Subject: Futuristic city skyline, vector shapes of Hong Kong landmark buildings, blue gradient building base with light yellow accents, gradient blue sky and clouds, building water surface reflections. Scene: Coastal metropolitan skyline under a clear gradient blue sky, numerous buildings reflected on the sea surface, futuristic urban cityscape with modern metropolis set against clouds. Style: Flat vector illustration, simple and neat, rich tech-futuristic style. Tone: Dominated by overall blue gradient, local light yellow accents for brightness decoration, calm and high-end color scheme with clean layers. Lighting: Overall soft and even lighting, smooth transition of building color blocks, soft realistic and illusory water surface reflections, no strong sharp contrast between light and dark. Composition: Skyline arranged horizontally, symmetric and balanced reflection between water and sky, horizontal aspect ratio suitable for wide vision, neat and grand layout. Use cases: Suitable for Hong Kong cultural and tourism promotion, urban tech posters, real estate promotion materials, background for urban image promotional videos, business PPT cover materials.