/**
 * Paper Stack Scroll Effect
 * Universal section-by-section scroll animation
 *
 * @package AITSC_Pro_Theme
 * @version 1.0.1
 */

/* ============================================================
   BASE STYLES - Sections start invisible
   ============================================================ */

.paper-stack-wrapper {
    position: relative;
}

/* All sections inside wrapper start hidden */
.paper-stack-wrapper > section,
.paper-stack-section {
    opacity: 0;
    transform: translateY(var(--ps-distance, 100px));
    transition: opacity var(--ps-duration, 0.6s) var(--ps-easing, ease-out),
                transform var(--ps-duration, 0.6s) var(--ps-easing, ease-out);
    will-change: transform, opacity;
}

/* When visible, show the section */
.paper-stack-wrapper > section.is-visible,
.paper-stack-section.is-visible {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* ============================================================
   ANIMATION TRIGGER
   ============================================================ */

/* When visible, show the section with animation */
.paper-stack-wrapper > section.is-visible,
.paper-stack-section.is-visible {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

/* Mobile (0-767px) */
@media (max-width: 767px) {
    .paper-stack-wrapper > section,
    .paper-stack-section {
        --ps-distance: 50px;
        --ps-duration: 0.4s;
    }
}

/* Tablet (768-991px) */
@media (min-width: 768px) and (max-width: 991px) {
    .paper-stack-wrapper > section,
    .paper-stack-section {
        --ps-distance: 75px;
        --ps-duration: 0.5s;
    }
}

/* Desktop (992px+) */
@media (min-width: 992px) {
    .paper-stack-wrapper > section,
    .paper-stack-section {
        --ps-distance: 100px;
        --ps-duration: 0.6s;
    }
}

/* Large Desktop (1200px+) */
@media (min-width: 1200px) {
    .paper-stack-wrapper > section,
    .paper-stack-section {
        --ps-distance: 120px;
        --ps-duration: 0.7s;
    }
}

/* ============================================================
   VARIANTS
   ============================================================ */

/* Subtle */
.paper-stack-wrapper--subtle > section {
    --ps-distance: 30px;
    --ps-duration: 0.3s;
}

/* Dramatic */
.paper-stack-wrapper--dramatic > section {
    --ps-distance: 150px;
    --ps-duration: 0.8s;
}

/* Fast */
.paper-stack-wrapper--fast > section {
    --ps-duration: 0.3s;
}

/* Slow */
.paper-stack-wrapper--slow > section {
    --ps-duration: 1s;
}

/* ============================================================
   STAGGERED DELAYS
   ============================================================ */

.paper-stack-wrapper > section:nth-child(1) { --ps-delay: 0s; }
.paper-stack-wrapper > section:nth-child(2) { --ps-delay: 0.1s; }
.paper-stack-wrapper > section:nth-child(3) { --ps-delay: 0.2s; }
.paper-stack-wrapper > section:nth-child(4) { --ps-delay: 0.3s; }
.paper-stack-wrapper > section:nth-child(5) { --ps-delay: 0.4s; }
.paper-stack-wrapper > section:nth-child(n+6) { --ps-delay: 0.5s; }

/* ============================================================
   ACCESSIBILITY - REDUCED MOTION
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
    .paper-stack-wrapper > section,
    .paper-stack-section {
        --ps-distance: 0px !important;
        --ps-duration: 0.001s !important;
        animation: none !important;
        transition: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}

/* ============================================================
   DISABLED STATE
   ============================================================ */

.paper-stack-section--disabled {
    --ps-distance: 0px !important;
    --ps-duration: 0.001s !important;
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
}

/* ============================================================
   PRINT STYLES
   ============================================================ */

@media print {
    .paper-stack-wrapper > section,
    .paper-stack-section {
        --ps-distance: 0px !important;
        --ps-duration: 0.001s !important;
        animation: none !important;
        transition: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}