* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        font-family: "Microsoft YaHei", "Arial", sans-serif;
        line-height: 1.6;
        color: #000;
        background: linear-gradient(135deg, #3498db 0%, #9b59b6 100%);
        min-height: 100vh;
        padding: 20px;
      }

      .container {
        max-width: 1200px;
        margin: 0 auto;
        background: white;
        border-radius: 20px;
        overflow: hidden;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
      }

      .header {
        background: linear-gradient(135deg, #2c3e50 0%, #8e44ad 100%);
        color: #000;
        padding: 3rem 2rem;
        text-align: center;
        position: relative;
        overflow: hidden;
      }

      .header::before {
        content: "";
        position: absolute;
        top: -50%;
        left: -50%;
        width: 200%;
        height: 200%;
        background: repeating-linear-gradient(
          45deg,
          transparent,
          transparent 10px,
          rgba(255, 255, 255, 0.05) 10px,
          rgba(255, 255, 255, 0.05) 20px
        );
        animation: slide 20s linear infinite;
      }

      @keyframes slide {
        0% {
          transform: translate(-50%, -50%) rotate(0deg);
        }
        100% {
          transform: translate(-50%, -50%) rotate(360deg);
        }
      }

      .header-content {
        position: relative;
        z-index: 1;
      }

      .header h1 {
        font-size: 2.5rem;
        margin-bottom: 1rem;
        font-weight: 700;
      }

      .header p {
        font-size: 1.2rem;
        opacity: 0.9;
      }

      .intro-section {
        padding: 3rem 2rem;
        background: #f8f9fa;
        border-bottom: 1px solid #e9ecef;
      }

      .intro-content {
        max-width: 800px;
        margin: 0 auto;
        text-align: center;
      }

      .intro-content h2 {
        color: #2c3e50;
        font-size: 2rem;
        margin-bottom: 1.5rem;
      }

      .intro-content p {
        color: #000;
        font-size: 1.1rem;
        line-height: 1.8;
        margin-bottom: 2rem;
      }

      .university-link {
        display: inline-block;
        background: linear-gradient(135deg, #3498db 0%, #2c3e50 100%);
        color: white;
        text-decoration: none;
        padding: 1rem 2rem;
        border-radius: 30px;
        font-weight: 600;
        font-size: 1.1rem;
        transition: all 0.3s ease;
        margin-bottom: 1rem;
      }

      .university-link:hover {
        transform: translateY(-2px);
        box-shadow: 0 10px 25px rgba(44, 62, 80, 0.3);
      }

      .contacts-section {
        padding: 3rem 2rem;
      }

      .section-title {
        text-align: center;
        font-size: 2rem;
        color: #2c3e50;
        margin-bottom: 3rem;
        position: relative;
      }

      .section-title::after {
        content: "";
        display: block;
        width: 80px;
        height: 3px;
        background: #3498db;
        margin: 1rem auto;
      }

      .contacts-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 1.5rem;
      }

      .contact-card {
        background: white;
        border: 2px solid #e9ecef;
        border-radius: 15px;
        padding: 1.5rem;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
        animation: fadeInUp 0.6s ease forwards;
      }

      .contact-card::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 4px;
        height: 100%;
        background: linear-gradient(135deg, #3498db 0%, #2c3e50 100%);
        transform: scaleY(0);
        transition: transform 0.3s ease;
      }

      .contact-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        border-color: #3498db;
      }

      .contact-card:hover::before {
        transform: scaleY(1);
      }

      .group-name {
        font-size: 1.3rem;
        font-weight: 600;
        color: #2c3e50;
        margin-bottom: 1rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
      }

      .group-icon {
        width: 30px;
        height: 30px;
        background: linear-gradient(135deg, #3498db 0%, #2c3e50 100%);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-size: 0.9rem;
        font-weight: bold;
      }

      .qq-info {
        display: flex;
        align-items: center;
        gap: 1rem;
        background: #f8f9fa;
        padding: 1rem;
        border-radius: 10px;
        margin-bottom: 1rem;
      }

      .qq-number {
        font-size: 1.2rem;
        font-weight: 600;
        color: #3498db;
        font-family: "Courier New", monospace;
      }

      .copy-btn {
        background: #27ae60;
        color: white;
        border: none;
        padding: 0.5rem 1rem;
        border-radius: 20px;
        cursor: pointer;
        font-size: 0.9rem;
        transition: all 0.3s ease;
        white-space: nowrap;
      }

      .copy-btn:hover {
        background: #229954;
        transform: scale(1.05);
      }

      .copy-btn.copied {
        background: #7f8c8d;
      }

      .footer {
        background: linear-gradient(135deg, #2c3e50 0%, #8e44ad 100%);
        color: #000;
        padding: 2rem;
        text-align: center;
      }

      .footer p {
        margin-bottom: 0.5rem;
      }

      .footer a {
        color: #ffd700;
        text-decoration: none;
        font-weight: 600;
      }

      .footer a:hover {
        text-decoration: underline;
      }

      @media (max-width: 768px) {
        .container {
          border-radius: 0;
          margin: -20px;
        }

        .header h1 {
          font-size: 2rem;
        }

        .header p {
          font-size: 1rem;
        }

        .contacts-grid {
          grid-template-columns: 1fr;
        }

        .intro-content p {
          font-size: 1rem;
        }

        .section-title {
          font-size: 1.5rem;
        }
      }

      @keyframes fadeInUp {
        from {
          opacity: 0;
          transform: translateY(30px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      .contact-card:nth-child(1) {
        animation-delay: 0.05s;
      }
      .contact-card:nth-child(2) {
        animation-delay: 0.1s;
      }
      .contact-card:nth-child(3) {
        animation-delay: 0.15s;
      }
      .contact-card:nth-child(4) {
        animation-delay: 0.2s;
      }
      .contact-card:nth-child(5) {
        animation-delay: 0.25s;
      }
      .contact-card:nth-child(6) {
        animation-delay: 0.3s;
      }
      .contact-card:nth-child(7) {
        animation-delay: 0.35s;
      }
      .contact-card:nth-child(8) {
        animation-delay: 0.4s;
      }
      .contact-card:nth-child(9) {
        animation-delay: 0.45s;
      }
      .contact-card:nth-child(10) {
        animation-delay: 0.5s;
      }

      .feature-badge {
        display: inline-block;
        background: linear-gradient(135deg, #e74c3c 0%, #f39c12 100%);
        color: white;
        padding: 0.3rem 0.8rem;
        border-radius: 15px;
        font-size: 0.8rem;
        font-weight: 600;
        margin-bottom: 0.5rem;
      }

      .multi-pattern {
        background-image: repeating-linear-gradient(
            45deg,
            transparent,
            transparent 35px,
            rgba(52, 152, 219, 0.1) 35px,
            rgba(52, 152, 219, 0.1) 70px
          ),
          repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 35px,
            rgba(44, 62, 80, 0.05) 35px,
            rgba(44, 62, 80, 0.05) 70px
          );
        background-size: 100% 100%;
      }

      .main-group {
        border: 3px solid #3498db;
        background: linear-gradient(135deg, #ebf5fb 0%, #e3f2fd 100%);
      }

      .main-group .group-name {
        color: #2c3e50;
        font-size: 1.4rem;
      }

      .main-group .group-icon {
        background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
        width: 35px;
        height: 35px;
        font-size: 1rem;
      }

      .academic-card {
        position: relative;
      }

      .academic-card::after {
        content: "📚";
        position: absolute;
        top: 10px;
        right: 10px;
        font-size: 1.2rem;
        opacity: 0.7;
      }

      .tech-card::after {
        content: "💻";
      }

      .contest-card::after {
        content: "🏆";
      }

      .research-card::after {
        content: "🔬";
      }

      .education-card::after {
        content: "📖";
      }

      .library-card::after {
        content: "📚";
      }