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document.addEventListener("DOMContentLoaded", function () {
if (typeof gsap === 'undefined' || typeof ScrollTrigger === 'undefined') {
console.error('GSAP or ScrollTrigger is not loaded');
return;
}
gsap.registerPlugin(ScrollTrigger);
const cards = gsap.utils.toArray(".stack-card");
if (cards.length === 0) return;
const lastCard = cards[cards.length - 1];
const stackWrapper = document.querySelector(".stack-wrapper");
const nextSection = stackWrapper?.nextElementSibling;
// Animation settings
const scrollDistancePerCard = 400; // Scroll distance for each card animation
const cardScale = 0.94; // Scale for cards that move up
const cardMoveY = -120; // How much cards move up
// Get the tallest card height to ensure full visibility
let maxCardHeight = 0;
cards.forEach(card => {
const cardH = Math.max(card.scrollHeight, card.offsetHeight, card.clientHeight);
if (cardH > maxCardHeight) maxCardHeight = cardH;
});
// Calculate total wrapper height needed for all sequential animations
const totalScrollDistance = cards.length * scrollDistancePerCard;
// Set wrapper height to accommodate all sequential scroll animations
if (stackWrapper) {
const wrapperHeight = totalScrollDistance + maxCardHeight + 300;
stackWrapper.style.height = wrapperHeight + "px";
stackWrapper.style.minHeight = wrapperHeight + "px";
}
// Track cumulative scroll offset for sequential animation
let cumulativeOffset = 0;
cards.forEach((card, i) => {
const isLastCard = i === cards.length - 1;
// Calculate start and end points for sequential animation
// Each card starts after the previous one finishes
const cardStartOffset = cumulativeOffset;
const cardEndOffset = cumulativeOffset + scrollDistancePerCard;
// Update cumulative offset for next card
cumulativeOffset += scrollDistancePerCard;
gsap.to(card, {
y: cardMoveY,
scale: isLastCard ? 1 : cardScale,
scrollTrigger: {
trigger: stackWrapper,
start: `top+=${cardStartOffset} top+=120`,
end: `top+=${cardEndOffset} top+=120`,
scrub: true,
onLeave: () => {
if (isLastCard && stackWrapper) {
// Release the last card first
card.classList.add("released");
stackWrapper.classList.add("collapsed");
// Remove spacing
card.style.marginBottom = "0";
card.style.paddingBottom = "0";
stackWrapper.style.marginBottom = "0";
stackWrapper.style.paddingBottom = "0";
// Ensure card overflow is visible
card.style.overflow = "visible";
card.style.maxHeight = "none";
// Use double requestAnimationFrame to ensure DOM is fully updated
requestAnimationFrame(() => {
requestAnimationFrame(() => {
// Get the card's full height - use scrollHeight for complete content
const cardFullHeight = Math.max(
card.scrollHeight,
card.offsetHeight,
card.clientHeight
);
// Get wrapper's current top position
const wrapperRect = stackWrapper.getBoundingClientRect();
const wrapperTop = wrapperRect.top + window.scrollY;
// Get card's current position relative to wrapper
const cardRect = card.getBoundingClientRect();
const cardTop = cardRect.top + window.scrollY;
const cardOffsetFromWrapper = Math.max(0, cardTop - wrapperTop);
// Calculate wrapper height: card offset + full card height + generous buffer
const wrapperHeight = cardOffsetFromWrapper + cardFullHeight + 100;
stackWrapper.style.height = wrapperHeight + "px";
stackWrapper.style.minHeight = wrapperHeight + "px";
stackWrapper.style.maxHeight = "none";
// Force a reflow to ensure height is applied
stackWrapper.offsetHeight;
});
});
// Ensure next section starts right after with no gap
if (nextSection) {
nextSection.style.marginTop = "0";
nextSection.style.paddingTop = "0";
nextSection.style.position = "relative";
nextSection.style.zIndex = "10";
}
}
},
onEnterBack: () => {
if (isLastCard && stackWrapper) {
// Restore sticky behavior
card.classList.remove("released");
stackWrapper.classList.remove("collapsed");
// Restore wrapper height
let maxCardHeight = 0;
cards.forEach(c => {
const cardH = Math.max(c.scrollHeight, c.offsetHeight, c.clientHeight);
if (cardH > maxCardHeight) maxCardHeight = cardH;
});
const totalScroll = cards.length * scrollDistancePerCard;
const wrapperHeight = totalScroll + maxCardHeight + 300;
stackWrapper.style.height = wrapperHeight + "px";
stackWrapper.style.minHeight = wrapperHeight + "px";
}
}
}
});
});
});
