diff --git a/web/src/components/errorPreview/index.vue b/web/src/components/errorPreview/index.vue
index d3d99b0f8a..b05eeca989 100644
--- a/web/src/components/errorPreview/index.vue
+++ b/web/src/components/errorPreview/index.vue
@@ -1,13 +1,13 @@
 <template>
   <div 
-    class="fixed inset-0 bg-black/40 flex items-center justify-center z-[999]"
+    class="fixed inset-0 bg-black/40 dark:bg-black/60 flex items-center justify-center z-[999]"
     @click.self="closeModal"
   >
-    <div class="bg-white rounded-xl shadow-dialog w-full max-w-md mx-4 transform transition-all duration-300 ease-in-out">
+    <div class="bg-white dark:bg-gray-800 rounded-xl shadow-dialog dark:shadow-lg w-full max-w-md mx-4 transform transition-all duration-300 ease-in-out border border-transparent dark:border-gray-700">
       <!-- 弹窗头部 -->
-      <div class="p-5 border-b border-gray-100 flex justify-between items-center">
-        <h3 class="text-lg font-semibold text-gray-800">{{ displayData.title }}</h3>
-        <div class="text-gray-400 hover:text-gray-600 transition-colors cursor-pointer" @click="closeModal">
+      <div class="p-5 border-b border-gray-100 dark:border-gray-700 flex justify-between items-center">
+        <h3 class="text-lg font-semibold text-gray-800 dark:text-gray-100">{{ displayData.title }}</h3>
+        <div class="text-gray-400 dark:text-gray-300 hover:text-gray-600 dark:hover:text-gray-200 transition-colors cursor-pointer" @click="closeModal">
           <close class="h-6 w-6" />
         </div>
       </div>
@@ -16,36 +16,36 @@
       <div class="p-6 pt-0">
         <!-- 错误类型 -->
         <div class="mb-4">
-          <div class="text-xs font-medium text-gray-500 uppercase mb-2">错误类型</div>
+          <div class="text-xs font-medium text-gray-500 dark:text-gray-400 uppercase mb-2">错误类型</div>
           <div class="flex items-center gap-2">
-            <lock v-if="displayData.icon === 'lock'" class="text-red-500 w-5 h-5" />
-            <warn v-if="displayData.icon === 'warn'" class="text-red-500 w-5 h-5" />
-            <server v-if="displayData.icon === 'server'" class="text-red-500 w-5 h-5" />
-            <span class="font-medium text-gray-800">{{ displayData.type }}</span>
+            <lock v-if="displayData.icon === 'lock'" :class="['w-5 h-5', displayData.color]" />
+            <warn v-if="displayData.icon === 'warn'" :class="['w-5 h-5', displayData.color]" />
+            <server v-if="displayData.icon === 'server'" :class="['w-5 h-5', displayData.color]" />
+            <span class="font-medium text-gray-800 dark:text-gray-100">{{ displayData.type }}</span>
           </div>
         </div>
         
         <!-- 具体错误 -->
         <div class="mb-6">
-          <div class="text-xs font-medium text-gray-500 uppercase mb-2">具体错误</div>
-          <div class="bg-gray-100 rounded-lg p-3 text-sm text-gray-700 leading-relaxed">
+          <div class="text-xs font-medium text-gray-500 dark:text-gray-400 uppercase mb-2">具体错误</div>
+          <div class="bg-gray-100 dark:bg-gray-900/40 rounded-lg p-3 text-sm text-gray-700 dark:text-gray-200 leading-relaxed">
             {{ displayData.message }}
           </div>
         </div>
         
         <!-- 提示信息 -->
         <div v-if="displayData.tips">
-          <div class="text-xs font-medium text-gray-500 uppercase mb-2">提示</div>
+          <div class="text-xs font-medium text-gray-500 dark:text-gray-400 uppercase mb-2">提示</div>
           <div class="flex items-center gap-2">
-            <idea class="text-blue-500 w-5 h-5" />
-            <p class="text-sm text-gray-600">{{ displayData.tips }}</p>
+            <idea class="text-blue-500 dark:text-blue-400 w-5 h-5" />
+            <p class="text-sm text-gray-600 dark:text-gray-300">{{ displayData.tips }}</p>
           </div>
         </div>
       </div>
       
       <!-- 弹窗底部 -->
-      <div class="py-2 px-4 border-t border-gray-100 flex justify-end">
-        <div class="px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors font-medium text-sm shadow-sm cursor-pointer" @click="handleConfirm">
+      <div class="py-2 px-4 border-t border-gray-100 dark:border-gray-700 flex justify-end">
+        <div class="px-4 py-2 bg-blue-600 dark:bg-blue-500 text-white dark:text-gray-100 rounded-lg hover:bg-blue-700 dark:hover:bg-blue-600 transition-colors font-medium text-sm shadow-sm cursor-pointer" @click="handleConfirm">
           确定
         </div>
       </div>
@@ -70,28 +70,28 @@ const presetErrors = {
     title: '检测到接口错误',
     type: '服务器发生内部错误',
     icon: 'server',
-    color: 'text-red-500',
+    color: 'text-red-500 dark:text-red-400',
     tips: '此类错误内容常见于后台panic，请先查看后台日志，如果影响您正常使用可强制登出清理缓存'
   },
   404: {
     title: '资源未找到',
     type: 'Not Found',
     icon: 'warn',
-    color: 'text-orange-500',
+    color: 'text-orange-500 dark:text-orange-400',
     tips: '此类错误多为接口未注册（或未重启）或者请求路径（方法）与api路径（方法）不符--如果为自动化代码请检查是否存在空格'
   },
   401: {
     title: '身份认证失败',
     type: '身份令牌无效',
     icon: 'lock',
-    color: 'text-purple-500',
+    color: 'text-purple-500 dark:text-purple-400',
     tips: '您的身份认证已过期或无效，请重新登录。'
   },
   'network': {
     title: '网络错误',
     type: 'Network Error',
     icon: 'fa-wifi-slash',
-    color: 'text-gray-500',
+    color: 'text-gray-500 dark:text-gray-400',
     tips: '无法连接到服务器，请检查您的网络连接。'
   }
 };
@@ -109,7 +109,7 @@ const displayData = computed(() => {
     title: '未知错误',
     type: '检测到请求错误',
     icon: 'fa-question-circle',
-    color: 'text-gray-400',
+    color: 'text-gray-400 dark:text-gray-300',
     message: props.errorData.message || '发生了一个未知错误。',
     tips: '请检查控制台获取更多信息。'
   };
diff --git a/web/src/utils/request.js b/web/src/utils/request.js
index 1c62bd311b..9dbc8d46fb 100644
--- a/web/src/utils/request.js
+++ b/web/src/utils/request.js
@@ -124,7 +124,8 @@ service.interceptors.request.use(
 )
 
 function getErrorMessage(error) {
-  return error.response?.data?.msg || '请求失败'
+  // 优先级： 响应体中的 msg > statusText > 默认消息
+  return error.response?.data?.msg || error.response?.statusText || '请求失败'
 }
 
 // http response 拦截器
diff --git a/web/src/view/login/index.vue b/web/src/view/login/index.vue
index 1048004f71..6bb42e826f 100644
--- a/web/src/view/login/index.vue
+++ b/web/src/view/login/index.vue
@@ -138,6 +138,7 @@
   })
 
   const router = useRouter()
+  const captchaRequiredLength = ref(6)
   // 验证函数
   const checkUsername = (rule, value, callback) => {
     if (value.length < 5) {
@@ -153,19 +154,36 @@
       callback()
     }
   }
+  const checkCaptcha = (rule, value, callback) => {
+    if (!loginFormData.openCaptcha) {
+      return callback()
+    }
+    const sanitizedValue = (value || '').replace(/\s+/g, '')
+    if (!sanitizedValue) {
+      return callback(new Error('请输入验证码'))
+    }
+    if (!/^\d+$/.test(sanitizedValue)) {
+      return callback(new Error('验证码须为数字'))
+    }
+    if (sanitizedValue.length < captchaRequiredLength.value) {
+      return callback(
+        new Error(`请输入至少${captchaRequiredLength.value}位数字验证码`)
+      )
+    }
+    if (sanitizedValue !== value) {
+      loginFormData.captcha = sanitizedValue
+    }
+    callback()
+  }
 
   // 获取验证码
   const loginVerify = async () => {
     const ele = await captcha()
-    rules.captcha.push({
-      max: ele.data.captchaLength,
-      min: ele.data.captchaLength,
-      message: `请输入${ele.data.captchaLength}位验证码`,
-      trigger: 'blur'
-    })
-    picPath.value = ele.data.picPath
-    loginFormData.captchaId = ele.data.captchaId
-    loginFormData.openCaptcha = ele.data.openCaptcha
+    const lengthFromServer = Number(ele.data?.captchaLength) || 0
+    captchaRequiredLength.value = Math.max(6, lengthFromServer)
+    picPath.value = ele.data?.picPath
+    loginFormData.captchaId = ele.data?.captchaId
+    loginFormData.openCaptcha = ele.data?.openCaptcha
   }
   loginVerify()
 
@@ -182,12 +200,7 @@
   const rules = reactive({
     username: [{ validator: checkUsername, trigger: 'blur' }],
     password: [{ validator: checkPassword, trigger: 'blur' }],
-    captcha: [
-      {
-        message: '验证码格式不正确',
-        trigger: 'blur'
-      }
-    ]
+    captcha: [{ validator: checkCaptcha, trigger: 'blur' }]
   })
 
   const userStore = useUserStore()
@@ -203,7 +216,6 @@
           message: '请正确填写登录信息',
           showClose: true
         })
-        await loginVerify()
         return false
       }