body { margin: 0; font-family: sans-serif; }
    #popup-bg {
      display: none;
      position: fixed;
      left: 0; top: 0; width: 100vw; height: 100vh;
      background: rgba(0,0,0,0.8); z-index: 9999;
    }
    #popup-bg.active { display: block; }
    #popup-content {
      position: fixed;
      top: 60%; left: 50%;
      transform: translate(-50%, -50%);
      background: #000;
      border-radius: 8px;
      box-shadow: 0 0 20px #000;
      max-width: 90vw;
      max-height: 90vh;
      padding: 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      margin: 0;
    }
    #popup-close {
      position: absolute; top: 5px; right: 10px; color: #fff; font-size: 2em; cursor: pointer; z-index: 2;
    }
    #yt-iframe {
      display: block;
      border: none;
      border-radius: 8px;
      background: #000;
      width: 700px;
      height: 400px;
      max-width: 90vw;
      max-height: 60vh;
    }
    @media (max-width: 600px) {
      #yt-iframe { width: 90vw; height: 40vw; }
    }
    .wobble-vertical {
      display: inline-block;
    }
    .wobble-vertical.wobble {
      animation: wobble 0.6s;
    }
    @keyframes wobble {
      0%, 100% { transform: translateY(0); }
      20% { transform: translateY(-8px); }
      40% { transform: translateY(8px); }
      60% { transform: translateY(-4px); }
      80% { transform: translateY(4px); }
    }