diff --git a/app/Http/Controllers/ChatController.php b/app/Http/Controllers/ChatController.php
index 0c437fd..8e58efb 100644
--- a/app/Http/Controllers/ChatController.php
+++ b/app/Http/Controllers/ChatController.php
@@ -362,7 +362,7 @@ class ChatController extends Controller
 
         // 1. 过滤净化消息体
         $pureContent = $this->filter->filter($data['content'] ?? '');
-        if (empty($pureContent)) {
+        if ($pureContent === '') {
             return response()->json(['status' => 'error', 'message' => '消息内容不能为空或不合法。'], 422);
         }
 
diff --git a/app/Services/MessageFilterService.php b/app/Services/MessageFilterService.php
index 153e2dd..959be17 100644
--- a/app/Services/MessageFilterService.php
+++ b/app/Services/MessageFilterService.php
@@ -28,7 +28,7 @@ class MessageFilterService
      */
     public function filter(string $content): string
     {
-        if (empty($content)) {
+        if ($content === '') {
             return '';
         }
 
diff --git a/resources/views/chat/partials/scripts.blade.php b/resources/views/chat/partials/scripts.blade.php
index c923d15..58ce407 100644
--- a/resources/views/chat/partials/scripts.blade.php
+++ b/resources/views/chat/partials/scripts.blade.php
@@ -725,7 +725,8 @@
                 const verbStr = msg.action ?
                     buildActionStr(msg.action, fromHtml, toHtml, '悄悄说') :
                     `${fromHtml}对${toHtml}悄悄说：`;
-                html = `<span class="msg-secret">${headImg}${verbStr}${msg.content}</span>`;
+                html =
+                    `${headImg}<span class="msg-secret">${verbStr}</span><span class="msg-content" style="color: ${fontColor}; font-style: italic;">${msg.content}</span>`;
             }
         } else if (msg.to_user && msg.to_user !== '大家') {
             // 对特定对象说话
diff --git a/tests/Feature/ChatControllerTest.php b/tests/Feature/ChatControllerTest.php
index 9a09e46..8d3e3c2 100644
--- a/tests/Feature/ChatControllerTest.php
+++ b/tests/Feature/ChatControllerTest.php
@@ -67,6 +67,39 @@ class ChatControllerTest extends TestCase
         $this->assertTrue($found, 'Message not found in Redis');
     }
 
+    public function test_can_send_zero_message_content(): void
+    {
+        $room = Room::create(['room_name' => 'test_send_zero']);
+        $user = User::factory()->create();
+
+        $this->actingAs($user)->get(route('chat.room', $room->id));
+
+        $response = $this->actingAs($user)->postJson(route('chat.send', $room->id), [
+            'to_user' => '大家',
+            'content' => '0',
+            'is_secret' => false,
+            'font_color' => '#000000',
+            'action' => '',
+        ]);
+
+        $response->assertOk();
+        $response->assertJson(['status' => 'success']);
+
+        $messages = Redis::lrange("room:{$room->id}:messages", 0, -1);
+        $found = false;
+
+        foreach ($messages as $msgJson) {
+            $msg = json_decode($msgJson, true);
+
+            if ($msg['from_user'] === $user->username && $msg['content'] === '0') {
+                $found = true;
+                break;
+            }
+        }
+
+        $this->assertTrue($found, 'Zero message not found in Redis');
+    }
+
     public function test_can_trigger_heartbeat()
     {
         $room = Room::create(['room_name' => 'test_hb']);