body {
    margin: 0;
    font-family: system-ui, -apple-system, Arial, sans-serif;
  }

  .top-bar {
    display: flex;
    justify-content: center;
    padding: 20px 0;
  }

  .btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 16px;
    border: 1px solid #000;
    background-color: #dedede;
    color: #000;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.25s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  }

  .btn:hover {
    background-color: #e60000;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.2);
  }

  .btn:active {
    transform: translateY(0);
    box-shadow: 0 3px 8px rgba(0,0,0,0.15);
  }

  /* Responsive */
  @media (max-width: 600px) {
    .btn {
      width: 80%;
      text-align: center;
      font-size: 18px;
    }
  }