ミニマリスト 一本の細い曲線が弧を描く光のライン壁紙

Vertical 9:16 phone wallpaper of a single thin curved line of light arcing gracefully across a vast matte charcoal field, one precise luminous stroke against deep emptiness, soft even tone, the arc low with expansive dark space above, near-black with a crisp white line, calm ultra-minimal mood, no text, no logo, no watermark, no borders.