/* Site header — Prolens-style sticky nav */

.site-header {
	position: sticky;
	top: 0;
	z-index: 1000;
	width: 100%;
	background-color: rgba(255, 255, 255, 0.85);
	backdrop-filter: blur(12px);
	-webkit-backdrop-filter: blur(12px);
	border-bottom: 1px solid transparent;
	transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-header.header--scrolled {
	border-bottom-color: rgba(17, 17, 17, 0.08);
	background-color: rgba(255, 255, 255, 0.95);
}

.site-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-md);
	min-height: 4.5rem;
	padding-block: var(--space-md);
}

.site-header__logo {
	flex-shrink: 0;
	font-size: var(--fs-body);
	font-weight: var(--fw-bold);
	letter-spacing: -0.02em;
	color: var(--color-text-dark);
	line-height: 1.2;
}

.site-header__logo:hover,
.site-header__logo:focus-visible {
	opacity: 0.7;
}

.site-header__nav {
	display: none;
}

.site-header__nav-list {
	display: flex;
	align-items: center;
	gap: clamp(var(--space-md), 2vw, var(--space-xl));
}

.site-header__nav-link {
	display: inline-flex;
	align-items: center;
	gap: 0.35rem;
	font-size: var(--fs-small);
	font-weight: var(--fw-medium);
	color: var(--color-text-dark);
	transition: opacity var(--transition-fast);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
	opacity: 0.55;
}

.site-header__nav-chevron {
	display: inline-flex;
	opacity: 0.45;
	transform: translateY(1px);
}

.site-header__actions {
	display: flex;
	align-items: center;
	gap: var(--space-md);
	margin-left: auto;
}

.site-header__lang-toggle {
	display: none;
	align-items: center;
	gap: 0.25rem;
	font-size: var(--fs-small);
	font-weight: var(--fw-medium);
}

.site-header__lang-btn {
	padding: 0.15rem 0.2rem;
	color: var(--color-text-muted);
	transition: color var(--transition-fast);
}

.site-header__lang-btn:hover,
.site-header__lang-btn:focus-visible,
.site-header__lang-btn.is-active,
.site-header__lang-btn[aria-pressed='true'] {
	color: var(--color-text-dark);
}

.site-header__lang-sep {
	color: var(--color-text-muted);
	user-select: none;
}

.site-header__cta {
	display: none;
	align-items: center;
	gap: 0.65rem;
	padding: 0.55rem 0.55rem 0.55rem 1.15rem;
	background-color: var(--color-bg-dark);
	color: var(--color-text-light);
	font-size: var(--fs-small);
	font-weight: var(--fw-medium);
	border-radius: var(--radius-full);
	line-height: 1.2;
	white-space: nowrap;
	transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.site-header__cta:hover,
.site-header__cta:focus-visible {
	opacity: 0.88;
}

.site-header__cta-icon {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 1.75rem;
	height: 1.75rem;
	border-radius: var(--radius-full);
	background-color: var(--color-bg-light);
	color: var(--color-text-dark);
	flex-shrink: 0;
}

.site-header__burger {
	display: inline-flex;
	flex-direction: column;
	justify-content: center;
	gap: 5px;
	width: 2.5rem;
	height: 2.5rem;
	padding: 0.5rem;
	border-radius: var(--radius-sm);
	position: relative;
	z-index: 1001;
}

.site-header__burger-line {
	display: block;
	width: 100%;
	height: 2px;
	background-color: var(--color-text-dark);
	border-radius: 1px;
	transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__burger[aria-expanded='true'] .site-header__burger-line:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}

.site-header__burger[aria-expanded='true'] .site-header__burger-line:nth-child(2) {
	opacity: 0;
}

.site-header__burger[aria-expanded='true'] .site-header__burger-line:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

/* Panel-only CTA: shown inside the mobile menu, never in the desktop bar. */
.site-header__nav-footer {
	display: none;
}

/* Mobile / tablet: full-screen panel when .is-open */
@media (max-width: 767px) {
	/*
	 * backdrop-filter makes the header the containing block for its fixed
	 * descendants, which would clip the panel below to the header's own box.
	 */
	.site-header {
		background-color: var(--color-bg-light);
		backdrop-filter: none;
		-webkit-backdrop-filter: none;
	}

	/* Bar stays legible and clickable on top of the panel it opens. */
	.site-header__logo,
	.site-header__actions {
		position: relative;
		z-index: 1001;
	}

	.site-header__nav {
		display: flex;
		flex-direction: column;
		justify-content: space-between;
		gap: var(--space-2xl);
		position: fixed;
		inset: 0;
		z-index: 999;
		padding: calc(4.5rem + var(--space-xl)) var(--space-xl)
			calc(var(--space-xl) + env(safe-area-inset-bottom, 0px));
		background-color: var(--color-bg-light);
		background-image: radial-gradient(rgba(17, 17, 17, 0.07) 1px, transparent 1px);
		background-size: 18px 18px;
		overflow-y: auto;
		overscroll-behavior: contain;
		visibility: hidden;
		opacity: 0;
		transition:
			opacity var(--transition-medium),
			visibility var(--transition-medium);
	}

	.site-header__nav.is-open {
		visibility: visible;
		opacity: 1;
	}

	.site-header__nav-list {
		flex-direction: column;
		align-items: stretch;
		gap: 0;
		counter-reset: ri-nav;
	}

	.site-header__nav-item {
		counter-increment: ri-nav;
		border-bottom: 1px solid rgba(17, 17, 17, 0.08);
		opacity: 0;
		transform: translateY(14px);
		transition:
			opacity 0.45s var(--ease-default),
			transform 0.45s var(--ease-default);
	}

	.site-header__nav-item:first-child {
		border-top: 1px solid rgba(17, 17, 17, 0.08);
	}

	.site-header__nav.is-open .site-header__nav-item {
		opacity: 1;
		transform: none;
	}

	.site-header__nav.is-open .site-header__nav-item:nth-child(1) {
		transition-delay: 0.06s;
	}

	.site-header__nav.is-open .site-header__nav-item:nth-child(2) {
		transition-delay: 0.12s;
	}

	.site-header__nav.is-open .site-header__nav-item:nth-child(3) {
		transition-delay: 0.18s;
	}

	.site-header__nav.is-open .site-header__nav-item:nth-child(4) {
		transition-delay: 0.24s;
	}

	.site-header__nav.is-open .site-header__nav-item:nth-child(5) {
		transition-delay: 0.3s;
	}

	.site-header__nav-link {
		justify-content: flex-start;
		gap: var(--space-md);
		padding-block: var(--space-lg);
		font-size: clamp(1.5rem, 7vw, 2.125rem);
		font-weight: var(--fw-medium);
		letter-spacing: -0.035em;
		line-height: 1.1;
	}

	.site-header__nav-link::before {
		content: counter(ri-nav, decimal-leading-zero);
		align-self: flex-start;
		padding-top: 0.45rem;
		font-size: 0.75rem;
		font-weight: var(--fw-regular);
		letter-spacing: 0;
		color: var(--color-text-muted);
	}

	/* The bar's dropdown chevron reads as a "go to section" arrow in the panel. */
	.site-header__nav-chevron {
		margin-left: auto;
		opacity: 0.35;
		transform: rotate(-90deg);
		transition:
			transform var(--transition-fast),
			opacity var(--transition-fast);
	}

	.site-header__nav-link:hover .site-header__nav-chevron,
	.site-header__nav-link:focus-visible .site-header__nav-chevron {
		opacity: 1;
		transform: translateX(4px) rotate(-90deg);
	}

	.site-header__nav-footer {
		display: flex;
		flex-direction: column;
		gap: var(--space-md);
		opacity: 0;
		transform: translateY(14px);
		transition:
			opacity 0.45s var(--ease-default),
			transform 0.45s var(--ease-default);
	}

	.site-header__nav.is-open .site-header__nav-footer {
		opacity: 1;
		transform: none;
		transition-delay: 0.36s;
	}

	.site-header__nav-cta {
		display: inline-flex;
		align-items: center;
		justify-content: space-between;
		gap: var(--space-md);
		padding: 0.6rem 0.6rem 0.6rem 1.5rem;
		border-radius: var(--radius-full);
		background-color: var(--color-bg-dark);
		color: var(--color-text-light);
		font-size: var(--fs-body);
		font-weight: var(--fw-medium);
		line-height: 1.2;
		transition: opacity var(--transition-fast);
	}

	.site-header__nav-cta:hover,
	.site-header__nav-cta:focus-visible {
		opacity: 0.88;
	}

	.site-header__nav-cta-icon {
		display: inline-flex;
		align-items: center;
		justify-content: center;
		width: 2.25rem;
		height: 2.25rem;
		border-radius: var(--radius-full);
		background-color: var(--color-bg-light);
		color: var(--color-text-dark);
		flex-shrink: 0;
	}

	.site-header__lang-toggle {
		display: inline-flex;
	}

	.site-header__cta {
		display: none;
	}

	@media (prefers-reduced-motion: reduce) {
		.site-header__nav,
		.site-header__nav-item,
		.site-header__nav-footer,
		.site-header__nav-chevron {
			transition: none;
		}

		.site-header__nav-item,
		.site-header__nav-footer {
			transform: none;
		}
	}
}

/* Desktop: horizontal nav + CTA, burger hidden */
@media (min-width: 768px) {
	.site-header__nav {
		display: block;
		position: static;
		padding: 0;
		background: none;
		transform: none;
		visibility: visible;
		opacity: 1;
		margin-left: auto;
		margin-right: var(--space-lg);
	}

	.site-header__lang-toggle {
		display: inline-flex;
	}

	.site-header__cta {
		display: inline-flex;
	}

	.site-header__burger {
		display: none;
	}
}