:root {
	--primary: #004687;
	--secondary: #00619f;
	--accent: #c83f31;
	--ink: #243447;
	--muted: #5f6f7f;
	--line: #dfe7ee;
	--soft: #f5f8fb;
	--white: #ffffff;
}

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	color: var(--ink);
	background: var(--white);
	font-family: Arial, Helvetica, sans-serif;
	line-height: 1.6;
}

a {
	color: inherit;
}

header {
	background: var(--white);
	color: var(--ink);
}

.container {
	width: min(1120px, calc(100% - 40px));
	margin: 0 auto;
}

.site-header {
	display: flex;
	align-items: flex-start;
	flex-direction: column;
	gap: 12px;
	padding: 24px 0 12px;
	border-bottom: 3px solid var(--primary);
}

.brand h1 {
	grid-column: 1;
	grid-row: 1;
	margin: 0;
	font-size: 2rem;
	letter-spacing: 0;
}

.brand {
	display: grid;
	grid-template-columns: auto auto minmax(0, 1fr) auto;
	gap: 4px 28px;
	align-items: center;
	width: 100%;
}

.brand p {
	margin: 0;
	color: var(--muted);
}

.brand-name {
	grid-column: 2;
	grid-row: 1;
	font-size: 1.15rem;
}

.tagline {
	grid-column: 4;
	grid-row: 2;
	justify-self: start;
	font-size: 0.9rem;
}

.header-logos {
	grid-column: 4;
	grid-row: 1;
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 14px;
	justify-self: end;
}

.header-logos img {
	display: block;
	width: auto;
	max-width: 130px;
	max-height: 46px;
	object-fit: contain;
}

.site-nav {
	grid-column: 1 / 3;
	grid-row: 2;
	display: flex;
	flex-wrap: wrap;
	gap: 8px 18px;
	justify-content: flex-start;
}

.site-nav a {
	color: var(--ink);
	font-weight: 700;
	text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus {
	text-decoration: underline;
}

html {
	scroll-behavior: smooth;
}

.site-nav a[aria-current="page"] {
	color: var(--primary);
	text-decoration: underline;
	text-decoration-thickness: 3px;
	text-underline-offset: 6px;
}

.hero,
.intro {
	background: var(--soft);
	padding: 18px 0;
	text-align: center;
}

.hero h2,
.intro h2 {
	margin: 0 0 8px;
	color: var(--primary);
	font-size: 1.9rem;
	line-height: 1.15;
}

.hero p,
.intro p,
.description {
	max-width: 780px;
	margin: 0 auto;
	color: var(--muted);
	font-size: 1.05rem;
}

main {
	padding: 18px 0 32px;
}

.section {
	padding: 18px 0;
}

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

.section h2,
main h1 {
	margin: 0 0 12px;
	color: var(--ink);
	line-height: 1.2;
}

.section h2.center,
.center {
	text-align: center;
}

.grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
	gap: 16px;
	margin-top: 18px;
}

.home-grid {
	max-width: 820px;
	margin-right: auto;
	margin-left: auto;
}

.acknowledgement {
	max-width: 820px;
	border-top: 1px solid var(--line);
}

.acknowledgement p {
	margin: 0;
	color: var(--muted);
}

.card {
	display: flex;
	flex-direction: column;
	gap: 10px;
	min-height: 100%;
	padding: 18px;
	background: var(--white);
	border: 1px solid var(--line);
	border-radius: 8px;
}

.linked-card {
	color: var(--ink);
	text-decoration: none;
}

.linked-card:hover,
.linked-card:focus {
	border-color: var(--primary);
	box-shadow: 0 6px 18px rgba(0, 70, 135, 0.1);
}

.site-panel {
	scroll-margin-top: 20px;
}

.site-panel.container {
	padding-top: 42px;
	padding-bottom: 42px;
	border-top: 1px solid var(--line);
}

.learning-page {
	padding-top: 16px;
}

.section-controls {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 14px;
	margin-bottom: 18px;
}

.section-controls button {
	min-width: 105px;
	padding: 9px 14px;
	color: var(--white);
	background: var(--primary);
	border: 1px solid var(--primary);
	border-radius: 5px;
	font: inherit;
	font-weight: 700;
	cursor: pointer;
}

.section-controls button:hover,
.section-controls button:focus {
	background: var(--secondary);
}

.section-controls button:disabled {
	opacity: 0.4;
	cursor: not-allowed;
}

#section-position {
	color: var(--muted);
	font-size: 0.9rem;
	font-weight: 700;
}

.learning-layout {
	display: grid;
	grid-template-columns: 230px minmax(0, 1fr);
	gap: 24px;
	align-items: start;
}

.contents-nav {
	position: sticky;
	top: 20px;
	padding: 18px;
	background: var(--soft);
	border: 1px solid var(--line);
	border-radius: 8px;
}

.contents-nav h2 {
	margin: 0 0 12px;
	font-size: 1.05rem;
}

.contents-nav ol {
	display: grid;
	gap: 4px;
	margin: 0;
	padding-left: 24px;
}

.contents-nav a {
	display: block;
	padding: 8px 9px;
	color: var(--ink);
	border-left: 3px solid transparent;
	border-radius: 4px;
	text-decoration: none;
}

.contents-nav a:hover,
.contents-nav a:focus {
	background: var(--white);
}

.contents-nav a.active {
	color: var(--primary);
	background: var(--white);
	border-left-color: var(--primary);
	font-weight: 700;
}

.learning-content {
	min-width: 0;
	min-height: 0;
}

.learning-content .site-panel {
	padding: 4px 0 12px;
}

.site-panel > h2 {
	margin-bottom: 8px;
}

.site-panel > p {
	margin: 0 0 8px;
}

.site-panel > .section:first-of-type {
	padding-top: 6px;
}

.section h3 {
	margin: 0 0 10px;
	line-height: 1.25;
}

.mobile-section-nav {
	display: none;
	margin-bottom: 18px;
}

.mobile-section-nav label {
	display: block;
	margin-bottom: 6px;
	font-weight: 700;
}

.mobile-section-nav select {
	width: 100%;
	padding: 10px;
	color: var(--ink);
	background: var(--white);
	border: 1px solid var(--line);
	border-radius: 5px;
	font: inherit;
}

.card h3 {
	margin: 0;
	color: var(--ink);
	line-height: 1.3;
}

.card p {
	margin: 0;
	color: var(--muted);
}

.card a,
.video-card a,
.btn {
	align-self: flex-start;
	margin-top: auto;
	font-weight: 700;
	text-decoration: none;
}

.btn {
	display: inline-block;
	padding: 11px 18px;
	color: var(--white);
	background: var(--primary);
	border-radius: 4px;
}

.btn:hover,
.btn:focus {
	background: var(--secondary);
}

.badge {
	display: inline-block;
	width: fit-content;
	padding: 4px 9px;
	color: var(--ink);
	background: var(--white);
	border: 1px solid var(--line);
	border-radius: 4px;
	font-size: 0.85rem;
	font-weight: 700;
}

.tag-row {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	margin-top: auto;
}

.tag-row a {
	display: inline-block;
	padding: 6px 10px;
	color: var(--ink);
	background: var(--white);
	border: 1px solid var(--line);
	border-radius: 4px;
	font-size: 0.9rem;
	font-weight: 700;
	text-decoration: none;
}

.tag-row a:hover,
.tag-row a:focus {
	color: var(--ink);
	background: var(--soft);
	border-color: var(--primary);
}

.notice {
	padding: 18px;
	background: var(--white);
	border-left: 4px solid var(--accent);
	color: var(--ink);
}

.resource-list {
	display: grid;
	gap: 14px;
	padding: 0;
	list-style: none;
}

.resource-list li {
	padding: 16px;
	border: 1px solid var(--line);
	border-radius: 8px;
}

.resource-list a {
	color: var(--ink);
	font-weight: 700;
	text-decoration: none;
}

.resource-list a:hover,
.resource-list a:focus {
	color: var(--ink);
	text-decoration: none;
}

.resource-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
	gap: 12px;
	margin-top: 18px;
}

.resource-card {
	display: flex;
	align-items: center;
	min-height: 88px;
	padding: 16px;
	color: var(--ink);
	background: var(--white);
	border: 1px solid var(--line);
	border-radius: 8px;
	font-weight: 700;
	text-decoration: none;
}

.resource-card:hover,
.resource-card:focus {
	color: var(--ink);
	background: var(--soft);
	border-color: var(--primary);
}

.shared-resource {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	margin-top: 16px;
	padding: 16px 18px;
	background: var(--white);
	border: 1px solid var(--line);
	border-left: 4px solid var(--primary);
	border-radius: 8px;
}

.compact-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
	gap: 14px;
	margin-top: 18px;
}

.compact-card {
	padding: 16px;
	background: var(--white);
	border: 1px solid var(--line);
	border-radius: 8px;
}

.compact-card h3,
.compact-card p {
	margin: 0;
}

.compact-card h3 {
	color: var(--ink);
}

.compact-card p {
	margin-top: 8px;
	color: var(--muted);
}

.shared-resource h3,
.shared-resource p {
	margin: 0;
}

.shared-resource h3 {
	margin-top: 6px;
	color: var(--ink);
}

.shared-resource p {
	color: var(--muted);
}

.shared-resource a {
	flex: 0 0 auto;
	color: var(--ink);
	font-weight: 700;
	text-decoration: none;
}

.shared-resource a:hover,
.shared-resource a:focus {
	color: var(--ink);
}

.table-wrap {
	overflow-x: auto;
}

.resource-table {
	width: 100%;
	border-collapse: collapse;
	background: var(--white);
	border-top: 2px solid var(--line);
}

.resource-table th,
.resource-table td {
	padding: 14px 16px;
	border-bottom: 1px solid var(--line);
	text-align: left;
	vertical-align: top;
}

.resource-table th {
	color: var(--ink);
	background: var(--white);
}

.resource-table tr:last-child td {
	border-bottom: 0;
}

.video-frame {
	width: 100%;
	aspect-ratio: 16 / 9;
	border: 0;
	background: var(--soft);
}

.demo-layout {
	display: grid;
	grid-template-columns: minmax(0, 1fr) 260px;
	gap: 28px;
	align-items: start;
	margin-top: 40px;
}

.demo-panels {
	min-width: 0;
}

.demo-panel {
	display: none;
}

.demo-panel.active {
	display: block;
}

.demo-panel h2 {
	margin-top: 0;
}

.demo-tabs {
	position: sticky;
	top: 24px;
	display: grid;
	gap: 10px;
	padding: 16px;
	background: var(--soft);
	border: 1px solid var(--line);
	border-radius: 8px;
}

.demo-tab {
	width: 100%;
	padding: 12px 14px;
	color: var(--ink);
	background: var(--white);
	border: 1px solid var(--line);
	border-radius: 6px;
	font: inherit;
	font-weight: 700;
	text-align: left;
	cursor: pointer;
}

.demo-tab:hover,
.demo-tab:focus,
.demo-tab.active {
	color: var(--ink);
	background: var(--soft);
	border-color: var(--primary);
}

.video-card {
	display: grid;
	grid-template-columns: minmax(260px, 1fr) minmax(240px, 0.75fr);
	gap: 18px;
	align-items: center;
	margin: 18px 0;
	padding: 18px;
	background: var(--white);
	border: 1px solid var(--line);
	border-radius: 8px;
}

.demo-video-list {
	display: grid;
	gap: 16px;
	margin-top: 18px;
}

.demo-video-card {
	display: grid;
	grid-template-columns: minmax(280px, 0.95fr) minmax(260px, 1fr);
	gap: 18px;
	align-items: center;
}

.demo-video-media {
	display: grid;
	gap: 12px;
	min-width: 0;
}

.demo-video-card p {
	align-self: center;
}

.video-slot {
	position: relative;
	border: 1px solid var(--line);
	border-radius: 8px;
	background:
		linear-gradient(135deg, rgba(0, 70, 135, 0.08), rgba(0, 97, 159, 0.14)),
		var(--soft);
}

.video-slot::after {
	content: "";
	position: absolute;
	top: 50%;
	left: 50%;
	width: 0;
	height: 0;
	border-top: 18px solid transparent;
	border-bottom: 18px solid transparent;
	border-left: 28px solid var(--ink);
	transform: translate(-40%, -50%);
}

.video-embed {
	overflow: hidden;
	background: #000;
}

.video-embed::after {
	content: none;
}

.video-embed iframe {
	display: block;
	width: 100%;
	height: 100%;
	border: 0;
}

footer {
	padding: 16px 0;
	background: var(--white);
	color: var(--muted);
	border-top: 1px solid var(--line);
	text-align: center;
}

footer p {
	margin: 0;
}

@media (max-width: 760px) {
	.site-header {
		align-items: flex-start;
		flex-direction: column;
	}

	.brand {
		grid-template-columns: 1fr;
	}

	.header-logos,
	.tagline,
	.site-nav {
		grid-column: auto;
		grid-row: auto;
	}

	.site-nav {
		justify-content: flex-start;
	}

	.hero,
	.intro {
		padding: 22px 0;
	}

	.demo-layout {
		grid-template-columns: 1fr;
	}

	.demo-tabs {
		position: static;
		order: -1;
	}

	.video-card {
		grid-template-columns: 1fr;
	}

	.demo-video-card {
		grid-template-columns: 1fr;
	}

	.shared-resource {
		align-items: flex-start;
		flex-direction: column;
	}

	.learning-layout {
		display: block;
	}

	.contents-nav {
		display: none;
	}

	.mobile-section-nav {
		display: block;
	}
}

@media (min-width: 761px) {
	.site-header {
		display: flex;
		align-items: flex-start;
		flex-direction: column;
	}

}
.demonstration-page {
	padding-top: 2rem;
	padding-bottom: 4rem;
}

.breadcrumb {
	display: flex;
	flex-wrap: wrap;
	gap: 0.5rem;
	margin-bottom: 2rem;
	font-size: 0.95rem;
}

.breadcrumb a {
	text-decoration: none;
}

.demonstration-hero {
	padding: 2rem;
	margin-bottom: 2rem;
	background: #f4f7fb;
	border-left: 5px solid #004687;
	border-radius: 0.75rem;
}

.demonstration-hero h1 {
	margin-top: 0.75rem;
	margin-bottom: 0.75rem;
}

.mechanism-flow {
	display: grid;
	grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
	gap: 1rem;
	align-items: stretch;
}

.mechanism-step {
	padding: 1.25rem;
	background: #ffffff;
	border: 1px solid #dce3ec;
	border-radius: 0.75rem;
}

.mechanism-step p {
	margin-bottom: 0;
}

.mechanism-arrow {
	display: flex;
	align-items: center;
	font-size: 1.75rem;
	font-weight: 700;
}

.analysis-chain {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 1rem;
	margin: 0;
}

.analysis-chain > div {
	padding: 1.25rem;
	background: #ffffff;
	border-top: 4px solid #004687;
	border-radius: 0.5rem;
	box-shadow: 0 0.2rem 0.6rem rgba(0, 0, 0, 0.08);
}

.analysis-chain dt {
	margin-bottom: 0.5rem;
	font-weight: 700;
}

.analysis-chain dd {
	margin: 0;
}

.resource-links {
	display: flex;
	flex-wrap: wrap;
	gap: 0.75rem;
}

.resource-links a {
	display: inline-block;
	padding: 0.75rem 1rem;
	border: 1px solid #004687;
	border-radius: 0.4rem;
	text-decoration: none;
}

@media (max-width: 900px) {
	.mechanism-flow {
		grid-template-columns: 1fr;
	}

	.mechanism-arrow {
		justify-content: center;
		transform: rotate(90deg);
	}

	.analysis-chain {
		grid-template-columns: 1fr;
	}
}

.concept-figure {
	max-width: 800px;
	margin: 1.5rem auto;
	text-align: center;
}

.concept-figure img {
	display: block;
	width: 100%;
	height: auto;
	border-radius: 0.75rem;
	box-shadow: 0 0.25rem 0.9rem rgba(0, 0, 0, 0.12);
}

.concept-figure figcaption {
	margin-top: 0.75rem;
	font-size: 0.95rem;
	color: #4b5563;
}

.team-biographies {
	margin-top: 3rem;
}

.team-biography {
	scroll-margin-top: 2rem;
	padding: 2rem;
	margin-bottom: 1.5rem;
	background: #ffffff;
	border: 1px solid #dce3ec;
	border-radius: 0.75rem;
}

.team-biography h2 {
	margin-top: 0;
}

.profile-heading {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	gap: 12px;
}

.profile-heading h2 {
	margin: 0;
}

.profile-links {
	display: flex;
	flex: 0 0 auto;
	flex-wrap: wrap;
	gap: 8px;
}

.profile-link {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-width: 34px;
	min-height: 34px;
	padding: 5px 8px;
	color: var(--ink);
	border: 1px solid var(--line);
	border-radius: 4px;
	font-size: 0.85rem;
	font-weight: 700;
	text-decoration: none;
}

.profile-link:hover,
.profile-link:focus {
	border-color: var(--primary);
}

.linkedin-link {
	color: var(--white);
	background: #0a66c2;
	border-color: #0a66c2;
	font-family: Arial, Helvetica, sans-serif;
	font-weight: 700;
}

.team-biography h3 {
	margin-top: 0.25rem;
	color: #4b5563;
}

.team-biography > a {
	display: inline-block;
	margin-top: 0.75rem;
}

.project-logos {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 1.5rem;
	margin-bottom: 1.5rem;
}

.project-logos img {
	display: block;
	width: auto;
	max-width: 140px;
	max-height: 50px;
	object-fit: contain;
}
@media (max-width: 600px) {
	.project-logos img {
		max-width: 120px;
		max-height: 42px;
	}
}