diff --git a/apps/web/src/components/ai/openclaw-state-machine.tsx b/apps/web/src/components/ai/openclaw-state-machine.tsx
index 3e2bec026..48b75eeb2 100644
--- a/apps/web/src/components/ai/openclaw-state-machine.tsx
+++ b/apps/web/src/components/ai/openclaw-state-machine.tsx
@@ -421,25 +421,24 @@ export function OpenClawStateMachine({
         total={pendingApprovals.length}
       >
         {selectedApproval && (
-          <div className="p-6">
-            <ApprovalCard
-              request={selectedApproval}
-              onApprove={() => {
-                handleApprove(selectedApproval.id)
-                // 簽核後移到下一個或關閉
-                if (selectedIndex !== null && selectedIndex < pendingApprovals.length - 1) {
-                  setSelectedIndex(selectedIndex + 1)
-                } else {
-                  setSelectedIndex(null)
-                }
-              }}
-              onReject={() => {
-                handleReject(selectedApproval.id)
+          <ApprovalCard
+            request={selectedApproval}
+            onApprove={() => {
+              handleApprove(selectedApproval.id)
+              // 簽核後移到下一個或關閉
+              if (selectedIndex !== null && selectedIndex < pendingApprovals.length - 1) {
+                setSelectedIndex(selectedIndex + 1)
+              } else {
                 setSelectedIndex(null)
-              }}
-              holdDuration={1000}
-            />
-          </div>
+              }
+            }}
+            onReject={() => {
+              handleReject(selectedApproval.id)
+              setSelectedIndex(null)
+            }}
+            holdDuration={1000}
+            fullHeight
+          />
         )}
       </ApprovalModal>
 
diff --git a/apps/web/src/components/approval/approval-card.tsx b/apps/web/src/components/approval/approval-card.tsx
index 946ded02d..ad6682072 100644
--- a/apps/web/src/components/approval/approval-card.tsx
+++ b/apps/web/src/components/approval/approval-card.tsx
@@ -82,6 +82,8 @@ export interface ApprovalCardProps {
   readOnly?: boolean
   /** 最終狀態標籤 (歷史紀錄用) */
   finalStatus?: 'approved' | 'rejected' | 'executed' | 'failed'
+  /** 在 Modal 中使用時，移除高度限制 */
+  fullHeight?: boolean
 }
 
 // =============================================================================
@@ -263,6 +265,7 @@ export function ApprovalCard({
   isLoading = false,
   readOnly = false,
   finalStatus,
+  fullHeight = false,
 }: ApprovalCardProps) {
   const t = useTranslations('approval')
   const tRisk = useTranslations('risk')
@@ -331,8 +334,8 @@ export function ApprovalCard({
       padding="none"
       className={cn(
         'relative transition-all duration-300 flex flex-col',
-        // UX 優化: 限制最大高度，內容可滾動
-        'max-h-[70vh]',
+        // UX 優化: 限制最大高度，內容可滾動 (Modal 模式除外)
+        !fullHeight && 'max-h-[70vh]',
         // Nothing.tech 精密極簡風格
         !readOnly && 'hover:-translate-y-0.5 hover:shadow-card-hover',
         // CRITICAL: 左側紅色粗邊框 (乾淨、無光害)
diff --git a/apps/web/src/components/ui/approval-modal.tsx b/apps/web/src/components/ui/approval-modal.tsx
index 2987c3cfe..75548c1c5 100644
--- a/apps/web/src/components/ui/approval-modal.tsx
+++ b/apps/web/src/components/ui/approval-modal.tsx
@@ -10,11 +10,13 @@
  * - 全屏遮罩強制用戶注意，防止誤操作
  * - 居中對話框提供足夠空間顯示所有資訊
  * - 符合 Nothing.tech「一次專注一件事」設計哲學
+ * - 使用 Portal 渲染到 body，確保不受父容器限制
  *
  * 參考: GitHub PR Review, AWS IAM Console
  */
 
-import { useEffect, useCallback } from 'react'
+import { useEffect, useCallback, useState } from 'react'
+import { createPortal } from 'react-dom'
 import { cn } from '@/lib/utils'
 import { X, ChevronLeft, ChevronRight, Shield } from 'lucide-react'
 
@@ -48,6 +50,13 @@ export function ApprovalModal({
     if (e.key === 'ArrowRight' && onNext) onNext()
   }, [onClose, onPrev, onNext])
 
+  // Portal 目標
+  const [mounted, setMounted] = useState(false)
+
+  useEffect(() => {
+    setMounted(true)
+  }, [])
+
   // 鎖定背景滾動
   useEffect(() => {
     if (open) {
@@ -60,10 +69,11 @@ export function ApprovalModal({
     }
   }, [open, handleKeyDown])
 
-  if (!open) return null
+  if (!open || !mounted) return null
 
-  return (
-    <div className="fixed inset-0 z-50 flex items-center justify-center">
+  // 使用 Portal 渲染到 body，確保全屏覆蓋
+  return createPortal(
+    <div className="fixed inset-0 z-[9999] flex items-center justify-center">
       {/* Backdrop - 深色遮罩，強調聚焦 */}
       <div
         className="absolute inset-0 bg-black/60 backdrop-blur-sm animate-in fade-in duration-200"
@@ -144,10 +154,11 @@ export function ApprovalModal({
         </div>
 
         {/* Content - 可滾動 */}
-        <div className="flex-1 overflow-y-auto">
+        <div className="flex-1 overflow-y-auto p-6">
           {children}
         </div>
       </div>
-    </div>
+    </div>,
+    document.body
   )
 }