/**
 * Section head + "univers" panels: a full-bleed row of flex-accordion
 * panels (background image, grayscale + darkened, one expands on hover
 * while its siblings shrink, revealing a description and a CTA).
 *
 * Extracted from front-page.css's own "Trois univers, une même main"
 * section — first built for the front page, reused as-is (same classes)
 * for page-a-propos.php's "Trois formes" so this interaction isn't
 * redefined a second time. Kept in one file so future pages reuse it too,
 * the same reasoning as assets/styles/components/magazine-hub.css.
 */

.section-head {
	position: relative;
	max-width: var(--maxw);
	margin: 0 auto;
	padding: 0 clamp(1.2rem, 4vw, 3rem);
}

.section-head__num {
	display: block;
	color: rgb(255 255 255 / 45%);
	font-family: var(--font-head);
	font-size: clamp(3.4rem, 9vw, 7rem);
	line-height: 1;
}

.section-head__title {
	font-family: var(--font-head);
	font-size: clamp(2.4rem, 6vw, 4.4rem);
	letter-spacing: .01em;
	line-height: .95;
	text-transform: uppercase;
}

.section-head__sub {
	margin-top: .6rem;
	color: rgb(255 255 255 / 82%);
	font-size: 1.1rem;
}

.section-head__sub em {
	color: var(--paper);
	font-style: italic;
	font-weight: 700;
}

.universe {
	position: relative;
	width: 100vw;
	margin-left: calc(50% - 50vw);
	padding: 7rem 0 0;
}

.universe__panels {
	display: flex;
	height: min(78vh, 720px);
	margin-top: 2rem;
}

.upanel {
	position: relative;
	isolation: isolate;
	display: flex;
	flex: 1;
	flex-direction: column;
	justify-content: flex-end;
	overflow: hidden;
	padding: clamp(1.6rem, 3vw, 2.6rem);
	color: #fff;
	transition: flex .6s var(--ease);
}

.upanel__bg {
	position: absolute;
	z-index: -2;
	inset: 0;
	background: var(--img) center / cover no-repeat;
	filter: grayscale(.35) brightness(.68);
	transition: transform 1.1s var(--ease), filter .6s var(--ease);
	transform: scale(1.06);
}

.upanel::after {
	position: absolute;
	z-index: -1;
	inset: 0;
	background: linear-gradient(180deg, transparent 28%, rgb(10 8 7 / 86%));
	content: "";
	transition: background .6s;
}

.upanel::before {
	position: absolute;
	z-index: 1;
	top: 0;
	left: 0;
	width: 5px;
	height: 100%;
	background: var(--c);
	content: "";
	transition: transform .6s var(--ease);
	transform: scaleY(0);
	transform-origin: bottom;
}

.upanel__num {
	position: absolute;
	top: 1.5rem;
	right: 1.7rem;
	color: var(--flash);
	font-family: var(--font-mono);
	font-size: .78rem;
	letter-spacing: .2em;
	opacity: .7;
}

.upanel__k {
	font-family: var(--font-mono);
	font-size: .7rem;
	letter-spacing: .16em;
	text-transform: uppercase;
	opacity: .88;
}

.upanel__t {
	margin: .25rem 0;
	font-family: var(--font-head);
	font-size: clamp(2.4rem, 4.4vw, 4.2rem);
	line-height: .88;
	text-transform: uppercase;
}

.upanel__d {
	max-width: 34ch;
	max-height: 0;
	overflow: hidden;
	font-family: var(--font-display);
	font-size: 1.05rem;
	line-height: 1.45;
	opacity: 0;
	transition: max-height .6s var(--ease), opacity .5s var(--ease), margin .6s;
}

.upanel__cta {
	display: inline-flex;
	align-items: center;
	gap: .5rem;
	max-height: 0;
	overflow: hidden;
	font-family: var(--font-mono);
	font-size: .76rem;
	letter-spacing: .1em;
	text-transform: uppercase;
	opacity: 0;
	transition: max-height .6s var(--ease), opacity .5s var(--ease), margin .6s;
}

.universe__panels:hover .upanel,
.universe__panels:focus-within .upanel {
	flex: .72;
}

.universe__panels .upanel:hover,
.universe__panels .upanel:focus-visible {
	flex: 2.4;
}

.upanel:hover .upanel__bg,
.upanel:focus-visible .upanel__bg {
	filter: grayscale(0) brightness(.82);
	transform: scale(1);
}

.upanel:hover::after,
.upanel:focus-visible::after {
	background: linear-gradient(180deg, transparent 8%, rgb(10 8 7 / 80%));
}

.upanel:hover::before,
.upanel:focus-visible::before {
	transform: scaleY(1);
}

.upanel:hover .upanel__d,
.upanel:focus-visible .upanel__d {
	max-height: 130px;
	margin-top: .8rem;
	opacity: 1;
}

.upanel:hover .upanel__cta,
.upanel:focus-visible .upanel__cta {
	max-height: 40px;
	margin-top: 1rem;
	opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
	.upanel,
	.upanel__bg,
	.upanel::before {
		transition-duration: .01ms;
	}
}