Show the Brand Name and Logo Mark centered on a large rooftop billboard above the City Setting. The billboard should be the clear focal point, viewed from a slightly elevated street-level angle with layered skyscrapers, glowing office windows and atmospheric depth behind it. Use the Color Palette across the logo and billboard surface, with strong contrast against the evening skyline. Add realistic mounting supports, subtle surface texture, natural reflections and believable urban scale. Use directional architectural lighting to illuminate the billboard without overpowering the mark. Keep the logo crisp, correctly proportioned and free of extra symbols or text. Render the scene as a realistic commercial branding mockup in the Format.
Use these details:
Brand Name: "Northline"
Logo Mark: "a minimalist geometric compass symbol paired with a clean sans-serif wordmark"
Color Palette: "white, deep navy and electric blue"
City Setting: "a dense modern downtown skyline at blue hour"
Format: "16:9 landscape billboard mockup"
AI models never repeat themselves exactly, so your result will differ from the one here. Change the details to make it yours.