video game, Jagged Alliance 3, character, mercenary, inventory screen, selecting items, weapons, armor, gadgets, sell option, merchant NPC, trading post, in-game currency, transaction, barter system, detailed textures, realistic materials, user interface, clear labels, drag and drop, confirm sale button, ambient marketplace sounds, bustling town square, midday sun, dynamic shadows, 3/4 view, interactive gameplay, strategy, economic management, resource management, clear visual cues, high-resolution display.