/* 移动端底部导航 */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.mobile-nav-items {
    display: flex;
    justify-content: space-around;
    padding: 0.8rem 0;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: #666;
    font-size: 0.8rem;
    transition: color 0.3s;
    flex: 1;
}

.nav-item i {
    font-size: 1.4rem;
    margin-bottom: 0.3rem;
}

.nav-item.active {
    color: var(--secondary-color);
}

/* 响应式设计 - 移动端显示底部导航 */
@media (max-width: 768px) {
    /* 移动端显示底部导航，隐藏桌面页脚 */
    .footer-desktop {
        display: none;
    }
    
    .mobile-nav {
        display: block;
    }
    
    main {
        padding-bottom: 5rem; /* 为底部导航留出空间 */
    }
}