Create a product image of a sleek, modern smartphone with a metallic, champagne-gold finish. The phone is shown from a three-quarter angle, standing upright against a dark, gradient background that transitions from deep brown to lighter shades towards the bottom, giving it a soft spotlight effect. The phone features a minimalist design with a glossy rear surface that subtly reflects light. The camera module is prominent, located in the upper left corner of the back, featuring a black, rounded rectangular housing with two large camera lenses inside. The lenses have metallic rims, and a flash module is positioned to the right of the camera housing. The side of the phone shows a thin profile, with volume buttons visible along the right edge. The overall design should emphasize the premium quality and smooth, polished feel of the phone, highlighting the reflective metallic surface and its subtle curves. The lighting should enhance the phone's elegant materials, casting a soft shadow on the surface below it