模块化科幻能量长矛概念海报

Create a vertical **sci-fi weapon concept design poster** featuring a futuristic **Modular Energy Spear**. Use a deep **electric blue and violet background** with subtle geometric patterns. Place one oversized weapon diagonally across the composition, taking up most of the canvas. The weapon should have a sleek mechanical silhouette, dark graphite metal, silver edges, small gold details, and glowing cyan energy parts. Behind the weapon, add huge cropped decorative typography: **VANGUARD** At the top left, place a small technical label: **TACTICAL EQUIPMENT / UNIT 07** On the right side, add the main title: **ARC SPEAR** Subtitle: **Adaptive Combat Weapon** Below it, include a short English description explaining that the weapon can switch between a compact mode and an extended spear mode. At the bottom, create a small **FUNCTION DEMO** panel showing three simplified weapon states arranged horizontally: **COMPACT → DEPLOY → ENERGY MODE** Add small arrows, technical icons, and short UI labels. Style: premium anime game concept art, futuristic industrial design, clean editorial layout, sharp cel-shaded rendering, metallic material details, bold typography, blue-violet color palette, subtle technical UI graphics, high-detail weapon presentation, polished game artbook aesthetic.