<?php
if (!isset($_GET['track_id'], $_GET['challenge_no'])) {
    die('Invalid access');
}

$track_id = (int)$_GET['track_id'];
$challenge_no = (int)$_GET['challenge_no'];
?>
<!DOCTYPE html>
<html>
<head>
    <title>Challenge <?= $challenge_no ?></title>
</head>
<body>

<h2>Challenge <?= $challenge_no ?></h2>

<p><b>Question:</b> Write code to complete this task.</p>

<form method="post" action="submit.php">
    <input type="hidden" name="track_id" value="<?= $track_id ?>">
    <input type="hidden" name="challenge_no" value="<?= $challenge_no ?>">

    <input type="text" name="answer" placeholder="Your Answer" required>
    <br><br>
    <button type="submit">Submit</button>
</form>

</body>
</html>
