/* D7460N Architecture - CSS-First, Zero-Dependency */
/* Holy Grail Layout using CSS Grid */

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

:root {
	--color-primary: #667eea;
	--color-primary-dark: #764ba2;
	--color-bg: #f5f5f5;
	--color-surface: #ffffff;
	--color-text: #333333;
	--color-text-light: #666666;
	--color-border: #e0e0e0;
	--color-shadow: rgba(0, 0, 0, 0.1);
	--spacing-xs: 0.5rem;
	--spacing-sm: 1rem;
	--spacing-md: 1.5rem;
	--spacing-lg: 2rem;
	--spacing-xl: 3rem;
	--radius: 8px;
	--transition: 0.2s ease;
}

@media (prefers-color-scheme: dark) {
	:root {
		--color-bg: #1a1a1a;
		--color-surface: #2d2d2d;
		--color-text: #e0e0e0;
		--color-text-light: #a0a0a0;
		--color-border: #404040;
		--color-shadow: rgba(0, 0, 0, 0.3);
	}
}

body {
	font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
	line-height: 1.6;
	color: var(--color-text);
	background: var(--color-bg);
}

/* Holy Grail Layout */
app-container {
	display: grid;
	grid-template-columns: minmax(200px, 1fr) minmax(300px, 3fr) minmax(200px, 1fr);
	grid-template-rows: auto auto 1fr auto;
	min-height: 100vh;
	max-width: 1400px;
	margin: 0 auto;
}

/* Header spans all columns */
header {
	grid-column: 1 / -1;
	grid-row: 1;
	background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
	color: white;
	padding: var(--spacing-lg);
	text-align: center;
	box-shadow: 0 2px 10px var(--color-shadow);
}

app-logo {
	display: block;
	font-size: 2rem;
	font-weight: 600;
	margin-block-end: var(--spacing-xs);
}

app-tagline {
	display: block;
	opacity: 0.9;
	font-size: 1rem;
}

/* Navigation spans all columns */
nav {
	grid-column: 1 / -1;
	grid-row: 2;
	display: grid;
	grid-auto-flow: column;
	grid-auto-columns: 1fr;
	background: var(--color-surface);
	border-block-end: 1px solid var(--color-border);
	gap: 1px;
	background: var(--color-border);
}

nav label {
	display: grid;
	place-items: center;
	padding: var(--spacing-sm);
	background: var(--color-surface);
	cursor: pointer;
	transition: background var(--transition);
	text-align: center;
}

nav label:hover {
	background: var(--color-bg);
}

/* Hide radio buttons - they're CSS state hooks */
nav input[type="radio"] {
	position: absolute;
	opacity: 0;
	pointer-events: none;
}

/* Active nav state via :checked */
nav label:has(input:checked) {
	background: var(--color-primary);
	color: white;
	font-weight: 600;
}

/* Main content area */
main {
	grid-column: 2;
	grid-row: 3;
	padding: var(--spacing-lg);
	overflow-y: auto;
}

/* Aside - hidden by default, shown when document is selected */
aside {
	grid-column: 3;
	grid-row: 3;
	padding: var(--spacing-lg);
	background: var(--color-surface);
	border-inline-start: 1px solid var(--color-border);
	overflow-y: auto;
	display: none;
}

/* Show aside when it has content */
aside:has(app-document-title:not(:empty)) {
	display: block;
}

/* Footer spans all columns */
footer {
	grid-column: 1 / -1;
	grid-row: 4;
	text-align: center;
	padding: var(--spacing-md);
	background: var(--color-surface);
	border-block-start: 1px solid var(--color-border);
	color: var(--color-text-light);
	font-size: 0.875rem;
}

/* Article and Sections */
article {
	display: grid;
	gap: var(--spacing-lg);
}

section {
	background: var(--color-surface);
	padding: var(--spacing-lg);
	border-radius: var(--radius);
	box-shadow: 0 2px 4px var(--color-shadow);
}

/* Category Display */
app-category-icon {
	display: block;
	font-size: 3rem;
	margin-block-end: var(--spacing-sm);
}

app-category-name {
	display: block;
	font-size: 1.5rem;
	font-weight: 600;
	color: var(--color-primary);
	margin-block-end: var(--spacing-xs);
}

app-category-description {
	display: block;
	color: var(--color-text-light);
}

/* Document List */
app-document-list {
	display: block;
}

app-document-list ol {
	list-style: none;
	display: grid;
	gap: var(--spacing-sm);
}

app-document-list li {
	display: grid;
	padding: var(--spacing-md);
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	cursor: pointer;
	transition: all var(--transition);
}

app-document-list li:hover {
	transform: translateY(-2px);
	box-shadow: 0 4px 12px var(--color-shadow);
	border-color: var(--color-primary);
}

/* Document elements within list items */
document-title {
	display: block;
	font-weight: 600;
	font-size: 1.1rem;
	color: var(--color-primary);
	margin-block-end: var(--spacing-xs);
}

document-summary {
	display: block;
	color: var(--color-text-light);
	font-size: 0.9rem;
	margin-block-end: var(--spacing-sm);
}

document-tags {
	display: flex;
	flex-wrap: wrap;
	gap: var(--spacing-xs);
}

document-tag {
	display: inline-block;
	background: #e0e7ff;
	color: var(--color-primary);
	padding: 0.2rem 0.6rem;
	border-radius: 12px;
	font-size: 0.75rem;
}

/* Document Detail in Aside */
app-document-detail {
	display: grid;
	gap: var(--spacing-md);
}

app-document-title {
	display: block;
	font-size: 1.5rem;
	font-weight: 600;
	color: var(--color-primary);
}

app-document-category {
	display: block;
	font-size: 0.875rem;
	color: var(--color-text-light);
	text-transform: uppercase;
	letter-spacing: 0.05em;
}

app-document-summary {
	display: block;
	font-style: italic;
	color: var(--color-text-light);
	padding: var(--spacing-sm);
	background: var(--color-bg);
	border-radius: var(--radius);
}

app-document-content {
	display: block;
	line-height: 1.8;
}

/* HTML content styling */
app-document-content h1,
app-document-content h2,
app-document-content h3 {
	margin-block-start: var(--spacing-md);
	margin-block-end: var(--spacing-sm);
	color: var(--color-text);
}

app-document-content h1 {
	font-size: 1.5rem;
}

app-document-content h2 {
	font-size: 1.25rem;
}

app-document-content h3 {
	font-size: 1.1rem;
}

app-document-content p {
	margin-block-end: var(--spacing-sm);
}

app-document-content ul,
app-document-content ol {
	margin-block-end: var(--spacing-sm);
	padding-inline-start: var(--spacing-lg);
}

app-document-content li {
	margin-block-end: var(--spacing-xs);
}

app-document-content blockquote {
	padding: var(--spacing-md);
	margin-block: var(--spacing-md);
	background: var(--color-bg);
	border-inline-start: 4px solid var(--color-primary);
	border-radius: var(--radius);
	font-style: italic;
}

app-document-content table {
	width: 100%;
	border-collapse: collapse;
	margin-block: var(--spacing-md);
}

app-document-content th,
app-document-content td {
	padding: var(--spacing-sm);
	border: 1px solid var(--color-border);
	text-align: start;
}

app-document-content th {
	background: var(--color-bg);
	font-weight: 600;
}

app-document-tags,
app-document-audience {
	display: block;
}

app-document-tags ol,
app-document-audience ol {
	list-style: none;
	display: flex;
	flex-wrap: wrap;
	gap: var(--spacing-xs);
}

app-document-tags li,
app-document-audience li {
	display: inline-block;
	background: #e0e7ff;
	color: var(--color-primary);
	padding: 0.3rem 0.8rem;
	border-radius: 12px;
	font-size: 0.8rem;
}

/* Loading states using :empty pseudo-class */
app-document-list:empty::before {
	content: 'Loading documents...';
	display: block;
	text-align: center;
	padding: var(--spacing-xl);
	color: var(--color-text-light);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
	app-container {
		grid-template-columns: 1fr 3fr;
	}

	aside {
		grid-column: 1 / -1;
		grid-row: 4;
		border-inline-start: none;
		border-block-start: 1px solid var(--color-border);
	}

	footer {
		grid-row: 5;
	}
}

@media (max-width: 768px) {
	app-container {
		grid-template-columns: 1fr;
	}

	nav {
		grid-auto-flow: row;
	}

	main,
	aside {
		padding: var(--spacing-md);
	}
}