2 files changed, 28 insertions, 2 deletions
diff --git a/internal/comic/comic_test.go b/internal/comic/comic_test.go
index be4ae6c..020fba5 100644
--- a/internal/comic/comic_test.go
+++ b/internal/comic/comic_test.go
@@ -111,6 +111,31 @@ func TestPanelLabelSupportsMultiLetterSequence(t *testing.T) {
 	}
 }
 
+func TestValidateGeneratedResultUsesExcelStylePanelLabels(t *testing.T) {
+	t.Parallel()
+
+	page := make([]string, 27)
+	for i := range page {
+		page[i] = "а"
+	}
+	page[26] = "latin"
+
+	err := validateGeneratedResult(GenerateResult{
+		StoryText: "история",
+		Bible:     "библия",
+		Title:     "Заглавие",
+		PanelScript: [][]string{
+			page,
+		},
+	}, "Cyrillic")
+	if err == nil {
+		t.Fatal("validateGeneratedResult() error = nil, want panel label failure")
+	}
+	if !strings.Contains(err.Error(), "panel script P1-AA") {
+		t.Fatalf("validateGeneratedResult() error = %v, want Excel-style panel label", err)
+	}
+}
+
 func TestComicOutputDirDoesNotDuplicateComicsSegment(t *testing.T) {
 	t.Parallel()
 
diff --git a/internal/comic/generator.go b/internal/comic/generator.go
index 8a13c0d..644acf6 100644
--- a/internal/comic/generator.go
+++ b/internal/comic/generator.go
@@ -192,10 +192,11 @@ func validateGeneratedResult(result GenerateResult, script string) error {
 	}
 	for pageIdx, page := range result.PanelScript {
 		for panelIdx, panel := range page {
-			if err := validateTextScript(fmt.Sprintf("panel script P%d-%c", pageIdx+1, 'A'+panelIdx), panel, script); err != nil {
+			label := fmt.Sprintf("panel script P%d-%s", pageIdx+1, panelLabel(panelIdx))
+			if err := validateTextScript(label, panel, script); err != nil {
 				return fmt.Errorf("%w (panel=%q)", err, compactTextSnippet(panel))
 			}
-			if err := validateNoPromptLeakage(fmt.Sprintf("panel script P%d-%c", pageIdx+1, 'A'+panelIdx), panel); err != nil {
+			if err := validateNoPromptLeakage(label, panel); err != nil {
 				return fmt.Errorf("%w (panel=%q)", err, compactTextSnippet(panel))
 			}
 		}