数字媒体板块12月31日涨2.82%，掌阅科技领涨，主力资金净流入4.96亿元

Group 1 - The digital media sector increased by 2.82% on December 31, with Zhangyue Technology leading the gains [1] - The Shanghai Composite Index closed at 3968.84, up 0.09%, while the Shenzhen Component Index closed at 13525.02, down 0.58% [1] - Key stocks in the digital media sector showed significant price movements, with Zhangyue Technology rising by 10.00% to a closing price of 22.12 [1] Group 2 - The digital media sector experienced a net inflow of 496 million yuan from institutional investors, while retail investors saw a net outflow of 317 million yuan [2] - Major stocks like Zhangyue Technology had a net inflow of 2.60 billion yuan from institutional investors, representing 22.56% of its trading volume [3] - Visual China and other companies faced net outflows from retail investors, indicating a mixed sentiment among different investor types [3]