// ─── SCROLL REVEAL ───
        const revealObserver = new IntersectionObserver((entries) => {
            entries.forEach(entry => {
                if (entry.isIntersecting) {
                    entry.target.classList.add('revealed');
                    revealObserver.unobserve(entry.target);
                }
            });
        }, { threshold: 0.1 });
        document.querySelectorAll('.reveal').forEach(el => revealObserver.observe(el));

        // ─── 3D BOOK COVER TILT ───
        document.querySelectorAll('.book-cover-img').forEach(card => {
            card.addEventListener('mousemove', e => {
                const r  = card.getBoundingClientRect();
                const cx = r.width  / 2;
                const cy = r.height / 2;
                const rx = ((e.clientY - r.top  - cy) / cy) * -6;
                const ry = ((e.clientX - r.left - cx) / cx) *  6;
                card.style.transition = 'none';
                card.style.transform  = `perspective(900px) rotateX(${rx}deg) rotateY(${ry}deg) scale(1.02)`;
            });
            card.addEventListener('mouseleave', () => {
                card.style.transition = 'transform 0.5s ease';
                card.style.transform  = 'perspective(900px) rotateX(0) rotateY(0) scale(1)';
            });
        });

        // ─── NEWSLETTER ───
        document.getElementById('newsletter-form').addEventListener('submit', function(e) {
            if (this.action.endsWith('#')) {
                e.preventDefault();
                this.style.display = 'none';
                document.getElementById('newsletter-success').style.display = 'block';
            }
        });
    </script>

</body>
</html>