/* Header / primary navigation styles (used by _includes/header.html) */

.site-header {
	position: sticky;
	top: 0;
	z-index: 1000;
	background: rgba(255, 255, 255, 0.85);
	backdrop-filter: blur(10px);
}

.site-header .nav-inner {
	max-width: 1100px;
	margin: 0 auto;
	padding: .75rem 1.25rem;
	position: relative;
	display: flex;
	align-items: center;
	box-sizing: border-box;
}

.site-header .brand {
	display: inline-flex;
	align-items: center;
	gap: .6rem;
	text-decoration: none;
	font-weight: 600;
	line-height: 1;
	color: #111827;
}

.site-header .brand-logo {
	height: 34px;
	width: auto;
	display: block;
	transform: translateY(-2px);
}

.site-header .brand-name {
	font-size: 1.4rem;
	line-height: 1;
	display: block;
}

.site-header .main-nav {
	display: flex;
	gap: 2.5rem;
}

/* Use the desktop button for download; the nav item is mobile-only */
.site-header .main-nav .nav-download {
	display: none;
}

.site-header .nav-link {
	text-decoration: none;
	font-size: .9rem;
	font-weight: 500;
	color: #374151;
	position: relative;
	padding: .4rem .2rem;
}

.site-header .nav-link:hover {
	color: #111827;
}

.site-header .nav-link:after {
	content: "";
	position: absolute;
	left: 0;
	bottom: 0;
	height: 2px;
	width: 100%;
	background: #111827;
	transform: scaleX(0);
	transform-origin: left;
	transition: .25s;
}

.site-header .nav-link:hover:after {
	transform: scaleX(1);
}

.site-header .download-button {
	margin-left: auto;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	height: 40px;
	padding: 0 14px;
	border-radius: 10px;
	background: #2563eb;
	color: #ffffff;
	font-size: .9rem;
	font-weight: 600;
	text-decoration: none;
	box-shadow: none;
	transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease;
}

.site-header .download-button:hover {
	background: #1d4ed8;
	transform: translateY(-1px);
	box-shadow: none;
}

.site-header .download-button:focus-visible {
	outline: 3px solid rgba(37, 99, 235, 0.35);
	outline-offset: 4px;
}

.site-header .hamburger {
	display: none;
	position: relative;
	width: 42px;
	height: 42px;
	border: 0;
	background: rgba(17, 24, 39, 0.05);
	border-radius: 10px;
	cursor: pointer;
	-webkit-tap-highlight-color: transparent;
}

.site-header .hamburger .bar {
	position: absolute;
	left: 10px;
	right: 10px;
	height: 2.5px;
	background: #111827;
	border-radius: 2px;
	transition: .35s;
}

.site-header .hamburger .bar:nth-child(1) {
	top: 13px;
}

.site-header .hamburger .bar:nth-child(2) {
	top: 20px;
}

.site-header .hamburger .bar:nth-child(3) {
	top: 27px;
}

.site-header .hamburger.is-open .bar:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}

.site-header .hamburger.is-open .bar:nth-child(2) {
	opacity: 0;
}

.site-header .hamburger.is-open .bar:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 641px) {
	/* Desktop: center nav absolutely across full header width */
	.site-header {
		position: fixed;
		left: 0;
		right: 0;
	}

	body {
		/* Offset page content for fixed header */
		padding-top: 80px;
	}

	.site-header .nav-inner {
		padding-top: 1.45rem;
		padding-right: 1.25rem;
		padding-bottom: .9rem;
		padding-left: 1.25rem;
	}

	.site-header .download-button {
		min-width: 80px;
		height: 44px;
		padding: 0 22px;
		border-radius: 12px;
	}

	.site-header .main-nav {
		position: absolute;
		left: 50%;
		top: 50%;
		transform: translate(-50%, -50%);
	}

	.site-header .hamburger {
		display: none;
	}
}

@media (max-width: 640px) {
	/* Mobile header: flex layout so hamburger can sit at true far right */
	.site-header .download-button {
		display: none;
	}

	.site-header .nav-inner {
		display: flex;
		align-items: center;
		padding: .65rem .65rem;
		padding-right: 1.25rem;
	}

	.site-header .brand {
		flex: 1 1 auto;
		min-width: 0;
	}

	.site-header .brand-name {
		max-width: 52vw;
		overflow: hidden;
		text-overflow: ellipsis;
		white-space: nowrap;
	}

	.site-header .main-nav {
		flex: 0 0 auto;
	}

	.site-header .hamburger {
		display: inline-block;
		margin-left: auto;
		margin-right: 0;
	}

	/* When nav closed keep it centered visually invisible (will drop below when open) */
	.site-header .main-nav {
		position: absolute;
		top: 100%;
		left: 0;
		right: 0;
		background: rgba(255, 255, 255, 0.95);
		backdrop-filter: blur(12px);
		display: flex;
		flex-direction: column;
		align-items: center;
		gap: 0;
		padding: 0;
		max-height: 0;
		overflow: hidden;
		transition: max-height .4s ease;
		box-shadow: 0 4px 18px -4px rgba(0, 0, 0, 0.08);
		border-bottom: 1px solid rgba(0, 0, 0, 0.06);
	}

	.site-header .main-nav .nav-link {
		width: 100%;
		text-align: center;
		padding: 1rem 0;
		font-size: 1rem;
	}

	.site-header .main-nav .nav-download {
		display: block;
		width: calc(100% - 1.5rem);
		margin: .75rem .75rem .25rem;
		border-radius: 12px;
		background: #2563eb;
		color: #ffffff;
		font-weight: 700;
		box-shadow: 0 10px 24px rgba(37, 99, 235, 0.22);
	}

	.site-header .main-nav .nav-download:hover {
		background: #1d4ed8;
	}

	.site-header .main-nav .nav-download:focus-visible {
		outline: 3px solid rgba(37, 99, 235, 0.35);
		outline-offset: 4px;
	}

	.site-header .main-nav .nav-link:after {
		display: none;
	}

	.site-header .main-nav.is-open {
		max-height: 320px;
	}
}