diff --git a/internal/sync/kepub_cfi_converter.go b/internal/sync/kepub_cfi_converter.go
index 29bc49b..4a2aad1 100644
--- a/internal/sync/kepub_cfi_converter.go
+++ b/internal/sync/kepub_cfi_converter.go
@@ -208,23 +208,54 @@ func extractSurroundingText(textNode *html.Node, offset int, window int) string
 		return ""
 	}
 
-	text := textNode.Data
-	runes := []rune(text)
+	block := findBlockParent(textNode)
+	if block == nil {
+		text := textNode.Data
+		runes := []rune(text)
+		start := offset - window
+		if start < 0 {
+			start = 0
+		}
+		end := offset + window
+		if end > len(runes) {
+			end = len(runes)
+		}
+		if start >= end {
+			return normalizeWhitespace(text)
+		}
+		return normalizeWhitespace(string(runes[start:end]))
+	}
 
-	start := offset - window
+	segments := collectInlineText(block)
+
+	globalOffset := 0
+	for _, seg := range segments {
+		if seg.node == textNode {
+			globalOffset += offset
+			break
+		}
+		globalOffset += len(seg.runes)
+	}
+
+	var allRunes []rune
+	for _, seg := range segments {
+		allRunes = append(allRunes, seg.runes...)
+	}
+
+	start := globalOffset - window
 	if start < 0 {
 		start = 0
 	}
-	end := offset + window
-	if end > len(runes) {
-		end = len(runes)
+	end := globalOffset + window
+	if end > len(allRunes) {
+		end = len(allRunes)
 	}
 
 	if start >= end {
-		return normalizeWhitespace(text)
+		return normalizeWhitespace(string(allRunes))
 	}
 
-	return normalizeWhitespace(string(runes[start:end]))
+	return normalizeWhitespace(string(allRunes[start:end]))
 }
 
 func (k *KEPUBCFIConverter) ComputeKEPUBPercentage(kepubCFI string) (float64, error) {