function calcFT(){var turn=parseFloat(document.getElementById("turn").value)||1.2;var level=document.getElementById("level").value;var target=level==="beginner"?2.2:level==="intermediate"?1.8:level==="advanced"?1.4:1.1;var diff=(turn-target).toFixed(2);var rating=diff<=0?"Excellent":diff<=0.3?"Good — small improvements possible":diff<=0.7?"Average":"Below average";document.getElementById("r1").textContent=turn+"s";document.getElementById("r2").textContent=target+"s";document.getElementById("desc").innerHTML="Your flip turn: "+turn+" seconds
Target for "+level+": "+target+"s
Rating: "+rating+"
Key improvements: tight streamline, fast hip rotation, compact tuck, strong dolphin kick.";document.getElementById("results").style.display="block";}