navigator.connection.addEventListener('change', function() {
    let newIP = getIP();
    if (newIP !== storedIP) {
        alert("⚠️ SIM Swap Detected! Disconnecting session...");
        window.location.href = "logout.php";
    }
});

async function getIP() {
    let res = await fetch("https://api64.ipify.org?format=json");
    let data = await res.json();
    return data.ip;
}