/* 下拉菜单样式 */
.nav .dropdown {
    position: relative;
    display: inline-block;
}

.nav .dropdown-content {
    display: none;
    position: absolute;
    background-color: #fff;
    min-width: 180px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.3);
    border-radius: 4px;
    z-index: 10;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s, transform 0.3s;
}

.nav .dropdown:hover .dropdown-content {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.nav .dropdown-content a {
    color: #666;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
    line-height: normal;
    font-size: 16px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: all 0.2s ease;
}

.nav .dropdown-content a:last-child {
    border-bottom: none;
}

.nav .dropdown-content a:hover {
    background-color: #f9f9f9;
    color: #000;
    padding-left: 20px;
}

.nav .dropbtn::after {
    content: '▼';
    font-size: 10px;
    margin-left: 5px;
    vertical-align: middle;
    transition: transform 0.3s;
}

.nav .dropdown:hover .dropbtn::after {
    transform: rotate(180deg);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav .dropdown-content {
        position: static;
        box-shadow: none;
        background-color: rgba(0,0,0,0.03);
        display: none;
    }
    
    .nav .dropdown:hover .dropdown-content {
        display: none; /* 移动端需要点击才显示 */
    }
    
    .nav .dropdown.active .dropdown-content {
        display: block;
    }
}