diff --git a/whitepaper/inject-whitepaper-css.py b/whitepaper/inject-whitepaper-css.py
index 9d0fe61..44c47ee 100644
--- a/whitepaper/inject-whitepaper-css.py
+++ b/whitepaper/inject-whitepaper-css.py
@@ -49,7 +49,56 @@ body > .uncloseai-floating-button {{
   max-width: none !important;
   background-color: transparent !important;
 }}
+/* Click-to-zoom lightbox for diagrams. */
+main img, section img {{
+  cursor: zoom-in;
+}}
+.wp-lightbox {{
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.92);
+  display: none;
+  align-items: center;
+  justify-content: center;
+  z-index: 10001;
+  cursor: zoom-out;
+  padding: 1.5rem;
+}}
+.wp-lightbox.open {{ display: flex; }}
+.wp-lightbox img {{
+  max-width: 100%;
+  max-height: 100%;
+  object-fit: contain;
+  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.6);
+}}
 </style>
+<script>
+(function () {{
+  if (window.__wpLightbox) return;
+  window.__wpLightbox = true;
+  document.addEventListener("DOMContentLoaded", function () {{
+    var imgs = document.querySelectorAll("main img, section img");
+    if (!imgs.length) return;
+    var overlay = document.createElement("div");
+    overlay.className = "wp-lightbox";
+    var big = document.createElement("img");
+    big.alt = "";
+    overlay.appendChild(big);
+    document.body.appendChild(overlay);
+    function close() {{ overlay.classList.remove("open"); big.src = ""; }}
+    overlay.addEventListener("click", close);
+    document.addEventListener("keydown", function (e) {{
+      if (e.key === "Escape") close();
+    }});
+    imgs.forEach(function (img) {{
+      img.addEventListener("click", function () {{
+        big.src = img.currentSrc || img.src;
+        overlay.classList.add("open");
+      }});
+    }});
+  }});
+}})();
+</script>
 """
 
 
diff --git a/whitepaper/lumbda-whitepaper.html b/whitepaper/lumbda-whitepaper.html
index 98041c4..9e5be86 100644
--- a/whitepaper/lumbda-whitepaper.html
+++ b/whitepaper/lumbda-whitepaper.html
@@ -836,7 +836,56 @@ body > .uncloseai-floating-button {
   max-width: none !important;
   background-color: transparent !important;
 }
+/* Click-to-zoom lightbox for diagrams. */
+main img, section img {
+  cursor: zoom-in;
+}
+.wp-lightbox {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.92);
+  display: none;
+  align-items: center;
+  justify-content: center;
+  z-index: 10001;
+  cursor: zoom-out;
+  padding: 1.5rem;
+}
+.wp-lightbox.open { display: flex; }
+.wp-lightbox img {
+  max-width: 100%;
+  max-height: 100%;
+  object-fit: contain;
+  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.6);
+}
 </style>
+<script>
+(function () {
+  if (window.__wpLightbox) return;
+  window.__wpLightbox = true;
+  document.addEventListener("DOMContentLoaded", function () {
+    var imgs = document.querySelectorAll("main img, section img");
+    if (!imgs.length) return;
+    var overlay = document.createElement("div");
+    overlay.className = "wp-lightbox";
+    var big = document.createElement("img");
+    big.alt = "";
+    overlay.appendChild(big);
+    document.body.appendChild(overlay);
+    function close() { overlay.classList.remove("open"); big.src = ""; }
+    overlay.addEventListener("click", close);
+    document.addEventListener("keydown", function (e) {
+      if (e.key === "Escape") close();
+    });
+    imgs.forEach(function (img) {
+      img.addEventListener("click", function () {
+        big.src = img.currentSrc || img.src;
+        overlay.classList.add("open");
+      });
+    });
+  });
+})();
+</script>
 </head>
 <body>
 <main id="lumbda">
