/* 现代化下拉导航栏样式 */
.navbar .dropdown-menu {
    margin-top: 0;
    border: none;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(15px);
    background: rgba(255, 255, 255, 0.95);
    padding: 8px 0;
    min-width: 200px;
    transform-origin: top center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar .dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* 深色主题下拉菜单 */
.navbar.theme-dark .dropdown-menu,
.navbar.theme-default .dropdown-menu {
    background: rgba(45, 55, 72, 0.95);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.navbar.theme-dark .dropdown-item,
.navbar.theme-default .dropdown-item {
    color: rgba(255, 255, 255, 0.9);
    padding: 12px 20px;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.navbar.theme-dark .dropdown-item::before,
.navbar.theme-default .dropdown-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, rgba(74, 144, 226, 0.2), rgba(74, 144, 226, 0.1));
    transition: width 0.3s ease;
}

.navbar.theme-dark .dropdown-item:hover::before,
.navbar.theme-default .dropdown-item:hover::before {
    width: 100%;
}

.navbar.theme-dark .dropdown-item:hover,
.navbar.theme-default .dropdown-item:hover {
    color: #ffffff;
    background: transparent;
    transform: translateX(5px);
}

/* 浅色主题下拉菜单 */
.navbar.theme-light .dropdown-item {
    color: #2c3e50;
    padding: 12px 20px;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.navbar.theme-light .dropdown-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, rgba(74, 144, 226, 0.1), rgba(74, 144, 226, 0.05));
    transition: width 0.3s ease;
}

.navbar.theme-light .dropdown-item:hover::before {
    width: 100%;
}

.navbar.theme-light .dropdown-item:hover {
    color: #4a90e2;
    background: transparent;
    transform: translateX(5px);
}

/* 下拉箭头动画 */
.navbar .dropdown-toggle::after {
    transition: transform 0.3s ease;
    margin-left: 8px;
}

.navbar .dropdown.show .dropdown-toggle::after {
    transform: rotate(180deg);
}

/* 下拉菜单分隔线 */
.navbar .dropdown-divider {
    margin: 8px 0;
    border-color: rgba(0, 0, 0, 0.05);
}

.navbar.theme-dark .dropdown-divider,
.navbar.theme-default .dropdown-divider {
    border-color: rgba(255, 255, 255, 0.1);
}

/* 下拉菜单组标题 */
.navbar .dropdown-header {
    color: #6c757d;
    font-weight: 600;
    font-size: 0.875rem;
    padding: 8px 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.navbar.theme-dark .dropdown-header,
.navbar.theme-default .dropdown-header {
    color: rgba(255, 255, 255, 0.6);
}

/* 响应式下拉菜单 */
@media (max-width: 991.98px) {
    .navbar .dropdown-menu {
        border: none;
        box-shadow: none;
        background: transparent;
        padding: 0;
        margin: 0;
        transform: none;
        opacity: 1;
        visibility: visible;
    }
    
    .navbar .dropdown-item {
        padding: 10px 15px;
        border-left: 3px solid transparent;
        transition: all 0.3s ease;
    }
    
    .navbar .dropdown-item:hover {
        border-left-color: #4a90e2;
        background: rgba(74, 144, 226, 0.1);
        transform: none;
    }
    
    .navbar.theme-dark .dropdown-item:hover,
    .navbar.theme-default .dropdown-item:hover {
        background: rgba(255, 255, 255, 0.1);
    }
}

/* 下拉菜单动画增强 */
@keyframes dropdownFadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.navbar .dropdown-menu.show {
    animation: dropdownFadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 悬停时的发光效果 */
.navbar .dropdown-item:hover {
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.2);
}

/* 导航链接悬停效果增强 */
.navbar .nav-link {
    position: relative;
    transition: all 0.3s ease;
}

.navbar .nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #4a90e2, #7bb3f0);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

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

/* 下拉菜单项图标支持 */
.navbar .dropdown-item i,
.navbar .dropdown-item .icon {
    margin-right: 8px;
    width: 16px;
    text-align: center;
}

/* 下拉菜单徽章 */
.navbar .dropdown-item .badge {
    float: right;
    margin-left: 8px;
    font-size: 0.75rem;
    padding: 2px 6px;
}

/* 下拉菜单分组样式 */
.navbar .dropdown-menu .dropdown-item-group {
    padding: 8px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar .dropdown-menu .dropdown-item-group:last-child {
    border-bottom: none;
}

.navbar.theme-dark .dropdown-menu .dropdown-item-group,
.navbar.theme-default .dropdown-menu .dropdown-item-group {
    border-bottom-color: rgba(255, 255, 255, 0.1);
}