/*
 * Single Case Study — 1:1 replica of case-detail/index.html + styles.css.
 *
 * Contract (locked by tongyi-automation-theme/assets/js/pages/single-case-study.js):
 *   - Root scope: .case-detail-v3
 *   - Gallery container: [data-case-gallery] with figure > button[data-gallery-open]
 *   - Lightbox: [data-case-lightbox] with data-lightbox-close / prev / next
 *
 * Scope: every selector is nested under .case-detail-v3 to avoid leaking into
 * other single templates. No :root or body rules; no zoom.
 */

.case-detail-v3 {
	--cd-red: var(--c-brand);
	--cd-red-dark: var(--c-brand-dark);
	--cd-red-soft: var(--c-brand-soft);
	--cd-ink: #0e141c;
	--cd-text: #333a44;
	--cd-muted: #737d89;
	--cd-line: #e8ecf0;
	--cd-soft: #f7f9fb;
	--cd-panel: #ffffff;
	--cd-radius: 8px;
	--cd-radius-lg: 12px;
	--cd-shadow-card: 0 4px 20px rgba(16, 24, 35, 0.05);
	--cd-shadow-hero: 0 12px 32px rgba(16, 24, 35, 0.12);
	background: var(--cd-soft);
	color: var(--cd-ink);
	font-family: inherit;
	line-height: var(--line-height-copy);
}

.case-detail-v3 *,
.case-detail-v3 *::before,
.case-detail-v3 *::after { box-sizing: border-box; }

.case-detail-v3 a { color: inherit; text-decoration: none; }

.case-detail-v3 h1,
.case-detail-v3 h2,
.case-detail-v3 h3 {
	margin: 0;
	color: var(--cd-ink);
	letter-spacing: -0.01em;
	line-height: var(--line-height-heading);
}

.case-detail-v3 img { display: block; max-width: 100%; }
.case-detail-v3 button { font: inherit; cursor: pointer; }

.case-detail-v3 .case-shell {
	width: min(calc(100% - 48px), 1280px);
	margin-inline: auto;
}

.case-detail-v3 :focus-visible {
	outline: 2px solid var(--cd-red);
	outline-offset: 2px;
}

.case-detail-eyebrow {
	margin: 0 0 10px;
	color: var(--cd-red);
	font-size: var(--font-size-caption);
	font-weight: var(--font-weight-heading);
	line-height: var(--line-height-heading);
	letter-spacing: 0.14em;
	text-transform: uppercase;
}

/* ------------------------------------------------------------------
 * Hero
 * ---------------------------------------------------------------- */

.case-detail-hero {
	padding-block: 28px 24px;
	background: var(--cd-soft);
}

.case-detail-hero__grid {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1.24fr);
	gap: 42px;
	align-items: stretch;
}

.case-detail-hero__copy {
	display: flex;
	flex-direction: column;
	padding-top: 8px;
}

.case-detail-hero h1 {
	max-width: 460px;
	font-size: var(--font-size-h1);
	font-weight: var(--font-weight-heading);
	line-height: var(--line-height-display);
	letter-spacing: -0.02em;
}

.case-detail-lead {
	max-width: 460px;
	margin: 16px 0 0;
	color: var(--cd-text);
	font-size: var(--font-size-small);
	line-height: var(--line-height-base);
}

.case-detail-facts {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 10px 12px;
	margin: 26px 0 0;
	padding: 0;
}

.case-detail-facts > div {
	position: relative;
	min-width: 0;
	padding-left: 30px;
}

.case-detail-facts svg {
	position: absolute;
	top: 2px;
	left: 0;
	width: 20px;
	height: 20px;
	color: var(--cd-red);
	stroke-width: 1.75;
}

.case-detail-facts dt {
	margin: 0;
	color: var(--cd-ink);
	font-size: var(--font-size-caption);
	font-weight: var(--font-weight-heading);
	line-height: var(--line-height-heading);
}

.case-detail-facts dd {
	margin: 3px 0 0;
	color: var(--cd-muted);
	font-size: var(--font-size-caption);
	line-height: var(--line-height-heading);
}

.case-detail-actions {
	margin-top: auto;
	padding-top: 30px;
}

.case-button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	min-height: 44px;
	padding: 0 22px;
	border: 1px solid transparent;
	border-radius: 4px;
	font-size: var(--font-size-small);
	font-weight: var(--font-weight-bold);
	transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.case-button svg { width: 14px; height: 14px; }

.case-detail-v3 .case-button--primary {
	color: #fff;
	background: var(--cd-red);
	border-color: var(--cd-red);
	box-shadow: 0 8px 20px rgba(237, 28, 46, 0.24);
}

.case-detail-v3 .case-button--primary:hover,
.case-detail-v3 .case-button--primary:focus-visible {
	background: var(--cd-red-dark);
	border-color: var(--cd-red-dark);
}

.case-detail-hero__media {
	position: relative;
	min-height: 420px;
	aspect-ratio: auto;
	margin: 0;
	overflow: hidden;
	border-radius: var(--cd-radius-lg);
	box-shadow: var(--cd-shadow-hero);
	background: #eef1f4;
}

.case-detail-hero__media img {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	object-fit: cover;
}

/* ------------------------------------------------------------------
 * Body scaffold
 * ---------------------------------------------------------------- */

.case-detail-body {
	padding-block: 16px 12px;
}

.case-detail-section {
	margin-top: 40px;
}

.case-detail-section:first-child { margin-top: 0; }

.case-detail-section__heading {
	max-width: 780px;
	margin-bottom: 20px;
}

.case-detail-section h2,
.case-detail-panel h2 {
	font-size: var(--font-size-h3);
	font-weight: var(--font-weight-heading);
	line-height: var(--line-height-heading);
	letter-spacing: -0.015em;
}

.case-detail-section__lead {
	margin: 10px 0 0;
	color: var(--cd-muted);
	font-size: var(--font-size-small);
	line-height: var(--line-height-copy);
}

/* ------------------------------------------------------------------
 * Overview (Client + Highlights)
 * ---------------------------------------------------------------- */

.case-detail-overview { margin-top: 0; }

.case-detail-overview__grid {
	display: grid;
	grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
	gap: 20px;
	align-items: stretch;
}

.case-detail-panel {
	background: var(--cd-panel);
	border: 1px solid var(--cd-line);
	border-radius: var(--cd-radius);
	padding: 26px 28px;
	box-shadow: var(--cd-shadow-card);
}

.case-detail-panel h2 {
	margin: 4px 0 12px;
	font-size: var(--font-size-h4);
	line-height: var(--line-height-heading);
}

.case-detail-panel__lead {
	margin: 0 0 18px;
	color: var(--cd-text);
	font-size: var(--font-size-small);
	line-height: var(--line-height-base);
}

.case-detail-facts-table {
	width: 100%;
	border-collapse: collapse;
	color: var(--cd-ink);
	font-size: var(--font-size-caption);
}

.case-detail-facts-table tr { border-top: 1px solid var(--cd-line); }
.case-detail-facts-table tr:last-child { border-bottom: 1px solid var(--cd-line); }

.case-detail-facts-table th {
	width: 38%;
	padding: 10px 6px 10px 0;
	color: var(--cd-muted);
	font-weight: var(--font-weight-medium);
	text-align: left;
}

.case-detail-facts-table td {
	padding: 10px 0 10px 6px;
	color: var(--cd-ink);
	font-weight: var(--font-weight-bold);
}

.case-detail-challenge {
	margin-top: 18px;
	padding-top: 16px;
	border-top: 1px solid var(--cd-line);
}

.case-detail-challenge h3 {
	margin: 0 0 8px;
	color: var(--cd-muted);
	font-size: var(--font-size-caption);
	font-weight: var(--font-weight-medium);
	line-height: var(--line-height-heading);
}

.case-detail-challenge p {
	margin: 0;
	color: var(--cd-text);
	font-size: var(--font-size-small);
	font-weight: var(--font-weight-regular);
	line-height: var(--line-height-copy);
}

.case-detail-panel--highlights {
	display: flex;
	flex-direction: column;
}

.case-detail-checks {
	display: grid;
	flex: 1;
	grid-auto-rows: minmax(44px, 1fr);
	gap: 14px;
	margin: 6px 0 0;
	padding: 0;
	list-style: none;
	color: var(--cd-text);
	font-size: var(--font-size-small);
	line-height: var(--line-height-copy);
}

.case-detail-checks li {
	display: flex;
	align-items: center;
	gap: 10px;
	padding-block: 8px;
	border-top: 1px solid var(--cd-line);
}

.case-detail-checks svg {
	flex: 0 0 16px;
	width: 16px;
	height: 16px;
	color: var(--cd-red);
	stroke-width: 3;
}

/* ------------------------------------------------------------------
 * Solution overview: five-step flow
 * ---------------------------------------------------------------- */

.case-detail-flow {
	display: grid;
	grid-template-columns: repeat(5, minmax(0, 1fr));
	gap: 14px;
	margin: 4px 0 0;
	padding: 0;
	list-style: none;
}

.case-detail-flow__step {
	position: relative;
	min-height: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: flex-start;
	padding: 18px 16px 16px;
	background: var(--cd-panel);
	border: 1px solid var(--cd-line);
	border-radius: var(--cd-radius);
	box-shadow: var(--cd-shadow-card);
	text-align: center;
}

.case-detail-flow__step:not(:last-child)::after {
	content: "→";
	position: absolute;
	z-index: 2;
	top: 50%;
	right: -14px;
	transform: translateY(-50%);
	color: var(--cd-red);
	font-size: var(--font-size-h3);
	font-weight: var(--font-weight-heading);
	line-height: var(--line-height-display);
}

.case-detail-flow__badge {
	position: absolute;
	top: -12px;
	left: 50%;
	width: 24px;
	height: 24px;
	display: grid;
	place-items: center;
	transform: translateX(-50%);
	color: var(--cd-red);
	background: #fff;
	border: 1.5px solid var(--cd-red);
	border-radius: 50%;
	font-size: 12px;
	font-weight: var(--font-weight-heading);
	line-height: var(--line-height-display);
}

.case-detail-flow__thumb {
	flex: 0 0 auto;
	width: 100%;
	min-height: 0;
	overflow: hidden;
	background: #eef1f4;
	border-radius: 4px;
	aspect-ratio: 4 / 3;
}

.case-detail-flow__thumb img {
	width: 100%;
	height: 100%;
	max-height: none;
	object-fit: cover;
	mix-blend-mode: normal;
}

html body.single-case main#main-content.case-detail-v3 .case-detail-flow .case-detail-flow__step h3 {
	flex: 1;
	display: flex;
	align-items: center;
	justify-content: center;
	min-height: 44px;
	margin: 14px 0 0;
	color: var(--cd-ink);
	font-size: 18px !important;
	font-weight: var(--font-weight-bold);
	line-height: 1.35 !important;
	letter-spacing: 0 !important;
}

/* ------------------------------------------------------------------
 * Project Outcomes (4 tiles)
 * ---------------------------------------------------------------- */

.case-detail-outcomes {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 14px;
}

.case-detail-outcome {
	display: grid;
	grid-template-columns: 44px minmax(0, 1fr);
	gap: 14px;
	padding: 20px 20px 18px;
	background: var(--cd-panel);
	border: 1px solid var(--cd-line);
	border-radius: var(--cd-radius);
	box-shadow: var(--cd-shadow-card);
}

.case-detail-outcome__icon {
	width: 40px;
	height: 40px;
	display: grid;
	place-items: center;
	color: var(--cd-red);
	background: var(--cd-red-soft);
	border-radius: 50%;
}

.case-detail-outcome__icon svg {
	width: 20px;
	height: 20px;
	stroke-width: 1.75;
}

.case-detail-outcome__body strong {
	display: block;
	margin: -2px 0 4px;
	color: var(--cd-red);
	font-size: var(--font-size-h2);
	font-weight: var(--font-weight-heading);
	line-height: var(--line-height-display);
	letter-spacing: -0.02em;
	font-variant-numeric: tabular-nums;
}

.case-detail-outcome__body h3 {
	margin: 4px 0 6px;
	color: var(--cd-ink);
	font-size: var(--font-size-small);
	font-weight: var(--font-weight-bold);
	line-height: var(--line-height-heading);
}

.case-detail-outcome__body p {
	margin: 0;
	color: var(--cd-muted);
	font-size: var(--font-size-caption);
	line-height: var(--line-height-copy);
}

/* ------------------------------------------------------------------
 * Gallery (4 tiles, last one may carry the play button)
 * ---------------------------------------------------------------- */

.case-detail-gallery {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 14px;
}

.case-detail-gallery__item {
	margin: 0;
	min-width: 0;
}

.case-detail-gallery__item button {
	position: relative;
	display: block;
	width: 100%;
	padding: 0;
	overflow: hidden;
	background: #e9edf1;
	border: 0;
	border-radius: var(--cd-radius);
	cursor: zoom-in;
	aspect-ratio: 4 / 3;
}

.case-detail-gallery__item img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.25s ease;
}

.case-detail-gallery__item button:hover img,
.case-detail-gallery__item button:focus-visible img {
	transform: scale(1.03);
}

.case-detail-gallery__play {
	position: absolute;
	top: 50%;
	left: 50%;
	width: 52px;
	height: 52px;
	display: grid;
	place-items: center;
	transform: translate(-50%, -50%);
	color: var(--cd-red);
	background: #fff;
	border: 1.5px solid rgba(237, 28, 46, 0.55);
	border-radius: 50%;
	box-shadow: 0 8px 22px rgba(15, 23, 33, 0.18);
	pointer-events: none;
}

.case-detail-gallery__play svg {
	width: 20px;
	height: 20px;
	margin-left: 3px;
}

.case-detail-gallery__item figcaption {
	padding-top: 10px;
	color: var(--cd-ink);
	font-size: var(--font-size-caption);
	font-weight: var(--font-weight-bold);
	line-height: var(--line-height-tight);
	text-align: center;
}

.case-detail-gallery__item figcaption span {
	display: block;
	margin-top: 2px;
	color: var(--cd-muted);
	font-size: var(--font-size-caption);
	font-weight: var(--font-weight-regular);
}

/* ------------------------------------------------------------------
 * Evidence grid: Customer Feedback + Related Documents
 * ---------------------------------------------------------------- */

.case-detail-evidence {
	margin-top: 40px;
}

.case-detail-evidence__grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 20px;
	align-items: stretch;
}

.case-detail-panel--testimonial blockquote {
	margin: 6px 0 0;
	padding-left: 14px;
	border-left: 3px solid var(--cd-red);
}

.case-detail-panel--testimonial blockquote p {
	margin: 0 0 14px;
	color: var(--cd-text);
	font-size: var(--font-size-small);
	line-height: var(--line-height-relaxed);
}

.case-detail-panel--testimonial footer {
	margin: 0;
}

.case-detail-panel--testimonial footer strong {
	display: block;
	color: var(--cd-ink);
	font-size: var(--font-size-caption);
	font-weight: var(--font-weight-heading);
}

.case-detail-panel--testimonial footer span {
	display: block;
	margin-top: 2px;
	color: var(--cd-muted);
	font-size: var(--font-size-caption);
}

.case-detail-documents {
	display: grid;
	gap: 12px;
	margin: 6px 0 0;
	padding: 0;
	list-style: none;
	color: var(--cd-text);
	font-size: var(--font-size-caption);
}

.case-detail-documents li {
	display: flex;
	align-items: center;
	gap: 10px;
}

.case-detail-documents svg {
	flex: 0 0 16px;
	width: 16px;
	height: 16px;
	color: var(--cd-red);
	stroke-width: 1.75;
}

.case-detail-documents a {
	color: var(--cd-ink);
	font-weight: var(--font-weight-medium);
	text-decoration: none;
	transition: color 0.18s ease;
}

.case-detail-documents a:hover,
.case-detail-documents a:focus-visible {
	color: var(--cd-red);
	text-decoration: underline;
	text-underline-offset: 3px;
}

.case-detail-documents__meta {
	margin-left: 4px;
	color: var(--cd-muted);
	font-size: var(--font-size-caption);
	font-weight: var(--font-weight-regular);
}

.case-detail-v3 .case-detail-download-all {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	margin-top: 18px;
	padding: 0 18px;
	min-height: 38px;
	color: var(--cd-red);
	background: #fff;
	border: 1px solid var(--cd-red);
	border-radius: 4px;
	font-size: var(--font-size-caption);
	font-weight: var(--font-weight-bold);
	transition: background 0.18s ease, color 0.18s ease;
}

.case-detail-download-all svg { width: 14px; height: 14px; }

.case-detail-v3 .case-detail-download-all:hover,
.case-detail-v3 .case-detail-download-all:focus-visible {
	color: #fff;
	background: var(--cd-red);
}

/* ------------------------------------------------------------------
 * Project FAQ
 * ---------------------------------------------------------------- */

.case-detail-faq__list {
	overflow: hidden;
	background: var(--cd-panel);
	border: 1px solid var(--cd-line);
	border-radius: var(--cd-radius);
	box-shadow: var(--cd-shadow-card);
}

.case-detail-faq details + details {
	border-top: 1px solid var(--cd-line);
}

.case-detail-faq summary {
	display: grid;
	grid-template-columns: minmax(0, 1fr) 20px;
	align-items: center;
	gap: 20px;
	padding: 19px 22px;
	color: var(--cd-ink);
	font-size: var(--font-size-small);
	font-weight: var(--font-weight-bold);
	line-height: var(--line-height-heading);
	list-style: none;
	cursor: pointer;
}

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

.case-detail-faq summary svg {
	width: 18px;
	height: 18px;
	color: var(--cd-red);
	transition: transform 0.18s ease;
}

.case-detail-faq details[open] summary svg {
	transform: rotate(180deg);
}

.case-detail-faq__answer {
	padding: 0 60px 20px 22px;
	color: var(--cd-text);
	font-size: var(--font-size-small);
	line-height: var(--line-height-copy);
}

.case-detail-faq__answer > :first-child { margin-top: 0; }
.case-detail-faq__answer > :last-child { margin-bottom: 0; }

/* Shared closing CTA placement. */

.case-detail-closing {
	padding-block: 26px 40px;
}

/* ------------------------------------------------------------------
 * Lightbox (retained JS contract selectors)
 * ---------------------------------------------------------------- */

.case-detail-v3 .case-lightbox {
	position: fixed;
	z-index: 100000;
	inset: 0;
	display: grid;
	grid-template-columns: 60px minmax(0, 1100px) 60px;
	align-items: center;
	justify-content: center;
	gap: 12px;
	padding: 45px;
	background: rgba(5, 9, 14, 0.94);
}

.case-detail-v3 .case-lightbox[hidden] { display: none; }
.case-detail-v3 .case-lightbox figure { margin: 0; }

.case-detail-v3 .case-lightbox img {
	display: block;
	max-width: 100%;
	max-height: 80vh;
	margin: auto;
}

.case-detail-v3 .case-lightbox figcaption {
	margin-top: 12px;
	color: #fff;
	text-align: center;
}

.case-detail-v3 .case-lightbox button {
	display: grid;
	width: 48px;
	height: 48px;
	place-items: center;
	border: 0;
	border-radius: 50%;
	color: #fff;
	background: rgba(255, 255, 255, 0.14);
}

.case-detail-v3 .case-lightbox > [data-lightbox-close] {
	position: absolute;
	top: 20px;
	right: 20px;
}

.case-detail-v3 .case-lightbox svg { width: 22px; height: 22px; }

/* ------------------------------------------------------------------
 * Responsive
 * ---------------------------------------------------------------- */

@media (max-width: 1200px) {
	.case-detail-facts {
		grid-template-columns: repeat(2, minmax(0, 1fr));
		gap: 14px 20px;
	}
}

@media (max-width: 1366px) {
	.case-detail-hero__grid {
		grid-template-columns: minmax(0, 1fr);
		gap: 0;
		align-items: start;
	}
	.case-detail-hero__copy { display: contents; }
	.case-detail-hero__copy .case-detail-eyebrow { order: 1; }
	.case-detail-hero h1 {
		order: 2;
		max-width: 900px;
	}
	.case-detail-hero__media {
		order: 3;
		min-height: 0;
		margin-top: 24px;
		aspect-ratio: 488 / 294;
	}
	.case-detail-lead {
		order: 4;
		max-width: 760px;
		margin-top: 20px;
	}
	.case-detail-facts { order: 5; }
	.case-detail-actions {
		order: 6;
		margin-top: 30px;
		padding-top: 0;
	}
}

@media (max-width: 1080px) {
	.case-detail-overview__grid,
	.case-detail-evidence__grid { grid-template-columns: 1fr; }
	html body.single-case main#main-content.case-detail-v3 .case-detail-overview__grid {
		grid-auto-rows: auto !important;
		align-items: start;
	}
	html body.single-case main#main-content.case-detail-v3 .case-detail-overview__grid .case-detail-panel {
		height: auto;
	}
	.case-detail-flow { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 40px; }
	.case-detail-flow__step:nth-child(3n)::after { display: none; }
	.case-detail-outcomes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.case-detail-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 800px) {
	.case-detail-hero {
		padding-block: 24px;
	}
	.case-detail-hero__grid {
		grid-template-columns: minmax(0, 1fr);
		gap: 0;
	}
	.case-detail-hero h1 { font-size: var(--font-size-h2); }
	.case-detail-lead { font-size: var(--font-size-body); }
	.case-detail-facts > div {
		min-height: 40px;
		padding-left: 32px;
	}
	.case-detail-facts svg {
		width: 22px;
		height: 22px;
	}
}

@media (max-width: 760px) {
	.case-detail-v3 .case-shell {
		width: min(calc(100% - 32px), 1280px);
	}
	.case-detail-panel { padding: 22px 20px; }
	.case-detail-faq summary { padding-inline: 20px; }
	.case-detail-faq__answer { padding: 0 48px 18px 20px; }
	.case-detail-flow {
		grid-template-columns: repeat(2, minmax(0, 1fr));
		row-gap: 40px;
	}
	.case-detail-flow__step::after { display: none !important; }
	.case-detail-outcomes { grid-template-columns: 1fr; }
	.case-detail-outcome { grid-template-columns: 40px 1fr; }
	.case-detail-outcome__body strong { font-size: var(--font-size-h3); }
	.case-detail-gallery { grid-template-columns: 1fr; gap: 12px; }
	.case-detail-v3 .case-lightbox {
		grid-template-columns: 45px 1fr 45px;
		gap: 6px;
		padding: 28px 10px;
	}
	.case-detail-v3 .case-lightbox button { width: 42px; height: 42px; }
}

@media (max-width: 480px) {
	.case-detail-facts,
	.case-detail-flow { grid-template-columns: 1fr; }
	.case-detail-flow { row-gap: 32px; }
	.case-detail-flow__step {
		display: grid;
		grid-template-columns: minmax(96px, 0.85fr) minmax(0, 1.15fr);
		gap: 16px;
		align-items: center;
		min-height: 120px;
		padding: 18px 16px 16px;
		text-align: left;
	}
	.case-detail-flow__step h3 {
		min-height: 0;
		margin: 0;
		justify-content: flex-start;
		text-align: left;
	}
	.case-detail-hero h1 { font-size: var(--font-size-h2); }
}

@media (prefers-reduced-motion: reduce) {
	.case-detail-gallery__item img,
	.case-detail-faq summary svg,
	.case-button { transition: none; }
}