App icon for a calm mobile merge-puzzle game called Yumo. Square 1:1, 1024x1024, full-bleed, no text, no letters, no border, no frame, no rounded-corner mask baked in.

Background: smooth vertical gradient from deep navy #151828 at the top to dark plum #2B1F3D at the bottom, with a very soft, subtle glow behind the orbs.

Subject: three glossy glowing orbs falling straight down, frozen mid-fall, arranged in a gentle diagonal stagger from upper-left to lower-right, all within the central 70% of the canvas so nothing touches the edges:
1. Small orb, upper-left: coral red-orange body #E47B58, lighter top #EDBCAB.
2. Medium orb, center: warm yellow body #E4CA58, lighter top #EDE1AB.
3. Large orb, lower-right and slightly overlapping the medium one: mint green body #58E4A0, lighter top #ABEDCD. This is the hero orb.
Each orb is a perfect circle with a soft top-left glossy highlight, a subtle darker rim, and a soft outer glow in its own color. Flat-shaded modern 2.5D game style, clean vector-like edges, not photorealistic, not 3D-rendered plastic.

Dot markings (must be exact): each orb has small solid round dots evenly spaced on an invisible ring at about 42% of the orb's radius from its center, the first dot at the 12 o'clock position, each dot about 7% of the orb's radius, colored in a darker shade of that orb:
- red-orange orb: exactly 2 dots (one at top, one at bottom), dot color #C84419
- yellow orb: exactly 3 dots forming an upward-pointing triangle, dot color #C8A819
- mint orb: exactly 6 dots forming a hexagon with one dot at top and one at bottom, dot color #19C873
No dot in the center of any orb.

Motion: behind each orb (above it, since they fall downward) soft wind/motion streaks — 3 to 5 thin tapered speed lines per orb that fade to transparent, tinted with the orb's color at low opacity, plus a faint airy trail. Streaks are vertical, parallel to the fall direction. Energetic but calm, not explosive.

Style: minimal, bold, highly legible at 48x48 pixels, strong silhouette, high contrast against the dark background, premium casual-game app icon.