/**
 * Research block (section_research).
 *
 * Mobile-first: the feature post is a normal cover card. From 768px it becomes a
 * split card — plain content on the left, its image on the right, one shared
 * hover (border highlight + image zoom), since it is one post.
 */

.research__head {
	display: flex;
	align-items: center;
	gap: 12px;
	margin-bottom: 24px;
}

.research__mark {
	display: block;
	width: auto;
	height: 16px;
}

.research__title {
	margin: 0;
	font-size: var(--font-size-h2);
	font-weight: var(--font-weight-bold);
	line-height: 1;
}

/* ---------- Feature post (mobile cover by default) ---------- */

.research-feature {
	position: relative;
	display: flex;
	min-height: 400px;
	border-radius: var(--radius-md);
	overflow: hidden;
	color: var(--color-white);
}

.research-feature__link {
	position: absolute;
	inset: 0;
	z-index: 3;
}

.research-feature__media {
	position: absolute;
	inset: 0;
	z-index: 0;
	overflow: hidden;
	background: var(--color-gray-border);
}

.research-feature__image {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.45s ease;
}

.research-feature:hover .research-feature__image,
.research-feature:focus-within .research-feature__image {
	transform: scale(1.05);
}

.research-feature__overlay {
	position: absolute;
	inset: 0;
	background: linear-gradient(0deg, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0) 100%);
	pointer-events: none;
}

.research-feature__content {
	position: relative;
	z-index: 2;
	display: flex;
	flex: 1;
	flex-direction: column;
	padding: 15px;
}

.research-feature__title {
	margin: auto 0 0;
	font-size: 20px;
	font-weight: var(--font-weight-bold);
	line-height: 1.2;
}

.research-feature__meta {
	display: flex;
	flex-wrap: wrap;
	gap: 8px 16px;
	margin-top: 10px;
	font-size: 15px;
	font-weight: var(--font-weight-regular);
	line-height: 1;
	color: var(--color-gray-text);
}

.research-feature__author::after {
	content: "·";
	margin-left: 16px;
}

/* ---------- Bottom cards ---------- */

.research__grid {
	display: grid;
	gap: 15px;
	margin-top: 15px;
}

.research__grid .post-card {
	min-height: 400px;
}

/* ---------- Desktop split ---------- */

@media (min-width: 768px) {
	.research-feature {
		display: grid;
		grid-template-columns: 455fr 670fr;
		gap: 15px;
		min-height: 325px;
		overflow: visible;
		color: var(--color-black);
	}

	.research-feature__content {
		order: 1;
		padding: 30px;
		background: var(--color-white);
		border: 3px solid var(--color-gray-border);
		border-radius: var(--radius-md);
		transition: border-color var(--transition-hover);
	}

	.research-feature--hub:hover .research-feature__content,
	.research-feature--hub:focus-within .research-feature__content {
		border-color: var(--color-hub);
	}

	.research-feature--accent:hover .research-feature__content,
	.research-feature--accent:focus-within .research-feature__content {
		border-color: var(--color-pink);
	}

	.research-feature__title {
		margin: 30px 0 10px;
		font-size: 30px;
	}

	.research__grid .post-card__title {
		font-size: 30px;
	}

	.research-feature__meta {
		margin-top: auto;
	}

	.research-feature__media {
		position: relative;
		inset: auto;
		order: 2;
		min-height: 325px;
		border-radius: var(--radius-md);
	}

	.research-feature__overlay {
		display: none;
	}

	.research__mark {
		height: 22px;
	}

	.research__grid {
		grid-template-columns: 670fr 465fr;
	}

	.research__grid .post-card {
		min-height: 325px;
	}
}

@media (prefers-reduced-motion: reduce) {
	.research-feature__image {
		transition: none;
	}
}