:root {
      --navy: #0E1628;
      --gold: #C9A24A;
      --sand: #F5EFE3;
      --cream: #FAF8F3;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: 'DM Sans', sans-serif;
      background: var(--sand);
      color: var(--navy);
      line-height: 1.6;
    }
    
    h1, h2, h3, h4 {
      font-family: 'Playfair Display', serif;
    }
    
    /* Navigation - 深色背景，使用白色Logo */
    .nav {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      background: rgba(14, 22, 40, 0.6);
      backdrop-filter: blur(8px);
    }
    
    .nav-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .logo img {
      height: 80px;
      width: auto;
      display: block;
      filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.4)) drop-shadow(0 0 16px rgba(255, 255, 0.2));
      mix-blend-mode: screen;
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
    }
    
    .nav-links a {
      text-decoration: none;
      color: rgba(255, 255, 255, 0.9);
      font-size: 0.9rem;
      font-weight: 500;
      transition: color 0.3s;
    }
    
    .nav-links a:hover {
      color: var(--gold);
    }
    
    .nav-cta {
      background: var(--gold);
      color: var(--navy);
      padding: 0.5rem 1.25rem;
      border-radius: 4px;
      text-decoration: none;
      font-size: 0.85rem;
      font-weight: 600;
      transition: all 0.3s;
    }
    
    .nav-cta:hover {
      background: rgba(201, 162, 74, 0.9);
    }
    
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      background: url('../images/hero-bg.jpg') center center / cover no-repeat;
    }
    
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(14, 22, 40, 0.5);
    }
    
    .hero-content {
      position: relative;
      z-index: 1;
      text-align: center;
      padding: 2rem;
      margin-top: 60px;
    }
    
    .hero-english {
      font-family: 'Playfair Display', serif;
      font-size: clamp(1rem, 2.5vw, 1.5rem);
      color: var(--gold);
      font-style: italic;
      letter-spacing: 0.15em;
      margin-bottom: 2rem;
      opacity: 0.9;
    }
    
    .hero-keywords {
      font-family: 'Playfair Display', serif;
      font-size: clamp(2rem, 5vw, 4rem);
      color: white;
      font-weight: 600;
      letter-spacing: 0.1em;
      text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
    }
    
    .hero-keywords span {
      margin: 0 0.2em;
    }
    
    .hero-keywords .dot {
      color: var(--gold);
      font-size: 0.6em;
      vertical-align: middle;
    }
    
    /* Section */
    .section {
      padding: 5rem 2rem;
    }
    
    .section-header {
      text-align: center;
      margin-bottom: 3rem;
    }
    
    .section-title {
      font-size: clamp(1.75rem, 3.5vw, 2.5rem);
      color: var(--navy);
      margin-bottom: 0.75rem;
    }
    
    .section-desc {
      color: rgba(14, 22, 40, 0.7);
      max-width: 500px;
      margin: 0 auto;
      font-size: 1rem;
    }
    
    /* Labs */
    .labs-section {
      background: var(--sand);
    }
    
    .labs-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 1.5rem;
      max-width: 1100px;
      margin: 0 auto;
    }
    
    .lab-card {
      background: white;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      transition: all 0.3s;
      text-decoration: none;
      color: inherit;
      display: block;
    }
    
    .lab-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    }
    
    .lab-card-header {
      height: 3px;
    }
    
    .lab-card-content {
      padding: 1.25rem;
    }
    
    .lab-card-title-row {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-bottom: 0.4rem;
    }
    
    .lab-card-title {
      font-size: 1.1rem;
      color: var(--navy);
    }
    
    .lab-card-tagline {
      color: var(--gold);
      font-size: 0.8rem;
      margin-bottom: 0.75rem;
    }
    
    .lab-card-desc {
      color: rgba(14, 22, 40, 0.7);
      font-size: 0.875rem;
      line-height: 1.6;
    }
    
    /* Cases */
    .cases-section {
      background: white;
    }
    
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.5rem;
      max-width: 1100px;
      margin: 0 auto;
    }
    
    .case-card {
      background: white;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      border: 1px solid rgba(201, 162, 74, 0.15);
      transition: all 0.3s;
      text-decoration: none;
      color: inherit;
      display: block;
    }
    
    .case-card:hover {
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    }
    
    .case-card-image {
      height: 160px;
      background: linear-gradient(135deg, var(--navy) 0%, rgba(14, 22, 40, 0.8) 100%);
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .case-card-tags {
      position: absolute;
      top: 0.75rem;
      left: 0.75rem;
      display: flex;
      gap: 0.4rem;
      flex-wrap: wrap;
    }
    
    .case-card-tag {
      background: var(--gold);
      color: var(--navy);
      padding: 0.2rem 0.5rem;
      border-radius: 4px;
      font-size: 0.7rem;
      font-weight: 600;
    }
    
    .case-card-lab {
      position: absolute;
      bottom: 0.75rem;
      left: 0.75rem;
      color: var(--gold);
      font-size: 0.8rem;
    }
    
    .case-card-icon {
      width: 50px;
      height: 50px;
      border: 2px solid rgba(201, 162, 74, 0.3);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .case-card-icon span {
      font-family: 'Playfair Display', serif;
      color: var(--gold);
      font-size: 1.25rem;
    }
    
    .case-card-content {
      padding: 1.25rem;
    }
    
    .case-card-title {
      font-size: 1rem;
      color: var(--navy);
      margin-bottom: 0.4rem;
    }
    
    .case-card-desc {
      color: rgba(14, 22, 40, 0.6);
      font-size: 0.8rem;
      line-height: 1.5;
    }
    
    /* Insights */
    .insights-section {
      background: var(--sand);
    }
    
    .insights-tabs {
      display: flex;
      justify-content: center;
      gap: 0.75rem;
      margin-bottom: 2rem;
      flex-wrap: wrap;
    }
    
    .insights-tab {
      padding: 0.6rem 1.25rem;
      border: 1px solid rgba(201, 162, 74, 0.3);
      background: white;
      color: var(--navy);
      border-radius: 4px;
      cursor: pointer;
      font-size: 0.85rem;
      font-weight: 500;
      transition: all 0.3s;
    }
    
    .insights-tab:hover,
    .insights-tab.active {
      background: var(--navy);
      color: var(--gold);
      border-color: var(--navy);
    }
    
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 1rem;
      max-width: 900px;
      margin: 0 auto;
    }
    
    .insight-card {
      background: white;
      border-radius: 8px;
      padding: 1.25rem;
      border: 1px solid rgba(201, 162, 74, 0.15);
      transition: all 0.3s;
      text-decoration: none;
      color: inherit;
      display: block;
    }
    
    .insight-card:hover {
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
      border-color: rgba(201, 162, 74, 0.3);
    }
    
    .insight-card-type {
      display: inline-block;
      padding: 0.2rem 0.6rem;
      background: var(--gold);
      color: var(--navy);
      font-size: 0.7rem;
      font-weight: 600;
      border-radius: 4px;
      margin-bottom: 0.75rem;
    }
    
    .insight-card-title {
      font-size: 1rem;
      color: var(--navy);
      line-height: 1.5;
      margin-bottom: 0.5rem;
    }
    
    .insight-card-link {
      color: var(--gold);
      font-size: 0.8rem;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      margin-top: 0.75rem;
    }
    
    /* Join Us */
    .join-hero {
      background: var(--navy);
      padding: 8rem 2rem 5rem;
      text-align: center;
    }
    
    .join-hero-title {
      font-size: clamp(2rem, 5vw, 3.5rem);
      color: white;
      margin-bottom: 1rem;
    }
    
    .join-section {
      padding: 4rem 2rem;
    }
    
    .join-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 2rem;
      max-width: 1000px;
      margin: 0 auto;
    }
    
    .join-card {
      background: white;
      border-radius: 12px;
      padding: 2rem;
      border: 1px solid rgba(201, 162, 74, 0.2);
      transition: all 0.3s;
    }
    
    .join-card:hover {
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
      border-color: rgba(201, 162, 74, 0.4);
    }
    
    .join-card-icon {
      width: 60px;
      height: 60px;
      background: var(--gold);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
    }
    
    .join-card-icon svg {
      width: 28px;
      height: 28px;
      color: var(--navy);
    }
    
    .join-card-title {
      font-size: 1.25rem;
      color: var(--navy);
      margin-bottom: 0.75rem;
    }
    
    .join-card-desc {
      color: rgba(14, 22, 40, 0.7);
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 1.5rem;
    }
    
    .join-card-features {
      list-style: none;
      margin-bottom: 1.5rem;
    }
    
    .join-card-features li {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: rgba(14, 22, 40, 0.7);
      font-size: 0.85rem;
      margin-bottom: 0.5rem;
    }
    
    .join-card-features li::before {
      content: '✓';
      color: var(--gold);
      font-weight: bold;
    }
    
    .join-card-btn {
      display: inline-block;
      background: var(--navy);
      color: var(--gold);
      padding: 0.75rem 1.5rem;
      border-radius: 6px;
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 600;
      transition: all 0.3s;
    }
    
    .join-card-btn:hover {
      background: rgba(14, 22, 40, 0.9);
    }
    
    /* Contact Form */
    .contact-section {
      background: var(--sand);
      padding: 4rem 2rem;
    }
    
    .contact-container {
      max-width: 600px;
      margin: 0 auto;
    }
    
    .contact-title {
      text-align: center;
      font-size: 1.75rem;
      color: var(--navy);
      margin-bottom: 2rem;
    }
    
    .form-group {
      margin-bottom: 1.25rem;
    }
    
    .form-label {
      display: block;
      color: var(--navy);
      font-size: 0.9rem;
      font-weight: 500;
      margin-bottom: 0.5rem;
    }
    
    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 1px solid rgba(201, 162, 74, 0.3);
      border-radius: 6px;
      font-size: 0.9rem;
      font-family: inherit;
      background: white;
      transition: border-color 0.3s;
    }
    
    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      outline: none;
      border-color: var(--gold);
    }
    
    .form-textarea {
      min-height: 120px;
      resize: vertical;
    }
    
    .form-checkbox-group {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
    }
    
    .form-checkbox {
      display: flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.5rem 0.75rem;
      background: white;
      border: 1px solid rgba(201, 162, 74, 0.3);
      border-radius: 4px;
      cursor: pointer;
      font-size: 0.85rem;
      transition: all 0.3s;
    }
    
    .form-checkbox:hover {
      border-color: var(--gold);
    }
    
    .form-checkbox input {
      cursor: pointer;
    }
    
    .form-submit {
      width: 100%;
      padding: 1rem;
      background: var(--gold);
      color: var(--navy);
      border: none;
      border-radius: 6px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s;
    }
    
    .form-submit:hover {
      background: rgba(201, 162, 74, 0.9);
    }
    
    /* Footer - 深色背景，使用白色Logo */
    .footer {
      background: var(--navy);
      color: white;
      padding: 3rem 2rem 1.5rem;
    }
    
    .footer-container {
      max-width: 1100px;
      margin: 0 auto;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 2rem;
      margin-bottom: 2rem;
    }
    
    .footer-brand {
      margin-bottom: 0.75rem;
    }
    
    .footer-brand img {
      height: 40px;
      width: auto;
    }
    
    .footer-desc {
      color: rgba(255, 255, 255, 0.6);
      font-size: 0.8rem;
      line-height: 1.6;
    }
    
    .footer-column h4 {
      color: var(--gold);
      font-size: 0.9rem;
      margin-bottom: 0.75rem;
    }
    
    .footer-column ul {
      list-style: none;
    }
    
    .footer-column li {
      margin-bottom: 0.4rem;
    }
    
    .footer-column a {
      color: rgba(255, 255, 255, 0.6);
      text-decoration: none;
      font-size: 0.8rem;
      transition: color 0.3s;
    }
    
    .footer-column a:hover {
      color: var(--gold);
    }
    
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }
    
    .footer-copyright {
      color: rgba(255, 255, 255, 0.5);
      font-size: 0.8rem;
    }
    
    .footer-links {
      display: flex;
      gap: 1.25rem;
    }
    
    .footer-links a {
      color: rgba(255, 255, 255, 0.5);
      text-decoration: none;
      font-size: 0.8rem;
      transition: color 0.3s;
    }
    
    .footer-links a:hover {
      color: var(--gold);
    }
    
    /* Mobile */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 0.5rem;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }

      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(14, 22, 40, 0.97);
        padding: 1rem 1.5rem 1.5rem;
        gap: 0.5rem;
      }

      .nav-links.active li a {
        display: block;
        padding: 0.6rem 0;
        border-bottom: 1px solid rgba(255,255,255,0.08);
      }
      
      .nav-cta {
        display: none;
      }
      
      .mobile-menu-btn {
        display: block;
      }
      
      .hero-keywords {
        font-size: clamp(1.5rem, 8vw, 2.5rem);
      }
      
      .hero-keywords span {
        display: block;
        margin: 0.2em 0;
      }
      
      .hero-keywords .dot {
        display: none;
      }
      
      .section {
        padding: 3rem 1.5rem;
      }
      
      .join-grid {
        grid-template-columns: 1fr;
      }
    }