/**
 * Age of Dinosaurs — Global Navigation & Liquid-Glass Floating Header
 *
 * Three-state liquid-glass navigation system:
 * - State A (top of page): very transparent, blends into the hero.
 * - State B (scrolled): stronger glass surface, blur, border, shadow.
 * - State C (mobile menu open): strongest surface behind the sheet.
 *
 * Reusable glass treatment (.aod-glass) shared by the header pill and the
 * mobile navigation sheet, with a solid fallback when backdrop-filter is
 * unavailable.
 *
 * @package AgeOfDinosaurs
 */

/* ==========================================================================
   0. Reusable Liquid-Glass Surface
   Translucent warm surface, backdrop blur + saturation, subtle Dune border,
   inner top highlight, and soft warm shadow.
   ========================================================================== */
.aod-glass {
	background-color: var(--nav-glass-bg);
	backdrop-filter: blur(var(--nav-glass-blur)) saturate(var(--nav-glass-saturate));
	-webkit-backdrop-filter: blur(var(--nav-glass-blur)) saturate(var(--nav-glass-saturate));
	border: 1px solid var(--nav-glass-border);
	box-shadow:
		var(--nav-glass-shadow),
		var(--nav-glass-highlight);
}

/* Graceful fallback: no backdrop-filter support → near-solid warm surface */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
	.aod-glass {
		background-color: rgba(255, 250, 240, 0.98);
	}
}

/* ==========================================================================
   1. Floating Header Shell
   Fixed floating rounded rectangle positioned ~14px from top, max-width 1140px.
   ========================================================================== */
.site-header-wrapper {
	position: fixed;
	top: var(--nav-top-offset, 14px);
	left: 0;
	right: 0;
	z-index: var(--z-header, 1200);
	display: flex;
	justify-content: center;
	padding: 0 var(--space-md);
	pointer-events: none; /* Allows clicks on page elements around the pill */
}

.site-header {
	pointer-events: auto; /* Re-enable pointer events for the header */
	width: 100%;
	max-width: var(--nav-max-width, 1140px);
	border-radius: var(--nav-radius, 16px);
	padding: 8px 20px;
	transition:
		padding var(--motion-duration-normal) var(--motion-ease-standard),
		background-color var(--motion-duration-normal) var(--motion-ease-standard),
		box-shadow var(--motion-duration-normal) var(--motion-ease-standard),
		border-color var(--motion-duration-normal) var(--motion-ease-standard);
}

/* State B: scrolling — slightly stronger glass, tighter padding */
.site-header--scrolled {
	padding: 6px 18px;
	background-color: var(--nav-glass-bg-scrolled);
	backdrop-filter: blur(var(--nav-glass-blur-scrolled)) saturate(var(--nav-glass-saturate));
	-webkit-backdrop-filter: blur(var(--nav-glass-blur-scrolled)) saturate(var(--nav-glass-saturate));
	border-color: var(--nav-glass-border-scrolled);
	box-shadow:
		var(--nav-glass-shadow-scrolled),
		var(--nav-glass-highlight);
}

/* State C: mobile menu open — strongest surface for sheet readability */
.site-header--menu-open {
	background-color: var(--nav-glass-bg-open);
	border-color: var(--nav-glass-border-scrolled);
	box-shadow:
		var(--nav-glass-shadow-scrolled),
		var(--nav-glass-highlight);
}

.site-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-md);
	min-height: 48px;
}

/* ==========================================================================
   2. Brand Area (Left Zone)
   ========================================================================== */
.site-header__brand {
	display: flex;
	align-items: center;
	flex-shrink: 0;
}

.site-header__logo-link {
	display: flex;
	align-items: center;
	gap: 10px;
	text-decoration: none;
	color: var(--color-espresso);
	border-radius: var(--radius-pill);
	padding: 4px 6px;
	min-height: 44px;
	box-sizing: border-box;
	transition: opacity var(--motion-duration-fast) var(--motion-ease-standard);
}

.site-header__logo-link:hover {
	opacity: 0.88;
}

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

.site-header__logo-mark {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 32px;
	height: 32px;
	flex-shrink: 0;
	border-radius: var(--radius-pill);
	box-shadow: var(--shadow-sm);
}

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

.site-header__brand-text {
	font-family: var(--font-family-heading);
	font-size: clamp(1.125rem, 1rem + 0.3vw, 1.25rem);
	font-weight: var(--font-weight-bold);
	color: var(--color-espresso);
	letter-spacing: var(--letter-spacing-tight);
	line-height: 1;
	white-space: nowrap;
}

/* ==========================================================================
   3. Desktop Navigation (Center Zone)
   ========================================================================== */
.site-nav {
	display: none; /* Hidden on mobile/tablet; shown at 992px+ */
}

@media (min-width: 992px) {
	.site-nav {
		display: block;
	}
}

.site-nav__list {
	display: flex;
	align-items: center;
	gap: 6px;
	list-style: none;
	margin: 0;
	padding: 0;
}

.site-nav__item {
	margin: 0;
	padding: 0;
}

.site-nav__link {
	position: relative;
	display: inline-flex;
	align-items: center;
	padding: 8px 14px;
	border-radius: 10px;
	font-family: var(--font-family-body);
	font-size: var(--font-size-small);
	font-weight: 600;
	color: var(--color-espresso);
	text-decoration: none;
	line-height: var(--line-height-ui);
	transition: 
		color var(--motion-duration-fast) var(--motion-ease-standard),
		background-color var(--motion-duration-fast) var(--motion-ease-standard);
	z-index: 1;
}

/* Liquid hover highlight wash (180ms transition) */
.site-nav__link::before {
	content: "";
	position: absolute;
	inset: 0;
	border-radius: 10px;
	background-color: rgba(63, 125, 78, 0.08); /* Fern tint */
	opacity: 0;
	transition: opacity var(--motion-duration-fast) var(--motion-ease-standard);
	z-index: -1;
}

.site-nav__link:hover {
	color: var(--color-deep-fern);
}

.site-nav__link:hover::before {
	opacity: 1;
}

/* Active navigation state: subtle wash + weight + delicate bottom indicator */
.site-nav__link[aria-current="page"],
.site-nav__link.is-active {
	font-weight: var(--font-weight-bold);
	color: var(--color-deep-fern);
}

.site-nav__link[aria-current="page"]::before,
.site-nav__link.is-active::before {
	opacity: 1;
	background-color: rgba(63, 125, 78, 0.12);
}

.site-nav__link[aria-current="page"]::after,
.site-nav__link.is-active::after {
	content: "";
	position: absolute;
	bottom: 4px;
	left: 50%;
	transform: translateX(-50%);
	width: 14px;
	height: 2px;
	border-radius: 1px;
	background-color: var(--color-fern);
}

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

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
	.site-nav__link::before {
		transform: none;
		transition: opacity 0ms linear;
	}
}

/* ==========================================================================
   4. Header Action Controls (Right Zone)
   Search trigger, Subscribe CTA, and Mobile menu toggle.
   ========================================================================== */
.site-header__actions {
	display: flex;
	align-items: center;
	gap: 8px;
	flex-shrink: 0;
}

/* Search trigger button */
.nav-action-btn--search {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 6px;
	min-height: 40px;
	min-width: 40px;
	padding: 6px 12px;
	background: transparent;
	border: 1px solid transparent;
	border-radius: 10px;
	color: var(--color-espresso);
	font-family: var(--font-family-body);
	font-size: var(--font-size-small);
	font-weight: var(--font-weight-semibold);
	cursor: pointer;
	transition:
		background-color var(--motion-duration-fast) var(--motion-ease-standard),
		border-color var(--motion-duration-fast) var(--motion-ease-standard),
		color var(--motion-duration-fast) var(--motion-ease-standard);
}

.nav-action-btn--search:hover {
	background-color: rgba(46, 42, 34, 0.06);
	color: var(--color-fern);
}

/* Active search state (when viewing search results page) */
body.search .nav-action-btn--search,
.nav-action-btn--search.is-active,
.nav-action-btn--search[aria-current="page"] {
	background-color: rgba(63, 125, 78, 0.1);
	border-color: rgba(63, 125, 78, 0.32);
	color: var(--color-deep-fern);
	font-weight: var(--font-weight-bold);
}

.nav-action-btn--search:focus-visible {
	outline: var(--focus-ring-width) solid var(--focus-ring-color);
	outline-offset: var(--focus-ring-offset);
}

.nav-action-btn__icon {
	width: 18px;
	height: 18px;
	flex-shrink: 0;
}

.nav-action-btn__label {
	display: none;
}

@media (min-width: 480px) {
	.nav-action-btn__label {
		display: inline;
	}
}

/* Subscribe button in header */
.site-header .btn--subscribe {
	min-height: 40px;
	padding: 8px 18px;
	font-size: var(--font-size-small);
	border-radius: 10px;
	white-space: nowrap;
}

@media (max-width: 540px) {
	.site-header .btn--subscribe {
		display: none; /* Placed prominently in the mobile sheet */
	}
}

/* ==========================================================================
   5. Mobile Menu Toggle Button (Hamburger)
   Visible only on screens < 992px. Morphs into a close icon on open.
   ========================================================================== */
.mobile-nav-toggle {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 44px;
	height: 44px;
	padding: 0;
	background: transparent;
	border: none;
	border-radius: 10px;
	cursor: pointer;
	color: var(--color-espresso);
	transition: background-color var(--motion-duration-fast) var(--motion-ease-standard);
}

@media (min-width: 992px) {
	.mobile-nav-toggle {
		display: none;
	}
}

.mobile-nav-toggle:hover {
	background-color: rgba(46, 42, 34, 0.06);
}

.mobile-nav-toggle:focus-visible {
	outline: var(--focus-ring-width) solid var(--focus-ring-color);
	outline-offset: var(--focus-ring-offset);
}

.mobile-nav-toggle__box {
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	gap: 5px;
	width: 20px;
	height: 16px;
}

.mobile-nav-toggle__bar {
	display: block;
	width: 20px;
	height: 2px;
	background-color: var(--color-espresso);
	border-radius: 1px;
	transition:
		transform var(--motion-duration-normal) var(--motion-ease-emphasized),
		opacity var(--motion-duration-fast) var(--motion-ease-standard);
}

/* Morph to 'X' when active */
.mobile-nav-toggle.is-active .mobile-nav-toggle__bar:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}

.mobile-nav-toggle.is-active .mobile-nav-toggle__bar:nth-child(2) {
	opacity: 0;
}

.mobile-nav-toggle.is-active .mobile-nav-toggle__bar:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   6. Mobile Navigation Sheet / Panel
   Full-width frosted liquid-glass panel extending the navigation.
   Choreography:
   1. navbar glass strengthens (.site-header--menu-open)
   2. backdrop overlay fades in
   3. menu panel appears
   4. menu items stagger upward/fade in
   5. CTA actions become visible
   ========================================================================== */
.mobile-nav-panel {
	position: fixed;
	inset: 0;
	z-index: var(--z-mobile-nav, 1100);
	display: flex;
	flex-direction: column;
	pointer-events: none;
	opacity: 0;
	visibility: hidden;
	transition:
		opacity var(--motion-duration-normal) var(--motion-ease-standard),
		visibility 0ms linear var(--motion-duration-normal);
}

.mobile-nav-panel.is-open {
	pointer-events: auto;
	opacity: 1;
	visibility: visible;
	transition:
		opacity var(--motion-duration-normal) var(--motion-ease-standard),
		visibility 0ms;
}

.mobile-nav-panel[hidden] {
	display: none;
}

.mobile-nav-panel__backdrop {
	position: absolute;
	inset: 0;
	background-color: rgba(46, 42, 34, 0.45);
	backdrop-filter: blur(8px);
	-webkit-backdrop-filter: blur(8px);
	opacity: 0;
	transition: opacity var(--motion-duration-slow) var(--motion-ease-standard);
}

.mobile-nav-panel.is-open .mobile-nav-panel__backdrop {
	opacity: 1;
}

.mobile-nav-panel__sheet {
	position: relative;
	display: flex;
	flex-direction: column;
	width: calc(100% - 24px);
	max-width: 440px;
	margin: calc(var(--nav-top-offset, 14px) + 54px + 8px) auto 0;
	background-color: var(--nav-glass-bg-open);
	backdrop-filter: blur(var(--nav-glass-blur-scrolled)) saturate(var(--nav-glass-saturate));
	-webkit-backdrop-filter: blur(var(--nav-glass-blur-scrolled)) saturate(var(--nav-glass-saturate));
	border: 1px solid var(--nav-glass-border-scrolled);
	border-radius: 18px;
	box-shadow:
		var(--nav-glass-shadow-scrolled),
		var(--nav-glass-highlight);
	overflow-y: auto;
	max-height: calc(100vh - 100px);
	padding: var(--space-lg) var(--space-xl) var(--space-xl);
	transform: translateY(-14px);
	transition:
		transform var(--motion-duration-slow) var(--motion-ease-emphasized),
		opacity var(--motion-duration-normal) var(--motion-ease-standard);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
	.mobile-nav-panel__sheet {
		background-color: var(--color-chalk);
	}
}

.mobile-nav-panel.is-open .mobile-nav-panel__sheet {
	transform: translateY(0);
}

.mobile-nav__list {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	flex-direction: column;
}

/* Staggered entrance: items rise and fade in sequence on open */
.mobile-nav__list li {
	opacity: 0;
	transform: translateY(12px);
	transition:
		opacity var(--motion-duration-normal) var(--motion-ease-standard),
		transform var(--motion-duration-normal) var(--motion-ease-emphasized);
}

.mobile-nav-panel.is-open .mobile-nav__list li {
	opacity: 1;
	transform: translateY(0);
}

.mobile-nav-panel.is-open .mobile-nav__list li:nth-child(1) { transition-delay: 40ms; }
.mobile-nav-panel.is-open .mobile-nav__list li:nth-child(2) { transition-delay: 80ms; }
.mobile-nav-panel.is-open .mobile-nav__list li:nth-child(3) { transition-delay: 120ms; }
.mobile-nav-panel.is-open .mobile-nav__list li:nth-child(4) { transition-delay: 160ms; }
.mobile-nav-panel.is-open .mobile-nav__list li:nth-child(5) { transition-delay: 200ms; }

.mobile-nav__link {
	display: flex;
	align-items: center;
	justify-content: space-between;
	min-height: 52px;
	padding: 10px 4px;
	font-family: var(--font-family-body);
	font-size: 1.125rem;
	font-weight: var(--font-weight-semibold);
	color: var(--color-espresso);
	text-decoration: none;
	border-bottom: 1px solid rgba(216, 204, 178, 0.4);
	transition: color var(--motion-duration-fast) var(--motion-ease-standard);
}

.mobile-nav__arrow {
	color: var(--color-stone);
	font-size: 1rem;
	transition:
		color var(--motion-duration-fast) var(--motion-ease-standard),
		transform var(--motion-duration-fast) var(--motion-ease-standard);
}

.mobile-nav__link:hover,
.mobile-nav__link:focus {
	color: var(--color-fern);
}

.mobile-nav__link:hover .mobile-nav__arrow,
.mobile-nav__link:focus .mobile-nav__arrow {
	color: var(--color-fern);
	transform: translateX(3px);
}

.mobile-nav__link[aria-current="page"],
.mobile-nav__link.is-active {
	color: var(--color-fern);
	font-weight: var(--font-weight-bold);
}

.mobile-nav__link[aria-current="page"] .mobile-nav__arrow,
.mobile-nav__link.is-active .mobile-nav__arrow {
	color: var(--color-fern);
}

/* Action CTAs fade in last */
.mobile-nav-panel__actions {
	display: flex;
	flex-direction: column;
	gap: var(--space-md);
	margin-top: var(--space-xl);
	opacity: 0;
	transform: translateY(10px);
	transition:
		opacity var(--motion-duration-slow) var(--motion-ease-standard) 260ms,
		transform var(--motion-duration-slow) var(--motion-ease-emphasized) 260ms;
}

.mobile-nav-panel.is-open .mobile-nav-panel__actions {
	opacity: 1;
	transform: translateY(0);
}

.mobile-nav-panel__actions .btn {
	min-height: 48px;
	font-size: 0.9375rem;
}

/* Reduced motion: no stagger, no large transforms — simple fade only */
@media (prefers-reduced-motion: reduce) {
	.mobile-nav-panel__sheet,
	.mobile-nav-panel__backdrop {
		transition: opacity 0ms linear;
		transform: none;
	}

	.mobile-nav__list li,
	.mobile-nav-panel__actions {
		transition: opacity 0ms linear;
		transition-delay: 0ms;
		transform: none;
	}
}

/* ==========================================================================
   7. Responsive & Viewport Refinements
   ========================================================================== */
@media (max-width: 991px) {
	.site-header-wrapper {
		top: 12px;
		padding: 0 12px;
	}

	.site-header {
		max-width: 100%;
		padding: 8px 14px;
	}
}

@media (max-width: 480px) {
	.site-header-wrapper {
		padding: 0 10px;
		top: 10px;
	}

	.site-header {
		padding: 6px 12px;
	}

	.mobile-nav-panel__sheet {
		width: calc(100% - 20px);
		margin-top: calc(10px + 50px + 8px);
		padding: var(--space-md) var(--space-lg) var(--space-lg);
	}
}

@media (max-width: 360px) {
	.site-header-wrapper {
		padding: 0 6px;
		top: 8px;
	}

	.site-header {
		padding: 4px 8px;
	}

	.site-header__logo-link {
		gap: 6px;
		padding: 2px 4px;
	}

	.site-header__logo-mark {
		width: 28px;
		height: 28px;
	}

	.site-header__brand-text {
		font-size: 0.9375rem;
	}

	.mobile-nav-panel__sheet {
		width: calc(100% - 12px);
		margin-top: calc(8px + 46px + 6px);
		padding: var(--space-sm) var(--space-md) var(--space-md);
	}
}