/* ============================================================================
 * LAB INDEX PAGE STYLES
 * ============================================================================
 * Inherits design tokens from main site. Self-contained for lab pages.
 * ============================================================================ */

:root {
	/* Surface colors - warm dark palette (from main site) */
	--surface-0: #0f0d0b;
	--surface-1: #1a1612;
	--surface-2: #252019;
	--surface-3: #302a21;

	/* Text colors */
	--text-0: #f5f2ed;
	--text-1: #c4bdb2;
	--text-muted: #7a7368;

	/* Accent colors */
	--accent-0: #c4956a;
	--accent-1: #a17a52;

	/* Glass effects */
	--glass-bg: rgba(26, 22, 18, 0.8);
	--glass-stroke: rgba(255, 255, 255, 0.08);

	/* Shadows */
	--shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
	--shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);

	/* Typography */
	--font-sans: "Inter", system-ui, -apple-system, sans-serif;
	--font-mono: "JetBrains Mono", "Fira Code", monospace;

	/* Spacing */
	--space-2: 0.5rem;
	--space-3: 0.75rem;
	--space-4: 1rem;
	--space-5: 1.25rem;
	--space-6: 1.5rem;
	--space-8: 2rem;
	--space-12: 3rem;
	--space-16: 4rem;

	/* Border radius */
	--radius-md: 8px;
	--radius-lg: 12px;
	--radius-xl: 16px;

	/* Transitions */
	--ease-out: cubic-bezier(0.16, 1, 0.3, 1);
	--duration-normal: 250ms;
}

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

html {
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

body {
	font-family: var(--font-sans);
	font-size: 1rem;
	line-height: 1.6;
	color: var(--text-0);
	background-color: var(--surface-0);
	min-height: 100vh;
}

/* Warm gradient background */
body::before {
	content: "";
	position: fixed;
	inset: 0;
	background:
		radial-gradient(
			ellipse 80% 50% at 50% -20%,
			rgba(196, 149, 106, 0.08) 0%,
			transparent 50%
		),
		radial-gradient(
			ellipse 60% 40% at 100% 50%,
			rgba(161, 122, 82, 0.05) 0%,
			transparent 40%
		);
	pointer-events: none;
	z-index: -2;
}

/* Grain overlay */
.grain-overlay {
	position: fixed;
	inset: 0;
	background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
	opacity: 0.03;
	pointer-events: none;
	z-index: -1;
}

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

/* Focus styles */
:focus-visible {
	outline: 2px solid var(--accent-0);
	outline-offset: 2px;
}

/* Skip link - visible only on focus for keyboard users */
.skip-link {
	position: absolute;
	top: -100px;
	left: var(--space-4);
	z-index: 1000;
	padding: var(--space-3) var(--space-5);
	background: var(--accent-0);
	color: var(--surface-0);
	font-weight: 600;
	font-size: 0.875rem;
	border-radius: var(--radius-md);
	text-decoration: none;
	transition: top 0.2s ease-out;
}

.skip-link:focus {
	top: var(--space-4);
	outline: 3px solid var(--text-0);
	outline-offset: 2px;
}

/* ============================================================================
 * LAB PAGE LAYOUT
 * ============================================================================ */

.lab-page {
	max-width: 900px;
	margin-inline: auto;
	padding: var(--space-8) var(--space-6);
	min-height: calc(100vh - 80px);
}

/* ============================================================================
 * LAB HEADER
 * ============================================================================ */

.lab-header {
	margin-block-end: var(--space-12);
}

.back-link {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	font-size: 0.875rem;
	color: var(--text-muted);
	margin-block-end: var(--space-6);
	transition: color var(--duration-normal) var(--ease-out);
}

.back-link:hover {
	color: var(--accent-0);
}

.back-link:focus-visible {
	color: var(--accent-0);
	outline: 3px solid var(--accent-0);
	outline-offset: 4px;
	border-radius: var(--radius-md);
}

.back-link svg {
	width: 18px;
	height: 18px;
}

.lab-title {
	font-size: clamp(2rem, 5vw, 3rem);
	font-weight: 600;
	letter-spacing: -0.02em;
	margin-block-end: var(--space-3);
	background: linear-gradient(135deg, var(--text-0) 0%, var(--text-1) 100%);
	background-clip: text;
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
}

.lab-subtitle {
	font-size: 1.125rem;
	color: var(--text-1);
}

/* ============================================================================
 * LAB GRID
 * ============================================================================ */

.lab-grid {
	display: flex;
	flex-direction: column;
	gap: var(--space-5);
}

/* ============================================================================
 * LAB ITEM
 * ============================================================================ */

.lab-item {
	background: var(--surface-1);
	border: 1px solid var(--glass-stroke);
	border-radius: var(--radius-xl);
	overflow: hidden;
	transition:
		border-color var(--duration-normal) var(--ease-out),
		box-shadow var(--duration-normal) var(--ease-out),
		transform var(--duration-normal) var(--ease-out);
}

.lab-item:hover {
	border-color: var(--accent-0);
	box-shadow:
		var(--shadow-md),
		0 0 40px rgba(196, 149, 106, 0.1);
	transform: translateY(-2px);
}

.lab-item:focus-within {
	border-color: var(--accent-0);
	box-shadow:
		var(--shadow-md),
		0 0 40px rgba(196, 149, 106, 0.15);
	transform: translateY(-2px);
}

.lab-item-link:focus-visible {
	outline: 3px solid var(--accent-0);
	outline-offset: -3px;
	border-radius: var(--radius-xl);
}

.lab-item-link {
	display: grid;
	grid-template-columns: auto 1fr auto;
	align-items: center;
	gap: var(--space-5);
	padding: var(--space-6);
}

@media (max-width: 600px) {
	.lab-item-link {
		grid-template-columns: 1fr;
		gap: var(--space-4);
	}

	.lab-item-arrow {
		display: none;
	}
}

.lab-item-icon {
	width: 64px;
	height: 64px;
	padding: var(--space-4);
	background: var(--surface-2);
	border-radius: var(--radius-lg);
	color: var(--accent-0);
	transition: background-color var(--duration-normal) var(--ease-out);
}

.lab-item:hover .lab-item-icon {
	background: var(--accent-0);
	color: var(--surface-0);
}

.lab-item-icon svg {
	width: 100%;
	height: 100%;
}

.lab-item-content {
	min-width: 0;
}

.lab-item-title {
	font-size: 1.25rem;
	font-weight: 600;
	color: var(--text-0);
	margin-block-end: var(--space-2);
}

.lab-item-description {
	font-size: 0.9375rem;
	color: var(--text-1);
	line-height: 1.6;
	margin-block-end: var(--space-3);
}

.lab-item-tags {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-2);
}

.tag {
	font-family: var(--font-mono);
	font-size: 0.6875rem;
	color: var(--accent-0);
	background: rgba(196, 149, 106, 0.1);
	padding: var(--space-2) var(--space-3);
	border-radius: 9999px;
	text-transform: uppercase;
	letter-spacing: 0.05em;
}

.lab-item-arrow {
	width: 24px;
	height: 24px;
	color: var(--text-muted);
	transition: transform var(--duration-normal) var(--ease-out);
}

.lab-item:hover .lab-item-arrow {
	color: var(--accent-0);
	transform: translateX(4px);
}

.lab-item-arrow svg {
	width: 100%;
	height: 100%;
}

/* ============================================================================
 * FOOTER
 * ============================================================================ */

.lab-footer {
	padding: var(--space-8) var(--space-6);
	text-align: center;
}

.lab-footer p {
	font-size: 0.875rem;
	color: var(--text-muted);
}

/* ============================================================================
 * REDUCED MOTION
 * ============================================================================ */

@media (prefers-reduced-motion: reduce) {
	.lab-item,
	.lab-item-icon,
	.lab-item-arrow,
	.back-link {
		transition: none;
	}

	.lab-item:hover {
		transform: none;
	}

	.lab-item:hover .lab-item-arrow {
		transform: none;
	}
}