/* Plus Jakarta Sans by Tokotype, SIL Open Font License 1.1, see fonts/OFL-PlusJakartaSans.txt.
   Preloaded in the page, and drawn only once it's in, so nothing jumps from a fallback font. */
@font-face {
	font-family: 'Plus Jakarta Sans';
	src: url('../fonts/PlusJakartaSans-Latin.woff2') format('woff2');
	font-weight: 200 800;
	font-style: normal;
	font-display: block;
}

/* Host Grotesk by Element Type, SIL Open Font License 1.1, see fonts/OFL-HostGrotesk.txt.
   For the big word on the first screen and the big texts. */
@font-face {
	font-family: 'Host Grotesk';
	src: url('../fonts/HostGrotesk-Latin.woff2') format('woff2');
	font-weight: 300 800;
	font-style: normal;
	font-display: block;
}

*,
*::after,
*::before {
	box-sizing: border-box;
}

:root {
	/* 15px at the browser default, still scales with the visitor's font size setting */
	font-size: 93.75%;
	--color-text: rgb(255 255 255 / 50%);
	--color-strong: rgb(255 255 255 / 88%);
	--color-guess: rgb(255 255 255 / 40%);
	/* one accent, for what an effect wants seen: a signal red-orange, warm against the cold silver ground */
	--color-accent: #e23e1d;
	--color-bg: #0b0b0b;
	--color-line: rgb(255 255 255 / 12%);
	--color-link: rgb(255 255 255 / 70%);
	--color-link-hover: #fff;
	/* the big word on the first screen, in the accent */
	--color-hero: var(--color-accent);
	--font: 'Plus Jakarta Sans', sans-serif;
	--font-display: 'Host Grotesk', sans-serif;
	/* page margin and column gutter, on a 15px spacing scale */
	--margin: 15px;
	--gutter: 15px;
	/* The ground, fixed to the screen: a cold silver light falling from the
	   top centre, a faint shade low on the left, and a fine grain over both */
	--bg-light: rgb(200 204 212 / 17%);
	--bg-light-soft: rgb(200 204 212 / 5%);
	--bg-shade: rgb(160 170 185 / 6%);
	--bg-layers: radial-gradient(ellipse at 50% 0%, var(--bg-light) 0%, var(--bg-light-soft) 35%, transparent 60%),
		radial-gradient(ellipse at 10% 100%, var(--bg-shade) 0%, transparent 50%);
	/* how strong the grain is: 0 for none, 1 for the tile as drawn */
	--grain-opacity: 0.3;
}

body {
	margin: 0;
	color: var(--color-text);
	background-color: var(--color-bg);
	font-family: var(--font);
	font-weight: 400;
	/* 13px */
	font-size: 0.8667rem;
	line-height: 1.4;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

/* The ground's light, fixed behind everything */
body::before {
	content: '';
	position: fixed;
	inset: 0;
	z-index: -1;
	pointer-events: none;
	background-image: var(--bg-layers);
	background-repeat: no-repeat;
}

/* The grain over the ground, a tile of random white specks */
body::after {
	content: '';
	position: fixed;
	inset: 0;
	z-index: -1;
	pointer-events: none;
	background: url(../img/grain.png) repeat;
	background-size: 384px;
	opacity: var(--grain-opacity);
}

a {
	text-decoration: none;
	color: var(--color-link);
	cursor: pointer;
}

a:hover {
	color: var(--color-link-hover);
}

a:focus-visible,
button:focus-visible {
	outline: 2px solid var(--color-link-hover);
	outline-offset: 2px;
}

/* A section or the frame, reached from a link, takes the focus without a ring */
[tabindex='-1']:focus {
	outline: none;
}

/* Read by screen readers, not shown */
.visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip-path: inset(50%);
	white-space: nowrap;
	border: 0;
}

main {
	padding: 30px var(--margin) 0;
	/* effects that reach past the column, like long shadows, never scroll the page sideways */
	overflow-x: clip;
}

/* One 12-column grid for the frame and every section, from 53em */
.frame,
.variation {
	display: grid;
	grid-template-columns: 100%;
	column-gap: var(--gutter);
}

/* Codrops frame */

.frame {
	position: relative;
	z-index: 1000;
	grid-template-areas: 'title' 'links' 'tags' 'demos';
	row-gap: 0.5rem;
	justify-items: start;
	pointer-events: none;
}

/* The Codrops ad, added to the frame on the live site after the page has
   loaded, out of the flow so nothing moves when it arrives: on phones in
   the empty space under the frame, on wider screens in the top right corner */
body #cdawrap {
	position: absolute;
	top: calc(100% + 1.5rem);
	left: 0;
	max-width: 100%;
}

.frame a {
	pointer-events: auto;
}

/* Links and buttons whose underline wipes away on hover */
.frame a,
.pager a,
.variation__replay,
.end__top {
	position: relative;
	overflow: hidden;
	white-space: nowrap;
}

.frame a::before,
.pager a::before,
.variation__replay::before,
.end__top::before {
	content: '';
	height: 1px;
	width: 100%;
	background: currentColor;
	position: absolute;
	left: 0;
	top: 92%;
	transition: transform 0.3s;
	transform-origin: 0% 50%;
}

.frame a:hover::before,
.pager a:hover::before,
.pager a[aria-current='true']::before,
.variation__replay:hover::before,
.end__top:hover::before {
	transform: scaleX(0);
	transform-origin: 100% 50%;
}

.frame__title,
.variation__title {
	grid-area: title;
	margin: 0;
	font: inherit;
	color: var(--color-strong);
}

.frame__links,
.frame__tags,
.frame__demos {
	display: flex;
	flex-wrap: wrap;
	gap: 0 1rem;
}

.frame__links {
	grid-area: links;
}

.frame__tags {
	grid-area: tags;
	gap: 0.4rem;
}

/* The tags as dark grey pills, without the underline */
.frame__tags a {
	padding: 0.2rem 0.65rem;
	border-radius: 999px;
	background: #2a2a2a;
}

.frame__tags a::before {
	content: none;
}

.frame__demos {
	grid-area: demos;
	font-variant-numeric: tabular-nums;
}

/* The variation numbers again, fixed at the top centre once the frame has
   scrolled away, on a light pane of frosted glass that blurs the text
   passing under it; the variation on screen is marked */
.pager {
	position: fixed;
	z-index: 1001;
	top: 18px;
	left: 0;
	right: 0;
	width: max-content;
	margin-inline: auto;
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 0 1rem;
	max-width: calc(100% - 2 * var(--margin));
	padding: 0.55rem 1.1rem;
	border-radius: 18px;
	/* lighter at the top, like light catching the glass, with a soft shadow under it */
	background: linear-gradient(180deg, rgb(255 255 255 / 15%), rgb(255 255 255 / 6%));
	box-shadow: 0 10px 30px rgb(0 0 0 / 35%);
	-webkit-backdrop-filter: blur(14px) saturate(140%);
	backdrop-filter: blur(14px) saturate(140%);
	font-variant-numeric: tabular-nums;
	opacity: 0;
	visibility: hidden;
	transform: translateY(-0.6rem);
	transition:
		opacity 0.3s ease,
		transform 0.5s cubic-bezier(0.33, 1, 0.68, 1),
		visibility 0s 0.5s;
}

.pager.is-visible {
	opacity: 1;
	visibility: visible;
	transform: none;
	transition:
		opacity 0.3s ease,
		transform 0.5s cubic-bezier(0.33, 1, 0.68, 1),
		visibility 0s;
}

.pager a[aria-current='true'] {
	color: var(--color-link-hover);
}

/* The first screen: the hero word, and how the page works */

.intro {
	min-height: 80svh;
	display: flex;
	flex-direction: column;
	justify-content: flex-end;
	gap: 30px;
	padding-bottom: 60px;
}

.intro__hint {
	margin: 0;
}

/* One big word whose letters slide up into view; its size is set by the
   script to fill the width, and it shows only once it has been sized */
.hero {
	font-family: var(--font-display);
	font-size: 36vw;
	font-weight: 300;
	line-height: 0.8;
	letter-spacing: -0.04em;
	white-space: nowrap;
	color: var(--color-hero);
	opacity: 0;
}

.hero.is-fitted {
	opacity: 1;
}

/* The mask the letters rise through, with room above for the ascenders */
.hero__word {
	display: inline-flex;
	align-items: baseline;
	overflow: clip;
	padding-top: 0.12em;
	margin-top: -0.12em;
}

.hero__letter {
	display: inline-block;
	will-change: transform;
}

/* Both endings of the word in one place */
.hero__ending {
	display: inline-grid;
}

.hero__ending > span {
	grid-area: 1 / 1;
	display: inline-flex;
	align-items: baseline;
}

/* Measures each word at 100px, unseen */
.hero__probe {
	position: absolute;
	visibility: hidden;
	font-size: 100px;
	white-space: nowrap;
}

/* A variation: a heading row, then the text it animates */

.variation {
	min-height: 100svh;
	align-content: start;
	row-gap: 120px;
	padding: 15px 0 180px;
	border-top: 1px solid var(--color-line);
}

/* The last variation is only as tall as it needs to be, so the page ends with it */
.variation:last-of-type {
	min-height: 0;
}

.variation__head {
	display: grid;
	grid-template-columns: auto 1fr;
	grid-template-areas: 'num replay' 'title title' 'credit credit';
	column-gap: var(--gutter);
	align-items: baseline;
}

.variation__num {
	grid-area: num;
	font-variant-numeric: tabular-nums;
}

.variation__credit {
	grid-area: credit;
	margin: 0;
}

.variation__replay {
	grid-area: replay;
	justify-self: end;
	padding: 0;
	border: 0;
	background: none;
	font: inherit;
	color: var(--color-link);
	cursor: pointer;
}

.variation__replay:hover {
	color: var(--color-link-hover);
}

.variation__text {
	/* 15px, 20px from 53em */
	font-size: 1rem;
	line-height: 1.3;
	color: var(--color-strong);
	cursor: pointer;
}

.variation__text p {
	margin: 0;
}

/* The same effect on a short, big text, so it can be felt at another size */
.variation__text.variation__text--big {
	font-family: var(--font-display);
	font-weight: 300;
	/* 44px, up to 128px */
	font-size: clamp(2.9333rem, 8vw, 8.5333rem);
	line-height: 1;
	letter-spacing: -0.03em;
}

/* A big text of more than one line: the lines a little closer */
.variation__text.variation__text--big:has([data-line] + [data-line]) {
	line-height: 0.88;
}

/* Hidden until the script has split the lines, so no text flashes first */
.js [data-line]:not(.is-ready) {
	visibility: hidden;
}

/* Each effect's own styles are in css/variations/, scoped to its data-effect name */

/* With reduced motion the texts don't replay on a click */
@media (prefers-reduced-motion: reduce) {
	.variation__text {
		cursor: auto;
	}
}

/* End of the page */

.end {
	display: flex;
	align-items: flex-end;
	padding: 30px 0;
	border-top: 1px solid var(--color-line);
}

@media screen and (min-width: 53em) {
	:root {
		--margin: 30px;
		--gutter: 30px;
	}
	.frame,
	.variation {
		grid-template-columns: repeat(12, minmax(0, 1fr));
	}
	/* title, links and tags down the left, the variations in the centre, the ad on the right */
	.frame {
		grid-template-areas:
			'title title title demos demos demos demos demos demos . . .'
			'links links links demos demos demos demos demos demos . . .'
			'tags tags tags demos demos demos demos demos demos . . .';
		align-items: start;
	}
	.frame__demos {
		justify-self: center;
		justify-content: center;
	}
	body #cdawrap {
		top: 0;
		right: 0;
		left: auto;
		max-width: calc(25% - var(--gutter));
		text-align: right;
	}
	.variation__head {
		grid-column: 1 / -1;
		grid-template-columns: subgrid;
		grid-template-areas: none;
	}
	.variation__num {
		grid-column: 1;
	}
	.variation__title {
		grid-column: 2 / 5;
	}
	.variation__credit {
		grid-column: 5 / 10;
	}
	.variation__replay {
		grid-column: 12;
	}
	/* the small text and the big one start together, under the title */
	.variation__text {
		grid-column: 2 / 12;
		font-size: 1.3333rem;
	}
	.variation__text.variation__text--big {
		grid-column: 2 / -1;
	}
}