/* FULLSCREEN OVERLAY */
.preview-modal {
   display: none;
   position: fixed;
   z-index: 999999;      /* always on top */
   left: 0;
   top: 0;
   width: 100vw;
   height: 100vh;
   background: #ffffff;  /* no transparency → hide background fully */
}

/* FULLSCREEN CONTENT */
.preview-content {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   overflow: hidden;
}

/* IFRAME FULL SIZE */
.preview-content iframe {
   width: 100%;
   height: 100%;
   border: none;
}

/* CLOSE BUTTON */
.preview-close {
   position: absolute;
   top: 10px;
   right: 20px;
   font-size: 32px;
   font-weight: bold;
   background: #fff;
   padding: 5px 12px;
   border-radius: 6px;
   cursor: pointer;
   z-index: 1000000;
}