/* layout flex para footer al fondo */
      html, body { height: 100%; }
      body { display: flex; flex-direction: column; }
      main { flex: 1; }

      /* Sección Contacto */
      .contact-section {
        background-color: #f8f9fa;
        padding: 4rem 0;
      }
      .section-header {
        font-size: 2rem;
        font-weight: 600;
        position: relative;
        margin-bottom: 2rem;
      }
      .section-header::after {
        content: '';
        display: block;
        width: 60px;
        height: 4px;
        background-color: #0d6efd;
        margin: .5rem auto 0;
        border-radius: 2px;
      }

      /* Tarjetas de contacto */
      .contact-card {
        border: none;
        border-radius: .75rem;
        overflow: hidden;
        background-color: #fff;
        transition: transform .3s ease, box-shadow .3s ease;
      }
      .contact-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 16px rgba(0,0,0,.1);
      }
      .contact-card .card-body {
        padding: 1.5rem;
      }
      .contact-card .card-title {
        font-size: 1.25rem;
        font-weight: 600;
      }
      .contact-card .contact-info {
        font-size: .95rem;
        color: #555;
        margin-top: .75rem;
      }
      .contact-card i {
        font-size: 3rem;
        color: #0d6efd;
      }