/* ARK design system — shared across index.html and ark-home.html */

:root {
	--brand: #0d9488;
	--brand-dark: #0f766e;
	--brand-light: #2dd4bf;
	--brand-ink: #ffffff;
	--ink: #0f172a;
	--muted: #52606d;
	--surface: #ffffff;
	--surface-alt: #f1f5f9;
	--border: #e2e8f0;
	--shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
	--shadow-lg: 0 20px 40px -16px rgba(15, 23, 42, 0.25);
	--radius: 18px;
	--radius-sm: 12px;
}

body {
	font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	color: var(--ink);
	background: var(--surface-alt);
	-webkit-font-smoothing: antialiased;
}

a {
	text-decoration: none;
}

/* ---------- Navbar ---------- */
.navbar-ark {
	background: rgba(255, 255, 255, 0.85);
	backdrop-filter: blur(10px);
	-webkit-backdrop-filter: blur(10px);
	border-bottom: 1px solid var(--border);
}

.navbar-ark .navbar-brand {
	display: flex;
	align-items: center;
	gap: 0.6rem;
	font-weight: 700;
	letter-spacing: -0.01em;
	color: var(--ink);
}

.navbar-ark .brand-mark {
	width: 30px;
	height: 30px;
	border-radius: 9px;
	background: linear-gradient(135deg, var(--brand-light), var(--brand-dark));
	display: inline-flex;
	align-items: center;
	justify-content: center;
	color: #fff;
	font-size: 0.85rem;
	font-weight: 800;
}

.navbar-ark .nav-link {
	color: var(--muted);
	font-weight: 500;
	font-size: 0.92rem;
}

.navbar-ark .nav-link:hover,
.navbar-ark .nav-link.active {
	color: var(--brand-dark);
}

/* ---------- Hero ---------- */
.hero {
	position: relative;
	overflow: hidden;
	background: radial-gradient(circle at 15% 20%, var(--brand-light), transparent 45%),
		radial-gradient(circle at 85% 0%, #38bdf8, transparent 40%),
		linear-gradient(160deg, var(--brand-dark), var(--ink));
	color: #fff;
	padding: 5.5rem 0 4.5rem;
}

.hero .eyebrow {
	text-transform: uppercase;
	letter-spacing: 0.14em;
	font-size: 0.78rem;
	font-weight: 600;
	color: rgba(255, 255, 255, 0.75);
}

.hero h1 {
	font-weight: 800;
	letter-spacing: -0.02em;
	font-size: clamp(2.1rem, 4vw, 3.2rem);
}

.hero p.lead {
	color: rgba(255, 255, 255, 0.85);
	max-width: 46rem;
	margin-left: auto;
	margin-right: auto;
}

/* ---------- Section headers ---------- */
.section-eyebrow {
	text-transform: uppercase;
	letter-spacing: 0.12em;
	font-size: 0.78rem;
	font-weight: 700;
	color: var(--brand-dark);
}

.section-title {
	font-weight: 800;
	letter-spacing: -0.02em;
}

.section-lead {
	color: var(--muted);
	max-width: 48rem;
}

section.section-alt {
	background: var(--surface);
}

/* ---------- Cards ---------- */
.card-modern {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	box-shadow: var(--shadow-sm);
	transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
	height: 100%;
}

.card-modern:hover {
	transform: translateY(-4px);
	box-shadow: var(--shadow-lg);
	border-color: var(--brand-light);
}

.icon-badge {
	width: 44px;
	height: 44px;
	border-radius: 12px;
	background: rgba(13, 148, 136, 0.1);
	color: var(--brand-dark);
	display: inline-flex;
	align-items: center;
	justify-content: center;
	font-size: 1.15rem;
	flex-shrink: 0;
}

/* Link card (used for ontology grid + hub page) */
.link-card {
	display: flex;
	align-items: flex-start;
	gap: 1rem;
	padding: 1.35rem;
	color: var(--ink);
}

.link-card .arrow {
	margin-left: auto;
	color: var(--muted);
	transition: transform 0.18s ease, color 0.18s ease;
}

.link-card:hover .arrow {
	transform: translateX(4px);
	color: var(--brand-dark);
}

.link-card .link-title {
	font-weight: 700;
	margin-bottom: 0.2rem;
}

.link-card .link-desc {
	color: var(--muted);
	font-size: 0.92rem;
	margin-bottom: 0;
}

/* ---------- Buttons ---------- */
.btn-brand {
	background: var(--brand);
	border: none;
	color: #fff;
	font-weight: 600;
	padding: 0.65rem 1.4rem;
	border-radius: 999px;
	transition: background 0.15s ease, transform 0.15s ease;
}

.btn-brand:hover {
	background: var(--brand-dark);
	color: #fff;
	transform: translateY(-1px);
}

.btn-outline-brand {
	border: 1.5px solid rgba(255, 255, 255, 0.5);
	color: #fff;
	font-weight: 600;
	padding: 0.6rem 1.35rem;
	border-radius: 999px;
	transition: border-color 0.15s ease, background 0.15s ease;
}

.btn-outline-brand:hover {
	background: rgba(255, 255, 255, 0.12);
	border-color: #fff;
	color: #fff;
}

/* ---------- People ---------- */
.people-group .people-group-title {
	font-weight: 700;
	font-size: 0.8rem;
	text-transform: uppercase;
	letter-spacing: 0.08em;
	color: var(--brand-dark);
	margin-bottom: 0.75rem;
}

.people-group ul {
	list-style: none;
	padding: 0;
	margin: 0;
}

.people-group li {
	padding: 0.3rem 0;
	color: var(--ink);
	font-size: 0.95rem;
	border-bottom: 1px dashed var(--border);
}

.people-group li:last-child {
	border-bottom: none;
}

/* ---------- Accordion tweaks ---------- */
.accordion-ark .accordion-button {
	font-weight: 600;
	background: var(--surface);
}

.accordion-ark .accordion-button:not(.collapsed) {
	color: var(--brand-dark);
	background: rgba(13, 148, 136, 0.06);
	box-shadow: none;
}

.accordion-ark .accordion-item {
	border-color: var(--border);
	border-radius: var(--radius-sm) !important;
	overflow: hidden;
	margin-bottom: 0.75rem;
}

.accordion-ark .video-caption {
	font-weight: 600;
	margin-bottom: 0.75rem;
}

.ratio-video {
	border-radius: var(--radius-sm);
	overflow: hidden;
	box-shadow: var(--shadow-sm);
}

/* ---------- Publications ---------- */
.pub-item {
	padding: 1.1rem 0;
	border-bottom: 1px solid var(--border);
}

.pub-item:last-child {
	border-bottom: none;
}

.pub-year {
	display: inline-block;
	background: rgba(13, 148, 136, 0.1);
	color: var(--brand-dark);
	font-weight: 700;
	font-size: 0.78rem;
	padding: 0.15rem 0.6rem;
	border-radius: 999px;
	margin-bottom: 0.4rem;
}

.pub-title {
	font-weight: 600;
	color: var(--ink);
	margin-bottom: 0.3rem;
}

.pub-links a {
	color: var(--brand-dark);
	font-weight: 600;
	font-size: 0.92rem;
	margin-right: 1rem;
}

.pub-links a:hover {
	text-decoration: underline;
}

/* ---------- Callout / CTA strips ---------- */
.callout {
	border-radius: var(--radius);
	padding: 2rem;
	border: 1px solid var(--border);
	background: var(--surface);
}

/* ---------- Footer ---------- */
.footer-ark {
	background: var(--ink);
	color: rgba(255, 255, 255, 0.7);
	padding: 2.5rem 0;
	font-size: 0.9rem;
}

.footer-ark a {
	color: rgba(255, 255, 255, 0.85);
}

.footer-ark a:hover {
	color: #fff;
}