/* ============================================================
   D4W.XYZ — Instrument Settings Panels (spec §11)
   ============================================================ */

.instrument-panel {
  height: 100%;
  overflow-y: auto;
  box-sizing: border-box;
  padding: 12px;
}

.synth-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.synth-section {
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  padding: 8px;
}

.synth-master,
.synth-envelope,
.synth-keyboard {
  grid-column: 1 / -1;
}

.synth-master {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

/* ---- Shared preset dropdown (spec item 6) ---- */

.preset-bar {
  display: flex;
  align-items: center;
  gap: 6px;
}

.preset-bar-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.preset-select {
  min-width: 160px;
}

.synth-section h3 {
  margin: 0 0 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.osc2-enable {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.knob-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.adsr-display {
  display: block;
  width: 100%;
  height: 60px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.adsr-curve {
  fill: none;
  stroke: var(--accent-primary);
  stroke-width: 1.5;
}

/* ---- Drum Machine (spec §11.4) ---- */

/* The toolbar sticks to the top of the panel; .drum-rows-scroll is the only
   scrolling region (both axes — vertical for pad rows, horizontal for steps). */
.instrument-panel.drum-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}

.drum-toolbar {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 12px 8px;
  border-bottom: 1px solid var(--border-color);
}

.drum-toolbar-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.drum-pattern-select {
  margin-left: auto;
}

.drum-rows-scroll {
  flex: 1 1 auto;
  overflow: auto;
  padding: 0 12px 12px;
}

.drum-grid {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* Fixed left section (trigger/name/type/knobs) stays pinned while the step
   grid scrolls horizontally — single shared scrollbar on .drum-rows-scroll. */
.drum-row-fixed {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 6px;
  width: 398px;
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--bg-secondary);
}

.drum-header-row {
  display: flex;
  align-items: center;
  padding: 4px 0;
  border-bottom: 1px solid var(--border-color);
}

.drum-header-row .drum-col-knob {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  text-align: center;
}

.drum-pad-row {
  display: flex;
  align-items: center;
  padding: 2px 0;
  border-bottom: 1px solid var(--border-color);
}

.drum-pad-row.dragging {
  opacity: 0.4;
}

.drum-pad-row.drag-over-top {
  box-shadow: inset 0 2px 0 0 var(--accent-primary);
}

.drum-pad-row.drag-over-bottom {
  box-shadow: inset 0 -2px 0 0 var(--accent-primary);
}

/* Sizes shared with the empty header-row placeholders so columns line up. */
.drum-col-drag {
  flex: 0 0 14px;
  width: 14px;
}

.drum-pad-drag-handle {
  flex: 0 0 auto;
  width: 14px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  cursor: grab;
  user-select: none;
}

.drum-pad-drag-handle:active {
  cursor: grabbing;
}

.drum-col-trigger {
  flex: 0 0 22px;
  width: 22px;
}

.drum-col-name {
  flex: 0 0 80px;
  width: 80px;
}

.drum-col-type {
  flex: 0 0 100px;
  width: 100px;
}

.drum-pad-trigger {
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
}

.drum-pad-name {
  width: 80px;
  flex: 0 0 auto;
  font-size: 11px;
}

.drum-pad-type {
  width: 100px;
  flex: 0 0 auto;
  font-size: 11px;
}

.drum-pad-knobs {
  flex: 0 0 auto;
  flex-wrap: nowrap;
  gap: 4px;
  margin-top: 0;
}

.drum-col-knob {
  flex: 0 0 32px;
  width: 32px;
}

.drum-pad-knobs .knob {
  width: 32px;
  gap: 0;
}

.drum-pad-knobs .knob-label {
  display: none;
}

.drum-pad-knobs .knob-svg {
  width: 24px;
  height: 24px;
}

.drum-pad-knobs .knob-value {
  font-size: 9px;
}

.drum-col-mutesolo {
  flex: 0 0 50px;
  width: 50px;
  box-sizing: border-box;
  padding-right: 8px;
}

.drum-pad-mutesolo {
  display: flex;
  gap: 2px;
  flex: 0 0 auto;
}

.drum-pad-mute,
.drum-pad-solo {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  font-size: 10px;
  padding: 0;
}

.drum-pad-mute.active {
  background: var(--danger, #e05050);
  border-color: var(--danger, #e05050);
  color: #fff;
}

.drum-pad-solo.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: var(--bg-primary);
}

.drum-step-grid {
  display: flex;
  flex: 0 0 auto;
  gap: 2px;
}

.drum-step {
  flex: 0 0 18px;
  width: 18px;
  height: 26px;
  padding: 0;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  cursor: pointer;
}

.drum-step.beat-start {
  border-left: 2px solid var(--border-accent);
}

.drum-step.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.drum-step.active.vel-25 { opacity: 0.4; }
.drum-step.active.vel-50 { opacity: 0.6; }
.drum-step.active.vel-75 { opacity: 0.8; }
.drum-step.active.vel-100 { opacity: 1; }

.drum-step.current {
  outline: 2px solid var(--text-primary);
  outline-offset: -1px;
}

/* ---- Piano (spec §11.1) ---- */

.piano-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.piano-controls {
  justify-content: center;
}

.piano-keyboard {
  position: relative;
  height: 140px;
  user-select: none;
}

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

.piano-key-white {
  flex: 1;
  background: #f5f5f0;
  border: 1px solid #333;
  border-radius: 0 0 3px 3px;
  cursor: pointer;
}

.piano-key-white.active {
  background: var(--accent-primary);
}

.piano-black-keys {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 60%;
  pointer-events: none;
}

.piano-key-black {
  position: absolute;
  height: 100%;
  background: #1a1a1a;
  border: 1px solid #000;
  border-radius: 0 0 2px 2px;
  cursor: pointer;
  pointer-events: auto;
  z-index: 2;
}

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

.piano-hint {
  position: relative;
  font-size: 11px;
  color: var(--text-secondary);
  text-align: center;
}

.piano-hint-info {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  margin-left: 4px;
  padding: 0;
  font-size: 11px;
  line-height: 1;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
}

.piano-hint-info:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.piano-hint-popover {
  position: absolute;
  bottom: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  width: 220px;
  padding: 8px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  box-shadow: var(--shadow);
  font-size: 11px;
  text-align: left;
  color: var(--text-primary);
  z-index: 10;
}

.piano-hint-popover a {
  color: var(--accent-primary);
}

.piano-hint-popover.hidden {
  display: none;
}

/* ---- Sampler (spec item 3) ---- */

.sampler-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sampler-drop {
  position: relative;
  height: 100px;
  border: 1px dashed var(--border-color);
  background: var(--bg-tertiary);
  cursor: pointer;
  overflow: hidden;
}

.sampler-drop.drag-over {
  border-color: var(--accent-primary);
  background: var(--accent-glow);
}

.sampler-waveform {
  display: block;
  width: 100%;
  height: 100%;
}

.sampler-file-info {
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 4px;
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  pointer-events: none;
}

.sampler-file-info.sampler-missing {
  color: var(--meter-high);
}

.sampler-controls {
  justify-content: center;
}

.sampler-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--text-primary);
}

.sampler-radio {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.sampler-trim label {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1 1 160px;
}

.sampler-trim input[type="range"] {
  flex: 1 1 auto;
}