/* 北京中道成科技 — 全站导航栏 */
:root {
	--nav-primary: #08616d;
	--nav-primary-dark: #054a54;
	--nav-gold: #c9a84c;
	--nav-dark: #1a2b3c;
	--nav-height: 72px;
}

.site-navbar {
	background: rgba(255, 255, 255, 0.97) !important;
	backdrop-filter: blur(8px);
	border-bottom: 2px solid var(--nav-primary);
	box-shadow: 0 2px 16px rgba(8, 97, 109, 0.08) !important;
	padding: 0;
	min-height: var(--nav-height);
	transition: box-shadow 0.3s;
}
.site-navbar .container {
	position: relative;
}
.site-navbar .navbar-brand {
	padding: 8px 0;
	margin-right: 24px;
}
.site-navbar .navbar-brand img {
	max-height: 52px;
	width: auto;
	height: auto !important;
	transition: opacity 0.3s;
}
.site-navbar .navbar-brand:hover img {
	opacity: 0.85;
}

/* 导航菜单 */
.site-navbar .navbar-nav {
	align-items: center;
}
.site-navbar .navbar-nav .nav-item {
	position: relative;
	margin: 0 2px;
}
.site-navbar .navbar-nav .nav-link {
	color: var(--nav-dark) !important;
	font-size: 0.929rem;
	font-weight: 600;
	padding: 24px 16px !important;
	letter-spacing: 1px;
	transition: color 0.3s;
	position: relative;
}
.site-navbar .navbar-nav .nav-link::after {
	content: '';
	position: absolute;
	left: 16px;
	right: 16px;
	bottom: 12px;
	height: 2px;
	background: var(--nav-primary);
	transform: scaleX(0);
	transition: transform 0.3s ease;
}
.site-navbar .navbar-nav .nav-link:hover {
	color: var(--nav-primary) !important;
}
.site-navbar .navbar-nav .nav-link:hover::after {
	transform: scaleX(1);
}
.site-navbar .navbar-nav .nav-item.active .nav-link {
	color: var(--nav-primary) !important;
}
.site-navbar .navbar-nav .nav-item.active .nav-link::after {
	transform: scaleX(1);
	background: linear-gradient(90deg, var(--nav-primary), var(--nav-gold));
}

/* 移动端折叠按钮 */
.site-navbar .navbar-toggler {
	border: 1px solid #d0dde0;
	padding: 6px 10px;
	border-radius: 4px;
	outline: none;
}
.site-navbar .navbar-toggler:focus {
	box-shadow: 0 0 0 2px rgba(8, 97, 109, 0.2);
}
.site-navbar .navbar-toggler-icon {
	background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='%2308616d' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 移动端菜单 */
@media only screen and (max-width: 991px) {
	.site-navbar .navbar-collapse {
		background: #fff;
		border-top: 1px solid #e8eef0;
		margin: 0 -15px;
		padding: 8px 15px 16px;
		box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
	}
	.site-navbar .navbar-nav .nav-link {
		padding: 12px 8px !important;
		border-bottom: 1px solid #f0f4f5;
	}
	.site-navbar .navbar-nav .nav-link::after {
		display: none;
	}
	.site-navbar .navbar-nav .nav-item.active .nav-link {
		background: rgba(8, 97, 109, 0.06);
		border-left: 3px solid var(--nav-primary);
		padding-left: 12px !important;
	}
	.site-navbar .navbar-nav .nav-item:last-child .nav-link {
		border-bottom: none;
	}
}

/* 占位高度 */
.site-header-spacer {
	height: var(--nav-height);
}
@media only screen and (max-width: 576px) {
	:root {
		--nav-height: 64px;
	}
	.site-navbar .navbar-brand img {
		max-height: 44px;
	}
}