/* 时尚高级导航栏样式 */
.navbar-fixed-top {
    transition: all 0.4s ease;
}

/* 首页透明背景 */
.transparent-bg {
    background: transparent !important;
    box-shadow: none !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
}

/* 其他页面白色背景 */
.solid-bg {
    background: white !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1) !important;
}

/* 滚动后样式 - 白色背景 */
.navbar-fixed-top.scrolled {
    background: white !important;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1) !important;
    border-bottom: none !important;
}

/* 导航栏基础样式 */
.met-nav {
    padding: 0;
    margin: 0;
    height: 70px;
    min-height: 70px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 0 20px;
}

/* 品牌标志样式 */
.navbar-brand {
    height: 70px;
    padding: 0;
    margin-right: 30px;
    display: flex;
    align-items: center;
}

.navbar-brand img {
    max-height: 40px;
    max-width: 180px;
    transition: all 0.3s ease;
}

.comnamet {
    font-size: 24px;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.5px;
}

.transparent-bg .comnamet {
    color: #ffffff;
}

.solid-bg .comnamet, .scrolled .comnamet {
    color: #333333;
    background: linear-gradient(135deg, #0077ff 0%, #00c6ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* 汉堡菜单按钮 */
.navbar-toggle {
    margin-top: 18px;
    border: none;
    background: transparent !important;
}

.hamburger {
    position: relative;
    display: block;
    width: 44px;
    height: 44px;
    cursor: pointer;
    transition: transform 0.4s ease;
}

.hamburger-bar {
    position: absolute;
    top: 50%;
    left: 10px;
    right: 10px;
    height: 2px;
    background: #ffffff;
    transition: transform 0.4s ease, opacity 0.4s ease;
}

.hamburger-bar:before,
.hamburger-bar:after {
    content: '';
    position: absolute;
    left: 0;
    height: 2px;
    width: 100%;
    background: #ffffff;
    transition: transform 0.4s ease;
}

.hamburger-bar:before {
    top: -8px;
}

.hamburger-bar:after {
    bottom: -8px;
}

.solid-bg .hamburger-bar,
.solid-bg .hamburger-bar:before,
.solid-bg .hamburger-bar:after,
.scrolled .hamburger-bar,
.scrolled .hamburger-bar:before,
.scrolled .hamburger-bar:after {
    background: #333333;
}

/* 导航菜单项 */
.navlist {
    display: flex;
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
    margin: 0 8px;
}

.nav-item > a {
    display: flex;
    align-items: center;
    position: relative;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    text-decoration: none;
    height: 70px;
}

.transparent-bg .nav-item > a {
    color: rgba(255, 255, 255, 0.9);
}

.solid-bg .nav-item > a,
.scrolled .nav-item > a {
    color: #333333;
}

/* 活动菜单项样式 */
.active {
    color: #00c6ff !important;
}

.active:after {
    content: '';
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: #00c6ff;
    border-radius: 1px;
}

/* 下拉菜单样式 */
.subnav {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: white;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.nav-item:hover .subnav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.subnav li {
    list-style: none;
    margin: 0;
}

.subnav a {
    display: block;
    padding: 10px 20px;
    color: #555555;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s ease;
}

.subnav a:hover {
    background: #f8f9fa;
    color: #0077ff;
    padding-left: 25px;
}

/* 响应式设计 */
@media (max-width: 991px) {
    .navbar-collapse {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        z-index: 999;
    }
    
    .navbar-collapse.in {
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }
    
    .navlist {
        flex-direction: column;
        align-items: flex-start;
        padding: 15px 0;
    }
    
    .nav-item {
        width: 100%;
        margin: 0;
    }
    
    .nav-item > a {
        height: auto;
        padding: 12px 25px;
    }
    
    .subnav {
        position: static;
        width: 100%;
        box-shadow: none;
        border-radius: 0;
        opacity: 1;
        visibility: visible;
        transform: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .nav-item:hover .subnav {
        max-height: 500px;
    }
    
    .transparent-bg .navbar-collapse {
        background: rgba(255, 255, 255, 0.95);
    }
    
    .transparent-bg .nav-item > a {
        color: #333333;
    }
    
    .active:after {
        display: none;
    }
}

/* 添加滚动监听脚本 */
<script>
document.addEventListener('DOMContentLoaded', function() {
    const navbar = document.querySelector('.navbar-fixed-top');
    
    // 滚动事件监听
    window.addEventListener('scroll', function() {
        if (window.scrollY > 50) {
            navbar.classList.add('scrolled');
        } else {
            navbar.classList.remove('scrolled');
        }
    });
    
    // 移动端菜单切换
    const toggleBtn = document.querySelector('.navbar-toggle');
    const navbarCollapse = document.querySelector('.navbar-collapse');
    
    if (toggleBtn) {
        toggleBtn.addEventListener('click', function() {
            this.classList.toggle('collapsed');
            navbarCollapse.classList.toggle('in');
        });
    }
});
</script>