* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --accent: #e94560;
  --accent-hover: #ff6b6b;
  --text-primary: #eaeaea;
  --text-secondary: #a0a0a0;
  --text-muted: #666;
  --success: #4ade80;
  --warning: #fbbf24;
  --border: rgba(255, 255, 255, 0.1);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  text-align: center;
  padding: 32px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.app-title {
  font-size: 28px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.app-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 16px;
  padding: 48px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--bg-secondary);
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(233, 69, 96, 0.05);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.drop-icon {
  width: 64px;
  height: 64px;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.drop-zone:hover .drop-icon {
  color: var(--accent);
}

.drop-text {
  font-size: 18px;
  font-weight: 500;
  color: var(--text-primary);
}

.drop-subtext {
  font-size: 14px;
  color: var(--text-secondary);
}

.supported-formats {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Waveform Section */
.waveform-section {
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.file-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.file-name {
  font-size: 14px;
  color: var(--text-secondary);
  font-family: monospace;
}

.btn-icon {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: background 0.2s ease;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
}

.waveform {
  height: 128px;
  background: var(--bg-primary);
  border-radius: 8px;
  overflow: hidden;
}

/* Controls */
.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

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

.btn-primary {
  background: var(--accent);
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.btn-primary svg {
  width: 20px;
  height: 20px;
  color: white;
}

.time-display {
  font-family: monospace;
  font-size: 14px;
  color: var(--text-secondary);
}

.time-separator {
  color: var(--text-muted);
}

.segment-info {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-primary);
  border-radius: 8px;
}

.segment-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.segment-time {
  font-family: monospace;
  font-size: 14px;
  color: var(--accent);
}

.segment-separator {
  color: var(--text-muted);
}

/* Time Signature Controls */
.time-signature-group {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: var(--bg-primary);
  border-radius: 8px;
}

.time-sig-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.time-sig-select {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s ease;
}

.time-sig-select:hover,
.time-sig-select:focus {
  border-color: var(--accent);
}

.tune-presets {
  display: flex;
  gap: 6px;
}

.btn-preset {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-preset:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent);
  color: var(--text-primary);
}

.btn-preset.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* Granularity Slider */
.granularity-group {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-primary);
  border-radius: 8px;
}

.granularity-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.granularity-slider {
  width: 80px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-tertiary);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.granularity-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.granularity-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.granularity-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

.granularity-value {
  font-size: 11px;
  color: var(--text-secondary);
  min-width: 70px;
  text-align: left;
}

.btn-analyze {
  background: linear-gradient(135deg, var(--accent), #ff6b6b);
  border: none;
  border-radius: 12px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.btn-analyze:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.4);
}

.btn-analyze:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-analyze svg {
  width: 18px;
  height: 18px;
}

.hint {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 26, 46, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  z-index: 100;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-text {
  font-size: 16px;
  color: var(--text-secondary);
}

/* Results Section */
.results-section {
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.results-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.key-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-primary));
  border-radius: 16px;
}

.key-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.key-value {
  font-size: 48px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.confidence-bar {
  width: 200px;
  height: 6px;
  background: var(--bg-primary);
  border-radius: 3px;
  overflow: hidden;
}

.confidence-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 3px;
  transition: width 0.5s ease;
}

.confidence-text {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Chords */
.chords-result {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chords-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.chord-timeline {
  position: relative;
  overflow: hidden;
  padding: 16px 0;
  cursor: grab;
  user-select: none;
}

.chord-timeline:active {
  cursor: grabbing;
}

.chord-carousel {
  display: flex;
  gap: 12px;
  transition: transform 0.4s ease-out;
  padding: 0 calc(50% - 60px);
}

.chord-carousel::before,
.chord-carousel::after {
  content: '';
  flex-shrink: 0;
  width: 1px;
}

.chord-timeline::before,
.chord-timeline::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 60px;
  pointer-events: none;
  z-index: 10;
}

.chord-timeline::before {
  left: 0;
  background: linear-gradient(to right, var(--bg-secondary), transparent);
}

.chord-timeline::after {
  right: 0;
  background: linear-gradient(to left, var(--bg-secondary), transparent);
}

.chord-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 16px;
  background: var(--bg-primary);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
  min-width: 80px;
  flex-shrink: 0;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease, opacity 0.3s ease;
  opacity: 0.6;
}

.chord-item-active,
.chord-item:hover {
  opacity: 1;
}

.chord-item:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.2);
}

.chord-item:active {
  transform: scale(0.98);
}

.chord-item-active {
  background: var(--bg-tertiary);
  border-left-color: var(--success);
  box-shadow: 0 0 20px rgba(74, 222, 128, 0.3), 0 4px 12px rgba(74, 222, 128, 0.2);
  transform: translateY(-2px) scale(1.02);
}

.chord-item-active .chord-name {
  color: var(--success);
}

.chord-item-active .chord-note-root {
  background: rgba(74, 222, 128, 0.2);
  color: var(--success);
}

.chord-item-active .chord-roman {
  background: rgba(74, 222, 128, 0.2);
  color: var(--success);
}

.chord-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.chord-roman {
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  background: rgba(233, 69, 96, 0.15);
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.chord-notes {
  display: flex;
  gap: 6px;
  margin: 4px 0;
}

.chord-note {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 2px 6px;
  background: var(--bg-secondary);
  border-radius: 4px;
}

.chord-note-root {
  color: var(--accent);
  background: rgba(233, 69, 96, 0.15);
  font-weight: 600;
}

/* Mandolin Tab */
.mando-tab {
  margin: 8px 0;
  padding: 6px 8px;
  background: var(--bg-secondary);
  border-radius: 6px;
}

.mando-tab-unknown {
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
}

.mando-strings {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: monospace;
  font-size: 11px;
}

.mando-string {
  display: flex;
  align-items: center;
  gap: 6px;
}

.mando-string-name {
  color: var(--text-muted);
  width: 12px;
  text-align: right;
}

.mando-fret {
  color: var(--text-primary);
  background: var(--bg-primary);
  padding: 1px 6px;
  border-radius: 3px;
  min-width: 18px;
  text-align: center;
}

.chord-time {
  font-size: 11px;
  font-family: monospace;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Footer */
.footer {
  text-align: center;
  padding: 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  .playback-controls {
    justify-content: center;
  }

  .segment-info {
    justify-content: center;
  }

  .time-signature-group {
    flex-wrap: wrap;
    justify-content: center;
  }

  .tune-presets {
    width: 100%;
    justify-content: center;
    margin-top: 8px;
  }

  .granularity-group {
    justify-content: center;
  }

  .btn-analyze {
    justify-content: center;
  }

  .header {
    padding: 24px 16px;
  }

  .app-title {
    font-size: 24px;
  }

  .main-content {
    padding: 16px;
  }
}