/* CSS Custom Properties */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a25;
  --text-primary: #e8e8f0;
  --text-secondary: #8888a0;
  --text-muted: #555566;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --border: #2a2a3a;
  --slider-track: #2a2a3a;
  --slider-fill: #6366f1;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Screen reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Base */
html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

/* Visualizer Canvas */
#visualizer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* App Container */
.app {
  position: relative;
  z-index: 1;
  max-width: 480px;
  margin: 0 auto;
  padding: 2rem 1.5rem 120px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
}

/* Mode Selector */
.mode-selector {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 4px;
}

.mode-tab {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.mode-tab:hover {
  color: var(--text-primary);
}

.mode-tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.mode-tab.active {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Mode Panels */
.mode-panel {
  display: none;
  margin-bottom: 1.5rem;
}

.mode-panel.active {
  display: block;
}

.panel-description {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

/* Mood Control (Easy Mode) */
.mood-control {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.mood-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.mood-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.mood-label-left,
.mood-label-right {
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mood-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--slider-track);
  border-radius: 3px;
  cursor: pointer;
  margin-bottom: 1rem;
}

.mood-slider:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.mood-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.mood-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 0 10px var(--accent-glow);
}

.mood-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.mood-slider::-moz-range-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 0 10px var(--accent-glow);
}

.mood-description {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-style: italic;
  min-height: 1.5em;
}

/* Generate Button (Easy Mode) */
.generate-btn {
  display: block;
  width: 100%;
  padding: 1.25rem 2rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px var(--accent-glow);
}

.generate-btn:focus-visible {
  outline: 2px solid var(--accent-hover);
  outline-offset: 2px;
}

.generate-btn:active {
  transform: translateY(0);
}

/* Seed Sound Section (Create Mode) */
.section-title {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.seed-options {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.chord-selector {
  flex: 1;
  min-width: 140px;
}

.chord-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888a0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

.chord-select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.seed-or {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.upload-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.upload-btn {
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.upload-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

.upload-btn:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.upload-filename {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Controls */
.controls {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  flex: 1;
}

/* Hide controls in Easy mode */
.app.mode-easy .controls {
  display: none;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.label-text {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.label-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Slider Styling */
.control-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--slider-track);
  border-radius: 3px;
  cursor: pointer;
}

.control-slider:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.control-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.control-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 0 10px var(--accent-glow);
}

.control-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.control-slider::-moz-range-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 0 10px var(--accent-glow);
}

/* Transport - Floating */
.transport {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  padding: 1.5rem;
  background: linear-gradient(to top, var(--bg-primary) 0%, var(--bg-primary) 60%, transparent 100%);
  z-index: 100;
  pointer-events: none;
}

.transport > * {
  pointer-events: auto;
}

.play-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition);
}

.play-btn:hover {
  border-color: var(--accent);
  background: var(--bg-tertiary);
  transform: scale(1.05);
}

.play-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.play-btn.playing {
  background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
  border-color: transparent;
  box-shadow: 0 0 30px var(--accent-glow);
}

.play-btn.playing:hover {
  background: linear-gradient(135deg, var(--accent-hover) 0%, #a78bfa 100%);
}

.play-icon,
.pause-icon {
  width: 28px;
  height: 28px;
  color: var(--text-primary);
}

.play-icon {
  margin-left: 4px;
}

/* Toggle icon visibility */
.play-btn .pause-icon {
  display: none;
}

.play-btn.playing .play-icon {
  display: none;
}

.play-btn.playing .pause-icon {
  display: block;
}

/* Responsive */
@media (max-width: 480px) {
  .app {
    padding: 1.5rem 1rem;
  }

  .header h1 {
    font-size: 2rem;
  }

  .seed-options {
    flex-direction: column;
    align-items: stretch;
  }

  .seed-or {
    text-align: center;
  }

  .upload-section {
    flex-direction: column;
    align-items: stretch;
  }

  .upload-btn {
    text-align: center;
  }

  .upload-filename {
    max-width: none;
    text-align: center;
  }
}

/* Animation for playing state */
@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 20px var(--accent-glow);
  }
  50% {
    box-shadow: 0 0 40px var(--accent-glow);
  }
}

.play-btn.playing {
  animation: pulse 2s ease-in-out infinite;
}

/* Layers Section */
.layers-section {
  margin-bottom: 1.5rem;
}

.layers-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.layer {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
}

.layer.has-content {
  border-color: var(--accent);
}

.layer-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.layer-number {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.layer.has-content .layer-number {
  background: var(--accent);
  color: var(--text-primary);
}

.layer-name {
  flex: 1;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.layer.has-content .layer-name {
  color: var(--text-primary);
}

.layer-clear {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.layer-clear:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.layer-controls {
  display: flex;
  gap: 0.5rem;
}

.layer-chord {
  flex: 1;
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 12 12'%3E%3Cpath fill='%238888a0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
}

.layer-upload-btn {
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.layer-upload-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

.layer-upload-btn input {
  display: none;
}

/* Layer Volume Control */
.layer-volume {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.volume-label {
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  min-width: 24px;
}

.layer-vol-slider {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 6px;
  background: var(--slider-track);
  border-radius: 3px;
  cursor: pointer;
}

.layer-vol-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--text-primary);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition);
}

.layer-vol-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 0 8px var(--accent-glow);
}

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

.layer-vol-slider::-moz-range-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Keyboard Section */
.keyboard-section {
  margin-bottom: 1.5rem;
}

.keyboard-hint {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.6875rem;
}

.keyboard {
  position: relative;
  display: flex;
  height: 100px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
}

.key {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 0.5rem;
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
}

.key.white {
  flex: 1;
  background: linear-gradient(to bottom, #e8e8f0 0%, #d0d0dc 100%);
  border-right: 1px solid var(--border);
}

.key.white:last-of-type {
  border-right: none;
}

.key.white:hover {
  background: linear-gradient(to bottom, #f0f0f8 0%, #e0e0ec 100%);
}

.key.white.active {
  background: linear-gradient(to bottom, var(--accent-hover) 0%, var(--accent) 100%);
}

.key.black {
  position: absolute;
  top: 0;
  width: 24px;
  height: 60%;
  background: linear-gradient(to bottom, #2a2a3a 0%, #1a1a25 100%);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  z-index: 1;
  justify-content: flex-end;
  padding-bottom: 0.25rem;
}

.key.black:hover {
  background: linear-gradient(to bottom, #3a3a4a 0%, #2a2a35 100%);
}

.key.black.active {
  background: linear-gradient(to bottom, var(--accent) 0%, #4f46e5 100%);
}

.key-label {
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.key.white .key-label {
  color: #555566;
}

.key.black .key-label {
  color: #666677;
}

.key.active .key-label {
  color: var(--text-primary);
}

.note-label {
  font-size: 0.6875rem;
  color: #777788;
  margin-top: 0.125rem;
}

.key.white.active .note-label {
  color: var(--text-primary);
}

.keyboard-instructions {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* Control Stages with Bypass Toggles */
.control-stage {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
}

.control-stage.bypassed {
  opacity: 0.5;
}

.control-stage.bypassed .control-slider {
  pointer-events: none;
}

.stage-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.stage-name {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.control-stage.bypassed .stage-name {
  color: var(--text-muted);
}

/* Bypass Toggle */
.bypass-toggle {
  display: flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.bypass-toggle .toggle-off {
  display: none;
}

.bypass-toggle.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--text-primary);
}

.bypass-toggle.active .toggle-on {
  display: inline;
}

.bypass-toggle.active .toggle-off {
  display: none;
}

.bypass-toggle:not(.active) {
  color: var(--text-muted);
}

.bypass-toggle:not(.active) .toggle-on {
  display: none;
}

.bypass-toggle:not(.active) .toggle-off {
  display: inline;
}

.bypass-toggle:hover {
  border-color: var(--accent);
}

.bypass-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Adjust control group spacing within stages */
.control-stage .control-group {
  margin-bottom: 0.5rem;
}

.control-stage .control-group:last-child {
  margin-bottom: 0;
}

/* Controls section title */
.controls > .section-title {
  margin-bottom: 0.75rem;
}

/* Sequencer Layer */
.sequencer-layer {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(99, 102, 241, 0.1) 100%);
}

.sequencer-layer .layer-number {
  background: var(--accent);
  color: var(--text-primary);
}

.sequencer-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.sequencer-status {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.seq-granular-toggle {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  cursor: pointer;
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.seq-granular-toggle input {
  appearance: none;
  width: 28px;
  height: 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 8px;
  position: relative;
  cursor: pointer;
  transition: all var(--transition);
}

.seq-granular-toggle input::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 10px;
  height: 10px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition);
}

.seq-granular-toggle input:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.seq-granular-toggle input:checked::before {
  left: 14px;
  background: var(--text-primary);
}

.seq-granular-toggle .toggle-label {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.sequencer-layer.recording .sequencer-status {
  color: #ef4444;
}

.sequencer-layer.has-content .sequencer-status {
  color: var(--accent);
}

/* Sequencer Header */
.sequencer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.sequencer-header .section-title {
  margin-bottom: 0;
}

.sequencer-controls {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

/* Quantize Toggle */
.quantize-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.quantize-toggle input {
  appearance: none;
  width: 36px;
  height: 20px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 10px;
  position: relative;
  cursor: pointer;
  transition: all var(--transition);
}

.quantize-toggle input::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition);
}

.quantize-toggle input:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.quantize-toggle input:checked::before {
  left: 18px;
  background: var(--text-primary);
}

.quantize-toggle .toggle-label {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

/* Sequencer Grid */
.sequencer-grid {
  position: relative;
  height: 80px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 0.25rem;
}

.grid-lines {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  pointer-events: none;
}

.grid-line {
  flex: 1;
  border-right: 1px solid var(--border);
}

.grid-line.beat {
  border-right: 1px solid var(--text-muted);
}

.grid-line:last-child {
  border-right: none;
}

.grid-playhead {
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  z-index: 10;
  pointer-events: none;
}

.grid-notes {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.grid-info {
  display: flex;
  padding: 0 0 0.5rem 0;
}

.beat-label {
  flex: 1;
  text-align: center;
  font-size: 0.625rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Note blocks */
.note-block {
  position: absolute;
  height: 28px;
  min-width: 36px;
  background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: grab;
  user-select: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
  z-index: 5;
}

.note-block:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.note-block.dragging {
  cursor: grabbing;
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
  z-index: 20;
  opacity: 0.9;
}

.note-block.playing {
  animation: note-pulse 0.3s ease-out;
}

@keyframes note-pulse {
  0% {
    transform: scale(1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  }
  50% {
    transform: scale(1.15);
    box-shadow: 0 0 20px var(--accent-glow);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  }
}

.note-block .delete-note {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 16px;
  height: 16px;
  background: #ef4444;
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 10px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.note-block:hover .delete-note {
  opacity: 1;
}

/* Responsive adjustments */
@media (max-width: 480px) {
  .keyboard {
    height: 80px;
  }

  .key.black {
    width: 20px;
  }

  .layer-controls {
    flex-direction: column;
  }

  .sequencer-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}