下沉的竞技场：保留旧立面的体育场改造

Design a stadium reconstruction in the manner of Vittorio Gregotti that keeps only the original neoclassical outer shell and excavates the playing field eleven metres below the old ground level, inserting entirely new tiers inside the historic wall. Compose the weathered stone facade standing as a screen with the modern stand visible above it, a broad hard-paved esplanade in front, the sunken bowl glimpsed through an arched opening, a hillside city beyond, bright Catalan light, low frontal view, 24mm lens, architectural photography, ultra photorealistic, 8K