margin-bottom: 2rem;
      }
      .nav button {
        padding: 0.75rem 1.5rem;
        margin: 0 0.5rem;
        border: none;
        background: #0b5ed7;
        color: white;
        cursor: pointer;
        border-radius: 6px;
      }
      .nav button:hover {
        background: #084bb3;
      }
      .section {
        display: none;
      }
      .section.active {
        display: block;
      }
      .container {
        max-width: 1000px;
        margin: auto;
      }
      .box {
        width: