/* 主要样式文件 - 参考清华大学风格 */

/* 变量定义 */
:root {
    /* 主色调 */
    --primary-blue: #003366; /* 深蓝色 - 主色 */
    --secondary-gold: #D4AF37; /* 金色 - 辅助色 */
    --accent-red: #990000; /* 红色 - 强调色 */
    
    /* 中性色 */
    --neutral-dark: #333333;
    --neutral-medium: #666666;
    --neutral-light: #CCCCCC;
    --neutral-bg: #F5F5F5;
    
    /* 字体 */
    --font-primary: 'Noto Sans', 'Microsoft YaHei', sans-serif;
    --font-secondary: 'Noto Serif', 'SimSun', serif;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 边框 */
    --border-radius: 4px;
    --border-width: 1px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--neutral-dark);
    line-height: 1.6;
    background-color: #fff;
}

a {
    text-decoration: none;
    color: var(--primary-blue);
    transition: color 0.3s ease;
}

a:hover {
    color: var(--secondary-gold);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 20px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn.primary {
    background-color: var(--primary-blue);
    color: white;
    border: 2px solid var(--primary-blue);
}

.btn.primary:hover {
    background-color: #00264d;
    border-color: #00264d;
}

.btn.secondary {
    background-color: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn.secondary:hover {
    background-color: rgba(0, 51, 102, 0.1);
}

/* 标题样式 */
.section-title {
    font-family: var(--font-secondary);
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-sm);
    text-align: center;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--secondary-gold);
}

/* 头部导航栏 */
.header {
    background-color: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--secondary-gold);
}

.header .container {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding: var(--spacing-sm) 0 var(--spacing-sm) 0;
    gap: 0.5rem;
}

.logo-container {
    display: flex;
    align-items: center;
    margin-left: 0;
    margin-right: var(--spacing-sm);
}

.logo {
    height: 60px;
    margin-right: var(--spacing-sm);
    margin-left: 0;
}

.logo-text h1 {
    font-size: 1.2rem;
    color: var(--primary-blue);
    margin: 0;
}

.logo-text p {
    font-size: 0.8rem;
    color: var(--neutral-medium);
}

.main-nav ul {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.main-nav li {
    margin: 0 var(--spacing-xs);
}

.main-nav a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--neutral-dark);
    font-weight: 500;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--secondary-gold);
    transition: width 0.3s ease;
}

.main-nav a:hover {
    color: var(--primary-blue);
}

.main-nav a:hover::after {
    width: 100%;
}

.language-selector select {
    padding: 0.5rem;
    border: 1px solid var(--neutral-light);
    border-radius: var(--border-radius);
    background-color: white;
    color: var(--neutral-dark);
    cursor: pointer;
}

/* 主视觉区域 */
.hero {
    position: relative;
    height: 600px;
    overflow: hidden;
}

.hero-slider {
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease;
    display: flex;
    align-items: center;
}

.slide.active {
    opacity: 1;
    z-index: 1;
}

.slide img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
    filter: brightness(0.7);
}

.slide-content {
    color: white;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    text-align: center;
    position: relative;
    z-index: 2;
}

.slide-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.slide-content p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.slider-controls {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.prev, .next {
    background: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background 0.3s ease;
}

.prev:hover, .next:hover {
    background: rgba(0, 0, 0, 0.8);
}

.dots {
    display: flex;
    margin: 0 var(--spacing-md);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    margin: 0 5px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.dot.active {
    background: white;
}

/* 新闻公告区域 */
.news-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--neutral-bg);
}

.news-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.featured-news {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.news-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.news-tag.important {
    background-color: var(--accent-red);
    color: white;
}

.featured-news h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-blue);
}

.read-more {
    display: inline-flex;
    align-items: center;
    margin-top: var(--spacing-md);
    font-weight: 600;
    color: var(--primary-blue);
}

.read-more i {
    margin-left: var(--spacing-xs);
    transition: transform 0.3s ease;
}

.read-more:hover i {
    transform: translateX(5px);
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.news-item {
    background-color: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.news-date {
    font-size: 0.8rem;
    color: var(--neutral-medium);
    margin-bottom: var(--spacing-xs);
}

.news-item h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-blue);
}

.view-all {
    display: block;
    text-align: center;
    font-weight: 600;
    color: var(--primary-blue);
}

/* 焦点区域 */
.spotlight-section {
    padding: var(--spacing-xl) 0;
}

.spotlight-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.video-container {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.video-placeholder {
    width: 100%;
    display: block;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background-color: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.play-button i {
    color: white;
    font-size: 2rem;
}

.play-button:hover {
    background-color: var(--primary-blue);
}

.video-feature h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-blue);
}

.stats-dashboard {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.stat-card {
    background-color: var(--primary-blue);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--secondary-gold) !important;
}

.stat-description {
    font-size: 0.9rem;
}

/* 产业合作伙伴 */
.industry-partners {
    padding: var(--spacing-xl) 0;
    background-color: var(--neutral-bg);
}

.partners-slider {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.partner {
    flex: 0 0 calc(16.666% - var(--spacing-lg));
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
}

.partner:hover {
    transform: translateY(-5px);
}

.partner img {
    max-width: 100%;
    max-height: 80px;
    filter: grayscale(100%);
    transition: filter 0.3s ease;
}

.partner:hover img {
    filter: grayscale(0%);
}

/* 快速链接 */
.quick-links {
    padding: var(--spacing-xl) 0;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

/* 页面横幅 */
.page-banner {
    background-color: var(--primary-blue);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.page-banner h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.page-banner p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
}

.international-banner {
    background-image: linear-gradient(rgba(0, 51, 102, 0.8), rgba(0, 51, 102, 0.8)), url('../images/international-banner.jpg');
    background-size: cover;
    background-position: center;
}

/* 学术项目导航 */
.program-navigation {
    background-color: var(--neutral-bg);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--neutral-light);
}

.program-nav-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.program-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.program-tab.active {
    color: var(--primary-blue);
    border-bottom-color: var(--secondary-gold);
}

.program-tab:hover {
    color: var(--primary-blue);
}

/* 学术项目内容 */
.programs-content {
    padding: var(--spacing-xl) 0;
}

.program-category {
    display: none;
}

.program-category.active {
    display: block;
}

.program-intro {
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
    font-size: 1.1rem;
    color: var(--neutral-medium);
}

.programs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.program-card {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.program-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.program-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.program-details {
    padding: var(--spacing-md);
}

.program-details h3 {
    font-size: 1.3rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.duration {
    color: var(--neutral-medium);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
}

.duration i {
    margin-right: var(--spacing-xs);
}

.program-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.program-features span {
    background-color: var(--neutral-bg);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
}

.program-features span i {
    margin-right: var(--spacing-xs);
    color: var(--secondary-gold);
}

.quick-link-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background-color: white;
    border: 1px solid var(--neutral-light);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    text-align: center;
}

.quick-link-card i {
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
}

.quick-link-card h3 {
    font-size: 1.1rem;
    color: var(--neutral-dark);
}

.quick-link-card:hover {
    transform: translateY(-5px);
    border-color: var(--secondary-gold);
    box-shadow: var(--shadow-md);
}

.quick-link-card:hover i {
    color: var(--secondary-gold);
}

/* 学术支持服务 */
.academic-support {
    padding: var(--spacing-xl) 0;
    background-color: var(--neutral-bg);
}

.support-services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.support-service-card {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
}

.support-service-card:hover {
    transform: translateY(-5px);
}

.support-service-card i {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
}

.support-service-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-blue);
}

/* FAQ部分 */
.faq-section {
    padding: var(--spacing-xl) 0;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--neutral-light);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.faq-question {
    padding: var(--spacing-md);
    background-color: white;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question h3 {
    font-size: 1.1rem;
    margin: 0;
    color: var(--primary-blue);
}

.faq-question i {
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 var(--spacing-md);
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    background-color: var(--neutral-bg);
}

.faq-item.active .faq-answer {
    padding: var(--spacing-md);
    max-height: 500px;
}

/* 国际合作页面样式 */
.international-overview {
    padding: var(--spacing-xl) 0;
}

.overview-content {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.overview-text p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.key-stats {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-lg);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--neutral-medium);
}

.overview-image img {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

/* 合作伙伴地图 */
.partners-map-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--neutral-bg);
}

.world-map-container {
    position: relative;
    margin: var(--spacing-lg) 0;
}

.world-map {
    width: 100%;
    height: auto;
}

.map-marker {
    position: absolute;
    width: 30px;
    height: 30px;
    transition: opacity 0.3s ease;
}

.marker-dot {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 12px;
    background-color: var(--secondary-gold);
    border-radius: 50%;
    z-index: 2;
}

.marker-pulse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    background-color: rgba(212, 175, 55, 0.4);
    border-radius: 50%;
    z-index: 1;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.5);
        opacity: 0;
    }
}

.regions-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.region-item {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.region-item.active {
    border-color: var(--secondary-gold);
    background-color: var(--primary-blue);
    color: white;
}

.region-item:hover {
    transform: translateY(-3px);
}

/* 国际项目选项卡 */
.programs-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.program-panel {
    display: none;
}

.program-panel.active {
    display: block;
}

.program-panel-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.panel-image img {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.panel-details h3 {
    font-size: 1.5rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
}

.panel-details h4 {
    font-size: 1.1rem;
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.feature-list {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.feature-list li {
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
}

.feature-list li i {
    color: var(--secondary-gold);
    margin-right: var(--spacing-sm);
}

.program-cta {
    display: flex;
    gap: var(--spacing-md);
}

/* 特色合作伙伴 */
.featured-partners {
    padding: var(--spacing-xl) 0;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.partner-card {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
}

.partner-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.partner-logo {
    height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--neutral-bg);
}

.partner-logo img {
    max-height: 80px;
    max-width: 80%;
}

.partner-details {
    padding: var(--spacing-md);
}

.partner-details h3 {
    font-size: 1.2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.partner-location {
    font-size: 0.9rem;
    color: var(--neutral-medium);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
}

.partner-location i {
    margin-right: var(--spacing-xs);
}

.partnership-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.partnership-highlights span {
    background-color: var(--neutral-bg);
    padding: 0.25rem 0.5rem;
    border-radius: 20px;
    font-size: 0.75rem;
}

.view-all-partners {
    text-align: center;
}

/* 国际学生信息 */
.international-students {
    padding: var(--spacing-xl) 0;
    background-color: var(--neutral-bg);
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.info-card {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 70px;
    height: 70px;
    background-color: var(--primary-blue);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto var(--spacing-md);
}

.card-icon i {
    font-size: 1.8rem;
}

.info-card h3 {
    font-size: 1.2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.card-link {
    display: inline-flex;
    align-items: center;
    margin-top: var(--spacing-md);
    font-weight: 600;
    color: var(--primary-blue);
}

.card-link i {
    margin-left: var(--spacing-xs);
    transition: transform 0.3s ease;
}

.card-link:hover i {
    transform: translateX(5px);
}

/* 联系部分 */
.contact-section {
    padding: var(--spacing-xl) 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.contact-item {
    display: flex;
    margin-bottom: var(--spacing-lg);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-blue);
    margin-right: var(--spacing-md);
    min-width: 30px;
}

.contact-item h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-blue);
}

.contact-form h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-blue);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--neutral-light);
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
}

.form-group textarea {
    resize: vertical;
}

/* 页脚 */
.footer {
    background-color: var(--primary-blue);
    color: white;
    padding-top: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    height: 60px;
    margin-bottom: var(--spacing-md);
}

.footer-contact address {
    font-style: normal;
    line-height: 1.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.footer-links-column h3 {
    color: var(--secondary-gold);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.footer-links-column ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-links-column a {
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.3s ease;
}

.footer-links-column a:hover {
    color: var(--secondary-gold);
}

.footer-bottom {
    padding: var(--spacing-lg) 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.accreditation {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.accreditation img {
    height: 40px;
}

.social-media {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.social-media a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    transition: all 0.3s ease;
}

.social-media a:hover {
    background-color: var(--secondary-gold);
    transform: translateY(-3px);
}

.copyright {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
}

/* AI招生助手 */
.ai-assistant-widget {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
}

.ai-toggle {
    display: flex;
    align-items: center;
    background-color: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 30px;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.ai-toggle i {
    margin-right: var(--spacing-sm);
    font-size: 1.2rem;
}

.ai-toggle:hover {
    background-color: var(--secondary-gold);
    transform: translateY(-3px);
}

.ai-chat-container {
    position: absolute;
    bottom: 70px;
    right: 0;
    width: 350px;
    background-color: white;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.ai-chat-container.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.ai-chat-header {
    background-color: var(--primary-blue);
    color: white;
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ai-chat-header h3 {
    margin: 0;
    font-size: 1rem;
}

.close-chat {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1rem;
}

.ai-chat-messages {
    height: 300px;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.ai-message {
    display: flex;
    margin-bottom: var(--spacing-md);
}

.ai-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    overflow: hidden;
    margin-right: var(--spacing-sm);
    flex-shrink: 0;
}

.ai-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.message-content {
    background-color: var(--neutral-bg);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 18px;
    max-width: 80%;
}

.ai-chat-input {
    display: flex;
    padding: var(--spacing-md);
    border-top: 1px solid var(--neutral-light);
}

.ai-chat-input input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--neutral-light);
    border-radius: 20px;
    margin-right: var(--spacing-sm);
}

.send-message {
    background-color: var(--primary-blue);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.send-message:hover {
    background-color: var(--secondary-gold);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .spotlight-content,
    .news-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .partner {
        flex: 0 0 calc(33.333% - var(--spacing-lg));
    }
}

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        padding: var(--spacing-md);
    }
    
    .logo-container {
        margin-bottom: var(--spacing-md);
    }
    
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .language-selector {
        margin-top: var(--spacing-md);
    }
    
    .hero {
        height: 500px;
    }
    
    .slide-content h2 {
        font-size: 2rem;
    }
    
    .slide-content p {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        margin-bottom: var(--spacing-sm);
        width: 100%;
        max-width: 250px;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .partner {
        flex: 0 0 calc(50% - var(--spacing-lg));
    }
    
    .stats-dashboard {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 1.5rem;
    }
    
    .hero {
        height: 400px;
    }
    
    .slide-content h2 {
        font-size: 1.5rem;
    }
    
    .partner {
        flex: 0 0 100%;
    }
    
    .ai-chat-container {
        width: 300px;
    }
}