Generate a highly detailed 3D-rendered visual of the three different types of glial cells: astrocytes, oligodendrocytes, and microglia. The cells should have soft pinkish and purplish tones, with subtle glowing elements to indicate activity. The astrocytes should feature a branching structure, the oligodendrocytes should have compact forms with connections to neurons, and the microglia should have a dynamic, spiky appearance. Use a dark gradient background that transitions smoothly from deep black to dark shades of purple and pink, with a soft, blurred effect to create depth and contrast. Ensure the cells remain the focal point, with the background subtly enhancing the overall composition without distraction. The style should be realistic, scientific, and professional, emphasizing the unique roles of each glial cell type."