/* 高级导航菜单样式 */
.main-navigation {
    position: relative;
    z-index: 1000;
}

.nav-menu {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
    margin-left: 1px;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 1rem 1.25rem;
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-item.active > .nav-link {
    color: #165DFF;
    background-color: rgba(22, 93, 255, 0.05);
}

/* 下拉菜单样式 */
.sub-menu-container {
    position: absolute;
    top: 100%;
    left: 0;
    width: 280px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 999;
    overflow: hidden;
}

.nav-item.has-dropdown:hover > .sub-menu-container {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.sub-menu {
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
}

.sub-menu .nav-item {
    margin: 0;
    width: 100%;
}

.sub-menu .nav-link {
    padding: 0.75rem 1.25rem;
    white-space: nowrap;
    border-bottom: 1px solid #f5f5f5;
}

.sub-menu .nav-link:last-child {
    border-bottom: none;
}

.sub-menu .nav-link:hover {
    background-color: rgba(22, 93, 255, 0.05);
    padding-left: 1.5rem;
}

/* 多级下拉菜单 */
.sub-menu-level-1 {
    left: 100%;
    top: 0;
}

.nav-item.has-dropdown .dropdown-toggle {
    margin-left: 0.5rem;
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}

.nav-item.has-dropdown:hover .dropdown-toggle {
    transform: rotate(180deg);
}

/* 移动菜单样式 */
@media (max-width: 992px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        border-radius: 8px;
        padding: 1rem 0;
        z-index: 999;
    }
    
    .nav-menu.toggled {
        display: block;
    }
    
    .nav-item {
        width: 100%;
        margin: 0;
    }
    
    .nav-link {
        padding: 0.75rem 1.5rem;
        border-bottom: 1px solid #f5f5f5;
    }
    
    .sub-menu-container {
        position: relative;
        width: 100%;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 0 1.5rem;
        background: transparent;
    }
    
    .sub-menu {
        padding: 0;
    }
    
    .sub-menu .nav-link {
        padding-left: 1rem;
    }
    
    .sub-menu-level-1 {
        left: 0;
        top: 0;
    }
    
    .menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 0.75rem 1rem;
        background: #f8f9fa;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        transition: all 0.3s ease;
    }
    
    .menu-toggle:hover {
        background: #e9ecef;
    }
    
    .menu-toggle-icon {
        position: relative;
        width: 24px;
        height: 24px;
        margin-left: 0.5rem;
    }
    
    .menu-toggle-icon span {
        position: absolute;
        left: 0;
        width: 100%;
        height: 2px;
        background-color: #333;
        transition: all 0.3s ease;
    }
    
    .menu-toggle-icon span:nth-child(1) {
        top: 4px;
    }
    
    .menu-toggle-icon span:nth-child(2) {
        top: 11px;
    }
    
    .menu-toggle-icon span:nth-child(3) {
        bottom: 4px;
    }
    
    .menu-toggle.toggled .menu-toggle-icon span:nth-child(1) {
        transform: rotate(45deg);
        top: 11px;
    }
    
    .menu-toggle.toggled .menu-toggle-icon span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.toggled .menu-toggle-icon span:nth-child(3) {
        transform: rotate(-45deg);
        bottom: 11px;
    }
}

/* 桌面菜单动画效果 */
@media (min-width: 993px) {
    .nav-link::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        width: 0;
        height: 2px;
        background-color: #165DFF;
        transition: all 0.3s ease;
        transform: translateX(-50%);
    }
    
    .nav-link:hover::after,
    .nav-item.active > .nav-link::after {
        width: 30%;
    }
    
    /* 下拉菜单项悬停效果 */
    .sub-menu .nav-link::after {
        display: none;
    }
}