Ultra-photorealistic 30-second 16:9 mountain-bike action video. Same female rider, bike, clothing, trail, and daylight throughout. Show her starting on a mountain ridge, accelerating naturally downhill, navigating roots, rocks, gravel, and tight corners with realistic braking, balance, tire traction, and suspension movement. Finish as she exits the forest and stops at a scenic valley viewpoint. Cinematic tracking shots, realistic outdoor physics, natural forest ambience, bike sounds, wind, and breathing. No dialogue, CGI look, impossible jumps, teleportation, distorted anatomy, text, logos, or watermark.
