body {
  font-family: sans-serif;
  font-size: 10pt;
  padding: 20px;
}

#fretboard {
  display: grid;
  grid-template-rows: repeat(6, 30px);
  gap: 4px;
  margin-top: 20px;
}

.string {
  display: grid;
  grid-template-columns: repeat(25, 50px);
}

.fret {
  border: 1px solid #999;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: #f5f5f5;
}

.fret.selected {
  background: #222;
  color: white;
}

.fret.hidden span {
  visibility: hidden;
}

.fret-marker {
  min-height: 16px;
  align-items: center;
  display: flex;
  justify-content: center;
  gap: 6px;
}

.dot {
  width: 8px;
  height: 8px;
  background: #222;
  border-radius: 50%;
}

#fret-markers {
  display: grid;
  grid-template-columns: repeat(25, 50px);
  margin-top: 6px;
  font-size: 14px;
  color: #444;
}

.fret-marker {
  text-align: center;
}