Ancient fantasy treehouse rising above misty cliffs

4K ultra HD, hyper-realistic cinematic mobile wallpaper, vertical 9:16 aspect ratio, photorealistic fantasy scene of an ancient, colossal treehouse perched atop a massive, gnarled living tree rising from misty cliffs. The tree’s bark is deeply textured with moss, lichen, and exposed roots wrapping around stone cottages with terracotta tiled roofs, weathered wooden shutters, and ivy creeping up walls. A winding wooden staircase spirals upward, worn by time, with tiny figures ascending. Below, two travelers in medieval cloaks stand on a rocky outcrop, gazing upward in awe. Dramatic volumetric lighting pierces through dense, billowing clouds above, casting golden rays that highlight dew-covered leaves, dust particles in the air, and subtle shadows across stone textures. Global illumination enhances depth, with soft ambient occlusion under eaves and between branches. Camera: professional cinematic wide-angle lens, f/2.8 aperture for shallow depth of field, sharp focus on the central cottage and tree trunk, background slightly blurred to emphasize scale. Atmosphere: mystical, serene yet grand, emotionally immersive with hints of adventure. Ultra-detailed surfaces — cracked plaster, rusted iron hinges, individual leaf veins, peeling paint on window frames. No text, no logos, no watermarks. Optimized for lock screen or screen saver, HDR color grading, cinematic composition balanced for smartphone display.