/* 
 * 环亚实验室 - 增强导航栏样式
 * Enhanced Navbar Styles for HY-LAB
 */

/* ========================================
   导航栏容器优化
   ======================================== */
.head_nav_met_16_5_6 {
    position: relative;
    z-index: 1000;
}

/* 导航栏顶部区域 - 现代扁平设计 */
.head_nav_met_16_5_6 .nav-top {
    background: #ffffff !important;
    box-shadow: 0 2px 8px rgba(0,102,204,0.08) !important;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0,102,204,0.1);
}

/* 滚动时增强阴影 */
.met-head.navbar-fixed-top {
    box-shadow: 0 4px 16px rgba(0,102,204,0.12) !important;
    background: rgba(255,255,255,0.98) !important;
    backdrop-filter: blur(10px);
}

/* Logo区域优化 */
.head_nav_met_16_5_6 .met-logo {
    transition: transform 0.3s ease;
}

.head_nav_met_16_5_6 .met-logo:hover {
    transform: scale(1.05);
}

.head_nav_met_16_5_6 .met-logo img {
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

/* ========================================
   导航菜单优化
   ======================================== */
/* 导航容器 */
.head_nav_met_16_5_6 .fullnav {
    background: transparent !important;
}

.head_nav_met_16_5_6 .fullnav .container,
.head_nav_met_16_5_6 .fullnav .row {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin: 0;
    padding: 0;
}

.head_nav_met_16_5_6 .nav.navbar-nav {
    float: none !important;
}

.head_nav_met_16_5_6 .navlist {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    margin: 0;
    padding: 18px 0;
}

.head_nav_met_16_5_6 .navlist > li {
    float: none !important;
    display: flex;
    align-items: center;
}

.head_nav_met_16_5_6 .navlist .nav-item {
    display: flex;
    align-items: center;
    position: relative;
}

/* 确保下拉菜单的父元素有正确的定位上下文 */
.head_nav_met_16_5_6 .nav-item.dropdown {
    position: relative !important;
}

/* 导航链接 - 现代胶囊设计 */
.head_nav_met_16_5_6 .navlist .nav-item a.nav-link {
    color: #333333 !important;
    font-weight: 600 !important;
    font-size: 15px;
    padding: 12px 22px !important;
    border-radius: 25px;
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    overflow: visible;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 移除默认的下划线效果 */
.head_nav_met_16_5_6 .navlist .nav-item a.nav-link::after {
    display: none !important;
}

/* 悬停效果 - 渐变背景 */
.head_nav_met_16_5_6 .navlist .nav-item:hover a.nav-link {
    color: #ffffff !important;
    background: linear-gradient(135deg, #0066CC 0%, #0052A3 100%) !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,102,204,0.3);
}

/* 当前激活项 - 蓝色实心胶囊 */
.head_nav_met_16_5_6 .navlist .nav-item a.nav-link.active,
.head_nav_met_16_5_6 .navlist .nav-item.open a.nav-link {
    color: #ffffff !important;
    background: linear-gradient(135deg, #0066CC 0%, #004C99 100%) !important;
    box-shadow: 0 2px 8px rgba(0,102,204,0.25);
}

/* 点击效果 */
.head_nav_met_16_5_6 .navlist .nav-item a.nav-link:active {
    transform: translateY(0px);
}

/* ========================================
   下拉菜单优化
   ======================================== */
.head_nav_met_16_5_6 .dropdown-menu {
    background: #ffffff !important;
    border: none !important;
    border-radius: 18px !important;
    box-shadow: 0 18px 40px rgba(15, 76, 129, 0.18), 0 0 0 1px rgba(0, 102, 204, 0.06) !important;
    padding: 14px 12px !important;
    margin-top: 0 !important;
    padding-top: 20px !important; /* 用 padding-top 替代 margin-top，消除间隙 */
    min-width: 220px !important;
    overflow: hidden;
    backdrop-filter: blur(6px);
    position: absolute !important;
    top: 100% !important;
    left: 0 !important;
    right: auto !important;
    transform: none !important;
}

/* 添加虚拟连接桥，消除一级菜单和下拉菜单之间的间隙 */
.head_nav_met_16_5_6 .nav-item.dropdown > .dropdown-menu::before {
    content: '';
    position: absolute;
    top: -12px; /* 覆盖到一级菜单上方12px，填补间隙 */
    left: 0;
    right: 0;
    height: 12px;
    background: transparent;
    pointer-events: auto;
    z-index: -1;
}

/* 确保下拉菜单在悬停状态下保持显示 */
.head_nav_met_16_5_6 .nav-item.dropdown:hover > .dropdown-menu,
.head_nav_met_16_5_6 .nav-item.dropdown.open > .dropdown-menu,
.head_nav_met_16_5_6 .nav-item.dropdown.show > .dropdown-menu,
.head_nav_met_16_5_6 .dropdown-menu:hover {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
}

/* 下拉菜单箭头 */
.head_nav_met_16_5_6 .dropdown-menu.dropdown-menu-bullet:before,
.head_nav_met_16_5_6 .dropdown-menu.dropdown-menu-bullet:after {
    border-bottom-color: #ffffff !important;
}

/* 下拉菜单项 - 默认蓝色文字，无背景 */
.head_nav_met_16_5_6 .dropdown-item,
.head_nav_met_16_5_6 .dropdown-menu a {
    color: #0066CC !important;
    padding: 12px 18px !important;
    border-radius: 999px !important;
    margin: 4px 2px !important;
    transition: all 0.3s ease;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    font-weight: 500;
    position: relative;
    overflow: visible;
    letter-spacing: 0.2px;
    background: transparent !important;
    border: none !important;
    text-decoration: none !important;
}

.head_nav_met_16_5_6 .dropdown-item span,
.head_nav_met_16_5_6 .dropdown-item i,
.head_nav_met_16_5_6 .dropdown-item em,
.head_nav_met_16_5_6 .dropdown-menu a span,
.head_nav_met_16_5_6 .dropdown-menu a i,
.head_nav_met_16_5_6 .dropdown-menu a em {
    color: #0066CC !important;
}

/* 悬停效果 - 白色文字，蓝色椭圆背景 */
.head_nav_met_16_5_6 .dropdown-item:hover,
.head_nav_met_16_5_6 .dropdown-menu a:hover,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item:hover,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a:hover {
    color: #ffffff !important;
    background: linear-gradient(135deg, #0066CC 0%, #004C99 100%) !important;
    background-color: #0066CC !important;
    background-image: none !important;
    font-weight: 600 !important;
    transform: translateX(6px);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3) !important;
}

.head_nav_met_16_5_6 .dropdown-item:hover span,
.head_nav_met_16_5_6 .dropdown-item:hover i,
.head_nav_met_16_5_6 .dropdown-item:hover em,
.head_nav_met_16_5_6 .dropdown-menu a:hover span,
.head_nav_met_16_5_6 .dropdown-menu a:hover i,
.head_nav_met_16_5_6 .dropdown-menu a:hover em,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item:hover span,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a:hover span {
    color: #ffffff !important;
    background: transparent !important;
    background-color: transparent !important;
}

/* 点击状态 - 仅点击瞬间，轻微效果 */
.head_nav_met_16_5_6 .dropdown-item:active:not(.active),
.head_nav_met_16_5_6 .dropdown-menu a:active:not(.active) {
    background: rgba(0, 102, 204, 0.05) !important;
    color: #0066CC !important;
}

/* 二级菜单（三级菜单 - 向右展开是正确的） */
.head_nav_met_16_5_6 .dropdown-submenu .dropdown-menu {
    left: 100% !important;
    top: 0 !important;
    margin-left: 8px;
}

/* 确保一级下拉菜单（二级菜单）垂直向下展开，不是水平向右 */
.head_nav_met_16_5_6 .nav-item.dropdown > .dropdown-menu,
.head_nav_met_16_5_6 .nav-item.dropdown > .dropdown-menu.two-menu,
.head_nav_met_16_5_6 .navlist .nav-item.dropdown > .dropdown-menu,
.head_nav_met_16_5_6 .navlist .nav-item.dropdown > .dropdown-menu.two-menu {
    left: 0 !important;
    right: auto !important;
    top: 100% !important;
    bottom: auto !important;
    transform: none !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
    position: absolute !important;
}

/* ========================================
   联系信息区域优化
   ======================================== */
.head_nav_met_16_5_6 .eco_header .top-info {
    padding: 0 15px;
}

.head_nav_met_16_5_6 .eco_header .top-info .icon-box span {
    color: #0066CC !important;
    font-size: 28px;
    transition: transform 0.3s ease;
}

.head_nav_met_16_5_6 .eco_header .top-info:hover .icon-box span {
    transform: scale(1.1);
}

.head_nav_met_16_5_6 .eco_header .top-info .content-box p {
    color: #666666 !important;
    font-size: 14px;
}

.head_nav_met_16_5_6 .eco_header .top-info .content-box p span {
    color: #333333 !important;
    font-weight: 600;
}

.head_nav_met_16_5_6 .eco_header .top-info .content-box p a {
    color: #0066CC !important;
    transition: color 0.3s ease;
}

.head_nav_met_16_5_6 .eco_header .top-info .content-box p a:hover {
    color: #00C853 !important;
}

/* 分隔线优化 */
.head_nav_met_16_5_6 .eco_header .top-info + .top-info .icon-box:before {
    background: linear-gradient(180deg, transparent 0%, rgba(0,102,204,0.2) 50%, transparent 100%) !important;
    width: 2px !important;
}

/* ========================================
   移动端汉堡菜单优化
   ======================================== */
.head_nav_met_16_5_6 .navbar-toggler {
    border: none;
    background: linear-gradient(135deg, #0066CC 0%, #004C99 100%);
    border-radius: 8px;
    padding: 8px 12px;
    transition: all 0.3s ease;
}

.head_nav_met_16_5_6 .navbar-toggler:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,102,204,0.3);
}

.head_nav_met_16_5_6.navbar-default .hamburger .hamburger-bar,
.head_nav_met_16_5_6.navbar-default .hamburger:after,
.head_nav_met_16_5_6.navbar-default .hamburger:before {
    background-color: #ffffff !important;
}

/* ========================================
   语言切换按钮优化
   ======================================== */
.head_nav_met_16_5_6 .met-langlist .btn-outline.btn-default {
    color: #0066CC !important;
    border: 2px solid #0066CC !important;
    border-radius: 20px;
    padding: 6px 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    background: transparent;
}

.head_nav_met_16_5_6 .met-langlist .btn-outline.btn-default:hover {
    background: #0066CC !important;
    color: #ffffff !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,102,204,0.3);
}

/* ========================================
   用户中心按钮优化
   ======================================== */
.head_nav_met_16_5_6 .met-head-user li a.btn-outline {
    border: 2px solid #0066CC !important;
    color: #0066CC !important;
    border-radius: 25px;
    padding: 8px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.head_nav_met_16_5_6 .met-head-user li a.btn-outline:hover {
    background: #0066CC !important;
    color: #ffffff !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,102,204,0.3);
}

.head_nav_met_16_5_6 .met-head-user li a.btn-success {
    background: linear-gradient(135deg, #00C853 0%, #00A043 100%) !important;
    border: none !important;
    border-radius: 25px;
    padding: 8px 20px;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(0,200,83,0.3);
    transition: all 0.3s ease;
}

.head_nav_met_16_5_6 .met-head-user li a.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,200,83,0.4);
}

/* ========================================
   搜索框优化（如果有）
   ======================================== */
.head_nav_met_16_5_6 .search-box {
    position: relative;
}

.head_nav_met_16_5_6 .search-box input {
    border: 2px solid #E8EBF0;
    border-radius: 25px;
    padding: 8px 40px 8px 20px;
    transition: all 0.3s ease;
}

.head_nav_met_16_5_6 .search-box input:focus {
    border-color: #0066CC;
    box-shadow: 0 0 0 3px rgba(0,102,204,0.1);
    outline: none;
}

.head_nav_met_16_5_6 .search-box button {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: linear-gradient(135deg, #0066CC 0%, #004C99 100%);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    color: #ffffff;
    transition: all 0.3s ease;
}

.head_nav_met_16_5_6 .search-box button:hover {
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 2px 8px rgba(0,102,204,0.3);
}

/* ========================================
   响应式优化
   ======================================== */
@media (max-width: 991px) {
    /* 移动端菜单背景 */
    .head_nav_met_16_5_6 .navbar-collapse {
        background: #ffffff;
        border-radius: 12px;
        margin-top: 10px;
        padding: 15px;
        box-shadow: 0 4px 16px rgba(0,102,204,0.15);
    }
    
    /* 移动端菜单项 */
    .head_nav_met_16_5_6 .navlist .nav-item {
        margin: 5px 0 !important;
    }
    
    .head_nav_met_16_5_6 .navlist .nav-item a.nav-link {
        text-align: left;
        padding: 12px 20px !important;
    }
    
    /* 移动端下拉菜单 */
    .head_nav_met_16_5_6 .dropdown-menu {
        background: #F5F7FA !important;
        box-shadow: none !important;
        margin-top: 8px !important;
        padding: 8px 0 !important;
    }
}

@media (max-width: 767px) {
    .head_nav_met_16_5_6 .nav-top {
        height: auto !important;
        min-height: 60px;
        line-height: normal;
        padding: 10px 0;
    }
    
    .head_nav_met_16_5_6 .eco_header {
        display: none !important;
    }
}

/* ========================================
   动画效果
   ======================================== */
@keyframes navSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.head_nav_met_16_5_6 .navlist .nav-item {
    animation: navSlideIn 0.3s ease-out backwards;
}

.head_nav_met_16_5_6 .navlist .nav-item:nth-child(1) { animation-delay: 0.05s; }
.head_nav_met_16_5_6 .navlist .nav-item:nth-child(2) { animation-delay: 0.1s; }
.head_nav_met_16_5_6 .navlist .nav-item:nth-child(3) { animation-delay: 0.15s; }
.head_nav_met_16_5_6 .navlist .nav-item:nth-child(4) { animation-delay: 0.2s; }
.head_nav_met_16_5_6 .navlist .nav-item:nth-child(5) { animation-delay: 0.25s; }
.head_nav_met_16_5_6 .navlist .nav-item:nth-child(6) { animation-delay: 0.3s; }

/* ========================================
   下拉菜单显示优化
   ======================================== */
/* 下拉菜单展开动画 */
@keyframes dropdownFade {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 确保下拉菜单立即显示 */
.head_nav_met_16_5_6 .dropdown.open > .dropdown-menu,
.head_nav_met_16_5_6 .dropdown.show > .dropdown-menu,
.head_nav_met_16_5_6 .nav-item.dropdown.open > .dropdown-menu,
.head_nav_met_16_5_6 .nav-item.dropdown.show > .dropdown-menu,
.head_nav_met_16_5_6 .nav-item.dropdown:hover > .dropdown-menu,
.head_nav_met_16_5_6 .nav-item.dropdown:hover > .dropdown-menu.two-menu {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
    animation: dropdownFade 0.2s ease-out;
}

/* 确保下拉菜单项容器可见并可以接收鼠标事件 */
.head_nav_met_16_5_6 .dropdown-menu.two-menu {
    pointer-events: auto !important;
}

/* 确保下拉菜单及其虚拟桥都可以接收鼠标事件，保持菜单显示 */
.head_nav_met_16_5_6 .nav-item.dropdown > .dropdown-menu,
.head_nav_met_16_5_6 .nav-item.dropdown > .dropdown-menu::before {
    pointer-events: auto !important;
}

/* 选中状态 - 只有真正选中的项才显示蓝色背景和白色文字 */
.head_nav_met_16_5_6 .dropdown-item.active,
.head_nav_met_16_5_6 .dropdown-menu a.active,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a.active,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item.active,
.head_nav_met_16_5_6 .nav-item.dropdown .dropdown-menu a.active,
.head_nav_met_16_5_6 .nav-item.dropdown .dropdown-menu .dropdown-item.active {
    background: linear-gradient(135deg, #0066CC 0%, #004C99 100%) !important;
    background-color: #0066CC !important;
    color: #ffffff !important;
    font-weight: 600 !important;
    box-shadow: 0 12px 28px rgba(0, 123, 255, 0.25);
}

/* 确保选中项的所有子元素都是白色文字 */
.head_nav_met_16_5_6 .dropdown-item.active span,
.head_nav_met_16_5_6 .dropdown-item.active i,
.head_nav_met_16_5_6 .dropdown-item.active em,
.head_nav_met_16_5_6 .dropdown-item.active *,
.head_nav_met_16_5_6 .dropdown-menu a.active span,
.head_nav_met_16_5_6 .dropdown-menu a.active i,
.head_nav_met_16_5_6 .dropdown-menu a.active em,
.head_nav_met_16_5_6 .dropdown-menu a.active *,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a.active span,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item.active span,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a.active *,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item.active *,
.head_nav_met_16_5_6 .nav-item.dropdown .dropdown-menu a.active span,
.head_nav_met_16_5_6 .nav-item.dropdown .dropdown-menu .dropdown-item.active span,
.head_nav_met_16_5_6 .nav-item.dropdown .dropdown-menu a.active *,
.head_nav_met_16_5_6 .nav-item.dropdown .dropdown-menu .dropdown-item.active * {
    color: #ffffff !important;
    background: transparent !important;
    background-color: transparent !important;
}

/* 覆盖原生CSS - 确保默认状态为蓝色文字，悬停为白色文字+蓝色背景 */
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item {
    color: #0066CC !important;
    background: transparent !important;
}

.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a span,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item span {
    color: #0066CC !important;
    background: transparent !important;
}

/* 覆盖原生CSS的悬停背景色，强制显示蓝色 - 使用更具体的选择器提高优先级 */
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a:hover,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item:hover,
.head_nav_met_16_5_6 .navlist .nav-item.dropdown .dropdown-menu a:hover,
.head_nav_met_16_5_6 .navlist .nav-item.dropdown .dropdown-menu .dropdown-item:hover,
.head_nav_met_16_5_6 .dropdown-menu.two-menu a:hover,
.head_nav_met_16_5_6 .dropdown-menu.two-menu .dropdown-item:hover {
    background: linear-gradient(135deg, #0066CC 0%, #004C99 100%) !important;
    background-color: #0066CC !important;
    background-image: none !important;
    color: #ffffff !important;
}

.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a:hover span,
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item:hover span,
.head_nav_met_16_5_6 .navlist .nav-item.dropdown .dropdown-menu a:hover span,
.head_nav_met_16_5_6 .navlist .nav-item.dropdown .dropdown-menu .dropdown-item:hover span {
    background: transparent !important;
    background-color: transparent !important;
    background-image: none !important;
    color: #ffffff !important;
}

/* 确保未选中项默认蓝色文字，无背景 */
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu a:not(.active),
.head_nav_met_16_5_6 .navlist .nav-item .dropdown-menu .dropdown-item:not(.active) {
    background: transparent !important;
    color: #0066CC !important;
}

/* ========================================
   特殊效果 - 导航栏呼吸灯（可选）
   ======================================== */
.head_nav_met_16_5_6 .navlist .nav-item a.nav-link.active::before {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: #00C853;
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(0,200,83,0.7);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(0,200,83,0);
    }
}

/* ========================================
   高级效果 - 导航栏磨砂玻璃效果
   ======================================== */
.met-head.navbar-fixed-top .head_nav_met_16_5_6 .nav-top {
    background: rgba(255,255,255,0.85) !important;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
}

/* ========================================
   可访问性增强
   ======================================== */
.head_nav_met_16_5_6 .navlist .nav-item a.nav-link:focus {
    outline: 2px solid #0066CC;
    outline-offset: 4px;
}

.head_nav_met_16_5_6 .dropdown-item:focus {
    outline: 2px solid #0066CC;
    outline-offset: 2px;
}

/* ========================================
   打印样式
   ======================================== */
@media print {
    .head_nav_met_16_5_6 {
        display: none;
    }
}