/* ==========================================================================
   KanoAI Gujarati Text-to-Speech (TTS) Studio Stylesheet
   Supports AI4Bharat IndicF5 & Indic-TTS / Bodhan-AI Indic-Speak
   ========================================================================== */

.tts-workspace {
  display: flex;
  flex-direction: column;
  gap: 24px;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Header & Status Bar */
.tts-header-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  backdrop-filter: blur(12px);
}

.tts-title-group h2 {
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}

.tts-title-group p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.tts-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tts-status-badge.connected {
  background: rgba(46, 160, 67, 0.15);
  border-color: rgba(46, 160, 67, 0.4);
  color: #3fb950;
}

.tts-status-badge.fallback {
  background: rgba(255, 179, 0, 0.15);
  border-color: rgba(255, 179, 0, 0.4);
  color: #ffb300;
}

.tts-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #8b949e;
}

.tts-status-badge.connected .tts-status-dot {
  background: #3fb950;
  box-shadow: 0 0 8px #3fb950;
}

.tts-status-badge.fallback .tts-status-dot {
  background: #ffb300;
  box-shadow: 0 0 8px #ffb300;
}

/* Header Compare Button */
.tts-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.tts-compare-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(192, 132, 252, 0.15) 100%);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #e0e7ff;
  padding: 7px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.tts-compare-btn:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.3) 0%, rgba(192, 132, 252, 0.3) 100%);
  border-color: #818cf8;
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.tts-compare-btn .btn-arrow {
  transition: transform var(--transition-fast);
}

.tts-compare-btn:hover .btn-arrow {
  transform: translateX(3px);
}

.tts-engine-compare-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 12px;
  color: #818cf8;
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.tts-engine-compare-link:hover {
  color: #a5b4fc;
  text-decoration: underline;
}

/* Engine Mode Selector */
.tts-engine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.tts-engine-card {
  background: var(--bg-card);
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: left;
  user-select: none;
}

.tts-engine-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.tts-engine-card.active {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 1px var(--accent-primary), var(--shadow-md);
}

.tts-engine-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
}

.tts-engine-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.tts-engine-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--accent-primary);
  border: 1px solid var(--border-accent);
}

.tts-engine-card p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 12px;
}

.tts-engine-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 11px;
  color: var(--text-muted);
}

.tts-engine-meta span {
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Main Inputs Layout */
.tts-input-container {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
}

.tts-text-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.tts-panel-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tts-textarea-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
}

.tts-textarea {
  width: 100%;
  min-height: 140px;
  padding: 14px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Noto Sans Gujarati', 'Outfit', sans-serif;
  font-size: 18px;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tts-textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.tts-text-counter-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* Preset Prompt Chips */
.tts-presets-wrapper {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tts-presets-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.tts-presets-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tts-preset-chip {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-family: 'Noto Sans Gujarati', sans-serif;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tts-preset-chip:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-1px);
}

/* Settings Column */
.tts-settings-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.tts-setting-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tts-setting-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
}

.tts-select, .tts-input-field {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'Outfit', sans-serif;
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.tts-select:focus, .tts-input-field:focus {
  border-color: var(--accent-primary);
}

.tts-speaker-preview-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Action Button */
.tts-action-container {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: auto;
}

.btn-tts-synthesize {
  flex: 1;
  background: var(--accent-primary);
  color: #ffffff;
  border: none;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 4px 14px var(--accent-glow);
  transition: all var(--transition-normal);
}

.btn-tts-synthesize:hover:not(:disabled) {
  background: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-tts-synthesize:active:not(:disabled) {
  transform: translateY(0);
}

.btn-tts-synthesize:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.tts-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #ffffff;
  animation: spin 0.8s linear infinite;
}

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

/* Results & Audio Player Section */
.tts-results-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 4px;
}

.tts-player-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.tts-player-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--cyan-stroke));
}

.tts-player-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
}

.tts-player-meta-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tts-player-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tts-player-subtext {
  font-size: 13px;
  color: var(--text-secondary);
  font-family: 'Noto Sans Gujarati', sans-serif;
}

.tts-metrics-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tts-metric-tag {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
}

.tts-metric-tag.highlight {
  border-color: var(--border-accent);
  color: var(--accent-primary);
}

/* Canvas Waveform Visualizer */
.tts-waveform-container {
  width: 100%;
  height: 84px;
  background: var(--stage-bg);
  border: 1px solid var(--stage-border);
  border-radius: var(--radius-md);
  position: relative;
  cursor: pointer;
  overflow: hidden;
  user-select: none;
}

.tts-waveform-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.tts-waveform-played-mask {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 0%;
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.16) 0%, rgba(0, 242, 254, 0.12) 100%);
  pointer-events: none;
  border-right: 1px solid rgba(255, 107, 53, 0.5);
  z-index: 1;
}

.tts-waveform-progress-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0%;
  width: 2px;
  background: var(--accent-primary);
  box-shadow: 0 0 10px var(--accent-primary), 0 0 4px #ffffff;
  pointer-events: none;
  transform: translateX(-50%);
  z-index: 3;
  transition: none; /* Continuous 60fps/120fps sync via requestAnimationFrame */
}

.tts-waveform-progress-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 0 6px var(--accent-primary);
}

/* Audio Player Controls Bar */
.tts-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.tts-controls-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-tts-play {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-primary);
  color: #fff;
  border: none;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px var(--accent-glow);
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.btn-tts-play:hover {
  background: var(--accent-primary-hover);
  transform: scale(1.06);
}

.tts-time-display {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--text-secondary);
}

.tts-controls-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tts-speed-selector {
  display: flex;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.tts-speed-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 6px 10px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.tts-speed-btn.active {
  background: var(--accent-primary);
  color: #fff;
}

.btn-tts-download {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-tts-download:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Comparison Side-by-Side Grid */
.tts-comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.tts-comparison-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tts-comp-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 2px;
}

.tts-comp-model-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

/* History Strip */
.tts-history-container {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tts-history-header {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tts-history-items {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.tts-history-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  max-width: 220px;
  transition: border-color var(--transition-fast);
}

.tts-history-item:hover {
  border-color: var(--accent-primary);
}

.tts-history-text {
  font-family: 'Noto Sans Gujarati', sans-serif;
  font-size: 12px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .tts-engine-grid {
    grid-template-columns: 1fr;
  }

  .tts-input-container {
    grid-template-columns: 1fr;
  }

  .tts-comparison-grid {
    grid-template-columns: 1fr;
  }
}

/* Phoneme Diagnostics Chips (eSpeak-NG) */
.tts-phoneme-debug-card {
  animation: fadeIn 0.3s ease-in-out;
}

.tts-phoneme-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 11px;
  transition: all var(--transition-fast);
}

.tts-phoneme-chip:hover {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--cyan-stroke);
  color: #ffffff;
  transform: translateY(-1px);
}