A modern mobile game app icon for a football quiz game.
Center: a glossy 3D soccer ball with a bright yellow question mark glowing inside it.
Background: dark gradient from deep green (#1b5e20) to black, with subtle grass texture and light particles.
Style: clean vector, minimalistic, esports aesthetic, high contrast, no text, no letters, no words.
Vibrant colors: emerald green, electric yellow, dark charcoal.
Soft glow around the ball, slight reflection on the bottom.
Square composition, centered, ready for app store.
