黑色星期五促销——虚构电子品牌

生成一张 1024x1280 像素、4:5 竖版中文电商电子产品限时促销横幅，品牌统一为「示例产品 数码」。纯黑背景，电黄与霓虹橙粒子爆炸特效从画面中心向外飞溅。画面主体为哑光黑色无品牌无线耳机 3/4 透视渲染，每个耳罩带脉冲 LED 光环，霓虹橙边缘光打亮。顶部叠加锯齿边缘酸黄缎带，粗体中文写「限时闪购」。耳机下方价格组合：删除线灰色旧价「￥299」，巨大亮橙色新价「￥149」。下方白色文字「仅限48小时」。底部 CTA 条为酸黄全宽色带，黑色粗体中文「立即选购」。视觉冲击力极强，高对比，为刷屏时停住拇指而设计。所有可见文字为自然简体中文和人民币价格，不出现英文品牌、英文促销词、真实电商品牌或平台标志、水印或乱码。

A 1080x1080 px Black Friday promotional banner for a fictional consumer electronics brand called NovaTech. Stark black background flooded with scattered electric yellow and neon orange sparks — a particle explosion effect emanating from center. Dominating the center: a 3/4 perspective render of a pair of sleek matte-black wireless headphones with a pulsing LED accent ring on each earcup, rim-lit in neon orange. Overlaid at the top: a jagged-edged ribbon in acid yellow reading "BLACK FRIDAY" in heavy condensed all-caps. Below headphones: the price block — old price "$299" in struck-through grey, new price "$149" in massive bright orange numbers at approximately 90pt. Underneath: "48 Hours Only" in white. Bottom CTA bar: acid yellow full-width strip reading "SHOP NOVATECH.COM" in black bold condensed all-caps. The energy is aggressive, high-contrast, unmissable — designed to stop scroll.