How did the roofs of ancient buildings in China develop?

In order to protect the frame wall around the column network, the roofs of ancient buildings in China used large eaves, but the large eaves hindered indoor lighting, and the rainwater leaked from the roof often washed away the ground near the abutment in summer rainstorm, so the eaves were created in the Han Dynasty. Then in the Jin Dynasty, the structure with upturned corners appeared, resulting in lifting and folding, which made the huge roof on the upper part of the building present a light and lively image and became one of the most remarkable features of China architecture. By the Han Dynasty, there had been five basic forms of roof, namely, a hall, a sloping hill, a Ding Dian, and a temple tip, and double-eaved roofs, while in the Southern and Northern Dynasties, they were mostly hook-shaped. Later, single slope, T-shaped ridge, cross ridge, Mengding, Peng Qi roof, helmet roof and dome appeared. Various complex shapes composed of these roofs have appeared one after another. Ancient craftsmen in China have rich experience in using roof forms to achieve artistic effects. Many excellent combined images are reflected in the paintings of Tang and Song Dynasties. For example, the roof forms of the Forbidden City and the Summer Palace in Beijing are distinct and varied, which has strengthened the artistic appeal and made great achievements.