diff --git a/app/Helpers.php b/app/Helpers.php
index 9f2f158..d886364 100644
--- a/app/Helpers.php
+++ b/app/Helpers.php
@@ -6,32 +6,37 @@ if (! function_exists('create_log')) {
     /**
      * Append a line to public/log/{type}/Ymd.log
      *
+     * Failures are swallowed so logging never breaks the HTTP request
+     * (e.g. www cannot mkdir under public/ on a fresh Baota deploy).
+     *
      * @param  array|string  $str
      */
     function create_log($str, string $type = 'c2'): void
     {
-        $str = is_array($str) ? json_encode($str, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) : (string) $str;
-        $logPath = public_path('log/'.$type);
-        if (! is_dir($logPath)) {
-            $old = umask(0);
-            mkdir($logPath, 0777, true);
-            umask($old);
-        }
-
-        $logName = $logPath.'/'.date('Ymd').'.log';
         try {
-            $url = request()->getRequestUri();
-        } catch (\Throwable) {
-            $url = $_SERVER['REQUEST_URI'] ?? '';
-        }
-        $logStr = date('Y-m-d H:i:s').'  '.$url.'  '.$str."\r\n\r\n";
-        $isNew = ! file_exists($logName);
-        file_put_contents($logName, $logStr, FILE_APPEND);
-        if ($isNew) {
-            try {
-                chmod($logName, 0777);
-            } catch (\Throwable) {
+            $str = is_array($str) ? json_encode($str, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) : (string) $str;
+            $type = preg_replace('/[^a-z0-9_-]+/i', '', $type) ?: 'c2';
+            $logPath = public_path('log/'.$type);
+            if (! is_dir($logPath) && ! @mkdir($logPath, 0775, true) && ! is_dir($logPath)) {
+                return;
             }
+
+            $logName = $logPath.'/'.date('Ymd').'.log';
+            try {
+                $url = request()->getRequestUri();
+            } catch (\Throwable) {
+                $url = $_SERVER['REQUEST_URI'] ?? '';
+            }
+            $logStr = date('Y-m-d H:i:s').'  '.$url.'  '.$str."\r\n\r\n";
+            $isNew = ! file_exists($logName);
+            if (@file_put_contents($logName, $logStr, FILE_APPEND) === false) {
+                return;
+            }
+            if ($isNew) {
+                @chmod($logName, 0664);
+            }
+        } catch (\Throwable) {
+            // never break the request for logging
         }
     }
 }
diff --git a/docs/BAOTA_DEPLOY.md b/docs/BAOTA_DEPLOY.md
index c3ffb88..6dda357 100644
--- a/docs/BAOTA_DEPLOY.md
+++ b/docs/BAOTA_DEPLOY.md
@@ -446,6 +446,19 @@ tail -n 80 /www/server/php/82/var/log/php-fpm.log
 
 
 
+### `mkdir(): Permission denied` at `Helpers.php` / `public/log`
+
+C2 中间件会写 `public/log/c2/Ymd.log`。站点运行用户（宝塔多为 `www`）对 `public/log` 无写权限时会报错。
+
+```bash
+cd /www/wwwroot/coruna-lab
+mkdir -p public/log/c2
+chown -R www:www public/log storage bootstrap/cache
+chmod -R ug+rwx public/log storage bootstrap/cache
+```
+
+同时确认网站「运行目录 / 用户」与上述属主一致。部署后建议立刻执行一次，避免首个 C2 请求踩坑。
+
 ### Composer：`putenv()` undefined
 
 PHP「禁用函数」含 `putenv`。在 PHP 8.2 设置里移除后重试。
diff --git a/resources/views/admin/channels/index.blade.php b/resources/views/admin/channels/index.blade.php
index a6b33c4..6353fe8 100644
--- a/resources/views/admin/channels/index.blade.php
+++ b/resources/views/admin/channels/index.blade.php
@@ -178,7 +178,7 @@ layui.use(['table', 'form', 'layer'], function () {
         '<option value="test"' + ((values.support_template || 'test') === 'test' ? ' selected' : '') + '>test（含 HUD 进度页）</option>' +
         '<option value="blank"' + (values.support_template === 'blank' ? ' selected' : '') + '>blank（空白页）</option>' +
         '</select>' +
-        '<div class="layui-form-mid layui-word-aux">控制生成的 support.html：test 为当前 source；blank 去掉 HUD 展示</div></div></div>'
+        '<div class="layui-form-mid layui-word-aux">控制生成的 support.html：test=HUD；blank=空白</div></div></div>'
       : '';
 
     layer.open({