iOS 健身深色活动环界面

生成一张 1024x1280 像素、4:5 竖版无品牌手机健身应用暗色截图。近纯黑背景，三个同心活动环为深红、亮绿、浅青，环下方三张指标卡写「活动 847 千卡」「训练 38 分钟」「站立 10 小时」。顶部七个星期圆点，今日白色实心点；状态栏时间写「上午9:41」。半透明隔断下方为心率折线图，标签写「心率 60-102」；旁边青色步数柱状图。所有可见文字为简体中文；BPM 不作为可见标签；不出现英文时间、真实手机品牌、水印或乱码。

A pixel-perfect iOS 17 fitness app screen mockup rendered on a Space Black iPhone 15 Pro, displayed in a flat lay on a matte charcoal surface. The screen fills the frame with a deep near-black background (#0D0D0D). Three concentric activity rings — crimson, lime green, and pale cyan — glow with soft light diffusion at the endpoints. Below the rings, a row of three metric cards shows "Move: 847 CAL", "Exercise: 38 MIN", and "Stand: 10 HRS" in SF Pro Rounded font, white numerals on dark gray pill shapes. A horizontal scroll of seven day-of-week circles appears at the top; today's dot is filled white. Subtle frosted-glass section dividers separate a heart-rate sparkline (60–102 BPM, neon red line) from a step count bar chart in teal. Status bar reads 9:41 AM. No device chrome visible — purely the live screen. Mood: calm, focused, premium wearable aesthetic. Color palette: near-black ground, neon ring accents, low-saturation card surfaces.