/**
 * Piano Chord Finder - Styles
 * Modern, educational piano learning tool
 */

/* ========================================
   THEME VARIABLES
   ======================================== */
:root {
  --piano-primary: #6366f1;
  --piano-primary-dark: #4f46e5;
  --piano-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --piano-light: #eef2ff;
  --piano-success: #22c55e;
  --piano-warning: #f59e0b;
  --piano-danger: #ef4444;
  --key-white: #ffffff;
  --key-black: #1a1a2e;
  --key-active: #6366f1;
  --key-root: #ef4444;
  --key-third: #22c55e;
  --key-fifth: #3b82f6;
  --key-seventh: #f59e0b;
}

[data-theme="dark"] {
  --piano-light: rgba(99, 102, 241, 0.15);
  --key-white: #e2e8f0;
  --key-black: #0f172a;
}

/* ========================================
   LAYOUT - TWO COLUMN
   ======================================== */
.piano-tool-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
  min-height: calc(100vh - 180px);
}

@media (max-width: 991px) {
  .piano-tool-container {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1rem;
  }
}

/* ========================================
   CONTROL PANEL (Left)
   ======================================== */
.piano-control-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: sticky;
  top: 90px;
  height: fit-content;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
}

@media (max-width: 991px) {
  .piano-control-panel {
    position: relative;
    top: auto;
    max-height: none;
  }
}

/* ========================================
   SEARCH CARD
   ======================================== */
.chord-search-card {
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 0.75rem;
  padding: 1.25rem;
}

.chord-search-input {
  display: flex;
  gap: 0.5rem;
  position: relative;
}

.chord-search-input input {
  flex: 1;
  padding: 0.625rem 0.875rem;
  border: 2px solid var(--border, #e2e8f0);
  border-radius: 0.5rem;
  font-size: 0.95rem;
  background: var(--bg-primary, #fff);
  color: var(--text-primary);
}

.chord-search-input input:focus {
  outline: none;
  border-color: var(--piano-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.chord-search-input button {
  padding: 0.625rem 1rem;
  background: var(--piano-gradient);
  color: white;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: transform 0.2s;
}

.chord-search-input button:hover {
  transform: scale(1.05);
}

/* Autocomplete */
.chord-autocomplete {
  position: absolute;
  top: 100%;
  left: 0;
  right: 50px;
  background: var(--bg-primary, #fff);
  border: 2px solid var(--piano-primary);
  border-top: none;
  border-radius: 0 0 0.5rem 0.5rem;
  max-height: 280px;
  overflow-y: auto;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  display: none;
}

.chord-autocomplete.active {
  display: block;
}

.chord-autocomplete-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
}

.chord-autocomplete-item:hover,
.chord-autocomplete-item.selected {
  background: var(--piano-light);
}

.chord-autocomplete-item .chord-name {
  font-weight: 600;
}

.chord-autocomplete-item .chord-full-name {
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-left: 0.5rem;
}

.chord-autocomplete-empty,
.chord-autocomplete-hint {
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-align: center;
}

.chord-autocomplete-item .chord-difficulty {
  font-size: 0.7rem;
  padding: 0.15rem 0.4rem;
  border-radius: 0.25rem;
  text-transform: capitalize;
}

.chord-autocomplete-item .chord-difficulty.beginner {
  background: rgba(34, 197, 94, 0.15);
  color: #16a34a;
}

.chord-autocomplete-item .chord-difficulty.intermediate {
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
}

.chord-autocomplete-item .chord-difficulty.advanced {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

/* Quick Access */
.quick-access-section {
  margin-top: 1rem;
}

.quick-access-section strong {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.quick-chords-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.quick-chord-btn {
  padding: 0.375rem 0.625rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.quick-chord-btn:hover {
  border-color: var(--piano-primary);
  background: var(--piano-light);
  color: var(--piano-primary);
}

/* Chord Types */
.chord-type-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.chord-type-btn {
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.chord-type-btn:hover {
  border-color: var(--piano-primary);
  color: var(--piano-primary);
}

/* Settings Panel */
.settings-panel {
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.settings-header strong {
  font-size: 0.9rem;
}

.keyboard-hint {
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.settings-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.setting-toggle {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.setting-toggle input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--piano-primary);
}

/* Inversion Card */
.inversion-card {
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
}

.inversion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.inversion-hint {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Hand Selector Card */
.hand-selector-card {
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
}

.hand-selector-card strong {
  display: block;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.hand-buttons {
  display: flex;
  gap: 0.5rem;
}

.hand-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.hand-btn:hover {
  border-color: var(--piano-primary);
}

.hand-btn.active {
  background: var(--piano-gradient);
  color: white;
  border-color: var(--piano-primary);
}

/* Favorites Section */
.favorites-section {
  margin-top: 0.5rem;
}

.favorites-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}

.favorites-btn:hover {
  border-color: var(--piano-primary);
  color: var(--piano-primary);
}

/* Note Colors Legend */
.note-colors-legend {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.note-color {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.note-color::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

.note-color.root::before {
  background: var(--key-root);
}

.note-color.third::before {
  background: var(--key-third);
}

.note-color.fifth::before {
  background: var(--key-fifth);
}

.note-color.seventh::before {
  background: var(--key-seventh);
}

/* Chord Actions Section */
.chord-actions-section {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* Chord Notes Display */
.chord-notes {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: 0.25rem;
}

.chord-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Piano Section */
.piano-section h6 {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
}

/* ========================================
   DISPLAY PANEL (Right)
   ======================================== */
.piano-display-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Welcome Section */
.welcome-section {
  text-align: center;
  padding: 3rem 2rem;
}

.welcome-section h4 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.welcome-section p {
  color: var(--text-secondary);
}

.welcome-tip {
  margin-top: 1.5rem;
  padding: 1rem;
  background: var(--piano-light);
  border-radius: 0.5rem;
  font-size: 0.9rem;
}

/* Chord Display Card */
.chord-display-card {
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

/* Chord Header */
.chord-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.chord-info-box h3 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.chord-meta-info {
  display: flex;
  gap: 1rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.difficulty-badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-left: 0.5rem;
}

.difficulty-beginner {
  background: rgba(34, 197, 94, 0.15);
  color: #16a34a;
}

.difficulty-intermediate {
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
}

.difficulty-advanced {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

/* Play Button */
.play-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--piano-gradient);
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.play-btn:hover {
  transform: scale(1.1);
}

.play-btn.playing {
  animation: pulse-glow 0.5s ease-out;
}

.play-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

@keyframes pulse-glow {
  0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.7); }
  70% { box-shadow: 0 0 0 15px rgba(99, 102, 241, 0); }
  100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
}

/* ========================================
   PIANO KEYBOARD
   ======================================== */
.piano-keyboard-container {
  position: relative;
  margin: 1.5rem 0;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

#pianoKeyboard {
  position: relative;
  min-width: 700px;
  height: 180px;
}

.piano-keys {
  display: flex;
  height: 100%;
}

.piano-key {
  cursor: pointer;
  transition: all 0.1s;
}

.white-key {
  width: 40px;
  height: 160px;
  background: var(--key-white);
  border: 1px solid #ccc;
  border-radius: 0 0 4px 4px;
  position: relative;
  z-index: 1;
}

.white-key:hover {
  background: #f0f0f0;
}

.white-key.active {
  background: linear-gradient(180deg, var(--key-active) 0%, #818cf8 100%);
  border-color: var(--key-active);
}

.white-key.root {
  background: linear-gradient(180deg, var(--key-root) 0%, #f87171 100%);
}

.white-key.third {
  background: linear-gradient(180deg, var(--key-third) 0%, #4ade80 100%);
}

.white-key.fifth {
  background: linear-gradient(180deg, var(--key-fifth) 0%, #60a5fa 100%);
}

.white-key.seventh {
  background: linear-gradient(180deg, var(--key-seventh) 0%, #fbbf24 100%);
}

.white-key.pressed {
  transform: translateY(2px);
  box-shadow: inset 0 3px 5px rgba(0,0,0,0.2);
}

.key-label {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: #666;
  pointer-events: none;
}

.white-key.active .key-label,
.white-key.root .key-label,
.white-key.third .key-label,
.white-key.fifth .key-label,
.white-key.seventh .key-label {
  color: white;
  font-weight: 600;
}

.black-keys-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100px;
  pointer-events: none;
}

.black-key {
  width: 28px;
  height: 100px;
  background: var(--key-black);
  border-radius: 0 0 3px 3px;
  position: absolute;
  z-index: 2;
  pointer-events: auto;
  box-shadow: 0 3px 5px rgba(0,0,0,0.3);
}

.black-key:hover {
  background: #2d2d4a;
}

.black-key.active {
  background: var(--key-active);
}

.black-key.root {
  background: var(--key-root);
}

.black-key.third {
  background: var(--key-third);
}

.black-key.fifth {
  background: var(--key-fifth);
}

.black-key.seventh {
  background: var(--key-seventh);
}

.black-key.pressed {
  transform: translateY(2px);
  height: 98px;
}

/* Black key positions are now set via inline styles in JS */

/* ========================================
   FINGERING SECTION
   ======================================== */
.fingering-section {
  margin-top: 1.5rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: 0.5rem;
}

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

.hand-selector {
  display: flex;
  gap: 0.5rem;
}

.hand-btn {
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--bg-primary);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.hand-btn.active {
  background: var(--piano-primary);
  color: white;
  border-color: var(--piano-primary);
}

.fingering-numbers {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

.finger-note {
  text-align: center;
}

.finger-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--piano-primary);
  color: white;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.finger-note-name {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.fingering-legend {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.fingering-hand {
  text-align: center;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--piano-primary);
}

/* ========================================
   INVERSIONS
   ======================================== */
.inversions-section {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: 0.5rem;
}

.inversions-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.inversions-header strong {
  font-size: 0.9rem;
}

#inversionLabel {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.inversion-buttons {
  display: flex;
  gap: 0.5rem;
}

.inversion-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--bg-primary);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.inversion-btn:hover {
  border-color: var(--piano-primary);
}

.inversion-btn.active {
  background: var(--piano-primary);
  color: white;
  border-color: var(--piano-primary);
}

/* ========================================
   ACTION BUTTONS
   ======================================== */
.chord-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.chord-action-btn {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.chord-action-btn:hover {
  border-color: var(--piano-primary);
  color: var(--piano-primary);
}

/* ========================================
   PROGRESSIONS SECTION
   ======================================== */
.progressions-section {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.progressions-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.progressions-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.progressions-title h2 {
  font-size: 1.25rem;
  margin: 0;
}

.progressions-title p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin: 0;
}

.key-selector select {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--bg-primary);
  font-size: 0.9rem;
}

.progressions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.progression-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
  cursor: pointer;
  transition: all 0.2s;
}

.progression-card:hover {
  border-color: var(--piano-primary);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.progression-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.progression-name {
  font-weight: 600;
}

.progression-genre {
  font-size: 0.7rem;
  padding: 0.15rem 0.4rem;
  background: var(--piano-light);
  color: var(--piano-primary);
  border-radius: 0.25rem;
}

.progression-numerals {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.progression-chords {
  font-weight: 600;
  color: var(--piano-primary);
  margin-bottom: 0.5rem;
}

.progression-description {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.progression-play-btn {
  padding: 0.375rem 0.75rem;
  background: var(--piano-gradient);
  color: white;
  border: none;
  border-radius: 0.375rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: transform 0.2s;
}

.progression-play-btn:hover {
  transform: scale(1.05);
}

/* Full-width Progressions Section (outside tool container) */
.progressions-section-full {
  background: var(--bg-primary, #fff);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 2rem 0;
  margin: 2rem 0;
}

.progressions-section-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.progressions-section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.progressions-title {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.progressions-title svg {
  flex-shrink: 0;
  color: var(--piano-primary);
}

.progressions-title h2 {
  font-size: 1.25rem;
  margin: 0 0 0.25rem 0;
}

.progressions-title p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.key-selector-large {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.key-selector-large label {
  font-size: 0.9rem;
  font-weight: 500;
}

.key-selector-large select {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg-primary);
  font-size: 0.9rem;
  cursor: pointer;
}

.key-selector-large select:focus {
  outline: none;
  border-color: var(--piano-primary);
}

/* ========================================
   DARK MODE
   ======================================== */
[data-theme="dark"] .chord-search-card,
[data-theme="dark"] .settings-panel,
[data-theme="dark"] .chord-display-card,
[data-theme="dark"] .progressions-section {
  background: var(--bg-secondary);
  border-color: var(--border);
}

[data-theme="dark"] .white-key {
  background: linear-gradient(180deg, #e2e8f0 0%, #cbd5e1 100%);
  border-color: #94a3b8;
}

[data-theme="dark"] .white-key:hover {
  background: #d1d5db;
}

[data-theme="dark"] .key-label {
  color: #475569;
}

[data-theme="dark"] .chord-autocomplete {
  background: var(--bg-secondary);
}

/* ========================================
   RESPONSIVE - TABLET
   ======================================== */
@media (max-width: 991px) {
  .piano-two-column-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .piano-control-panel {
    order: 2;
  }

  .piano-main-display {
    order: 1;
  }
}

/* ========================================
   RESPONSIVE - MOBILE
   ======================================== */
@media (max-width: 768px) {
  .piano-tool-container {
    padding: 0.5rem;
  }

  .chord-header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  /* Piano keyboard - smaller keys for mobile */
  .piano-keyboard-container {
    margin: 1rem -0.5rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 10px;
  }

  .piano-keyboard {
    min-width: 600px; /* Allow horizontal scroll */
  }

  .white-key {
    width: 32px;
    height: 120px;
  }

  .black-key {
    width: 22px;
    height: 75px;
  }

  .key-label {
    font-size: 0.65rem;
  }

  /* Control panels */
  .chord-search-card,
  .settings-card,
  .inversion-card,
  .hand-selector-card {
    padding: 0.75rem;
  }

  .chord-search-input input {
    font-size: 16px; /* Prevent zoom on iOS */
  }

  /* Settings toggles - touch friendly */
  .settings-toggles {
    flex-direction: column;
    gap: 0.5rem;
  }

  .setting-toggle {
    padding: 0.75rem;
    min-height: 44px; /* Touch target */
  }

  /* Inversion buttons */
  .inversion-buttons {
    flex-wrap: wrap;
  }

  .inversion-btn {
    min-width: 60px;
    min-height: 44px;
    font-size: 0.85rem;
  }

  /* Hand selector */
  .hand-buttons {
    flex-direction: row;
  }

  .hand-btn {
    min-height: 44px;
    padding: 0.5rem;
  }

  /* Fingering display */
  .fingering-numbers {
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .finger-number {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  /* Chord actions */
  .chord-actions,
  .chord-actions-section {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
  }

  .chord-action-btn,
  .play-btn {
    min-height: 44px;
    padding: 0.5rem 1rem;
  }

  /* Progressions */
  .progressions-grid {
    grid-template-columns: 1fr;
  }

  .progression-card {
    padding: 1rem;
  }

  /* Favorites */
  .favorites-section {
    margin-top: 1rem;
  }

  .favorites-btn {
    width: 100%;
    min-height: 44px;
  }
}

/* ========================================
   RESPONSIVE - SMALL MOBILE
   ======================================== */
@media (max-width: 480px) {
  .piano-tool-container {
    padding: 0.25rem;
  }

  /* Even smaller piano keys */
  .white-key {
    width: 28px;
    height: 100px;
  }

  .black-key {
    width: 18px;
    height: 60px;
  }

  .key-label {
    font-size: 0.55rem;
  }

  /* Stack buttons vertically */
  .chord-actions {
    flex-direction: column;
  }

  .chord-action-btn {
    width: 100%;
  }

  /* Quick chords grid */
  .quick-chords-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.25rem;
  }

  .quick-chord-btn {
    padding: 0.5rem 0.25rem;
    font-size: 0.8rem;
    min-height: 40px;
  }

  /* Chord type buttons */
  .chord-type-selector {
    gap: 0.25rem;
  }

  .chord-type-btn {
    padding: 0.4rem 0.6rem;
    font-size: 0.75rem;
  }
}