.mapparent {
    display: flex;
    justify-content: center; /* 水平居中 */
    align-items: center; /* 垂直居中 */
    }
    .mapchild {
    width: 90%;
    height: 450px;
    background-color: lightblue;
    }
    /* ===== Hero 区域 ===== */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding: 6rem 2rem 4rem;
      background: linear-gradient(135deg, #f0f4f8 0%, #e6eff5 100%);
      position: relative;
      overflow: hidden;
    }
    
    .hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(26,58,92,0.08) 0%, transparent 70%);
      border-radius: 50%;
      z-index: 0;
    }
    
    .hero-content {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      align-items: center;
      position: relative;
      z-index: 1;
    }
    
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      margin-bottom: 1rem;
      line-height: 1.2;
      color: var(--bmw-blue);
    }
    
    .hero-text .subtitle {
      font-size: 1.25rem;
      color: var(--bmw-blue);
      font-weight: 500;
      margin-bottom: 1.5rem;
    }
    
    .hero-text p {
      color: var(--bmw-gray);
      margin-bottom: 2rem;
      font-size: 1.1rem;
    }
    
    .hero-cta {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
        /* ===== 基础重置与变量 ===== #2e5a7a  */
    :root {
      --bmw-blue: #1a3a5c;
      --bmw-blue-new: #0066ff;
      --bmw-blue-light: #0052cc;
      --bmw-gray: #666;
      --bmw-light: #f8f9fa;
      --bmw-white: #ffffff;
      --bmw-dark: #1a1a1a;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
      --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
      --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --color-bg-alt: #f8f9fa;
      --color-text-secondary: #666666;
      --color-border: #e5e5e5;
    }
    
    * { margin: 0; padding: 0; box-sizing: border-box; }
    
    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
      line-height: 1.6;
      color: var(--bmw-dark);
      background: var(--bmw-white);
      -webkit-font-smoothing: antialiased;
    }
    
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    ul { list-style: none; }
    img { max-width: 100%; display: block; }
    
    /* ===== 导航栏 ===== */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      z-index: 1000;
      box-shadow: var(--shadow-sm);
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    
    .logo {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--bmw-blue);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    
    .logo::before {
      content: '';
      width: 1px; height: 1px;
      background: linear-gradient(135deg, var(--bmw-blue), var(--bmw-blue-light));
      border-radius: 50%;
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--bmw-gray);
      position: relative;
      padding: 0.5rem 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--bmw-blue);
      transition: var(--transition);
    }
    
    .nav-links a:hover { color: var(--bmw-blue); }
    .nav-links a:hover::after { width: 100%; }
    
    .mobile-toggle { display: none; font-size: 1.5rem; cursor: pointer; }
  
    
    .btn {
      padding: 0.875rem 2rem;
      border-radius: 50px;
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: var(--transition);
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }
    
    .btn-primary {
      background: var(--bmw-blue-new);
      color: white;
      box-shadow: 0 4px 14px rgba(26,58,92,0.3);
    }
    
    .btn-primary:hover {
      background: var(--bmw-blue-light);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(26,58,92,0.4);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--bmw-blue);
      border: 2px solid var(--bmw-blue);
    }
    
    .btn-outline:hover {
      background: var(--bmw-blue);
      color: white;
    }
    
    .hero-image {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    
    .profile-card {
      background: white;
      border-radius: var(--radius);
      padding: 2rem;
      box-shadow: var(--shadow-lg);
      max-width: 400px;
      text-align: center;
      transition: var(--transition);
    }
    
    .profile-card:hover { transform: translateY(-8px); }
    
    .avatar {
      width: 180px;
      height: 180px;
      border-radius: 50%;
      margin: 0 auto 1.5rem;
      background: linear-gradient(135deg, var(--bmw-blue), var(--bmw-blue-light));
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 3rem;
      font-weight: 600;
      box-shadow: 0 8px 25px rgba(26,58,92,0.25);
    }
    
    .profile-info h3 {
      font-size: 1.5rem;
      margin-bottom: 0.5rem;
    }
    
    .profile-info .title {
      color: var(--bmw-blue);
      font-weight: 500;
      margin-bottom: 1rem;
      display: block;
    }
    
    .social-links {
      display: flex;
      justify-content: center;
      gap: 1rem;
      margin-top: 1rem;
    }
    
    .social-links a {
      width: 80px;
      height: 40px;
      border-radius: 50%;
      background: var(--bmw-light);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--bmw-blue);
      font-weight: 600;
      transition: var(--transition);
    }
    
    .social-links a:hover {
      background: var(--bmw-blue);
      color: white;
      transform: translateY(-3px);
    }
    
    /* ===== 内容模块通用样式 ===== */
    .section {
      padding: 5rem 2rem;
      max-width: 1200px;
      margin: 0 auto;
    }
    
    .section-header {
      text-align: center;
      margin-bottom: 3rem;
    }
    
    .section-header h2 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--bmw-dark);
      margin-bottom: 0.75rem;
    }
    
    .section-header h3 {
      margin-bottom: 1rem;
      color: var(--bmw-blue-new);
    }
    
    .section-header p {
      color: var(--bmw-gray);
      max-width: 600px;
      margin: 0 auto;
    }
    
    /* ===== 卡片网格 ===== */
    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 1.5rem;
    }
    
    .card {
      background: white;
      border-radius: var(--radius);
      padding: 1.75rem;
      box-shadow: var(--shadow-md);
      transition: var(--transition);
      border: 1px solid rgba(0,0,0,0.05);
    }
    
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(26,58,92,0.2);
    }
    
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, var(--bmw-blue), var(--bmw-blue-light));
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 600;
      margin-bottom: 1rem;
    }
    
    .card h3 {
      font-size: 1.25rem;
      margin-bottom: 0.75rem;
      color: var(--bmw-blue-new);
    }
    
    .card p {
      color: var(--bmw-gray);
      font-size: 0.95rem;
      margin-bottom: 1rem;
    }
    
    .card-link {
      color: var(--bmw-blue);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
      font-size: 0.9rem;
    }
    
    .card-link:hover { gap: 0.5rem; }
    
    /* ===== 时间线（教育/经历） ===== */
    .timeline {
      position: relative;
      padding-left: 2rem;
    }
    
    .timeline::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, var(--bmw-blue), transparent);
    }
    
    .timeline-item {
      position: relative;
      padding-bottom: 2rem;
      padding-left: 1.5rem;
    }
    
    .timeline-item::before {
      content: '';
      position: absolute;
      left: -2.4rem;
      top: 4px;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: var(--bmw-blue);
      border: 3px solid white;
      box-shadow: 0 0 0 2px var(--bmw-blue);
    }
    
    .timeline-item .date {
      color: var(--bmw-blue-new);
      font-weight: 600;
      font-size: 0.9rem;
      margin-bottom: 0.25rem;
    }
    
    .timeline-item h4 {
      font-size: 1.1rem;
      margin-bottom: 0.25rem;
    }
    
    .timeline-item .org {
      color: var(--bmw-gray);
      font-size: 0.95rem;
    }
    
    /* ===== 论文列表 ===== */
    .paper-item {
      display: flex;
      gap: 1rem;
      padding: 1.25rem;
      border-radius: var(--radius);
      background: var(--bmw-light);
      margin-bottom: 1rem;
      transition: var(--transition);
    }
    
    .paper-item:hover {
      background: white;
      box-shadow: var(--shadow-md);
      transform: translateX(4px);
    }
    
    .paper-index {
      min-width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--bmw-blue);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.85rem;
      font-weight: 600;
      flex-shrink: 0;
    }
    
    .paper-content h4 {
      font-size: 1rem;
      margin-bottom: 0.5rem;
      line-height: 1.4;
    }
    
    .paper-meta {
      font-size: 0.85rem;
      color: var(--bmw-gray);
      margin-bottom: 0.5rem;
    }
    
    .paper-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    
    .tag {
      padding: 0.25rem 0.75rem;
      background: white;
      border-radius: 20px;
      font-size: 0.75rem;
      color: var(--bmw-blue);
      font-weight: 500;
      border: 1px solid rgba(26,58,92,0.15);
    }
    
    /* ===== 资源链接 ===== */
    .resource-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
      gap: 1rem;
    }
    
    .resource-item {
      text-align: center;
      padding: 1.5rem 1rem;
      border-radius: var(--radius);
      background: var(--bmw-light);
      transition: var(--transition);
      cursor: pointer;
    }
    
    .resource-item:hover {
      background: var(--bmw-blue);
      color: white;
      transform: translateY(-3px);
    }
    
    .resource-item:hover .resource-icon {
      background: rgba(255,255,255,0.2);
    }
    
    .resource-icon {
      width: 48px;
      height: 48px;
      margin: 0 auto 0.75rem;
      border-radius: 12px;
      background: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      color: var(--bmw-blue);
      transition: var(--transition);
    }
    
    .resource-item span {
      font-size: 0.9rem;
      font-weight: 500;
    }
    
    /* ===== 联系区域 ===== */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      text-align: center;
      margin-bottom: 3rem;
    }
    
    .contact-wrapper {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 3rem;
      align-items: center;
    }
    .contact-info p {
      margin-bottom: 1rem;
      font-size: 1.1rem;
      text-align: center;
    }
    .social-links {
      display: flex;
      gap: 1rem;
      margin-top: 1.5rem;
    }
    .social-links a {
      padding: 0.75rem 1.5rem;
      background: var(--color-bg-alt);
      border-radius: 20px;
      text-decoration: none;
      color: var(--color-text);
      transition: var(--transition);
    }
    .social-links a:hover {
      background: var(--color-primary);
      color: white;
    }
    .contact-qr {
      display: flex;
      gap: 2rem;
      justify-content: center;
    }
    /* 每个图片-文字组合的列 */
    .item {
        display: flex;
        flex-direction: column; /* 垂直排列：图片在上，文字在下 */
        align-items: center;    /* 水平居中 */
        text-align: center;
    }
    /* 图片样式 */
    .item img {
        width: 150px;
        height: 150px;
        object-fit: cover;
        border: 2px dashed var(--color-border);
        border-radius: var(--radius);
        margin-bottom: 10px; /* 图片与文字的间距 */
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        background: var(--color-bg-alt);
    }

    /* 文字样式 */
    .item .caption {
        font-size: 0.9rem;
        color: var(--color-text-secondary);
        line-height: 1.5;
        max-width: 150px; /* 限制文字宽度与图片一致 */
    }
    
    /* ===== 页脚 ===== */
    .footer {
      background: var(--bmw-dark);
      color: rgba(255,255,255,0.8);
      padding: 3rem 2rem;
      text-align: center;
    }
    
    .footer-content {
      max-width: 1200px;
      margin: 0 auto;
    }
    
    .footer-links {
      display: flex;
      justify-content: center;
      gap: 2rem;
      margin-bottom: 1.5rem;
      flex-wrap: wrap;
    }
    
    .footer-links a:hover { color: white; }
    
    .footer-copyright {
      font-size: 0.9rem;
      opacity: 0.7;
    }
    
    /* ===== 响应式适配 ===== */
    @media (max-width: 968px) {
      .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
      }
      
      .hero-text h1 { font-size: 2.5rem; }
      .hero-cta { justify-content: center; }
      .profile-card { margin: 0 auto; }
      
      .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1.5rem;
        gap: 1rem;
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        transition: var(--transition);
      }
      
      .nav-links.active { transform: translateY(0); }
      .mobile-toggle { display: block; }
    }
    
    @media (max-width: 480px) {
      .hero-text h1 { font-size: 2rem; }
      .section { padding: 3rem 1.5rem; }
      .grid { grid-template-columns: 1fr; }
    }
    
    /* ===== 平滑滚动 ===== */
    html { scroll-behavior: smooth; }
    
    /* ===== 加载动画 ===== */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    
    .animate {
      animation: fadeInUp 0.6s ease forwards;
    }
    
    .animate-delay-1 { animation-delay: 0.1s; }
    .animate-delay-2 { animation-delay: 0.2s; }
    .animate-delay-3 { animation-delay: 0.3s; }