Generate a luxurious champagne celebration scene. The primary subject is an elegantly dressed individual (specify gender, e.g., 'a woman in a flowing gown' or 'a man in a sharp suit'), positioned mid-toast, holding a sparkling crystal champagne flute. They are situated within an opulent, modern penthouse apartment, characterized by expansive floor-to-ceiling windows, high-end minimalist decor, and tasteful ambient lighting. Outside the windows, a breathtaking and vibrant city skyline at night provides a stunning backdrop, with countless illuminated skyscrapers and urban lights creating a dramatic glow. The overall atmosphere should convey sophistication, joyful exclusivity, and refined success. Emphasize warm, golden light reflecting off the champagne bubbles and the distant city lights, creating a celebratory and glamorous mood.