Design the interior of a grand, serene mosque, with intricate Islamic architectural details like elegant arches, domes, and arabesque patterns. In the center of the scene, prominently feature the phrase 'Hayırlı Cumalar' in bold, traditional Arabic calligraphy or modern Turkish script. The text should be clearly visible, hanging as part of a decorative banner or inscribed on the wall. The lighting should be soft, casting gentle shadows on the mosque's details, creating a warm and peaceful atmosphere. Use colors like gold, white, and deep blue to enhance the spiritual ambiance