEventListener("submit", function (e) {
                     e.preventDefault();
                     var btn = form.querySelector(".modal-submit");
+                    var formData = new FormData(form);
+                    if (window._mbsTracking) formData = window._mbsTracking.appendToFormData(formData);
                     btn.textContent = "Sending...";
                     btn.disabled = true;
 
-                    fetch(WEBHOOK, { method: "POST", body: new FormData(form) })
+                    fetch(WEBHOOK, { method: "POST", body: formData })
                         .then(function () {
                             form.style.display = "none";
                             confirmDiv.style.display = "block";