/* 下拉菜单样式 */
        .dropdown {
            position: relative;
        }
        
        .dropdown-toggle::after {
            content: '▼';
            font-size: 0.7rem;
            margin-left: 5px;
        }
        
        .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            background-color: white;
            min-width: 200px;
            box-shadow: var(--box-shadow);
            border-radius: var(--border-radius);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: var(--transition);
            z-index: 1000;
        }
        
        .dropdown:hover .dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        
        .dropdown-menu li {
            margin: 0;
            border-bottom: 1px solid #f0f0f0;
        }
        
        .dropdown-menu li:last-child {
            border-bottom: none;
        }
        
        .dropdown-menu a {
            display: block;
            padding: 12px 20px;
            transition: var(--transition);
        }
        
        .dropdown-menu a:hover {
            background-color: var(--light-color);
            color: var(--secondary-color);
        }
        @media (max-width: 992px) {
             .dropdown-menu {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                box-shadow: none;
                background-color: transparent;
                display: none;
                margin-top: 10px;
            }
            
            .dropdown.active .dropdown-menu {
                display: block;
            }
            
            .dropdown-toggle::after {
                content: '►';
            }
            
            .dropdown.active .dropdown-toggle::after {
                content: '▼';
            }
            
            .mobile-toggle {
                display: block;
            }
        }
        .lang-btn {
            background: none;
            border: 1px solid var(--primary-color);
            color: var(--primary-color);
            padding: 5px 10px;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        
        .lang-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .lang-btn:hover {
            background-color: var(--secondary-color);
            color: white;
            border-color: var(--secondary-color);
        }