Magical Halloween Event Banner

Professional Halloween event banner, horizontal 16:9, polished 3D cartoon illustration. [Colors] midnight blue-violet sky (#1E2350), glowing butter-yellow moon (#F6D98A), pumpkin orange (#F08A2E), deep forest teal (#1B3B3A). [Layout] centered composition: a full moon disc sits behind the type block, ghost and castle flank left and right, pumpkins pool along the bottom edge, all text stacked in the middle third. [Typography] rounded bubbly headline in white with subtle bevel reading "Magical Halloween, Let's Make Mischief Together", plus a small arched ribbon label reading "Trick or Treat" and a purple pill button reading "Fantasy Party, Endless Surprises". [Subject] a chibi witch girl in a pointed violet hat holding a star wand, standing among grinning jack-o'-lanterns; a friendly white ghost floats at right, another peeks at left; a purple-spired fairy-tale castle with lit windows rises at right; pine trees, bare branches and bats fill the horizon. [Lighting & Mood] soft moon glow, warm pumpkin interiors, cheerful storybook night. [Details] floating sparkles, a few candy corn, clean negative space behind the headline for marketplace cropping.