function submitNotify(e) {
    e.preventDefault();
    var form = document.getElementById('notify-form');
    var status = document.getElementById('notify-status');
    var email = form.querySelector('input[name="email"]').value;
    var btn = form.querySelector('button');
    btn.disabled = true;
    btn.textContent = 'Sending...';
    status.textContent = '';
    fetch('/api/email-signup', {
        method: 'POST',
        headers: {'Content-Type': 'application/json'},
        body: JSON.stringify({email: email})
    }).then(function(r) {
        if (r.ok) {
            status.textContent = 'You\'re on the list.';
            status.className = 'notify-status success';
            form.querySelector('input[name="email"]').value = '';
        } else {
            return r.json().then(function(d) { throw new Error(d.error || 'Something went wrong'); });
        }
    }).catch(function(err) {
        status.textContent = err.message;
        status.className = 'notify-status error';
    }).finally(function() {
        btn.disabled = false;
        btn.textContent = 'Notify Me';
    });
    return false;
}