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The signature control is the 3D button: a solid #58cc02 face on a hard 0 4px 0 #58a700 lip, radius 12px, 50px tall, white UPPERCASE 15/700 at +0.8px — it depresses on press (try clicking). Secondary is white with macaw text and a grey #e5e5e5 lip.
Depth is the hard 3D lip — a solid 0 Npx 0 offset shadow in a darker hue, never blurred. Motion: buttons depress onto the lip on press; playful bouncy character animations elsewhere.