/* ==========================================================================
   Pillar Page Template Styles
   Long-form content with sticky sidebar table of contents.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Header
   -------------------------------------------------------------------------- */
.section--pillar-header {
	padding: calc(var(--header-height, 72px) + var(--space-2xl, 3rem)) 0 var(--space-xl, 2rem);
	background: var(--color-bg-dark, #0a0a14);
	color: var(--color-text-on-dark, #f0f0ff);
}

.page-pillar .entry-title {
	font-size: clamp(2rem, 4vw, 3rem);
	font-weight: var(--weight-extrabold, 800);
	letter-spacing: -0.03em;
	line-height: 1.15;
	margin: 0 0 var(--space-md, 1rem);
	color: var(--color-text-on-dark, #f0f0ff);
}

.pillar-page__subtitle {
	font-size: var(--text-xl, 1.25rem);
	color: var(--color-text-on-dark-secondary, rgba(240, 240, 255, 0.75));
	max-width: 700px;
	line-height: 1.6;
	margin: 0 0 var(--space-lg, 1.5rem);
}

.pillar-page__meta {
	display: flex;
	align-items: center;
	gap: var(--space-sm, 0.5rem);
	font-size: var(--text-sm, 0.875rem);
	color: var(--color-text-on-dark-secondary, rgba(240, 240, 255, 0.75));
}

.pillar-page__separator {
	margin: 0 var(--space-xs, 0.25rem);
}

/* --------------------------------------------------------------------------
   2. Layout — 70/30 split
   -------------------------------------------------------------------------- */
.section--pillar-content {
	padding: var(--space-2xl, 3rem) 0;
	background: var(--color-bg-dark, #0a0a14);
}

.pillar-page__layout {
	display: grid;
	grid-template-columns: 1fr 280px;
	gap: var(--space-2xl, 3rem);
	align-items: start;
}

/* --------------------------------------------------------------------------
   3. Sidebar ToC — sticky
   -------------------------------------------------------------------------- */
.pillar-page__sidebar {
	order: -1;
}

.pillar-page__toc {
	position: sticky;
	top: calc(var(--header-height, 72px) + var(--space-xl, 2rem));
	max-height: calc(100vh - var(--header-height, 72px) - var(--space-3xl, 4rem));
	overflow-y: auto;
	background: rgba(28, 28, 48, 0.6);
	border: 1px solid rgba(0, 240, 255, 0.12);
	border-radius: var(--radius-lg, 12px);
	padding: var(--space-lg, 1.5rem);
	scrollbar-width: thin;
	scrollbar-color: rgba(0, 240, 255, 0.2) transparent;
}

.pillar-page__toc::-webkit-scrollbar {
	width: 4px;
}

.pillar-page__toc::-webkit-scrollbar-track {
	background: transparent;
}

.pillar-page__toc::-webkit-scrollbar-thumb {
	background: rgba(0, 240, 255, 0.2);
	border-radius: 2px;
}

.pillar-page__toc-details {
	margin: 0;
}

.pillar-page__toc-title {
	display: flex;
	align-items: center;
	justify-content: space-between;
	font-size: var(--text-sm, 0.875rem);
	font-weight: var(--weight-bold, 700);
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--color-neon-cyan, #00f0ff);
	cursor: pointer;
	list-style: none;
	padding-bottom: var(--space-md, 1rem);
	border-bottom: 1px solid rgba(0, 240, 255, 0.12);
	margin-bottom: var(--space-md, 1rem);
}

.pillar-page__toc-title::-webkit-details-marker {
	display: none;
}

.pillar-page__toc-list {
	list-style: none;
	padding: 0;
	margin: 0;
	counter-reset: toc-h2;
}

.pillar-page__toc-item {
	counter-increment: toc-h2;
}

.pillar-page__toc-item > a {
	display: block;
	padding: var(--space-xs, 0.25rem) 0;
	font-size: var(--text-sm, 0.875rem);
	font-weight: var(--weight-medium, 500);
	color: var(--color-text-on-dark-secondary, rgba(240, 240, 255, 0.75));
	text-decoration: none;
	border-left: 2px solid transparent;
	padding-left: var(--space-sm, 0.5rem);
	transition: color 150ms ease, border-color 150ms ease;
	line-height: 1.5;
}

.pillar-page__toc-item > a:hover {
	color: var(--color-neon-cyan, #00f0ff);
	border-left-color: var(--color-neon-cyan, #00f0ff);
}

.pillar-page__toc-sublist {
	list-style: none;
	padding: 0 0 0 var(--space-md, 1rem);
	margin: 0;
}

.pillar-page__toc-item--sub > a {
	font-size: 0.8125rem;
	font-weight: var(--weight-regular, 400);
	color: var(--color-text-on-dark-secondary, rgba(240, 240, 255, 0.55));
	padding: 2px 0 2px var(--space-sm, 0.5rem);
}

.pillar-page__toc-item--sub > a:hover {
	color: var(--color-neon-cyan, #00f0ff);
}

/* --------------------------------------------------------------------------
   4. Main Content
   -------------------------------------------------------------------------- */
.pillar-page__content {
	min-width: 0;
	color: var(--color-text-on-dark, #f0f0ff);
	line-height: 1.8;
	font-size: var(--text-base, 1rem);
}

.pillar-page__content h2 {
	font-size: var(--text-2xl, 1.5rem);
	font-weight: var(--weight-bold, 700);
	color: var(--color-text-on-dark, #f0f0ff);
	margin: var(--space-2xl, 3rem) 0 var(--space-md, 1rem);
	padding-top: var(--space-md, 1rem);
	border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.pillar-page__content h2:first-child {
	margin-top: 0;
	border-top: none;
	padding-top: 0;
}

.pillar-page__content h3 {
	font-size: var(--text-xl, 1.25rem);
	font-weight: var(--weight-semibold, 600);
	color: var(--color-text-on-dark, #f0f0ff);
	margin: var(--space-xl, 2rem) 0 var(--space-sm, 0.5rem);
}

.pillar-page__content p {
	margin: 0 0 var(--space-lg, 1.5rem);
	color: var(--color-text-on-dark-secondary, rgba(240, 240, 255, 0.85));
}

.pillar-page__content a {
	color: var(--color-neon-cyan, #00f0ff);
	text-decoration: underline;
	text-decoration-color: rgba(0, 240, 255, 0.3);
	text-underline-offset: 3px;
	transition: text-decoration-color 150ms ease;
}

.pillar-page__content a:hover {
	text-decoration-color: var(--color-neon-cyan, #00f0ff);
}

.pillar-page__content ul,
.pillar-page__content ol {
	margin: 0 0 var(--space-lg, 1.5rem);
	padding-left: var(--space-xl, 2rem);
	color: var(--color-text-on-dark-secondary, rgba(240, 240, 255, 0.85));
}

.pillar-page__content li {
	margin-bottom: var(--space-xs, 0.25rem);
}

.pillar-page__content blockquote {
	margin: var(--space-xl, 2rem) 0;
	padding: var(--space-lg, 1.5rem) var(--space-xl, 2rem);
	border-left: 3px solid var(--color-neon-cyan, #00f0ff);
	background: rgba(0, 240, 255, 0.04);
	border-radius: 0 var(--radius-md, 8px) var(--radius-md, 8px) 0;
	font-style: italic;
	color: var(--color-text-on-dark-secondary, rgba(240, 240, 255, 0.85));
}

.pillar-page__content img {
	max-width: 100%;
	height: auto;
	border-radius: var(--radius-md, 8px);
	margin: var(--space-lg, 1.5rem) 0;
}

/* --------------------------------------------------------------------------
   5. Related Articles
   -------------------------------------------------------------------------- */
.section--related-articles {
	padding: var(--space-2xl, 3rem) 0;
	background: var(--color-bg-dark, #0a0a14);
	border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.section--related-articles .section__title {
	color: var(--color-text-on-dark, #f0f0ff);
}

.section--related-articles .posts-grid {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: var(--space-lg, 1.5rem);
}

.section--related-articles .post-card {
	background: rgba(28, 28, 48, 0.5);
	border: 1px solid rgba(255, 255, 255, 0.06);
	border-radius: var(--radius-lg, 12px);
	overflow: hidden;
	transition: border-color 200ms ease, transform 200ms ease;
}

.section--related-articles .post-card:hover {
	border-color: rgba(0, 240, 255, 0.2);
	transform: translateY(-2px);
}

.section--related-articles .post-card__title a {
	color: var(--color-text-on-dark, #f0f0ff);
	text-decoration: none;
}

.section--related-articles .post-card__title a:hover {
	color: var(--color-neon-cyan, #00f0ff);
}

.section--related-articles .post-card__excerpt {
	color: var(--color-text-on-dark-secondary, rgba(240, 240, 255, 0.65));
	font-size: var(--text-sm, 0.875rem);
}

/* --------------------------------------------------------------------------
   6. Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
	.pillar-page__layout {
		grid-template-columns: 1fr 240px;
		gap: var(--space-xl, 2rem);
	}
}

@media (max-width: 768px) {
	.pillar-page__layout {
		grid-template-columns: 1fr;
		gap: 0;
	}

	.pillar-page__sidebar {
		order: 0;
		margin-bottom: var(--space-xl, 2rem);
	}

	.pillar-page__toc {
		position: static;
		max-height: none;
	}

	.pillar-page__toc-details:not([open]) .pillar-page__toc-list {
		display: none;
	}

	.pillar-page__toc-title {
		margin-bottom: 0;
		padding-bottom: 0;
		border-bottom: none;
	}

	.pillar-page__toc-title::after {
		content: '';
		display: inline-block;
		width: 8px;
		height: 8px;
		border-right: 2px solid currentColor;
		border-bottom: 2px solid currentColor;
		transform: rotate(45deg);
		transition: transform 200ms ease;
		margin-left: auto;
	}

	.pillar-page__toc-details[open] .pillar-page__toc-title::after {
		transform: rotate(-135deg);
	}

	.pillar-page__toc-details[open] .pillar-page__toc-title {
		margin-bottom: var(--space-md, 1rem);
		padding-bottom: var(--space-md, 1rem);
		border-bottom: 1px solid rgba(0, 240, 255, 0.12);
	}

	.section--related-articles .posts-grid {
		grid-template-columns: repeat(2, 1fr);
	}

	.section--pillar-header {
		padding-top: calc(var(--header-height, 60px) + var(--space-xl, 2rem));
	}
}

@media (max-width: 480px) {
	.section--related-articles .posts-grid {
		grid-template-columns: 1fr;
	}
}