/* Scroll-stacking animations using IntersectionObserver */

/* Base stacking animation classes */
.stack-on-scroll {
    position: relative;
    z-index: 1;
    transform: translateY(50px);
    opacity: 0;
    transition: transform 0.6s ease-out, opacity 0.6s ease-out;
}

.stack-on-scroll.stack-in {
    transform: translateY(0);
    opacity: 1;
    z-index: 10;
}

/* Different stacking layers for depth effect */
.stack-on-scroll.layer-1 {
    z-index: 1;
}

.stack-on-scroll.layer-2 {
    z-index: 2;
}

.stack-on-scroll.layer-3 {
    z-index: 3;
}

.stack-on-scroll.layer-4 {
    z-index: 4;
}

.stack-on-scroll.layer-5 {
    z-index: 5;
}

.stack-on-scroll.layer-6 {
    z-index: 6;
}

/* Delay classes for staggered stacking */
.stack-on-scroll.delay-1 {
    transition-delay: 0.1s;
}

.stack-on-scroll.delay-2 {
    transition-delay: 0.2s;
}

.stack-on-scroll.delay-3 {
    transition-delay: 0.3s;
}

.stack-on-scroll.delay-4 {
    transition-delay: 0.4s;
}

.stack-on-scroll.delay-5 {
    transition-delay: 0.5s;
}

.stack-on-scroll.delay-6 {
    transition-delay: 0.6s;
}

/* Ensure sections have proper stacking context */
.stack-on-scroll {
    background: inherit;
    will-change: transform;
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    .stack-on-scroll {
        transform: none;
        opacity: 1;
        transition: none;
        z-index: auto;
    }
    
    .stack-on-scroll.stack-in {
        transform: none;
        opacity: 1;
        z-index: auto;
    }
}

/* Ensure elements are visible when JavaScript is disabled */
.no-js .stack-on-scroll {
    transform: none;
    opacity: 1;
    z-index: auto;
}