/**
 * Age of Dinosaurs — Theme Layout & Container Foundation
 *
 * Establishes theme-level layout primitives, skip link, main content container,
 * responsive grids, and header/footer structural shells.
 * Consumes design tokens from tokens.css.
 *
 * @package AgeOfDinosaurs
 */

/* ==========================================================================
   1. Accessible Skip Link
   WCAG 2.2 AA requirement: Visible when keyboard focused.
   ========================================================================== */
.skip-link {
	position: absolute;
	top: -9999px;
	left: var(--space-md);
	z-index: 100000;
	padding: var(--space-sm) var(--space-lg);
	background-color: var(--color-bg-surface);
	color: var(--color-text-primary);
	border: 2px solid var(--color-focus-ring);
	border-radius: var(--radius-md);
	font-family: var(--font-family-body);
	font-size: var(--font-size-small);
	font-weight: var(--font-weight-bold);
	text-decoration: none;
	box-shadow: var(--shadow-md);
	transition: top var(--motion-duration-fast) var(--motion-ease-standard);
}

.skip-link:focus,
.skip-link:focus-visible {
	top: var(--space-md);
	outline: var(--focus-ring-width) solid var(--focus-ring-color);
	outline-offset: var(--focus-ring-offset);
}

/* ==========================================================================
   2. Main Document Shell
   ========================================================================== */
.site-wrapper {
	display: flex;
	flex-direction: column;
	min-height: 100vh;
}

.site-main {
	flex: 1 0 auto;
	width: 100%;
	outline: none;
	margin-top: 0;
	margin-block-start: 0;
	padding-top: 0;
	scroll-margin-top: 100px;
}

body .site-main,
.site-wrapper > .site-main,
main.site-main {
	margin-top: 0;
	margin-block-start: 0;
	padding-top: 0;
}

/* Fallback top clearance for generic content templates (404, index fallback) */
.site-main > :first-child:not(.hero):not(.search-experience):not(.directory-experience):not(.stories-archive):not(.timeline-pillar-experience):not(.compare-experience):not(.learn-hub-experience):not(.dinosaur-profile):not(.single-story) {
	padding-top: calc(var(--nav-height, 66px) + var(--nav-top-offset, 14px) + 2rem);
}

/* ==========================================================================
   3. Container System & Layout Primitives
   ========================================================================== */
/* Standard Content Container (Max 1200px) */
.container {
	width: 100%;
	max-width: var(--layout-content-max);
	margin-left: auto;
	margin-right: auto;
	padding-left: var(--layout-page-gutter);
	padding-right: var(--layout-page-gutter);
}

/* Wide Container for Grids, Directories & Showcase Sections (Max 1360px) */
.container--wide {
	width: 100%;
	max-width: var(--layout-wide-max);
	margin-left: auto;
	margin-right: auto;
	padding-left: var(--layout-page-gutter);
	padding-right: var(--layout-page-gutter);
}

/* Reading Container for Longform Stories & Biographies (Max 720px) */
.container--reading {
	width: 100%;
	max-width: var(--layout-reading-max);
	margin-left: auto;
	margin-right: auto;
	padding-left: var(--layout-page-gutter);
	padding-right: var(--layout-page-gutter);
}

/* Reusable Section Wrapper */
.section {
	width: 100%;
	padding-top: var(--layout-section-spacing);
	padding-bottom: var(--layout-section-spacing);
}

.section--compact {
	padding-top: calc(var(--layout-section-spacing) * 0.5);
	padding-bottom: calc(var(--layout-section-spacing) * 0.5);
}

/* ==========================================================================
   4. Header Shell Foundation
   The floating liquid-glass navigation bar is defined in navigation.css.
   ========================================================================== */
.site-header-container {
	position: relative;
	width: 100%;
}

/* ==========================================================================
   5. Footer Shell Foundation
   Museum field journal footer styled in Deep Fern (#1F4A32).
   ========================================================================== */
.site-footer {
	width: 100%;
	background-color: var(--color-bg-dark, #1F4A32);
	color: var(--color-bone, #F6F0E3);
	padding-top: var(--space-4xl);
	padding-bottom: var(--space-3xl);
	margin-top: auto;
}

.site-footer a {
	color: var(--color-bone, #F6F0E3);
	text-decoration: none;
	transition: color var(--motion-duration-fast) var(--motion-ease-standard);
}

.site-footer a:hover,
.site-footer a:focus-visible {
	color: var(--color-moss, #8DA85A);
}

.site-footer__inner {
	display: flex;
	flex-direction: column;
	gap: var(--space-2xl);
}

.site-footer__grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-2xl);
}

@media (min-width: 600px) and (max-width: 991px) {
	.site-footer__grid {
		grid-template-columns: 1fr 1fr;
	}
}

@media (min-width: 992px) {
	.site-footer__grid {
		grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
	}
}

.site-footer__brand-area {
	display: flex;
	flex-direction: column;
	gap: var(--space-md);
}

.site-footer__brand-header {
	display: flex;
	align-items: center;
	gap: 10px;
}

.site-footer__logo-link {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	text-decoration: none;
	color: inherit;
	border-radius: var(--radius-sm);
	transition: opacity var(--transition-fast);
}

.site-footer__logo-link:hover {
	opacity: 0.9;
}

.site-footer__logo-link:focus-visible {
	outline: var(--focus-ring-width) solid var(--color-amber);
	outline-offset: var(--focus-ring-offset);
}

.site-footer__logo-mark {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 32px;
	height: 32px;
	flex-shrink: 0;
}

.site-footer__logo-mark svg {
	width: 100%;
	height: 100%;
	display: block;
}

.site-footer__title {
	font-family: var(--font-family-heading);
	font-size: var(--font-size-h3);
	color: var(--color-bone);
	margin: 0;
}

.site-footer__description {
	font-size: var(--font-size-small);
	color: var(--color-dune);
	max-width: 440px;
	line-height: var(--line-height-body);
	margin: 0;
}

.site-footer__badge {
	margin-top: var(--space-xs);
}

.site-footer__heading {
	font-family: var(--font-family-heading);
	font-size: var(--font-size-h4);
	color: var(--color-bone);
	margin: 0 0 var(--space-md);
}

.site-footer__list {
	list-style: none;
	padding: 0;
	margin: 0;
	display: flex;
	flex-direction: column;
	gap: var(--space-xs);
	font-size: var(--font-size-small);
	color: var(--color-dune);
}

.site-footer__link {
	display: inline-block;
	min-height: 36px;
	line-height: 36px;
}

@media (max-width: 768px) {
	.site-footer__link {
		min-height: 44px;
		line-height: 44px;
		display: inline-flex;
		align-items: center;
	}
}

.site-footer__bottom {
	border-top: 1px solid rgba(234, 223, 200, 0.15);
	padding-top: var(--space-xl);
	display: flex;
	flex-direction: column;
	gap: var(--space-md);
	font-size: var(--font-size-small);
	color: var(--color-dune);
}

@media (min-width: 640px) {
	.site-footer__bottom {
		flex-direction: row;
		justify-content: space-between;
		align-items: center;
	}
}

.site-footer__copyright {
	margin: 0;
}

.site-footer__tagline {
	margin: 0;
	font-family: var(--font-family-data);
	font-size: var(--font-size-quick-fact);
	letter-spacing: var(--letter-spacing-wide);
	text-transform: uppercase;
}

/* ==========================================================================
   6. 404 Shell Foundation
   ========================================================================== */
.error-404-wrapper {
	text-align: center;
	padding-top: var(--space-5xl);
	padding-bottom: var(--space-5xl);
}

.error-404-code {
	font-family: var(--font-family-data);
	font-size: clamp(3rem, 2rem + 4vw, 5rem);
	font-weight: var(--font-weight-medium);
	color: var(--color-clay);
	line-height: var(--line-height-display);
	margin-bottom: var(--space-sm);
}

.error-404-title {
	font-size: var(--font-size-h2);
	margin-bottom: var(--space-md);
}

.error-404-message {
	font-size: var(--font-size-body);
	color: var(--color-text-secondary);
	max-width: 520px;
	margin-left: auto;
	margin-right: auto;
	margin-bottom: var(--space-2xl);
}

.error-404-action {
	display: inline-block;
	min-height: var(--btn-height-min);
	padding: var(--btn-padding-y) var(--btn-padding-x);
	border-radius: var(--btn-radius);
	background-color: var(--btn-primary-bg);
	color: var(--btn-primary-text);
	font-family: var(--btn-font-family);
	font-size: var(--btn-font-size);
	font-weight: var(--btn-font-weight);
	line-height: var(--btn-line-height);
	text-decoration: none;
	box-shadow: var(--shadow-sm);
	transition: background-color var(--motion-duration-fast) var(--motion-ease-standard),
	            box-shadow var(--motion-duration-fast) var(--motion-ease-standard);
}

.error-404-action:hover {
	background-color: var(--btn-primary-hover-bg);
	color: var(--btn-primary-hover-text);
	box-shadow: var(--shadow-md);
}