Gold iPhone XS displaying abstract liquid swirl screensaver design

3D rendered smartphone mock-up featuring gold-finished iPhone model with illuminated display presenting dynamic liquid marble effect. Screen shows yellow-to-red gradient swirl pattern with organic flowing motion, characteristic of fluid simulation rendering. Notch design visible at display top. Device positioned at oblique angle against black background, revealing metallic frame finish, speaker ports, and Lightning connector detail at base. Professional product visualization employing high-contrast lighting for dimensional emphasis.