Lu You's poetry creation can be divided into several historical periods. What are their style characteristics?

Lu You's poems can be roughly divided into three periods: the first period is from youth to middle age (46 years old), with the longest period but the least works, about 200, because Lu You deleted and eliminated his early works. The second period is 46-54 years old, with more than 2,400 poems. During this period, due to his in-depth military life, his poetic style became bold and magnificent. ...