/* ══════════════════════════════════════════════════════════════
   Zhanchao Yang — Research Proposal pages
   Extends home.css. Each proposal page carries a theme accent:
   perception pages lean sage (see design.md research categories).
══════════════════════════════════════════════════════════════ */

body.proposal {
	background: var(--bg);
	color: var(--ink);
	font-family: var(--sans);
	font-size: 16px;
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
	overflow-x: hidden;
}

/* theme accent — deep sage that stays readable on ivory */
body.theme-perception {
	--accent: #53775b;
	--accent-soft: var(--sage);
	--accent-mid: var(--sage-deep);
}

/* section labels pick up the page accent instead of red */
.proposal .section-label {
	color: var(--accent);
}
.proposal .section-label::before {
	background: var(--accent);
}

/* ── Proposal hero ────────────────────────────────────────── */
.p-hero {
	position: relative;
	padding: 158px 0 84px;
	overflow: hidden;
}

/* faint city map drifting behind the right column */
.p-hero-map {
	position: absolute;
	top: -10%;
	bottom: -10%;
	right: -6%;
	width: 62%;
	opacity: 0.5;
	pointer-events: none;
	-webkit-mask-image: radial-gradient(
		ellipse 75% 80% at 62% 45%,
		rgba(0, 0, 0, 1) 40%,
		rgba(0, 0, 0, 0) 82%
	);
	mask-image: radial-gradient(
		ellipse 75% 80% at 62% 45%,
		rgba(0, 0, 0, 1) 40%,
		rgba(0, 0, 0, 0) 82%
	);
}
.p-hero-map img {
	position: absolute;
	left: 50%;
	top: 50%;
	width: 150%;
	height: auto;
	transform: translate(-50%, -50%);
}
.p-hero-scrim {
	position: absolute;
	inset: 0;
	z-index: 1;
	pointer-events: none;
	background: linear-gradient(
		100deg,
		var(--bg) 0%,
		var(--bg) 30%,
		rgba(250, 248, 244, 0.7) 55%,
		rgba(250, 248, 244, 0.15) 80%
	);
}

.p-hero-content {
	position: relative;
	z-index: 2;
	max-width: 660px;
}

.p-crumb {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	font-size: 0.78rem;
	font-weight: 500;
	letter-spacing: 0.06em;
	color: var(--ink-faint);
	text-decoration: none;
	margin-bottom: 30px;
	transition: color 0.25s ease;
}
.p-crumb .arrow {
	transition: transform 0.3s ease;
}
.p-crumb:hover {
	color: var(--red);
}
.p-crumb:hover .arrow {
	transform: translateX(-3px);
}

.p-eyebrow {
	font-size: 0.78rem;
	font-weight: 600;
	letter-spacing: 0.17em;
	text-transform: uppercase;
	color: var(--accent);
	margin-bottom: 22px;
	display: flex;
	align-items: center;
	gap: 12px;
	flex-wrap: wrap;
}
.p-eyebrow::before {
	content: '';
	width: 30px;
	height: 1.5px;
	background: var(--accent);
}
.p-eyebrow .p-status {
	color: var(--ink);
	background: rgba(128, 153, 181, 0.32);
	border-radius: 100px;
	padding: 4px 13px;
	letter-spacing: 0.12em;
}

.p-hero h1 {
	font-family: var(--serif);
	font-size: clamp(2.5rem, 5.2vw, 3.8rem);
	font-weight: 600;
	line-height: 1.08;
	letter-spacing: -0.015em;
	margin-bottom: 24px;
	max-width: 560px;
}
.p-dek {
	font-family: var(--serif);
	font-size: clamp(1.14rem, 2vw, 1.3rem);
	line-height: 1.6;
	color: var(--ink-soft);
	max-width: 540px;
	margin-bottom: 26px;
}
.p-dek em {
	font-style: italic;
	color: var(--ink);
}
.p-lede {
	font-size: 0.98rem;
	line-height: 1.7;
	color: var(--ink-soft);
	max-width: 540px;
	margin-bottom: 34px;
}
.p-keywords {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
}
.p-keywords span {
	font-size: 0.73rem;
	font-weight: 500;
	letter-spacing: 0.04em;
	color: var(--ink-soft);
	border: 1px solid var(--line);
	border-radius: 100px;
	padding: 5px 14px;
	background: rgba(255, 255, 255, 0.55);
}

/* concept chips under the hero */
.p-concepts {
	position: relative;
	z-index: 2;
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 28px;
	margin-top: 66px;
	padding-top: 44px;
	border-top: 1px solid var(--line-soft);
}
.p-concept {
	display: flex;
	align-items: flex-start;
	gap: 16px;
}
.p-concept .icon-badge {
	width: 48px;
	height: 48px;
}
.p-concept .icon-badge svg {
	width: 23px;
	height: 23px;
}
.p-concept h3 {
	font-family: var(--serif);
	font-size: 1.04rem;
	font-weight: 600;
	line-height: 1.3;
	margin-bottom: 4px;
}
.p-concept p {
	font-size: 0.84rem;
	line-height: 1.55;
	color: var(--ink-soft);
}

/* ── The Core Idea — two cities compared ──────────────────── */
.compare {
	display: grid;
	grid-template-columns: minmax(0, 1fr) 64px minmax(0, 1fr);
	align-items: stretch;
	gap: 0;
}
.compare-panel {
	background: var(--surface);
	border: 1px solid var(--line-soft);
	border-radius: 6px;
	box-shadow: var(--shadow);
	padding: 32px 32px 26px;
	display: flex;
	flex-direction: column;
}
.compare-panel h3 {
	font-family: var(--serif);
	font-size: 1.35rem;
	font-weight: 600;
	text-align: center;
	margin-bottom: 6px;
}
.compare-panel .compare-sub {
	font-size: 0.86rem;
	color: var(--ink-soft);
	text-align: center;
	margin-bottom: 22px;
}
.compare-fig {
	background: var(--surface-warm);
	border: 1px solid var(--line-soft);
	border-radius: 4px;
	padding: 14px;
	margin-bottom: 20px;
}
.compare-fig svg {
	display: block;
	width: 100%;
	height: auto;
}
.compare-vs {
	align-self: center;
	justify-self: center;
	width: 52px;
	height: 52px;
	border-radius: 50%;
	background: var(--ink);
	color: #fdfcf9;
	font-family: var(--serif);
	font-style: italic;
	font-size: 1.05rem;
	display: flex;
	align-items: center;
	justify-content: center;
	box-shadow: var(--shadow);
	z-index: 1;
}

/* legends */
.legend {
	display: flex;
	flex-wrap: wrap;
	gap: 10px 22px;
	margin-top: auto;
}
.legend li {
	list-style: none;
	display: inline-flex;
	align-items: center;
	gap: 9px;
	font-size: 0.76rem;
	color: var(--ink-soft);
}
.lg-swatch {
	flex-shrink: 0;
	width: 13px;
	height: 13px;
	border-radius: 3px;
}
.lg-line {
	flex-shrink: 0;
	width: 22px;
	height: 0;
	border-top: 2.6px solid currentColor;
	border-radius: 2px;
}
.lg-line.dashed {
	border-top-style: dashed;
}

/* route draws itself when the panel scrolls into view */
.route-draw {
	stroke-dasharray: 720;
	stroke-dashoffset: 720;
}
.compare-panel.in-view .route-draw {
	animation: route-draw 1.9s cubic-bezier(0.3, 0, 0.2, 1) forwards 0.45s;
}
@keyframes route-draw {
	to { stroke-dashoffset: 0; }
}
.route-fade {
	opacity: 0;
	transition: opacity 1.2s ease 0.9s;
}
.compare-panel.in-view .route-fade {
	opacity: 1;
}

/* ── Where the Idea Comes From ────────────────────────────── */
.section-origin {
	background: var(--surface-warm);
	border-top: 1px solid var(--line-soft);
	border-bottom: 1px solid var(--line-soft);
}
.origin-grid {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
	gap: 64px;
	align-items: start;
	margin-bottom: 64px;
}
.origin-prose p {
	font-size: 0.98rem;
	line-height: 1.75;
	color: var(--ink-soft);
	margin-bottom: 20px;
	max-width: 520px;
}
.origin-prose p strong {
	color: var(--ink);
	font-weight: 600;
}
.origin-question {
	font-family: var(--serif);
	font-size: clamp(1.3rem, 2.3vw, 1.6rem);
	font-style: italic;
	line-height: 1.5;
	color: var(--ink);
	border-left: 3px solid var(--accent-mid);
	padding: 10px 0 10px 28px;
	margin: 8px 0;
}

/* conceptual framework — five stations on one line */
.flow-panel {
	background: var(--surface);
	border: 1px solid var(--line-soft);
	border-radius: 6px;
	box-shadow: var(--shadow);
	padding: 44px 40px 40px;
}
.flow-title {
	font-size: 0.74rem;
	font-weight: 600;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--accent);
	text-align: center;
	margin-bottom: 40px;
}
.flow {
	list-style: none;
	display: grid;
	grid-template-columns: repeat(5, 1fr);
	gap: 8px;
	position: relative;
}
/* the line the stations sit on: col centers at 10% … 90% */
.flow::before {
	content: '';
	position: absolute;
	top: 27px;
	left: 10%;
	right: 10%;
	height: 2px;
	background: var(--line);
}
.flow li {
	position: relative;
	text-align: center;
	padding: 0 8px;
}
.flow li:not(:last-child)::after {
	content: '';
	position: absolute;
	top: 22px;
	right: -5px;
	width: 8px;
	height: 8px;
	border-top: 2px solid var(--ink-faint);
	border-right: 2px solid var(--ink-faint);
	transform: rotate(45deg);
}
.flow .flow-badge {
	position: relative;
	width: 54px;
	height: 54px;
	margin: 0 auto 16px;
	border-radius: 50%;
	background: var(--surface);
	border: 4.5px solid var(--stage-c, var(--sand-deep));
	display: flex;
	align-items: center;
	justify-content: center;
	color: var(--ink);
	box-shadow: 0 0 0 6px var(--surface);
}
.flow .flow-badge svg {
	width: 22px;
	height: 22px;
	fill: none;
	stroke: currentColor;
	stroke-width: 1.6;
	stroke-linecap: round;
	stroke-linejoin: round;
}
.flow .flow-stage {
	display: block;
	font-size: 0.66rem;
	font-weight: 600;
	letter-spacing: 0.16em;
	color: var(--accent);
	margin-bottom: 6px;
}
.flow h3 {
	font-family: var(--serif);
	font-size: 1rem;
	font-weight: 600;
	line-height: 1.3;
	margin-bottom: 7px;
}
.flow p {
	font-size: 0.78rem;
	line-height: 1.55;
	color: var(--ink-soft);
}
.flow .st-environment { --stage-c: var(--sand-deep); }
.flow .st-perception { --stage-c: var(--sage-deep); }
.flow .st-choice { --stage-c: #8fa98f; }
.flow .st-access { --stage-c: var(--blue-soft); }
.flow .st-outcomes { --stage-c: var(--terracotta); }

/* ── What This Project Aims to Do — editorial rows ────────── */
.aim-row {
	display: flex;
	align-items: flex-start;
	gap: 40px;
	padding: 44px 0;
	border-bottom: 1px solid var(--line-soft);
}
.aim-row:last-of-type {
	border-bottom: none;
}
.aim-badge {
	flex-shrink: 0;
	width: 64px;
	height: 64px;
	margin-top: 4px;
	border-radius: 50%;
	background: var(--aim-c, var(--accent-soft));
	color: var(--ink);
	font-family: var(--serif);
	font-style: italic;
	font-size: 1.35rem;
	display: inline-flex;
	align-items: center;
	justify-content: center;
}
.aim-content {
	max-width: 720px;
}
.aim-content h3 {
	font-family: var(--serif);
	font-size: clamp(1.25rem, 2.3vw, 1.5rem);
	font-weight: 600;
	line-height: 1.35;
	margin-bottom: 10px;
}
.aim-content p {
	font-size: 0.96rem;
	line-height: 1.65;
	color: var(--ink-soft);
	max-width: 620px;
}
.aim-behavior { --aim-c: var(--sage); }
.aim-access { --aim-c: rgba(128, 153, 181, 0.32); }
.aim-outcomes { --aim-c: rgba(215, 106, 84, 0.28); }

/* ── Closing statement ────────────────────────────────────── */
.section-closing {
	background: var(--surface-warm);
	border-top: 1px solid var(--line-soft);
	border-bottom: 1px solid var(--line-soft);
}
.closing {
	max-width: 780px;
	margin: 0 auto;
	text-align: center;
}
.closing .icon-badge {
	--badge-bg: var(--accent-soft);
	width: 58px;
	height: 58px;
	margin-bottom: 28px;
}
.closing .icon-badge svg {
	width: 26px;
	height: 26px;
}
.closing-text {
	font-family: var(--serif);
	font-size: clamp(1.3rem, 2.6vw, 1.7rem);
	line-height: 1.55;
	color: var(--ink);
	margin-bottom: 38px;
}
.closing-text strong {
	font-weight: 600;
}
.closing-actions {
	display: flex;
	justify-content: center;
	align-items: center;
	gap: 22px;
	flex-wrap: wrap;
}
.closing .text-link {
	font-size: 0.88rem;
	font-weight: 600;
	color: var(--red);
	text-decoration: none;
	display: inline-flex;
	align-items: center;
	gap: 7px;
}
.closing .text-link .arrow {
	transition: transform 0.3s ease;
}
.closing .text-link:hover .arrow {
	transform: translateX(4px);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1020px) {
	.p-hero-map {
		opacity: 0.3;
		width: 90%;
	}
	.origin-grid {
		grid-template-columns: 1fr;
		gap: 40px;
	}
	.origin-prose p {
		max-width: 620px;
	}
}

@media (max-width: 880px) {
	.compare {
		grid-template-columns: 1fr;
	}
	.compare-vs {
		margin: 22px auto;
	}
	.flow {
		grid-template-columns: 1fr;
		gap: 0;
	}
	.flow::before {
		top: 27px;
		bottom: 27px;
		left: 26px;
		right: auto;
		width: 2px;
		height: auto;
	}
	.flow li {
		display: grid;
		grid-template-columns: 54px 1fr;
		column-gap: 20px;
		text-align: left;
		padding: 0 0 34px;
	}
	.flow li:last-child {
		padding-bottom: 0;
	}
	.flow li:not(:last-child)::after {
		display: none;
	}
	.flow .flow-badge {
		margin: 0;
		grid-row: 1 / span 3;
	}
	.p-concepts {
		grid-template-columns: 1fr;
		gap: 26px;
	}
}

@media (max-width: 720px) {
	.p-hero {
		padding: 128px 0 64px;
	}
	.aim-row {
		flex-direction: column;
		gap: 18px;
		padding: 36px 0;
	}
	.aim-badge {
		width: 54px;
		height: 54px;
		font-size: 1.15rem;
	}
	.compare-panel {
		padding: 24px 22px 20px;
	}
	.flow-panel {
		padding: 32px 26px;
	}
}


/* ── Why This Matters — four consequences ─────────────────── */
.section-why {
	border-top: 1px solid var(--line-soft);
}
.why-list {
	border-top: 1px solid var(--line-soft);
}
.why-row {
	display: flex;
	align-items: flex-start;
	gap: 30px;
	padding: 38px 0;
	border-bottom: 1px solid var(--line-soft);
}
.why-row .icon-badge {
	width: 44px;
	height: 44px;
	margin-top: 2px;
}
.why-row .icon-badge svg {
	width: 21px;
	height: 21px;
}
.why-body {
	max-width: 720px;
}
.why-body h3 {
	font-family: var(--serif);
	font-size: clamp(1.15rem, 2.1vw, 1.35rem);
	font-weight: 600;
	line-height: 1.35;
	margin-bottom: 10px;
}
.why-body p {
	font-size: 0.94rem;
	line-height: 1.7;
	color: var(--ink-soft);
	max-width: 640px;
}
.why-body p strong {
	color: var(--ink);
	font-weight: 600;
}
.why-question {
	font-family: var(--serif);
	font-size: clamp(1.25rem, 2.3vw, 1.55rem);
	font-style: italic;
	line-height: 1.5;
	color: var(--ink);
	border-left: 3px solid var(--accent-mid);
	padding: 10px 0 10px 28px;
	margin-top: 48px;
	max-width: 760px;
}

/* ── Framework extension — stage 04 unfolded ──────────────── */
.flow-extend {
	margin-top: 42px;
	padding-top: 34px;
	border-top: 1px solid var(--line-soft);
	text-align: center;
}
.flow-extend-label {
	font-size: 0.74rem;
	font-weight: 600;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--ink-faint);
	margin-bottom: 18px;
}
.flow-extend-stage {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 22px;
	height: 22px;
	margin-right: 6px;
	border-radius: 50%;
	background: var(--blue-soft);
	color: var(--surface);
	font-size: 0.62rem;
	letter-spacing: 0.04em;
	vertical-align: -5px;
}
.flow-consequences {
	list-style: none;
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 10px;
}
.flow-consequences li {
	font-size: 0.82rem;
	font-weight: 500;
	color: var(--ink-soft);
	background: var(--surface-warm);
	border: 1px solid var(--line);
	border-radius: 100px;
	padding: 7px 18px;
}
.flow-note {
	font-family: var(--serif);
	font-size: clamp(1.08rem, 2vw, 1.3rem);
	font-style: italic;
	line-height: 1.5;
	text-align: center;
	color: var(--ink);
	margin: 38px auto 0;
	max-width: 620px;
}
.flow-subnote {
	font-size: 0.88rem;
	line-height: 1.65;
	text-align: center;
	color: var(--ink-soft);
	margin: 12px auto 0;
	max-width: 620px;
}

/* ── Questions that thread through the aims ───────────────── */
.aim-thread {
	margin-top: 4px;
	padding-top: 40px;
	border-top: 1px solid var(--line-soft);
}
.aim-thread-label {
	font-size: 0.72rem;
	font-weight: 600;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--accent);
	margin-bottom: 16px;
}
.aim-thread-list {
	list-style: none;
	display: grid;
	gap: 10px;
}
.aim-thread-list li {
	position: relative;
	padding-left: 22px;
	font-family: var(--serif);
	font-size: 1rem;
	line-height: 1.55;
	color: var(--ink);
}
.aim-thread-list li::before {
	content: '';
	position: absolute;
	left: 2px;
	top: 0.62em;
	width: 8px;
	height: 8px;
	border-top: 1.6px solid var(--accent-mid);
	border-right: 1.6px solid var(--accent-mid);
	transform: rotate(45deg);
}
.aim-thread-note {
	font-size: 0.9rem;
	line-height: 1.65;
	color: var(--ink-soft);
	margin-top: 20px;
	max-width: 720px;
}

/* ── From Diagnosis to Intervention ─────────────────────── */
.section-intervene {
	border-top: 1px solid var(--line-soft);
}
.intervene-question {
	font-family: var(--serif);
	font-size: clamp(1.25rem, 2.3vw, 1.55rem);
	font-style: italic;
	line-height: 1.5;
	color: var(--ink);
	border-left: 3px solid var(--accent-mid);
	padding: 10px 0 10px 28px;
	margin: -24px 0 60px;
	max-width: 760px;
}

/* the three diagnostic steps, on a single hairline */
.diag {
	list-style: none;
	border-left: 1px solid var(--line);
	padding-left: 34px;
	margin-bottom: 20px;
	max-width: 760px;
}
.diag-step {
	position: relative;
	padding-bottom: 38px;
}
.diag-step:last-child {
	padding-bottom: 0;
}
.diag-step::before {
	content: '';
	position: absolute;
	left: -39px;
	top: 5px;
	width: 9px;
	height: 9px;
	border-radius: 50%;
	background: var(--accent-mid);
	box-shadow: 0 0 0 5px var(--bg);
}
.diag-n {
	font-size: 0.7rem;
	font-weight: 600;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--accent);
	margin-bottom: 8px;
}
.diag-step h3 {
	font-family: var(--serif);
	font-size: 1.2rem;
	font-weight: 600;
	line-height: 1.35;
	margin-bottom: 8px;
}
.diag-step > p {
	font-size: 0.94rem;
	line-height: 1.7;
	color: var(--ink-soft);
	max-width: 640px;
}
.diag-gate {
	font-size: 0.9rem;
	line-height: 1.7;
	color: var(--ink-soft);
	margin-top: 14px;
	padding-left: 18px;
	border-left: 2px solid var(--gate-c, var(--line));
}
.diag-tag {
	display: block;
	font-size: 0.66rem;
	font-weight: 600;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--gate-c, var(--ink-faint));
	margin-bottom: 3px;
}
.diag-gate { --gate-c: var(--blue-soft); }
.diag-gate.alt { --gate-c: var(--terracotta); }

/* the four mechanisms, as editorial rows */
.mech {
	margin-top: 40px;
	border-top: 1px solid var(--line-soft);
}
.mech-row {
	display: flex;
	align-items: flex-start;
	gap: 30px;
	padding: 38px 0;
	border-bottom: 1px solid var(--line-soft);
}
.mech-letter {
	flex-shrink: 0;
	width: 44px;
	height: 44px;
	margin-top: 2px;
	border-radius: 50%;
	background: var(--mech-c, var(--sand-deep));
	color: var(--ink);
	font-family: var(--serif);
	font-style: italic;
	font-size: 1.15rem;
	display: inline-flex;
	align-items: center;
	justify-content: center;
}
.mech-body {
	max-width: 720px;
}
.mech-body h3 {
	font-family: var(--serif);
	font-size: clamp(1.15rem, 2.1vw, 1.35rem);
	font-weight: 600;
	line-height: 1.35;
	margin-bottom: 10px;
}
.mech-body > p {
	font-size: 0.94rem;
	line-height: 1.7;
	color: var(--ink-soft);
	max-width: 640px;
}
.mech-fix {
	margin-top: 14px;
}
.mech-fix-label {
	font-size: 0.66rem;
	font-weight: 600;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--accent);
	margin-right: 10px;
}
.mech-ask {
	font-family: var(--serif);
	font-style: italic;
	font-size: 1rem;
	line-height: 1.5;
	color: var(--ink);
	border-left: 2px solid var(--mech-c, var(--sand-deep));
	padding-left: 16px;
	margin-top: 18px;
}
.mech-eq {
	margin: 16px 0 0;
	padding-left: 18px;
	border-left: 2px solid var(--line);
}
.eq {
	font-size: 0.86rem;
	line-height: 1.6;
	color: var(--ink-soft);
}
.eq + .eq {
	margin-top: 10px;
}
.eq-lhs {
	display: block;
	font-size: 0.66rem;
	font-weight: 600;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--ink-faint);
	margin-bottom: 2px;
}
.eq-alt .eq-lhs {
	color: var(--terracotta);
}
.eq strong {
	color: var(--ink);
	font-weight: 600;
}

/* the agenda this opens up */
.agenda-chain {
	margin-top: 60px;
	padding-top: 44px;
	border-top: 1px solid var(--line-soft);
}
.agenda-chain-label {
	font-size: 0.74rem;
	font-weight: 600;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--accent);
	text-align: center;
	margin-bottom: 30px;
}
.chain {
	list-style: none;
	display: grid;
	grid-template-columns: repeat(5, 1fr);
	gap: 10px;
}
.chain li {
	position: relative;
	text-align: center;
	padding: 0 10px;
	font-family: var(--serif);
	font-size: 0.95rem;
	line-height: 1.4;
	color: var(--ink);
}
.chain li:not(:last-child)::after {
	content: '';
	position: absolute;
	top: 13px;
	right: -6px;
	width: 7px;
	height: 7px;
	border-top: 2px solid var(--ink-faint);
	border-right: 2px solid var(--ink-faint);
	transform: rotate(45deg);
}
.chain-n {
	display: block;
	font-family: var(--sans);
	font-size: 0.66rem;
	font-weight: 600;
	letter-spacing: 0.16em;
	color: var(--accent);
	margin-bottom: 10px;
}
.chain-note {
	font-size: 0.9rem;
	line-height: 1.7;
	color: var(--ink-soft);
	text-align: center;
	max-width: 660px;
	margin: 34px auto 0;
}
.intervene-close {
	font-family: var(--serif);
	font-size: clamp(1.3rem, 2.5vw, 1.65rem);
	font-style: italic;
	line-height: 1.5;
	text-align: center;
	color: var(--ink);
	max-width: 780px;
	margin: 56px auto 0;
}

/* ── Responsive — added sections ──────────────────────────── */
@media (max-width: 880px) {
	.chain {
		grid-template-columns: 1fr;
		gap: 28px;
	}
	.chain li {
		text-align: left;
		padding: 0;
	}
	.chain li:not(:last-child)::after {
		top: auto;
		bottom: -16px;
		right: auto;
		left: 3px;
		transform: rotate(135deg);
	}
	.chain-n {
		margin-bottom: 4px;
	}
}

@media (max-width: 720px) {
	.why-row,
	.mech-row {
		flex-direction: column;
		gap: 16px;
		padding: 32px 0;
	}
	.mech-letter {
		width: 38px;
		height: 38px;
		font-size: 1rem;
	}
	.why-row .icon-badge {
		width: 40px;
		height: 40px;
	}
	.diag {
		padding-left: 26px;
	}
	.diag-step::before {
		left: -31px;
	}
}

/* ── Reduced motion ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
	.route-draw {
		animation: none !important;
		stroke-dashoffset: 0;
	}
	.route-fade {
		opacity: 1;
		transition: none;
	}
}