diff --git a/.vscode/ftp-kr.sync.cache.json b/.vscode/ftp-kr.sync.cache.json
index e35e7e6..fc542cc 100644
--- a/.vscode/ftp-kr.sync.cache.json
+++ b/.vscode/ftp-kr.sync.cache.json
@@ -40,6 +40,92 @@
               "lmtime": 0,
               "modified": false
             }
+          },
+          "Users": {
+            "UserRepository.php": {
+              "type": "-",
+              "size": 610,
+              "lmtime": 1770653480229,
+              "modified": false
+            }
+          }
+        },
+        "factory": {
+          "class.BackendSites.php": {
+            "type": "-",
+            "size": 2962,
+            "lmtime": 0,
+            "modified": false
+          },
+          "class.Crm.php": {
+            "type": "-",
+            "size": 1863,
+            "lmtime": 0,
+            "modified": false
+          },
+          "class.Cron.php": {
+            "type": "-",
+            "size": 26120,
+            "lmtime": 0,
+            "modified": false
+          },
+          "class.Finances.php": {
+            "type": "-",
+            "size": 16159,
+            "lmtime": 0,
+            "modified": false
+          },
+          "class.Projects.php": {
+            "type": "-",
+            "size": 27476,
+            "lmtime": 0,
+            "modified": false
+          },
+          "class.Tasks.php": {
+            "type": "-",
+            "size": 20921,
+            "lmtime": 0,
+            "modified": false
+          },
+          "class.Users.php": {
+            "type": "-",
+            "size": 2072,
+            "lmtime": 1770654026945,
+            "modified": false
+          },
+          "class.Wiki.php": {
+            "type": "-",
+            "size": 1911,
+            "lmtime": 0,
+            "modified": false
+          }
+        },
+        "Controllers": {
+          "class.TasksController.php": {
+            "type": "-",
+            "size": 567,
+            "lmtime": 0,
+            "modified": false
+          },
+          "TasksController.php": {
+            "type": "-",
+            "size": 3009,
+            "lmtime": 0,
+            "modified": false
+          },
+          "UsersController.php": {
+            "type": "-",
+            "size": 3914,
+            "lmtime": 1770653696575,
+            "modified": false
+          }
+        },
+        "controls": {
+          "class.Users.php": {
+            "type": "-",
+            "size": 4242,
+            "lmtime": 1770653518273,
+            "modified": false
           }
         }
       },
@@ -57,6 +143,12 @@
           "modified": false
         }
       },
+      "CODE_INDEX.md": {
+        "type": "-",
+        "size": 16884,
+        "lmtime": 1770652965090,
+        "modified": false
+      },
       "config.php": {
         "type": "-",
         "size": 1249,
@@ -140,9 +232,74 @@
             "lmtime": 0,
             "modified": false
           }
+        },
+        "users": {
+          "login-form.php": {
+            "type": "-",
+            "size": 3336,
+            "lmtime": 0,
+            "modified": false
+          },
+          "main-view.php": {
+            "type": "-",
+            "size": 2012,
+            "lmtime": 1770653623175,
+            "modified": false
+          },
+          "settings.php": {
+            "type": "-",
+            "size": 3457,
+            "lmtime": 0,
+            "modified": false
+          }
+        },
+        "site": {
+          "layout-cron.php": {
+            "type": "-",
+            "size": 6369,
+            "lmtime": 1770653884637,
+            "modified": false
+          },
+          "layout-logged.php": {
+            "type": "-",
+            "size": 6762,
+            "lmtime": 1770653877600,
+            "modified": false
+          },
+          "layout-unlogged.php": {
+            "type": "-",
+            "size": 986,
+            "lmtime": 0,
+            "modified": false
+          }
+        }
+      },
+      "tests": {
+        "Controllers": {
+          "UsersControllerTest.php": {
+            "type": "-",
+            "size": 1839,
+            "lmtime": 1770653599232,
+            "modified": false
+          }
+        },
+        "Domain": {
+          "Users": {
+            "UserRepositoryTest.php": {
+              "type": "-",
+              "size": 1540,
+              "lmtime": 1770653587539,
+              "modified": false
+            }
+          }
+        },
+        "run.php": {
+          "type": "-",
+          "size": 851,
+          "lmtime": 1770653605021,
+          "modified": false
         }
       },
-      "tests": {},
       "tmp_debug_mail_import.php": {
         "type": "-",
         "size": 1238,
diff --git a/autoload/Domain/Tasks/MailToTaskImporter.php b/autoload/Domain/Tasks/MailToTaskImporter.php
index 0a34310..7e92549 100644
--- a/autoload/Domain/Tasks/MailToTaskImporter.php
+++ b/autoload/Domain/Tasks/MailToTaskImporter.php
@@ -10,6 +10,7 @@ class MailToTaskImporter
 
   private $mdb;
   private $attachments;
+  private $last_ai_error;
 
   public function __construct( $mdb = null )
   {
@@ -22,6 +23,7 @@ class MailToTaskImporter
     }
 
     $this -> attachments = new TaskAttachmentRepository( $this -> mdb );
+    $this -> last_ai_error = '';
   }
 
   public function importFromImap( array $config )
@@ -88,24 +90,38 @@ class MailToTaskImporter
       try
       {
         $content = $this -> extractMessageContent( $imap, $message_no );
+        $ai_used = false;
+        $ai_error_for_log = null;
 
         // Sprawdź czy użyć AI do parsowania
         global $settings;
         $use_ai = isset( $settings['openai_parse_emails'] ) && $settings['openai_parse_emails'] === true;
         $api_key = isset( $settings['openai_api_key'] ) ? trim( (string)$settings['openai_api_key'] ) : '';
+        if ( $use_ai && $api_key === '' )
+        {
+          $ai_error_for_log = 'Brak klucza API OpenAI.';
+          error_log( '[MailToTaskImporter] AI fallback: ' . $ai_error_for_log );
+        }
 
         if ( $use_ai && $api_key !== '' )
         {
-          $model = isset( $settings['openai_model'] ) ? trim( (string)$settings['openai_model'] ) : 'gpt-3.5-turbo';
+          $model = isset( $settings['openai_model'] ) ? trim( (string)$settings['openai_model'] ) : 'gpt-4o-mini';
           $ai_result = $this -> parseWithAI( $api_key, $model, $subject, $content['text'] );
-          if ( $ai_result !== null )
+          if ( is_array( $ai_result ) && isset( $ai_result['task_name'] ) && isset( $ai_result['task_text'] ) )
           {
             $task_name = $ai_result['task_name'];
             $task_text = $ai_result['task_text'];
+            $ai_used = true;
           }
           else
           {
             // Fallback do normalnego parsowania jeśli AI nie zadziała
+            if ( $this -> last_ai_error !== '' )
+            {
+              error_log( '[MailToTaskImporter] AI fallback: ' . $this -> last_ai_error );
+              $ai_error_for_log = $this -> last_ai_error;
+            }
+
             $task_name = trim( $subject ) !== '' ? trim( $subject ) : '(bez tematu)';
             $task_text = $this -> prepareImportedTaskText( $content['text'] );
           }
@@ -161,7 +177,17 @@ class MailToTaskImporter
           $this -> attachments -> uploadFromContent( $task_id, self::TASK_USER_ID, $attachment['name'], $attachment['content'] );
         }
 
-        $this -> saveImportLog( $message_key, $task_id, $sender, $subject, 'imported', null );
+        $import_status = 'imported';
+        $import_error = null;
+        if ( $use_ai && $ai_used )
+          $import_status = 'imported_ai';
+        elseif ( $use_ai && !$ai_used )
+        {
+          $import_status = 'imported_fallback';
+          $import_error = $ai_error_for_log;
+        }
+
+        $this -> saveImportLog( $message_key, $task_id, $sender, $subject, $import_status, $import_error );
         $imported++;
       }
       catch ( \Throwable $e )
@@ -173,7 +199,7 @@ class MailToTaskImporter
       }
 
       $status_tmp = $this -> getImportStatus( $message_key );
-      if ( in_array( $status_tmp, [ 'imported', 'skipped_sender' ], true ) )
+      if ( in_array( $status_tmp, [ 'imported', 'imported_ai', 'imported_fallback', 'skipped_sender' ], true ) )
         @imap_delete( $imap, $message_no );
     }
 
@@ -318,7 +344,7 @@ class MailToTaskImporter
   private function isMessageFinalized( $message_key )
   {
     $status = $this -> getImportStatus( $message_key );
-    return in_array( $status, [ 'imported', 'skipped_sender' ], true );
+    return in_array( $status, [ 'imported', 'imported_ai', 'imported_fallback', 'skipped_sender' ], true );
   }
 
   private function getImportStatus( $message_key )
@@ -675,14 +701,34 @@ class MailToTaskImporter
     return strtolower( $value );
   }
 
-  private function parseWithAI( $api_key, $model, $subject, $raw_content )
+  private function parseWithAI( $api_key, $model, $subject, $raw_content, $attempt = 1 )
   {
+    $this -> last_ai_error = '';
+    $api_key = trim( (string)$api_key );
     $subject = trim( (string)$subject );
     $raw_content = trim( (string)$raw_content );
     $model = trim( (string)$model );
 
+    if ( $api_key === '' )
+    {
+      $this -> last_ai_error = 'Brak klucza API OpenAI.';
+      return null;
+    }
+
     if ( $model === '' )
-      $model = 'gpt-3.5-turbo';
+      $model = 'gpt-4o-mini';
+
+    if ( $raw_content === '' )
+    {
+      $this -> last_ai_error = 'Pusta tresc emaila do analizy AI.';
+      return null;
+    }
+
+    if ( !function_exists( 'curl_init' ) )
+    {
+      $this -> last_ai_error = 'Brak rozszerzenia cURL.';
+      return null;
+    }
 
     // Przygotuj treść do analizy (usuń HTML jesli jest)
     if ( preg_match( '/<\s*[a-z][^>]*>/i', $raw_content ) )
@@ -691,31 +737,54 @@ class MailToTaskImporter
       $raw_content = $this -> cleanBodyText( $raw_content );
     }
 
+    $content_limit = $attempt > 1 ? 1200 : 1800;
     $prompt = "Jesteś asystentem do przetwarzania emaili na zadania w systemie CRM. " .
-              "Na podstawie poniższego tematu i treści emaila, wygeneruj:\n" .
-              "1. Zwięzły, konkretny temat zadania (max 100 znaków)\n" .
-              "2. Czytelny opis zadania zawierający najważniejsze informacje\n\n" .
+              "Na podstawie poniższego tematu i treści emaila wygeneruj zadanie wdrożeniowe, NIE podsumowanie. " .
+              "Opis ma być szczegółową listą rzeczy do wykonania dla zespołu.\n\n" .
+              "Wymagania:\n" .
+              "- Nie pomijaj żadnych wymagań, liczb, zakresów cen, CTA, pól formularza, kroków i terminów.\n" .
+              "- Zamień treść emaila na checklistę implementacyjną.\n" .
+              "- Zachowaj strukturę sekcji i podsekcji.\n" .
+              "- Pisz konkretnie co zmienić, gdzie zmienić i jakie treści dodać.\n" .
+              "- Nie używaj ogólników typu: \"zaktualizować stronę\".\n\n" .
+              "Format pola task_text:\n" .
+              "1) Cel zmiany\n" .
+              "2) Zakres zmian (lista punktów)\n" .
+              "3) Treści do wstawienia (dokładne teksty/liczby)\n" .
+              "4) Zmiany formularza\n" .
+              "5) Wersja sezonowa / warunki wyświetlania\n" .
+              "6) CTA i bonusy\n" .
+              "7) Kryteria akceptacji\n\n" .
               "Temat emaila: " . $subject . "\n\n" .
-              "Treść emaila:\n" . mb_substr( $raw_content, 0, 2000 ) . "\n\n" .
-              "Odpowiedz TYLKO w formacie JSON bez żadnych dodatkowych wyjaśnień:\n" .
-              '{"task_name": "temat zadania", "task_text": "opis zadania"}';
+              "Treść emaila:\n" . mb_substr( $raw_content, 0, $content_limit ) . "\n\n" .
+              "Zwróć TYLKO poprawny JSON:\n" .
+              '{"task_name": "krótki temat zadania", "task_text": "szczegółowa checklista wdrożeniowa"}';
 
     $payload = [
       'model' => $model,
       'messages' => [
         [
           'role' => 'system',
-          'content' => 'Jesteś asystentem do przetwarzania emaili. Odpowiadasz TYLKO w formacie JSON.'
+          'content' => 'Jesteś asystentem do przetwarzania emaili. Odpowiadasz TYLKO w formacie JSON i tworzysz szczegółowe checklisty wdrożeniowe, nie skróty.'
         ],
         [
           'role' => 'user',
           'content' => $prompt
         ]
-      ],
-      'temperature' => 0.3,
-      'max_tokens' => 500
+      ]
     ];
 
+    if ( stripos( $model, 'gpt-5' ) === 0 )
+      $payload['response_format'] = [ 'type' => 'json_object' ];
+
+    if ( stripos( $model, 'gpt-5' ) === 0 )
+      $payload['max_completion_tokens'] = $attempt > 1 ? 1600 : 1000;
+    else
+    {
+      $payload['temperature'] = 0.3;
+      $payload['max_tokens'] = 1200;
+    }
+
     $ch = curl_init( 'https://api.openai.com/v1/chat/completions' );
     curl_setopt_array( $ch, [
       CURLOPT_RETURNTRANSFER => true,
@@ -729,28 +798,87 @@ class MailToTaskImporter
     ] );
 
     $response = curl_exec( $ch );
+    $curl_error = curl_error( $ch );
     $http_code = curl_getinfo( $ch, CURLINFO_HTTP_CODE );
     curl_close( $ch );
 
-    if ( $http_code !== 200 || !$response )
+    if ( $response === false )
+    {
+      $this -> last_ai_error = 'Blad cURL: ' . $curl_error;
       return null;
+    }
+
+    if ( $http_code !== 200 )
+    {
+      $this -> last_ai_error = 'HTTP ' . $http_code . ' z OpenAI: ' . $this -> extractApiErrorMessage( $response );
+      return null;
+    }
+
+    if ( !$response )
+    {
+      $this -> last_ai_error = 'Pusta odpowiedz z OpenAI.';
+      return null;
+    }
 
     $data = json_decode( $response, true );
-    if ( !isset( $data['choices'][0]['message']['content'] ) )
+    if ( !is_array( $data ) )
+    {
+      $this -> last_ai_error = 'Niepoprawny JSON z OpenAI: ' . json_last_error_msg();
       return null;
+    }
 
-    $content = trim( $data['choices'][0]['message']['content'] );
+    if ( isset( $data['error']['message'] ) )
+    {
+      $this -> last_ai_error = 'OpenAI error: ' . (string)$data['error']['message'];
+      return null;
+    }
+
+    if ( !isset( $data['choices'][0] ) || !is_array( $data['choices'][0] ) )
+    {
+      $this -> last_ai_error = 'Brak choices[0] w odpowiedzi OpenAI. RAW: ' . $this -> clipForLog( $response );
+      return null;
+    }
+
+    $choice = $data['choices'][0];
+    $content = $this -> extractModelMessageContent( $choice );
+    if ( $content === '' )
+    {
+      $finish_reason = isset( $choice['finish_reason'] ) ? (string)$choice['finish_reason'] : '(brak)';
+      $refusal = isset( $choice['message']['refusal'] ) ? (string)$choice['message']['refusal'] : '';
+
+      if ( $finish_reason === 'length' && (int)$attempt === 1 )
+      {
+        $retry_content = mb_substr( $raw_content, 0, 1200 );
+        return $this -> parseWithAI( $api_key, $model, $subject, $retry_content, 2 );
+      }
+
+      $error = 'Pusta tresc odpowiedzi modelu. finish_reason=' . $finish_reason;
+      if ( $refusal !== '' )
+        $error .= ', refusal=' . $this -> clipForLog( $refusal );
+
+      $this -> last_ai_error = $error . '. RAW: ' . $this -> clipForLog( $response );
+      return null;
+    }
 
     // Usuń markdown code block jeśli jest
     $content = preg_replace( '/```json\s*|\s*```/', '', $content );
     $content = trim( $content );
 
+    // Jeśli model zwrócił JSON z komentarzem wokół, wyciągnij tylko obiekt.
+    $json_start = strpos( $content, '{' );
+    $json_end = strrpos( $content, '}' );
+    if ( $json_start !== false && $json_end !== false && $json_end > $json_start )
+      $content = substr( $content, $json_start, $json_end - $json_start + 1 );
+
     $parsed = json_decode( $content, true );
     if ( !is_array( $parsed ) || !isset( $parsed['task_name'] ) || !isset( $parsed['task_text'] ) )
+    {
+      $this -> last_ai_error = 'Niepoprawny JSON z modelu. Odpowiedz: ' . $this -> clipForLog( $content );
       return null;
+    }
 
-    $task_name = trim( (string)$parsed['task_name'] );
-    $task_text = trim( (string)$parsed['task_text'] );
+    $task_name = $this -> normalizeAiTextValue( $parsed['task_name'] );
+    $task_text = $this -> normalizeAiTextValue( $parsed['task_text'] );
 
     if ( $task_name === '' )
       $task_name = '(bez tematu)';
@@ -766,4 +894,92 @@ class MailToTaskImporter
       'task_text' => $task_text
     ];
   }
+
+  private function extractApiErrorMessage( $response )
+  {
+    $data = json_decode( (string)$response, true );
+    if ( is_array( $data ) && isset( $data['error']['message'] ) )
+      return (string)$data['error']['message'];
+
+    return $this -> clipForLog( $response );
+  }
+
+  private function extractModelMessageContent( array $choice )
+  {
+    if ( isset( $choice['message']['content'] ) && is_string( $choice['message']['content'] ) )
+      return trim( $choice['message']['content'] );
+
+    if ( isset( $choice['message']['content'] ) && is_array( $choice['message']['content'] ) )
+    {
+      $chunks = [];
+      foreach ( $choice['message']['content'] as $part )
+      {
+        if ( is_string( $part ) )
+          $chunks[] = $part;
+        elseif ( is_array( $part ) )
+        {
+          if ( isset( $part['text'] ) && is_string( $part['text'] ) )
+            $chunks[] = $part['text'];
+          elseif ( isset( $part['text']['value'] ) && is_string( $part['text']['value'] ) )
+            $chunks[] = $part['text']['value'];
+        }
+      }
+
+      return trim( implode( "\n", $chunks ) );
+    }
+
+    if ( isset( $choice['message']['tool_calls'][0]['function']['arguments'] ) && is_string( $choice['message']['tool_calls'][0]['function']['arguments'] ) )
+      return trim( $choice['message']['tool_calls'][0]['function']['arguments'] );
+
+    if ( isset( $choice['message']['function_call']['arguments'] ) && is_string( $choice['message']['function_call']['arguments'] ) )
+      return trim( $choice['message']['function_call']['arguments'] );
+
+    return '';
+  }
+
+  private function clipForLog( $value, $limit = 600 )
+  {
+    $text = trim( (string)$value );
+    if ( $text === '' )
+      return '';
+
+    return mb_substr( $text, 0, (int)$limit );
+  }
+
+  private function normalizeAiTextValue( $value )
+  {
+    if ( is_string( $value ) )
+      return trim( $value );
+
+    if ( is_numeric( $value ) || is_bool( $value ) )
+      return trim( (string)$value );
+
+    if ( is_array( $value ) )
+    {
+      $lines = [];
+      foreach ( $value as $item )
+      {
+        $item_text = $this -> normalizeAiTextValue( $item );
+        if ( $item_text !== '' )
+          $lines[] = $item_text;
+      }
+
+      return trim( implode( "\n", $lines ) );
+    }
+
+    if ( is_object( $value ) )
+    {
+      $array_value = json_decode( json_encode( $value ), true );
+      if ( is_array( $array_value ) )
+      {
+        $normalized = $this -> normalizeAiTextValue( $array_value );
+        if ( $normalized !== '' )
+          return $normalized;
+      }
+
+      return trim( json_encode( $value ) );
+    }
+
+    return '';
+  }
 }
diff --git a/autoload/factory/class.Tasks.php b/autoload/factory/class.Tasks.php
index fc8fe6d..9002811 100644
--- a/autoload/factory/class.Tasks.php
+++ b/autoload/factory/class.Tasks.php
@@ -58,6 +58,7 @@ class Tasks
 
   static public function get_tasks_gantt( $user_id, $projects = null, $users = null ) {
     global $mdb;
+    $data = [];
 
     if ( $users ) {
       $sql = ' AND id IN (SELECT task_id FROM task_user WHERE user_id IN (' . implode( ',', $users ) . ')) ';
@@ -95,6 +96,7 @@ class Tasks
       // custom class
       // if ( $task['date_start'] <= date( 'Y-m-d H:i:s' ) )
       //   $task_json['custom_class'] = 'gantt-task-backlog';
+      $task_json['custom_class'] = '';
 
       if ( $task['parent_id'] )
         $task_json['dependencies'] = $task['parent_id'];
diff --git a/config.php b/config.php
index 8937d0d..74f8faa 100644
--- a/config.php
+++ b/config.php
@@ -22,4 +22,4 @@ $settings['tasks_auto_start_timer'] = false;
 // OpenAI ChatGPT API configuration for email task parsing
 $settings['openai_api_key'] = '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'; // Wklej tutaj swój klucz API OpenAI
 $settings['openai_parse_emails'] = true; // true = użyj AI do parsowania emaili, false = normalne parsowanie
-$settings['openai_model'] = 'gpt-3.5-turbo'; // Model: gpt-3.5-turbo (najtańszy), gpt-4o-mini, gpt-4o, itp.
+$settings['openai_model'] = 'gpt-4o-mini'; // Model: gpt-4o-mini, gpt-4o, gpt-5-nano, itp.
diff --git a/templates/tasks/main_view.php b/templates/tasks/main_view.php
index 9ee4bed..5df726c 100644
--- a/templates/tasks/main_view.php
+++ b/templates/tasks/main_view.php
@@ -156,11 +156,13 @@
     }
     ?>
   ];
-  if ( tasks.length <= 0 ) {
-    tasks = [
+
+  function getEmptyGanttTasks()
+  {
+    return [
       {
-        start: new Date().toISOString().split('T')[0],
-        end: new Date().toISOString().split('T')[0],
+        start: new Date().toISOString().split( 'T' )[0],
+        end: new Date().toISOString().split( 'T' )[0],
         name: "Brak zada&#324; do wy&#347;wietlenia",
         id: "0",
         progress: 100,
@@ -169,6 +171,29 @@
       }
     ];
   }
+
+  function normalizeGanttTasks( tasksData )
+  {
+    if ( Array.isArray( tasksData ) && tasksData.length > 0 )
+      return tasksData;
+
+    return getEmptyGanttTasks();
+  }
+
+  function getSelectedTaskFilters()
+  {
+    return {
+      projects: jQuery( 'input[name="projects"].g-checkbox:checked' ).map(function() {
+        return this.value;
+      }).get(),
+      users: jQuery( 'input[name="users"].g-checkbox:checked' ).map(function() {
+        return this.value;
+      }).get()
+    };
+  }
+
+  tasks = normalizeGanttTasks( tasks );
+
   var gantt_chart = new Gantt(".gantt-target", tasks, {
     on_click: function (task) {
       console.log(task);
@@ -234,8 +259,7 @@
         $( '.tasks_container .tasks_suspended ul' ).empty().append( data.tasks_suspended );
         $( '.tasks_container .tasks_to_do ul' ).empty().append( data.tasks_to_do );
         $( '.tasks_container .tasks_fvat ul' ).empty().append( data.tasks_fvat );
-        if ( data.tasks_gantt )
-          gantt_chart.refresh( data.tasks_gantt );
+        gantt_chart.refresh( normalizeGanttTasks( data.tasks_gantt ) );
       }
     });
   }
@@ -1156,10 +1180,8 @@
                 var data = jQuery.parseJSON( response );
                 if ( data.status == 'success' )
                 {
-                  var checkedVals = jQuery( 'input.g-checkbox:checked' ).map(function() {
-                    return this.value;
-                  }).get();
-                  reload_tasks( checkedVals );
+                  var selectedFilters = getSelectedTaskFilters();
+                  reload_tasks( selectedFilters.projects, selectedFilters.users );
                   close_task_popup();
                 }
               }