<div class="panel panel-danger">
    <div class="panel-heading">
        <h3 class="panel-title"><?= __("Do you want to delete this topic?") ?></h3>
    </div>
    <div class="panel-body">
        <?= __("Are you sure you want to delete the topic <em>%topic%</em> including <strong>all posts and attachments</strong>?", [
            "topic" => htmlentities($topic->title),
        ]) ?>
    </div>
    <div class="panel-footer">
        <div class="text-right">
            <form action="." method="get" class="seamless-inline">
                <input type="hidden" name="_action" value="viewtopic">
                <input type="hidden" name="topic" value="<?= htmlentities($topic->id) ?>">
                <button class="btn btn-default"><?= __("Keep topic") ?></button>
            </form>
            <form action="?_action=deletetopic" method="post" class="seamless-inline">
                <input type="hidden" name="topic" value="<?= htmlentities($topic->id) ?>">
                <input type="hidden" name="confirm" value="<?= htmlentities(base64_encode(hash("sha256", "confirm" . $topic->id, true))); ?>">
                <button class="btn btn-danger"><?= __("Delete topic &amp; posts") ?></button>
            </form>
        </div>
    </div>
</div>