/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", "Times New Roman", serif;
}

/* 页面主体样式 */
body {
    background-color: #f8f9fa;
    color: #212529;
    line-height: 1.7;
}

/* 头部：集成Logo + 研究组名称 */
header {
    background-color: #1a5276;
    color: white;
    padding: 1.5rem 2rem;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

/* 河南大学Logo样式 */
.henu-logo {
    height: 80px;
    width: auto;
}

.header-text {
    text-align: left;
}

.lab-name {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.affiliation {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 0.3rem;
}

.lab-desc {
    font-size: 1rem;
    opacity: 0.8;
    max-width: 800px;
    margin: 0 auto;
}

/* Tab 容器 */
.tab-container {
    max-width: 1100px;
    margin: 2.5rem auto;
    padding: 0 2rem;
}

/* Tab 导航栏 */
.tab-nav {
    display: flex;
    flex-wrap: wrap;
    background-color: white;
    border-radius: 10px 10px 0 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    overflow: hidden;
}

.tab-btn {
    padding: 1.2rem 2rem;
    background-color: #f1f5f9;
    border: none;
    cursor: pointer;
    font-size: 1.05rem;
    color: #495057;
    transition: all 0.3s;
    flex: 1;
    text-align: center;
}

.tab-btn:hover {
    background-color: #e8f4fd;
    color: #1a5276;
}

.tab-btn.active {
    background-color: #1a5276;
    color: white;
    font-weight: bold;
}

/* Tab 内容区 */
.tab-content {
    background-color: white;
    padding: 2.5rem;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 3px 12px rgba(0,0,0,0.08);
    display: none;
}

.tab-content.active {
    display: block;
}

/* 通用标题样式 */
.content-title {
    color: #1a5276;
    margin-bottom: 1.2rem;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.8rem;
    font-size: 1.3rem;
}

/* 关于我们内的模块卡片样式（无顶部色条） */
.overview-module {
    background-color: #ffffff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
    margin-bottom: 2rem;
}

/* 模块内标题样式 */
.module-title {
    color: #1a5276;
    margin-bottom: 1rem;
    font-size: 1.3rem;
    border-bottom: 2px solid #e8f4fd;
    padding-bottom: 0.6rem;
}

/* 研究方向样式 */
.research-areas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.area-item {
    padding: 1rem 1.2rem;
    background-color: #e8f4fd;
    border-radius: 6px;
    border-left: 4px solid #1a5276;
}

.area-title {
    font-weight: bold;
    color: #1a5276;
    margin-bottom: 0.5rem;
}

/* 团队成员样式（带照片） */
.members {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.8rem;
    margin-top: 1rem;
}

.member-card {
    padding: 1.2rem;
    border-radius: 8px;
    border: 1px solid #e9ecef;
    text-align: center;
    transition: box-shadow 0.3s;
}

.member-card:hover {
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.member-photo {
    width: 120px;
    height: 150px;
    border-radius: 20%;
    object-fit: cover;
    margin: 0 auto 1rem;
    border: 3px solid #e8f4fd;
    background-color: #f1f5f9;
}

.member-name {
    font-weight: bold;
    color: #1a5276;
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.member-title {
    font-size: 0.95rem;
    color: #6c757d;
    margin-bottom: 0.5rem;
}

.member-research {
    font-size: 0.9rem;
    color: #495057;
    line-height: 1.5;
}

.student-title {
    color: #1a5276;
    margin-top: 2rem;
    margin-bottom: 1.2rem;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.8rem;
    font-size: 1.3rem;
}

.student-members {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    margin-top: 1rem;
}

.student-member-card {
    padding: 1.2rem;
    border-radius: 8px;
    text-align: center;
    transition: box-shadow 0.3s;
}

.student-member-card:hover {
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

/* 研究成果样式：左图右文（图片+文字自适应缩放） */
.achievements {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 1rem;
}

.achievement-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem; /* 减小间距，避免挤压 */
    padding: 1.5rem;
    border-radius: 8px;
    background-color: #f8fafc;
    border-left: 4px solid #1a5276;
    flex-wrap: wrap; /* 确保小屏换行 */
}

/* 成果图片容器：自适应缩放 */
.achievement-img-wrapper {
    /* 核心：自适应宽度，范围更合理 */
    flex: 1 1 clamp(180px, 25%, 280px); 
    aspect-ratio: 1.4 / 1; /* 固定宽高比 280:200 */
    border-radius: 6px;
    /* 关键：防止内容溢出容器 */
    overflow: visible; 
    position: relative;
}

/* 成果图片：完全适配容器 */
.achievement-img {
    width: 100%;
    height: 100%;
    /* 核心：contain 让图片完整显示在容器内 */
    object-fit: contain; 
    object-position: center;
    /* 确保图片不会超出容器 */
    max-width: 100%;
    max-height: 100%;
}

/* 成果文字：自适应缩放 */
.achievement-text {
    /* 占剩余空间，最小宽度更合理 */
    flex: 3 1 clamp(250px, 70%, 100%); 
}

.achievement-title {
    font-weight: bold;
    color: #1a5276;
    /* 字号自适应更平滑 */
    font-size: clamp(1rem, 1.2vw, 1.15rem); 
    margin-bottom: 0.8rem;
}

.achievement-desc {
    line-height: 1.7; /* 减小行高，适配小屏 */
    color: #495057;
    font-size: clamp(0.85rem, 1vw, 0.95rem);
}

/* 论文按年份分类样式 */
.papers {
    margin-top: 1rem;
}

.year-title {
    color: #1a5276;
    font-size: 1.2rem;
    font-weight: bold;
    margin: 2rem 0 1rem 0;
    border-left: 4px solid #3498db;
    padding-left: 0.8rem;
}

.year-title:first-of-type {
    margin-top: 0;
}

.paper-item {
    margin: 1.2rem 0;
    padding: 1rem;
    border-radius: 6px;
    background-color: #f8fafc;
    border-left: 4px solid #1a5276;
}

.paper-title {
    font-weight: bold;
    color: #1a5276;
    margin-bottom: 0.5rem;
}

.paper-authors {
    font-size: 0.95rem;
    color: #495057;
    margin-bottom: 0.3rem;
}

.paper-journal {
    font-size: 0.9rem;
    color: #6c757d;
    font-style: italic;
}

/* 联系方式样式 */
.contact-info {
    line-height: 2;
    margin-top: 1rem;
}

.contact-item {
    margin: 0.8rem 0;
}

.contact-label {
    font-weight: bold;
    color: #1a5276;
    display: inline-block;
    width: 80px;
}

/* 底部 */
footer {
    background-color: #1a5276;
    color: white;
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
    font-size: 0.95rem;
}

/* 响应式适配补充（重点优化小屏） */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1rem;
        padding: 1.5rem 1rem;
    }
    .header-text {
        text-align: center;
    }
    .henu-logo {
        height: 60px;
    }
    .tab-btn {
        padding: 1rem 1.2rem;
        font-size: 0.95rem;
    }
    .tab-content {
        padding: 1.5rem 1rem; /* 减小内边距，给图片更多空间 */
    }
    .research-areas {
        grid-template-columns: 1fr;
    }
    .overview-module {
        padding: 1.5rem;
    }
    .member-photo {
        width: 100px;
        height: 100px;
    }
    /* 移动端成果项优化 */
    .achievement-item {
        gap: 1rem;
        padding: 1rem;
    }
    /* 移动端图片容器宽度100%，高度自适应 */
    .achievement-img-wrapper {
        flex: 1 1 100%;
        aspect-ratio: 1.8 / 1; /* 移动端调整宽高比，更适配手机 */
    }
}

/* 针对平板的适配（768-992px） */
@media (min-width: 769px) and (max-width: 992px) {
    .achievement-img-wrapper {
        flex: 1 1 clamp(160px, 30%, 250px);
    }
    .achievement-text {
        flex: 2 1 clamp(220px, 65%, 100%);
    }
}