/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

/* 排版 */
h1, h2, h3, h4 {
    font-family: 'Noto Serif SC', serif;
    font-weight: 700;
    color: #1a365d;
}

h1 {
    font-size: 2rem;
    line-height: 1.2;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background-color: #3b82f6;
}

h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

p {
    margin-bottom: 1rem;
    color: #4a5568;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 头部导航 */
header {
    background-color: #0a2463;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.5rem 2rem;
    transition: all 0.3s ease;
}

/* 导航收缩效果 */
header.scrolled {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header.scrolled nav {
    padding: 0.5rem 2rem;
}

header.scrolled .logo h1 {
    font-size: 1.2rem;
}

header.scrolled .nav-right ul li a {
    padding: 0.75rem 1.25rem;
}

/* 鼠标悬停展开效果 */
nav:hover {
    padding: 1rem 2rem;
}

nav:hover .logo h1 {
    font-size: 1.5rem;
}

nav:hover .nav-right ul li a {
    padding: 1rem 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo img {
    width: 50px;
    height: 50px;
}

.logo h1 {
    font-size: 1.2rem;
    color: white;
    font-weight: 700;
    transition: all 0.3s ease;
}

/* 汉堡菜单 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: white;
    border-radius: 3px;
    transition: all 0.3s ease;
}

.nav-right ul {
    display: flex;
    list-style: none;
    gap: 0;
    flex-wrap: nowrap;
    white-space: nowrap;
}

.nav-right ul li {
    position: relative;
    flex-shrink: 0;
}

.nav-right ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease, padding 0.3s ease;
    padding: 0.75rem 1.25rem;
    display: block;
}

.nav-right ul li a:hover {
    background-color: #1e3a8a;
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #0a2463;
    min-width: 200px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    opacity: 0;
    visibility: hidden;
    z-index: 1001;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    border: 1px solid rgba(255,255,255,0.1);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
}

.dropdown-menu li a {
    padding: 0.75rem 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: white;
}

.dropdown-menu li a:hover {
    background-color: #1e3a8a;
}

/* 用户菜单样式 */
#user-menu .dropdown-menu {
    right: 0;
    left: auto;
}





/* 横幅区域 */
.banner {
    position: relative;
    overflow: hidden;
    height: 400px;
}

.banner-content {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 3rem 2rem;
    background: linear-gradient(to top, rgba(10, 36, 99, 0.9), rgba(10, 36, 99, 0.6));
    color: white;
}

/* 轮播图样式 */
.carousel {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-inner {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease;
}

.carousel-item.active {
    opacity: 1;
}

.carousel-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 3rem 2rem;
    background: linear-gradient(to top, rgba(10, 36, 99, 0.9), rgba(10, 36, 99, 0.6));
    color: white;
}

.carousel-caption h2 {
    color: white;
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.carousel-caption p {
    color: rgba(255,255,255,0.9);
    font-size: 1.1rem;
    max-width: 600px;
}

.carousel-control {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(10, 36, 99, 0.5);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 2rem;
    cursor: pointer;
    z-index: 10;
    transition: all 0.3s ease;
}

.carousel-control:hover {
    background-color: rgba(10, 36, 99, 0.7);
    transform: translateY(-50%) scale(1.1);
}

.carousel-control.prev {
    left: 2rem;
}

.carousel-control.next {
    right: 2rem;
}

.carousel-indicators {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
    z-index: 10;
}

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

.indicator.active {
    background-color: white;
    transform: scale(1.2);
}

/* 特别推荐 */
.recommended {
    padding: 3rem 0;
    background-color: white;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid #3b82f6;
    padding-bottom: 0.5rem;
}

.section-header h3 {
    font-size: 1.3rem;
    margin-bottom: 0;
}

.more-link {
    color: #3b82f6;
    text-decoration: none;
    font-weight: 500;
}

.more-link:hover {
    text-decoration: underline;
}

.recommended-content {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
}

.recommended-item h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: #1a365d;
}

.recommended-item p {
    color: #4a5568;
}

/* 通知公告 */
.notice {
    padding: 3rem 0;
    background-color: #f7fafc;
}

.notice-list ul {
    list-style: none;
}

.notice-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notice-list li:last-child {
    border-bottom: none;
}

.notice-date {
    color: #718096;
    font-size: 0.9rem;
    margin-right: 1rem;
}

.notice-list li a {
    color: #2d3748;
    text-decoration: none;
    flex: 1;
    transition: color 0.3s ease;
}

.notice-list li a:hover {
    color: #3b82f6;
}

/* 按钮样式 */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background-color: #0a2463;
    color: white;
}

.btn-primary:hover {
    background-color: #1e3a8a;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.btn-secondary {
    background-color: transparent;
    color: #0a2463;
    border: 1px solid #0a2463;
}

.btn-secondary:hover {
    background-color: #0a2463;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* 简介区域 */
.intro {
    padding: 2.5rem 0;
    background-color: white;
}

.intro-content {
    max-width: 800px;
}

/* 研究领域 */
.research-areas {
    padding: 2.5rem 0;
    background-color: #f7fafc;
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.research-item {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    text-align: center;
}

.research-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.research-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background-color: #ebf8ff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.research-icon img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

/* 新闻动态 */
.news {
    padding: 4rem 0;
    background-color: white;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.news-item {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.news-date {
    color: #718096;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.news-link {
    display: inline-block;
    color: #3b82f6;
    text-decoration: none;
    font-weight: 500;
    margin-top: 1rem;
    transition: color 0.3s ease;
}

.news-link:hover {
    color: #1e3a8a;
    text-decoration: underline;
}

/* 使命与愿景 */
.mission {
    padding: 2.5rem 0;
    background-color: #f7fafc;
}

.mission-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.mission-item {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.mission-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

/* 合作与交流 */
.cooperation {
    padding: 2.5rem 0;
    background-color: white;
}


/* 页脚 */
footer {
    background-color: #0a2463;
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-info h3 {
    color: white;
    margin-bottom: 1.5rem;
}

.footer-info p {
    color: rgba(255,255,255,0.8);
    margin-bottom: 0.5rem;
}

.footer-links h4 {
    color: white;
    margin-bottom: 1.5rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links ul li {
    margin-bottom: 0.5rem;
}

.footer-links ul li a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links ul li a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1.5rem;
    text-align: center;
    color: rgba(255,255,255,0.6);
}

/* 响应式设计 */
/* 平板设备 */
@media (max-width: 1024px) {
    .logo h1 {
        font-size: 1.3rem;
    }
    
    .nav-right ul li a {
        padding: 0.75rem 1rem;
    }
    
    .banner-content h2 {
        font-size: 2rem;
    }
}

/* 移动设备 */
@media (max-width: 768px) {
    nav {
        flex-direction: row;
        justify-content: space-between;
        padding: 1rem;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .nav-right {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #0a2463;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .nav-right.active {
        max-height: 500px;
    }
    
    .nav-right ul {
        flex-direction: column;
    }
    
    .nav-right ul li {
        width: 100%;
    }
    
    .nav-right ul li a {
        padding: 1rem;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .dropdown-menu {
        position: static;
        background-color: #1e3a8a;
        box-shadow: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .dropdown:hover .dropdown-menu {
        max-height: 300px;
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .banner-content {
        padding: 0 1rem;
    }
    
    .banner-content h2 {
        font-size: 1.8rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .research-grid,
    .news-grid,
    .members-list,
    .articles-list {
        grid-template-columns: 1fr;
    }    
    
    .profile-container {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* 会员查询样式 */
.member-search {
    padding: 2.5rem 0;
    background-color: white;
}

.search-form {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.search-form h3 {
    margin-bottom: 1.5rem;
}

.search-results {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background-color: white;
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.result-info h4 {
    margin-bottom: 0.5rem;
    color: #1a365d;
}

.result-info p {
    margin-bottom: 0.25rem;
    color: #4a5568;
}

.no-results {
    text-align: center;
    padding: 3rem;
    color: #718096;
}

/* 公告样式 */
.notices {
    padding: 2.5rem 0;
    background-color: white;
}

.notice-form {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.notice-form h3 {
    margin-bottom: 1.5rem;
}

.notice-item {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.notice-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.notice-header h4 {
    margin-bottom: 0;
    color: #1a365d;
    flex: 1;
}

.notice-date {
    color: #718096;
    font-size: 0.9rem;
    margin-left: 1rem;
}

.notice-content {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.notice-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid #e2e8f0;
}

.notice-author {
    color: #718096;
    font-size: 0.9rem;
}

.no-notices {
    text-align: center;
    padding: 3rem;
    color: #718096;
}

/* 机构子页面样式 */
.department-intro {
    padding: 4rem 0;
    background-color: white;
}

.department-intro p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.research-directions {
    padding: 4rem 0;
    background-color: #f7fafc;
}

.directions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.direction-item {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.direction-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.direction-item h4 {
    margin-bottom: 1rem;
    color: #1a365d;
}

.team-members {
    padding: 4rem 0;
    background-color: white;
}

.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.member-item {
    text-align: center;
    padding: 2rem;
    background-color: #f7fafc;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.member-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.member-item img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: 1.5rem;
    object-fit: cover;
}

.member-item h4 {
    margin-bottom: 0.5rem;
    color: #1a365d;
}

.member-item p {
    margin-bottom: 0.25rem;
    color: #718096;
}

.research-achievements {
    padding: 4rem 0;
    background-color: #f7fafc;
}

.achievements-list {
    margin-top: 2rem;
}

.achievement-item {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.achievement-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.achievement-item h4 {
    margin-bottom: 1rem;
    color: #1a365d;
}

/* 后台管理页面样式 */
.admin-panel {
    padding: 4rem 0;
    background-color: white;
}

.admin-panel .container {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 2rem;
}

.admin-menu {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.admin-menu h3 {
    margin-bottom: 1.5rem;
    color: #1a365d;
}

.admin-menu ul {
    list-style: none;
}

.admin-menu ul li {
    margin-bottom: 1rem;
}

.admin-menu ul li a {
    display: block;
    padding: 0.75rem 1rem;
    color: #4a5568;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.admin-menu ul li a:hover {
    background-color: #e2e8f0;
    color: #1a365d;
}

.admin-content {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.admin-section h3 {
    margin-bottom: 2rem;
    color: #1a365d;
}

.carousel-form {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.carousel-form h4 {
    margin-bottom: 1.5rem;
    color: #2d3748;
}

.carousel-list {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.carousel-list h4 {
    margin-bottom: 1.5rem;
    color: #2d3748;
}

.carousel-item-admin {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #e2e8f0;
    margin-bottom: 1rem;
}

.carousel-item-admin img {
    width: 100px;
    height: 60px;
    object-fit: cover;
    border-radius: 4px;
    margin-right: 1rem;
}

.carousel-item-admin .carousel-info {
    flex: 1;
}

.carousel-item-admin h5 {
    margin-bottom: 0.5rem;
    color: #1a365d;
}

.carousel-item-admin p {
    margin-bottom: 0;
    color: #718096;
    font-size: 0.9rem;
}

.carousel-item-admin .carousel-actions {
    display: flex;
    gap: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .admin-panel .container {
        grid-template-columns: 1fr;
    }
    
    .admin-menu {
        order: 2;
    }
    
    .admin-content {
        order: 1;
    }
}

/* 小屏幕移动设备 */
@media (max-width: 480px) {
    .logo h1 {
        font-size: 1rem;
    }
    
    .banner-content h2 {
        font-size: 1.5rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .recommended-content,
    .member-card,
    .article-card,
    .search-form,
    .search-results {
        padding: 1.5rem;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}

/* 会员系统样式 */
.members {
    padding: 2.5rem 0;
    background-color: white;
}

.members-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.member-card {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
}

.member-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.member-card img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: 1.5rem;
    object-fit: cover;
}

.member-card h3 {
    margin-bottom: 0.5rem;
}

.member-card p {
    color: #718096;
    margin-bottom: 0.5rem;
}

/* 文章发布样式 */
.articles {
    padding: 2.5rem 0;
    background-color: white;
}

.articles-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.article-card {
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.article-card h3 {
    margin-bottom: 1rem;
}

.article-card p {
    color: #718096;
    margin-bottom: 1rem;
}

/* 个人主页样式 */
.profile {
    padding: 2.5rem 0;
    background-color: white;
}

.profile-container {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
    background-color: #f7fafc;
    padding: 3rem;
    border-radius: 8px;
}

.profile-img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
}

.profile-info {
    flex: 1;
}

.profile-info h2 {
    margin-bottom: 1.5rem;
}

.profile-info p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* 表单样式 */
.login,
.register,
.publish {
    padding: 2.5rem 0;
    background-color: white;
}

form {
    max-width: 500px;
    margin: 0 auto;
    background-color: #f7fafc;
    padding: 2rem;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #2d3748;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3182ce;
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

button[type="submit"] {
    width: 100%;
    padding: 0.75rem;
    background-color: #0a2463;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button[type="submit"]:hover {
    background-color: #1e3a8a;
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content,
.intro-content,
.research-item,
.news-item {
    animation: fadeIn 0.8s ease-out;
}

.research-item:nth-child(1) { animation-delay: 0.1s; }
.research-item:nth-child(2) { animation-delay: 0.2s; }
.research-item:nth-child(3) { animation-delay: 0.3s; }
.research-item:nth-child(4) { animation-delay: 0.4s; }

.news-item:nth-child(1) { animation-delay: 0.1s; }
.news-item:nth-child(2) { animation-delay: 0.2s; }
.news-item:nth-child(3) { animation-delay: 0.3s; }