transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
z-index: 200;
}
.dv-main-nav>ul>li:hover .dv-submenu {
opacity: 1;
visibility: visible;
transform: translateX(-50%) translateY(4px);
}
/* 二级菜单项 */
.dv-main-nav .dv-submenu .dv-sub-li {
position: relative;
margin: 0;
padding: 0;
list-style: none;
}
.dv-main-nav .dv-submenu .dv-sub-li a {
display: flex;
justify-content: center;
align-items: center;
padding: 0.57rem 1.8rem;
text-decoration: none;
color: #444444 !important;
font-size: 0.87rem;
font-weight: 500;
white-space: nowrap;
transition: background 0.15s, color 0.15s;
}
.dv-main-nav .dv-submenu .dv-sub-li a:hover {
background: #f5f5f5;
color: #000000 !important;
}
/* 有三级菜单的二级项箭头（桌面端） */
.dv-main-nav .dv-submenu .dv-sub-li.has-third>a {
position: relative; /* 为箭头绝对定位提供参考 */
padding-right: 1.8rem; /* 为箭头预留空间，防止文字与箭头重叠 */
}
.dv-main-nav .dv-submenu .dv-sub-li.has-third>a::after {
content: "▸";
position: absolute;
right: 0.8rem; /* 距离右侧边缘 */
top: 50%;
transform: translateY(-50%);
font-size: 0.67rem;
color: #999;
transition: color 0.2s, transform 0.2s;
line-height: 1;
/* 移除 margin-left，不再影响文字布局 */
}
.dv-main-nav .dv-submenu .dv-sub-li.has-third>a:hover::after {
transform: translateY(-50%) translateX(3px); /* 水平移动，保持垂直居中 */
color: #333;
}
/* ============================================================
★★★ 三级菜单（桌面端向右展开） ★★★
============================================================ */
.dv-third-menu {
position: absolute;
top: -0.3rem;
left: calc(100% + 4px);
min-width: 246px;
background: #ffffff;
list-style: none;
padding: 0.4rem 0;
margin: 0;
border: 1px solid rgba(0, 0, 0, 0.08);
border-radius: 6px;
box-shadow: 0 6px 14px rgba(0, 0, 0, 0.07);
opacity: 0;
visibility: hidden;
transform: translateX(-6px);
transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
z-index: 272;
}
.dv-main-nav .dv-submenu .dv-sub-li:hover .dv-third-menu {
opacity: 1;
visibility: visible;
transform: translateX(0);
}
.dv-third-menu li {
margin: 0;
padding: 0;
list-style: none;
}
.dv-third-menu li a {
display: flex;
justify-content: center;
align-items: center;
padding: 0.52rem 1.4rem;
text-decoration: none;
color: #555555 !important;
font-size: 0.82rem;
font-weight: 400;
white-space: nowrap;
transition: background 0.15s, color 0.15s;
}
.dv-third-menu li a:hover {
background: #f2f7eb;
color: #1d1d1d !important;
}
/* 空菜单自动隐藏（CSS 兜底） */
.dv-third-menu:empty,
.dv-submenu:empty {
display: none !important;
}
/* ============================================================
语言切换
============================================================ */
.dv-lang-switch {
flex-shrink: 0;
display: flex;
align-items: center;
}
.dv-lang-switch a {
text-decoration: none;
font-size: 0.85rem;
color: #555555;
padding: 0.42rem 0.8rem;
border: 1px solid #cccccc;
border-radius: 4px;
transition: all 0.2s;
}
.dv-lang-switch a:hover {
color: #000000;
border-color: #888888;
background: #f9f9f9;
}
/* ============================================================
汉堡按钮
============================================================ */
.dv-hamburger {
display: none;
flex-direction: column;
gap: 5px;
cursor: pointer;
padding: 0.5rem;
background: none;
border: none;
z-index: 362;
}
.dv-hamburger span {
display: block;
width: 27px;
height: 2px;
background: #333333;
border-radius: 2px;
transition: all 0.3s ease;
}
.dv-hamburger.active span:nth-child(1) {
transform: rotate(45deg) translate(5px, 5px);
}
.dv-hamburger.active span:nth-child(2) {
opacity: 0;
}
.dv-hamburger.active span:nth-child(3) {
transform: rotate(-45deg) translate(5px, -5px);
}
/* ============================================================
响应式 — 移动端 ≤ 768px
============================================================ */
@media (max-width: 768px) {
.dv-top-bar {
padding: 0 1rem;
min-height: 56px;
flex-wrap: wrap;
}
.dv-logo-container {
padding-right: 0;
}
.dv-logo-container img {
max-height: 36px !important;
}
.dv-hamburger {
display: flex;
}
.dv-top-bar>.dv-lang-switch {
display: none;
}
.dv-right-area {
display: none;
order: 3;
width: 100%;
flex: none;
flex-direction: column;
align-items: stretch;
gap: 0;
padding: 0;
background: #ffffff;
border-top: 1px solid rgba(0, 0, 0, 0.08);
max-height: 0;
overflow: hidden;
transition: max-height 0.39s ease;
text-align: center;
}
.dv-right-area.open {
display: flex;
max-height: 3020px;
overflow-y: auto;
}
.dv-main-nav {
flex: none;
justify-content: flex-start;
width: 100%;
}
.dv-main-nav>ul {
flex-direction: column;
gap: 0;
width: 100%;
}
.dv-main-nav>ul>li {
border-bottom: 1px solid #f0f0f0;
width: 100%;
position: relative;
}
.dv-main-nav>ul>li>a {
padding: 0.9rem 1rem;
font-size: 1rem;
text-align: center;
}
.dv-main-nav>ul>li>a::after {
display: none;
}
/* 一级菜单箭头（由 JS 动态添加，仅移动端） */
.dv-main-nav>ul>li>a .dropdown-arrow {
margin-left: 8px;
font-size: 0.85em;
opacity: 0.7;
transition: transform 0.3s;
}
.dv-main-nav>ul>li.sub-open>a .dropdown-arrow {
transform: rotate(180deg);
}
/* ---------- 移动端：二级菜单容器居中 + 占位 ---------- */
.dv-main-nav .dv-submenu {
position: relative !important; /* 占位：不脱离文档流 */
top: auto !important;
left: auto !important;
transform: none !important;
margin: 0 !important;
opacity: 1;
visibility: visible;
box-shadow: none;
border: none;
border-radius: 0;
background: #fafafa;
min-width: auto;
padding: 0;
max-height: 0;
overflow: hidden;
transition: max-height 0.37s ease;
display: flex;
flex-direction: column;
align-items: center;
width: 100% !important;
z-index: 1;
}
.dv-main-nav>ul>li.sub-open .dv-submenu {
max-height: 3220px;
}
.dv-main-nav .dv-submenu .dv-sub-li {
width: 100%;
text-align: center;
}
.dv-main-nav .dv-submenu .dv-sub-li a {
padding: 0.67rem 1.8rem;
font-size: 0.92rem;
text-align: center;
justify-content: center;
display: block;
width: auto;
}
.dv-main-nav .dv-submenu .dv-sub-li {
position: static;
}
/* 二级菜单项箭头（由 JS 动态添加，仅移动端） */
.dv-main-nav .dv-submenu .dv-sub-li a .dropdown-arrow {
margin-left: 8px;
font-size: 0.75em;
opacity: 0.7;
transition: transform 0.3s;
}
.dv-main-nav .dv-submenu .dv-sub-li.third-open>a .dropdown-arrow {
transform: rotate(180deg);
}
/* ★★★ 移动端：三级菜单容器居中 ★★★ */
.dv-third-menu {
position: static;
transform: none;
opacity: 1;
visibility: visible;
box-shadow: none;
border: none;
border-radius: 0;
background: #f2f2f2;
min-width: auto;
padding: 0;
margin-left: auto;
margin-right: auto;
width: 85%;
max-width: 378px;
max-height: 0;
overflow: hidden;
transition: max-height 0.34s ease;
border-left: 2px solid #cde0b6;
}
.dv-main-nav .dv-submenu .dv-sub-li.third-open .dv-third-menu {
max-height: 2120px;
}
.dv-third-menu li a {
padding: 0.48rem 1.2rem;
font-size: 0.85rem;
color: #444 !important;
text-align: center;
justify-content: center;
}
.dv-third-menu li a:hover {
background: #e6efdb;
}
.dv-right-area .dv-lang-switch {
margin: 0;
padding: 1rem;
border-top: 1px solid #f0f0f0;
display: flex;
justify-content: center;
}
.dv-right-area .dv-lang-switch a {
display: inline-block;
text-align: center;
width: auto;
padding: 0.42rem 1.3rem;
}
.dv-mobile-overlay {
display: none !important;
}
}
.dv-top-bar+* {
margin-top: 0 !important;
}