:root {
    --scroll-offset: 50px;
    --scroll-duration: 0.8s;
    --scroll-easing: cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-fade-in {
    opacity: 0;
    transition: opacity var(--scroll-duration) var(--scroll-easing);
}

.scroll-fade-in.is-visible {
    opacity: 1;
}

.scroll-fade-up {
    opacity: 0;
    transform: translateY(var(--scroll-offset));
    transition: opacity var(--scroll-duration) var(--scroll-easing), 
                transform var(--scroll-duration) var(--scroll-easing);
}

.scroll-fade-up.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.scroll-fade-down {
    opacity: 0;
    transform: translateY(-var(--scroll-offset));
    transition: opacity var(--scroll-duration) var(--scroll-easing), 
                transform var(--scroll-duration) var(--scroll-easing);
}

.scroll-fade-down.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.scroll-fade-left {
    opacity: 0;
    transform: translateX(-var(--scroll-offset));
    transition: opacity var(--scroll-duration) var(--scroll-easing), 
                transform var(--scroll-duration) var(--scroll-easing);
}

.scroll-fade-left.is-visible {
    opacity: 1;
    transform: translateX(0);
}

.scroll-fade-right {
    opacity: 0;
    transform: translateX(var(--scroll-offset));
    transition: opacity var(--scroll-duration) var(--scroll-easing), 
                transform var(--scroll-duration) var(--scroll-easing);
}

.scroll-fade-right.is-visible {
    opacity: 1;
    transform: translateX(0);
}


.scroll-scale {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity var(--scroll-duration) var(--scroll-easing), 
                transform var(--scroll-duration) var(--scroll-easing);
}

.scroll-scale.is-visible {
    opacity: 1;
    transform: scale(1);
}

.scroll-stagger {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-stagger.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.scroll-delay-1 { transition-delay: 0.1s; }
.scroll-delay-2 { transition-delay: 0.2s; }
.scroll-delay-3 { transition-delay: 0.3s; }
.scroll-delay-4 { transition-delay: 0.4s; }
.scroll-delay-5 { transition-delay: 0.5s; }
.scroll-delay-6 { transition-delay: 0.6s; }

@media (prefers-reduced-motion: reduce) {
    .scroll-fade-in,
    .scroll-fade-up,
    .scroll-fade-down,
    .scroll-fade-left,
    .scroll-fade-right,
    .scroll-scale,
    .scroll-stagger {
        opacity: 1;
        transform: none;
        transition: none;
    }
}