Create a highly detailed and vibrant mandala artwork entirely composed of interconnected and overlapping triangular patterns. The design should maintain a symmetrical and intricate structure, radiating from the center with layers of triangular shapes forming the mandala. Use a wide variety of bright, neon-like colors, including fluorescent shades of pink, orange, green, blue, yellow, and purple. The colors should resemble the effect of being hand-colored with neon markers, with subtle gradient transitions and glowing accents. Ensure the triangular shapes are precise and form complex geometric patterns. The background should be black to enhance the brightness of the neon colors and make the artwork visually striking.