/* footer */
    footer {
      background: #0b1a2f;
      color: #b0c4de;
      padding: 3.5rem 0 2rem;
      margin-top: 4rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 2.5rem;
    }
    .footer-col a {
      color: #b0c4de;
      text-decoration: none;
      display: block;
      margin: 0.6rem 0;
      transition: 0.2s;
    }
    .footer-col a:hover {
      color: white;
    }
    .footer-col strong {
      color: white;
      font-weight: 600;
    }
    .copyright {
      text-align: center;
      border-top: 1px solid #1e3a5f;
      margin-top: 3rem;
      padding-top: 2rem;
      font-size: 0.9rem;
    }