/* ═══════════════════════════════════════════════════════════════
   selfdriven Foundation — Shared Stylesheet
   Used by: default.html, prose.html layouts
   ═══════════════════════════════════════════════════════════════ */

/* ─── Design tokens ──────────────────────────────────────────── */
:root {
	--bg: #f5f2ed;
	--surface: #edeae3;
	--surface2: #e5e1d8;
	--border: #ddd8ce;
	--text: #1a1410;
	--muted: #6b5f52;
	--muted2: #9e9085;
	--accent: #c8442f;
	--accent-dim: rgba(200, 68, 47, 0.10);
	--card-radius: 20px;
	--shadow: 0 2px 16px rgba(0, 0, 0, 0.07);
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg: #0a0a0a;
		--surface: #161616;
		--surface2: #1e1e1e;
		--border: #242424;
		--text: #f0ede8;
		--muted: #b0b0b0;
		--muted2: #666;
		--accent: #e85d4a;
		--accent-dim: rgba(232, 93, 74, 0.12);
		--shadow: 0 2px 16px rgba(0, 0, 0, 0.4);
	}
}

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

html {
	font-size: 16px;
}

body {
	font-family: 'Poppins', 'Inter', system-ui, sans-serif;
	background: var(--bg);
	color: var(--text);
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
}

a {
	color: inherit;
	text-decoration: none;
}

/* ─── Nav ────────────────────────────────────────────────────── */
nav {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 100;
	padding: 20px 40px;
	display: flex;
	align-items: center;
	justify-content: space-between;
	transition: background 0.3s, backdrop-filter 0.3s;
}

nav.scrolled {
	background: rgba(245, 242, 237, 0.92);
	backdrop-filter: blur(12px);
	border-bottom: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
	nav.scrolled {
		background: rgba(10, 10, 10, 0.92);
	}
}

.nav-logo img {
	height: 28px;
	width: auto;
	display: block;
}

.nav-links {
	display: flex;
	gap: 28px;
	list-style: none;
}

.nav-links a {
	font-size: 13px;
	font-weight: 500;
	letter-spacing: 0.02em;
	color: var(--muted);
	transition: color 0.2s;
}

.nav-links a:hover {
	color: var(--text);
}

/* ─── Footer ─────────────────────────────────────────────────── */
footer {
	border-top: 1px solid var(--border);
	padding: 48px 40px;
	max-width: 1100px;
	margin: 0 auto;
	display: flex;
	align-items: center;
	justify-content: space-between;
}

.footer-logo img {
	height: 16px;
	width: auto;
	opacity: 1;
}

.footer-links {
	display: flex;
	gap: 24px;
	list-style: none;
}

.footer-links a {
	font-size: 12px;
	color: var(--muted2);
	transition: color 0.2s;
}

.footer-links a:hover {
	color: var(--muted);
}

/* ─── Hero (index page) ──────────────────────────────────────── */
.hero {
	padding: 160px 40px 80px;
	max-width: 1100px;
	margin: 0 auto;
}

.hero-eyebrow {
	font-size: 11px;
	font-weight: 600;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--accent);
	margin-bottom: 20px;
}

.hero h1 {
	font-size: clamp(48px, 7vw, 80px);
	font-weight: 800;
	letter-spacing: -0.04em;
	line-height: 1.05;
	margin-bottom: 28px;
}

.hero h1 em {
	color: var(--accent);
	font-style: italic;
}

.hero-desc {
	font-size: 17px;
	color: var(--muted);
	line-height: 1.7;
	max-width: 560px;
}

/* ─── Stats ──────────────────────────────────────────────────── */
.stats {
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 40px 80px;
	display: flex;
	gap: 48px;
}

.stat-num {
	font-size: 56px;
	font-weight: 800;
	letter-spacing: -0.04em;
	line-height: 1;
	margin-bottom: 8px;
}

.stat-num span {
	color: var(--accent);
}

.stat-label {
	font-size: 13px;
	color: var(--muted);
	line-height: 1.5;
}

/* ─── Grid (index page) ──────────────────────────────────────── */
.grid-section {
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 40px;
}

.grid-section-header {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	margin-bottom: 24px;
}

.grid-section-header h2 {
	font-size: 22px;
	font-weight: 700;
	letter-spacing: -0.03em;
}

.grid-section-header span {
	font-size: 12px;
	color: var(--muted2);
}

.areas-grid {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 12px;
}

.area-card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--card-radius);
	padding: 28px 24px 24px;
	cursor: pointer;
	transition: transform 0.2s, box-shadow 0.2s;
	position: relative;
	overflow: hidden;
	box-shadow: var(--shadow);
}

.area-card::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 3px;
	background: var(--accent);
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 0.25s ease;
}

.area-card:hover,
.area-card.active {
	transform: translateY(-3px);
	box-shadow: var(--shadow), 0 8px 32px rgba(0, 0, 0, 0.12);
}

.area-card:hover::before,
.area-card.active::before {
	transform: scaleX(1);
}

.area-card-header {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	margin-bottom: 12px;
}

.area-title {
	font-size: 15px;
	font-weight: 700;
	letter-spacing: -0.02em;
}

.area-num {
	font-size: 11px;
	font-weight: 600;
	letter-spacing: 0.06em;
	color: var(--accent);
	background: var(--bg);
	border: 1px solid var(--border);
	border-radius: 999px;
	width: 32px;
	height: 32px;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-shrink: 0;
}

.area-subtitle {
	font-size: 12px;
	color: var(--muted);
	line-height: 1.6;
	margin-bottom: 16px;
}

.area-arrow {
	font-size: 16px;
	color: var(--muted2);
	transition: color 0.2s, transform 0.2s;
}

.area-card:hover .area-arrow,
.area-card.active .area-arrow {
	color: var(--accent);
	transform: translateX(3px);
}

/* ─── Detail panel ───────────────────────────────────────────── */
.detail-panel {
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 40px;
	overflow: hidden;
	max-height: 0;
	transition: max-height 0.4s ease, padding 0.3s;
}

.detail-panel.open {
	max-height: 600px;
	padding: 16px 40px 0;
}

.detail-inner {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--card-radius);
	padding: 48px;
}

.detail-header {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	margin-bottom: 16px;
}

.detail-num {
	font-size: 72px;
	font-weight: 800;
	letter-spacing: -0.06em;
	line-height: 1;
	color: var(--border);
}

.detail-close {
	background: var(--bg);
	border: 1px solid var(--border);
	border-radius: 999px;
	width: 36px;
	height: 36px;
	cursor: pointer;
	color: var(--muted);
	font-size: 14px;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: color 0.2s, border-color 0.2s;
}

.detail-close:hover {
	color: var(--text);
	border-color: var(--muted);
}

.detail-title {
	font-size: 32px;
	font-weight: 800;
	letter-spacing: -0.04em;
	margin-bottom: 8px;
}

.detail-tagline {
	font-size: 14px;
	color: var(--accent);
	font-style: italic;
	margin-bottom: 28px;
}

.detail-body {
	font-size: 16px;
	color: var(--muted);
	line-height: 1.8;
	max-width: 680px;
}

/* ─── Connections section ────────────────────────────────────── */
.connections-section {
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 40px 120px;
}

.connections-inner {
	background: var(--surface);
	border: 1px solid var(--border);
	padding: 48px;
	border-radius: var(--card-radius);
}

.section-label {
	font-size: 11px;
	font-weight: 600;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--accent);
	margin-bottom: 16px;
}

.connections-inner h2 {
	font-size: 28px;
	font-weight: 700;
	letter-spacing: -0.03em;
	margin-bottom: 20px;
}

.connections-inner>p {
	font-size: 15px;
	color: var(--muted);
	line-height: 1.8;
	max-width: 680px;
	margin-bottom: 32px;
}

.flow-row {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	row-gap: 8px;
}

.flow-node {
	background: var(--bg);
	border: 1px solid var(--border);
	padding: 8px 16px;
	font-size: 12px;
	font-weight: 600;
	border-radius: 999px;
}

.flow-arrow {
	font-size: 14px;
	color: var(--muted2);
	padding: 0 8px;
}

/* ═══════════════════════════════════════════════════════════════
   PROSE LAYOUT — long-form article / framework documents
   ═══════════════════════════════════════════════════════════════ */

/* Page wrapper */
.prose-page {
	padding-top: 120px;
	padding-bottom: 120px;
}

/* Two-column layout: TOC sidebar + article body */
.prose-container {
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 40px;
	display: grid;
	grid-template-columns: 220px 1fr;
	gap: 64px;
	align-items: start;
}

/* ─── Eyebrow / page label ───────────────────────────────────── */
.prose-eyebrow {
	font-size: 11px;
	font-weight: 600;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--accent);
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 40px 28px calc(40px + 220px + 64px);
}

/* ─── Sticky TOC sidebar ─────────────────────────────────────── */
.prose-toc {
	position: sticky;
	top: 88px;
	font-size: 12px;
	line-height: 1.6;
}

.prose-toc-label {
	font-size: 10px;
	font-weight: 700;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--muted2);
	margin-bottom: 16px;
}

.prose-toc ol {
	list-style: none;
	padding: 0;
	margin: 0;
	display: flex;
	flex-direction: column;
	gap: 2px;
}

.prose-toc li a {
	display: block;
	padding: 5px 10px;
	color: var(--muted);
	border-radius: 6px;
	transition: color 0.15s, background 0.15s;
	border-left: 2px solid transparent;
}

.prose-toc li a:hover,
.prose-toc li a.active {
	color: var(--text);
	background: var(--surface);
	border-left-color: var(--accent);
}

.prose-toc li.toc-sub a {
	padding-left: 20px;
	font-size: 11px;
}

/* ─── Article body ───────────────────────────────────────────── */
.prose-body {
	min-width: 0;
	/* prevent grid blowout */
}

/* h1 — page title */
.prose-body h1 {
	font-size: clamp(32px, 4vw, 52px);
	font-weight: 800;
	letter-spacing: -0.04em;
	line-height: 1.08;
	margin-bottom: 28px;
}

/* Lead paragraph (first <p> after h1) */
.prose-body>p:first-of-type {
	font-size: 18px;
	color: var(--muted);
	line-height: 1.75;
	margin-bottom: 48px;
	padding-bottom: 48px;
	border-bottom: 1px solid var(--border);
}

/* Section separators via h2 */
.prose-body h2 {
	font-size: 26px;
	font-weight: 800;
	letter-spacing: -0.04em;
	margin-top: 72px;
	margin-bottom: 20px;
	padding-top: 72px;
	border-top: 1px solid var(--border);
	scroll-margin-top: 100px;
}

/* first h2 doesn't need top border/padding — lead paragraph provides the break */
.prose-body h2:first-of-type {
	border-top: none;
	padding-top: 0;
	margin-top: 0;
}

.prose-body h3 {
	font-size: 17px;
	font-weight: 700;
	letter-spacing: -0.025em;
	margin-top: 40px;
	margin-bottom: 12px;
	color: var(--text);
	scroll-margin-top: 100px;
}

.prose-body h4 {
	font-size: 13px;
	font-weight: 700;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--accent);
	margin-top: 28px;
	margin-bottom: 8px;
}

/* Body copy */
.prose-body p {
	font-size: 16px;
	color: var(--muted);
	line-height: 1.85;
	margin-bottom: 20px;
}

/* Bold inline */
.prose-body strong {
	font-weight: 700;
	color: var(--text);
}

/* Italic / emphasis */
.prose-body em {
	font-style: italic;
}

/* Links */
.prose-body a {
	color: var(--accent);
	text-decoration: underline;
	text-decoration-color: var(--accent-dim);
	text-underline-offset: 3px;
	transition: text-decoration-color 0.2s;
}

.prose-body a:hover {
	text-decoration-color: var(--accent);
}

/* Unordered lists */
.prose-body ul {
	list-style: none;
	padding: 0;
	margin: 0 0 24px 0;
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.prose-body ul li {
	font-size: 15px;
	color: var(--muted);
	line-height: 1.7;
	padding-left: 20px;
	position: relative;
}

.prose-body ul li::before {
	content: '—';
	position: absolute;
	left: 0;
	color: var(--accent);
	font-weight: 600;
}

/* Ordered lists */
.prose-body ol {
	list-style: none;
	padding: 0;
	counter-reset: ol-counter;
	margin: 0 0 24px 0;
	display: flex;
	flex-direction: column;
	gap: 8px;
}

.prose-body ol li {
	font-size: 15px;
	color: var(--muted);
	line-height: 1.7;
	padding-left: 32px;
	position: relative;
	counter-increment: ol-counter;
}

.prose-body ol li::before {
	content: counter(ol-counter, decimal-leading-zero);
	position: absolute;
	left: 0;
	font-size: 11px;
	font-weight: 700;
	letter-spacing: 0.04em;
	color: var(--accent);
	top: 4px;
}

/* Horizontal rule */
.prose-body hr {
	border: none;
	border-top: 1px solid var(--border);
	margin: 64px 0;
}

/* Tables */
.prose-body table {
	width: 100%;
	border-collapse: collapse;
	margin: 32px 0;
	font-size: 14px;
	border-radius: var(--card-radius);
	overflow: hidden;
	border: 1px solid var(--border);
}

.prose-body thead tr {
	background: var(--surface2);
}

.prose-body thead th {
	text-align: left;
	padding: 14px 18px;
	font-size: 11px;
	font-weight: 700;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--muted2);
	border-bottom: 1px solid var(--border);
}

.prose-body tbody tr {
	border-bottom: 1px solid var(--border);
	transition: background 0.15s;
}

.prose-body tbody tr:last-child {
	border-bottom: none;
}

.prose-body tbody tr:hover {
	background: var(--surface);
}

.prose-body tbody td {
	padding: 14px 18px;
	color: var(--muted);
	vertical-align: top;
	line-height: 1.6;
}

.prose-body tbody td:first-child {
	font-weight: 600;
	color: var(--text);
}

/* Blockquote — used for callouts/summaries */
.prose-body blockquote {
	margin: 36px 0;
	padding: 28px 32px;
	background: var(--surface);
	border: 1px solid var(--border);
	border-left: 3px solid var(--accent);
	border-radius: 0 var(--card-radius) var(--card-radius) 0;
}

.prose-body blockquote p {
	font-size: 17px;
	font-style: italic;
	color: var(--text);
	line-height: 1.75;
	margin: 0;
}

/* Inline code */
.prose-body code {
	font-family: 'SF Mono', 'Fira Code', ui-monospace, monospace;
	font-size: 13px;
	background: var(--surface2);
	border: 1px solid var(--border);
	border-radius: 5px;
	padding: 2px 6px;
	color: var(--accent);
}

/* Code blocks */
.prose-body pre {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--card-radius);
	padding: 28px 32px;
	overflow-x: auto;
	margin: 24px 0;
}

.prose-body pre code {
	background: none;
	border: none;
	padding: 0;
	color: var(--text);
	font-size: 13px;
	line-height: 1.7;
}

/* ─── Layer / step list pattern (numbered bold items) ────────── */
/* Used for "Layer 1: ... Layer 2: ..." style content */
.prose-body p+p>strong:first-child {
	/* Intentionally not floated — kept inline */
}

/* ─── Stacked list cards — Definition-style content ─────────── */
/* Wraps around groups of h3 + content as visual cards */
.prose-section-card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--card-radius);
	padding: 36px 40px;
	margin: 24px 0;
}

.prose-section-card h3 {
	margin-top: 0;
}

/* ─── Footer nav (prev/next links) ──────────────────────────── */
.prose-footer-nav {
	max-width: 1100px;
	margin: 0 auto;
	padding: 48px 40px;
	display: flex;
	justify-content: space-between;
	align-items: center;
	border-top: 1px solid var(--border);
	gap: 16px;
}

.prose-footer-nav a {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-size: 13px;
	font-weight: 600;
	color: var(--muted);
	padding: 10px 18px;
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: 999px;
	transition: color 0.2s, border-color 0.2s;
}

.prose-footer-nav a:hover {
	color: var(--text);
	border-color: var(--muted);
}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
	.areas-grid {
		grid-template-columns: repeat(2, 1fr);
	}

	.stats {
		flex-wrap: wrap;
	}

	.stat {
		flex: 0 0 45%;
	}

	.prose-container {
		grid-template-columns: 1fr;
		gap: 0;
	}

	.prose-toc {
		display: none;
	}

	.prose-eyebrow {
		padding-left: 40px;
	}
}

@media (max-width: 600px) {
	nav {
		padding-left: 20px;
		padding-right: 20px;
	}

	.nav-links {
		display: none;
	}

	.hero {
		padding: 120px 20px 60px;
	}

	.stats {
		padding: 0 20px 60px;
	}

	.grid-section,
	.detail-panel,
	.connections-section {
		padding-left: 20px;
		padding-right: 20px;
	}

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

	.detail-inner,
	.connections-inner {
		padding: 28px 20px;
	}

	.detail-num {
		font-size: 48px;
	}

	footer {
		flex-direction: column;
		gap: 24px;
		align-items: flex-start;
		padding: 40px 20px;
	}

	.prose-page {
		padding-top: 88px;
	}

	.prose-container {
		padding: 0 20px;
	}

	.prose-eyebrow {
		padding: 0 20px 20px;
	}

	.prose-body h1 {
		font-size: 28px;
	}

	.prose-body h2 {
		font-size: 22px;
	}

	.prose-body table {
		font-size: 12px;
	}

	.prose-body thead th,
	.prose-body tbody td {
		padding: 10px 12px;
	}

	.prose-footer-nav {
		padding: 32px 20px;
		flex-direction: column;
	}
}

/* ── Share Card ────────────────────────────────────────────────── */
.sd-share-card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--card-radius);
	box-shadow: var(--shadow);
	padding: 28px 32px;
	max-width: 580px;
	width: 100%;
	position: relative;
	overflow: hidden;
}

.sd-share-card::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 3px;
	background: var(--accent);
	border-radius: var(--card-radius) var(--card-radius) 0 0;
}

.sd-share-eyebrow {
	font-size: 11px;
	font-weight: 700;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--accent);
	margin: 0 0 8px;
}

.sd-share-title {
	font-size: 18px;
	font-weight: 700;
	color: var(--text);
	margin: 0 0 4px;
	line-height: 1.3;
}

.sd-share-subtitle {
	font-size: 13px;
	color: var(--muted);
	margin: 0 0 20px;
	line-height: 1.6;
}

/* URL pill */
.sd-share-url-row {
	display: flex;
	align-items: center;
	gap: 10px;
	background: var(--surface2);
	border: 1px solid var(--border);
	border-radius: 999px;
	padding: 10px 16px 10px 20px;
	margin-bottom: 18px;
}

.sd-share-url-text {
	flex: 1;
	font-family: var(--mono);
	font-size: 12px;
	color: var(--muted);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.sd-copy-btn {
	flex-shrink: 0;
	background: var(--accent);
	color: #fff;
	border: none;
	border-radius: 999px;
	padding: 6px 18px;
	font-family: var(--font);
	font-size: 12px;
	font-weight: 600;
	cursor: pointer;
	transition: opacity 0.15s, transform 0.1s;
	white-space: nowrap;
}

.sd-copy-btn:hover {
	opacity: 0.88;
	transform: scale(1.03);
}

.sd-copy-btn:active {
	transform: scale(0.97);
}

.sd-copy-btn.copied {
	background: #2e7d32;
}

/* Social buttons */
.sd-share-label {
	font-size: 11px;
	font-weight: 600;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--muted2);
	margin-bottom: 10px;
}

.sd-social-row {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
}

.sd-social-btn {
	display: inline-flex;
	align-items: center;
	gap: 7px;
	border: 1px solid var(--border);
	border-radius: 12px;
	padding: 8px 16px;
	font-family: var(--font);
	font-size: 13px;
	font-weight: 500;
	color: var(--text);
	background: var(--surface);
	cursor: pointer;
	text-decoration: none;
	transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.sd-social-btn:hover {
	background: var(--accent-dim);
	border-color: var(--accent);
	transform: translateY(-1px);
}

.sd-social-btn svg {
	width: 16px;
	height: 16px;
	flex-shrink: 0;
	fill: currentColor;
}

/* Toast */
.sd-toast {
	position: fixed;
	bottom: 28px;
	left: 50%;
	transform: translateX(-50%) translateY(80px);
	background: var(--text);
	color: var(--bg);
	font-family: var(--font);
	font-size: 13px;
	font-weight: 500;
	border-radius: 999px;
	padding: 10px 22px;
	box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
	transition: transform 0.3s cubic-bezier(.34, 1.56, .64, 1), opacity 0.3s;
	opacity: 0;
	z-index: 9999;
	pointer-events: none;
}

.sd-toast.show {
	transform: translateX(-50%) translateY(0);
	opacity: 1;
}