/**
 * Ethantheme Header / Footer 样式
 * ----------------------------------------------------
 * 依赖：tokens.css / components.css
 *
 * 结构：
 * .eth-header
 *   .eth-header__inner (eth-container, flex)
 *     .eth-header__logo
 *     .eth-header__nav
 *       .eth-menu (ul)
 *         .eth-menu-item (li)
 *           .eth-menu-link (a)
 *           .eth-menu-toggle (button, has-children 时出现)
 *           .eth-sub-menu (ul, 二级)
 *             .eth-sub-menu--nested (ul, 三级侧展开)
 *           .eth-mega-menu (div, mega menu 预留)
 *     .eth-header__actions
 *       .eth-header__cta (eth-btn)
 *     .eth-header__toggle (移动端汉堡)
 * .eth-modal (FluentForm 模态)
 * .eth-footer
 *   .eth-footer__inner
 *     .eth-footer__main (grid 4 col)
 *     .eth-footer__bottom
 */

/* =========================================================
 * 1. Header 容器
 * ========================================================= */
.eth-header {
	position: relative;
	z-index: var(--eth-z-header);
	background: var(--eth-bg-surface);
	border-bottom: 1px solid var(--eth-border);
	width: 100%;
}

.eth-header--sticky {
	position: sticky;
	top: 0;
	transition: box-shadow var(--eth-transition-m),
		background var(--eth-transition-m);
}

.eth-header--sticky.eth-header--scrolled {
	box-shadow: var(--eth-shadow-m);
}

/* 首页透明覆盖 Hero */
.eth-header--transparent {
	background: transparent;
	border-bottom-color: transparent;
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
}

.eth-header--transparent .eth-menu-link,
.eth-header--transparent .eth-header__logo-text,
.eth-header--transparent .eth-header__toggle span {
	color: var(--eth-light);
}

.eth-header--transparent.eth-header--scrolled {
	background: var(--eth-bg-surface);
	border-bottom-color: var(--eth-border);
}

.eth-header--transparent.eth-header--scrolled .eth-menu-link,
.eth-header--transparent.eth-header--scrolled .eth-header__logo-text,
.eth-header--transparent.eth-header--scrolled .eth-header__toggle span {
	color: var(--eth-text-title);
}

.eth-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--eth-space-m);
	padding-block: var(--eth-space-xs);
	min-height: 6rem;
}

/* =========================================================
 * 2. Logo
 * ========================================================= */
.eth-header__logo {
	flex-shrink: 0;
	display: flex;
	align-items: center;
}

.eth-header__logo img {
	max-height: 4rem;
	width: auto;
}

.eth-header__logo-text {
	font-size: var(--eth-fs-h4);
	font-weight: var(--eth-fw-bold);
	color: var(--eth-text-title);
	text-decoration: none;
}

/* =========================================================
 * 3. 主导航
 * ========================================================= */
.eth-header__nav {
	flex: 1;
	display: flex;
	justify-content: center;
	/* 0.8.1：不再作为 mega 面板的定位上下文。
	   若在此设 position:relative，面板的 left:0/right:0/width:100% 会被限制在
	   nav 自身宽度（flex:1 剩余空间 ≈ 980px），而非全宽。
	   定位上下文改为 .eth-header（全宽），见 .eth-menu-item--mega 面板规则。 */
}

.eth-menu {
	display: flex;
	list-style: none;
	margin: 0;
	padding: 0;
	gap: var(--eth-space-xs);
}

.eth-menu-item {
	position: relative;
	display: flex;
	align-items: center;
}

.eth-menu-link {
	display: flex;
	align-items: center;
	padding: 0.6em 0.9em;
	color: var(--eth-text-title);
	font-size: var(--eth-fs-small);
	font-weight: var(--eth-fw-medium);
	text-decoration: none;
	border-radius: var(--eth-radius-s);
	transition: color var(--eth-transition-s),
		background var(--eth-transition-s);
}

.eth-menu-link:hover,
.eth-menu-link[aria-current="page"] {
	color: var(--eth-primary);
	background: var(--eth-primary-5);
}

/* 子菜单展开按钮（桌面隐藏，移动端显示） */
.eth-menu-toggle {
	display: none;
	background: transparent;
	border: 0;
	padding: 0.4em;
	cursor: pointer;
	color: inherit;
}

/* =========================================================
 * 4. 二级菜单（横向下拉）
 * ========================================================= */
.eth-sub-menu {
	position: absolute;
	top: 100%;
	left: 0;
	min-width: 200px;
	background: var(--eth-bg-surface);
	border: 1px solid var(--eth-border);
	border-radius: var(--eth-radius-m);
	box-shadow: var(--eth-shadow-l);
	padding: var(--eth-space-2xs);
	margin: 0;
	list-style: none;
	opacity: 0;
	visibility: hidden;
	transform: translateY(8px);
	transition: opacity var(--eth-transition-s),
		visibility var(--eth-transition-s),
		transform var(--eth-transition-s);
	z-index: var(--eth-z-dropdown);
}

.eth-menu-item--has-children:hover > .eth-sub-menu,
.eth-menu-item--has-children:focus-within > .eth-sub-menu,
.eth-menu-item--has-children.is-expanded > .eth-sub-menu {
	opacity: 1;
	visibility: visible;
	transform: translateY(0);
}

.eth-sub-menu .eth-menu-item {
	width: 100%;
}

.eth-sub-menu .eth-menu-link {
	padding: 0.5em 0.8em;
	width: 100%;
	border-radius: var(--eth-radius-s);
}

/* =========================================================
 * 5. 三级菜单（侧向展开）
 * ========================================================= */
.eth-sub-menu--nested {
	top: 0;
	left: 100%;
	transform: translateX(-8px);
	margin-left: var(--eth-space-2xs);
}

.eth-menu-item--has-children:hover > .eth-sub-menu--nested,
.eth-menu-item--has-children:focus-within > .eth-sub-menu--nested,
.eth-menu-item--has-children.is-expanded > .eth-sub-menu--nested {
	transform: translateX(0);
}

/* =========================================================
 * 6. Mega Menu 预留
 * --------------------------------------------------------
 * 当 .eth-menu-item--mega 存在时，.eth-mega-menu 容器全宽下拉
 * 实际内容由 filter 注入
 * ========================================================= */
.eth-menu-item--mega {
	position: static;
}

/* =========================================================
 * 7. CTA 按钮
 * ========================================================= */
.eth-header__actions {
	flex-shrink: 0;
	display: flex;
	align-items: center;
	gap: var(--eth-space-xs);
}

.eth-header__cta {
	white-space: nowrap;
}

/* =========================================================
 * 8. 移动端汉堡按钮
 * ========================================================= */
.eth-header__toggle {
	display: none;
	flex-direction: column;
	justify-content: center;
	gap: 5px;
	width: 40px;
	height: 40px;
	background: transparent;
	border: 0;
	cursor: pointer;
	padding: 8px;
}

.eth-header__toggle span {
	display: block;
	width: 24px;
	height: 2px;
	background: var(--eth-text-title);
	border-radius: 2px;
	transition: transform var(--eth-transition-s),
		opacity var(--eth-transition-s);
}

.eth-header__toggle[aria-expanded="true"] span:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}
.eth-header__toggle[aria-expanded="true"] span:nth-child(2) {
	opacity: 0;
}
.eth-header__toggle[aria-expanded="true"] span:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

/* =========================================================
 * 9. 响应式（移动端）
 * --------------------------------------------------------
 * 992px 以下隐藏横向菜单，显示汉堡
 * 导航变为竖向抽屉
 * ========================================================= */
@media (max-width: 992px) {
	.eth-header__toggle {
		display: flex;
	}

	.eth-header__nav {
		position: fixed;
		top: 6rem;
		left: 0;
		right: 0;
		bottom: 0;
		background: var(--eth-bg-surface);
		flex-direction: column;
		justify-content: flex-start;
		padding: var(--eth-space-m);
		overflow-y: auto;
		transform: translateX(100%);
		transition: transform var(--eth-transition-m);
		z-index: var(--eth-z-header);
	}

	.eth-header__nav.is-open {
		transform: translateX(0);
	}

	.eth-menu {
		flex-direction: column;
		width: 100%;
		gap: 0;
	}

	.eth-menu-item {
		width: 100%;
		flex-wrap: wrap;
		border-bottom: 1px solid var(--eth-border);
	}

	.eth-menu-link {
		flex: 1;
		padding: var(--eth-space-xs) var(--eth-space-2xs);
		font-size: var(--eth-fs-body);
	}

	.eth-menu-toggle {
		display: flex;
	}

	/* 移动端子菜单不再 absolute，改为展开式 */
	.eth-sub-menu,
	.eth-sub-menu--nested {
		position: static;
		opacity: 1;
		visibility: visible;
		transform: none;
		box-shadow: none;
		border: 0;
		padding-left: var(--eth-space-m);
		display: none;
		width: 100%;
	}

	.eth-menu-item--has-children.is-expanded > .eth-sub-menu,
	.eth-menu-item--has-children.is-expanded > .eth-sub-menu--nested {
		display: block;
	}

	.eth-mega-menu {
		position: static;
		opacity: 1;
		visibility: visible;
		transform: none;
		box-shadow: none;
		border: 0;
		padding: var(--eth-space-s);
		display: none;
	}

	.eth-menu-item--mega.is-expanded > .eth-mega-menu {
		display: block;
	}

	.eth-header__actions {
		order: -1;
	}
}

@media (max-width: 768px) {
	.eth-header__inner {
		min-height: 5rem;
		padding-block: var(--eth-space-2xs);
	}

	.eth-header__nav {
		top: 5rem;
	}
}

/* =========================================================
 * 10. FluentForm 模态弹窗
 * ========================================================= */
.eth-modal {
	position: fixed;
	inset: 0;
	z-index: var(--eth-z-modal);
	display: none;
	align-items: center;
	justify-content: center;
	padding: var(--eth-space-m);
}

.eth-modal.is-open {
	display: flex;
}

.eth-modal__overlay {
	position: absolute;
	inset: 0;
	background: hsla(0, 0%, 0%, 0.6);
	backdrop-filter: blur(4px);
}

.eth-modal__dialog {
	position: relative;
	background: var(--eth-bg-surface);
	border-radius: var(--eth-radius-l);
	box-shadow: var(--eth-shadow-xl);
	max-width: 560px;
	width: 100%;
	max-height: 90vh;
	overflow-y: auto;
	padding: var(--eth-space-l);
	animation: eth-modal-in var(--eth-transition-m);
}

@keyframes eth-modal-in {
	from { transform: translateY(20px); opacity: 0; }
	to   { transform: translateY(0); opacity: 1; }
}

.eth-modal__close {
	position: absolute;
	top: var(--eth-space-s);
	right: var(--eth-space-s);
	width: 36px;
	height: 36px;
	border: 0;
	border-radius: var(--eth-radius-full);
	background: var(--eth-dark-5);
	color: var(--eth-text-title);
	font-size: 1.5rem;
	line-height: 1;
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: background var(--eth-transition-s);
}

.eth-modal__close:hover {
	background: var(--eth-dark-10);
}

.eth-modal__body {
	margin-top: var(--eth-space-s);
}

/* =========================================================
 * 11. Reusable Block 模式下的微调
 * --------------------------------------------------------
 * 当 Header/Footer 用 Reusable Block 时，移除默认 padding
 * 让用户在区块编辑器中完全控制布局
 * ========================================================= */
.eth-header--block .eth-header__inner,
.eth-footer--block {
	padding: 0;
}

.eth-header--block,
.eth-footer--block {
	background: transparent;
	border: 0;
}



/* =========================================================
 * 13. Header 预设样式（classic / centered / split）
 * --------------------------------------------------------
 * .eth-header--classic  : 默认 flex，logo 左 / 菜单中 / CTA 右
 * .eth-header--centered : 两行，logo 上居中 / 菜单下居中
 * .eth-header--split    : logo 左 / 菜单+CTA 右
 * ========================================================= */

/* --- Classic（默认，复用 .eth-header__inner 的 flex 布局） --- */
.eth-header--classic .eth-header__inner {
	flex-direction: row;
}

/* --- Centered：两行布局 --- */
.eth-header--centered .eth-header__inner {
	flex-direction: column;
	gap: var(--eth-space-2xs);
}

.eth-header--centered .eth-header__top {
	display: flex;
	justify-content: center;
}

.eth-header--centered .eth-header__bottom {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: var(--eth-space-m);
}

.eth-header--centered .eth-header__nav {
	flex: 0 1 auto;
}

/* --- Split：logo 左 / 菜单+CTA 右 --- */
.eth-header--split .eth-header__inner {
	flex-direction: row;
}

.eth-header--split .eth-header__right {
	flex: 1;
	display: flex;
	align-items: center;
	justify-content: flex-end;
	gap: var(--eth-space-m);
}

.eth-header--split .eth-header__nav {
	flex: 0 1 auto;
	justify-content: flex-end;
}

/* --- 移动端：centered/split 退化为单行（logo 左 / CTA+汉堡 右） --- */
@media (max-width: 992px) {
	.eth-header--centered .eth-header__inner,
	.eth-header--split .eth-header__inner {
		flex-direction: row;
		justify-content: space-between;
		align-items: center;
	}

	.eth-header--centered .eth-header__top {
		display: flex;
	}

	/* display:contents 让 bottom/right 的子项（cta）直接成为 inner 的 flex 项 */
	.eth-header--centered .eth-header__bottom,
	.eth-header--split .eth-header__right {
		display: contents;
	}

	/* nav 已由上方 @media (max-width:992px) 通用规则处理为 fixed 抽屉 */
}

/**
 * Ethantheme Header 新增预设样式补充
 * ----------------------------------------------------
 * 作为 header.css 的补充，新增 3 套预设：
 * 4. Minimal（极简：Logo 左 / 汉堡右）
 * 5. Transparent（透明 / Logo 居中 / 菜单下）
 * 6. Bar（双层：上 Logo+CTA / 下 菜单）
 *
 * 另含：进入动画、菜单错峰动画、滚动揭示动画
 * 全部使用 var(--eth-*) CSS 变量，flat 设计
 */

/* ============================================================
 * 预设4：Minimal（极简：Logo 左 / 汉堡右）
 * 无导航无 CTA，导航走抽屉
 * ============================================================ */
.eth-header--minimal .eth-header__inner {
	flex-direction: row;
	justify-content: space-between;
	align-items: center;
}
.eth-header--minimal .eth-header__nav {
	display: flex;
	position: fixed;
	top: 0;
	right: 0;
	bottom: 0;
	width: min(90vw, 380px);
	padding: 6rem var(--eth-space-m) var(--eth-space-m);
	background: var(--eth-bg-surface);
	box-shadow: var(--eth-shadow-xl);
	overflow-y: auto;
	transform: translateX(105%);
	transition: transform var(--eth-transition-m);
	z-index: var(--eth-z-header);
}
.eth-header--minimal .eth-header__nav.is-open {
	transform: translateX(0);
}
.eth-header--minimal .eth-menu {
	width: 100%;
	flex-direction: column;
	align-items: stretch;
}
.eth-header--minimal .eth-header__actions {
	display: none;
}
/* Minimal 始终显示汉堡按钮 */
.eth-header--minimal .eth-header__toggle {
	display: flex;
	position: relative;
	z-index: calc(var(--eth-z-header) + 1);
}

/* ============================================================
 * 预设5：Transparent（透明 / Logo 居中 / 菜单下）
 * ============================================================ */
.eth-header--transparent .eth-header__inner {
	flex-direction: column;
	gap: var(--eth-space-2xs);
}
.eth-header--transparent .eth-header__top {
	display: flex;
	justify-content: center;
}
.eth-header--transparent .eth-header__bottom {
	display: flex;
	justify-content: center;
}
.eth-header--transparent .eth-header__nav {
	flex: 0 1 auto;
}

/* 透明背景样式 */
.eth-header--transparent {
	background: transparent;
	border-bottom: none;
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	z-index: var(--eth-z-header);
}
.eth-header--transparent .eth-header__logo-text,
.eth-header--transparent .eth-menu-link {
	color: var(--eth-light);
}
.eth-header--transparent .eth-header__toggle span {
	background: var(--eth-light);
}

/* 滚动后添加背景 */
.eth-header--transparent.eth-header--scrolled {
	background: var(--eth-bg-surface);
	border-bottom: 1px solid var(--eth-border);
	position: fixed;
}
.eth-header--transparent.eth-header--scrolled .eth-header__logo-text,
.eth-header--transparent.eth-header--scrolled .eth-menu-link {
	color: var(--eth-text-title);
}
.eth-header--transparent.eth-header--scrolled .eth-header__toggle span {
	background: var(--eth-text-title);
}

/* 移动端退化 */
@media (max-width: 992px) {
	.eth-header--transparent .eth-header__inner {
		flex-direction: row;
		justify-content: space-between;
	}
	.eth-header--transparent .eth-header__bottom {
		display: none;
	}
}

/* ============================================================
 * 预设6：Bar（双层：上 Logo+CTA / 下 菜单）
 * ============================================================ */
.eth-header--bar .eth-header__inner {
	flex-direction: column;
	gap: 0;
}
.eth-header--bar .eth-header__top {
	display: flex;
	flex-direction: row;
	justify-content: space-between;
	align-items: center;
	padding-block: var(--eth-space-2xs);
}
.eth-header--bar .eth-header__bottom {
	display: flex;
	justify-content: center;
	padding-bottom: var(--eth-space-2xs);
	border-top: 1px solid var(--eth-border);
}
.eth-header--bar .eth-header__nav {
	flex: 0 1 auto;
}
.eth-header--bar .eth-menu {
	gap: var(--eth-space-m);
}

/* 移动端：隐藏 bottom，用抽屉 */
@media (max-width: 992px) {
	.eth-header--bar .eth-header__inner {
		flex-direction: row;
		justify-content: space-between;
		align-items: center;
	}
	.eth-header--bar .eth-header__bottom {
		display: none;
	}
	.eth-header--bar .eth-header__top {
		padding-block: 0;
		border: none;
	}
}

/* ============================================================
 * Header 进入动画（统一）：fade-in-down
 * ============================================================ */
.eth-header:not(.eth-header--transparent) {
	animation: eth-header-enter 0.4s ease-out;
}
@keyframes eth-header-enter {
	from {
		opacity: 0;
		transform: translateY(-20px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

/* 菜单项错峰动画 */
.eth-menu > .eth-menu-item {
	animation: eth-menu-item-enter 0.3s ease-out backwards;
}
.eth-menu > .eth-menu-item:nth-child(1) { animation-delay: 0.05s; }
.eth-menu > .eth-menu-item:nth-child(2) { animation-delay: 0.1s; }
.eth-menu > .eth-menu-item:nth-child(3) { animation-delay: 0.15s; }
.eth-menu > .eth-menu-item:nth-child(4) { animation-delay: 0.2s; }
.eth-menu > .eth-menu-item:nth-child(5) { animation-delay: 0.25s; }
.eth-menu > .eth-menu-item:nth-child(6) { animation-delay: 0.3s; }
.eth-menu > .eth-menu-item:nth-child(n+7) { animation-delay: 0.35s; }

@keyframes eth-menu-item-enter {
	from {
		opacity: 0;
		transform: translateY(-8px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

/* 尊重 prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
	.eth-header,
	.eth-menu > .eth-menu-item {
		animation: none !important;
	}
}

/* ============================================================
 * 滚动揭示动画（通用，用于 section）
 * 配合 header.js 中的 IntersectionObserver 使用
 * ============================================================ */
/* 滚动揭示：元素进入视口时触发 */
.eth-reveal {
	opacity: 0;
	transform: translateY(30px);
	transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.eth-reveal.eth-reveal--visible {
	opacity: 1;
	transform: translateY(0);
}
.eth-reveal--delay-1 { transition-delay: 0.1s; }
.eth-reveal--delay-2 { transition-delay: 0.2s; }
.eth-reveal--delay-3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
	.eth-reveal {
		opacity: 1;
		transform: none;
		transition: none;
	}
}

/* =========================================================
 * 8. Mega Menu（0.7.6）— 菜单驱动 + Grid 三/四/五列
 * --------------------------------------------------------
 * 用法：在外观→菜单，给「顶级菜单项」添加 CSS 类：
 *   eth-mega       启用 Megamenu（必需）
 *   eth-mega-3     三列 Grid
 *   eth-mega-4     四列 Grid
 *   eth-mega-5     五列 Grid
 *
 * 结构（由 ETH_Menu_Walker 输出）：
 *   li.eth-menu-item--mega
 *     > a.eth-menu-link
 *     > ul.eth-sub-menu.eth-mega-menu   ← 二级 = Grid 面板
 *         > li.eth-menu-item            ← 二级 li = 列
 *             > a（列标题）
 *             > ul.eth-sub-menu--nested  ← 三级 = 列内链接（平铺）
 * ========================================================= */

/* 桌面端：mega 面板全宽 Grid（0.7.8 精修 / 0.8.0 定位修复） */
.eth-menu-item--mega > .eth-sub-menu.eth-mega-menu {
	position: absolute;
	top: 100%;
	left: 0;
	right: 0;
	width: 100%;
	display: grid;
	gap: 0;
	padding: clamp(1.75rem, 3.5vw, 3rem) clamp(1.5rem, 3vw, 2.5rem);
	margin: 0;
	list-style: none;
	background:
		linear-gradient(180deg, color-mix(in srgb, var(--eth-primary) 4%, transparent), transparent 160px),
		var(--eth-bg-surface);
	border: 1px solid var(--eth-premium-border);
	border-radius: 0 0 var(--eth-radius-l) var(--eth-radius-l);
	box-shadow: var(--eth-shadow-xl);
	opacity: 0;
	visibility: hidden;
	transform: translateY(8px);
	transition: opacity var(--eth-transition-m),
		visibility var(--eth-transition-m),
		transform var(--eth-transition-m);
	z-index: var(--eth-z-dropdown);
	/* 0.8.0：未激活面板不接收鼠标事件，激活面板才可交互 */
	pointer-events: none;
}

.eth-menu-item--mega.is-mega-active > .eth-sub-menu.eth-mega-menu {
	pointer-events: auto;
}

/* 顶部品牌色细条 */
.eth-menu-item--mega > .eth-sub-menu.eth-mega-menu::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 3px;
	background: linear-gradient(90deg, var(--eth-primary), var(--eth-tertiary));
}

/* 列数：2-6 列并存 */
.eth-mega-2 > .eth-sub-menu.eth-mega-menu { grid-template-columns: repeat(2, 1fr); }
.eth-mega-3 > .eth-sub-menu.eth-mega-menu { grid-template-columns: repeat(3, 1fr); }
.eth-mega-4 > .eth-sub-menu.eth-mega-menu { grid-template-columns: repeat(4, 1fr); }
.eth-mega-5 > .eth-sub-menu.eth-mega-menu { grid-template-columns: repeat(5, 1fr); }
.eth-mega-6 > .eth-sub-menu.eth-mega-menu { grid-template-columns: repeat(6, 1fr); }

/* 显示/隐藏（0.7.9）：仅 JS 激活 is-mega-active + 键盘 focus-within 兜底。
   移除 :hover 触发，避免相邻 mega 项物理 hover 串菜单。 */
.eth-menu-item--mega.is-mega-active > .eth-sub-menu.eth-mega-menu,
.eth-menu-item--mega:focus-within > .eth-sub-menu.eth-mega-menu {
	opacity: 1;
	visibility: visible;
	transform: translateY(0);
	z-index: var(--eth-z-dropdown);
}

/* 二级 li = 列：列标题在上、三级在下（0.7.9 修复上下布局） */
.eth-mega-menu > .eth-menu-item {
	width: auto;
	padding: 0 clamp(0.75rem, 1.5vw, 1.25rem);
	flex-direction: column;
	align-items: stretch;
}

.eth-mega-menu > .eth-menu-item + .eth-menu-item {
	border-left: 1px solid var(--eth-premium-border);
}

/* 列标题（二级 a）：粗体、大写 eyebrow、品牌色小标 */
.eth-mega-menu > .eth-menu-item > .eth-menu-link {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0 0 0.85rem;
	margin-bottom: 0.85rem;
	font-size: 0.85rem;
	font-weight: 700;
	letter-spacing: 0.07em;
	text-transform: uppercase;
	color: var(--eth-text-title);
	border-bottom: 1px solid var(--eth-premium-border);
	border-radius: 0;
	width: auto;
	white-space: normal;
}

/* 列标题左侧品牌色小标 */
.eth-mega-menu > .eth-menu-item > .eth-menu-link::before {
	content: "";
	flex-shrink: 0;
	width: 0.4rem;
	height: 0.4rem;
	border-radius: 2px;
	background: linear-gradient(135deg, var(--eth-primary), var(--eth-tertiary));
}

/* 列标题 hover：仅文字品牌色 */
.eth-mega-menu > .eth-menu-item > .eth-menu-link:hover {
	color: var(--eth-primary);
	background: transparent;
}

/* 三级 = 列内链接：平铺，精致 hover 箭头 */
.eth-mega-menu > .eth-menu-item > .eth-sub-menu--nested {
	position: static;
	top: auto;
	left: auto;
	transform: none;
	margin-left: 0;
	opacity: 1;
	visibility: visible;
	box-shadow: none;
	border: 0;
	background: transparent;
	padding: 0;
	min-width: 0;
	width: 100%;
}

.eth-mega-menu > .eth-menu-item > .eth-sub-menu--nested .eth-menu-link {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 0.55em 0.55em;
	margin-bottom: 0.15rem;
	width: 100%;
	border-radius: var(--eth-radius-s);
	font-size: 0.9rem;
	font-weight: 500;
	color: var(--eth-text-body);
	transition: color 200ms ease, background-color 200ms ease, padding-left 260ms var(--eth-premium-ease);
}

.eth-mega-menu > .eth-menu-item > .eth-sub-menu--nested .eth-menu-link::after {
	content: "→";
	opacity: 0;
	transform: translateX(-4px);
	transition: opacity 200ms ease, transform 260ms var(--eth-premium-ease);
	color: var(--eth-primary);
	font-size: 0.85em;
}

.eth-mega-menu > .eth-menu-item > .eth-sub-menu--nested .eth-menu-link:hover {
	color: var(--eth-primary);
	background: color-mix(in srgb, var(--eth-primary) 7%, transparent);
	padding-left: 0.75rem;
}

.eth-mega-menu > .eth-menu-item > .eth-sub-menu--nested .eth-menu-link:hover::after {
	opacity: 1;
	transform: translateX(0);
}

/* 三级 li 内部若再嵌套（四级+），mega 内全部静态平铺 */
.eth-mega-menu .eth-sub-menu--nested .eth-sub-menu--nested {
	position: static;
	transform: none;
	box-shadow: none;
	border: 0;
	background: transparent;
	padding-left: var(--eth-space-m);
	opacity: 1;
	visibility: visible;
}

/* mega 面板内隐藏子菜单展开按钮 */
.eth-mega-menu .eth-menu-toggle {
	display: none;
}

/* 移动端：mega 退化为普通展开堆叠 */
@media (max-width: 992px) {
	.eth-menu-item--mega > .eth-sub-menu.eth-mega-menu {
		position: static;
		display: block;
		width: 100%;
		opacity: 1;
		visibility: visible;
		transform: none;
		box-shadow: none;
		border: 0;
		background: transparent;
		padding: var(--eth-space-2xs) 0 var(--eth-space-2xs) var(--eth-space-m);
	}

	.eth-mega-menu > .eth-menu-item > .eth-sub-menu--nested {
		display: none;
	}
	.eth-mega-menu > .eth-menu-item.is-expanded > .eth-sub-menu--nested {
		display: block;
	}
}