function checkAnswers () {
    const q1 = document.querySelector("input[name='q1']:checked");
    const q2 = document.querySelector("input[name='q2']:checked");
    const feedbackEl = document.getElementById("feedback");
    const hidden = document.getElementById("fail_count");

    if (!q1 || !q2) {
        feedbackEl.innerText = "Please answer both questions.";
        return;
    }

    const ok = (parseInt(q1.value,10) === 120) && (parseInt(q2.value,10) === 10);

    if (ok) {
        document.getElementById("next").disabled = false;
        feedbackEl.innerText = "✅ Correct! Click Next to continue.";
    } else {
        let fails = parseInt(hidden.value) || 0;
        fails += 1;
        hidden.value = fails;

        const left = 2 - fails;
        feedbackEl.innerText = `❌ Incorrect (${fails}/2). ${left} attempt${left===1?"":"s"} left.`;

        if (fails >= 2) {
            document.querySelector("form").submit();
        }
    }
}