/*
 * SoloToChina Child Theme design system foundation.
 *
 * Breakpoint contract:
 * - compact mobile: 0-599px (including 375, 390, and 430px QA widths)
 * - tablet: 600-839px (including 768px QA width)
 * - desktop: 840px+ (including 1280 and 1440px QA widths)
 */

:root {
	/* Colors */
	--stc-color-ink: #13211b;
	--stc-color-ink-soft: #33443c;
	--stc-color-muted: #627068;
	--stc-color-canvas: #f6f7f3;
	--stc-color-surface: #ffffff;
	--stc-color-surface-muted: #eef1eb;
	--stc-color-line: #dfe5df;
	--stc-color-brand: #b63f2d;
	--stc-color-brand-hover: #963222;
	--stc-color-jade: #155f4a;
	--stc-color-jade-hover: #0f4c3b;
	--stc-color-gold-muted: #8b6a32;
	--stc-color-focus: #2b78c5;
	--stc-color-on-dark: #f9fbf8;

	/* Typography */
	--stc-font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
	--stc-font-display: Georgia, "Times New Roman", serif;
	--stc-font-size-xs: 0.75rem;
	--stc-font-size-sm: 0.875rem;
	--stc-font-size-base: 1rem;
	--stc-font-size-md: 1.125rem;
	--stc-font-size-lg: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
	--stc-font-size-xl: clamp(1.75rem, 1.35rem + 1.25vw, 2.5rem);
	--stc-font-size-hero: clamp(2.5rem, 1.65rem + 3.2vw, 5.25rem);
	--stc-leading-tight: 1.08;
	--stc-leading-heading: 1.18;
	--stc-leading-body: 1.7;
	--stc-reading-measure: 70ch;

	/* Spacing: four-pixel base with larger editorial intervals */
	--stc-space-1: 0.25rem;
	--stc-space-2: 0.5rem;
	--stc-space-3: 0.75rem;
	--stc-space-4: 1rem;
	--stc-space-5: 1.25rem;
	--stc-space-6: 1.5rem;
	--stc-space-8: 2rem;
	--stc-space-10: 2.5rem;
	--stc-space-12: 3rem;
	--stc-space-16: 4rem;
	--stc-space-20: 5rem;
	--stc-space-24: 6rem;

	/* Containers and grids */
	--stc-container-max: 76rem;
	--stc-container-reading: 48rem;
	--stc-container-gutter: clamp(1.25rem, 4vw, 2.5rem);
	--stc-grid-gap: clamp(0.875rem, 2vw, 1.5rem);

	/* Shape and elevation */
	--stc-radius-xs: 0.25rem;
	--stc-radius-sm: 0.5rem;
	--stc-radius-md: 0.875rem;
	--stc-radius-lg: 1.25rem;
	--stc-radius-pill: 999px;
	--stc-shadow-card: 0 0.75rem 2rem rgba(19, 33, 27, 0.08);
	--stc-shadow-raised: 0 1.25rem 3.5rem rgba(19, 33, 27, 0.12);
	--stc-shadow-focus: 0 0 0 0.25rem rgba(43, 120, 197, 0.2);

	/* Controls and media */
	--stc-control-height: 2.875rem;
	--stc-control-padding-inline: 1.125rem;
	--stc-image-ratio-card: 3 / 4;
	--stc-image-ratio-landscape: 16 / 10;
	--stc-image-ratio-hero: 16 / 9;

	/* Motion */
	--stc-motion-duration-fast: 140ms;
	--stc-motion-duration-base: 220ms;
	--stc-motion-duration-slow: 420ms;
	--stc-motion-ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);
	--stc-motion-ease-emphasized: cubic-bezier(0.16, 1, 0.3, 1);

	/* Parent Theme compatibility aliases */
	--stc-ink: var(--stc-color-ink);
	--stc-muted: var(--stc-color-muted);
	--stc-line: var(--stc-color-line);
	--stc-paper: var(--stc-color-canvas);
	--stc-red: var(--stc-color-brand);
	--stc-green: var(--stc-color-jade);
	--stc-gold: var(--stc-color-gold-muted);
	--stc-radius: var(--stc-radius-sm);
	--stc-max: var(--stc-container-max);
	--stc-card-shadow: var(--stc-shadow-card);
	--stc-soft-shadow: var(--stc-shadow-raised);
}

html {
	scroll-behavior: smooth;
	text-size-adjust: 100%;
}

body {
	background: var(--stc-color-canvas);
	color: var(--stc-color-ink);
	font-family: var(--stc-font-sans);
	font-size: var(--stc-font-size-base);
	line-height: var(--stc-leading-body);
	-webkit-font-smoothing: antialiased;
}

:where(h1, h2, h3) {
	color: var(--stc-color-ink);
	font-family: var(--stc-font-display);
	font-weight: 600;
	letter-spacing: -0.025em;
	line-height: var(--stc-leading-heading);
	text-wrap: balance;
}

:where(p, li) {
	text-wrap: pretty;
}

:where(img, svg) {
	display: block;
	max-width: 100%;
}

:where(a, button, input, select, textarea, summary) {
	touch-action: manipulation;
}

:where(a, button, input, select, textarea, summary):focus-visible {
	border-radius: var(--stc-radius-xs);
	outline: 0.1875rem solid var(--stc-color-focus);
	outline-offset: 0.1875rem;
	box-shadow: var(--stc-shadow-focus);
}

.stc-container {
	box-sizing: border-box;
	inline-size: min(100%, var(--stc-container-max));
	margin-inline: auto;
	padding-inline: var(--stc-container-gutter);
}

.stc-reading-width {
	inline-size: min(100%, var(--stc-container-reading));
}

.stc-grid {
	display: grid;
	gap: var(--stc-grid-gap);
}

:where(.stc-button, .stc-page-actions button) {
	align-items: center;
	border: 1px solid transparent;
	border-radius: var(--stc-radius-sm);
	cursor: pointer;
	display: inline-flex;
	font: 650 var(--stc-font-size-sm) / 1 var(--stc-font-sans);
	gap: var(--stc-space-2);
	justify-content: center;
	min-block-size: var(--stc-control-height);
	padding: var(--stc-space-3) var(--stc-control-padding-inline);
	text-decoration: none;
	transition:
		background-color var(--stc-motion-duration-fast) var(--stc-motion-ease-standard),
		border-color var(--stc-motion-duration-fast) var(--stc-motion-ease-standard),
		color var(--stc-motion-duration-fast) var(--stc-motion-ease-standard),
		transform var(--stc-motion-duration-fast) var(--stc-motion-ease-standard);
}

:where(.stc-button, .stc-page-actions button):active {
	transform: translateY(1px);
}

.stc-button--primary {
	background: var(--stc-color-brand);
	color: var(--stc-color-on-dark);
}

.stc-button--primary:hover {
	background: var(--stc-color-brand-hover);
}

.stc-button--secondary {
	background: var(--stc-color-jade);
	color: var(--stc-color-on-dark);
}

.stc-button--secondary:hover {
	background: var(--stc-color-jade-hover);
}

:where(input:not([type="checkbox"]):not([type="radio"]), select, textarea) {
	background: var(--stc-color-surface);
	border: 1px solid var(--stc-color-line);
	border-radius: var(--stc-radius-sm);
	color: var(--stc-color-ink);
	font: inherit;
	min-block-size: var(--stc-control-height);
	padding: var(--stc-space-3) var(--stc-space-4);
	transition:
		border-color var(--stc-motion-duration-fast) var(--stc-motion-ease-standard),
		box-shadow var(--stc-motion-duration-fast) var(--stc-motion-ease-standard);
}

:where(input:not([type="checkbox"]):not([type="radio"]), select, textarea):hover {
	border-color: color-mix(in srgb, var(--stc-color-ink) 28%, var(--stc-color-line));
}

.stc-ui-card {
	background: var(--stc-color-surface);
	border: 1px solid var(--stc-color-line);
	border-radius: var(--stc-radius-md);
	box-shadow: var(--stc-shadow-card);
}

.stc-media-card {
	aspect-ratio: var(--stc-image-ratio-card);
	overflow: clip;
}

.stc-media-card > img {
	block-size: 100%;
	inline-size: 100%;
	object-fit: cover;
}

@media (hover: hover) and (pointer: fine) {
	.stc-ui-card {
		transition:
			border-color var(--stc-motion-duration-base) var(--stc-motion-ease-standard),
			box-shadow var(--stc-motion-duration-base) var(--stc-motion-ease-standard),
			transform var(--stc-motion-duration-base) var(--stc-motion-ease-standard);
	}

	.stc-ui-card:hover {
		border-color: color-mix(in srgb, var(--stc-color-jade) 24%, var(--stc-color-line));
		box-shadow: var(--stc-shadow-raised);
		transform: translateY(-0.125rem);
	}
}

@media (max-width: 839px) {
	:root {
		--stc-container-gutter: clamp(1.25rem, 4.8vw, 2rem);
		--stc-grid-gap: clamp(0.75rem, 2.8vw, 1.25rem);
		--stc-control-height: 3rem;
	}
}

@media (max-width: 599px) {
	:root {
		--stc-container-gutter: clamp(1rem, 5.1vw, 1.375rem);
		--stc-space-section: clamp(3.5rem, 13vw, 5rem);
	}

	:where(.stc-button, .stc-page-actions button) {
		inline-size: auto;
		max-inline-size: 100%;
	}
}

@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	*,
	*::before,
	*::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		scroll-behavior: auto !important;
		transition-duration: 0.01ms !important;
	}
}

@media (forced-colors: active) {
	:where(a, button, input, select, textarea, summary):focus-visible {
		outline-color: Highlight;
	}
}