/* this css file is what all chapters share */

[data-chapter] {
	position: relative;
}
.chapter-opening {
	position: relative;
	height: var(--opening-height, 150vh);
	@media (max-width: 480px) {
		height: 220vh;
	}
}
.chapter-opening__viewport {
	position: sticky;
	top: 0;
	width: 100%;
	height: 100vh;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	overflow: hidden;
}
.chapter-opening__rule {
	--rule-gap: var(--space-5);
	display: block;
	width: 0;
	height: 1px;
	background: linear-gradient(to right, transparent, rgb(var(--muted-color)), transparent);
	transition: width var(--duration-slow) var(--ease);
	&[data-position="top"] { margin-bottom: var(--rule-gap); }
	&[data-position="bottom"] { margin-top: var(--rule-gap); }
}
.chapter-opening.is-visible .chapter-opening__rule {
	width: clamp(80px, 18vw, 220px);
}
.chapter-opening__eyebrow,
.chapter-opening__title,
.chapter-opening__subtitle {
	opacity: 0;
	text-align: center;
	transition: opacity var(--duration-slow) var(--ease), transform var(--duration-slow) var(--ease);
}
.chapter-opening.is-visible :is(.chapter-opening__eyebrow, .chapter-opening__title, .chapter-opening__subtitle) {
	opacity: 1;
	transform: translateY(0);
}
.chapter-opening__eyebrow {
	margin-bottom: var(--space-3);
	font-size: var(--text-2xs);
	font-weight: var(--weight-regular);
	letter-spacing: var(--tracking-eyebrow);
	text-transform: uppercase;
	color: var(--opening-eyebrow-color);
}
.chapter-opening__title {
	font-family: var(--font-display);
	font-size: var(--text-4xl);
	letter-spacing: var(--tracking-wide);
	line-height: var(--leading-tight);
	color: rgb(var(--foreground-color));
}
.chapter-opening__subtitle {
	margin-top: var(--space-4);
	font-size: var(--text-base);
	letter-spacing: var(--tracking-wider);
	color: rgb(var(--foreground-color) / 0.75);
}
.chapter-content {
	position: relative;
	height: var(--content-height, 2000vh);
}
.chapter-content > .stage {
	position: sticky;
	top: 0;
	height: 100vh;
	overflow: hidden;
}
/* this allows us to animate the background tone */
@property --bg-tone {
	syntax: "<color>";
	inherits: true;
	initial-value: rgb(12 11 7);
}
.stage__bg {
	position: absolute;
	inset: 0;
	z-index: 0;
	pointer-events: none;
	background: radial-gradient(ellipse at center, color-mix(in oklab, var(--bg-tone) 20%, transparent) -10%, transparent 90%);
	transition: --bg-tone var(--duration-slower) var(--ease);
}
.stage:has(.screen.is-active[data-tone-bg="warm"])   .stage__bg { --bg-tone: rgb(var(--tone-warm-color)); }
.stage:has(.screen.is-active[data-tone-bg="floral"]) .stage__bg { --bg-tone: rgb(var(--tone-floral-color)); }
.stage:has(.screen.is-active[data-tone-bg="ash"])    .stage__bg { --bg-tone: rgb(var(--tone-ash-color)); }
.stage:has(.screen.is-active[data-tone-bg="sky"])    .stage__bg { --bg-tone: rgb(var(--tone-sky-color)); }
.stage:has(.screen.is-active[data-tone-bg="haven"])  .stage__bg { --bg-tone: rgb(var(--tone-haven-color)); }
.stage:has(.screen.is-active[data-tone-bg="dust"])   .stage__bg { --bg-tone: rgb(var(--tone-dust-color)); }
.stage:has(.screen.is-active[data-tone-bg="ember"])  .stage__bg { --bg-tone: rgb(var(--tone-ember-color)); }
.stage:has(.screen.is-active[data-tone-bg="night"])  .stage__bg { --bg-tone: rgb(var(--tone-night-color)); }
.screen {
	position: absolute;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
	gap: var(--space-2);
	padding: var(--space-4);
	text-align: center;
	opacity: 0;
	pointer-events: none;
	z-index: 1;
	transition: opacity var(--duration-base) var(--ease);
}
.screen.is-active {
	opacity: 1;
	pointer-events: auto;
	z-index: 2;
}
.screen > p {
	position: relative;
	z-index: 1;
	margin-inline: auto;
	font-size: var(--text-base);
	font-weight: var(--weight-light);
	letter-spacing: var(--tracking-tight);
	color: rgb(var(--foreground-color) / 0.75);
	opacity: 0;
	transform: translateY(20px);
	transition: opacity var(--duration-base) var(--ease), transform var(--duration-base) var(--ease);
}
.screen.is-active > p {
	opacity: 1;
	transform: translateY(0);
}
/* -- Text Emphasis -- */

.screen [data-emphasis="whisper"] {
	letter-spacing: var(--tracking-wide);
	& + [data-emphasis="whisper"] { margin-top: 0.6em; }
}
.screen [data-emphasis="beat"] {
	font-size: var(--text-xl);
	font-weight: var(--weight-regular);
	letter-spacing: var(--tracking-wide);
}
.screen [data-emphasis="reveal"] {
	margin-top: 0.6em;
	font-size: var(--text-lg);
	font-weight: var(--weight-regular);
	color: rgb(var(--foreground-color));
}
.screen [data-emphasis="final"] {
	font-size: var(--text-2xl);
	font-weight: var(--weight-light);
	letter-spacing: var(--tracking-wide);
	color: rgb(var(--foreground-color));
}