/* About 二级导航 — 白底 + 下划线 Tab（现代简洁） */

:root {
	--menu-sub-brand: #1d5198;
	--menu-sub-brand-hover: #16467f;
	--menu-sub-border: #e8ebf0;
	/* Hero 底部分隔线（旧站 #b0b0b0，现调浅） */
	--menu-sub-hero-separator: #cfd4da;
	--menu-sub-border-strong: #dde3ea;
	--menu-sub-text: #64748b;
	--menu-sub-text-strong: #334155;
	--menu-sub-divider: #cbd2dc;
	--menu-sub-surface: #f8fafc;
	--menu-sub-bar-height: 52px;
}

/* Hero 底部分隔线（旧 banner-sub #site-banner-sub-root border-bottom） */
.page-hero {
	border-bottom: 5px solid var(--menu-sub-hero-separator);
}

.page-hero ~ .menu {
	margin-top: 0;
	border-top: none;
	position: relative;
	z-index: 2;
}

/* Hero 底缘叠层（与首页产品条同思路：首屏可见） */
.page-hero:has(.page-hero__banner-footer > .menu) {
	border-bottom: none;
}

.page-hero__banner-footer > .menu {
	width: 100%;
	margin-bottom: 0;
	border-top: none;
	position: relative;
	z-index: 5;
}

/* Hero 底缘叠层（与首页产品条同思路：首屏可见） */
.page-hero:has(.page-hero__banner-footer > .menu) {
	border-bottom: none;
}

.page-hero__banner-footer > .menu {
	width: 100%;
	margin-bottom: 0;
	border-top: none;
	position: relative;
	z-index: 5;
}

main.pushable-content > .menu,
main:not(.pushable-content) > .menu {
	width: 100vw;
	max-width: 100vw;
	margin-left: calc(50% - 50vw);
	margin-right: calc(50% - 50vw);
}

.menu {
	width: 100%;
	margin-bottom: 32px;
	background: #fff;
	border-top: 1px solid var(--menu-sub-border);
	border-bottom: 1px solid var(--menu-sub-border-strong);
	box-shadow: 0 1px 0 rgba(255, 255, 255, 0.9);
}

.menu__inner {
	position: relative;
	display: flex;
	align-items: center;
	gap: 12px;
	min-height: var(--menu-sub-bar-height);
	width: var(--page-shell-width);
	max-width: var(--page-shell-max);
	margin-inline: auto;
	padding-inline: var(--container-gutter);
	box-sizing: border-box;
}

.menu__crumbs {
	display: flex;
	align-items: center;
	flex: 0 1 auto;
	min-width: 0;
	margin: 0;
	padding: 0;
	list-style: none;
}

.menu__crumb-item {
	display: flex;
	align-items: center;
	min-width: 0;
}

.menu__crumb-item--segment {
	flex: 0 1 auto;
	max-width: 100%;
}

.menu__crumb-sep {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	flex-shrink: 0;
	width: 18px;
	color: var(--menu-sub-divider);
}

.menu__crumb-sep .menu__crumb-icon {
	width: 14px;
	height: 14px;
	stroke-width: 2;
	opacity: 0.7;
}

.menu__crumb {
	display: inline-flex;
	align-items: center;
	gap: 7px;
	max-width: min(100%, 280px);
	min-height: 36px;
	padding: 6px 12px;
	border-radius: 8px;
	font-size: 13px;
	font-weight: 400;
	line-height: 1.3;
	color: var(--menu-sub-text);
	text-decoration: none;
	transition:
		color 0.15s ease,
		background-color 0.15s ease;
}

.menu__crumb-icon {
	width: 16px;
	height: 16px;
	flex-shrink: 0;
	color: var(--menu-sub-brand);
	opacity: 0.82;
}

.menu__crumb-icon--product {
	width: 14px;
	height: 21px;
}

.menu__crumb-icon--product {
	width: 14px;
	height: 21px;
}

.menu__crumb-label {
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.menu__crumb--home {
	justify-content: center;
	width: 36px;
	height: 36px;
	padding: 0;
	border: 1px solid var(--menu-sub-border);
	background: var(--menu-sub-surface);
}

.menu__crumb--home .menu__crumb-icon {
	width: 17px;
	height: 17px;
	opacity: 1;
}

.menu__crumb--home:hover {
	background: rgba(29, 81, 152, 0.08);
	border-color: rgba(29, 81, 152, 0.18);
	color: var(--menu-sub-brand);
}

.menu__crumb--home:focus-visible {
	outline: 2px solid rgba(29, 81, 152, 0.35);
	outline-offset: 2px;
}

.menu__crumb--link:hover {
	color: var(--menu-sub-brand);
	background: rgba(29, 81, 152, 0.06);
}

.menu__crumb--link:hover .menu__crumb-icon {
	opacity: 1;
}

.menu__crumb--current {
	color: var(--menu-sub-text-strong);
	font-weight: 500;
	background: rgba(29, 81, 152, 0.08);
	border: 1px solid rgba(29, 81, 152, 0.12);
}

.menu__crumb--current .menu__crumb-icon {
	opacity: 1;
}

.menu__crumb--link:focus-visible,
.menu__crumb--home:focus-visible {
	outline: 2px solid rgba(29, 81, 152, 0.35);
	outline-offset: 2px;
}

.menu__tabs {
	display: flex;
	align-items: stretch;
	justify-content: flex-end;
	flex: 0 1 auto;
	margin-left: auto;
	flex-wrap: nowrap;
	gap: 0;
	max-width: 100%;
	min-width: 0;
	min-height: var(--menu-sub-bar-height);
	overflow-x: auto;
	overflow-y: visible;
	scrollbar-width: none;
	padding-left: 0;
}

.menu__tabs::-webkit-scrollbar {
	display: none;
}

.menu--split-current .menu__crumbs {
	flex: 1 1 auto;
	min-width: 0;
}

/* SKU 详情：面包屑（到系列）+ 当前型号 + 系列 Tab 同排 */
.menu--split-with-tabs .menu__crumbs {
	flex: 0 1 auto;
}

.menu--split-with-tabs .menu__current {
	margin-left: 0;
	flex: 0 0 auto;
}

.menu--split-with-tabs .menu__current-label {
	height: 36px;
	padding: 6px 12px;
	border-radius: 8px;
	font-size: 13px;
	font-weight: 500;
	color: var(--menu-sub-text-strong);
	background: rgba(29, 81, 152, 0.08);
	border: 1px solid rgba(29, 81, 152, 0.12);
}

.menu--split-with-tabs .menu__current-label::after {
	display: none;
}

.menu--split-with-tabs .menu__tabs {
	margin-left: auto;
}

/* SKU 详情：面包屑（到系列）+ 当前型号 + 系列 Tab 同排 */
.menu--split-with-tabs .menu__crumbs {
	flex: 0 1 auto;
}

.menu--split-with-tabs .menu__current {
	margin-left: 0;
	flex: 0 0 auto;
}

.menu--split-with-tabs .menu__current-label {
	height: 36px;
	padding: 6px 12px;
	border-radius: 8px;
	font-size: 13px;
	font-weight: 500;
	color: var(--menu-sub-text-strong);
	background: rgba(29, 81, 152, 0.08);
	border: 1px solid rgba(29, 81, 152, 0.12);
}

.menu--split-with-tabs .menu__current-label::after {
	display: none;
}

.menu--split-with-tabs .menu__tabs {
	margin-left: auto;
}

.menu__current {
	display: flex;
	align-items: stretch;
	justify-content: flex-end;
	flex: 0 0 auto;
	margin-left: auto;
	min-height: var(--menu-sub-bar-height);
}

.menu__current-label {
	position: relative;
	display: inline-flex;
	align-items: center;
	gap: 7px;
	flex-shrink: 0;
	height: var(--menu-sub-bar-height);
	padding: 0 18px;
	font-size: 14px;
	font-weight: 500;
	line-height: 1.3;
	color: var(--menu-sub-brand);
	white-space: nowrap;
}

.menu__current-label .menu__crumb-icon {
	width: 16px;
	height: 16px;
	opacity: 1;
}

.menu__current-label::after {
	content: '';
	position: absolute;
	left: 18px;
	right: 18px;
	bottom: 0;
	height: 3px;
	border-radius: 5px 5px 0 0;
	background: var(--menu-sub-brand);
}

.menu__tabs a .menu__tab-label {
	display: inline;
	line-height: 1.3;
	font-family: var(--site-ui-font, 'Segoe UI', system-ui, -apple-system, 'Microsoft YaHei', 'PingFang SC', sans-serif);
}

.menu__tabs a {
	position: relative;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	flex-shrink: 0;
	height: var(--menu-sub-bar-height);
	padding: 0 18px;
	border: none;
	border-radius: 0;
	background: transparent;
	font-family: var(--site-ui-font, 'Segoe UI', system-ui, -apple-system, 'Microsoft YaHei', 'PingFang SC', sans-serif);
	font-size: 14px;
	font-weight: 500;
	line-height: 1.3;
	color: var(--menu-sub-text);
	text-decoration: none;
	white-space: nowrap;
	user-select: none;
	-webkit-tap-highlight-color: transparent;
	transition:
		color 0.18s ease,
		background-color 0.18s ease;
}

.menu__tabs a::selection,
.menu__tabs a .menu__tab-label::selection {
	background: rgba(29, 81, 152, 0.18);
	color: inherit;
}

.menu__tabs a::after {
	content: '';
	position: absolute;
	left: 18px;
	right: 18px;
	bottom: 0;
	height: 3px;
	border-radius: 5px 5px 0 0;
	background: transparent;
	transform: scaleX(0.35);
	opacity: 0;
	transition:
		transform 0.22s ease,
		opacity 0.22s ease,
		background-color 0.18s ease;
}

.menu__tabs a:hover {
	color: var(--menu-sub-brand);
	background: rgba(29, 81, 152, 0.04);
}

.menu__tabs a:hover::after {
	background: rgba(29, 81, 152, 0.35);
	transform: scaleX(1);
	opacity: 1;
}

.menu__tabs a.is-active,
.menu__tabs a[aria-current='page'] {
	color: var(--menu-sub-brand);
	background: transparent;
}

.menu__tabs a.is-active:hover,
.menu__tabs a[aria-current='page']:hover,
.menu__tabs a.is-active:focus,
.menu__tabs a[aria-current='page']:focus,
.menu__tabs a.is-active:active,
.menu__tabs a[aria-current='page']:active {
	color: var(--menu-sub-brand);
	background: transparent;
}

.menu__tabs a.is-active::after,
.menu__tabs a[aria-current='page']::after {
	background: var(--menu-sub-brand);
	transform: scaleX(1);
	opacity: 1;
}

@media (min-width: 961px) {
	.menu__tabs a:last-child {
		padding-right: 0;
	}

	.menu__tabs a:last-child::after {
		right: 0;
	}

	.menu--split-current .menu__current-label {
		padding-right: 0;
	}

	.menu--split-current .menu__current-label::after {
		right: 0;
	}
}

@media (max-width: 960px) {
	.menu__inner {
		flex-wrap: wrap;
		align-content: flex-start;
		padding-block: 8px;
	}

	.menu__crumbs {
		flex: 1 1 auto;
		flex-wrap: wrap;
		row-gap: 4px;
	}

	.menu__crumb {
		max-width: min(100%, 220px);
		min-height: 32px;
		padding: 5px 10px;
		font-size: 12px;
	}

	.menu__crumb--home {
		width: 32px;
		height: 32px;
	}

	.menu__tabs {
		flex: 1 0 100%;
		margin-left: 0;
		justify-content: flex-start;
		overflow-x: auto;
		min-height: 44px;
		margin-top: 2px;
	}

	.menu--split-current .menu__current {
		flex: 0 0 auto;
		margin-left: auto;
		min-height: 44px;
	}

	.menu--split-with-tabs .menu__current {
		margin-left: 0;
	}

	.menu--split-with-tabs .menu__tabs {
		flex: 1 0 100%;
		margin-left: 0;
		margin-top: 2px;
	}

	.menu--split-with-tabs .menu__current {
		margin-left: 0;
	}

	.menu--split-with-tabs .menu__tabs {
		flex: 1 0 100%;
		margin-left: 0;
		margin-top: 2px;
	}

	.menu--split-current .menu__current-label {
		height: 44px;
		padding: 0 14px;
		font-size: 13px;
	}

	.menu--split-current .menu__current-label::after {
		left: 14px;
		right: 14px;
	}

	.menu__tabs a {
		height: 44px;
		padding: 0 14px;
		font-size: 13px;
	}

	.menu__tabs a::after {
		left: 14px;
		right: 14px;
	}
}

@media (max-width: 640px) {
	.menu {
		margin-bottom: 24px;
	}

	.menu__crumb {
		max-width: min(100%, 180px);
		font-size: 11px;
		gap: 5px;
		padding: 4px 8px;
	}

	.menu__crumb-icon {
		width: 14px;
		height: 14px;
	}

	.menu__tabs a {
		padding: 0 12px;
		font-size: 12px;
	}

	.menu__tabs a::after {
		left: 12px;
		right: 12px;
		height: 2px;
	}
}

@media (prefers-reduced-motion: reduce) {
	.menu__tabs a::after {
		transition: none;
	}
}

html[dir='rtl'] .menu__crumb-sep .menu__crumb-icon {
	transform: scaleX(-1);
}

html[dir='rtl'] .menu__crumb-sep .menu__crumb-icon {
	transform: scaleX(-1);
}