diff --git a/engine/src/parser/pdfium_document.cpp b/engine/src/parser/pdfium_document.cpp
index 15b1dd5..e62e472 100644
--- a/engine/src/parser/pdfium_document.cpp
+++ b/engine/src/parser/pdfium_document.cpp
@@ -2982,6 +2982,12 @@ std::expected<void, EngineError> PdfiumDocument::applyEdits(const std::string& e
                         if (align == "right") x = columnLeft + (columnWidth - naturalW);
                         else if (align == "center") x = columnLeft + (columnWidth - naturalW) / 2.0;
                     }
+                    // The line's TRUE starting x (after lineX/center/right). The caret layout below
+                    // records this as x0 so the frontend places the caret on the actual glyphs. (It
+                    // used to hardcode columnLeft, which only matched left-aligned lines — center/right
+                    // headings then mismapped clicks. x0 is caret-only metadata; it does not affect
+                    // glyph emission or the rendered page.)
+                    const double lineStartX = x;
                     for (size_t k = 0; k < lw.size(); ++k) {
                         size_t wi = lw[k];
                         if (k > 0) {
@@ -3026,7 +3032,7 @@ std::expected<void, EngineError> PdfiumDocument::applyEdits(const std::string& e
                         x += words[wi].width;
                     }
                     layoutLines.push_back({
-                        {"baselineY", baselineY}, {"x0", columnLeft},
+                        {"baselineY", baselineY}, {"x0", lineStartX},
                         {"fontSize", lineFontSize > 0 ? lineFontSize : leading / 1.2},
                         {"text", lineText}, {"adv", adv},
                     });
diff --git a/frontend/src/lib/pdfiumEngine.ts b/frontend/src/lib/pdfiumEngine.ts
index db0b17a..91ecd57 100644
--- a/frontend/src/lib/pdfiumEngine.ts
+++ b/frontend/src/lib/pdfiumEngine.ts
@@ -23,7 +23,7 @@ function getModule(): Promise<PdfiumModule | null> {
   if (!modulePromise) {
     modulePromise = (async () => {
       try {
-        const V = '20260617b';
+        const V = '20260617c';
         const resp = await fetch(`/pdfium-engine.mjs?v=${V}`, { cache: 'no-store' });
         if (!resp.ok) throw new Error(`pdfium-engine.mjs ${resp.status}`);
         const blobUrl = URL.createObjectURL(new Blob([await resp.text()], { type: 'text/javascript' }));