/* 响应式设计 */
@media (max-width: 768px) {
    .hidden-mobile {
        display: none !important;
    }

    .visible-mobile {
        display: block !important;
    }

    /* 移动端菜单 */
    .menu-toggle {
        display: flex;
    }

    .nav {
        display: none;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: 0;
        width: 70%;
        height: 100%;
        background-color: #0b3d91;
        padding: 20px;
        z-index: 99;
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
    }

    .nav.active {
        display: flex;
        transform: translateX(0);
    }

    .nav a {
        padding: 10px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    /* 移动端菜单按钮动画 */
    .menu-toggle.active .bar:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active .bar:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    /* 关于我们部分 */
    .about {
        flex-direction: column;
        padding: 20px;
    }

    .about .about-left,
    .about .about-right {
        margin: 0;
        width: 100%;
    }

    .about .about-right {
        margin-top: 20px;
    }

    /* 主营业务部分 */
    .main-business {
        flex-direction: column;
        height: auto;
        padding: 20px;
        text-align: center;
    }

    .business-title {
        margin-bottom: 20px;
    }

    .main-business .business-list ul {
        grid-template-columns: 1fr;
    }

    /* 公告管理部分 */
    .main-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        padding-top: 0;
        margin-bottom: 20px;
    }

    /* 新闻动态部分 */
    .news-container {
        flex-direction: column;
        width: 100%;
    }

    .news-title,
    .news-content {
        width: 100%;
    }

    .news-title {
        margin-bottom: 20px;
        text-align: center;
    }

    .news-item img {
        width: 100%;
        float: none;
        margin-right: 0;
        margin-bottom: 10px;
    }

    .news-text {
        width: 100%;
        float: none;
    }

    .news-row {
        flex-direction: column;
    }

    .news-row .news-item {
        margin-bottom: 20px;
    }

    /* 联系我们部分 */
    .contact-container {
        flex-direction: column;
    }

    .contact-left,
    .contact-right {
        margin: 0;
        width: 100%;
    }

    .contact-right {
        margin-top: 20px;
    }

    /* banner部分 */
    .banner {
        height: 500px;
        justify-content: center;
        text-align: center;
    }

    .banner .banner-text h1 {
        font-size: 40px;
        text-align: center;
        line-height: 1.2;
    }

    .banner .banner-text p {
        font-size: 18px;
        line-height: 1.6;
    }
}

/* 平板设备样式 */
@media (min-width: 769px) and (max-width: 1024px) {
    .about .about-left,
    .about .about-right {
        margin: 0 5%;
    }

    .main-business {
        padding: 40px 5%;
    }

    .list-section .container,
    .news-container {
        width: 90%;
    }

    .contact-left,
    .contact-right {
        margin: 0 5%;
    }
}