html, body, #app-wrapper, .main-content {
  height: 100%; min-height: 0; min-width: 0;
  margin: 0; padding: 0; box-sizing: border-box;
}
#app-wrapper { display: flex; flex-direction: column; height: 100vh; }
.controls-bar {
  width: 100vw;
  box-sizing: border-box;
  padding: 0.5vmin 0.5vmin 0 0.5vmin;
  background: #faf8f0;
  display: none;
  flex-direction: row;
  justify-content: center;
  align-items: stretch;
  gap: 1.5vw;
  border-bottom: 1px solid #eee;
  z-index: 10;
  flex-shrink: 0;
  flex-grow: 0;
  flex-basis: auto;
  transition: flex-direction 0.2s;
}
.main-content {
  flex: 1 1 0;
  display: flex; flex-direction: column;
  min-height: 0; min-width: 0; height: 100%;
  overflow: hidden; position: relative;
}
.proportional-grid-wrapper {
  flex: 1 1 0;
  min-height: 0; min-width: 0;
  display: flex; align-items: center; justify-content: center;
  position: relative; width: 100vw; overflow: hidden;
}
.grid {
  position: relative;
  width: 100%; height: 100%;
}
.cell, .note-button {
  border-radius: 1vmin;
  position: absolute;
  display: flex; justify-content: center; align-items: center;
  font-weight: bold;
  color: white;
  user-select: none;
  transition: transform 0.1s, background-color 0.3s, font-size 0.2s;
  outline: none;
  min-width: 0; min-height: 0;
  background: transparent;
  z-index: 1;
  font-family: 'EB Garamond', Garamond, 'Times New Roman', Times, serif;
  letter-spacing: 0.02em;
}
.note-button { z-index: 2; }
.active { transform: scale(1.30); }
.control-area {
  outline: none;
  border-radius: 0.8vmin;
  display: flex; align-items: center; justify-content: center;
  font-size: clamp(1rem, min(2.8vw, 2.8vh, 2em), 2em);
  padding: 0.3em 1em;
  background: #fff;
  white-space: nowrap;
  margin: 0;
  font-family: inherit;
}
.control-area.selected {
  box-shadow: 0 0 0 0.6vmin #444a, 0 1px 8px #0002;
  background: #ffff;
}
.arrow {
  cursor: pointer;
  padding: 0.2em 0.5em;
  user-select: none;
  font-size: inherit;
  font-family: inherit;
}
.volume-control {
  display: flex; align-items: center; justify-content: center;
  gap: 0.5vw;
  font-size: clamp(1rem, min(2.2vw, 2.2vh, 1.2em), 1.2em);
  user-select: none;
  padding: 0.1em 0.6em;
  background: #fff;
  border-radius: 0.8vmin;
  margin: 0;
  font-family: inherit;
}
.volume-slider {
  width: min(16vw, 140px);
  accent-color: #007AFF;
  cursor: pointer;
  min-width: 60px;
  max-width: 180px;
}
.volume-label { font-weight: bold; margin-right: 0.3em; }
.volume-value {
  width: 3.2em;
  text-align: left;
  color: #444;
  font-variant-numeric: tabular-nums;
  font-size: 1em;
  margin-left: 0.3em;
  letter-spacing: 0.04em;
}
.cell img.solfege-img {
  max-width: 80%;
  max-height: 80%;
  width: auto;
  height: auto;
  display: block;
  pointer-events: none;
  user-select: none;
  margin: auto;
  background: transparent;
}
/* New style for the scale dropdown */
.scale-select {
  font-family: inherit;
  font-size: 0.9em;
  border-radius: 0.5vmin;
  border: 1px solid #ccc;
  background: #fff;
  padding: 0.2em 0.4em;
  cursor: pointer;
}

/* Chord toggle button (C/I) in grid cell */
.chord-toggle-btn {
  font-family: 'EB Garamond', Garamond, 'Times New Roman', Times, serif;
  font-weight: bold;
  font-size: 2em;
  background: transparent;
  border: none;
  color: #222;
  width: 100%;
  height: 100%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
  transition: background 0.15s, color 0.15s, font-size 0.15s;
}
.chord-toggle-btn:focus {
  outline: 2px solid #007AFF;
  background: #f4f8ff;
}

/* Light grey border for the cell containing the toggle button */
.toggle-cell-border {
  border: 2.5px solid #ddd !important;
  box-sizing: border-box;
}

@media (max-width: 550px) {
  .controls-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-bottom: 0;
    padding-top: 0;
  }
  .control-area, .volume-control {
    width: 100%;
    margin: 0;
    border-radius: 0;
    border-top: none;
    border-bottom: 1px solid #eee;
    background: #fff;
    justify-content: center;
    min-height: 0;
    min-width: 0;
    font-size: clamp(1rem, min(2.5vw, 2.5vh, 1.5em), 1.5em);
  }
  .controls-bar > *:last-child {
    border-bottom: none !important;
  }
}