Anime Gateway in a Mountain Cave

An anime-style gateway inside a rugged mountain cave. A glowing arch-shaped portal stands at the center, etched with glowing runes and pulsing cyan-pink energy. Through the portal you glimpse a distant twilight mountain landscape. The cave walls are rough stone with stalactites, crystals, and patches of moss; wisps of mist drift through the air. Soft volumetric light pours from the portal, casting dynamic cel-shaded shadows and vibrant gradients on the rocks. Add small sparkles and dust motes, a gentle breeze moving loose stones. Cinematic composition, slightly low-angle with the gate dominating the frame. Style: high-detail anime illustration with crisp linework, smooth shading, and painterly textures.