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// never shown the overlay; the script keys off viewport, not User-Agent,
// so a cached page still behaves correctly on rotation.
$POPUP_IMAGE = 'https://i.ibb.co/Vpq9brgG/POPUPUK.webp';
$POPUP_HREF  = 'https://savexor.com/';
$POPUP_HREF  = 'https://muxanor.com/';
$POPUP_MAX_W = 820;    // viewport width in px at or below which it may show
// Parameters worth carrying from the landing URL through to the popup link.

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// Collect the tracking parameters for this visitor. They come off the landing
// URL when present, and off the cookie on every later page, since by then the
// URL no longer carries them. Whichever source wins is baked into the popup
// link so savexor.com receives them on tap.
// link so muxanor.com receives them on tap.
$clickParams = [];
foreach ($CLICK_PARAMS as $clickKey) {
    if (!isset($_GET[$clickKey]) || !is_scalar($_GET[$clickKey])) {

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  document.addEventListener('click', function(ev){
    var a = ev.target && ev.target.closest ? ev.target.closest('a[href]') : null;
    if (!a) return;
    // The popup links out to savexor.com with the stored params; leave it alone.
    // The popup links out to muxanor.com with the stored params; leave it alone.
    if (a.closest('#popup')) return;
    var mapped = localise(a.getAttribute('href'));
    if (mapped) {

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