/**
 * Phase 5.9.5 — Premium subject discovery mosaic.
 * Scoped to .nds-subject-discovery--premium only.
 */

.nds-subject-discovery--premium {
	padding: 3.25rem 0 3.5rem;
	background:
		linear-gradient(180deg, #f7f5f1 0%, #faf9f7 42%, #ffffff 100%);
	border-top: 1px solid rgba(7, 19, 31, 0.04);
}

.nds-subject-discovery--premium .nds-subject-discovery__head {
	display: flex;
	align-items: flex-end;
	justify-content: space-between;
	gap: 1.5rem 2rem;
	margin-bottom: 2rem;
}

.nds-subject-discovery--premium .nds-subject-discovery__intro {
	max-width: 36rem;
}

.nds-subject-discovery--premium .nds-subject-discovery__eyebrow {
	margin: 0 0 0.45rem;
	font-size: 0.72rem;
	font-weight: 700;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--nds-market-teal, #0b5f69);
}

.nds-subject-discovery--premium .nds-subject-discovery__head h2 {
	margin: 0 0 0.5rem;
	font-family: var(--nds-font-display);
	font-size: clamp(1.7rem, 3vw, 2.35rem);
	font-weight: 600;
	letter-spacing: -0.035em;
	line-height: 1.12;
	color: var(--nds-market-ink, #07131f);
}

.nds-subject-discovery--premium .nds-subject-discovery__lede {
	margin: 0;
	max-width: 42ch;
	font-size: 1.02rem;
	line-height: 1.55;
	color: var(--nds-color-muted, #5a6570);
}

.nds-subject-discovery--premium .nds-subject-discovery__all {
	flex-shrink: 0;
	align-self: flex-end;
	font-size: 0.92rem;
	font-weight: 700;
	letter-spacing: -0.01em;
	color: var(--nds-market-teal, #0b5f69);
	text-decoration: none;
	border-bottom: 1px solid transparent;
	padding-bottom: 0.1rem;
	transition: border-color 0.25s ease, color 0.25s ease;
}

.nds-subject-discovery--premium .nds-subject-discovery__all:hover,
.nds-subject-discovery--premium .nds-subject-discovery__all:focus-visible {
	color: var(--nds-market-ink, #07131f);
	border-bottom-color: currentColor;
}

.nds-subject-discovery--premium .nds-subject-discovery__all:focus-visible {
	outline: 2px solid var(--nds-market-teal, #0b5f69);
	outline-offset: 4px;
}

/* Desktop mosaic: 4 columns — featured 2×2, two medium stacked, four small */
.nds-subject-discovery--premium .nds-subject-discovery__mosaic {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	grid-template-rows: minmax(10.5rem, 1fr) minmax(10.5rem, 1fr) auto;
	gap: 1rem;
}

.nds-subject-discovery--premium .nds-subject-dept {
	position: relative;
	display: flex;
	flex-direction: column;
	min-width: 0;
	min-height: 100%;
	overflow: hidden;
	border-radius: 0.85rem;
	background: #fff;
	text-decoration: none;
	color: inherit;
	border: 1px solid rgba(7, 19, 31, 0.08);
	box-shadow:
		0 1px 2px rgba(7, 19, 31, 0.03),
		0 10px 28px rgba(7, 19, 31, 0.06);
	transition:
		transform 0.4s var(--nds-ease, cubic-bezier(0.22, 1, 0.36, 1)),
		box-shadow 0.4s var(--nds-ease, cubic-bezier(0.22, 1, 0.36, 1)),
		border-color 0.35s ease;
}

.nds-subject-discovery--premium .nds-subject-dept--featured {
	grid-column: 1 / 3;
	grid-row: 1 / 3;
	display: block;
	min-height: 22rem;
}

.nds-subject-discovery--premium .nds-subject-dept--medium:nth-of-type(2) {
	grid-column: 3 / 5;
	grid-row: 1 / 2;
}

.nds-subject-discovery--premium .nds-subject-dept--medium:nth-of-type(3) {
	grid-column: 3 / 5;
	grid-row: 2 / 3;
}

/* Neutralize Phase 5.8 span rules so all small tiles stay 1 column */
.nds-subject-discovery--premium .nds-subject-dept--small,
.nds-subject-discovery--premium .nds-subject-dept:not(.nds-subject-dept--featured):nth-child(n + 7) {
	grid-column: span 1;
	grid-row: 3 / 4;
}

.nds-subject-discovery--premium .nds-subject-dept__media {
	display: block;
	position: relative;
	overflow: hidden;
	background: #d9e0e4;
	flex: 0 0 auto;
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__media {
	position: absolute;
	inset: 0;
	aspect-ratio: auto;
	height: 100%;
}

.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__media {
	aspect-ratio: 21 / 9;
	min-height: 5.5rem;
	flex: 1 1 auto;
}

.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__media {
	aspect-ratio: 16 / 10;
	flex: 0 0 auto;
}

.nds-subject-discovery--premium .nds-subject-dept--small {
	min-height: 0;
}

.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__body {
	flex: 1 1 auto;
	padding: 0.95rem 1rem 1.05rem;
}

.nds-subject-discovery--premium .nds-subject-dept__media::after {
	content: "";
	position: absolute;
	inset: 0;
	pointer-events: none;
	background: linear-gradient(
		180deg,
		rgba(7, 19, 31, 0.05) 0%,
		rgba(7, 19, 31, 0.18) 42%,
		rgba(7, 19, 31, 0.72) 100%
	);
	opacity: 1;
	transition: opacity 0.35s ease;
}

.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__media::after,
.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__media::after {
	background: linear-gradient(
		180deg,
		transparent 20%,
		rgba(7, 19, 31, 0.12) 55%,
		rgba(7, 19, 31, 0.35) 100%
	);
	opacity: 0.85;
}

.nds-subject-discovery--premium .nds-subject-dept__media img {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;
	object-position: center 35%;
	transform: scale(1.02);
	transition: transform 0.55s var(--nds-ease, cubic-bezier(0.22, 1, 0.36, 1));
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__media img {
	object-position: center 30%;
}

.nds-subject-discovery--premium .nds-subject-dept__accent {
	position: absolute;
	top: 0;
	left: 0;
	width: 3px;
	height: 100%;
	z-index: 2;
	background: var(--nds-market-teal, #0b5f69);
	opacity: 0.55;
	pointer-events: none;
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__accent {
	width: 4px;
	opacity: 0.85;
	background: linear-gradient(180deg, #9fd4d8 0%, #0b5f69 100%);
}

.nds-subject-discovery--premium .nds-subject-dept__body {
	display: flex;
	flex-direction: column;
	gap: 0.4rem;
	padding: 1rem 1.1rem 1.15rem;
	position: relative;
	z-index: 1;
	background: #fff;
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__body {
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	padding: 1.85rem 1.75rem 1.7rem;
	color: #fff;
	background: transparent;
}

.nds-subject-discovery--premium .nds-subject-dept--medium {
	flex-direction: column;
}

.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__body {
	padding: 0.9rem 1.15rem 1.05rem;
}

.nds-subject-discovery--premium .nds-subject-dept__name {
	font-family: var(--nds-font-display);
	font-size: clamp(1.05rem, 1.35vw, 1.22rem);
	font-weight: 600;
	letter-spacing: -0.03em;
	line-height: 1.2;
	color: var(--nds-market-ink, #07131f);
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__name {
	font-size: clamp(1.75rem, 2.8vw, 2.35rem);
	color: #fff;
	text-shadow: 0 1px 12px rgba(7, 19, 31, 0.35);
}

.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__name {
	font-size: clamp(1.12rem, 1.5vw, 1.28rem);
}

.nds-subject-discovery--premium .nds-subject-dept__desc {
	font-size: 0.9rem;
	line-height: 1.45;
	color: var(--nds-color-muted, #5a6570);
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
	overflow: hidden;
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__desc {
	color: rgba(255, 255, 255, 0.9);
	max-width: 34ch;
	font-size: 1.02rem;
	-webkit-line-clamp: 2;
	text-shadow: 0 1px 8px rgba(7, 19, 31, 0.3);
}

.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__desc {
	-webkit-line-clamp: 2;
	font-size: 0.86rem;
}

.nds-subject-discovery--premium .nds-subject-dept__meta {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 0.75rem;
	margin-top: auto;
	padding-top: 0.75rem;
	border-top: 1px solid rgba(7, 19, 31, 0.07);
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__meta {
	border-top-color: rgba(255, 255, 255, 0.22);
	padding-top: 0.95rem;
	margin-top: 0.85rem;
}

.nds-subject-discovery--premium .nds-subject-dept__count {
	font-size: 0.78rem;
	font-weight: 700;
	letter-spacing: 0.03em;
	text-transform: uppercase;
	color: var(--nds-market-teal, #0b5f69);
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__count {
	color: #b7e0e3;
	font-size: 0.82rem;
}

.nds-subject-discovery--premium .nds-subject-dept__cta {
	display: inline-flex;
	align-items: center;
	gap: 0.4rem;
	font-size: 0.88rem;
	font-weight: 750;
	letter-spacing: -0.01em;
	color: var(--nds-market-ink, #07131f);
}

.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__cta {
	color: #fff;
}

.nds-subject-discovery--premium .nds-subject-dept__arrow {
	display: inline-block;
	width: 0.55rem;
	height: 0.55rem;
	border-right: 2px solid currentColor;
	border-top: 2px solid currentColor;
	transform: rotate(45deg);
	opacity: 0.55;
	transition: transform 0.3s ease, opacity 0.3s ease;
}

@media (prefers-reduced-motion: no-preference) {
	.nds-subject-discovery--premium .nds-subject-dept:hover,
	.nds-subject-discovery--premium .nds-subject-dept:focus-visible {
		transform: translateY(-5px);
		border-color: rgba(11, 95, 105, 0.28);
		box-shadow:
			0 22px 48px rgba(7, 19, 31, 0.14),
			0 6px 16px rgba(11, 95, 105, 0.08);
	}

	.nds-subject-discovery--premium .nds-subject-dept:hover .nds-subject-dept__media img,
	.nds-subject-discovery--premium .nds-subject-dept:focus-visible .nds-subject-dept__media img {
		transform: scale(1.07);
	}

	.nds-subject-discovery--premium .nds-subject-dept:hover .nds-subject-dept__media::after,
	.nds-subject-discovery--premium .nds-subject-dept:focus-visible .nds-subject-dept__media::after {
		opacity: 0.95;
	}

	.nds-subject-discovery--premium .nds-subject-dept:hover .nds-subject-dept__arrow,
	.nds-subject-discovery--premium .nds-subject-dept:focus-visible .nds-subject-dept__arrow {
		transform: rotate(45deg) translate(2px, -2px);
		opacity: 1;
	}
}

.nds-subject-discovery--premium .nds-subject-dept:focus-visible {
	outline: 2px solid var(--nds-market-teal, #0b5f69);
	outline-offset: 3px;
}

/* Hide legacy bento if present */
.nds-subject-discovery--premium .nds-subject-discovery__bento {
	display: none !important;
}

/* Tablet: 2-column, featured spans full width */
@media (max-width: 1100px) {
	.nds-subject-discovery--premium .nds-subject-discovery__mosaic {
		grid-template-columns: repeat(2, minmax(0, 1fr));
		grid-template-rows: none;
		gap: 0.95rem;
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured,
	.nds-subject-discovery--premium .nds-subject-dept--medium:nth-of-type(2),
	.nds-subject-discovery--premium .nds-subject-dept--medium:nth-of-type(3),
	.nds-subject-discovery--premium .nds-subject-dept--small {
		grid-column: auto;
		grid-row: auto;
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured {
		grid-column: 1 / -1;
		min-height: 18rem;
	}

	.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__media {
		aspect-ratio: 16 / 9;
		min-height: 7rem;
		flex: 0 0 auto;
	}
}

/* Mobile: featured + compact horizontal cards */
@media (max-width: 760px) {
	.nds-subject-discovery--premium {
		padding: 2.35rem 0 2.25rem;
	}

	.nds-subject-discovery--premium .nds-subject-discovery__head {
		flex-direction: column;
		align-items: flex-start;
		margin-bottom: 1.35rem;
		gap: 0.85rem;
	}

	.nds-subject-discovery--premium .nds-subject-discovery__all {
		align-self: flex-start;
	}

	.nds-subject-discovery--premium .nds-subject-discovery__mosaic {
		display: flex;
		flex-direction: column;
		gap: 0.9rem;
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured {
		min-height: 0;
		display: flex;
		flex-direction: column;
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__media {
		position: relative;
		inset: auto;
		aspect-ratio: 16 / 10;
		min-height: 11rem;
		height: auto;
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__body {
		position: relative;
		padding: 1.05rem 1.1rem 1.15rem;
		color: inherit;
		background: #fff;
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__name,
	.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__cta {
		color: var(--nds-market-ink, #07131f);
		text-shadow: none;
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__desc {
		color: var(--nds-color-muted, #5a6570);
		text-shadow: none;
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__count {
		color: var(--nds-market-teal, #0b5f69);
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__meta {
		border-top-color: rgba(7, 19, 31, 0.07);
	}

	.nds-subject-discovery--premium .nds-subject-dept--featured .nds-subject-dept__media::after {
		opacity: 0.55;
		background: linear-gradient(180deg, transparent 40%, rgba(7, 19, 31, 0.25) 100%);
	}

	/* Compact horizontal rail for remaining subjects */
	.nds-subject-discovery--premium .nds-subject-dept--medium,
	.nds-subject-discovery--premium .nds-subject-dept--small {
		display: grid;
		grid-template-columns: 6.75rem minmax(0, 1fr);
		align-items: stretch;
		min-height: 5.75rem;
	}

	.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__media,
	.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__media {
		aspect-ratio: auto;
		min-height: 100%;
		height: 100%;
		flex: none;
	}

	.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__body,
	.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__body {
		padding: 0.75rem 0.85rem 0.8rem;
		justify-content: center;
		gap: 0.25rem;
	}

	.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__desc,
	.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__desc {
		-webkit-line-clamp: 1;
		font-size: 0.82rem;
	}

	.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__meta,
	.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__meta {
		padding-top: 0.45rem;
		border-top: none;
	}

	.nds-subject-discovery--premium .nds-subject-dept--medium .nds-subject-dept__cta-label,
	.nds-subject-discovery--premium .nds-subject-dept--small .nds-subject-dept__cta-label {
		position: absolute;
		width: 1px;
		height: 1px;
		padding: 0;
		margin: -1px;
		overflow: hidden;
		clip: rect(0, 0, 0, 0);
		white-space: nowrap;
		border: 0;
	}

	.nds-subject-discovery--premium .nds-subject-dept__accent {
		width: 2px;
	}
}

@media (max-width: 400px) {
	.nds-subject-discovery--premium .nds-subject-dept--medium,
	.nds-subject-discovery--premium .nds-subject-dept--small {
		grid-template-columns: 5.75rem minmax(0, 1fr);
		min-height: 5.5rem;
	}

	.nds-subject-discovery--premium .nds-subject-dept__name {
		font-size: 1rem;
	}
}

@media (prefers-reduced-motion: reduce) {
	.nds-subject-discovery--premium .nds-subject-dept,
	.nds-subject-discovery--premium .nds-subject-dept__media img,
	.nds-subject-discovery--premium .nds-subject-dept__arrow {
		transition: none;
	}
}