황금빛 나선이 빛나는 무대 위 맨발의 아이돌 소녀

9:21 vertical full-body cinematic portrait of a 20-year-old Japanese girl barefoot at center stage. Exposed abs, bare legs, shoulders, collarbones. Hands clasped before chest as golden particles rise in a spiral from her palms. Focused expression like a transformation ritual. Golden hair tied with red ribbon flowing with light. Wearing cropped white T-shirt and denim shorts, gradually shifting into transformation outfit. Background filled with heart-shaped halos and idol energy vortex — dreamy and radiant. --ar 9:21 --v 5