/**
 * Xentauri Listen Button - CSS
 * Floating button to trigger TTS narration on demand
 */

/* ============================================================================
   LISTEN BUTTON CONTAINER
   ============================================================================ */

.xti-listen-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
}

.xti-listen-container.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ============================================================================
   LISTEN BUTTON
   ============================================================================ */

.xti-listen-button {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: linear-gradient(135deg, hsl(252, 76%, 55%), hsl(190, 100%, 45%));
  border: none;
  border-radius: 50px;
  color: white;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(124, 92, 239, 0.4);
  transition: all 0.2s ease;
  outline: none;
}

.xti-listen-button:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 30px rgba(124, 92, 239, 0.5);
}

.xti-listen-button:active {
  transform: scale(0.98);
}

.xti-listen-button:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

/* ============================================================================
   BUTTON STATES
   ============================================================================ */

/* Loading state */
.xti-listen-button.loading {
  background: linear-gradient(135deg, hsl(32, 100%, 50%), hsl(45, 100%, 50%));
  box-shadow: 0 4px 20px rgba(255, 165, 0, 0.4);
}

/* Playing state */
.xti-listen-button.playing {
  background: linear-gradient(135deg, hsl(152, 100%, 40%), hsl(190, 100%, 45%));
  box-shadow: 0 4px 20px rgba(0, 255, 128, 0.4);
}

/* ============================================================================
   BUTTON ICON
   ============================================================================ */

.xti-listen-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.xti-listen-icon svg {
  width: 100%;
  height: 100%;
}

/* Loading spinner */
.xti-listen-spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: xti-spin 0.8s linear infinite;
}

@keyframes xti-spin {
  to {
    transform: rotate(360deg);
  }
}

/* Sound wave animation for playing state */
.xti-sound-wave {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 20px;
}

.xti-sound-bar {
  width: 3px;
  height: 100%;
  background: white;
  border-radius: 3px;
  animation: xti-sound-wave 0.5s ease-in-out infinite;
}

.xti-sound-bar:nth-child(1) { animation-delay: 0s; }
.xti-sound-bar:nth-child(2) { animation-delay: 0.1s; }
.xti-sound-bar:nth-child(3) { animation-delay: 0.2s; }
.xti-sound-bar:nth-child(4) { animation-delay: 0.3s; }

@keyframes xti-sound-wave {
  0%, 100% {
    transform: scaleY(0.3);
  }
  50% {
    transform: scaleY(1);
  }
}

/* ============================================================================
   TV / LARGE SCREEN BREAKPOINTS
   ============================================================================ */

/* HD Ready (1280x720) */
@media (min-width: 1280px) and (min-height: 720px) {
  .xti-listen-container {
    bottom: 3rem;
    right: 3rem;
  }

  .xti-listen-button {
    padding: 1.25rem 2rem;
    font-size: 1.5rem;
    gap: 1rem;
  }

  .xti-listen-icon {
    width: 32px;
    height: 32px;
  }

  .xti-listen-spinner {
    width: 28px;
    height: 28px;
  }

  .xti-sound-wave {
    height: 28px;
  }

  .xti-sound-bar {
    width: 4px;
  }
}

/* Full HD (1920x1080) */
@media (min-width: 1920px) and (min-height: 1080px) {
  .xti-listen-container {
    bottom: 4rem;
    right: 4rem;
  }

  .xti-listen-button {
    padding: 1.5rem 2.5rem;
    font-size: 1.75rem;
    gap: 1.25rem;
  }

  .xti-listen-icon {
    width: 40px;
    height: 40px;
  }

  .xti-listen-spinner {
    width: 36px;
    height: 36px;
    border-width: 4px;
  }

  .xti-sound-wave {
    height: 36px;
  }

  .xti-sound-bar {
    width: 5px;
  }
}

/* 4K UHD (3840x2160) */
@media (min-width: 3840px) and (min-height: 2160px) {
  .xti-listen-container {
    bottom: 6rem;
    right: 6rem;
  }

  .xti-listen-button {
    padding: 2rem 3.5rem;
    font-size: 2.5rem;
    gap: 1.5rem;
    border-radius: 80px;
  }

  .xti-listen-icon {
    width: 56px;
    height: 56px;
  }

  .xti-listen-spinner {
    width: 48px;
    height: 48px;
    border-width: 5px;
  }

  .xti-sound-wave {
    height: 48px;
    gap: 5px;
  }

  .xti-sound-bar {
    width: 7px;
  }
}