.tuner-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin: 0 auto 1.5rem;
}

.tuner-canvas-card {
  width: 100%;
  max-width: 680px;
  background-color: var(--bg-surface-sunken);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: var(--shadow-inner);
}

[data-theme="dark"] .tuner-canvas-card {
  background-color: #1e293b; 
  border-color: #334155;
  box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.25);
}

#tunerframe {
  width: 100%;
  max-width: 600px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 auto;
}

#tunerback {
  width: 100% !important;
  max-width: 600px !important;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 auto;
  position: relative;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

#tunercanvas {
  display: block;
  width: 100% !important;
  max-width: 600px !important;
  height: auto !important;
  margin: 0 auto;
  aspect-ratio: 2 / 1;
}

.cents-meter-bar {
  width: 100%;
  max-width: 500px;
  margin: 1.25rem auto 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.cents-scale {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 0 4px;
}

.cents-track {
  position: relative;
  height: 12px;
  background-color: var(--meter-track);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.cents-center-mark {
  position: absolute;
  left: 50%;
  top: 0;
  width: 4px;
  height: 100%;
  background-color: var(--color-success);
  transform: translateX(-50%);
  z-index: 2;
  border-radius: 1px;
}

.cents-needle-indicator {
  position: absolute;
  top: 0;
  left: 50%;
  width: 4px;
  height: 100%;
  background-color: var(--accent-color);
  transform: translateX(-50%);
  transition: left 0.1s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  z-index: 3;
  border-radius: 2px;
}

.cents-meter-bar.in-tune .cents-needle-indicator {
  background-color: var(--color-success);
  box-shadow: 0 0 8px var(--color-success);
}

.cents-meter-bar.flat .cents-needle-indicator {
  background-color: var(--color-warning);
}

.cents-meter-bar.sharp .cents-needle-indicator {
  background-color: var(--color-danger);
}

.tuner-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  width: 100%;
  max-width: 780px;
  margin: 1.5rem auto;
}

.metric-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 0.75rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.metric-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.metric-value.live-freq {
  color: var(--accent-color);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  background-color: var(--bg-surface-sunken);
  color: var(--text-secondary);
}

.status-badge.status-ready {
  color: var(--text-muted);
}

.status-badge.status-intune {
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-badge.status-flat {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
  border: 1px solid rgba(217, 119, 6, 0.3);
}

.status-badge.status-sharp {
  background-color: var(--color-danger-bg);
  color: var(--color-danger);
  border: 1px solid rgba(220, 38, 38, 0.3);
}

.string-selector-panel {
  width: 100%;
  max-width: 780px;
  margin: 2rem auto 1rem;
  background-color: var(--bg-surface-sunken);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.string-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.string-panel-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

.tuning-mode-tabs {
  display: flex;
  gap: 0.35rem;
  background-color: var(--bg-surface);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.mode-tab-btn {
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 4px;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.mode-tab-btn.active {
  background-color: var(--accent-color);
  color: var(--text-inverse);
}

.string-buttons-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.string-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 74px;
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
  position: relative;
  cursor: pointer;
  padding: 0.35rem 0.25rem;
}

.string-btn:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.string-btn.active {
  border-color: var(--accent-color);
  background-color: var(--accent-subtle);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.25);
}

.string-num {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
}

.string-note {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.string-freq {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.string-play-hint {
  display: none;
}

.tuner-master-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.main-toggle-btn {
  min-width: 200px;
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
}

.main-toggle-btn.btn-active {
  background-color: var(--color-danger);
  color: #ffffff;
}

.main-toggle-btn.btn-active:hover {
  background-color: #b91c1c;
}

@media (max-width: 768px) {
  .tuner-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .string-btn {
    width: 62px;
    height: 74px;
  }
  
  .string-note {
    font-size: 1.15rem;
  }
  
  .string-panel-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .string-buttons-row {
    gap: 0.5rem;
  }
  
  .string-btn {
    width: 52px;
    height: 66px;
  }
  
  .string-note {
    font-size: 1rem;
  }
  
  .string-freq {
    font-size: 0.65rem;
  }
}