/* 导航栏基础样式 */
.navbar {
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1050;
    background: rgba(0, 153, 255, 0.2);
    height: 70px;
    backdrop-filter: blur(5px);
    border: none;
    list-style: none;
    text-decoration: none;
}

.navbar.fixed {
    background: rgba(0, 27, 51, 0.9);
}

.navbar.transparent {
    background: transparent;
}
/* 修改容器样式 */
.navbar .container {
    display: flex;
    justify-content: flex-start; /* 改为左对齐 */
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
    height: 100%; /* 确保容器高度100% */
}
/* 修改导航列表样式 */
.navbar-nav {
    display: flex;
    align-items: center;
    margin: 0;
    padding: 0;
    list-style: none;
    flex-wrap: nowrap; /* 防止换行 */
    margin-left: 20px; /* 添加左边距 */
}


/* 修改导航项样式 */
.nav-item {
    position: relative;
    padding: 0;
    margin: 0 10px; /* 减小边距 */
    white-space: nowrap; /* 防止文字换行 */
    list-style: none;
    list-style-type: none;
}

.nav-link {
    color: #fff;
    font-size: 14px; /* 减小字体大小 */
    font-weight: 500;
    padding: 25px 10px; /* 调整内边距 */
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
    display: block;
    text-decoration: none;
    padding: 0.5rem 1rem;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #fff;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link:hover {
    color: rgba(255, 255, 255, 0.8);
}

.slider-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: background 0.3s ease;
}

.slider-nav:hover {
    background: rgba(255, 255, 255, 0.4);
}

/* 下拉菜单样式修改 */
.mega-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 200px;
    background: rgba(0, 27, 51, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    border-radius: 4px;
    z-index: 1031;
    padding: 10px 0;
}

.mega-dropdown-content {
    padding: 10px;
}

.dropdown-section {
    white-space: nowrap;
    padding: 5px 15px;
}

.dropdown-section h3 {
    color: #fff;
    font-size: 14px;
    margin-bottom: 8px;
    padding-bottom: 5px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.dropdown-section a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
    padding: 5px 0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.dropdown-section a:hover {
    color: #fff;
}

/* 重要：悬停时显示下拉菜单 */
.nav-item:hover .mega-dropdown {
    display: block;
    animation: fadeIn 0.3s ease forwards;
}

/* 添加动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* 移动端下拉菜单样式 */
@media (max-width: 768px) {
    .mega-dropdown {
        position: static;
        transform: none;
        width: 100%;
        margin-top: 0;
        box-shadow: none;
    }
    
    .nav-item:hover .mega-dropdown {
        animation: none;
    }
}

/* 响应式调整 - 平板电脑 */
@media (max-width: 992px) {
    .nav-link {
        font-size: 13px;
        padding: 25px 8px;
    }
    
    .nav-item {
        margin: 0 5px;
    }
}

/* 响应式调整 - 移动端 */
@media (max-width: 768px) {
    /* 导航栏基础样式 */
    .navbar {
        height: 60px;
    }
    
    .navbar .container {
        justify-content: space-between;
    }

    /* Logo大小调整 */
    .navbar-brand img {
        height: 30px;
    }
    
    /* 导航菜单折叠样式 */
    .navbar-collapse {
        position: fixed; /* 改为固定定位 */
        top: 60px; /* 导航栏高度 */
        left: 0;
        right: 0;
        bottom: 0; /* 延伸到底部 */
        background: rgba(0, 27, 51, 0.95);
        backdrop-filter: blur(10px);
        padding: 20px;
        display: none;
        overflow-y: auto; /* 内容过多时可滚动 */
    }
    
    /* 导航菜单显示时的样式 */
    .navbar-collapse.show {
        display: block;
    }
    
    /* 导航项样式 */
    .navbar-nav {
        flex-direction: column;
        width: 100%;
    }
    
    .nav-item {
        margin: 10px 0;
        text-align: center;
        width: 100%;
    }
    
    .nav-link {
        padding: 15px 0;
        font-size: 16px;
        color: #fff;
    }
    
    /* 下拉菜单样式 */
    .mega-dropdown {
        position: static;
        width: 100%;
        background: transparent;
        box-shadow: none;
        padding: 10px 0;
        margin: 0;
        display: none;
    }
    
    .nav-item:hover .mega-dropdown {
        display: block;
    }
    
    .dropdown-section {
        padding: 5px 0;
    }
    
    .dropdown-section h3 {
        color: rgba(255, 255, 255, 0.7);
        font-size: 14px;
        margin: 10px 0;
    }
    
    .dropdown-section a {
        color: #fff;
        padding: 8px 0;
        font-size: 14px;
        text-align: center;
        display: block;
    }
}

/* 桌面端导航样式 */
@media (min-width: 768px) {
    .navbar-collapse {
        flex-grow: 0;
        display: flex !important;
    }

    .navbar-nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-item {
        margin: 0.5rem 1rem;
    }
}

/* Logo样式调整 */
.navbar-brand {
    padding: 10px 0;
    margin-right: 20px;
    display: flex;
    align-items: center;
    text-decoration: none;
    display: block;
    align-items: center;
    text-decoration: none;
    padding: 0;
    margin: 0;
    list-style: none;
    list-style-type: none;
    margin-left: 40px;
}

.navbar-brand::after {
    display: none;
}

.navbar-brand img {
    height: 40px;
    width: auto;
    display: block;
    margin: 0;
    padding: 0;
}

@media (max-width: 768px) {
    .navbar-brand img {
        height: 30px;
    }
    .navbar-brand {
        margin-left: 0;
    }
}

/* 汉堡菜单按钮样式 */
.navbar-toggler {
    display: none;
    padding: 10px;
    background-color: transparent;
    border: none;
    cursor: pointer;
}

/* 汉堡菜单图标样式 - 修改为三条线 */
.navbar-toggler-icon {
    display: block;
    width: 25px;
    height: 2px;
    background-color: #fff;
    position: relative;
    transition: all 0.3s ease;
}

.navbar-toggler-icon::before,
.navbar-toggler-icon::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 2px;
    background-color: #fff;
    transition: all 0.3s ease;
}

.navbar-toggler-icon::before {
    top: -8px;  /* 上面的线 */
}

.navbar-toggler-icon::after {
    bottom: -8px;  /* 下面的线 */
}

/* 点击时的动画效果（可选） */
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
    background-color: transparent;  /* 中间线消失 */
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::before {
    transform: rotate(45deg);
    top: 0;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::after {
    transform: rotate(-45deg);
    bottom: 0;
}

/* 移动端导航菜单样式 */
@media (max-width: 768px) {
    .navbar-toggler {
        display: block;
    }
    
    .navbar-collapse {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(0, 27, 51, 0.95);
        padding: 20px;
        max-height: calc(100vh - 60px);
        overflow-y: auto;
        transition: all 0.3s ease-in-out;
        transform: translateY(-100%);
        opacity: 0;
    }

    .navbar-collapse.show {
        transform: translateY(0);
        opacity: 1;
        display: block !important;
    }
}

.navbar-collapse.show {
    display: flex !important;
}