/* =========================================================================
   ARUNA — Site header component
   All colours reference design tokens from tokens.css. No hardcoded hex.
   ========================================================================= */

:root {
	/* Header-specific layout token (height drives the body offset below). */
	--header-height: 88px;
}

/* -------------------------------------------------------------------------
   Body offset
   Fixed header is lifted out of flow, so push content down by its height.
   The homepage hero sits *under* the transparent header → no offset there.
   ------------------------------------------------------------------------- */
body {
	padding-top: var(--header-height);
}

body.home {
	padding-top: 0;
}

/* -------------------------------------------------------------------------
   Header shell
   ------------------------------------------------------------------------- */
.site-header {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	z-index: 100;
	background-color: var(--color-primary);
	transition: background-color 0.4s ease, box-shadow 0.4s ease;
}

.site-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-md, 2rem);
	min-height: var(--header-height);
	max-width: 1320px;
	margin: 0 auto;
	padding-inline: var(--space-md, 2rem);
}

/* Homepage: transparent on load, navy once scrolled past the threshold. */
body.home .site-header {
	background-color: transparent;
}

body.home .site-header.scrolled {
	background-color: var(--color-primary);
	box-shadow: 0 2px 18px rgba(0, 0, 0, 0.18);
}

/* Inner pages: navy always — only a subtle shadow cue on scroll. */
body:not(.home) .site-header.scrolled {
	box-shadow: 0 2px 18px rgba(0, 0, 0, 0.08);
}

/* -------------------------------------------------------------------------
   Branding / logo
   Two stacked logos — only one is visible depending on header background.
   ------------------------------------------------------------------------- */
.site-header__branding {
	flex: 0 0 auto;
}

.site-header__logo-link {
	display: inline-flex;
	align-items: center;
	line-height: 0;
}

.site-header__logo {
	display: block;
	height: clamp(40px, 4vw, 80px);
	width: auto;
}

/* -------------------------------------------------------------------------
   Primary navigation
   ------------------------------------------------------------------------- */
.site-header__nav {
	flex: 1 1 auto;
	display: flex;
	justify-content: center;
}

.site-header__menu {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	align-items: center;
	gap: var(--space-md, 2rem);
}

.site-header__menu li {
	position: relative;
}

.site-header__menu a {
	position: relative;
	display: inline-block;
	font-family: var(--font-body);
	font-size: 1rem;
	font-weight: 400;
	letter-spacing: 0.01em;
	text-decoration: none;
	color: var(--color-text-inverse);
	padding-block: 0.5rem;
	transition: color 0.25s ease;
}

/* Animated underline indicator. */
.site-header__menu a::after {
	content: "";
	position: absolute;
	left: 0;
	bottom: 0;
	width: 0;
	height: 2px;
	background-color: var(--color-accent);
	transition: width 0.25s ease;
}

.site-header__menu a:hover,
.site-header__menu a:focus-visible {
	color: var(--color-accent);
}

.site-header__menu a:hover::after,
.site-header__menu a:focus-visible::after,
.site-header__menu .current-menu-item > a::after,
.site-header__menu .current-menu-ancestor > a::after {
	width: 100%;
}

.site-header__menu .current-menu-item > a,
.site-header__menu .current-menu-ancestor > a {
	color: var(--color-accent);
}

/* -------------------------------------------------------------------------
   Language switcher
   ------------------------------------------------------------------------- */
.site-header__lang {
	flex: 0 0 auto;
}

.site-header__lang-list {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	align-items: center;
	gap: var(--space-xs);
}

.site-header__lang-list a {
	display: inline-flex;
	align-items: center;
	gap: 0.4rem;
	font-family: var(--font-body);
	font-size: 0.8rem;
	font-weight: 600;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	text-decoration: none;
	color: var(--color-text-inverse);
	opacity: 0.65;
	transition: opacity 0.25s ease, color 0.25s ease;
}

.site-header__lang-list a:hover,
.site-header__lang-list a:focus-visible {
	color: var(--color-accent);
	opacity: 1;
}

.site-header__lang-list .current-lang > a,
.site-header__lang-list li.current-lang > a {
	color: var(--color-accent);
	opacity: 1;
}

.site-header__lang-list img {
	display: block;
	width: 18px;
	height: auto;
}

/* -------------------------------------------------------------------------
   Responsive
   Desktop nav is hidden on small screens; the mobile hamburger menu is
   delivered separately in Task 3.5.
   ------------------------------------------------------------------------- */
@media (max-width: 900px) {
	:root {
		--header-height: 72px;
	}

	.site-header__logo {
		height: 40px;
	}

	.site-header__nav {
		display: none;
	}
}