U.S. stock futures are broadly lower, with the S&P 500 falling more than 1% as investors react to mixed earnings from tech giants and rising geopolitical risk. Disappointing full-year guidance from Tesla is weighing heavily on the technology sector, with Nasdaq futures seeing a steeper decline. Adding to the risk-off sentiment are reports of escalating U.S.-Iran tensions and a related surge in crude oil prices, prompting investor caution ahead of the market open.