/**
 * Mining / oil / stormwater — same layout, theme colours, photos + FAQ.
 */

.csu-wrap {
	--ink: #1a1f1b;
	--mute: #536057;
	--accent: #c4a574;
	--leaf: #2f6b32;
	--band: #efe6d6;
	--paper: #f7f1e6;
	--deep: #3a2a18;
	width: 100%;
	background: var(--paper);
	color: var(--ink);
}

.csu-theme-agriculture {
	--band: #eaf4eb;
	--paper: #f4f8f4;
	--deep: #061d10;
	--accent: #3da83b;
	--leaf: #2e7d32;
}

.csu-theme-industry {
	--band: #eef2f6;
	--paper: #f8fafc;
	--deep: #0f172a;
	--accent: #3b82f6;
	--leaf: #1e3a8a;
}

.csu-theme-water_filtration {
	--band: #dcfce7;
	--paper: #f0fdf4;
	--deep: #042f2e;
	--accent: #14b8a6;
	--leaf: #0f766e;
}

.csu-theme-renewable_energy {
	--band: #fef3c7;
	--paper: #fffbeb;
	--deep: #451a03;
	--accent: #f59e0b;
	--leaf: #b45309;
}

.csu-theme-carbon_removal {
	--band: #ede9fe;
	--paper: #f5f3ff;
	--deep: #2e1065;
	--accent: #8b5cf6;
	--leaf: #6d28d9;
}

.csu-theme-circular_enterprises {
	--band: #f5f5f4;
	--paper: #fafaf9;
	--deep: #1c1917;
	--accent: #14b8a6;
	--leaf: #0f766e;
}

.csu-theme-hydrocarbons {
	--band: #eadfd0;
	--paper: #f4eee6;
	--deep: #2a2118;
	--accent: #b8895a;
}

.csu-theme-stormwater {
	--band: #d7e4df;
	--paper: #eef4f1;
	--deep: #0d2a24;
	--accent: #3a8f7a;
	--leaf: #1f6b58;
}

.csu-inner {
	width: 90vw;
	max-width: 90vw;
	margin: 0 auto;
	padding: 72px 0;
	box-sizing: border-box;
}

.csu-kicker {
	margin: 0 0 12px;
	font-family: 'Inter', sans-serif;
	font-size: 12px;
	font-weight: 800;
	letter-spacing: 0.2em;
	text-transform: uppercase;
	color: var(--leaf);
}

.csu-h2 {
	margin: 0 0 16px;
	font-family: 'Outfit', sans-serif;
	font-size: clamp(28px, 3.4vw, 40px);
	font-weight: 700;
	line-height: 1.15;
	letter-spacing: -0.03em;
	max-width: 16ch;
}

.csu-lead {
	margin: 0;
	max-width: 52ch;
	font-family: 'Inter', sans-serif;
	font-size: 17px;
	line-height: 1.65;
	color: var(--mute);
}

.csu-intro {
	background: var(--paper);
}

.csu-intro-grid {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
	gap: 40px;
	align-items: center;
}

.csu-photo,
.csu-card-photo,
.csu-use-photo {
	min-height: 280px;
	background: #2a241c center 36% / 122% auto no-repeat;
	border-radius: 12px;
	overflow: hidden;
}

.csu-photo {
	min-height: 380px;
	box-shadow: 0 18px 40px rgba(20, 16, 10, 0.12);
}

.csu-need {
	background: var(--band);
}

.csu-need-grid {
	list-style: none;
	margin: 32px 0 0;
	padding: 0;
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 16px;
}

.csu-need-grid li {
	background: #fff;
	border-radius: 12px;
	overflow: hidden;
	border-top: 3px solid var(--accent);
	box-shadow: 0 8px 22px rgba(20, 16, 10, 0.06);
}

.csu-card-photo {
	min-height: 168px;
	border-radius: 0;
	transition: transform 0.45s ease;
}

.csu-need-grid li:hover .csu-card-photo {
	transform: scale(1.04);
}

.csu-card-body {
	padding: 20px 20px 22px;
}

.csu-need-grid h3 {
	margin: 0 0 8px;
	font-family: 'Outfit', sans-serif;
	font-size: 20px;
}

.csu-need-grid p {
	margin: 0;
	font-family: 'Inter', sans-serif;
	font-size: 15px;
	line-height: 1.5;
	color: var(--mute);
}

.csu-use {
	background: var(--deep);
	color: #f3efe8;
}

.csu-use .csu-kicker {
	color: var(--accent);
}

.csu-use .csu-h2 {
	color: #f3efe8;
}

.csu-use-list {
	list-style: none;
	margin: 36px 0 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: 20px;
}

.csu-use-list li {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
	gap: 28px;
	align-items: center;
}

.csu-use-list li.is-flip {
	direction: rtl;
}

.csu-use-list li.is-flip > * {
	direction: ltr;
}

.csu-use-photo {
	min-height: 260px;
	box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}

.csu-use-copy span {
	display: block;
	font-family: 'Outfit', sans-serif;
	font-size: 13px;
	font-weight: 800;
	letter-spacing: 0.12em;
	color: var(--accent);
	margin-bottom: 10px;
}

.csu-use-copy h3 {
	margin: 0 0 8px;
	font-family: 'Outfit', sans-serif;
	font-size: 24px;
}

.csu-use-copy p {
	margin: 0;
	font-family: 'Inter', sans-serif;
	font-size: 15.5px;
	line-height: 1.55;
	color: #d5cdc2;
}

.csu-faq {
	background: var(--paper);
}

.csu-faq-grid {
	display: grid;
	grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
	gap: 48px;
	align-items: start;
}

.csu-faq-head .csu-h2 {
	max-width: 12ch;
}

.csu-faq-list {
	display: flex;
	flex-direction: column;
	gap: 10px;
}

.csu-faq-item {
	background: #fff;
	border: 1px solid #d8d2c6;
	border-radius: 12px;
	padding: 0;
	overflow: hidden;
	transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.csu-faq-item[open] {
	border-color: var(--accent);
	box-shadow: 0 10px 24px rgba(20, 16, 10, 0.07);
}

.csu-faq-item summary {
	list-style: none;
	cursor: pointer;
	padding: 18px 20px;
	font-family: 'Outfit', sans-serif;
	font-size: 17px;
	font-weight: 700;
	line-height: 1.3;
	display: grid;
	grid-template-columns: auto 1fr auto;
	align-items: center;
	gap: 14px;
}

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

.csu-faq-num {
	font-size: 13px;
	letter-spacing: 0.08em;
	color: var(--accent);
	font-weight: 800;
}

.csu-faq-q {
	min-width: 0;
}

.csu-faq-item summary::after {
	content: '+';
	width: 28px;
	height: 28px;
	border-radius: 50%;
	border: 1px solid #d8d2c6;
	color: var(--accent);
	font-size: 18px;
	font-weight: 500;
	line-height: 26px;
	text-align: center;
	flex-shrink: 0;
}

.csu-faq-item[open] summary::after {
	content: '–';
	background: var(--accent);
	border-color: var(--accent);
	color: #fff;
}

.csu-faq-item p {
	margin: 0;
	padding: 0 20px 20px 52px;
	font-family: 'Inter', sans-serif;
	font-size: 15.5px;
	line-height: 1.65;
	color: var(--mute);
	max-width: 62ch;
}

.csu-close {
	background: var(--band);
}

.csu-close-row {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 40px;
}

.csu-btn {
	display: inline-flex;
	align-items: center;
	padding: 14px 22px;
	background: #3da83b;
	color: #061d10 !important;
	font-family: 'Outfit', sans-serif;
	font-weight: 700;
	text-decoration: none !important;
	border-radius: 8px;
	white-space: nowrap;
	flex-shrink: 0;
}

.csu-btn:hover {
	filter: brightness(0.95);
}

/* Pipeline Flow Bar */
.csu-approach-strip {
	background: rgba(61, 168, 59, 0.04);
	border-top: 1px solid rgba(61, 168, 59, 0.15);
	border-bottom: 1px solid rgba(61, 168, 59, 0.15);
}

.csu-pipeline-flow {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	flex-wrap: wrap;
	margin-top: 20px;
}

.csu-pipe-step {
	flex: 1;
	min-width: 140px;
	background: #ffffff;
	border: 1px solid rgba(61, 168, 59, 0.2);
	border-radius: 14px;
	padding: 18px 16px;
	display: flex;
	flex-direction: column;
	gap: 6px;
	box-shadow: 0 4px 15px rgba(61, 168, 59, 0.05);
	transition: all 0.3s ease;
}

.csu-pipe-step.csu-pipe-active {
	border-color: #3da83b;
	background: #edf7ef;
	box-shadow: 0 6px 20px rgba(61, 168, 59, 0.15);
}

.csu-pipe-num {
	font-family: 'Inter', sans-serif;
	font-size: 11px;
	font-weight: 800;
	letter-spacing: 0.12em;
	color: #2e7d32;
}

.csu-pipe-title {
	font-family: 'Outfit', sans-serif;
	font-size: 14.5px;
	font-weight: 700;
	color: #061d10;
	line-height: 1.25;
}

.csu-pipe-arrow {
	font-size: 18px;
	font-weight: 700;
	color: #3da83b;
	flex-shrink: 0;
}

@media (max-width: 900px) {
	.csu-intro-grid,
	.csu-need-grid,
	.csu-faq-grid,
	.csu-use-list li,
	.csu-use-list li.is-flip {
		grid-template-columns: 1fr;
		direction: ltr;
	}

	.csu-photo {
		min-height: 240px;
		order: -1;
	}

	.csu-close-row {
		flex-direction: column;
		align-items: flex-start;
	}

	.csu-pipeline-flow {
		flex-direction: column;
		align-items: stretch;
	}

	.csu-pipe-arrow {
		transform: rotate(90deg);
		align-self: center;
	}
}