/**
 * Biologica Premium Page — layout shell and grid.
 *
 * Scoped to .ba-premium-context only. Loaded exclusively on page-biologica.php.
 *
 * @package BiologicaPress
 */

/* —— Design tokens —— */
.ba-premium-context {
	--ba-p-font-sans: var(--ba-font-body);
	--ba-p-font-serif: var(--ba-font-body);
	--ba-p-primary: #0b4f6c;
	--ba-p-primary-dark: #083549;
	--ba-p-accent: #e8f4f8;
	--ba-p-accent-strong: #c5e4ef;
	--ba-p-border: #dbe4ea;
	--ba-p-border-soft: #edf2f6;
	--ba-p-bg: #f6f9fb;
	--ba-p-surface: #ffffff;
	--ba-p-text: #102a43;
	--ba-p-muted: #5c7080;
	--ba-p-radius: 14px;
	--ba-p-radius-sm: 10px;
	--ba-p-shadow: 0 1px 2px rgba(16, 42, 67, 0.04), 0 8px 24px rgba(16, 42, 67, 0.06);
	--ba-p-max: 1280px;
	--ba-p-gutter: clamp(1rem, 3vw, 1.75rem);
	--ba-p-col-left: 22%;
	--ba-p-col-main: 56%;
	--ba-p-col-right: 22%;
	--ba-p-scroll-offset: 88px;
	background-color: var(--ba-p-bg);
	font-family: var(--ba-p-font-sans);
}

.ba-premium-context .ba-premium-page-wrap {
	width: 100%;
	background: var(--ba-p-bg);
}

.ba-premium-context .ba-premium-container {
	width: 100%;
	max-width: var(--ba-p-max);
	margin-inline: auto;
	padding-inline: var(--ba-p-gutter);
	box-sizing: border-box;
}

.ba-premium-context .ba-premium-doc {
	color: var(--ba-p-text);
}

/* —— Reading progress —— */
.ba-premium-context .ba-premium-progress {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	height: 3px;
	z-index: 9999;
	background: transparent;
	pointer-events: none;
}

.ba-premium-context .ba-premium-progress__bar {
	display: block;
	width: 0;
	height: 100%;
	background: linear-gradient(90deg, var(--ba-p-primary) 0%, #1a8fb0 100%);
	transition: width 0.08s linear;
}

/* —— Breadcrumb —— */
.ba-premium-context .ba-premium-breadcrumb {
	background: var(--ba-p-surface);
	border-bottom: 1px solid var(--ba-p-border-soft);
	padding-block: 0.75rem;
}

.ba-premium-context .ba-premium-breadcrumb .ba-breadcrumbs {
	margin: 0;
	font-size: 0.8125rem;
	color: var(--ba-p-muted);
}

.ba-premium-context .ba-premium-breadcrumb .ba-breadcrumbs a {
	color: var(--ba-p-muted);
	text-decoration: none;
}

.ba-premium-context .ba-premium-breadcrumb .ba-breadcrumbs a:hover,
.ba-premium-context .ba-premium-breadcrumb .ba-breadcrumbs a:focus-visible {
	color: var(--ba-p-primary);
}

/* —— Hero —— */
.ba-premium-context .ba-premium-hero {
	background:
		radial-gradient(circle at 100% 0%, rgba(26, 143, 176, 0.12) 0%, transparent 42%),
		linear-gradient(180deg, var(--ba-p-surface) 0%, var(--ba-p-bg) 100%);
	border-bottom: 1px solid var(--ba-p-border-soft);
	padding-block: clamp(2rem, 5vw, 3.25rem);
}

.ba-premium-context .ba-premium-hero__inner {
	display: grid;
	gap: clamp(1.25rem, 3vw, 2rem);
	align-items: center;
}

.ba-premium-context .ba-premium-hero__eyebrow {
	margin: 0 0 0.5rem;
	font-size: 0.75rem;
	font-weight: 600;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--ba-p-primary);
}

.ba-premium-context .ba-premium-hero__title {
	margin: 0;
	font-family: var(--ba-p-font-serif);
	font-size: clamp(2rem, 4.5vw, 3rem);
	font-weight: 600;
	line-height: 1.12;
	letter-spacing: -0.02em;
	color: var(--ba-p-text);
}

.ba-premium-context .ba-premium-hero__lead {
	margin: 0.85rem 0 0;
	max-width: 46rem;
	font-size: clamp(1.0625rem, 2vw, 1.25rem);
	line-height: 1.65;
	color: var(--ba-p-muted);
}

.ba-premium-context .ba-premium-hero__meta {
	display: flex;
	flex-wrap: wrap;
	gap: 1rem 1.5rem;
	margin: 1.25rem 0 0;
	padding: 0;
	list-style: none;
}

.ba-premium-context .ba-premium-hero__meta-item {
	display: flex;
	flex-direction: column;
	gap: 0.15rem;
}

.ba-premium-context .ba-premium-hero__meta-label {
	font-size: 0.6875rem;
	font-weight: 600;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--ba-p-muted);
}

.ba-premium-context .ba-premium-hero__meta-value {
	font-size: 0.875rem;
	font-weight: 500;
	color: var(--ba-p-text);
}

.ba-premium-context .ba-premium-hero__media {
	margin: 0;
	overflow: hidden;
	border: 1px solid var(--ba-p-border);
	border-radius: var(--ba-p-radius);
	box-shadow: var(--ba-p-shadow);
}

.ba-premium-context .ba-premium-hero__image {
	display: block;
	width: 100%;
	height: auto;
	object-fit: cover;
}

@media (min-width: 900px) {
	.ba-premium-context .ba-premium-hero__inner {
		grid-template-columns: 1fr minmax(240px, 340px);
	}
}

/* —— Three-column shell —— */
.ba-premium-context .ba-premium-shell {
	padding-block: clamp(1.5rem, 4vw, 2.5rem);
}

.ba-premium-context .ba-premium-grid {
	display: grid;
	grid-template-columns: var(--ba-p-col-left) var(--ba-p-col-main) var(--ba-p-col-right);
	gap: clamp(1rem, 2.5vw, 2rem);
	align-items: start;
}

.ba-premium-context .ba-premium-grid__main {
	min-width: 0;
}

.ba-premium-context .ba-premium-rail {
	min-width: 0;
}

.ba-premium-context .ba-premium-rail__sticky {
	position: sticky;
	top: calc(var(--ba-p-scroll-offset) + 0.5rem);
	max-height: calc(100vh - var(--ba-p-scroll-offset) - 1rem);
	overflow-y: auto;
	overscroll-behavior: contain;
	scrollbar-width: thin;
}

/* —— Content card —— */
.ba-premium-context .ba-premium-card {
	background: var(--ba-p-surface);
	border: 1px solid var(--ba-p-border);
	border-radius: var(--ba-p-radius);
	box-shadow: var(--ba-p-shadow);
	overflow: hidden;
}

.ba-premium-context .ba-premium-card__body {
	padding: clamp(1.25rem, 3vw, 2.25rem);
}

/* Editorial prose typography: assets/css/editorial-prose.css (.ba-editorial-prose) */

.ba-premium-context .ba-premium-card__pages {
	margin-top: 2rem;
	padding-top: 1.25rem;
	border-top: 1px solid var(--ba-p-border-soft);
	font-family: var(--ba-p-font-sans);
	font-size: 0.875rem;
}

.ba-premium-context .ba-premium-card__pages-label {
	font-weight: 600;
	margin-right: 0.5rem;
}

.ba-premium-context .ba-premium-card__page-link {
	display: inline-block;
	margin: 0.25rem 0.35rem 0.25rem 0;
	padding: 0.25rem 0.625rem;
	border: 1px solid var(--ba-p-border);
	border-radius: 6px;
	text-decoration: none;
	color: var(--ba-p-text);
}

.ba-premium-context .ba-premium-card__page-link:hover,
.ba-premium-context .ba-premium-card__page-link:focus-visible {
	border-color: var(--ba-p-primary);
	color: var(--ba-p-primary);
}

/* —— Prev / Next pager —— */
.ba-premium-context .ba-premium-pager {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
	margin-top: 1.25rem;
}

.ba-premium-context .ba-premium-pager__link {
	display: flex;
	flex-direction: column;
	gap: 0.35rem;
	padding: 1rem 1.15rem;
	border: 1px solid var(--ba-p-border);
	border-radius: var(--ba-p-radius-sm);
	background: var(--ba-p-surface);
	text-decoration: none;
	transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.ba-premium-context .ba-premium-pager__link:hover,
.ba-premium-context .ba-premium-pager__link:focus-visible {
	border-color: var(--ba-p-primary);
	box-shadow: var(--ba-p-shadow);
}

.ba-premium-context .ba-premium-pager__link--next {
	text-align: right;
	align-items: flex-end;
}

.ba-premium-context .ba-premium-pager__label {
	font-size: 0.75rem;
	font-weight: 600;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--ba-p-muted);
}

.ba-premium-context .ba-premium-pager__title {
	font-family: var(--ba-p-font-sans);
	font-size: 0.9375rem;
	font-weight: 600;
	color: var(--ba-p-text);
	line-height: 1.35;
}

.ba-premium-context .ba-premium-pager__spacer {
	display: block;
}

@media (max-width: 640px) {
	.ba-premium-context .ba-premium-pager {
		grid-template-columns: 1fr;
	}
}

/* —— Left TOC rail —— */
.ba-premium-context .ba-premium-toc {
	background: var(--ba-p-surface);
	border: 1px solid var(--ba-p-border);
	border-radius: var(--ba-p-radius-sm);
	padding: 0.85rem;
}

.ba-premium-context .ba-premium-toc__heading {
	margin: 0 0 0.65rem;
	font-family: var(--ba-p-font-sans);
	font-size: 0.8125rem;
	font-weight: 700;
	letter-spacing: 0.05em;
	text-transform: uppercase;
	color: var(--ba-p-text);
}

.ba-premium-context .ba-premium-toc__toggle {
	display: none;
	width: 100%;
	align-items: center;
	justify-content: space-between;
	gap: 0.5rem;
	padding: 0;
	border: 0;
	background: transparent;
	font-family: var(--ba-p-font-sans);
	font-size: 0.8125rem;
	font-weight: 700;
	letter-spacing: 0.05em;
	text-transform: uppercase;
	color: var(--ba-p-text);
	cursor: pointer;
}

.ba-premium-context .ba-premium-toc__toggle-icon {
	flex-shrink: 0;
	transition: transform 0.15s ease;
}

.ba-premium-context .ba-premium-toc.is-collapsed .ba-premium-toc__toggle-icon {
	transform: rotate(-90deg);
}

.ba-premium-context .ba-premium-toc__list {
	margin: 0;
	padding: 0;
	list-style: none;
}

.ba-premium-context .ba-premium-toc__item + .ba-premium-toc__item {
	margin-top: 0.15rem;
}

.ba-premium-context .ba-premium-toc__link {
	display: block;
	padding: 0.35rem 0.5rem;
	border-left: 2px solid transparent;
	border-radius: 0 6px 6px 0;
	font-family: var(--ba-p-font-sans);
	font-size: 0.8125rem;
	line-height: 1.45;
	color: var(--ba-p-muted);
	text-decoration: none;
	transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.ba-premium-context .ba-premium-toc__item--level-3 .ba-premium-toc__link {
	padding-left: 1rem;
	font-size: 0.78125rem;
}

.ba-premium-context .ba-premium-toc__link:hover,
.ba-premium-context .ba-premium-toc__link:focus-visible {
	color: var(--ba-p-primary);
	background: var(--ba-p-accent);
}

.ba-premium-context .ba-premium-toc__link.is-active {
	color: var(--ba-p-primary);
	border-left-color: var(--ba-p-primary);
	background: var(--ba-p-accent);
	font-weight: 600;
}

.ba-premium-context .ba-premium-toc__empty {
	margin: 0;
	font-family: var(--ba-p-font-sans);
	font-size: 0.8125rem;
	line-height: 1.5;
	color: var(--ba-p-muted);
}

/* —— Right panels —— */
.ba-premium-context .ba-premium-panel {
	background: var(--ba-p-surface);
	border: 1px solid var(--ba-p-border);
	border-radius: var(--ba-p-radius-sm);
	padding: 1rem 1.05rem;
}

.ba-premium-context .ba-premium-panel + .ba-premium-panel {
	margin-top: 0.85rem;
}

.ba-premium-context .ba-premium-panel__title {
	margin: 0 0 0.75rem;
	font-family: var(--ba-p-font-sans);
	font-size: 0.8125rem;
	font-weight: 700;
	letter-spacing: 0.05em;
	text-transform: uppercase;
	color: var(--ba-p-text);
}

.ba-premium-context .ba-premium-meta {
	margin: 0;
}

.ba-premium-context .ba-premium-meta__row + .ba-premium-meta__row {
	margin-top: 0.65rem;
	padding-top: 0.65rem;
	border-top: 1px solid var(--ba-p-border-soft);
}

.ba-premium-context .ba-premium-meta__label {
	margin: 0;
	font-size: 0.75rem;
	font-weight: 600;
	color: var(--ba-p-muted);
}

.ba-premium-context .ba-premium-meta__value {
	margin: 0.15rem 0 0;
	font-size: 0.875rem;
	font-weight: 500;
	color: var(--ba-p-text);
}

.ba-premium-context .ba-premium-contact__line {
	margin: 0;
}

.ba-premium-context .ba-premium-contact__line + .ba-premium-contact__line {
	margin-top: 0.65rem;
}

.ba-premium-context .ba-premium-contact__link {
	font-size: 0.875rem;
	color: var(--ba-p-primary);
	text-decoration: none;
	word-break: break-word;
}

.ba-premium-context .ba-premium-contact__link:hover,
.ba-premium-context .ba-premium-contact__link:focus-visible {
	text-decoration: underline;
}

.ba-premium-context .ba-premium-contact__button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.55rem 0.85rem;
	border-radius: 8px;
	background: var(--ba-p-accent);
	color: var(--ba-p-primary-dark);
	font-size: 0.8125rem;
	font-weight: 600;
	text-decoration: none;
}

.ba-premium-context .ba-premium-contact__button:hover,
.ba-premium-context .ba-premium-contact__button:focus-visible {
	background: var(--ba-p-accent-strong);
}

.ba-premium-context .ba-premium-download {
	display: flex;
	flex-direction: column;
	gap: 0.2rem;
	padding: 0.75rem 0.85rem;
	border: 1px dashed var(--ba-p-border);
	border-radius: 8px;
	text-decoration: none;
	transition: border-color 0.15s ease, background-color 0.15s ease;
}

.ba-premium-context .ba-premium-download:hover,
.ba-premium-context .ba-premium-download:focus-visible {
	border-color: var(--ba-p-primary);
	background: var(--ba-p-accent);
}

.ba-premium-context .ba-premium-download__label {
	font-size: 0.875rem;
	font-weight: 600;
	color: var(--ba-p-primary);
}

.ba-premium-context .ba-premium-download__hint {
	font-size: 0.75rem;
	color: var(--ba-p-muted);
}

.ba-premium-context .ba-premium-related {
	margin: 0;
	padding: 0;
	list-style: none;
}

.ba-premium-context .ba-premium-related__item + .ba-premium-related__item {
	margin-top: 0.35rem;
}

.ba-premium-context .ba-premium-related__link {
	display: block;
	padding: 0.4rem 0.45rem;
	border-radius: 6px;
	font-size: 0.8125rem;
	line-height: 1.4;
	color: var(--ba-p-text);
	text-decoration: none;
}

.ba-premium-context .ba-premium-related__link:hover,
.ba-premium-context .ba-premium-related__link:focus-visible {
	background: var(--ba-p-accent);
	color: var(--ba-p-primary);
}

/* —— Footer CTA —— */
.ba-premium-context .ba-premium-footer-cta {
	margin-top: clamp(1rem, 3vw, 2rem);
	padding-block: clamp(2rem, 4vw, 3rem);
	background:
		linear-gradient(135deg, var(--ba-p-primary) 0%, var(--ba-p-primary-dark) 100%);
	color: #fff;
}

.ba-premium-context .ba-premium-footer-cta__inner {
	display: flex;
	flex-direction: column;
	gap: 1.25rem;
	align-items: flex-start;
}

.ba-premium-context .ba-premium-footer-cta__title {
	margin: 0;
	font-family: var(--ba-p-font-serif);
	font-size: clamp(1.375rem, 2.5vw, 1.875rem);
	font-weight: 600;
	line-height: 1.2;
}

.ba-premium-context .ba-premium-footer-cta__text {
	margin: 0.65rem 0 0;
	max-width: 42rem;
	font-size: 1rem;
	line-height: 1.6;
	color: rgba(255, 255, 255, 0.88);
}

.ba-premium-context .ba-premium-footer-cta__button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.8rem 1.35rem;
	border-radius: 10px;
	background: #fff;
	color: var(--ba-p-primary-dark);
	font-size: 0.9375rem;
	font-weight: 600;
	text-decoration: none;
	white-space: nowrap;
	transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.ba-premium-context .ba-premium-footer-cta__button:hover,
.ba-premium-context .ba-premium-footer-cta__button:focus-visible {
	transform: translateY(-1px);
	box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
	color: var(--ba-p-primary-dark);
}

@media (min-width: 768px) {
	.ba-premium-context .ba-premium-footer-cta__inner {
		flex-direction: row;
		align-items: center;
		justify-content: space-between;
		gap: 2rem;
	}
}

/* —— Tablet: collapse TOC, expand content —— */
@media (max-width: 1023px) {
	.ba-premium-context {
		--ba-p-col-left: 1fr;
		--ba-p-col-main: 1fr;
		--ba-p-col-right: 1fr;
	}

	.ba-premium-context .ba-premium-grid {
		grid-template-columns: 1fr;
	}

	.ba-premium-context .ba-premium-rail--left {
		order: 1;
	}

	.ba-premium-context .ba-premium-grid__main {
		order: 2;
	}

	.ba-premium-context .ba-premium-rail--right {
		order: 3;
	}

	.ba-premium-context .ba-premium-rail__sticky {
		position: static;
		max-height: none;
		overflow: visible;
	}

	.ba-premium-context .ba-premium-toc__heading {
		display: none;
	}

	.ba-premium-context .ba-premium-toc__toggle {
		display: flex;
		margin-bottom: 0.65rem;
	}

	.ba-premium-context .ba-premium-toc.is-collapsed .ba-premium-toc__nav,
	.ba-premium-context .ba-premium-toc.is-collapsed .ba-premium-toc__empty {
		display: none;
	}
}

/* —— Smooth scrolling (premium pages only) —— */
.ba-premium-context {
	scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
	.ba-premium-context {
		scroll-behavior: auto;
	}

	.ba-premium-context .ba-premium-progress__bar {
		transition: none;
	}
}