"BRB" 是 Lumi 的暂离画面，采用 Y2K 像素桌面风格。粉、淡紫、薄荷三色大像素字带同色描边和白色像素高光，放在写着 5 分钟后回来的窗口里，旁边是空的摄像头窗口、笑脸云朵和睡着的猫。

Create a complete 16:9 be-right-back streaming screen for Lumi, rendered as a crisp, polished kawaii retro-computer interface. Place a large empty rounded camera window on the left, about 45% of the canvas, with pixel-stepped corners, a lilac title bar, three tiny pixel buttons, and a slim info bar; leave the inside genuinely blank for a future camera or avatar. Put a smaller rounded text panel on the right with clear hierarchy and generous spacing. Render the exact text “BRB” as the dominant headline, “BACK IN 5 MINUTES” beneath it, and “PLEASE STAY COZY” as a small supporting line. Put “LUMI” in the camera window’s title bar. Do not add any other words or lettering. Use kawaii pixel lettering throughout: wide, chubby letterforms made only from equal square pixels on one visible grid, about 11 pixels tall for capitals, one-pixel staircase curves and diagonals, two-pixel strokes, open counters, and one-pixel spacing on a shared baseline. Give each glyph one flat pastel face—alternate baby pink, lilac, mint, and sky blue—with a single-pixel outline in a deeper shade of that hue and one or two pure-white highlight pixels at each letter’s upper left. Keep the pixel faces flat: no gradients, 3D, glow, or texture. Set the interface on a very pale cream background with a faint lilac grid-paper pattern and light paper grain. Use lilac and baby pink pixel-stepped window frames, small pixel buttons, and a few sky-blue and mint accents. Scatter small pixel hearts, four-point sparkles, stars, a puffy cloud, and ribbon bows near the outer edges; keep the camera window and all text clear. Soft even daylight, gentle highlight bloom on the interface, and soft short shadows only. Airy spacing, bright pastel contrast, clean stream-overlay graphics, sharp readable pixel edges. No dark background, no neon saturation, no photographic scene, no additional copy.