* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  html, body {
    height: 100%;
    overflow: hidden;
    font-family: Arial, sans-serif;
  }

  #loading-screen {
    position: fixed;
    width: 100%;
    height: 100%;
    background: black;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 1000;
  }

  video.background-video {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1000;
  }

  .controls {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }

  .volume-slider {
    writing-mode: vertical-lr;
    appearance: none;
    height: 150px;
    width: 10px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 5px;
    outline: none;
    cursor: pointer;
    transform: rotate(180deg);
  }

  .volume-slider::-webkit-slider-thumb {
    appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: white;
    box-shadow: 0 0 2px rgba(0,0,0,0.3);
  }

  .volume-slider::-webkit-slider-runnable-track {
    background: rgba(255, 255, 255, 0.4);
    border-radius: 5px;
  }

  .mute-button {
    background: white;
    color: black;
    border: none;
    padding: 8px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
  }