/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
	background: #f0f6fa;
	color: #1a2b3c;
	line-height: 1.65;
}

a { color: #0d7fa5; text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout helpers ── */
.container {
	max-width: 860px;
	margin: 0 auto;
	padding: 0 1.5rem;
}

/* ── Hero ── */
.hero {
	background: linear-gradient(135deg, #0a4f6e 0%, #0d7fa5 60%, #12a89d 100%);
	color: #fff;
	padding: 4rem 1.5rem 3.5rem;
	text-align: center;
}

.hero-inner {
	max-width: 720px;
	margin: 0 auto;
}

.hero-partner {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.6rem;
	margin-bottom: 1.25rem;
	font-size: 0.82rem;
	color: rgba(255,255,255,0.65);
	letter-spacing: 0.02em;
}

.hero-logo {
	height: 28px;
	width: auto;
	filter: brightness(0) invert(1);
	opacity: 0.85;
}

.badge {
	display: inline-block;
	background: rgba(255,255,255,0.18);
	border: 1px solid rgba(255,255,255,0.35);
	border-radius: 999px;
	padding: 0.3rem 1rem;
	font-size: 0.85rem;
	margin-bottom: 1.2rem;
	letter-spacing: 0.04em;
}

.hero h1 {
	font-size: clamp(2rem, 5vw, 3rem);
	font-weight: 800;
	margin-bottom: 1rem;
	color: #fff;
}

.hero .subtitle {
	font-size: 1.1rem;
	color: rgba(255,255,255,0.88);
	margin-bottom: 2rem;
}

.hero .subtitle a { color: #a8e6f0; }
.hero .subtitle a:hover { color: #fff; }

.hero-actions {
	display: flex;
	gap: 1rem;
	justify-content: center;
	flex-wrap: wrap;
}

/* ── Buttons ── */
.btn {
	display: inline-block;
	padding: 0.65rem 1.5rem;
	border-radius: 8px;
	font-size: 0.95rem;
	font-weight: 600;
	cursor: pointer;
	transition: opacity 0.15s, transform 0.1s;
}
.btn:hover { opacity: 0.88; transform: translateY(-1px); text-decoration: none; }

.btn-primary {
	background: #fff;
	color: #0a4f6e;
}

.btn-outline {
	background: transparent;
	color: #fff;
	border: 2px solid rgba(255,255,255,0.6);
}

.btn-outline-dark {
	background: transparent;
	color: #0a4f6e;
	border: 2px solid #0d7fa5;
}

/* ── Sections ── */
.section {
	padding: 3.5rem 0;
}

.section-alt {
	background: #fff;
}

.section h2 {
	font-size: 1.6rem;
	font-weight: 700;
	color: #0a4f6e;
	margin-bottom: 1rem;
	padding-bottom: 0.5rem;
	border-bottom: 3px solid #0d7fa5;
	display: inline-block;
}

.section p, .section li {
	color: #3a4f60;
	font-size: 1rem;
	margin-top: 0.6rem;
}

.section ul, .section ol {
	padding-left: 1.4rem;
	margin-top: 0.8rem;
}

.section li { margin-bottom: 0.4rem; }

/* ── Info cards grid ── */
.card-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
	gap: 1.25rem;
	margin-top: 1.5rem;
}

.info-card {
	background: #f0f6fa;
	border: 1px solid #c8dfe8;
	border-radius: 12px;
	padding: 1.25rem 1rem;
}

.info-icon {
	font-size: 1.8rem;
	margin-bottom: 0.5rem;
}

.info-card h3 {
	font-size: 1rem;
	font-weight: 700;
	color: #0a4f6e;
	margin-bottom: 0.3rem;
}

.info-card p {
	font-size: 0.9rem;
	color: #4a6070;
	margin: 0;
}

/* ── Steps list ── */
.steps {
	list-style: none;
	padding: 0;
	margin-top: 1.25rem;
	display: flex;
	flex-direction: column;
	gap: 1.25rem;
}

.steps li {
	display: flex;
	align-items: flex-start;
	gap: 1rem;
	margin: 0;
}

.step-num {
	min-width: 2.2rem;
	height: 2.2rem;
	display: flex;
	align-items: center;
	justify-content: center;
	background: #0d7fa5;
	color: #fff;
	border-radius: 50%;
	font-weight: 700;
	font-size: 1rem;
	flex-shrink: 0;
}

.steps strong {
	display: block;
	color: #0a4f6e;
	font-size: 1rem;
	margin-bottom: 0.2rem;
}

.steps p {
	margin: 0;
	color: #4a6070;
	font-size: 0.95rem;
}

/* ── CTA block ── */
.cta-block {
	text-align: center;
}

.cta-block h2 { display: block; border: none; margin-bottom: 0.75rem; }
.cta-block p { max-width: 520px; margin: 0 auto 1.5rem; }
.cta-block .btn-primary {
	background: #0d7fa5;
	color: #fff;
}

/* ── Track cards ── */
.track-card { display: flex; flex-direction: column; gap: 0.5rem; }
.track-format {
	font-size: 0.82rem;
	color: #5a7080;
	background: #e4f0f6;
	border-radius: 6px;
	padding: 0.4rem 0.6rem;
	margin-top: auto;
}
.track-format code {
	font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
	font-size: 0.8rem;
}

/* ── Prize grid ── */
.prize-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
	gap: 1rem;
	margin-top: 1.25rem;
}

.prize-card {
	border-radius: 12px;
	padding: 1.25rem 1rem;
	text-align: center;
	border: 1px solid transparent;
}

.prize-place {
	font-size: 0.85rem;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	margin-bottom: 0.4rem;
}

.prize-amount {
	font-size: 1.6rem;
	font-weight: 800;
}

.prize-card.gold   { background: #fef9e7; border-color: #f5c842; color: #7a5a00; }
.prize-card.silver { background: #f4f6f7; border-color: #b0bec5; color: #37474f; }
.prize-card.bronze { background: #fdf0e8; border-color: #e0926a; color: #7a3a10; }
.prize-card.special { background: #edf6f0; border-color: #5cb88a; color: #1a5c38; }

/* ── Judging criteria bars ── */
.criteria-list {
	display: flex;
	flex-direction: column;
	gap: 0.9rem;
	margin-top: 1.25rem;
}

.criterion {
	display: flex;
	flex-direction: column;
	gap: 0.35rem;
	padding-bottom: 1.25rem;
	margin-bottom: 0.5rem;
	border-bottom: 1px solid #d0e8f0;
}

.criterion:last-child {
	border-bottom: none;
	padding-bottom: 0;
	margin-bottom: 0;
}

.criteria-stacked-bar {
	display: flex;
	height: 14px;
	border-radius: 999px;
	overflow: visible;
	margin: 1.25rem 0 1.5rem;
	gap: 2px;
}

.csb-seg {
	flex: 0 0 var(--w);
	background: var(--c);
	position: relative;
	cursor: default;
	transition: filter 0.15s ease, transform 0.15s ease;
}

/* clip bar shape but allow tooltip to overflow */
.criteria-stacked-bar > .csb-seg:first-child { border-radius: 999px 0 0 999px; }
.criteria-stacked-bar > .csb-seg:last-child  { border-radius: 0 999px 999px 0; }

.csb-seg:hover {
	filter: brightness(1.15);
	z-index: 1;
}

.csb-seg::after {
	content: attr(data-tip);
	position: absolute;
	bottom: calc(100% + 8px);
	left: 50%;
	transform: translateX(-50%);
	background: #1a2b3c;
	color: #fff;
	font-size: 0.78rem;
	white-space: nowrap;
	padding: 0.3rem 0.6rem;
	border-radius: 5px;
	pointer-events: none;
	opacity: 0;
	transition: opacity 0.15s ease;
	z-index: 10;
}

.csb-seg:hover::after {
	opacity: 1;
}

.criterion-swatch {
	display: inline-block;
	width: 10px;
	height: 10px;
	border-radius: 2px;
	background: var(--c);
	margin-right: 0.45rem;
	vertical-align: middle;
	flex-shrink: 0;
}

.criterion-label {
	display: flex;
	justify-content: space-between;
	font-size: 0.9rem;
	color: #3a4f60;
}

.criterion-label strong { color: #0a4f6e; }

/* ── Overview sidebar layout ── */
.overview-layout {
	display: flex;
	align-items: flex-start;
}

.overview-toc {
	position: sticky;
	top: 0;
	width: 180px;
	flex-shrink: 0;
	padding: 2rem 1.25rem 2rem 1rem;
	display: flex;
	flex-direction: column;
	gap: 0.15rem;
	border-left: 1px solid #d0e8f0;
	min-height: 100%;
}

.overview-content {
	flex: 1;
	min-width: 0;
}

.toc-label {
	font-size: 0.72rem;
	font-weight: 700;
	color: #6a8090;
	text-transform: uppercase;
	letter-spacing: 0.08em;
	padding: 0 0 0.5rem 0.5rem;
	white-space: nowrap;
}

.toc-link {
	font-size: 0.875rem;
	color: #3a4f60;
	padding: 0.3rem 0.5rem;
	border-radius: 5px;
	border-left: 2px solid transparent;
	white-space: nowrap;
	transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.toc-link:hover,
.toc-link.active {
	background: #e8f4fb;
	color: #1a7dbb;
	border-left-color: #1f9bea;
	text-decoration: none;
}

.toc-link.toc-top {
	margin-top: 0.75rem;
	padding-top: 0.3rem;
	border-top: 1px solid #d0e8f0;
	color: #6a8090;
	font-size: 0.8rem;
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.3s ease;
}

.toc-link.toc-top.visible {
	opacity: 1;
	pointer-events: auto;
}

.toc-link.toc-top:hover {
	color: #1a7dbb;
	background: #e8f4fb;
	border-left-color: #1f9bea;
	border-top-color: #d0e8f0;
}

@media (max-width: 680px) {
	.overview-layout { flex-direction: column; }
	.overview-toc {
		position: static;
		width: 100%;
		flex-direction: row;
		flex-wrap: wrap;
		border-left: none;
		border-bottom: 1px solid #d0e8f0;
		padding: 0.65rem 1rem;
		gap: 0.25rem;
	}
	.toc-label { padding-bottom: 0; align-self: center; }
	.toc-link { border-left: none; border-radius: 999px; }
}

/* ── Tab nav ── */
.tab-nav {
	display: flex;
	gap: 0;
	background: #fff;
	border-bottom: 2px solid #c8dfe8;
	padding: 0 1.5rem;
	overflow-x: auto;
	justify-content: center;
}

.tab-btn {
	background: none;
	border: none;
	border-bottom: 3px solid transparent;
	margin-bottom: -2px;
	padding: 1rem 1.25rem;
	font-size: 0.95rem;
	font-weight: 600;
	color: #5a7080;
	cursor: pointer;
	white-space: nowrap;
	transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover { color: #0d7fa5; }

.tab-btn.active {
	color: #0a4f6e;
	border-bottom-color: #0d7fa5;
}

.tab-btn-external {
	text-decoration: none;
	opacity: 0.8;
}
.tab-btn-external:hover {
	opacity: 1;
	border-bottom-color: transparent;
}

/* ── Tab panels ── */
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Leaderboard placeholder ── */
.leaderboard-meta {
	display: flex;
	flex-wrap: wrap;
	gap: 1rem;
	margin: 1rem 0;
	font-size: 0.9rem;
	color: #4a6070;
}

.lb-note {
	color: #7a90a0;
	font-style: italic;
}

.lb-placeholder {
	margin-top: 2rem;
	border: 2px dashed #c8dfe8;
	border-radius: 12px;
	padding: 3rem 1rem;
	text-align: center;
	color: #7a90a0;
}

.lb-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }

/* ── Submission schema table ── */
.download-template {
	display: inline-flex;
	align-items: center;
	gap: 0.35rem;
	margin: 0.6rem 0 0.85rem;
	padding: 0.4rem 0.85rem;
	border: 1.5px solid #1f9bea;
	border-radius: 6px;
	font-size: 0.875rem;
	font-weight: 600;
	color: #1a7dbb;
	background: #f0f8fe;
	text-decoration: none;
}

.download-template:hover {
	background: #def0fc;
	text-decoration: none;
}

.schema-table {
	width: 100%;
	border-collapse: collapse;
	margin-top: 0.75rem;
	font-size: 0.9rem;
}

.schema-table th {
	text-align: left;
	background: #e4f0f6;
	color: #0a4f6e;
	padding: 0.5rem 0.75rem;
	border: 1px solid #c8dfe8;
}

.schema-table td {
	padding: 0.45rem 0.75rem;
	border: 1px solid #dde8ee;
	color: #3a4f60;
	vertical-align: top;
}

.schema-table tr:nth-child(even) td { background: #f5f9fb; }

/* ── Sub-headings inside tabs ── */
.sub-heading {
	font-size: 1.15rem;
	font-weight: 700;
	color: #0a4f6e;
	margin: 1.5rem 0 0.75rem;
	padding-bottom: 0.3rem;
	border-bottom: 2px solid #c8dfe8;
}

/* ── FAQ accordion ── */
.faq-list {
	margin-top: 1.25rem;
	display: flex;
	flex-direction: column;
	gap: 0.6rem;
}

.faq-item {
	border: 1px solid #c8dfe8;
	border-radius: 10px;
	background: #fff;
	overflow: hidden;
}

.faq-item summary {
	padding: 1rem 1.1rem;
	font-weight: 600;
	color: #0a4f6e;
	cursor: pointer;
	list-style: none;
	display: flex;
	justify-content: space-between;
	align-items: center;
	user-select: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
	content: '+';
	font-size: 1.2rem;
	color: #0d7fa5;
	flex-shrink: 0;
	margin-left: 1rem;
}

.faq-item[open] summary::after { content: '−'; }

.faq-item p {
	padding: 0 1.1rem 1rem;
	margin: 0;
	color: #3a4f60;
	font-size: 0.95rem;
	border-top: 1px solid #e4f0f6;
}

/* ── Community tab ── */
.community-channels {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
	gap: 1.25rem;
	margin-top: 1.5rem;
}

.community-channels .info-card {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
}

.community-channels .info-card p {
	flex: 1;
}

.community-guidelines {
	margin-top: 2.5rem;
	background: #e8f4fa;
	border: 1px solid #c8dfe8;
	border-radius: 12px;
	padding: 1.5rem;
}

.community-guidelines h3 {
	font-size: 1rem;
	font-weight: 700;
	color: #0a4f6e;
	margin-bottom: 0.75rem;
}

.community-guidelines ul {
	padding-left: 1.25rem;
	display: flex;
	flex-direction: column;
	gap: 0.4rem;
	font-size: 0.93rem;
	color: #3a4f60;
}

/* ── Rules list ── */
.rules-list {
	padding-left: 1.25rem;
	display: flex;
	flex-direction: column;
	gap: 0.6rem;
	font-size: 0.95rem;
	color: #3a4f60;
	margin-bottom: 1.5rem;
}

.rules-list li {
	line-height: 1.6;
}

/* ── Footer ── */
footer {
	background: #0a4f6e;
	color: rgba(255,255,255,0.7);
	padding: 1.5rem 0;
	text-align: center;
	font-size: 0.88rem;
}

footer a { color: rgba(255,255,255,0.85); }
footer a:hover { color: #fff; }

.footer-credit {
	margin-top: 0.4rem;
	font-size: 0.82rem;
	color: rgba(255,255,255,0.5);
}

.footer-credit a { color: rgba(255,255,255,0.7); }
.footer-credit a:hover { color: #fff; }


/* ── Sponsor row (hero) ── */
.sponsor-row {
	margin-top: 2rem;
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 0.6rem;
}

.sponsor-row-label {
	font-size: 0.78rem;
	color: rgba(255,255,255,0.6);
	text-transform: uppercase;
	letter-spacing: 0.06em;
}

.sponsor-row-logos {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 2rem;
	flex-wrap: wrap;
	background: rgba(255,255,255,0.92);
	border-radius: 12px;
	padding: 0.85rem 1.5rem;
}

.sponsor-logo {
	height: 30px;
	width: auto;
	max-width: 120px;
	object-fit: contain;
}

/* ── Partners & sponsors section ── */
.partner-card {
	text-align: center;
	display: flex;
	flex-direction: column;
	align-items: center;
}

.partner-logo {
	height: 52px;
	width: auto;
	max-width: 170px;
	object-fit: contain;
	margin-bottom: 0.85rem;
}

/* ── Story section (child's drawing) ── */
.story-container {
	display: flex;
	align-items: flex-start;
	gap: 2.5rem;
	flex-wrap: wrap;
}

.story-text {
	flex: 1 1 480px;
	min-width: 280px;
}

.story-figure {
	flex: 0 0 260px;
	margin: 0;
	text-align: center;
}

.story-drawing {
	width: 100%;
	max-width: 260px;
	height: auto;
	border-radius: 12px;
	border: 1px solid #c8dfe8;
	box-shadow: 0 2px 12px rgba(10, 79, 110, 0.1);
}

.story-figure figcaption {
	margin-top: 0.6rem;
	font-size: 0.8rem;
	color: #7a90a0;
}

@media (max-width: 720px) {
	.story-container { flex-direction: column; }
	.story-figure { order: -1; flex: 0 0 auto; max-width: 220px; margin: 0 auto; }
}
.methods-note {
	margin-left: 3.2rem; /* matches .step-num width (2.2rem) + gap (1rem) so text aligns with step content */
}

@media (max-width: 680px) {
	.methods-note { margin-left: 0; }
}