pdf upload

frontend/src/components/competition/ProjectSubmission.jsx

@@ -146,11 +146,43 @@ const ProjectSubmission = ({ competitionId, initialValues, onCancel, onSuccess }
         
         {/* File Upload Section - Only visible if project exists */}
         {initialValues?.id && (
-            <Form.Item label="项目附件 (PPT/PDF/视频)">
+            <Form.Item label="项目附件 (PPT/PDF/视频/图片)">
                 <Upload 
                     customRequest={handleUpload}
                     listType="picture"
                     maxCount={5}
+                    accept=".ppt,.pptx,.pdf,.mp4,.mov,.avi,.webm,.jpg,.jpeg,.png,.gif,.webp,.doc,.docx"
+                    beforeUpload={(file) => {
+                        const allowedTypes = [
+                            'application/vnd.ms-powerpoint',
+                            'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+                            'application/pdf',
+                            'video/mp4',
+                            'video/quicktime',
+                            'video/x-msvideo',
+                            'video/webm',
+                            'image/jpeg',
+                            'image/png',
+                            'image/gif',
+                            'image/webp',
+                            'application/msword',
+                            'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
+                        ];
+                        const allowedExtensions = ['ppt', 'pptx', 'pdf', 'mp4', 'mov', 'avi', 'webm', 'jpg', 'jpeg', 'png', 'gif', 'webp', 'doc', 'docx'];
+                        const fileExt = file.name.split('.').pop()?.toLowerCase();
+                        
+                        if (!allowedExtensions.includes(fileExt)) {
+                            message.error('不支持的文件格式！请上传 PPT、PDF、视频或图片文件');
+                            return Upload.LIST_IGNORE;
+                        }
+                        
+                        const isLt50M = file.size / 1024 / 1024 < 50;
+                        if (!isLt50M) {
+                            message.error('文件大小不能超过 50MB');
+                            return Upload.LIST_IGNORE;
+                        }
+                        return false;
+                    }}
                 >
                     <Button icon={<CloudUploadOutlined />}>上传文件 (最大50MB)</Button>
                 </Upload>