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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

a {
    text-decoration: none;
    color: #0056b3;
}

ul {
    list-style: none;
}

/* 头部样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo h1 {
    font-size: 1.5rem;
    color: #0056b3;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
    padding: 5px 10px;
    border-radius: 4px;
}

nav ul li a:hover {
    color: #0056b3;
}

nav ul li a.active {
    color: #fff;
    background-color: #0056b3;
}

/* 主要内容区域 */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, rgba(0,86,179,0.8), rgba(0,160,233,0.8));
    color: white;
    padding: 4rem 2rem;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* background-image: url('../images/logo.png'); */
    background-size: 250px auto;
    background-position: center;
    background-repeat: space;
    opacity: 0.3;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    padding: 1rem;
    z-index: 1;
}

.hero-content h1::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* background-image: url('../images/logo.png'); */
    background-size: 300px auto;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.25;
    z-index: -1;
    border-radius: 8px;
}

.hero-content h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-weight: 400;
}

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

/* 介绍部分 */
.intro-section {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.intro-section h2 {
    color: #0056b3;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.intro-section h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.intro-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
    text-align: justify;
}

/* 赞助商部分 */
.sponsors {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
    text-align: center;
}

.sponsors h2 {
    color: #0056b3;
    margin-bottom: 1.5rem;
}

.sponsor-logos {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.sponsor-logo {
    padding: 1rem 2rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    font-weight: bold;
}

/* 联系方式部分 */
.contact {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.contact h2 {
    color: #0056b3;
    margin-bottom: 1.5rem;
    text-align: center;
}

.contact-info {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.contact-person {
    text-align: center;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    min-width: 250px;
}

.contact-person h3 {
    margin-bottom: 0.5rem;
}

/* 页脚样式 */
footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        padding: 1rem;
    }
    
    nav ul {
        margin-top: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 0.5rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content h2 {
        font-size: 1.5rem;
    }
    
    .contact-info {
        flex-direction: column;
        align-items: center;
    }
}

/* 挑战页面样式 */
.challenge-section {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.challenge-section h2 {
    color: #0056b3;
    margin-bottom: 1rem;
}

.challenge-overview {
    margin-bottom: 2rem;
}

.challenge-overview p {
    font-size: 1.1rem;
    line-height: 1.8;
    text-align: justify;
}

.challenge-tracks {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.challenge-track {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.challenge-track h3 {
    color: #0056b3;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    border-bottom: 2px solid #0056b3;
    padding-bottom: 0.5rem;
}

.challenge-track h4 {
    color: #333;
    margin: 1.2rem 0 0.8rem 0;
    font-size: 1.2rem;
}

.challenge-track h5 {
    color: #0056b3;
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

.challenge-track p {
    margin-bottom: 1rem;
    line-height: 1.7;
    text-align: justify;
}

.challenge-track ul {
    margin-left: 1.5rem;
    list-style-type: disc;
    margin-bottom: 1rem;
}

.challenge-track li {
    margin-bottom: 0.5rem;
}

.challenge-track li ul {
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}

.multi-factor-category {
    background-color: white;
    padding: 1.2rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.multi-factor-category h4 {
    color: #0056b3;
    margin-bottom: 0.8rem;
    font-size: 1.2rem;
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 0.5rem;
}

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

.challenge-topic {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.challenge-topic h3 {
    color: #0056b3;
    margin-bottom: 1rem;
}

.challenge-topic ul {
    margin-left: 1.5rem;
    list-style-type: disc;
}

.challenge-topic li {
    margin-bottom: 0.5rem;
}

.challenge-dates {
    margin-top: 2rem;
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
}

.challenge-dates h3 {
    color: #0056b3;
    margin-bottom: 1rem;
}

.challenge-dates ul {
    margin-left: 1.5rem;
    list-style-type: disc;
}

/* 竞赛赛道容器样式 */
.challenge-tracks {
    display: block;
    margin-top: 2rem;
}

.track-section {
    margin-bottom: 1.2rem;
}

.track-section h4, .evaluation-metrics h4 {
    color: #0056b3;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    border-bottom: 2px solid #0056b3;
    padding-bottom: 0.5rem;
}

.evaluation-metrics {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    margin: 0.8rem 0 1.2rem 0;
}

.evaluation-metrics ul {
    margin-left: 1.5rem;
    list-style-type: disc;
    margin-bottom: 0.5rem;
}

.evaluation-metrics li {
    margin-bottom: 0.8rem;
    line-height: 1.5;
}

/* 数据集页面样式 */
.dataset-section {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.dataset-section h2 {
    color: #0056b3;
    margin-bottom: 1rem;
}

.dataset-section p, .dataset-description p, .dataset-section li, .dataset-description li {
    text-align: justify;
    line-height: 1.8;
}

/* 子标题列表样式 */
.dataset-section ul ul li {
    position: relative;
    font-size: 0.95rem;
    margin-left: 0.5rem;
    padding-left: 1.5rem;
}

.dataset-section ul ul li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: #0056b3;
    font-weight: bold;
}

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

.dataset-example {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.dataset-example img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.dataset-example p {
    font-style: italic;
    margin-bottom: 0.5rem;
}

/* Call for Papers页面样式 */
.call-for-papers-section {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.call-for-papers-section h2 {
    color: #0056b3;
    margin-bottom: 1rem;
}

.call-for-papers-section p {
    text-align: justify;
    line-height: 1.8;
}

.call-for-papers-section h3 {
    color: #0056b3;
    margin: 1.5rem 0 1rem 0;
    font-size: 1.4rem;
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 0.5rem;
}

.call-for-papers-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.call-for-papers-content ul {
    margin-left: 1.5rem;
    list-style-type: disc;
    margin-bottom: 1rem;
    columns: 2;
}

.call-for-papers-content li {
    margin-bottom: 0.8rem;
    line-height: 1.5;
}

@media (max-width: 768px) {
    .call-for-papers-content ul {
        columns: 1;
    }
}

/* 研讨会页面样式 */
.workshop-section {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.workshop-section h2 {
    color: #0056b3;
    margin-bottom: 1rem;
}

.workshop-schedule {
    margin-top: 2rem;
}

.workshop-session {
    margin-bottom: 2rem;
}

.workshop-session h3 {
    background-color: #0056b3;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.workshop-session table {
    width: 100%;
    border-collapse: collapse;
}

.workshop-session th, .workshop-session td {
    padding: 0.75rem;
    border-bottom: 1px solid #ddd;
    text-align: left;
}

.workshop-session th {
    background-color: #f8f9fa;
}

/* 人员页面样式 */
.people-section {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.people-section h2 {
    color: #0056b3;
    margin-bottom: 1rem;
}

/* 竞赛概览部分 */
.competition-section {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.competition-section h2 {
    color: #0056b3;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.competition-section h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.competition-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.2rem;
    margin-top: 2rem;
}

.person-card {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    text-align: center;
}

.person-card img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 0.6rem;
}

.person-card h3 {
    margin-bottom: 0.3rem;
    font-size: 1rem;
}

.person-card p {
    color: #666;
    font-size: 0.8rem;
    margin-bottom: 0.2rem;
    line-height: 1.3;
}

/* 单因子挑战视频展示样式 */
.single-factor-videos {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    margin: 0.8rem 0;
}
唵
.single-factor-videos h4 {
    color: #0056b3;
    margin-bottom: 0.5rem;
    font-size: 1.4rem;
    font-weight: bold;
}

.single-factor-videos p {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.video-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.video-item {
    background-color: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.video-item h5 {
    color: #0056b3;
    margin-bottom: 0.8rem;
    text-align: center;
}

.video-item video {
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* 多因子图片展示样式 - 与单因子视频展示保持一致 */
.multi-factor-images {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    margin: 0.8rem 0;
}

.multi-factor-images h4 {
    color: #0056b3;
    margin-bottom: 0.5rem;
    font-size: 1.4rem;
    font-weight: bold;
}

.multi-factor-images p {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.image-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.image-item {
    background-color: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.image-item h5 {
    color: #0056b3;
    margin-bottom: 0.8rem;
    text-align: center;
}

.image-item img {
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    width: 100%;
    height: auto;
}

/* 响应式容器 */
@media (max-width: 768px) {
    .video-container,
    .image-container {
        grid-template-columns: 1fr;
    }
}

/* 数据集下载按钮 */
.download-btn {
    display: inline-block;
    background-color: #0056b3;
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: bold;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 15px 0;
    text-align: center;
}

.download-btn:hover {
    background-color: #003d82;
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
    color: white;
}

.download-btn i {
    margin-left: 8px;
}

/* 数据集下载区域样式 */
.dataset-download {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
    text-align: center;
}

.dataset-download h3 {
    color: #0056b3;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.dataset-download p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

/* 奖励信息区域样式 */
.prize-info {
    background-color: #f0f7ff;
    border: 2px solid #0056b3;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.prize-info h4 {
    color: #0056b3;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    text-align: center;
    border-bottom: 1px solid #0056b3;
    padding-bottom: 0.5rem;
}

.prize-info ul {
    list-style-type: none;
    padding-left: 0;
    margin-bottom: 1.2rem;
}

.prize-info li {
    padding: 0.5rem 0;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    text-align: center;
}

.prize-info p {
    text-align: center;
    font-style: italic;
    color: #333;
    margin-bottom: 0;
    font-size: 1rem;
    line-height: 1.5;
}