   const body = document.body;
    body.addEventListener('mousemove', e => {
        body.style.setProperty('--x', e.clientX + 'px');
        body.style.setProperty('--y', e.clientY + 'px');
    });
    
    // --- Card Glow Effect ---
    const cards = document.querySelectorAll('.feature-card');
    cards.forEach(card => {
        card.addEventListener('mousemove', e => {
            const rect = card.getBoundingClientRect();
            const x = e.clientX - rect.left;
            const y = e.