:root {
	color-scheme: light dark;

	/* Colors - Light mode (twilight violet) */
	--color-primary: #5b3df5;
	--color-primary-hover: #4d31da;
	--color-primary-active: #3e26b8;
	--color-on-primary: #ffffff;
	--color-primary-text: #3d2ab5;
	--color-background: #f5f7ff;
	--color-surface: #ffffff;
	--color-text: #111827;
	--color-text-muted: #475569;
	--color-border: #cdd6f4;
	--color-error: #b42318;
	--color-error-hover: #8f1c13;
	--color-success: #1f8a4c;

	/* Colors - Dark mode (night aurora) */
	--color-primary-dark: #6651ea;
	--color-primary-hover-dark: #5f4de6;
	--color-primary-active-dark: #5544cf;
	--color-on-primary-dark: #ffffff;
	--color-primary-text-dark: #c3bbff;
	--color-background-dark: #0b1020;
	--color-surface-dark: #141b2f;
	--color-text-dark: #e8ecff;
	--color-text-muted-dark: #bec8e6;
	--color-border-dark: #2a3558;
	--color-error-dark: #ff8c8c;
	--color-error-hover-dark: #ff7777;
	--color-success-dark: #4ade80;

	/* Typography */
	--font-family: system-ui, sans-serif;
	--font-size-xs: 0.75rem;
	--font-size-sm: 0.875rem;
	--font-size-base: 1rem;
	--font-size-lg: 1.25rem;
	--font-size-xl: 2rem;
	--font-size-2xl: 3rem;
	--font-weight-normal: 400;
	--font-weight-medium: 500;
	--font-weight-semibold: 600;
	--font-weight-bold: 700;

	/* Spacing */
	--spacing-xs: 0.25rem;
	--spacing-sm: 0.5rem;
	--spacing-md: 1rem;
	--spacing-lg: 1.5rem;
	--spacing-xl: 2rem;
	--spacing-2xl: 3rem;

	/* Border radius */
	--radius-sm: 0.25rem;
	--radius-md: 0.5rem;
	--radius-lg: 0.75rem;
	--radius-xl: 1rem;
	--radius-full: 999px;

	/* Shadows */
	--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
	--shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
	--shadow-lg:
		0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
	--shadow-sm-dark: 0 1px 2px 0 rgb(255 255 255 / 0.05);
	--shadow-md-dark:
		0 4px 6px -1px rgb(255 255 255 / 0.08),
		0 2px 4px -2px rgb(255 255 255 / 0.08);
	--shadow-lg-dark:
		0 10px 15px -3px rgb(255 255 255 / 0.1),
		0 4px 6px -4px rgb(255 255 255 / 0.1);

	/* Transitions */
	--transition-fast: 0.15s ease;
	--transition-normal: 0.2s ease;

	/* Responsive spacing - used for page-level padding */
	--spacing-page: var(--spacing-2xl);
	--spacing-section: var(--spacing-xl);
	--spacing-header: var(--spacing-xl);

	/* App shell + marketing pages: one max width for main content */
	--content-max-width: 80rem;
}

/* Tablet responsive overrides */
@media (max-width: 1024px) {
	:root {
		--spacing-page: var(--spacing-xl);
		--spacing-section: var(--spacing-lg);
		--spacing-header: var(--spacing-lg);
	}
}

/* Mobile responsive overrides */
@media (max-width: 640px) {
	:root {
		--spacing-page: var(--spacing-md);
		--spacing-section: var(--spacing-md);
		--spacing-header: var(--spacing-md);
	}

	/* Prevent iOS from zooming when focusing small form controls. */
	input,
	textarea,
	select {
		font-size: 16px !important;
	}
}

:root[data-theme='dark'] {
	/* Colors - Dark mode (smoldering ember) */
	--color-primary: var(--color-primary-dark);
	--color-primary-hover: var(--color-primary-hover-dark);
	--color-primary-active: var(--color-primary-active-dark);
	--color-on-primary: var(--color-on-primary-dark);
	--color-primary-text: var(--color-primary-text-dark);
	--color-background: var(--color-background-dark);
	--color-surface: var(--color-surface-dark);
	--color-text: var(--color-text-dark);
	--color-text-muted: var(--color-text-muted-dark);
	--color-border: var(--color-border-dark);
	--color-error: var(--color-error-dark);
	--color-error-hover: var(--color-error-hover-dark);
	--color-success: var(--color-success-dark);

	/* Dark mode shadows - lighter for visibility */
	--shadow-sm: var(--shadow-sm-dark);
	--shadow-md: var(--shadow-md-dark);
	--shadow-lg: var(--shadow-lg-dark);
}

@media (prefers-color-scheme: dark) {
	:root:not([data-theme='light']) {
		/* Colors - Dark mode (smoldering ember) */
		--color-primary: var(--color-primary-dark);
		--color-primary-hover: var(--color-primary-hover-dark);
		--color-primary-active: var(--color-primary-active-dark);
		--color-on-primary: var(--color-on-primary-dark);
		--color-primary-text: var(--color-primary-text-dark);
		--color-background: var(--color-background-dark);
		--color-surface: var(--color-surface-dark);
		--color-text: var(--color-text-dark);
		--color-text-muted: var(--color-text-muted-dark);
		--color-border: var(--color-border-dark);
		--color-error: var(--color-error-dark);
		--color-error-hover: var(--color-error-hover-dark);
		--color-success: var(--color-success-dark);

		/* Dark mode shadows - lighter for visibility */
		--shadow-sm: var(--shadow-sm-dark);
		--shadow-md: var(--shadow-md-dark);
		--shadow-lg: var(--shadow-lg-dark);
	}
}

/* Reset and base styles */
*,
*::before,
*::after {
	box-sizing: border-box;
}

body {
	margin: 0;
	padding: 0;
	font-family: var(--font-family);
	font-size: var(--font-size-base);
	line-height: 1.5;
	color: var(--color-text);
	background-color: var(--color-background);
}

a {
	color: var(--color-primary-text);
}

:focus-visible {
	outline: 2px solid var(--color-primary);
	outline-offset: 2px;
}

#root {
	min-height: 100vh;
}

.app-shell {
	min-height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
}

.loading-spinner {
	width: 36px;
	height: 36px;
	border-radius: 999px;
	border: 4px solid color-mix(in srgb, var(--color-border) 70%, transparent);
	border-top-color: var(--color-primary);
	opacity: 0;
	animation:
		spinner-fade-in 0.2s ease 120ms forwards,
		spinner-spin 0.9s linear 120ms infinite;
}

@keyframes spinner-spin {
	to {
		transform: rotate(360deg);
	}
}

@keyframes spinner-fade-in {
	to {
		opacity: 1;
	}
}

.seo-page {
	max-width: var(--content-max-width);
	margin: 0 auto;
	padding: var(--spacing-2xl);
	display: grid;
	gap: var(--spacing-lg);
}

.seo-nav {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--spacing-lg);
	flex-wrap: wrap;
}

.seo-brand-link {
	display: inline-flex;
	align-items: center;
	gap: var(--spacing-sm);
	font-weight: var(--font-weight-semibold);
	color: var(--color-text);
	text-decoration: none;
}

.seo-brand-link img {
	width: 1.7rem;
	height: 1.7rem;
	border-radius: 0.5rem;
}

.seo-nav-links {
	display: inline-flex;
	flex-wrap: wrap;
	gap: var(--spacing-md);
}

.seo-nav-links a {
	text-decoration: none;
	color: var(--color-primary-text);
	font-weight: var(--font-weight-medium);
}

.seo-nav-links a.is-active,
.seo-nav-links a:hover {
	text-decoration: underline;
}

.seo-hero {
	display: grid;
	gap: var(--spacing-sm);
	padding: var(--spacing-lg);
	border-radius: var(--radius-lg);
	border: 1px solid var(--color-border);
	background: linear-gradient(
		140deg,
		color-mix(in srgb, var(--color-primary) 16%, var(--color-surface)),
		color-mix(in srgb, var(--color-primary) 5%, var(--color-background))
	);
	box-shadow: var(--shadow-sm);
}

.seo-hero h1 {
	margin: 0;
	font-size: clamp(1.75rem, 4vw, 2.5rem);
	line-height: 1.15;
}

.seo-hero p {
	margin: 0;
	max-width: 68ch;
	color: var(--color-text-muted);
}

.seo-eyebrow {
	margin: 0;
	font-size: var(--font-size-sm);
	font-weight: var(--font-weight-semibold);
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--color-primary-text);
}

.seo-section {
	padding: var(--spacing-lg);
	border-radius: var(--radius-lg);
	border: 1px solid var(--color-border);
	background-color: var(--color-surface);
	box-shadow: var(--shadow-sm);
	display: grid;
	gap: var(--spacing-sm);
}

.seo-section h2,
.seo-section h3 {
	margin: 0;
}

.seo-section p {
	margin: 0;
	color: var(--color-text-muted);
}

.seo-section ul,
.seo-section ol {
	margin: 0;
	padding-left: 1.25rem;
	display: grid;
	gap: 0.35rem;
}

.seo-code-block {
	margin: 0;
	padding: var(--spacing-md);
	overflow-x: auto;
	border-radius: var(--radius-md);
	background-color: var(--color-bg);
	border: 1px solid var(--color-border);
	font-size: 0.85rem;
	line-height: 1.45;
}

.seo-code-block code {
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
	white-space: pre;
}

.seo-card-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: var(--spacing-md);
	background: none;
	border: none;
	padding: 0;
	box-shadow: none;
}

.seo-card-grid article {
	padding: var(--spacing-lg);
	border-radius: var(--radius-lg);
	border: 1px solid var(--color-border);
	background-color: var(--color-surface);
	box-shadow: var(--shadow-sm);
	display: grid;
	gap: var(--spacing-sm);
}

.seo-inline-demo {
	padding: var(--spacing-md);
	border-radius: var(--radius-md);
	border: 1px solid var(--color-border);
	background: color-mix(
		in srgb,
		var(--color-background) 82%,
		var(--color-surface)
	);
	display: grid;
	gap: var(--spacing-sm);
}

.seo-demo-legend {
	display: inline-flex;
	gap: var(--spacing-xs);
	font-size: var(--font-size-sm);
	align-items: center;
}

.seo-demo-legend span {
	padding: 0.15rem 0.45rem;
	border-radius: var(--radius-full);
	background-color: color-mix(
		in srgb,
		var(--color-background) 90%,
		var(--color-surface)
	);
}

.seo-demo-grid {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: var(--spacing-xs);
}

.seo-demo-grid span {
	padding: var(--spacing-xs) var(--spacing-sm);
	border-radius: var(--radius-sm);
	font-size: var(--font-size-sm);
	text-align: center;
	font-weight: var(--font-weight-medium);
}

.seo-demo-grid .lv0 {
	background: color-mix(
		in srgb,
		var(--color-background) 88%,
		var(--color-surface)
	);
}

.seo-demo-grid .lv1,
.seo-demo-legend .lv1 {
	background: color-mix(
		in srgb,
		var(--color-primary) 18%,
		var(--color-surface)
	);
}

.seo-demo-grid .lv2,
.seo-demo-legend .lv2 {
	background: color-mix(
		in srgb,
		var(--color-primary) 34%,
		var(--color-surface)
	);
}

.seo-demo-grid .lv3,
.seo-demo-legend .lv3 {
	background: color-mix(
		in srgb,
		var(--color-primary) 50%,
		var(--color-surface)
	);
}

.seo-chip-row {
	display: flex;
	flex-wrap: wrap;
	gap: var(--spacing-xs);
}

.seo-chip {
	padding: 0.3rem 0.6rem;
	border-radius: var(--radius-full);
	border: 1px solid var(--color-border);
	background: color-mix(
		in srgb,
		var(--color-primary) 12%,
		var(--color-surface)
	);
	font-size: var(--font-size-sm);
	color: var(--color-text);
}

.seo-blog-list {
	display: grid;
	gap: var(--spacing-md);
}

.seo-blog-list article {
	padding: var(--spacing-md);
	border-radius: var(--radius-md);
	border: 1px solid var(--color-border);
	background: color-mix(
		in srgb,
		var(--color-background) 82%,
		var(--color-surface)
	);
	display: grid;
	gap: var(--spacing-xs);
}

.seo-meta {
	margin: 0;
	font-size: var(--font-size-sm);
	color: var(--color-text-muted);
}

.seo-blog-post {
	display: grid;
	gap: var(--spacing-sm);
}

.seo-footer {
	display: grid;
	gap: var(--spacing-md);
	padding-top: var(--spacing-md);
	border-top: 1px solid var(--color-border);
}

.seo-site-footer-links {
	display: flex;
	flex-wrap: wrap;
	gap: var(--spacing-md);
}

.seo-site-footer-links a {
	text-decoration: none;
	color: var(--color-primary-text);
	font-weight: var(--font-weight-medium);
}

.seo-site-footer-links a.is-active,
.seo-site-footer-links a:hover {
	text-decoration: underline;
}

.seo-footer-tagline {
	margin: 0;
	color: var(--color-text-muted);
	font-size: var(--font-size-sm);
	max-width: 68ch;
}

.seo-footer-marketing {
	margin-top: var(--spacing-xl);
	padding-top: var(--spacing-md);
	border-top: 1px solid var(--color-border);
}

@media (max-width: 900px) {
	.seo-card-grid {
		grid-template-columns: 1fr;
	}
}

@media (max-width: 640px) {
	.seo-page {
		padding: var(--spacing-md);
	}

	.seo-demo-grid {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}