Isometric flat illustration. A single, freestanding, brightly colored coral-pink door, slightly ajar, sitting on an endless, featureless grey plane. A stark, low-hanging spotlight creates a severe, razor-sharp black shadow extending infinitely from the doorframe. Through the crack in the door, nothing is visible, but the shadow cast by the opening reveals a vibrant, sprawling galaxy of flat-vector stars and planets embedded strictly within the darkness. Geometric precision, bold minimalism, long shadow trend.