add_filter('the_content', function($content) {
    if (is_singular()) {
        $cta = '<div style="background:#2D4A4A;padding:24px 20px;text-align:center;margin:40px 0 20px;border-radius:8px"><h3 style="color:#fff;margin:0 0 8px;font-size:1.2em">📩 Get daily intel for Costa del Sol expats</h3><p style="color:#ccc;margin:0 0 12px;font-size:0.9em">Taxes, healthcare, bureaucracy — the stuff nobody tells you after you move. Free, daily.</p><a href="https://waypointsur.com" style="display:inline-block;background:#D4AF37;color:#1a1a1a;padding:12px 32px;border-radius:6px;text-decoration:none;font-weight:bold">Subscribe Free →</a></div>';
        $content .= $cta;
    }
    return $content;
});