CREATIVE CONCEPT A premium close-up of the smartphone as the undeniable hero, visually communicating a 30-day real-world test through subtle time-related elements and cinematic storytelling. VISUAL HOOK The smartphone dominates the frame, immediately attracting attention through scale, reflections and dramatic lighting. THUMBNAIL TEXT 30 DÍAS ART DIRECTION Dark futuristic background, cinematic lighting, strong contrast, shallow depth of field and clean composition. The phone remains sharply detailed while the background stays secondary. The typography is large, bold and highly readable on mobile. FINAL IMAGE PROMPT Create a high-impact YouTube thumbnail, 16:9, featuring the provided smartphone as the dominant hero subject in an impressive close-up. Premium futuristic environment, cinematic dramatic lighting, dark sophisticated background, subtle technological elements, realistic reflections, strong depth of field, high contrast, clean visual hierarchy, bold highly legible text “30 DÍAS”, professional technology channel aesthetic, visually striking, mobile-first composition, 1280x720. AVOID Cluttered backgrounds, tiny text, excessive visual elements, distorted smartphone proportions or generic stock-photo aesthetics.