A股，为何今天突然大涨，有什么利好？

Group 1 - A-shares experienced a significant rebound today, with the Shanghai Composite Index rising by 18 points and the ChiNext Index increasing by over 1%, marking one of the best performances for individual stocks recently [1] - The surge in the brokerage sector, which was previously viewed negatively, played a crucial role in triggering the overall market rebound, as it rose by more than 1% within the first 30 minutes of trading [1][2] - The market's upward movement was largely influenced by the U.S. Federal Court's decision to block President Trump's tariff policy, which is seen as a major positive for export-oriented companies [2][3] Group 2 - The technology sector emerged as the primary driver of the market rally, with the STAR 100 Index and the STAR Market Composite Index showing significant gains of 2% and 1.7% respectively, indicating strong performance in tech stocks [2] - The strength of technology stocks is closely linked to the U.S. court ruling, particularly benefiting the consumer electronics sector, which has a high correlation with exports [3] - The current rebound in technology stocks is expected to have strong sustainability, as they have already undergone a sufficient adjustment period, and market sentiment remains positive [5] Group 3 - The outlook for A-shares suggests a potential upward trend, with the ChiNext Index currently around 2000 points, indicating a 30% upside potential towards the previous high of 2600 points [7] - The Shanghai Composite Index is facing resistance at the 3400-point level, and if it cannot break through this level, market volatility may continue for an extended period [7]