preloadNearby(0);
        triggers.forEach((trigger) => {
            const startIndex = Number(trigger.dataset.lightboxIndex || 0);

            trigger.style.cursor = 'pointer';
            trigger.addEventListener('click', () => open(Number.isFinite(startIndex) ? startIndex : 0));
        });
        closeBtn.addEventListener('click', close);
        prevBtn.addEventListener('click', () => navigate(-1));
        nextBtn.addEventListener('click', () => navigate(1));
        overlay.addEventListener('click', (e) => { if (e.target === overlay) close(); });

        document.addEventListener('keydown', (e) => {
            if (!overlay.classList.contains('is-open')) return;
            if (e.key === 'Escape') close();
            if (e.key === 'ArrowLeft' && images.length > 1) navigate(-1);
            if (e.key === 'ArrowRight' && images.length > 1) navigate(1);
        });

        let touchStartX = 0;
        overlay.addEventListener('touchstart', (e) => { touchStartX = e.touches[0].clientX; }, { passive: true });
        overlay.addEventListener('touchend', (e) => {
            const delta = touchStartX - e.changedTouches[0].clientX;
            if (Math.abs(delta) > 50 && images.length > 1) navigate(delta > 0 ? 1 : -1);
        });
    })();