For 25 years, Google’s iconic search box was a long, slender bar where people typed in keywords like “World Cup.” But over the past three years, artificial intelligence allowed people to type in longer, more complex questions like “Who are the top 24 teams in the World Cup and what chance does the United States have of advancing?” On Tuesday, Google said the A.I. shift had inspired it to overhaul the dimensions of its search bar for the first time since 2001. The box is getting bigger and more