function login() {
    const username = document.getElementById('login-username').value;
    const password = document.getElementById('login-password').value;
    apiPost('/auth/login', { username, password })
        .then(data => {
            if (data.message === "Login successful") {
                document.getElementById('login-panel').classList.add('d-none');
                document.getElementById('main-tabs').classList.remove('d-none');
            } else {
                showResult('login-result', data);
            }
        })
        .catch(err => {
            console.error(err);
            document.getElementById('login-result').innerText = "Error connecting to server.";
        });
}