产品悬浮居中，留白至简构图

{
"image_generation_request": {
"subject": {
"placeholder": "[在此插入您的产品]",
"positioning": "居中对齐，完全置中，悬浮于空中",
"framing": "物体完全可见，无裁剪，无边缘截断，产品周围留有充足的留白"
},
"visual_style": {
"aesthetic": "超现代工业设计，超写实产品摄影，电影感科技极简主义",
"background": {
"color": "#000000",
"finish": "纯空白，哑光黑，无反光"
},
"lighting": {
"type": "自上而下的包边光，微弱主光",
"effects": [
"光谱色散",
"玻璃边缘的色差",
"棱镜状光折射",
"柔和的焦散高光"
]
}
},
"materials_and_textures": {
"primary_blends": [
"阳极氧化拉丝铝，带微圆形纹理",
"磨砂半透明聚碳酸酯，内部带橙到白的渐变光晕",
"光学级透明玻璃，带彩虹折射边缘",
"哑光喷砂金属表面"
],
"details": "高精度 CNC 加工边缘，触感滚花，平滑有机倒角"
},
"constraints": {
"mandatory_omissions": [
"不得出现灯箱",
"不得出现柔光箱",
"不得出现三脚架",
"不得出现底座",
"不得出现平台",
"不得出现道具",
"不得出现文字",
"不得出现水印",
"不得出现人手",
"不得出现地面分界线",
"不得出现背景渐变"
],
"compositional_rules": "产品必须是画面中唯一的主体。确保与任何表面完全不接触。保持绝对对称，并使背景环境达到100%黑色等级。"
},
"color_palette": {
"background": "#000000",
"accents": [
"#FF4500",
"#FFFFFF",
"#808080",
"光谱彩虹/棱镜色散"
]
}
}
}