/* ============================================================
   D4W.XYZ — Piano Roll (spec §9)
   ============================================================ */

.piano-roll {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.piano-roll-toolbar {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 6px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.pr-select {
  background: var(--button-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  font-size: 12px;
}

.pr-btn-group {
  display: flex;
  gap: 0;
}

.pr-tool.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: var(--bg-primary);
}

.pr-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--text-secondary);
}

/* Pattern : Instrument group (spec follow-up, 0.10.12) — leftmost in the
   toolbar, mirroring the more hierarchical "pattern contains instrument
   tracks" relationship. */
.pr-pattern-instrument {
  display: flex;
  align-items: center;
  gap: 4px;
}

.pr-toolbar-sep {
  color: var(--text-secondary);
  font-size: 12px;
}

/* Scale highlighting popover (spec item 3) */
.pr-scale-highlight {
  position: relative;
}

.pr-hl-toggle.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: var(--bg-primary);
}

.pr-vel-toggle.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: var(--bg-primary);
}

.pr-scale-popover {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  width: 180px;
}

.pr-scale-popover.hidden {
  display: none;
}

.pr-scale-enable {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-primary);
}

.pr-scale-columns {
  display: flex;
  gap: 6px;
}

.pr-scale-col {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.pr-scale-option {
  background: var(--button-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 3px 4px;
  font-size: 11px;
  cursor: pointer;
  text-align: left;
}

.pr-scale-option.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: var(--bg-primary);
}

.pr-scale-color-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-secondary);
}

.pr-scale-color-row input[type="color"] {
  width: 32px;
  height: 22px;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  background: none;
  cursor: pointer;
}

.pr-pattern-select {
  max-width: 160px;
}

.piano-roll-body {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 56px 1fr;
  grid-template-rows: 24px 1fr;
  min-height: 0;
  overflow: hidden;
}

.piano-roll-corner {
  grid-column: 1;
  grid-row: 1;
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.piano-roll-ruler-wrap {
  grid-column: 2;
  grid-row: 1;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
}

.piano-roll-keys-wrap {
  grid-column: 1;
  grid-row: 2;
  width: 56px;
  overflow: hidden;
  border-right: 1px solid var(--border-color);
}

.piano-roll-grid-wrap {
  grid-column: 2;
  grid-row: 2;
  overflow: auto;
  position: relative;
}

.piano-roll-velocity-row {
  flex: 0 0 auto;
  display: flex;
  height: 80px;
  border-top: 1px solid var(--border-color);
}

.piano-roll-velocity-spacer {
  flex: 0 0 auto;
  border-right: 1px solid var(--border-color);
}

.piano-roll-velocity-wrap {
  flex: 1 1 auto;
  overflow: hidden;
}

.pr-keys,
.pr-grid,
.pr-velocity,
.pr-ruler {
  display: block;
}

.pr-ruler {
  cursor: pointer;
}