/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

a {
    text-decoration: none;
    color: inherit;
}

/* 头部导航 */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 100px;
}

.nav-container {
    width: 100%;
    margin: 0 auto;
    padding: 0 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo img {
    height: 60px;
    width: auto;
}

.logo-text {
    font-size: 18px;
    font-weight: bold;
    color: #000000;
    line-height: 1.1;
    max-width: 440px;
    border-left: 1px solid #ddd;
    padding-left: 15px;
}

/* PC端导航 */
.nav-wrapper {
    display: flex;
    align-items: center;
    margin-left: auto;
}

/* 导航栏图标 */
.nav-icons {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-left: 20px;
}

/* 导航栏右侧容器 */
.nav-right {
    display: flex;
    align-items: center;
}

.nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #019cf5;
    transition: color 0.3s;
    width: 20px;
    height: 20px;
}

.nav-icon:hover {
    color: #f72c2c;
}

/* Email图标 - 张开信封 */
.nav-icon-email {
    position: relative;
    width: 20px;
    height: 16px;
}

.nav-icon-email::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 16px;
    border: 2px solid currentColor;
    border-radius: 2px;
}

.nav-icon-email::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 8px solid currentColor;
}

/* 搜索放大镜图标 */
.nav-icon-search {
    position: relative;
}

.nav-icon-search::before {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    border: 2px solid currentColor;
    border-radius: 50%;
}

.nav-icon-search::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 2px;
    background: currentColor;
    transform: rotate(45deg);
    bottom: 2px;
    right: 0;
}

/* 搜索容器 */
.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box {
    position: absolute;
    right: 0px;
    display: flex;
    align-items: center;
    background: #fff;
    border-radius: 4px;
    padding: 0;
    width: 0;
    overflow: hidden;
    transition: width 0.3s ease, padding 0.3s ease;
    box-shadow: 0 2px 10px rgba(51, 4, 219, 0.1);
}

.search-box.active {
    width: 250px;
    padding: 5px 10px;
}

.search-form {
    display: flex;
    align-items: center;
    width: 100%;
}

.search-input {
    border: none;
    outline: none;
    width: 200px;
    font-size: 14px;
    padding: 5px;
}

.search-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    color: #666;
    position: relative;
    flex-shrink: 0;
}

.search-btn::before {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    border: 2px solid currentColor;
    border-radius: 50%;
}

.search-btn::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 2px;
    background: currentColor;
    transform: rotate(45deg);
    bottom: 2px;
    right: 0;
}

.search-btn:hover {
    color: #667eea;
}

/* 主导航 */
.main-nav {
    display: flex;
    list-style: none;
    gap: 0;
}

.main-nav li {
    position: relative;
}

.main-nav li > a {
    display: block;
    padding: 25px 20px;
    color: #333;
    font-size: 18px;
    transition: color 0.3s;
    font-weight: 600;
    white-space: nowrap;
}

.main-nav li > a:hover {
    color: #667eea;
}

.main-nav li > a.active {
    color: #667eea;
    font-weight: 700;
}

/* 下拉菜单 */
.has-submenu {
    display: flex;
    align-items: center;
}

.has-submenu > a {
    padding-right: 5px !important;
}

.submenu-toggle {
    width: 20px;
    height: 20px;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.submenu-toggle::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid #666;
    border-bottom: 0;
    transition: transform 0.3s;
    transform-origin: center center;
}

.submenu-toggle.active::after,
.has-submenu:hover .submenu-toggle::after {
    transform: rotate(180deg);
}

.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    min-width: 220px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s;
    padding: 10px 0;
}

.has-submenu:hover .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.submenu a {
    display: block;
    padding: 10px 20px;
    color: #555;
    font-size: 16px;
    transition: all 0.3s;
}

.submenu a:hover {
    background: #f5f5f5;
    color: #667eea;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 25px;
    height: 20px;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: #333;
    transition: all 0.3s;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Banner轮播区域 */
.banner {
    position: relative;
    width: 100%;
    height: 50vw;
    min-height: 300px;
    max-height: 672px;
    margin-top: 90px;
    overflow: hidden;
}

.banner-slides {
    position: relative;
    width: 100%;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.banner-slide.active {
    opacity: 1;
}

.banner-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 轮播指示器 */
.banner-indicators {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: background 0.3s;
}

.indicator.active {
    background: #fff;
}

/* 左右箭头 */
.banner-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background: rgba(0, 0, 0, 0.3);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    border-radius: 50%;
    text-decoration: none;
    transition: background 0.3s;
}

.banner-arrow:hover {
    background: rgba(0, 0, 0, 0.6);
}

.banner-arrow-left {
    left: 20px;
}

.banner-arrow-right {
    right: 20px;
}

/* ========================================
   新闻资讯区
   ======================================== */
   
.news-indexlist {
    margin: 0 auto;
    padding: 0 20px;
}


.news-section {
    padding: 60px 0;
    background: #fff;
}

.news-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 50px;
}

.news-center-title {
    text-align: center;
    font-size: 32px;
    font-weight: bold;
    color: #0047ab;
    margin-bottom: 40px;
    text-transform: uppercase;
}

.news-wrapper {
    display: flex;
    gap: 40px;
}

.news-left {
    flex: 1;
}

.news-right {
    width: 380px;
}

.news-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #0047ab;
}

.news-header h3 {
    font-size: 20px;
    font-weight: bold;
    color: #333;
}

.more-link {
    color: #666;
    font-size: 14px;
    text-decoration: none;
}

.more-link:hover {
    color: #0047ab;
}

/* 大图新闻 */
.featured-news {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
    padding-bottom: 25px;
    border-bottom: 1px solid #eee;
}

.featured-image {
    width: 280px;
    height: 180px;
    flex-shrink: 0;
    overflow: hidden;
}

.featured-image a {
    display: block;
    width: 100%;
    height: 100%;
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.featured-image a:hover img {
    transform: scale(1.05);
}

.featured-content {
    flex: 1;
}

.featured-title {
    font-size: 16px;
    font-weight: bold;
    color: #333;
    line-height: 1.5;
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.featured-title .news-arrow {
    width: 0;
    height: 0;
    border-left: 6px solid #0047ab;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    flex-shrink: 0;
    margin-top: 6px;
}

.featured-title a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s;
}

.featured-title a:hover {
    color: #0047ab;
}

.featured-date {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #999;
    font-size: 14px;
    margin-bottom: 12px;
}

.date-icon {
    width: 14px;
    height: 14px;
    border: 2px solid #999;
    border-radius: 50%;
    display: inline-block;
    position: relative;
    transition: border-color 0.3s ease;
}

.date-icon::before {
    content: '';
    position: absolute;
    width: 2px;
    height: 5px;
    background: #999;
    top: 2px;
    left: 50%;
    transform: translateX(-50%);
    transition: background-color 0.3s ease;
}

.date-icon::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 2px;
    background: #999;
    top: 6px;
    left: 50%;
    transform-origin: left center;
    transition: background-color 0.3s ease;
}

.research-item:hover .date-icon {
    border-color: #0047ab;
}

.research-item:hover .date-icon::before,
.research-item:hover .date-icon::after {
    background-color: #0047ab;
}

.featured-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 10px;
}

.featured-more-btn {
    display: inline-block;
    padding: 6px 20px;
    background: #019cf5;
    color: #fff;
    font-size: 13px;
    text-decoration: none;
    border-radius: 15px;
    float: right;
    transition: background 0.3s;
}

.featured-more-btn:hover {
    background: #FF7F00;
}

/* 新闻列表交互样式 */
.news-list-container {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.news-item {
    border-bottom: 1px solid #eee;
    padding: 12px 0;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.news-item:hover {
    background-color: #f8fbff;
    transform: translateX(5px);
}

.news-item:hover .simple-title {
    color: #0047ab;
}

.news-item:last-child {
    border-bottom: none;
}

/* 完整样式（默认第一个显示） */
.news-item .news-full {
    display: none;
}

.news-item.active .news-full {
    display: flex;
    gap: 20px;
}

.news-item.active {
    padding: 20px 10px;
}

/* 简化样式（标题+日期） */
.news-item .news-simple {
    display: flex;
    align-items: center;
    gap: 10px;
}

.news-item.active .news-simple {
    display: none;
}

.news-simple .news-arrow {
    width: 0;
    height: 0;
    border-left: 6px solid #0047ab;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    flex-shrink: 0;
}

.news-simple .simple-title {
    flex: 1;
    font-size: 16px;
    color: #333;
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.news-simple .simple-title:hover {
    color: #0047ab;
}

.news-simple .simple-date {
    font-size: 13px;
    color: #999;
    flex-shrink: 0;
}

/* 通知列表 */
.notification-list {
    list-style: none;
}

.notification-list li {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 15px;
    border-bottom: 1px dotted #ddd;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.notification-list li:hover {
    background-color: #f8fbff;
    transform: translateX(5px);
}

.notification-list li:hover .notification-title {
    color: #0047ab;
}

.notification-date {
    width: 50px;
    height: 55px;
    background: #0047ab;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.notification-date .day {
    font-size: 24px;
    font-weight: bold;
    line-height: 1;
}

.notification-date .month {
    font-size: 11px;
    margin-top: 2px;
}

.notification-title {
    flex: 1;
    font-size: 16px;
    color: #333;
    line-height: 1.5;
    text-decoration: none;
    transition: color 0.3s;
}

.notification-title:hover {
    color: #0047ab;
}

.notification-list li:hover .notification-date {
    background: #e6f0ff;
    color: #0047ab;
}

/* ========================================
   科研成果区
   ======================================== */
.research-section {
    padding: 60px 0;
    background: #f5f5f5;
}

.research-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 50px;
}

.research-title {
    text-align: center;
    font-size: 32px;
    font-weight: bold;
    color: #333;
    margin-bottom: 40px;
}

.research-slider-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 20px;
}

.research-slider {
    flex: 1;
    overflow: hidden;
}

.research-track {
    display: flex;
    gap: 30px;
    padding-top: 10px;
}

/* 走马灯动画效果 */
.marquee-track {
    animation: marquee-scroll 30s linear infinite;
}

@keyframes marquee-scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* 走马灯容器可拖拽 */
.research-slider {
    cursor: grab;
}

.research-slider:active {
    cursor: grabbing;
}

.research-item {
    flex: 0 0 calc(25% - 22.5px);
    background: #fff;
    padding: 15px;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid transparent;
}

.research-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0, 71, 171, 0.15);
    border-color: #0047ab;
}

.research-item:hover .research-item-title {
    color: #0047ab;
}

.research-item:hover .research-date {
    color: #666;
}

.research-item:hover .date-icon {
    background-color: #0047ab;
}

.research-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
    margin-bottom: 15px;
}

.research-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.research-image:hover img {
    transform: scale(1.1);
}

.research-item-title {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    line-height: 1.5;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.3s ease;
}

.research-date {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #999;
    font-size: 13px;
    transition: color 0.3s ease;
}

.research-date {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #999;
    font-size: 13px;
    transition: color 0.3s ease;
}

.research-arrow {
    width: 50px;
    height: 50px;
    border: none;
    background: rgba(255, 255, 255, 0.9);
    color: #666;
    font-size: 24px;
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: all 0.3s;
    flex-shrink: 0;
    z-index: 10;
}

.research-arrow:hover {
    background: #0047ab;
    color: #fff;
}

/* ========================================
   合作伙伴区
   ======================================== */
.partners-section {
    padding: 60px 0;
    background: #fff;
}

.partners-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 50px;
}

.partners-title {
    text-align: center;
    font-size: 32px;
    font-weight: bold;
    color: #0047ab;
    margin-bottom: 50px;
    text-transform: uppercase;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 30px;
}

.partner-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 20px;
    border: 1px solid #e0e0e0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
    text-decoration: none;
    color: inherit;
    opacity: 0;
    transform: translateY(30px);
    animation: partnerFadeIn 0.8s ease forwards;
}

/* 依次延迟显示动画 */
.partner-item[data-delay="0"] { animation-delay: 0s; }
.partner-item[data-delay="1"] { animation-delay: 0.1s; }
.partner-item[data-delay="2"] { animation-delay: 0.2s; }
.partner-item[data-delay="3"] { animation-delay: 0.3s; }
.partner-item[data-delay="4"] { animation-delay: 0.4s; }
.partner-item[data-delay="5"] { animation-delay: 0.5s; }
.partner-item[data-delay="6"] { animation-delay: 0.6s; }
.partner-item[data-delay="7"] { animation-delay: 0.7s; }
.partner-item[data-delay="8"] { animation-delay: 0.8s; }

@keyframes partnerFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.partner-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.partner-logo {
    width: 100%;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
}

.partner-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.partner-name {
    font-size: 16px;
    color: #333;
    line-height: 1.5;
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* ========================================
   友情链接区
   ======================================== */
.links-section {
    padding: 60px 0;
    background: url('images/links_bg.jpg') no-repeat center center;
    background-size: cover;
    position: relative;
}

.links-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 71, 171, 0.7);
}

.links-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 50px;
    position: relative;
    z-index: 1;
}

.links-title {
    text-align: center;
    font-size: 32px;
    font-weight: bold;
    color: #fff;
    margin-bottom: 40px;
    text-transform: uppercase;
}

.links-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
    text-align: center;
}

.links-row {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px 15px;
}

.links-row a {
    color: #fff;
    font-size: 16px;
    text-decoration: none;
    transition: color 0.3s;
}

.links-row a:hover {
    color: #ffeb3b;
}

.links-separator {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    padding: 30px 0;
    background: url('images/links_bg.jpg') no-repeat center center;
    background-size: cover;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 1, 54, 0.3);
}

.footer-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 50px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px 15px;
    margin-bottom: 15px;
}

.footer-nav a {
    color: #fff;
    font-size: 16px;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-nav a:hover {
    color: #ffeb3b;
}

.footer-separator {
    color: rgba(255, 255, 255, 0.6);
    font-size: 16px;
}

.footer-copyright {
    color: #fff;
    font-size: 16px;
}

/* ========================================
   响应式样式
   ======================================== */

/* 1440px及以下 */
@media (max-width: 1440px) {
    .main-nav li > a {
        font-size: 16px;
    }

    .submenu a {
        font-size: 14px;
    }

    .logo img {
        height: 45px;
    }

    .logo-text {
        font-size: 16px;
        max-width: 260px;
    }

    .nav-icon-email::before {
        width: 16px;
        height: 14px;
    }
}

/* 1360px及以下 */
@media (max-width: 1360px) {
    .main-nav li > a {
        font-size: 12px;
    }

    .submenu a {
        font-size: 12px;
    }

    .logo img {
        height: 40px;
    }

    .logo-text {
        font-size: 14px;
        max-width: 220px;
    }
}

/* 1200px及以下 */
@media (max-width: 1200px) {
    /* 新闻资讯区响应式 */
    .news-wrapper {
        flex-direction: column;
    }

    .news-right {
        width: 100%;
    }

    /* 科研成果区响应式 */
    .research-item {
        flex: 0 0 calc(33.333% - 20px);
    }

    /* 合作伙伴区响应式 */
    .partners-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }
}

/* 1160px及以下 */
@media (min-width: 769px) and (max-width: 1160px) {
    .logo {
        flex-direction: column;
        align-items: flex-start;
        gap: 1px;
    }

    .main-nav li > a {
        padding: 25px 10px;
    }

    .logo-text {
        font-size: 12px;
        min-width: 290px;
    }
}

/* 768px及以下 - 移动端 */
@media (max-width: 768px) {
    /* 头部导航响应式 */
    .nav-container {
        padding: 0 15px;
    }

    /* 走马灯加速 - 移动端10秒 */
    .marquee-track {
        animation: marquee-scroll 10s linear infinite;
    }

    .logo img {
        height: 35px;
    }

    .logo-text {
        font-size: 14px;
        max-width: 220px;
    }

    .main-nav li > a {
        font-size: 16px;
    }

    .submenu a {
        font-size: 16px;
    }    

    .nav-right {
        display: flex;
        align-items: center;
        gap: 15px;
    }

    .nav-icons {
        display: flex;
        align-items: center;
        gap: 15px;
        margin-left: 0;
    }

    .search-container {
        position: relative;
    }

    .search-box {
        position: fixed;
        right: 55px;
        z-index: 1001;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .nav-wrapper {
        position: fixed;
        top: 100px;
        left: 0;
        right: 0;
        height: calc(100vh - 100px);
        background: #fff;
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        display: block;
        z-index: 999;
    }

    .nav-wrapper.active {
        max-height: calc(100vh - 100px);
        overflow-y: auto;
    }

    .main-nav {
        flex-direction: column;
        padding: 10px 0;
    }

    .main-nav li {
        display: block;
        border-bottom: 1px solid #eee;
    }

    .main-nav li:last-child {
        border-bottom: none;
    }

    .main-nav li > a {
        padding: 15px 20px;
    }

    .has-submenu {
        flex-wrap: wrap;
        position: relative;
    }

    .has-submenu > a {
        width: 100%;
        padding-right: 50px !important;
    }

    .submenu-toggle {
        position: absolute;
        right: 0;
        top: 0;
        height: 51px;
        width: 50px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-left: 1px solid #eee;
        padding: 0;
    }

    .submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s;
        width: 100%;
        background: #f9f9f9;
        padding: 0;
    }

    .submenu.active {
        max-height: 800px;
    }

    .submenu a {
        padding-left: 40px;
        border-bottom: 1px solid #eee;
    }

    .submenu a:last-child {
        border-bottom: none;
    }

    .banner {
        height: 300px;
        margin-top: 70px;
    }

    .banner-arrow {
        width: 30px;
        height: 30px;
        font-size: 16px;
    }

    /* 新闻资讯区响应式 */
    .news-container {
        padding: 0 20px;
    }

    .news-center-title {
        font-size: 24px;
    }

    .news-item.active .news-full {
        flex-direction: column;
    }

    .featured-image {
        width: 100%;
        height: 200px;
    }

    .featured-title {
        margin-top: 10px;
    }

    /* 科研成果区响应式 */
    .research-title {
        font-size: 24px;
    }

    .research-container {
        padding: 0 20px;
    }

    .research-item {
        flex: 0 0 100%;
    }

    .research-arrow {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }

    /* 合作伙伴区响应式 */
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 15px;
    }

    .partners-container {
        padding: 0 20px;
    }

    .partners-title {
        font-size: 24px;
    }

    .partner-logo {
        height: 100px;
    }

    /* 页脚响应式 */
    .footer-container {
        padding: 0 20px;
    }

    .footer-nav a {
        font-size: 12px;
    }

    .footer-copyright {
        font-size: 12px;
    }

    /* 友情链接区响应式 */
    .links-container {
        padding: 0 20px;
    }

    .links-title {
        font-size: 24px;
    }

    .links-row a {
        font-size: 12px;
    }
}

/* 640px及以下 */
@media (max-width: 640px) {
    .logo {
        flex-direction: column;
        align-items: flex-start;
        gap: 1px;
    }

    .logo img {
        height: 35px;
    }

    .logo-text {
        font-size: 11px;
        max-width: 95%;
    }
}

/* 480px及以下 */
@media (max-width: 480px) {
    /* 页脚响应式 */
    .footer-nav {
        display: none;
    }

    /* 走马灯加速 - 移动端10秒 */
    .marquee-track {
        animation: marquee-scroll 10s linear infinite;
    }

    /* 合作伙伴区响应式 */
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .partner-item {
        padding: 15px 10px;
    }

    .partner-name {
        font-size: 12px;
    }

    /* 友情链接区响应式 */
    .links-row {
        flex-direction: column;
        gap: 10px;
    }

    .links-row a {
        width: 100%;
        text-align: center;
    }

    .links-separator {
        display: none;
    }
}