/* ==========================================================================
   Header — Site navigation and branding
   ========================================================================== */

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.site-header {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	z-index: var(--header-z-index);
}

.site-nav {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: var(--header-padding-y) var(--header-padding-x) 0;
}

/* --------------------------------------------------------------------------
   Left — Navigation menu
   -------------------------------------------------------------------------- */

.site-nav__left {
	flex: 1;
}

.site-nav__menu {
	display: flex;
	align-items: center;
	gap: var(--space-md);
}

.site-nav__menu li a {
	display: flex;
	align-items: center;
	gap: var(--space-xs);
	font-family: var(--font-body);
	font-weight: var(--font-weight-medium);
	font-size: var(--text-sm);
	text-transform: uppercase;
	line-height: 1;
	letter-spacing: 0;
	color: var(--color-white);
	transition: opacity var(--duration-fast) var(--easing-default);
}

.site-nav__menu li a:hover {
	opacity: 0.7;
}

.site-nav__menu li a:focus-visible {
	outline: 2px solid var(--color-white);
	outline-offset: 4px;
	border-radius: var(--radius-sm);
}

.menu-icon {
	display: flex;
	align-items: center;
	width: 12px;
	height: 12px;
}

.menu-icon svg {
	width: 12px;
	height: 12px;
	stroke: currentColor;
}

/* --------------------------------------------------------------------------
   Center — Logo
   -------------------------------------------------------------------------- */

.site-nav__logo {
	flex: 0 0 auto;
}

.site-nav__logo a {
	display: block;
	line-height: 0;
}

.site-nav__logo svg {
	width: 96px;
	height: 26px;
	fill: var(--color-white);
}

.site-nav__logo img {
	width: 96px;
	height: 26px;
	object-fit: contain;
}

/* --------------------------------------------------------------------------
   Right — CTA button
   -------------------------------------------------------------------------- */

.site-nav__cta {
	flex: 1;
	display: flex;
	justify-content: flex-end;
}

.btn-cta {
	display: inline-flex;
	align-items: center;
	gap: 4px;
	height: 44px;
	padding: 0 16px;
	background-color: var(--glass-bg);
	backdrop-filter: var(--glass-blur);
	-webkit-backdrop-filter: var(--glass-blur);
	border: none;
	border-top: 1px solid var(--glass-border);
	border-radius: var(--radius-md);
	box-shadow: var(--glass-shadow);
	font-family: var(--font-body);
	font-weight: var(--font-weight-medium);
	font-size: var(--text-sm);
	text-transform: uppercase;
	line-height: 1;
	color: var(--color-white);
	transition: background-color 200ms ease;
}

.btn-cta:hover {
	background-color: rgba(255, 255, 255, 0.45);
}

.btn-cta:focus-visible {
	outline: 2px solid var(--color-white);
	outline-offset: 4px;
}

.btn-cta__icon {
	display: flex;
	align-items: center;
	width: 14px;
	height: 14px;
}

.btn-cta__icon svg {
	width: 14px;
	height: 14px;
	fill: currentColor;
}

.btn-cta__text {
	white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Variante « header-on-light » (pages a fond clair : archive et single projet)
   -------------------------------------------------------------------------- */

.header-on-light .site-nav__menu li a {
	color: var(--color-black);
}

.header-on-light .site-nav__menu li a:focus-visible {
	outline-color: var(--color-black);
}

.header-on-light .site-nav__logo svg {
	/* Le logo est un PNG embarque dans le SVG (pattern), donc fill CSS sans effet.
	   On force la couleur via filter:brightness(0) qui rend tous les pixels noirs
	   en preservant l'alpha (logo noir net sur fond clair). */
	fill: var(--color-black);
	filter: brightness(0);
}

.header-on-light .btn-cta {
	background-color: var(--color-primary);
	backdrop-filter: none;
	-webkit-backdrop-filter: none;
	border-top: 1px solid rgba(255, 255, 255, 0.33);
	box-shadow: none;
	color: var(--color-white);
}

.header-on-light .btn-cta:hover {
	background-color: var(--color-primary);
	opacity: 0.85;
}

.header-on-light .site-nav__toggle-bar {
	background-color: var(--color-black);
}

/* --------------------------------------------------------------------------
   Mobile toggle (burger)
   -------------------------------------------------------------------------- */

.site-nav__toggle {
	display: none;
	flex-direction: column;
	justify-content: center;
	gap: 5px;
	width: 32px;
	height: 32px;
	padding: 4px;
}

.site-nav__toggle-bar {
	display: block;
	width: 100%;
	height: 2px;
	background-color: var(--color-white);
	border-radius: 1px;
	transition: transform var(--duration-base) var(--easing-default),
	            opacity var(--duration-base) var(--easing-default);
}

/* --------------------------------------------------------------------------
   Responsive — Mobile (< 768px)
   -------------------------------------------------------------------------- */

@media (max-width: 767px) {
	.site-nav {
		padding: var(--space-sm) var(--space-sm);
	}

	.site-nav__left {
		position: fixed;
		top: 0;
		left: 0;
		width: 100%;
		height: 100vh;
		display: flex;
		align-items: center;
		justify-content: center;
		background-color: var(--color-black);
		transform: translateX(-100%);
		transition: transform var(--duration-base) var(--easing-default);
		z-index: calc(var(--header-z-index) + 10);
	}

	.site-nav.toggled .site-nav__left {
		transform: translateX(0);
	}

	.site-nav__menu {
		flex-direction: column;
		gap: var(--space-lg);
	}

	.site-nav__menu li a {
		font-size: var(--text-xl);
	}

	.site-nav__cta {
		display: none;
	}

	.site-nav__toggle {
		display: flex;
	}

	/* Burger → X animation */
	.site-nav.toggled .site-nav__toggle-bar:nth-child(1) {
		transform: translateY(7px) rotate(45deg);
	}

	.site-nav.toggled .site-nav__toggle-bar:nth-child(2) {
		opacity: 0;
	}

	.site-nav.toggled .site-nav__toggle-bar:nth-child(3) {
		transform: translateY(-7px) rotate(-45deg);
	}
}