App 安裝廣告 Banner（3D 漸層手機模型）

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Create a horizontal app-install banner for {app_name}, a {app_category} app. Composition: a floating smartphone mockup in the right third, tilted 15 degrees with a soft drop shadow, its screen showing a clean abstract UI in {brand_color} tones — simple blocks and cards, no readable text. Fill the left two-thirds with a smooth {brand_color}-to-dark gradient, with subtle 3D geometric shapes and light streaks pushed toward the edges to suggest speed and ease. Float one small star-rating badge beside the phone. Modern SaaS aesthetic, crisp edges, gentle depth-of-field glow. Render in 1200x628 landscape (1.91:1) for social link ads, keeping the left half visually clear for a headline, subline and download button that will highlight {key_benefit}.