/* ---------- Buttons ---------- */
.btn {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.85rem 1.6rem;
	border-radius: var(--radius-full);
	font-weight: var(--fw-semibold);
	font-size: var(--fs-sm);
	line-height: 1;
	border: 1px solid transparent;
	cursor: pointer;
	transition: transform 0.15s var(--ease-out), background 0.15s var(--ease-out), color 0.15s var(--ease-out), border-color 0.15s var(--ease-out);
	white-space: nowrap;
}
.btn-primary {
	background: var(--color-accent);
	color: var(--color-accent-ink);
}
.btn-primary:hover { background: var(--color-accent-deep); color: #fff; }
.btn-ghost {
	background: transparent;
	color: var(--color-fg);
	border-color: var(--color-line);
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn-light {
	background: #fff; color: var(--color-fg); border-color: var(--color-line);
}
.btn-arrow::after { content: "→"; font-weight: var(--fw-bold); transition: transform 0.15s var(--ease-out); }
.btn:hover .btn-arrow::after, .btn-arrow:hover::after { transform: translateX(3px); }

.linkout {
	color: var(--color-accent);
	font-weight: var(--fw-semibold);
	display: inline-flex; gap: 0.35rem; align-items: center;
}
.linkout::after { content: "→"; transition: transform 0.15s var(--ease-out); }
.linkout:hover::after { transform: translateX(3px); }

/* ---------- Header ---------- */
.site-header {
	position: sticky;
	top: 0;
	z-index: 50;
	background: rgba(255, 255, 255, 0.92);
	backdrop-filter: saturate(1.4) blur(12px);
	border-bottom: 1px solid var(--color-line);
}
.site-header .container {
	display: flex; align-items: center; justify-content: space-between;
	min-height: 76px;
}
.site-brand {
	display: flex; align-items: center; gap: 0.65rem;
	color: var(--color-fg); font-weight: var(--fw-bold); letter-spacing: -0.01em;
	font-size: 1.05rem;
}
.site-brand .brand-mark {
	width: 32px; height: 32px;
	border-radius: 8px;
	background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-deep) 100%);
	display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 0.85rem;
}
.primary-nav ul {
	list-style: none; margin: 0; padding: 0;
	display: flex; gap: 1.75rem;
}
.primary-nav a {
	color: var(--color-fg); font-weight: var(--fw-medium); font-size: var(--fs-sm);
}
.primary-nav a:hover { color: var(--color-accent); }
.header-cta { display: flex; align-items: center; gap: 0.75rem; }
.nav-toggle {
	display: none; background: none; border: 0; padding: 0.5rem;
	cursor: pointer;
}
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 900px) {
	.primary-nav { display: none; }
	.header-cta .btn-ghost { display: none; }
	.nav-toggle { display: block; }
	.primary-nav.is-open {
		display: block;
		position: absolute; left: 0; right: 0; top: 100%;
		background: #fff; border-bottom: 1px solid var(--color-line);
		padding: 1rem var(--container-pad) 1.5rem;
	}
	.primary-nav.is-open ul { flex-direction: column; gap: 1rem; }
}

/* ---------- Hero ---------- */
.hero {
	background:
		radial-gradient(1200px 600px at 90% -10%, rgba(108, 63, 240, 0.18), transparent 60%),
		radial-gradient(900px 500px at 10% 0%, rgba(108, 63, 240, 0.10), transparent 60%),
		linear-gradient(180deg, #ffffff 0%, var(--color-surface) 100%);
	padding-top: clamp(4rem, 9vw, 8rem);
	padding-bottom: clamp(4rem, 9vw, 8rem);
	position: relative;
	overflow: hidden;
}
.hero-inner { max-width: 920px; }
.hero h1 { margin-bottom: 1rem; }
.hero p.lead {
	font-size: clamp(var(--fs-lg), 2vw, var(--fs-xl));
	color: var(--color-muted);
	max-width: 60ch;
	margin-bottom: 2rem;
	line-height: var(--lh-snug);
}
.hero-ctas { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.hero-meta {
	margin-top: 2.5rem;
	display: flex; flex-wrap: wrap; gap: 1rem 2rem;
	color: var(--color-muted); font-size: var(--fs-sm);
}

/* ---------- Logo strip ---------- */
.logo-strip {
	padding: 2.5rem 0;
	border-top: 1px solid var(--color-line);
	border-bottom: 1px solid var(--color-line);
}
.logo-strip .grid {
	display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
	gap: 1.5rem 2rem; align-items: center; justify-items: center;
}
.logo-strip .logo {
	color: var(--color-muted); font-weight: var(--fw-semibold); font-size: var(--fs-sm);
	letter-spacing: 0.04em;
	opacity: 0.78;
}

/* ---------- Stats banner ---------- */
.stats {
	background: linear-gradient(135deg, #1b1430 0%, #0f0a20 100%);
	color: #fff;
	border-radius: var(--radius-lg);
	padding: clamp(2rem, 5vw, 3.5rem);
	margin-top: var(--section-gap);
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
	gap: 2rem;
}
.stats .stat .num {
	font-size: clamp(2rem, 4vw, var(--fs-4xl));
	font-weight: var(--fw-bold);
	background: linear-gradient(120deg, #fff 0%, #c5b3ff 100%);
	-webkit-background-clip: text; background-clip: text; color: transparent;
	letter-spacing: -0.02em; line-height: 1;
}
.stats .stat .label {
	margin-top: 0.5rem; color: #b9b1d2; font-size: var(--fs-sm);
}

/* ---------- Dual feature ---------- */
.dual-feature .grid {
	display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
	gap: 1.5rem;
}
.dual-feature .card {
	background: var(--color-surface);
	border-radius: var(--radius-lg);
	padding: clamp(1.5rem, 3vw, 2.5rem);
	display: flex; flex-direction: column; gap: 1rem;
	border: 1px solid var(--color-line);
}
.dual-feature .card h3 { margin: 0; }
.dual-feature .card p { color: var(--color-muted); margin: 0; }

/* ---------- Feature grid (4-up) ---------- */
.feature-grid .grid {
	display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
	gap: 1.25rem;
}
.feature-card {
	background: #fff;
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	padding: 1.5rem;
	transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--color-accent-soft); }
.feature-card .icon {
	width: 48px; height: 48px;
	background: var(--color-accent-soft);
	color: var(--color-accent);
	border-radius: 12px;
	display: grid; place-items: center;
	margin-bottom: 1rem;
	font-weight: 700;
}
.feature-card h3 { font-size: var(--fs-lg); margin-bottom: 0.5rem; }
.feature-card p { color: var(--color-muted); margin: 0; font-size: var(--fs-sm); }

/* ---------- Awards carousel ---------- */
.awards {
	background: var(--color-surface);
	padding: var(--section-gap) 0;
}
.awards-track {
	display: grid;
	grid-auto-flow: column;
	grid-auto-columns: minmax(300px, 1fr);
	gap: 1.25rem;
	overflow-x: auto;
	scroll-snap-type: x mandatory;
	padding-bottom: 1rem;
	scrollbar-width: thin;
}
.award-card {
	background: #fff;
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	padding: 1.5rem;
	scroll-snap-align: start;
	display: flex; flex-direction: column; gap: 0.75rem;
}
.award-card .badge {
	background: var(--color-accent-soft); color: var(--color-accent-deep);
	font-size: var(--fs-xs); font-weight: var(--fw-semibold);
	padding: 0.25rem 0.6rem; border-radius: var(--radius-full);
	align-self: flex-start;
}
.award-card blockquote { margin: 0; color: var(--color-fg); font-size: var(--fs-base); }
.award-card cite {
	color: var(--color-muted); font-size: var(--fs-sm); font-style: normal;
}

/* ---------- 3up cards (Knowledge hub) ---------- */
.cards-3up .grid {
	display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
	gap: 1.25rem;
}
.card-3 {
	display: flex; flex-direction: column;
	background: #fff;
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	overflow: hidden;
	transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}
.card-3:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.card-3 .media {
	background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-deep) 100%);
	color: #fff; padding: 1.5rem; min-height: 160px;
	display: flex; align-items: flex-end;
}
.card-3 .media h4 { color: #fff; margin: 0; }
.card-3 .body { padding: 1.25rem 1.5rem 1.5rem; display: flex; flex-direction: column; gap: 0.75rem; flex: 1; }
.card-3 .body .tag {
	font-size: var(--fs-xs); color: var(--color-accent);
	text-transform: uppercase; letter-spacing: 0.1em; font-weight: var(--fw-semibold);
}
.card-3 .body p { margin: 0; color: var(--color-muted); font-size: var(--fs-sm); }
.card-3 .body .linkout { margin-top: auto; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; }
.faq details {
	border-bottom: 1px solid var(--color-line);
	padding: 1.25rem 0;
}
.faq summary {
	cursor: pointer;
	font-size: var(--fs-lg);
	font-weight: var(--fw-semibold);
	color: var(--color-fg);
	list-style: none;
	display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
	content: "+";
	color: var(--color-accent); font-size: 1.6rem; line-height: 1;
	transition: transform 0.2s var(--ease-out);
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details > div { padding-top: 0.75rem; color: var(--color-muted); }

/* ---------- News card grid ---------- */
.news-grid {
	display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
	gap: 1.5rem;
}
.news-card {
	display: flex; flex-direction: column;
	background: #fff;
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	overflow: hidden;
	transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}
.news-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.news-card .thumb {
	aspect-ratio: 16 / 9;
	background: linear-gradient(135deg, var(--color-accent-soft), var(--color-surface-2));
	background-size: cover; background-position: center;
}
.news-card .body { padding: 1.25rem 1.5rem 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
.news-card time { color: var(--color-muted); font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.08em; font-weight: var(--fw-semibold); }
.news-card h3 { font-size: var(--fs-lg); margin: 0; }
.news-card p { color: var(--color-muted); font-size: var(--fs-sm); margin: 0; }
.news-card .linkout { margin-top: auto; }

/* ---------- Team grid ---------- */
.team-group { margin-bottom: 3rem; }
.team-group h2 { margin-bottom: 1.5rem; font-size: clamp(var(--fs-xl), 2.4vw, var(--fs-2xl)); }
.team-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
	gap: 1.25rem;
}
.team-card {
	background: #fff;
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	padding: 1.25rem;
	text-align: center;
	transition: border-color 0.2s var(--ease-out), transform 0.2s var(--ease-out);
}
.team-card:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.team-card .avatar {
	width: 96px; height: 96px;
	border-radius: 50%;
	margin: 0 auto 0.75rem;
	background: linear-gradient(135deg, var(--color-accent-soft) 0%, var(--color-surface-2) 100%);
	display: grid; place-items: center;
	color: var(--color-accent-deep);
	font-weight: var(--fw-bold);
	font-size: 1.5rem;
	overflow: hidden;
	background-size: cover; background-position: center;
}
.team-card .name { font-weight: var(--fw-semibold); font-size: var(--fs-base); color: var(--color-fg); margin: 0.35rem 0 0.1rem; }
.team-card .role { color: var(--color-muted); font-size: var(--fs-sm); margin: 0; }

/* ---------- Section heading block ---------- */
.section-head {
	max-width: 720px; margin: 0 auto 2.5rem;
	text-align: center;
}
.section-head .eyebrow { margin-bottom: 0.75rem; }
.section-head p { color: var(--color-muted); font-size: var(--fs-lg); margin: 0.5rem 0 0; }

/* ---------- Research alternating rows ---------- */
.research-row { padding: clamp(2.5rem, 6vw, 4.5rem) 0; }
.research-row + .research-row { border-top: 1px solid var(--color-line); }
.research-row .grid {
	display: grid;
	grid-template-columns: 1.05fr 0.95fr;
	gap: clamp(2rem, 5vw, 4rem);
	align-items: center;
}
.research-row.reverse .grid { grid-template-columns: 0.95fr 1.05fr; }
.research-row.reverse .copy { order: 2; }
.research-row.reverse .visual { order: 1; }
.research-row .copy h2 { margin-bottom: 1rem; }
.research-row .copy h2 a { color: var(--color-fg); }
.research-row .copy h2 a:hover { color: var(--color-accent); }
.visual-card {
	aspect-ratio: 4 / 3;
	border-radius: var(--radius-lg);
	background:
		radial-gradient(circle at 30% 30%, rgba(255,255,255,0.4), transparent 60%),
		linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-deep) 100%);
	display: grid; place-items: center;
	color: #fff;
	box-shadow: var(--shadow-lg);
}
.visual-icon {
	font-size: clamp(3rem, 8vw, 6rem);
	font-weight: var(--fw-bold);
	letter-spacing: -0.04em;
	opacity: 0.95;
}
@media (max-width: 760px) {
	.research-row .grid, .research-row.reverse .grid { grid-template-columns: 1fr; }
	.research-row.reverse .copy { order: initial; }
	.research-row.reverse .visual { order: initial; }
}

/* ---------- Filter chips ---------- */
.filter-chips {
	display: flex; flex-wrap: wrap; gap: 0.5rem;
	margin-bottom: 2.5rem;
}
.chip {
	display: inline-flex; align-items: center; gap: 0.35rem;
	padding: 0.45rem 1rem;
	border-radius: var(--radius-full);
	background: var(--color-surface);
	color: var(--color-fg);
	font-size: var(--fs-sm);
	font-weight: var(--fw-medium);
	border: 1px solid var(--color-line);
	transition: background 0.15s var(--ease-out), color 0.15s var(--ease-out), border-color 0.15s var(--ease-out);
}
.chip:hover { background: var(--color-accent-soft); color: var(--color-accent-deep); }
.chip.is-active { background: var(--color-accent); color: var(--color-accent-ink); border-color: var(--color-accent); }
.chip .count { opacity: 0.7; font-weight: var(--fw-regular); }

/* ---------- Publications archive ---------- */
.pubs-archive .year-block {
	display: grid;
	grid-template-columns: 140px 1fr;
	gap: 2rem;
	margin-bottom: 3rem;
}
.year-label {
	position: sticky; top: 96px; align-self: start;
}
.year-number {
	font-size: 2.5rem; font-weight: var(--fw-bold);
	letter-spacing: -0.02em; color: var(--color-fg);
	line-height: 1;
}
.year-count { color: var(--color-muted); font-size: var(--fs-sm); margin-top: 0.25rem; }

.pub-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 1rem; }
.pub-item {
	background: #fff;
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	padding: 1.25rem 1.5rem;
	transition: border-color 0.15s var(--ease-out), box-shadow 0.15s var(--ease-out);
}
.pub-item:hover { border-color: var(--color-accent-soft); box-shadow: var(--shadow-sm); }
.pub-title { font-size: var(--fs-lg); margin: 0 0 0.5rem; line-height: var(--lh-snug); }
.pub-authors { color: var(--color-fg); font-size: var(--fs-sm); margin: 0 0 0.35rem; }
.pub-authors strong { color: var(--color-accent-deep); }
.pub-meta { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; margin: 0 0 0.5rem; font-size: var(--fs-sm); color: var(--color-muted); }
.pub-venue { font-style: italic; }
.pub-type {
	background: var(--color-accent-soft); color: var(--color-accent-deep);
	padding: 0.15rem 0.55rem; border-radius: var(--radius-full);
	font-size: var(--fs-xs); font-weight: var(--fw-semibold);
	text-transform: uppercase; letter-spacing: 0.06em;
}
.pub-links { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0; }
.pub-link {
	display: inline-flex; align-items: center; gap: 0.35rem;
	padding: 0.35rem 0.85rem; border-radius: var(--radius-full);
	border: 1px solid var(--color-line); background: #fff;
	color: var(--color-fg); font-size: var(--fs-xs); font-weight: var(--fw-semibold);
	letter-spacing: 0.03em;
}
.pub-link:hover { border-color: var(--color-accent); color: var(--color-accent); }

@media (max-width: 700px) {
	.pubs-archive .year-block { grid-template-columns: 1fr; gap: 1rem; }
	.year-label { position: static; }
	.year-number { font-size: 1.8rem; }
}

/* ---------- Footer ---------- */
.site-footer {
	background: #0b0b14;
	color: #c8cad6;
	padding: 4rem 0 2rem;
	margin-top: var(--section-gap);
}
.site-footer a { color: #c8cad6; }
.site-footer a:hover { color: #fff; }
.site-footer .grid {
	display: grid; grid-template-columns: 1.4fr repeat(auto-fit, minmax(160px, 1fr));
	gap: 2.5rem;
	padding-bottom: 3rem;
	border-bottom: 1px solid rgba(255,255,255,0.08);
}
.site-footer h4 {
	color: #fff;
	font-size: var(--fs-sm);
	text-transform: uppercase; letter-spacing: 0.12em;
	margin: 0 0 1rem;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.6rem; }
.site-footer .brand { color: #fff; font-weight: var(--fw-bold); margin-bottom: 0.5rem; }
.site-footer .lede { color: #8d92a8; font-size: var(--fs-sm); max-width: 38ch; }
.site-footer .bottom {
	padding-top: 1.5rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
	color: #8d92a8; font-size: var(--fs-xs);
}