/*
 * Multicharts Universe — Featured Research cards (v0.3)
 *
 * Four 2x2 cards on desktop, stacks on tablet/mobile. Each card has a
 * gradient "media" area (placeholder until v0.4 featured images), category
 * tag, title, italic subtitle, excerpt, and read-time meta.
 */

body.mcu-theme .mcu-research {
	padding-block: var(--space-3xl);
	background:
		radial-gradient(ellipse at 80% 100%, rgba(139, 105, 20, 0.06) 0%, transparent 60%),
		linear-gradient(180deg, var(--color-deep-space) 0%, var(--color-cosmic-night) 100%);
}

body.mcu-theme .mcu-research__grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-lg);
	list-style: none;
	padding: 0;
	margin: 0 0 var(--space-2xl);
}

@media (min-width: 720px) {
	body.mcu-theme .mcu-research__grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

body.mcu-theme .mcu-research__item { margin: 0; padding: 0; list-style: none; }

body.mcu-theme .mcu-research__card {
	display: grid;
	grid-template-columns: 1fr;
	height: 100%;
	background: var(--color-cosmic-night);
	border: 1px solid var(--color-border-subtle);
	border-radius: var(--radius-lg);
	overflow: hidden;
	color: inherit;
	text-decoration: none;
	transition: transform var(--dur-base) var(--ease-celestial),
	            border-color var(--dur-base) var(--ease-celestial),
	            box-shadow var(--dur-base) var(--ease-celestial);
	background-size: 100% 100%;
}

@media (min-width: 600px) {
	body.mcu-theme .mcu-research__card {
		grid-template-columns: 200px 1fr;
	}
}

body.mcu-theme .mcu-research__card:hover,
body.mcu-theme .mcu-research__card:focus-visible {
	transform: translateY(-4px);
	border-color: var(--color-gold);
	box-shadow: var(--shadow-lg), var(--glow-gold-sm);
}

/* === Media (gradient placeholder, unique per card via index var) ======= */
body.mcu-theme .mcu-research__media {
	position: relative;
	min-height: 180px;
	background:
		radial-gradient(circle at 30% 20%, rgba(212, 175, 55, 0.25) 0%, transparent 50%),
		radial-gradient(circle at 70% 80%, rgba(139, 105, 20, 0.2) 0%, transparent 50%),
		linear-gradient(135deg, var(--color-stardust) 0%, var(--color-cosmic-night) 100%);
	overflow: hidden;
}

body.mcu-theme .mcu-research__pattern {
	position: absolute;
	inset: 0;
	background-image:
		linear-gradient(135deg, transparent 48%, var(--color-gold-glow) 49%, var(--color-gold-glow) 51%, transparent 52%),
		linear-gradient(45deg,  transparent 48%, var(--color-border-default) 49%, var(--color-border-default) 51%, transparent 52%);
	background-size: 32px 32px, 48px 48px;
	opacity: 0.4;
	transition: opacity var(--dur-base) var(--ease-celestial);
}

body.mcu-theme .mcu-research__card:hover .mcu-research__pattern {
	opacity: 0.7;
}

/* Each card gets a slightly different rotation/origin for visual variety */
body.mcu-theme .mcu-research__item:nth-child(1) .mcu-research__media { background-position: 0 0, 50% 50%, 0 0; }
body.mcu-theme .mcu-research__item:nth-child(2) .mcu-research__media { background-position: 100% 0, 0 100%, 0 0; }
body.mcu-theme .mcu-research__item:nth-child(3) .mcu-research__media { background-position: 0 100%, 100% 0, 0 0; }
body.mcu-theme .mcu-research__item:nth-child(4) .mcu-research__media { background-position: 100% 100%, 50% 50%, 0 0; }

/* === Body =============================================================== */
body.mcu-theme .mcu-research__body {
	display: flex;
	flex-direction: column;
	gap: var(--space-xs);
	padding: var(--space-lg);
}

body.mcu-theme .mcu-research__category {
	font-family: var(--font-body);
	font-size: var(--text-xs);
	font-weight: var(--weight-medium);
	letter-spacing: var(--tracking-widest);
	text-transform: uppercase;
	color: var(--color-gold);
	margin: 0;
}

body.mcu-theme .mcu-research__title {
	font-family: var(--font-display);
	font-size: var(--text-2xl);
	font-weight: var(--weight-regular);
	line-height: var(--leading-tight);
	letter-spacing: var(--tracking-tight);
	color: var(--color-text-primary);
	margin: 0;
}

body.mcu-theme .mcu-research__subtitle {
	font-family: var(--font-display);
	font-style: italic;
	font-size: var(--text-lg);
	color: var(--color-gold-bright);
	margin: 0;
	line-height: var(--leading-snug);
}

body.mcu-theme .mcu-research__excerpt {
	font-size: var(--text-sm);
	line-height: var(--leading-relaxed);
	color: var(--color-text-secondary);
	margin: var(--space-xs) 0 0;
	flex: 1 1 auto;
}

body.mcu-theme .mcu-research__meta {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin: var(--space-sm) 0 0;
	padding-top: var(--space-sm);
	border-top: 1px solid var(--color-border-subtle);
}

body.mcu-theme .mcu-research__read {
	font-family: var(--font-mono);
	font-size: var(--text-xs);
	color: var(--color-text-muted);
	letter-spacing: var(--tracking-wide);
}

body.mcu-theme .mcu-research__cta {
	font-family: var(--font-body);
	font-size: var(--text-sm);
	font-weight: var(--weight-medium);
	letter-spacing: var(--tracking-wide);
	text-transform: uppercase;
	color: var(--color-gold-bright);
	transition: transform var(--dur-base) var(--ease-spring);
}

body.mcu-theme .mcu-research__card:hover .mcu-research__cta {
	transform: translateX(4px);
}

body.mcu-theme .mcu-research__archive {
	text-align: center;
	margin: 0;
}