/* =========================================================================
   ARUNA — Mobile navigation (hamburger toggle + full-screen overlay)
   Task 3.5. All colours reference design tokens. No hardcoded hex.
   Breakpoint: max-width 768px. Reuses the existing .site-header__nav as the
   overlay so header.php only needs the toggle button.
   ========================================================================= */

/* -------------------------------------------------------------------------
   Hamburger toggle button (hidden on desktop)
   ------------------------------------------------------------------------- */
.site-header__toggle {
	display: none;
	align-items: center;
	justify-content: center;
	width: 44px;             /* minimum 44x44 touch target */
	height: 44px;
	padding: 0;
	margin: 0;
	background: transparent;
	border: 0;
	cursor: pointer;
	position: relative;
	z-index: 110;            /* above header content (100) and overlay (90) */
	-webkit-tap-highlight-color: transparent;
}

.site-header__toggle-box {
	position: relative;
	display: block;
	width: 26px;
	height: 18px;
}

.site-header__toggle-line {
	position: absolute;
	left: 0;
	width: 100%;
	height: 2px;
	background-color: var(--color-accent);
	border-radius: var(--radius-sm, 2px);
	transition: transform 0.3s ease, opacity 0.2s ease, top 0.3s ease;
}

.site-header__toggle-line:nth-child(1) { top: 0; }
.site-header__toggle-line:nth-child(2) { top: 8px; }
.site-header__toggle-line:nth-child(3) { top: 16px; }

/* Animate the three lines into an X when the menu is open. */
.is-menu-open .site-header__toggle-line:nth-child(1) {
	top: 8px;
	transform: rotate(45deg);
}

.is-menu-open .site-header__toggle-line:nth-child(2) {
	opacity: 0;
}

.is-menu-open .site-header__toggle-line:nth-child(3) {
	top: 8px;
	transform: rotate(-45deg);
}

/* -------------------------------------------------------------------------
   Scroll lock — class-based, applied to <html> (NOT <body>) to avoid iOS
   position jumps.
   ------------------------------------------------------------------------- */
.is-menu-open {
	overflow: hidden;
	overscroll-behavior: contain;
}

/* -------------------------------------------------------------------------
   Mobile layout + overlay
   ------------------------------------------------------------------------- */
@media (max-width: 768px) {

	/* Show the hamburger. */
	.site-header__toggle {
		display: inline-flex;
	}

	/* Keep the language switcher in the header, grouped to the right next to
	   the toggle (the desktop nav is now a fixed overlay, out of flow). */
	.site-header__lang {
		margin-left: auto;
		margin-right: var(--space-xs);
	}

	/* Turn the primary nav into a full-screen overlay.
	   `display: flex` overrides header.css's display:none (same specificity,
	   loaded later via the aruna-header dependency). */
	.site-header__nav {
		display: flex;
		position: fixed;
		inset: 0;
		z-index: 90;
		flex-direction: column;
		align-items: center;
		justify-content: center;
		background-color: var(--color-primary);
		opacity: 0;
		visibility: hidden;
		pointer-events: none;
		transform: translateY(-12px);
		transition: opacity 0.35s ease, transform 0.35s ease, visibility 0s linear 0.35s;
		overflow-x: hidden;       /* no horizontal scroll */
		overflow-y: auto;
		overscroll-behavior: contain;
	}

	.is-menu-open .site-header__nav {
		opacity: 1;
		visibility: visible;
		pointer-events: auto;
		transform: translateY(0);
		transition: opacity 0.35s ease, transform 0.35s ease;
	}

	/* Stack the links and centre them vertically. */
	.site-header__nav .site-header__menu {
		flex-direction: column;
		align-items: center;
		gap: var(--space-md, 2rem);
		width: 100%;
		padding: var(--space-lg, 4rem) var(--space-md, 2rem);
	}

	/* Large Cormorant Garamond overlay links.
	   The extra-specific selectors keep the links cream on the navy overlay,
	   overriding header.css's inner-page "scrolled" dark-text rule. */
	body .site-header .site-header__nav .site-header__menu a,
	body:not(.home) .site-header.scrolled .site-header__nav .site-header__menu a {
		font-family: var(--font-heading);
		font-size: clamp(2rem, 9vw, 3.25rem);
		font-weight: 400;
		line-height: 1.1;
		letter-spacing: 0.01em;
		color: var(--color-text-inverse);
		padding-block: 0.25rem;
	}

	/* Remove the desktop underline indicator inside the overlay. */
	.site-header__nav .site-header__menu a::after {
		display: none;
	}

	body .site-header .site-header__nav .site-header__menu a:hover,
	body .site-header .site-header__nav .site-header__menu a:focus-visible,
	body .site-header .site-header__nav .site-header__menu .current-menu-item > a,
	body:not(.home) .site-header.scrolled .site-header__nav .site-header__menu a:hover,
	body:not(.home) .site-header.scrolled .site-header__nav .site-header__menu .current-menu-item > a {
		color: var(--color-accent);
	}
}