diff --git a/core/export_docx.py b/core/export_docx.py
index bafcd5b..92e64a5 100644
--- a/core/export_docx.py
+++ b/core/export_docx.py
@@ -25,10 +25,13 @@ from core.task import TaskState
 
 from docx import Document
 from docx.enum.text import WD_ALIGN_PARAGRAPH
-from docx.oxml import OxmlElement
 from docx.oxml.ns import qn
 from docx.shared import Cm, Pt, RGBColor
 
+# 字体 OOXML 助手复用平台渲染层的单一事实源(rendering/ 无 core 依赖,host 进程
+# 反向引它方向合法;本模块读 PG,不能反过来搬进 rendering —— 那层要保持沙箱可用)。
+from rendering.common import set_run_fonts as _set_run_fonts
+
 
 # ───────────────────────── 配色 ─────────────────────────
 # 选 Word 浅底高对比度的 GitHub-ish 色板,不刺眼也能区分
@@ -44,17 +47,6 @@ COLOR_META_LABEL = RGBColor(0x57, 0x60, 0x6A)
 
 # ───────────────────────── 字体辅助 ─────────────────────────
 
-def _set_run_fonts(run, *, cn_font: str = "宋体", en_font: str = "Times New Roman") -> None:
-    rPr = run._element.get_or_add_rPr()
-    rFonts = rPr.find(qn("w:rFonts"))
-    if rFonts is None:
-        rFonts = OxmlElement("w:rFonts")
-        rPr.append(rFonts)
-    rFonts.set(qn("w:eastAsia"), cn_font)
-    rFonts.set(qn("w:ascii"), en_font)
-    rFonts.set(qn("w:hAnsi"), en_font)
-
-
 def _preserve_spaces(run) -> None:
     """让 docx 不压缩连续空格 — 代码块/JSON 缩进必须留住。"""
     for t in run._element.iter(qn("w:t")):