diff --git a/src/App.tsx b/src/App.tsx
index 14fe6b9..5b5082a 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -25,6 +25,15 @@ function App() {
   const [isMobile, setIsMobile] = useState(false)
   const [mobileTab, setMobileTab] = useState(getInitialTab())
   
+  // 功能菜单状态
+  const [menuVisible, setMenuVisible] = useState(false)
+  const [menuPosition, setMenuPosition] = useState({ x: 0, y: 0 })
+  const [currentInput, setCurrentInput] = useState<{ 
+    value: string; 
+    setter: React.Dispatch<React.SetStateAction<string>>; 
+    readOnly: boolean 
+  } | null>(null)
+  
   // 检测是否为移动设备
   useEffect(() => {
     const checkMobile = () => {
@@ -39,6 +48,73 @@ function App() {
     }
   }, [])
   
+  // 点击外部关闭菜单
+  useEffect(() => {
+    const handleClickOutside = () => {
+      setMenuVisible(false)
+    }
+    
+    if (menuVisible) {
+      document.addEventListener('click', handleClickOutside)
+    }
+    
+    return () => {
+      document.removeEventListener('click', handleClickOutside)
+    }
+  }, [menuVisible])
+  
+  // 打开功能菜单
+  const openMenu = (e: React.MouseEvent | React.TouchEvent, value: string, setter: React.Dispatch<React.SetStateAction<string>>, readOnly: boolean) => {
+    e.preventDefault()
+    
+    let x = 0
+    let y = 0
+    
+    if ('clientX' in e) {
+      // 鼠标事件
+      x = e.clientX
+      y = e.clientY
+    } else if ('touches' in e && e.touches.length > 0) {
+      // 触摸事件
+      x = e.touches[0].clientX
+      y = e.touches[0].clientY
+    }
+    
+    setMenuPosition({ x, y })
+    setCurrentInput({ value, setter, readOnly })
+    setMenuVisible(true)
+  }
+  
+  // 清空输入
+  const handleClear = () => {
+    if (currentInput) {
+      currentInput.setter('')
+      setMenuVisible(false)
+    }
+  }
+  
+  // 复制全部
+  const handleCopyAll = () => {
+    if (currentInput && currentInput.value) {
+      navigator.clipboard.writeText(currentInput.value).catch(err => {
+        console.error('复制失败:', err)
+      })
+      setMenuVisible(false)
+    }
+  }
+  
+  // 粘贴覆盖
+  const handlePaste = () => {
+    if (currentInput && !currentInput.readOnly) {
+      navigator.clipboard.readText().then(text => {
+        currentInput.setter(text)
+      }).catch(err => {
+        console.error('粘贴失败:', err)
+      })
+      setMenuVisible(false)
+    }
+  }
+  
   // 处理移动设备的 tab 切换
   const handleMobileTabChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
     const tab = e.target.value
@@ -471,6 +547,13 @@ function App() {
               <textarea 
                 value={sm2PrivateKey} 
                 onChange={(e) => setSm2PrivateKey(e.target.value)}
+                onContextMenu={(e) => openMenu(e, sm2PrivateKey, setSm2PrivateKey, false)}
+                onTouchStart={(e) => {
+                  const touchTimer = setTimeout(() => {
+                    openMenu(e, sm2PrivateKey, setSm2PrivateKey, false)
+                  }, 500)
+                  return () => clearTimeout(touchTimer)
+                }}
                 placeholder="输入私钥 (hex) 或点击生成密钥对" 
                 style={{
                   width: '100%',
@@ -490,6 +573,13 @@ function App() {
               <textarea 
                 value={sm2PublicKey} 
                 onChange={(e) => setSm2PublicKey(e.target.value)}
+                onContextMenu={(e) => openMenu(e, sm2PublicKey, setSm2PublicKey, false)}
+                onTouchStart={(e) => {
+                  const touchTimer = setTimeout(() => {
+                    openMenu(e, sm2PublicKey, setSm2PublicKey, false)
+                  }, 500)
+                  return () => clearTimeout(touchTimer)
+                }}
                 placeholder="输入公钥 (hex) 或点击生成密钥对" 
                 style={{
                   width: '100%',
@@ -556,6 +646,13 @@ function App() {
                   <textarea 
                     value={sm2Message} 
                     onChange={(e) => setSm2Message(e.target.value)}
+                    onContextMenu={(e) => openMenu(e, sm2Message, setSm2Message, false)}
+                    onTouchStart={(e) => {
+                      const touchTimer = setTimeout(() => {
+                        openMenu(e, sm2Message, setSm2Message, false)
+                      }, 500)
+                      return () => clearTimeout(touchTimer)
+                    }}
                     placeholder="输入要加密的消息 (hex)" 
                     style={{
                       width: '100%',
@@ -575,6 +672,13 @@ function App() {
                   <textarea 
                     value={sm2Encrypted} 
                     onChange={(e) => setSm2Encrypted(e.target.value)}
+                    onContextMenu={(e) => openMenu(e, sm2Encrypted, setSm2Encrypted, false)}
+                    onTouchStart={(e) => {
+                      const touchTimer = setTimeout(() => {
+                        openMenu(e, sm2Encrypted, setSm2Encrypted, false)
+                      }, 500)
+                      return () => clearTimeout(touchTimer)
+                    }}
                     placeholder="输入加密结果 (hex)" 
                     style={{
                       width: '100%',
@@ -594,6 +698,13 @@ function App() {
                   <textarea 
                     value={sm2Decrypted} 
                     readOnly
+                    onContextMenu={(e) => openMenu(e, sm2Decrypted, setSm2Decrypted, true)}
+                    onTouchStart={(e) => {
+                      const touchTimer = setTimeout(() => {
+                        openMenu(e, sm2Decrypted, setSm2Decrypted, true)
+                      }, 500)
+                      return () => clearTimeout(touchTimer)
+                    }}
                     placeholder="解密结果将显示在这里" 
                     style={{
                       width: '100%',
@@ -656,6 +767,13 @@ function App() {
                   <textarea 
                     value={sm2SignMessage} 
                     onChange={(e) => setSm2SignMessage(e.target.value)}
+                    onContextMenu={(e) => openMenu(e, sm2SignMessage, setSm2SignMessage, false)}
+                    onTouchStart={(e) => {
+                      const touchTimer = setTimeout(() => {
+                        openMenu(e, sm2SignMessage, setSm2SignMessage, false)
+                      }, 500)
+                      return () => clearTimeout(touchTimer)
+                    }}
                     placeholder="输入要签名的消息 (hex)" 
                     style={{
                       width: '100%',
@@ -675,6 +793,13 @@ function App() {
                   <textarea 
                     value={sm2Signature} 
                     onChange={(e) => setSm2Signature(e.target.value)}
+                    onContextMenu={(e) => openMenu(e, sm2Signature, setSm2Signature, false)}
+                    onTouchStart={(e) => {
+                      const touchTimer = setTimeout(() => {
+                        openMenu(e, sm2Signature, setSm2Signature, false)
+                      }, 500)
+                      return () => clearTimeout(touchTimer)
+                    }}
                     placeholder="输入签名 (hex)" 
                     style={{
                       width: '100%',
@@ -760,6 +885,13 @@ function App() {
             <textarea 
               value={sm3Message} 
               onChange={(e) => setSm3Message(e.target.value)}
+              onContextMenu={(e) => openMenu(e, sm3Message, setSm3Message, false)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm3Message, setSm3Message, false)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="输入要计算的消息" 
               style={{
                 width: '100%',
@@ -780,6 +912,13 @@ function App() {
             <textarea 
               value={sm3Result} 
               readOnly
+              onContextMenu={(e) => openMenu(e, sm3Result, setSm3Result, true)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm3Result, setSm3Result, true)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="SM3 计算结果将显示在这里" 
               style={{
                 width: '100%',
@@ -818,6 +957,13 @@ function App() {
               type="text" 
               value={sm3HmacKey} 
               onChange={(e) => setSm3HmacKey(e.target.value)}
+              onContextMenu={(e) => openMenu(e, sm3HmacKey, setSm3HmacKey, false)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm3HmacKey, setSm3HmacKey, false)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="输入 HMAC 密钥 (hex)" 
               style={{
                 width: '100%',
@@ -836,6 +982,13 @@ function App() {
             <textarea 
               value={sm3HmacResult}
               readOnly
+              onContextMenu={(e) => openMenu(e, sm3HmacResult, setSm3HmacResult, true)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm3HmacResult, setSm3HmacResult, true)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="SM3 HMAC 计算结果将显示在这里" 
               style={{
                 width: '100%',
@@ -881,6 +1034,13 @@ function App() {
               type="text" 
               value={sm4Key} 
               onChange={(e) => setSm4Key(e.target.value)}
+              onContextMenu={(e) => openMenu(e, sm4Key, setSm4Key, false)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm4Key, setSm4Key, false)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="输入 16 字节密钥 (32 位 hex)" 
               style={{
                 width: '100%',
@@ -900,6 +1060,13 @@ function App() {
               type="text" 
               value={sm4Iv} 
               onChange={(e) => setSm4Iv(e.target.value)}
+              onContextMenu={(e) => openMenu(e, sm4Iv, setSm4Iv, false)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm4Iv, setSm4Iv, false)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="输入 16 字节 IV (32 位 hex)" 
               style={{
                 width: '100%',
@@ -970,6 +1137,13 @@ function App() {
             <textarea 
               value={sm4Message} 
               onChange={(e) => setSm4Message(e.target.value)}
+              onContextMenu={(e) => openMenu(e, sm4Message, setSm4Message, false)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm4Message, setSm4Message, false)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="输入要加密的消息" 
               style={{
                 width: '100%',
@@ -990,6 +1164,13 @@ function App() {
             <textarea 
               value={sm4Encrypted} 
               onChange={(e) => setSm4Encrypted(e.target.value)}
+              onContextMenu={(e) => openMenu(e, sm4Encrypted, setSm4Encrypted, false)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm4Encrypted, setSm4Encrypted, false)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="输入加密结果 (hex)" 
               style={{
                 width: '100%',
@@ -1010,6 +1191,13 @@ function App() {
             <textarea 
               value={sm4Decrypted} 
               readOnly
+              onContextMenu={(e) => openMenu(e, sm4Decrypted, setSm4Decrypted, true)}
+              onTouchStart={(e) => {
+                const touchTimer = setTimeout(() => {
+                  openMenu(e, sm4Decrypted, setSm4Decrypted, true)
+                }, 500)
+                return () => clearTimeout(touchTimer)
+              }}
               placeholder="解密结果将显示在这里" 
               style={{
                 width: '100%',
@@ -1078,6 +1266,13 @@ function App() {
                 <textarea 
                   value={utf8Input} 
                   onChange={(e) => setUtf8Input(e.target.value)}
+                  onContextMenu={(e) => openMenu(e, utf8Input, setUtf8Input, false)}
+                  onTouchStart={(e) => {
+                    const touchTimer = setTimeout(() => {
+                      openMenu(e, utf8Input, setUtf8Input, false)
+                    }, 500)
+                    return () => clearTimeout(touchTimer)
+                  }}
                   placeholder="输入 UTF8 字符串" 
                   style={{ 
                     height: '150px',
@@ -1115,6 +1310,13 @@ function App() {
                 <textarea 
                   value={hexInput} 
                   onChange={(e) => setHexInput(e.target.value)}
+                  onContextMenu={(e) => openMenu(e, hexInput, setHexInput, false)}
+                  onTouchStart={(e) => {
+                    const touchTimer = setTimeout(() => {
+                      openMenu(e, hexInput, setHexInput, false)
+                    }, 500)
+                    return () => clearTimeout(touchTimer)
+                  }}
                   placeholder="输入 hex 字符串" 
                   style={{ 
                     height: '150px',
@@ -1158,6 +1360,13 @@ function App() {
                 <textarea 
                   value={base64Input} 
                   onChange={(e) => setBase64Input(e.target.value)}
+                  onContextMenu={(e) => openMenu(e, base64Input, setBase64Input, false)}
+                  onTouchStart={(e) => {
+                    const touchTimer = setTimeout(() => {
+                      openMenu(e, base64Input, setBase64Input, false)
+                    }, 500)
+                    return () => clearTimeout(touchTimer)
+                  }}
                   placeholder="输入 Base64 字符串" 
                   style={{ 
                     height: '150px',
@@ -1195,6 +1404,13 @@ function App() {
                 <textarea 
                   value={hexInput} 
                   onChange={(e) => setHexInput(e.target.value)}
+                  onContextMenu={(e) => openMenu(e, hexInput, setHexInput, false)}
+                  onTouchStart={(e) => {
+                    const touchTimer = setTimeout(() => {
+                      openMenu(e, hexInput, setHexInput, false)
+                    }, 500)
+                    return () => clearTimeout(touchTimer)
+                  }}
                   placeholder="输入 hex 字符串" 
                   style={{ 
                     height: '150px',
@@ -1333,6 +1549,58 @@ function App() {
         </div>
       )}
       
+      {/* 功能菜单 */}
+      {menuVisible && currentInput && (
+        <div 
+          style={{
+            position: 'fixed',
+            left: menuPosition.x,
+            top: menuPosition.y,
+            backgroundColor: '#2d2d2d',
+            border: '1px solid #333',
+            borderRadius: '4px',
+            boxShadow: '0 2px 8px rgba(0, 0, 0, 0.3)',
+            zIndex: 1000,
+            minWidth: '150px'
+          }}
+        >
+          <div 
+            style={{
+              padding: '8px 12px',
+              cursor: 'pointer',
+              color: '#e0e0e0',
+              borderBottom: '1px solid #333'
+            }}
+            onClick={handleClear}
+          >
+            清空
+          </div>
+          <div 
+            style={{
+              padding: '8px 12px',
+              cursor: 'pointer',
+              color: '#e0e0e0',
+              borderBottom: '1px solid #333'
+            }}
+            onClick={handleCopyAll}
+          >
+            复制全部
+          </div>
+          {!currentInput.readOnly && (
+            <div 
+              style={{
+                padding: '8px 12px',
+                cursor: 'pointer',
+                color: '#e0e0e0'
+              }}
+              onClick={handlePaste}
+            >
+              粘贴覆盖
+            </div>
+          )}
+        </div>
+      )}
+      
       {/* 页脚 */}
       <footer style={{ marginTop: '2rem', padding: '1rem', borderTop: '1px solid #333', textAlign: 'center', color: '#e0e0e0' }}>
         <p>© 2026 安全算法计算工具</p>