Design an ultra-high-resolution (4K) abstract background featuring intersecting neon lines in vibrant shades of cyan, magenta, and electric blue against a deep black canvas. Use a 9:16 vertical aspect ratio to emphasize the dynamic height and depth of the geometric pattern. Each line should have a sharp, crisp clarity with subtle anti-aliasing, ensuring clean edges and smooth intersections. Apply a gentle backlit glow effect to the neon lines, allowing a soft radiance onto the black background to create depth and contrast. Use selective high contrast to make the neon colors pop while maintaining a minimalist, modern feel. The composition should highlight geometric intersections without overcrowding, offering a sleek and futuristic aesthetic. Keywords: neon geometry, minimalist abstract, high contrast, cyan, magenta, electric blue.