diff --git a/web/src/components/doc/DocGovActionBar.tsx b/web/src/components/doc/DocGovActionBar.tsx
index 008ecca2..87b3000e 100644
--- a/web/src/components/doc/DocGovActionBar.tsx
+++ b/web/src/components/doc/DocGovActionBar.tsx
@@ -1,4 +1,5 @@
 import React, { useRef, useState } from 'react';
+import { createPortal } from 'react-dom';
 import { DocumentAST } from '../../types/block';
 import { UserRole } from '../../types/docgov';
 import { canShowDocGovApprovalAction, isUnmanagedDocDuties } from '../../lib/docGovActionVisibility';
@@ -102,6 +103,118 @@ export const DocGovActionBar: React.FC<DocGovActionBarProps> = ({
   const showReview = canShowDocGovApprovalAction('review', currentUserId, duties);
   const showApprove = canShowDocGovApprovalAction('approve', currentUserId, duties);
 
+  // Portal to document.body so sticky ActionBar stacking context cannot trap the overlay
+  // below chat floating chrome (zIndex must match DocVisibilityModal ≥ 1000).
+  const rejectModal =
+    rejectModalOpen && typeof document !== 'undefined'
+      ? createPortal(
+          <div
+            style={{
+              position: 'fixed',
+              inset: 0,
+              background: 'rgba(0, 0, 0, 0.5)',
+              zIndex: 1000,
+              display: 'flex',
+              alignItems: 'center',
+              justifyContent: 'center',
+            }}
+          >
+            <div
+              style={{
+                width: '420px',
+                background: 'var(--bg-panel)',
+                borderRadius: 'var(--r-md)',
+                border: '1px solid var(--border)',
+                padding: '16px',
+                display: 'flex',
+                flexDirection: 'column',
+                gap: '12px',
+                boxShadow: 'var(--shadow-lg)',
+              }}
+            >
+              <div style={{ fontSize: '14px', fontWeight: 700, color: 'var(--danger)' }}>
+                请填写法定驳回原因 (必填)
+              </div>
+              <textarea
+                ref={rejectTextareaRef}
+                value={rejectReason}
+                onChange={(e) => {
+                  const next = e.target.value;
+                  rejectReasonRef.current = next;
+                  setRejectReason(next);
+                }}
+                onKeyDown={(e) => {
+                  if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
+                    e.preventDefault();
+                    void confirmReject();
+                  }
+                }}
+                placeholder="说明驳回修改的具体意见，例如：缺少第3章电气安全检验标准，或技术参数指标不符合临床预期..."
+                rows={4}
+                disabled={rejectSubmitting}
+                style={{
+                  width: '100%',
+                  padding: '8px 10px',
+                  borderRadius: 'var(--r-sm)',
+                  border: '1px solid var(--border)',
+                  background: 'var(--bg-subtle)',
+                  color: 'var(--text)',
+                  fontSize: '12.5px',
+                  resize: 'none',
+                }}
+              />
+              {rejectError ? (
+                <div style={{ fontSize: '12px', color: 'var(--danger)' }} role="alert">
+                  驳回失败：{rejectError}
+                </div>
+              ) : null}
+              <div style={{ display: 'flex', justifyContent: 'flex-end', gap: '8px' }}>
+                <button
+                  type="button"
+                  onClick={() => {
+                    if (rejectSubmitting) return;
+                    setRejectModalOpen(false);
+                  }}
+                  disabled={rejectSubmitting}
+                  style={{
+                    padding: '6px 12px',
+                    borderRadius: 'var(--r-sm)',
+                    background: 'var(--bg-subtle)',
+                    border: '1px solid var(--border)',
+                    color: 'var(--text)',
+                    cursor: rejectSubmitting ? 'not-allowed' : 'pointer',
+                    opacity: rejectSubmitting ? 0.6 : 1,
+                  }}
+                >
+                  取消
+                </button>
+                <button
+                  type="button"
+                  data-testid="docgov-reject-confirm"
+                  onClick={() => {
+                    void confirmReject();
+                  }}
+                  disabled={rejectSubmitting}
+                  style={{
+                    padding: '6px 14px',
+                    borderRadius: 'var(--r-sm)',
+                    background: 'var(--danger)',
+                    border: 'none',
+                    color: '#fff',
+                    fontWeight: 600,
+                    opacity: rejectSubmitting ? 0.5 : 1,
+                    cursor: rejectSubmitting ? 'not-allowed' : 'pointer',
+                  }}
+                >
+                  {rejectSubmitting ? '驳回中…' : '确认驳回退回编制'}
+                </button>
+              </div>
+            </div>
+          </div>,
+          document.body,
+        )
+      : null;
+
   return (
     <div
       style={{
@@ -119,105 +232,7 @@ export const DocGovActionBar: React.FC<DocGovActionBarProps> = ({
         zIndex: 30,
       }}
     >
-      {/* 驳回理由弹窗 */}
-      {rejectModalOpen && (
-        <div
-          style={{
-            position: 'fixed',
-            inset: 0,
-            background: 'rgba(0, 0, 0, 0.5)',
-            zIndex: 110,
-            display: 'flex',
-            alignItems: 'center',
-            justifyContent: 'center',
-          }}
-        >
-          <div
-            style={{
-              width: '420px',
-              background: 'var(--bg-panel)',
-              borderRadius: 'var(--r-md)',
-              border: '1px solid var(--border)',
-              padding: '16px',
-              display: 'flex',
-              flexDirection: 'column',
-              gap: '12px',
-              boxShadow: 'var(--shadow-lg)',
-            }}
-          >
-            <div style={{ fontSize: '14px', fontWeight: 700, color: 'var(--danger)' }}>
-              请填写法定驳回原因 (必填)
-            </div>
-            <textarea
-              ref={rejectTextareaRef}
-              value={rejectReason}
-              onChange={(e) => {
-                const next = e.target.value;
-                rejectReasonRef.current = next;
-                setRejectReason(next);
-              }}
-              placeholder="说明驳回修改的具体意见，例如：缺少第3章电气安全检验标准，或技术参数指标不符合临床预期..."
-              rows={4}
-              disabled={rejectSubmitting}
-              style={{
-                width: '100%',
-                padding: '8px 10px',
-                borderRadius: 'var(--r-sm)',
-                border: '1px solid var(--border)',
-                background: 'var(--bg-subtle)',
-                color: 'var(--text)',
-                fontSize: '12.5px',
-                resize: 'none',
-              }}
-            />
-            {rejectError ? (
-              <div style={{ fontSize: '12px', color: 'var(--danger)' }} role="alert">
-                驳回失败：{rejectError}
-              </div>
-            ) : null}
-            <div style={{ display: 'flex', justifyContent: 'flex-end', gap: '8px' }}>
-              <button
-                type="button"
-                onClick={() => {
-                  if (rejectSubmitting) return;
-                  setRejectModalOpen(false);
-                }}
-                disabled={rejectSubmitting}
-                style={{
-                  padding: '6px 12px',
-                  borderRadius: 'var(--r-sm)',
-                  background: 'var(--bg-subtle)',
-                  border: '1px solid var(--border)',
-                  color: 'var(--text)',
-                  cursor: rejectSubmitting ? 'not-allowed' : 'pointer',
-                  opacity: rejectSubmitting ? 0.6 : 1,
-                }}
-              >
-                取消
-              </button>
-              <button
-                type="button"
-                onClick={() => {
-                  void confirmReject();
-                }}
-                disabled={rejectSubmitting}
-                style={{
-                  padding: '6px 14px',
-                  borderRadius: 'var(--r-sm)',
-                  background: 'var(--danger)',
-                  border: 'none',
-                  color: '#fff',
-                  fontWeight: 600,
-                  opacity: rejectSubmitting ? 0.5 : 1,
-                  cursor: rejectSubmitting ? 'not-allowed' : 'pointer',
-                }}
-              >
-                {rejectSubmitting ? '驳回中…' : '确认驳回退回编制'}
-              </button>
-            </div>
-          </div>
-        </div>
-      )}
+      {rejectModal}
 
       {/* 场景 1: 个人私密文档专属条 */}
       {isPrivate && (