diff --git a/src/api/routes.py b/src/api/routes.py
index 762b4c5..fe9ee86 100644
--- a/src/api/routes.py
+++ b/src/api/routes.py
@@ -156,8 +156,18 @@ async def get_status(task_id: str, db_session: AsyncSession = Depends(get_db_ses
 
     geometry_json: Optional[Dict[str, Any]] = None
     if file_with_data.get("geometry_data"):
-        # save_geometry_data 支持两种格式，这里直接拿回来的就是几何字典
-        geometry_json = file_with_data["geometry_data"]
+        # save_geometry_data 保存时可能有两种格式：
+        # 1. 直接保存 geometry_data 字典
+        # 2. 保存 {"geometry_data": {...}} 格式
+        # get_stp_file_with_data 返回的是从RustFS下载的原始JSON
+        geo_raw = file_with_data["geometry_data"]
+        if isinstance(geo_raw, dict):
+            # 如果是包装格式，提取内部数据
+            if "geometry_data" in geo_raw:
+                geometry_json = geo_raw["geometry_data"]
+            else:
+                # 直接就是几何数据字典
+                geometry_json = geo_raw
 
     cavity_json: Optional[Dict[str, Any]] = file_with_data.get("mold_cavity_data")
 
diff --git a/static/style.css b/static/style.css
index 010855a..64fdfac 100644
--- a/static/style.css
+++ b/static/style.css
@@ -790,7 +790,8 @@ body {
     color: #e5e7eb;
 }
 
-.upload-dropzone:hover {
+.upload-dropzone:hover,
+.upload-dropzone.drag-over {
     border-color: #60a5fa;
     background: linear-gradient(135deg, rgba(15, 23, 42, 1), rgba(37, 99, 235, 0.6));
 }
@@ -800,6 +801,23 @@ body {
     margin-bottom: 6px;
 }
 
+.clear-file-btn {
+    margin-top: 8px;
+    padding: 4px 12px;
+    font-size: 0.8rem;
+    background: rgba(239, 68, 68, 0.2);
+    color: #fca5a5;
+    border: 1px solid rgba(239, 68, 68, 0.4);
+    border-radius: 6px;
+    cursor: pointer;
+    transition: all 0.2s ease;
+}
+
+.clear-file-btn:hover {
+    background: rgba(239, 68, 68, 0.3);
+    border-color: rgba(239, 68, 68, 0.6);
+}
+
 .upload-btn {
     background: linear-gradient(135deg, #3b82f6, #6366f1);
     color: white;
@@ -947,6 +965,11 @@ body {
     text-transform: none;
 }
 
+.status-pending {
+    background: rgba(148, 163, 184, 0.15);
+    color: #94a3b8;
+}
+
 .status-processing {
     background: rgba(250, 204, 21, 0.15);
     color: #facc15;
diff --git a/static/vue-app.js b/static/vue-app.js
index 7dbe93a..2e7d671 100644
--- a/static/vue-app.js
+++ b/static/vue-app.js
@@ -287,12 +287,26 @@ const DashboardView = {
 
     const startPolling = async (taskId) => {
       state.polling = true;
+      let pollCount = 0;
+      const maxPolls = 300; // 最多轮询5分钟（300秒）
+      
       const poll = async () => {
         try {
+          pollCount++;
           const res = await fetch(`/status/${taskId}`, { method: "POST" });
-          if (!res.ok) {
-            throw new Error("查询任务状态失败");
+          
+          if (res.status === 404) {
+            // 任务不存在，停止轮询
+            state.polling = false;
+            state.error = "任务不存在或已被删除";
+            addNotification("任务不存在或已被删除", 'error');
+            return;
           }
+          
+          if (!res.ok) {
+            throw new Error(`查询任务状态失败: ${res.status} ${res.statusText}`);
+          }
+          
           const task = await res.json();
           state.currentTask = task;
 
@@ -307,6 +321,11 @@ const DashboardView = {
             const errorMsg = task.error || "未知错误";
             state.error = `分析失败: ${errorMsg}`;
             addNotification(`分析失败: ${errorMsg}`, 'error');
+          } else if (pollCount >= maxPolls) {
+            // 超时停止轮询
+            state.polling = false;
+            state.error = "任务处理超时，请稍后查看结果";
+            addNotification("任务处理超时，请稍后查看结果", 'warning');
           } else {
             setTimeout(poll, 1000);
           }
@@ -365,50 +384,57 @@ const DashboardView = {
           <p class="card-subtitle">上传后系统会自动解析几何、生成模具型腔并计算关键工艺参数。</p>
 
           <div class="upload-panel">
-            <label class="upload-dropzone">
+            <label 
+              class="upload-dropzone" 
+              :class="{ 'drag-over': state.dragOver }"
+              @dragover.prevent="handleDragOver"
+              @dragleave.prevent="handleDragLeave"
+              @drop.prevent="handleDrop"
+            >
               <input type="file" accept=".stp,.step" @change="handleFileChange" hidden />
               <div class="upload-icon">📂</div>
-              <div v-if="!selectedFile">
+              <div v-if="!state.selectedFile">
                 <h3>点击选择或拖拽文件到此处</h3>
                 <p>最大 100MB，支持 .stp / .step</p>
               </div>
               <div v-else>
                 <h3>已选择文件：</h3>
-                <p><strong>{{ selectedFile.name }}</strong></p>
-                <p>大小：{{ formatFileSize(selectedFile.size) }}</p>
+                <p><strong>{{ state.selectedFile.name }}</strong></p>
+                <p>大小：{{ formatFileSize(state.selectedFile.size) }}</p>
+                <button class="clear-file-btn" @click.stop="clearFile">清除</button>
               </div>
             </label>
 
             <button
               class="upload-btn"
-              :disabled="!selectedFile || uploading"
+              :disabled="!state.selectedFile || state.uploading"
               @click="uploadFile"
             >
-              <span v-if="!uploading">开始分析</span>
+              <span v-if="!state.uploading">开始分析</span>
               <span v-else>正在上传...</span>
             </button>
 
-            <p v-if="error" class="error-text">{{ error }}</p>
+            <p v-if="state.error" class="error-text">{{ state.error }}</p>
           </div>
 
-          <div v-if="currentTask" class="card current-task">
+          <div v-if="state.currentTask" class="card current-task">
             <h3>当前任务</h3>
             <div class="info-row">
-              <span>任务 ID：</span><span>{{ currentTask.task_id }}</span>
+              <span>任务 ID：</span><span>{{ state.currentTask.task_id }}</span>
             </div>
             <div class="info-row">
-              <span>文件名：</span><span>{{ currentTask.filename || 'N/A' }}</span>
+              <span>文件名：</span><span>{{ state.currentTask.filename || 'N/A' }}</span>
             </div>
             <div class="info-row">
-              <span>文件大小：</span><span>{{ currentTask.file_size ? formatFileSize(currentTask.file_size) : 'N/A' }}</span>
+              <span>文件大小：</span><span>{{ state.currentTask.file_size ? formatFileSize(state.currentTask.file_size) : 'N/A' }}</span>
             </div>
             <div class="info-row">
               <span>状态：</span>
-              <span class="status-pill" :class="'status-' + currentTask.status">
-                {{ statusText(currentTask.status) }}
+              <span class="status-pill" :class="getStatusClass(state.currentTask.status)">
+                {{ statusText(state.currentTask.status) }}
               </span>
             </div>
-            <div v-if="polling" class="small-hint">正在后台分析，请稍候，完成后会跳转到结果页。</div>
+            <div v-if="state.polling" class="small-hint">正在后台分析，请稍候，完成后会跳转到结果页。</div>
           </div>
         </div>