"NOVA"是一张万圣节直播背景图，采用暗黑插画奇幻风格，下方配有"HALLOWEEN STREAM"字样。满月、蝙蝠、山顶鬼屋和发光的南瓜灯环绕着深靛蓝色的夜空，哥特黑体标题刻在底部居中的灰色墓碑上。你可以替换墓碑上的频道名称和副标题，制作属于自己活动的直播背景。

Create a finished 16:9 Halloween Twitch stream background, a clean flat illustrated night scene with fine paper grain and gentle drifting mist. Keep a broad, completely unobstructed webcam-safe opening in the middle: roughly the central 46% of the canvas width and central 58% of its height. No text, bats, gravestones, branches, moon, fence or other objects may enter this quiet central area. Build the Halloween scene around the perimeter. At the upper left, place a huge full moon high in a deep indigo-purple sky, its cool white rim light outlining distant silhouettes. Put a crooked haunted house with a few glowing pumpkin-orange windows on the far right, and bare twisted trees and crooked graveyard fence framing both sides. Along the lower edges, arrange weathered gravestones and a few glowing jack-o’-lanterns; keep the ground-level silhouettes low and out of the webcam opening. A few small bats cross the sky near the outer edges, not through the center. Cool moonlight is the base illumination; warm pumpkin-orange light comes only from the pumpkins and house windows. Add soft mist between gravestones, restrained moon-white accents, and no gradients or effects that muddy the open center. At the very bottom center, below the webcam-safe opening, place one small, horizontal, weathered grey stone nameplate with chipped edges and subtle damp sheen. Carve the exact text “NOVA” into it in heavy gothic blackletter: broad, monumental strokes, tight spacing and pointed terminals, each letter deeply engraved with hard bevelled inner walls and sharp dark cut shadows. Cold low raking light skims the stone face so the letters read through carved depth, not colored ink; add faint moss and pale lichen in the grooves. Make the name clearly readable at stream-overlay size. Below it, set the exact smaller line “HALLOWEEN STREAM” in restrained, clearly legible uppercase lettering. Keep the nameplate visually small so it does not intrude into the webcam area. No other text, logos, borders, or interface elements.