body {
    background: #f0f4f8;
  }

  /* PDF container wrapper */
  .pdf-wrapper {
    position: relative;
    width: 90%;               /* manja širina */
    max-width: 900px;         /* optimalna desktop širina */
    height: 75vh;             /* manja visina, više pregledno */
    margin: 0 auto;           /* centrirano */
    border-radius: 1.5rem;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0,0,0,0.25);
    border: 3px solid #0070C0;
    background: #ffffff;
  }

  /* PDF iframe */
  #pdf-frame {
    width: 100%;
    height: 100%;
    border: none;
  }

  /* Download button */
  .download-btn {
    display: inline-block;
    background: linear-gradient(90deg, #0070C0, #005a99);
    color: #fff;
    font-weight: 600;
    padding: 0.75rem 2rem;
    border-radius: 0.75rem;
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    font-size: 1rem;
  }

  .download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.35);
    background: linear-gradient(90deg, #005a99, #003f66);
  }

  /* Fullscreen button */
  .fullscreen-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(0,112,192,0.85);
    color: #fff;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 10;
  }

  .fullscreen-btn:hover {
    background: rgba(0,112,192,1);
  }