Subject: Silver-gray suitcase, dark blue geometric gradient background, mute universal wheels at the bottom. Scene: High-end commercial suitcase realistic product rendering scene. Style: Realistic rendering, minimalist tech style, 8K ultra-high definition image quality. Color tone: Silver-gray metallic color matched with dark blue gradient base color, low-key high-end texture. Lighting and shadow: Directional light source from oblique above, outlines the box body edge contour, enhances metallic texture and streamlined structure. Composition: Suitcase displayed in the center, fully presents the box body shape and universal wheel details, clean image with no text. Purpose: E-commerce main image for suitcases, product detail page, high-end brand promotional visual poster.