/* Diana Kledingreparatie - Scroll reveal animations (shared)
 * ----------------------------------------------------------
 * Paired with js/reveal.js. Elements marked [data-reveal] start hidden
 * (opacity 0, translated down) and animate into place when js adds the
 * ".revealed" class as they scroll into view.
 *
 * Motion (blueprint section 3): transform + opacity only, ~0.5s,
 * easing cubic-bezier(0.25, 0.46, 0.45, 0.94) for scroll reveals.
 *
 * Accessibility: the prefers-reduced-motion block at the bottom disables
 * all transition/animation and shows content immediately. js/reveal.js
 * additionally skips the observer under reduced motion.
 */

/* Initial (pre-reveal) state */
[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition:
        opacity 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94),
        transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: opacity, transform;
}

/* Revealed state (class toggled by js/reveal.js) */
[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Keyframe equivalent for elements that prefer animation over transition */
@keyframes revealUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stagger: siblings inside a [data-reveal-group] cascade in.
 * Used when individual data-reveal-delay attributes are not set.
 * Caps at 6 to avoid long waits on large grids. */
[data-reveal-group] > [data-reveal]:nth-child(1) { transition-delay: 0ms; }
[data-reveal-group] > [data-reveal]:nth-child(2) { transition-delay: 80ms; }
[data-reveal-group] > [data-reveal]:nth-child(3) { transition-delay: 160ms; }
[data-reveal-group] > [data-reveal]:nth-child(4) { transition-delay: 240ms; }
[data-reveal-group] > [data-reveal]:nth-child(5) { transition-delay: 320ms; }
[data-reveal-group] > [data-reveal]:nth-child(6) { transition-delay: 400ms; }
[data-reveal-group] > [data-reveal]:nth-child(n+7) { transition-delay: 480ms; }

/* Reduced motion: no movement, no fade-in delay, content visible at once. */
@media (prefers-reduced-motion: reduce) {
    [data-reveal],
    [data-reveal].revealed {
        opacity: 1;
        transform: none;
        transition: none;
        will-change: auto;
    }

    [data-reveal-group] > [data-reveal] {
        transition-delay: 0ms;
    }
}