/* Full-viewport board layout */
body {
  background: #000;
  margin: 0;
  overflow: hidden;
}

/* Board Section — fills entire viewport, centered */
.board-section {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #000;
}

/* Volume toggle — frosted glass pill */
.volume-btn-corner {
  position: fixed;
  bottom: 16px;
  right: 16px;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.6);
  padding: 8px;
  cursor: pointer;
  transition: color 0.2s, background 0.2s, box-shadow 0.2s;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.volume-btn-corner:hover {
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.12);
}

.volume-btn-corner:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.5);
  outline-offset: 2px;
}

.volume-btn-corner.muted {
  color: rgba(255, 255, 255, 0.3);
}

.volume-btn-corner.muted svg path:last-child,
.volume-btn-corner.muted svg path:nth-child(2) {
  display: none;
}