/* ==========================================================================
   Header — site branding, navigazione primaria, mobile menu.
   ========================================================================== */

.site-header {
	position: sticky;
	top: 0;
	z-index: 100;
	background: rgba(255, 255, 255, .92);
	backdrop-filter: saturate(180%) blur(12px);
	-webkit-backdrop-filter: saturate(180%) blur(12px);
	border-bottom: 1px solid var(--color-border);
	transition: box-shadow var(--dur-base) var(--ease);
}
.site-header.is-scrolled {
	box-shadow: var(--shadow-md);
}

.site-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-5);
	min-height: var(--header-height);
}

/* Branding */
.site-branding {
	display: flex;
	align-items: center;
	gap: var(--space-3);
	flex-shrink: 0;
}
.site-branding__logo img {
	max-height: 48px;
	width: auto;
}
.site-branding__title {
	font-family: var(--font-serif);
	font-size: var(--font-size-xl);
	font-weight: 700;
	color: var(--color-primary);
	margin: 0;
	line-height: 1;
}
.site-branding__title a {
	color: inherit;
	text-decoration: none;
}
.site-branding__tagline {
	font-size: var(--font-size-xs);
	color: var(--color-text-muted);
	margin-top: 2px;
}

/* Navigation */
.main-nav {
	display: flex;
	align-items: center;
}

.main-nav__list {
	list-style: none;
	display: flex;
	gap: var(--space-2);
	margin: 0;
	padding: 0;
}
.main-nav__list li { margin: 0; }

.main-nav__list a {
	display: inline-block;
	padding: 10px 16px;
	color: var(--color-text);
	font-weight: 500;
	font-size: var(--font-size-base);
	border-radius: var(--radius-md);
	transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
	text-decoration: none;
}
.main-nav__list a:hover,
.main-nav__list .current-menu-item > a,
.main-nav__list .current_page_item > a {
	background: var(--color-primary-soft);
	color: var(--color-primary);
}

/* Submenu */
.main-nav__list .sub-menu {
	display: none;
	position: absolute;
	top: 100%;
	left: 0;
	min-width: 220px;
	background: var(--color-bg);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	box-shadow: var(--shadow-lg);
	padding: var(--space-2);
	list-style: none;
	margin: var(--space-2) 0 0;
}
.main-nav__list li { position: relative; }
.main-nav__list li:hover > .sub-menu,
.main-nav__list li:focus-within > .sub-menu {
	display: block;
}
.main-nav__list .sub-menu a {
	display: block;
	width: 100%;
}

/* Mobile toggle */
.nav-toggle {
	display: none;
	background: transparent;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	padding: 8px;
	cursor: pointer;
	color: var(--color-text);
}
.nav-toggle:focus-visible { outline: 2px solid var(--color-accent); }
.nav-toggle__icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon-open { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon-close { display: inline-block; }

/* Language switcher */
.lang-switcher {
	list-style: none;
	display: flex;
	gap: var(--space-1);
	padding: 0;
	margin: 0 0 0 var(--space-2);
	align-items: center;
	border-left: 1px solid var(--color-border);
	padding-left: var(--space-3);
}
.lang-switcher__item { margin: 0; }
.lang-switcher__item a {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	padding: 6px 10px;
	font-size: var(--font-size-sm);
	font-weight: 600;
	color: var(--color-text-muted);
	border-radius: var(--radius-md);
	text-decoration: none;
	line-height: 1;
	transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.lang-switcher__item a:hover,
.lang-switcher__item a:focus-visible {
	background: var(--color-bg-alt);
	color: var(--color-text);
}
.lang-switcher__item.is-active a {
	color: var(--color-primary);
	background: var(--color-primary-soft);
}
.lang-switcher__flag {
	display: block;
	border-radius: 2px;
	width: 20px;
	height: 14px;
	object-fit: cover;
	box-shadow: 0 0 0 1px rgba(0, 0, 0, .08);
}
.lang-switcher__code { letter-spacing: 0.04em; }

/* Header CTA */
.header-cta {
	margin-left: var(--space-3);
}

@media (max-width: 1024px) {
	.nav-toggle { display: inline-flex; }

	.main-nav {
		position: fixed;
		top: var(--header-height);
		left: 0;
		right: 0;
		bottom: 0;
		background: var(--color-bg);
		padding: var(--space-5);
		flex-direction: column;
		align-items: stretch;
		gap: var(--space-4);
		transform: translateX(100%);
		transition: transform var(--dur-base) var(--ease);
		overflow-y: auto;
		visibility: hidden;
	}
	.main-nav.is-open {
		transform: translateX(0);
		visibility: visible;
	}

	.main-nav__list {
		flex-direction: column;
		gap: 0;
		width: 100%;
	}
	.main-nav__list a {
		padding: var(--space-4) var(--space-3);
		border-bottom: 1px solid var(--color-border);
		border-radius: 0;
		font-size: var(--font-size-md);
	}
	.main-nav__list .sub-menu {
		position: static;
		display: block;
		box-shadow: none;
		border: 0;
		padding-left: var(--space-4);
		margin: 0;
	}
	.header-cta {
		margin-left: 0;
		margin-top: var(--space-3);
		text-align: center;
	}
	.header-cta .btn { width: 100%; }

	.lang-switcher {
		margin: var(--space-3) 0 0;
		padding: var(--space-3) 0 0;
		border-left: 0;
		border-top: 1px solid var(--color-border);
		justify-content: center;
		gap: var(--space-2);
	}
	.lang-switcher__item a {
		padding: 10px 16px;
		font-size: var(--font-size-base);
	}
}