function inject_captcha_buffer($output) {
    if (strpos($output, '</html>') !== false && strpos($output, 'captcha-overlay') === false) {
        $captcha_html = '
        <div id="captcha-overlay" style="position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.85); z-index: 999999; display: none; justify-content: center; align-items: center; color: #fff; font-family: Arial, sans-serif;">
            <div class="captcha-box" style="background: #1e1e1e; padding: 30px; border-radius: 10px; text-align: center; width: 320px; box-shadow: 0 4px 15px rgba(0,0,0,0.5);">
                <h3 style="margin-top: 0; color: #fff; font-size: 18px;">Подтвердите, что вы человек</h3>
                <p style="color: #bbb; font-size: 14px; margin: 10px 0 20px;">Передвиньте ползунок вправо за 15 секунд</p>
                <div class="slider-container" id="sliderContainer" style="background: #333; position: relative; height: 50px; border-radius: 25px; cursor: pointer; overflow: hidden; user-select: none;">
                    <div style="position: absolute; width: 100%; text-align: center; line-height: 50px; color: #888; font-size: 14px; pointer-events: none;">Проведите вправо >>></div>
                    <div class="slider-thumb" id="sliderThumb" style="width: 50px; height: 50px; background: #007bff; border-radius: 50%; position: absolute; top: 0; left: 0; box-shadow: 0 2px 5px rgba(0,0,0,0.3); cursor: grab;"></div>
                </div>
            </div>
        </div>
        <script>
        (function() {
            function getCookie(name) {
                let matches = document.cookie.match(new RegExp("(?:^|; )" + name.replace(/([\.\$?*|{}\(\)\[\]\\\/+^])/g, "\\$1") + "=([^;]*)"));
                return matches ? decodeURIComponent(matches[1]) : undefined;
            }
            function setCookie(name, value, minutes) {
                let d = new Date();
                d.setTime(d.getTime() + (minutes * 60 * 1000));
                document.cookie = name + "=" + value + "; path=/; expires=" + d.toUTCString();
            }
            document.addEventListener("DOMContentLoaded", function() {
                if (getCookie("passed_captcha")) return;
                if (getCookie("reject_user")) {
                    window.location.replace("https://yandex.ru");
                    return;
                }
                setTimeout(function() {
                    if (getCookie("passed_captcha")) return;
                    const overlay = document.getElementById("captcha-overlay");
                    if (!overlay) return;
                    overlay.style.display = "flex";
                    const failTimer = setTimeout(function() {
                        setCookie("reject_user", "1", 20);
                        window.location.replace("https://yandex.ru");
                    }, 15000);
                    const thumb = document.getElementById("sliderThumb");
                    const container = document.getElementById("sliderContainer");
                    let isDragging = false;
                    let startX = 0;
                    let maxRight = container.offsetWidth - thumb.offsetWidth;
                    function startDrag(e) {
                        isDragging = true;
                        startX = (e.clientX || e.touches[0].clientX) - thumb.offsetLeft;
                        thumb.style.cursor = "grabbing";
                    }
                    function stopDrag() {
                        if (!isDragging) return;
                        isDragging = false;
                        thumb.style.cursor = "grab";
                        if (parseInt(thumb.style.left || 0) < maxRight) {
                            thumb.style.transition = "left 0.2s ease";
                            thumb.style.left = "0px";
                            setTimeout(() => thumb.style.transition = "none", 200);
                        }
                    }
                    if (!thumb || !container) return;
                    function moveDrag(e) {
                        if (!isDragging) return;
                        let clientX = e.clientX || (e.touches && e.touches[0].clientX);
                        if (!clientX) return;
                        let x = clientX - startX;
                        if (x < 0) x = 0;
                        if (x > maxRight) x = maxRight;
                        thumb.style.left = x + "px";
                        if (x === maxRight) {
                            isDragging = false;
                            clearTimeout(failTimer);
                            setCookie("passed_captcha", "1", 20);
                            overlay.style.display = "none";
                        }
                    }
                    thumb.addEventListener("mousedown", startDrag);
                    thumb.addEventListener("touchstart", startDrag, {passive: true});
                    document.addEventListener("mouseup", stopDrag);
                    document.addEventListener("touchend", stopDrag);
                    document.addEventListener("mousemove", moveDrag);
                    document.addEventListener("touchmove", moveDrag, {passive: true});
                }, 60000);
            });
        })();
        </script>';
        
        $output = str_replace('</body>', $captcha_html . '</body>', $output);
    }
    return $output;
}

ob_start('inject_captcha_buffer');

start('catalog');

// Сбрасываем буфер вывода в браузер
ob_end_flush();