/* 소개 영상 오른쪽 아래 소리 켜기/끄기 버튼 */
.kr-intro-video { position: relative; }
.sb-sound {
  position: absolute;
  right: 22px;
  bottom: 22px;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 50%;
  background: rgba(8, 15, 36, 0.62);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: #fff;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.15s;
}
.sb-sound:hover { background: rgba(8, 15, 36, 0.85); transform: scale(1.05); }
.sb-sound:focus-visible { outline: 3px solid #8db8ff; outline-offset: 2px; }
.sb-sound svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.sb-sound svg path:first-child { fill: currentColor; }
.sb-sound .sb-sound-on { display: none; }
.sb-sound[aria-pressed="true"] .sb-sound-on { display: block; }
.sb-sound[aria-pressed="true"] .sb-sound-off { display: none; }