:root {
  color-scheme: light dark;
  font-family: "Segoe UI", "Helvetica Neue", system-ui, -apple-system,
    BlinkMacSystemFont, sans-serif;
  --string-label-width: clamp(32px, calc(3vw + 12px), 60px);
  --fret-min-width: clamp(11px, calc(2.1vw + 5px), 38px);
}

body {
  margin: 0;
  padding: 32px 20px 60px;
  background: #f5f5f5;
  color: #1f2933;
}


.app {
  max-width: 1200px;
  margin: 0 auto;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 0.4rem;
}

p.description {
  color: #4b5563;
  margin-top: 0;
  margin-bottom: 1.5rem;
}

button {
  cursor: pointer;
  background: #2563eb;
  color: #fff;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  transition: background 0.15s ease;
}

button:hover {
  background: #1d4ed8;
}

.helper-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 1.25rem;
}

.helper-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.helper-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: #374151;
  min-width: 64px;
}

.selection-panel .helper-group + .helper-group {
  margin-top: 4px;
}

.helper-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.helper-button {
  background: #e5e7eb;
  color: #111827;
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.82rem;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.helper-button:hover {
  background: #d1d5db;
}

.helper-button.selected {
  background: #2563eb;
  color: #fff;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.helper-button.selected:hover {
  background: #1d4ed8;
}

.helper-button.primary {
  background: #f87171;
  color: #fff;
}

.helper-button.primary:hover {
  background: #ef4444;
}

.helper-buttons.notes {
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: stretch;
}

.note-row {
  display: flex;
  flex-direction: row;
  gap: 6px;
  align-items: stretch;
}

.helper-button.natural {
  height: 56px;
  min-width: 52px;
  font-size: 0.95rem;
}

.accidental-stack {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.helper-button.accidental {
  height: 28px;
  min-width: 50px;
  font-size: 0.75rem;
}

.status {
  font-size: 0.95rem;
  color: #111827;
  margin: 4px 0 0;
}

.status.error {
  color: #b91c1c;
}

.selection-summary {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 1.25rem;
}

.current-chord {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 14px;
  background: #eef2ff;
}

.current-chord-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #4b5563;
}

.current-chord-value {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #111827;
}

.helper-panel.display-panel {
  margin-top: 1rem;
}

.radio-option {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid #cfd8ea;
  font-size: 0.85rem;
  background: #fff;
}

.radio-option input {
  margin: 0;
}

.board-wrapper {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 10px 50px rgba(15, 23, 42, 0.1);
  padding: 12px 12px 18px;
  overflow-x: auto;
  width: auto;
  max-width: 1200px;
  margin: 0 auto;
}

.fret-numbers,
.string-row {
  display: grid;
  grid-template-columns: minmax(var(--string-label-width), 1fr)
    repeat(20, minmax(var(--fret-min-width), 1fr));
  column-gap: 0;
  align-items: center;
}

.fret-numbers {
  margin-bottom: 0;
  font-size: 0.8rem;
  color: #6b7280;
  text-align: center;
}

.fret-number {
  font-variant-numeric: tabular-nums;
  padding: 10px 0;
  border-left: none;
  text-align: center;
}

.string-label {
  text-align: right;
  padding-right: clamp(8px, 1.5vw, 16px);
  font-weight: 600;
  color: #1f2937;
}

.string-row {
  position: relative;
  padding: 0;
}

.string-row::before {
  content: "";
  position: absolute;
  left: var(--string-label-width);
  right: 0;
  top: 50%;
  height: 2px;
  background: #000;
  pointer-events: none;
  z-index: 2;
}

.fret {
  position: relative;
  min-height: clamp(29px, 4.6vw, 40px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-left: 1px solid #d5d9e8;
  font-weight: 600;
  font-size: clamp(0.7rem, 1.8vw, 0.9rem);
  color: #111827;
}

.string-row .fret:first-of-type,
.string-row .fret:nth-of-type(2) {
  border-left: none;
}

.fret-number:first-of-type,
.fret-number:nth-of-type(2) {
  border-left: none;
}

.fret:last-child {
  border-right: 1px solid #d5d9e8;
}

.fret[data-fret="0"] {
  border-right: 2px solid #111827;
}

.fret-overlay {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
}

.fret-overlay::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: clamp(18px, 4vw, 28px);
  height: clamp(18px, 4vw, 28px);
  border-radius: 50%;
  background: #111827;
  transform: translate(-50%, -50%) scale(0.9);
  opacity: 0;
  transition: opacity 0.15s ease, transform 0.15s ease;
  -webkit-print-color-adjust: exact;
  print-color-adjust: exact;
  z-index: 4;
}

.fret-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  color: #111827;
  font-size: clamp(0.65rem, 1.6vw, 0.85rem);
  letter-spacing: 0.01em;
  line-height: 1.15;
  opacity: 0;
  transition: opacity 0.15s ease, background 0.15s ease, color 0.15s ease;
  -webkit-print-color-adjust: exact;
  print-color-adjust: exact;
  z-index: 5;
}

.fret.has-label .fret-label {
  opacity: 1;
}

.fret.active .fret-overlay::before {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.fret.active .fret-label {
  background: transparent;
  box-shadow: none;
  color: #fff;
}

.fret.active.root-emphasis .fret-overlay::before {
  background: #b91c1c;
}

.fret.active.root-emphasis .fret-label {
  color: #fff;
}

footer {
  margin-top: 24px;
  font-size: 0.85rem;
  color: #6b7280;
}

.cookie-banner {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  max-width: 420px;
  width: calc(100% - 40px);
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 18px;
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.2);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.cookie-banner[hidden] {
  display: none;
}

.cookie-banner h2 {
  margin: 0 0 4px;
  font-size: 1rem;
}

.cookie-banner p {
  margin: 0;
  font-size: 0.85rem;
  color: #374151;
  line-height: 1.5;
}

.cookie-choice {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cookie-choice button {
  width: 100%;
}

.cookie-preferences[hidden] {
  display: none;
}

.cookie-preferences {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cookie-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cookie-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 12px;
  background: #f3f4f6;
  font-size: 0.9rem;
  color: #111827;
}

.cookie-option input {
  margin: 0;
}

.cookie-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.cookie-actions button {
  flex: 1 1 120px;
  min-width: 120px;
}

button.ghost {
  background: #e5e7eb;
  color: #111827;
}

button.ghost:hover {
  background: #d1d5db;
}

.cookie-note {
  font-size: 0.75rem;
  color: #6b7280;
}

button.secondary {
  background: #fff;
  color: #1f2933;
  border: 1px solid rgba(15, 23, 42, 0.2);
}

button.secondary:hover {
  background: #f9fafb;
}

@media (max-width: 600px) {
  .cookie-banner {
    right: 12px;
    left: 12px;
    width: auto;
  }
}

@media (max-width: 720px) {
  body {
    padding: 20px 12px 40px;
  }

  .current-chord {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .current-chord-value {
    font-size: 1.3rem;
  }
}

@media (min-width: 768px) {
  .selection-summary {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .selection-summary .status {
    text-align: right;
  }
}

@media (max-height: 520px) {
  body {
    margin: 0;
    padding: 0 10px 24px;
  }


  h1 {
    position: absolute;
    top: 0px;
    left: 0px;
    margin: 0;
    padding: 4px 8px;
    font-size: 1rem;
    background: rgba(226, 232, 240, 0.9);
    border-radius: 0;
    z-index: 5;
  }

  .app-body {
    margin-top: 36px;
  }

  p.description {
    display: none;
  }

  .selection-panel {
    margin-top: 12px;
  }

  .helper-panel {
    margin-bottom: 0.75rem;
  }

  .selection-summary {
    margin-bottom: 0.8rem;
  }

  .board-wrapper {
    padding: 8px 8px 12px;
  }

  footer {
    margin-top: 12px;
  }
}