“PORTABLE”是使用 FontVibe AI 创作的3D 立体粗体文字效果。厚重的方块大写字母带深度挤出，每个字母一种亮面糖果色，顶光让高光滚过圆润边角，彩色倒影落在地面上。

Square commercial key art for a compact portable wireless speaker, built around exact, legible typography. Near-black midnight-blue seamless studio background with a polished charcoal floor. At upper left, small condensed uppercase line: "NOVA MINI" in crisp white. Across the center, the dominant word "PORTABLE" in custom all-caps chunky geometric display lettering: each letter a separate hard-edged 3D object, extremely thick body, uniform extrusion depth equal to 55% of cap height, no bevels. Glossy candy-lacquer front faces with sharp specular streaks: P cherry red, O electric blue, R sunshine yellow, T lime green, A hot orange, B violet, L cyan, E magenta; every adjacent letter visibly from a different hue family. Extrusion side planes are a dark saturated version of each face color. Letters sit on one baseline and fill 82% of canvas width. Strong upper-left key light; long, crisp 45-degree cast shadows run down-right across the floor, with faint colored reflections directly beneath each letter. Centered beneath the headline, render the exact line "SOUND, UNPLUGGED." in clean white uppercase sans lettering. At the bottom, a small matte-black rounded portable speaker with perforated grille and a short cobalt fabric loop, frontal three-quarter view, placed between two fine white rules; beside it, exact details: "18 HOUR PLAYTIME • BLUETOOTH 5.4 • IP67". Ray-traced studio render, sharp focus, high contrast, clean negative space, no extra words, no misspellings, no logos beyond the specified copy.