/* zaten tanımlı */
      .virtual-wrap { position:relative; width:100%; padding-top:56.25%; overflow:hidden; }
      .virtual-wrap iframe { position:absolute; top:0; left:0; width:100%; height:100%; }

      /* tam ekran fallback */
      .virtual-wrap.fullscreen {
        position:fixed !important;
        top:0; left:0;
        width:100vw !important;
        height:100vh !important;
        padding:0 !important;
        margin:0 !important;
        z-index:9999;
      }
      .virtual-wrap.fullscreen iframe {
        width:100%; height:100%;
      }

      .fs-close-btn {
      position: absolute;
      top: 16px;
      right: 16px;
      display: none;
      background: rgba(0,0,0,0.6);
      color: white;
      border: none;
      font-size: 24px;
      line-height: 1;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      z-index: 10000;
    }

    /* Gerçek Fullscreen API veya fallback sınıfındayken göster */
    .virtual-wrap.fullscreen .fs-close-btn,
    :fullscreen .fs-close-btn,
    :-webkit-full-screen .fs-close-btn {
      display: block;
    }