rgba(0, 0, 0, 0.15);
      background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    }

    .testimonial-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      border-radius: 16px;
      padding: 2px;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      mask-composite: exclude;
      opacity: 0;
      transition: opacity 0.3s ea