html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100%;
  width: 100%;
}

/* Видео на весь экран */
.background-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  z-index: -1;
}

/* Контент */
.content {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(0, 0, 0, 0.5);
  color: #f1f1f1;
  width: 100%;
  padding: 20px;
  text-align: center;
}

/* Панель звука */
.sound-control {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(0, 0, 0, 0.2);
  padding: 8px 12px;
  border-radius: 20px;
}

/* Кнопка */
#soundToggle {
  background: none;
  color: #fff;
  border: none;
  font-size: 22px;
  cursor: pointer;
  transition: transform 0.2s;
}
#soundToggle:hover {
  transform: scale(1.2);
}

/* Ползунок */
#volumeSlider {
  -webkit-appearance: none;
  width: 100px;
  height: 4px;
  border-radius: 2px;
  background: #ddd;
  outline: none;
  cursor: pointer;
  transition: background 0.3s;
}
#volumeSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
}
#volumeSlider:hover {
  background: #fff;
}