/* =============================================================================
   TinySpacer — assets/css/header.css
   -----------------------------------------------------------------------------
   Site header component: sticky bar, centered nav, expanding search overlay,
   and the accessible mobile slide-out menu.

   Depends on the tokens defined in assets/css/global.css (load global.css
   first). All values reference --ts-* custom properties; no hard-coded brand
   colors are repeated here.

   Enqueue in functions.php (see note at the bottom of this component's docs):
     wp_enqueue_style(
       'tinyspacer-header',
       get_theme_file_uri( 'assets/css/header.css' ),
       array( 'tinyspacer-global' ),
       filemtime( get_theme_file_path( 'assets/css/header.css' ) )
     );

   Mobile-first: base styles target small screens; the desktop layout is
   layered on at >= 64em (1024px).
   ========================================================================== */

/* -----------------------------------------------------------------------------
   Local component tokens
   -------------------------------------------------------------------------- */
.ts-header {
	--ts-header-height: 72px;
	--ts-header-bg: var(--ts-color-bg);
}

/* -----------------------------------------------------------------------------
   Sticky bar
   -------------------------------------------------------------------------- */
.ts-header {
	position: sticky;
	top: 0;
	z-index: var(--ts-z-header);
	background-color: var(--ts-header-bg);
	border-bottom: 1px solid transparent;
	transition: box-shadow var(--ts-transition-base),
		border-color var(--ts-transition-base),
		background-color var(--ts-transition-base);
}

/* Soft shadow appears only after the page has scrolled (toggled by header.js). */
.ts-header.is-scrolled {
	background-color: color-mix(in srgb, var(--ts-color-bg) 88%, var(--ts-white));
	border-bottom-color: var(--ts-color-border);
	box-shadow: var(--ts-shadow-sm);
}

.ts-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--ts-space-4);
	min-height: var(--ts-header-height);
}

/* -----------------------------------------------------------------------------
   Brand / logo (left)
   -------------------------------------------------------------------------- */
.ts-header__brand {
	display: flex;
	align-items: center;
	flex: 0 0 auto;
}

.ts-site-title {
	margin: 0;
	font-family: var(--ts-font-heading);
	font-size: var(--ts-text-xl);
	font-weight: var(--ts-weight-semibold);
	letter-spacing: var(--ts-tracking-tight);
	line-height: 1;
}

.ts-site-title a {
	color: var(--ts-color-heading);
	text-decoration: none;
}

.ts-site-title a:hover {
	color: var(--ts-color-primary);
}

.ts-header__brand .custom-logo-link {
	display: inline-flex;
}

.ts-header__brand .custom-logo {
	height: auto;
	max-height: 44px;
	width: auto;
}

/* -----------------------------------------------------------------------------
   Header actions (search + hamburger)
   -------------------------------------------------------------------------- */
.ts-header__actions {
	display: flex;
	align-items: center;
	gap: var(--ts-space-1);
	flex: 0 0 auto;
}

.ts-icon-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 44px;
	height: 44px;
	padding: 0;
	color: var(--ts-color-text);
	background: none;
	border: 0;
	border-radius: var(--ts-radius-pill);
	cursor: pointer;
	transition: background-color var(--ts-transition-fast), color var(--ts-transition-fast);
}

.ts-icon-btn:hover {
	color: var(--ts-color-primary);
	background-color: var(--ts-color-surface-alt);
}

.ts-icon {
	display: block;
}

/* Hamburger icon. */
.ts-burger {
	display: inline-flex;
	flex-direction: column;
	justify-content: center;
	gap: 5px;
	width: 22px;
	height: 16px;
}

.ts-burger__bar {
	display: block;
	height: 2px;
	width: 100%;
	background-color: currentColor;
	border-radius: var(--ts-radius-pill);
	transition: transform var(--ts-transition-base), opacity var(--ts-transition-fast);
}

/* Animate burger into an X when the menu is open. */
.ts-header__toggle[aria-expanded="true"] .ts-burger__bar:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}

.ts-header__toggle[aria-expanded="true"] .ts-burger__bar:nth-child(2) {
	opacity: 0;
}

.ts-header__toggle[aria-expanded="true"] .ts-burger__bar:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

/* -----------------------------------------------------------------------------
   Navigation — mobile-first (slide-out drawer)
   -------------------------------------------------------------------------- */
.ts-nav {
	position: fixed;
	top: 0;
	right: 0;
	bottom: 0;
	z-index: var(--ts-z-modal);
	width: min(84vw, 340px);
	padding: calc(var(--ts-header-height) + var(--ts-space-4)) var(--ts-space-6) var(--ts-space-8);
	background-color: var(--ts-color-surface);
	border-left: 1px solid var(--ts-color-border);
	box-shadow: var(--ts-shadow-lg);
	overflow-y: auto;
	transform: translateX(100%);
	visibility: hidden;
	transition: transform var(--ts-transition-base), visibility var(--ts-transition-base);
}

.ts-nav.is-open {
	transform: translateX(0);
	visibility: visible;
}

.ts-menu {
	display: flex;
	flex-direction: column;
	gap: var(--ts-space-1);
	margin: 0;
	padding: 0;
	list-style: none;
}

.ts-menu__link,
.ts-menu a {
	display: block;
	padding: var(--ts-space-3) var(--ts-space-2);
	font-family: var(--ts-font-heading);
	font-size: var(--ts-text-lg);
	font-weight: var(--ts-weight-medium);
	color: var(--ts-color-text);
	text-decoration: none;
	border-radius: var(--ts-radius-md);
	transition: color var(--ts-transition-fast), background-color var(--ts-transition-fast);
}

.ts-menu__link:hover,
.ts-menu a:hover,
.ts-menu .current-menu-item > a {
	color: var(--ts-color-primary);
	background-color: var(--ts-color-surface-alt);
}

/* Slide-out backdrop. */
.ts-nav-overlay {
	position: fixed;
	inset: 0;
	z-index: var(--ts-z-overlay);
	background-color: color-mix(in srgb, var(--ts-ink) 42%, transparent);
	opacity: 0;
	transition: opacity var(--ts-transition-base);
}

.ts-nav-overlay.is-visible {
	opacity: 1;
}

/* Lock body scroll while the drawer or search is open (class set by JS). */
.ts-scroll-locked {
	overflow: hidden;
}

/* -----------------------------------------------------------------------------
   Expanding search overlay
   -------------------------------------------------------------------------- */
.ts-search {
	position: absolute;
	top: 100%;
	left: 0;
	right: 0;
	background-color: var(--ts-color-surface);
	border-bottom: 1px solid var(--ts-color-border);
	box-shadow: var(--ts-shadow-md);
	/* Collapsed by default; expands via grid-rows for a smooth <=200ms reveal. */
	display: grid;
	grid-template-rows: 0fr;
	opacity: 0;
	visibility: hidden;
	transition: grid-template-rows var(--ts-transition-base),
		opacity var(--ts-transition-base),
		visibility var(--ts-transition-base);
}

.ts-search.is-open {
	grid-template-rows: 1fr;
	opacity: 1;
	visibility: visible;
}

.ts-search__inner {
	min-height: 0; /* Required so the collapsing grid row can reach 0. */
	overflow: hidden;
}

.ts-search__form {
	display: flex;
	align-items: center;
	gap: var(--ts-space-3);
	padding-block: var(--ts-space-5);
}

.ts-search__input {
	flex: 1 1 auto;
}

.ts-search__submit {
	flex: 0 0 auto;
}

.ts-search__close {
	flex: 0 0 auto;
}

/* -----------------------------------------------------------------------------
   Desktop layout (>= 1024px)
   -------------------------------------------------------------------------- */
@media (min-width: 64em) {

	/* Hamburger is mobile-only. */
	.ts-header__toggle {
		display: none;
	}

	/* Centered navigation: brand left, nav center, actions right. */
	.ts-header__inner {
		gap: var(--ts-space-8);
	}

	.ts-nav {
		position: static;
		width: auto;
		flex: 1 1 auto;
		padding: 0;
		background: none;
		border: 0;
		box-shadow: none;
		overflow: visible;
		transform: none;
		visibility: visible;
		display: flex;
		justify-content: center;
	}

	.ts-menu {
		flex-direction: row;
		align-items: center;
		gap: var(--ts-space-2);
	}

	.ts-menu__link,
	.ts-menu a {
		padding: var(--ts-space-2) var(--ts-space-3);
		font-size: var(--ts-text-base);
		white-space: nowrap;
	}

	/* Subtle underline affordance on hover/active for desktop. */
	.ts-menu__link {
		position: relative;
	}

	.ts-menu__link::after {
		content: "";
		position: absolute;
		left: var(--ts-space-3);
		right: var(--ts-space-3);
		bottom: 4px;
		height: 2px;
		background-color: var(--ts-color-primary);
		border-radius: var(--ts-radius-pill);
		transform: scaleX(0);
		transform-origin: left center;
		transition: transform var(--ts-transition-base);
	}

	.ts-menu__link:hover::after,
	.ts-menu .current-menu-item > .ts-menu__link::after {
		transform: scaleX(1);
	}

	.ts-menu__link:hover,
	.ts-menu .current-menu-item > a {
		background: none;
	}

	/* Overlay never needed on desktop. */
	.ts-nav-overlay {
		display: none;
	}
}

/* -----------------------------------------------------------------------------
   Reduced motion: neutralize component transitions
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
	.ts-header,
	.ts-nav,
	.ts-search,
	.ts-nav-overlay,
	.ts-burger__bar,
	.ts-menu__link::after {
		transition-duration: 0.001ms !important;
	}
}