/**
 * Learning Tree – 6つの学び
 */

.learning-tree {
	--lt-card-size: 200px;
	--lt-bg: #FFFDF9;
	background-color: var(--lt-bg);
	background-image:
		radial-gradient(ellipse 42% 30% at 8% 24%, rgba(189, 216, 188, 0.1) 0%, transparent 70%),
		radial-gradient(ellipse 38% 28% at 92% 68%, rgba(184, 158, 215, 0.08) 0%, transparent 72%);
	padding-block: var(--space-4xl) 0;
	overflow-x: clip;
	overflow-y: visible;
}

.learning-tree__header {
	position: relative;
	text-align: center;
	margin-bottom: var(--space-xl);
}

.learning-tree__heading-en {
	display: block;
	margin: 0 auto var(--space-sm);
	text-align: center;
}

.learning-tree__deco {
	position: absolute;
	pointer-events: none;
}

.learning-tree__deco--butterflies {
	top: -8px;
	left: calc(50% - 220px);
}

.learning-tree__deco--bird {
	top: -4px;
	right: calc(50% - 210px);
}

.learning-tree__title {
	display: inline-flex;
	align-items: baseline;
	justify-content: center;
	flex-wrap: wrap;
	gap: 0.15em;
	font-size: var(--font-size-xl);
	font-weight: var(--font-weight-bold);
	color: var(--color-primary-dark);
	line-height: 1.4;
	position: relative;
}

.learning-tree__title-lead,
.learning-tree__title-main {
	display: inline;
}

.learning-tree__num {
	font-size: 2.4em;
	font-weight: var(--font-weight-bold);
	color: var(--color-primary);
	line-height: 0.9;
	margin-inline: 0.05em;
}

.learning-tree__sparkle {
	display: inline-block;
	width: 28px;
	height: 28px;
	background:
		radial-gradient(circle at 50% 50%, #5B2784 1.5px, transparent 2px),
		radial-gradient(circle at 20% 40%, #4DD0E1 1.5px, transparent 2px),
		radial-gradient(circle at 80% 35%, #FFCA28 1.5px, transparent 2px),
		radial-gradient(circle at 30% 75%, #F48FB1 1.5px, transparent 2px),
		radial-gradient(circle at 70% 80%, #81C784 1.5px, transparent 2px);
	vertical-align: middle;
	align-self: center;
}

.learning-tree__stage {
	max-width: 1100px;
	margin-inline: auto;
	padding-inline: var(--container-padding);
}

.learning-tree__canvas {
	position: relative;
	width: 100%;
	max-width: 1000px;
	margin-inline: auto;
	aspect-ratio: 1000 / 780;
}

.learning-tree__tree {
	position: absolute;
	inset: 0;
	z-index: 1;
	pointer-events: none;
}

.learning-tree__tree-image {
	position: absolute;
	left: 50%;
	bottom: 0;
	width: 118%;
	height: auto;
	max-width: none;
	transform: translateX(-50%);
	object-fit: contain;
	object-position: center bottom;
	display: block;
}

.learning-tree__cards {
	position: absolute;
	inset: 0;
	z-index: 2;
	list-style: none;
	margin: 0;
	padding: 0;
}

/* Soft organic leaf / bubble shape (not a rectangle) */
.learning-tree__card {
	position: absolute;
	width: var(--lt-card-size);
	height: var(--lt-card-size);
	z-index: 3;
}

.learning-tree__card-inner {
	width: 100%;
	height: 100%;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	text-align: center;
	padding: 1.25rem 1rem 1.15rem;
	background: #FFFEFB;
	border: 1px solid rgba(91, 46, 145, 0.1);
	/* Organic leaf-like blob (not a perfect circle / rectangle) */
	border-radius: 58% 42% 55% 45% / 48% 52% 48% 52%;
	box-shadow:
		0 8px 24px rgba(91, 39, 132, 0.1),
		0 2px 6px rgba(0, 0, 0, 0.04);
	transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.learning-tree__card-icon {
	width: 48px;
	height: 48px;
	margin-bottom: 0.4rem;
	flex-shrink: 0;
}

.learning-tree__card-title {
	font-size: 0.9375rem;
	font-weight: var(--font-weight-bold);
	color: var(--color-primary);
	line-height: 1.35;
	margin-bottom: 0.35rem;
	letter-spacing: 0.02em;
}

.learning-tree__card-body {
	font-size: 0.6875rem;
	line-height: 1.65;
	color: #444;
	letter-spacing: 0.02em;
}

.learning-tree__card-body-keep {
	white-space: nowrap;
}

/* Card positions – matching design (top 4 + bottom 2) */
.learning-tree__card--real {
	top: 8%;
	left: 6%;
}

.learning-tree__card--real .learning-tree__card-inner {
	transform: rotate(-4deg);
}

.learning-tree__card--english {
	top: 2%;
	left: 28%;
}

.learning-tree__card--english .learning-tree__card-inner {
	transform: rotate(2deg);
}

.learning-tree__card--inquiry {
	top: 2%;
	right: 28%;
	left: auto;
}

.learning-tree__card--inquiry .learning-tree__card-inner {
	transform: rotate(-2deg);
}

.learning-tree__card--tech {
	top: 8%;
	right: 6%;
	left: auto;
}

.learning-tree__card--tech .learning-tree__card-inner {
	transform: rotate(4deg);
}

.learning-tree__card--world {
	top: 38%;
	left: 18%;
	z-index: 4;
}

.learning-tree__card--world .learning-tree__card-inner {
	transform: rotate(-3deg);
}

.learning-tree__card--collab {
	top: 38%;
	right: 18%;
	left: auto;
	z-index: 4;
}

.learning-tree__card--collab .learning-tree__card-inner {
	transform: rotate(3deg);
}

.learning-tree__card:hover .learning-tree__card-inner {
	box-shadow:
		0 12px 28px rgba(91, 39, 132, 0.14),
		0 3px 8px rgba(0, 0, 0, 0.05);
}

.learning-tree__card--real:hover .learning-tree__card-inner {
	transform: rotate(-4deg) translateY(-3px) scale(1.02);
}

.learning-tree__card--english:hover .learning-tree__card-inner {
	transform: rotate(2deg) translateY(-3px) scale(1.02);
}

.learning-tree__card--inquiry:hover .learning-tree__card-inner {
	transform: rotate(-2deg) translateY(-3px) scale(1.02);
}

.learning-tree__card--tech:hover .learning-tree__card-inner {
	transform: rotate(4deg) translateY(-3px) scale(1.02);
}

.learning-tree__card--world:hover .learning-tree__card-inner {
	transform: rotate(-3deg) translateY(-3px) scale(1.02);
}

.learning-tree__card--collab:hover .learning-tree__card-inner {
	transform: rotate(3deg) translateY(-3px) scale(1.02);
}

.learning-tree__card--real .learning-tree__card-inner {
	border-radius: 52% 48% 45% 55% / 50% 45% 55% 50%;
}

.learning-tree__card--english .learning-tree__card-inner {
	border-radius: 48% 52% 55% 45% / 55% 48% 52% 45%;
}

.learning-tree__card--inquiry .learning-tree__card-inner {
	border-radius: 55% 45% 48% 52% / 45% 55% 45% 55%;
}

.learning-tree__card--tech .learning-tree__card-inner {
	border-radius: 45% 55% 52% 48% / 52% 45% 55% 48%;
}

.learning-tree__card--world .learning-tree__card-inner {
	border-radius: 50% 50% 42% 58% / 48% 52% 48% 52%;
}

.learning-tree__card--collab .learning-tree__card-inner {
	border-radius: 50% 50% 58% 42% / 52% 48% 52% 48%;
}

/* Mobile-only UI (hidden on PC) */
.learning-tree__card-index,
.learning-tree__card-divider,
.learning-tree__prev,
.learning-tree__next,
.learning-tree__mobile-ui,
.learning-tree__mobile-links {
	display: none;
}

/* Initial animation states (GSAP takes over) */
.learning-tree.is-animatable .learning-tree__tree-image,
.learning-tree.is-animatable .learning-tree__card {
	opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
	.learning-tree.is-animatable .learning-tree__tree-image,
	.learning-tree.is-animatable .learning-tree__card {
		opacity: 1;
	}
}

/* Tablet */
@media (max-width: 1024px) {
	.learning-tree {
		--lt-card-size: 190px;
	}

	.learning-tree__card-icon {
		width: 44px;
		height: 44px;
	}

	.learning-tree__card-title {
		font-size: 0.875rem;
	}

	.learning-tree__card-body {
		font-size: 0.6875rem;
		line-height: 1.6;
	}

	.learning-tree__card-inner {
		padding: 1rem 0.85rem;
	}

	.learning-tree__deco--butterflies {
		left: calc(50% - 180px);
	}

	.learning-tree__deco--bird {
		right: calc(50% - 170px);
	}
}

@media (min-width: 769px) and (max-width: 1024px) {
	.learning-tree__card--tech,
	.learning-tree__card--collab {
		width: 220px;
		height: 220px;
	}
}

/* Mobile – leaf carousel (design mock) */
@media (max-width: 768px) {
	.learning-tree {
		--lt-card-size: auto;
		padding-block: var(--space-3xl) 0;
		background-color: var(--lt-bg);
	}

	.learning-tree__header {
		margin-bottom: var(--space-lg);
	}

	.learning-tree__deco {
		display: none;
	}

	.learning-tree__title {
		position: relative;
		flex-direction: column;
		align-items: center;
		gap: 0.35rem;
		font-size: 1.05rem;
	}

	.learning-tree__title-lead {
		display: block;
		font-size: 0.875rem;
		font-weight: var(--font-weight-medium);
		color: #555;
		padding-inline: 1.75rem;
	}

	.learning-tree__title-main {
		display: flex;
		align-items: baseline;
		justify-content: center;
		gap: 0.1em;
		font-size: 1.5rem;
	}

	.learning-tree__num {
		font-size: 2.1em;
	}

	.learning-tree__sparkle {
		display: block;
		position: absolute;
		top: 0.05rem;
		bottom: auto;
		width: 22px;
		height: 22px;
	}

	.learning-tree__sparkle--left {
		left: max(0rem, calc(50% - 7.6rem));
	}

	.learning-tree__sparkle--right {
		right: max(0rem, calc(50% - 7.6rem));
	}

	.learning-tree__stage {
		padding-inline: var(--container-padding);
		max-width: none;
	}

	.learning-tree__canvas {
		position: relative;
		aspect-ratio: auto;
		min-height: 520px;
		padding-bottom: 0;
		overflow: hidden;
	}

	.learning-tree__tree {
		position: absolute;
		inset: 0;
		width: 100%;
		max-width: none;
		margin: 0;
		opacity: 1;
		z-index: 1;
		display: flex;
		align-items: flex-end;
		justify-content: center;
		pointer-events: none;
	}

	.learning-tree__tree-image {
		position: relative;
		left: auto;
		bottom: auto;
		width: min(92vw, 360px);
		height: auto;
		max-height: none;
		transform: none;
		object-fit: contain;
		object-position: center bottom;
	}

	.learning-tree__cards {
		position: relative;
		z-index: 2;
		inset: auto;
		display: flex;
		flex-direction: row;
		flex-wrap: nowrap;
		gap: 0;
		padding: 2.5rem 0 1rem;
		margin: 0;
		overflow-x: auto;
		overflow-y: hidden;
		scroll-snap-type: x mandatory;
		scroll-behavior: smooth;
		-webkit-overflow-scrolling: touch;
		scrollbar-width: none;
		touch-action: pan-x;
	}

	.learning-tree__cards::-webkit-scrollbar {
		display: none;
	}

	.learning-tree__card {
		position: relative !important;
		top: auto !important;
		left: auto !important;
		right: auto !important;
		flex: 0 0 100%;
		width: 100%;
		height: auto;
		scroll-snap-align: center;
		scroll-snap-stop: always;
		display: flex;
		justify-content: center;
		align-items: center;
		transform: none !important;
		z-index: 2;
	}

	.learning-tree__card-inner {
		width: min(76vw, 290px);
		height: min(86vw, 320px);
		aspect-ratio: auto;
		padding: 2.25rem 1.6rem 2rem;
		background: linear-gradient(165deg, #FCF9EE 0%, #F1EDD4 55%, #EAF0D2 100%);
		border: 1.5px solid rgba(167, 193, 120, 0.5);
		/* Rounder leaf shape on mobile */
		border-radius: 50%;
		box-shadow: 0 12px 30px rgba(91, 39, 132, 0.12);
		transform: none !important;
		gap: 0;
	}

	.learning-tree__card:hover .learning-tree__card-inner {
		transform: none !important;
		box-shadow: 0 10px 28px rgba(91, 39, 132, 0.12);
	}

	.learning-tree__card--real .learning-tree__card-inner,
	.learning-tree__card--english .learning-tree__card-inner,
	.learning-tree__card--inquiry .learning-tree__card-inner,
	.learning-tree__card--tech .learning-tree__card-inner,
	.learning-tree__card--world .learning-tree__card-inner,
	.learning-tree__card--collab .learning-tree__card-inner {
		border-radius: 50%;
		transform: none !important;
	}

	.learning-tree__card-index {
		display: block;
		font-size: 0.8125rem;
		font-weight: var(--font-weight-medium);
		color: #9B7BB8;
		letter-spacing: 0.06em;
		margin-bottom: 0.65rem;
	}

	.learning-tree__card-icon {
		width: 64px;
		height: 64px;
		margin-bottom: 0.65rem;
	}

	.learning-tree__card-title {
		font-size: 1.125rem;
		margin-bottom: 0.65rem;
	}

	.learning-tree__card-divider {
		display: block;
		width: 64%;
		height: 0;
		border-top: 1.5px dashed #C9B3DE;
		margin: 0 auto 0.75rem;
	}

	.learning-tree__card-body {
		font-size: 0.8125rem;
		line-height: 1.8;
		color: #555;
	}

	.learning-tree__prev,
	.learning-tree__next {
		display: none;
	}

	.learning-tree__mobile-ui {
		display: block;
		padding-inline: var(--container-padding);
		margin-top: 0.5rem;
	}

	.learning-tree__dots {
		display: flex;
		justify-content: center;
		gap: 0.55rem;
		margin-bottom: 0.85rem;
	}

	.learning-tree__dot {
		width: 10px;
		height: 10px;
		padding: 0;
		border-radius: 50%;
		border: none;
		background: #D9CFE6;
		cursor: pointer;
	}

	.learning-tree__dot.is-active {
		background: var(--color-primary);
	}

	.learning-tree__swipe-hint {
		display: flex;
		align-items: center;
		justify-content: center;
		gap: 0.4rem;
		font-size: 0.75rem;
		color: var(--color-primary);
		line-height: 1.4;
		margin: 0 0 1.25rem;
		text-align: center;
		flex-wrap: wrap;
	}

	.learning-tree__swipe-icon {
		font-size: 0.9rem;
		letter-spacing: -0.05em;
	}

	.learning-tree__mobile-links {
		display: grid;
		grid-template-columns: 1fr 1fr;
		gap: 0.75rem;
		padding-inline: var(--container-padding);
	}

	.learning-tree__mobile-link {
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
		gap: 0.45rem;
		min-height: 110px;
		padding: 1.1rem 0.75rem;
		border-radius: 20px;
		text-align: center;
		color: var(--color-primary);
		font-weight: var(--font-weight-bold);
		font-size: 0.9375rem;
	}

	.learning-tree__mobile-link--life {
		background: #EBE8F7;
	}

	.learning-tree__mobile-link--events {
		background: #F9EBF0;
	}

	.learning-tree__mobile-link-icon {
		font-size: 1.35rem;
		line-height: 1;
	}

	.learning-tree__mobile-link-arrow {
		font-size: 0.85rem;
		opacity: 0.8;
	}

	/* Disable PC entrance opacity hide fighting carousel on mobile after load */
	.learning-tree.is-animatable .learning-tree__card {
		opacity: 1;
	}
}

@media (max-width: 430px) {
	.learning-tree__canvas {
		min-height: 480px;
	}

	.learning-tree__card-inner {
		width: min(80vw, 270px);
		height: min(88vw, 300px);
		padding: 2rem 1.25rem 1.75rem;
		border-radius: 50%;
	}

	.learning-tree__card-title {
		font-size: 1.05rem;
	}

	.learning-tree__card-body {
		font-size: 0.75rem;
	}

	.learning-tree__card-icon {
		width: 56px;
		height: 56px;
	}
}