:root {
	--card-height: 40vw;
	--card-margin: 4vw;
	--card-top-offset: 1em;
	--numcards: 4;
	--outline-width: 0px;
}

#cards {
	padding-bottom: calc(var(--numcards) * var(--card-top-offset)); /* Make place at bottom, as items will slide to that position*/
	margin-bottom: var(--card-margin); /* Don't include the --card-margin in padding, as that will affect the scroll-timeline*/
}

#card_1 {
	--index: 1;
}

#card_2 {
	--index: 2;
}

#card_3 {
	--index: 3;
}

#card_4 {
	--index: 4;
}

#card_5 {
	--index: 5;
}

.card {
	position: sticky;
	top: 0;
	/*padding-top: calc(var(--index) * var(--card-top-offset)); */
}

@supports (animation-timeline: works) {

	@scroll-timeline cards-element-scrolls-in-body {
		source: selector(body);
		scroll-offsets:
			/* Start when the start edge touches the top of the scrollport */
			selector(#cards) start 1,
			/* End when the start edge touches the start of the scrollport */
			selector(#cards) start 0
		;
		start: selector(#cards) start 1; /* Start when the start edge touches the top of the scrollport */
		end: selector(#cards) start 0; /* End when the start edge touches the start of the scrollport */
		time-range: 4s;
	}

	.card {
		--index0: calc(var(--index) - 1); /* 0-based index */
		--reverse-index: calc(var(--numcards) - var(--index0)); /* reverse index */
		--reverse-index0: calc(var(--reverse-index) - 1); /* 0-based reverse index */
	}
	
	.card__content {
		transform-origin: 50% 0%;
		will-change: transform;

		--duration: calc(var(--reverse-index0) * 1s);
		--delay: calc(var(--index0) * 1s);

		animation: var(--duration) linear scale var(--delay) forwards;
		animation-timeline: cards-element-scrolls-in-body;
	}

	@keyframes scale {
		to {
			transform:
				scale(calc(
					1.1
					-
					calc(0.1 * var(--reverse-index))
				));
		}
	}
}



/** PAGE STYLING **/

* { /* Poor Man's Reset */
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}


#cards {
	list-style: none;
	outline: calc(var(--outline-width) * 10) solid blue;
	
	display: grid;
	grid-template-columns: 1fr;
	grid-template-rows: repeat(var(--numcards), var(--card-height));
	/* gap: var(--card-margin); */
}

.card {
	outline: var(--outline-width) solid hotpink;
}

.card__content {
    box-shadow: 0 0.2em 1em rgba(0, 0, 0, 0.1), 0 1em 2em rgba(0, 0, 0, 0.1);
    background: #ffffff;
    color: #ffffff; /* Changed text color to white for better readability over images */
    border-radius: 1em;
    overflow: hidden;

    /* Single grid cell where child elements stack on top of each other */
    display: grid;
    grid-template-areas: "card-layer";
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;

    align-items: center;
    justify-items: center;
    outline: var(--outline-width, 2px) solid lime;
    position: relative;
    /* min-height: 300px; /* Optional min-height to ensure space for background */ 
}

.card__content > figure {
    grid-area: card-layer;
    width: 100%;
    height: 100%;
    margin: 0;
    z-index: 1; /* Sits behind text */
}

.card__content > figure > img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card__content > div {
    grid-area: card-layer;
    z-index: 2; /* Layered on top of the image */
    width: 80%;
    text-align: center;

    display: grid;
    gap: 1em;
    
    /* Optional backdrop to make text readable */
    padding: 1.5em;
    background: rgba(0, 0, 0, 0.5); 
    border-radius: 0.5em;
}