// Captcha detection via MutationObserver
    // Watches document.body for #hcaptcha_window being added/removed.
    // Confirmed selector from live DOM: DIV#hcaptcha_window > DIV.h-captcha
    // ----------------------------------------------------------------
    let captchaActive = false;

    function reportCaptcha(detected) {
        const player_id = uw.Game?.player_id;
        if (!player_id) return;
        fetch(`${BASE_URL}/api/captcha/alert?player_id=${player_id}`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ detected })
        }).catch(e => log(`captcha report failed: ${e}`));
    }

    function detectCaptcha() {
        setInterval(() => {
            const win = document.getElementById('hcaptcha_window');
            let isVisible = false;

            if (win) {
                // Check if it's actually visible on screen (not display: none by the game)
                const style = window.getComputedStyle(win);
                if (style.display !== 'none' && style.visibility !== 'hidden') {
                    isVisible = true;
                }
            }

            if (isVisible && !captchaActive) {
                captchaActive = true;
                paused = true;
                const label = document.getElementById('grc_label');
                const btn = document.getElementById('grc_btn');
                if (label) label.textContent = '⚠ CAPTCHA';
                if (btn) btn.style.filter = 'brightness(70%) sepia(100%) hue-rotate(300deg) saturate(1000%) contrast(0.8)';
                log('⚠ CAPTCHA detected — bot paused, alerting server');
                reportCaptcha(true);
            } else if (!isVisible && captchaActive) {
                captchaActive = false;
                // Don't auto-resume — let the user click the button manually
                log('✅ Captcha resolved — alert cleared (bot remains paused)');
                reportCaptcha(false);
            }
        }, 1000);
    }

    // ----------------------------------------------------------------