.fade-in-section {
    /* Starting state: invisible */
    opacity: 0;
    
    /* Transition only opacity (remove transform) */
    transition: opacity 0.2s ease-out;
    
    /* Uses CSS variable set by JS for staggered loading */
    transition-delay: var(--delay); 
}

.fade-in-section.is-visible {
    /* Final state: fully visible */
    opacity: 1;
    /* Remove transform: translateY(0); */
}