广告营销板块12月18日涨0.31%，龙韵股份领涨，主力资金净流出1.92亿元

Group 1 - The advertising and marketing sector increased by 0.31% compared to the previous trading day, with Longyun Co., Ltd. leading the gains [1] - The Shanghai Composite Index closed at 3876.37, up by 0.16%, while the Shenzhen Component Index closed at 13053.98, down by 1.29% [1] - A detailed table of individual stock performance in the advertising and marketing sector is provided [1] Group 2 - The main funds in the advertising and marketing sector experienced a net outflow of 192 million yuan, while retail funds saw a net inflow of 87.1 million yuan [2] - The net inflow of funds from speculative investors was 105 million yuan [2] - A detailed table of fund flows for individual stocks in the advertising and marketing sector is provided [2]