diff --git a/internal/shared/pdf/database_table_reader.go b/internal/shared/pdf/database_table_reader.go
index f5da128..0daead6 100644
--- a/internal/shared/pdf/database_table_reader.go
+++ b/internal/shared/pdf/database_table_reader.go
@@ -552,6 +552,9 @@ func (r *DatabaseTableReader) getContentPreview(content string, maxLen int) stri
 	if len(content) <= maxLen {
 		return content
 	}
+	if maxLen > len(content) {
+		maxLen = len(content)
+	}
 	return content[:maxLen] + "..."
 }
 
diff --git a/internal/shared/pdf/page_builder.go b/internal/shared/pdf/page_builder.go
index 11db7db..88a8f40 100644
--- a/internal/shared/pdf/page_builder.go
+++ b/internal/shared/pdf/page_builder.go
@@ -1186,10 +1186,14 @@ func (pb *PageBuilder) drawRichTextBlock(pdf *gofpdf.Fpdf, text string, contentW
 // getContentPreview 获取内容预览（用于日志记录）
 func (pb *PageBuilder) getContentPreview(content string, maxLen int) string {
 	content = strings.TrimSpace(content)
-	if len(content) <= maxLen {
+	if maxLen <= 0 || len(content) <= maxLen {
 		return content
 	}
-	return content[:maxLen] + "..."
+	n := maxLen
+	if n > len(content) {
+		n = len(content)
+	}
+	return content[:n] + "..."
 }
 
 // wrapJSONLinesToWidth 将 JSON 文本按宽度换行，返回用于绘制的行列表（兼容中文等）
diff --git a/internal/shared/pdf/text_processor.go b/internal/shared/pdf/text_processor.go
index 5dfdb32..93746e7 100644
--- a/internal/shared/pdf/text_processor.go
+++ b/internal/shared/pdf/text_processor.go
@@ -175,10 +175,11 @@ func (tp *TextProcessor) parseInlineSegments(block string) []inlineSeg {
 	if plain == "" {
 		return segs
 	}
-	// 在原始 block 上找加粗区间，再映射到 plain（去掉标签后的位置）
+	// 在 block 上找加粗区间，再映射到 plain（去掉标签后的位置）
+	// 注意：work 每次循环被截断，必须用相对 work 的索引切片，避免 work[:endInWork] 越界
 	work := block
 	var boldRanges [][2]int
-	offset := 0
+	plainOffset := 0
 	for {
 		idxOpen := reBoldOpen.FindStringIndex(work)
 		if idxOpen == nil {
@@ -189,34 +190,45 @@ func (tp *TextProcessor) parseInlineSegments(block string) []inlineSeg {
 		if idxClose == nil {
 			break
 		}
-		startInWork := offset + idxOpen[1]
-		endInWork := offset + idxOpen[1] + idxClose[0]
-		// 将 work 坐标映射到 plain：需要数 plain 中对应字符
-		workBefore := work[:startInWork]
+		closeLen := len(reBoldClose.FindString(afterOpen))
+		// 使用相对当前 work 的字节偏移，保证 work[:endInWork] 不越界
+		endInWork := idxOpen[1] + idxClose[0]
+		workBefore := work[:idxOpen[1]]
 		plainBefore := regexp.MustCompile(`<[^>]+>`).ReplaceAllString(workBefore, "")
 		plainBefore = regexp.MustCompile(`[ \t]+`).ReplaceAllString(plainBefore, " ")
-		startPlain := len([]rune(plainBefore))
+		startPlain := plainOffset + len([]rune(plainBefore))
 		workUntil := work[:endInWork]
 		plainUntil := regexp.MustCompile(`<[^>]+>`).ReplaceAllString(workUntil, "")
 		plainUntil = regexp.MustCompile(`[ \t]+`).ReplaceAllString(plainUntil, " ")
-		endPlain := len([]rune(plainUntil))
+		endPlain := plainOffset + len([]rune(plainUntil))
 		boldRanges = append(boldRanges, [2]int{startPlain, endPlain})
-		work = work[endInWork+len(reBoldClose.FindString(afterOpen)):]
-		offset = endInWork + len(reBoldClose.FindString(afterOpen))
+		consumed := work[:endInWork+closeLen]
+		strippedConsumed := regexp.MustCompile(`<[^>]+>`).ReplaceAllString(consumed, "")
+		strippedConsumed = regexp.MustCompile(`[ \t]+`).ReplaceAllString(strippedConsumed, " ")
+		plainOffset += len([]rune(strippedConsumed))
+		work = work[endInWork+closeLen:]
 	}
-	// 按 boldRanges 切分 plain
+	// 按 boldRanges 切分 plain（限制区间在 [0,len(runes)] 内，防止越界）
 	runes := []rune(plain)
+	nr := len(runes)
 	inBold := false
 	var start int
-	for i := 0; i <= len(runes); i++ {
+	for i := 0; i <= nr; i++ {
 		nowBold := false
 		for _, r := range boldRanges {
-			if i >= r[0] && i < r[1] {
+			r0, r1 := r[0], r[1]
+			if r0 < 0 {
+				r0 = 0
+			}
+			if r1 > nr {
+				r1 = nr
+			}
+			if r0 < r1 && i >= r0 && i < r1 {
 				nowBold = true
 				break
 			}
 		}
-		if nowBold != inBold || i == len(runes) {
+		if nowBold != inBold || i == nr {
 			if i > start {
 				segs = append(segs, inlineSeg{Text: string(runes[start:i]), Bold: inBold})
 			}