/* ============================================================
   CONTROLS — Buttons, inputs, header bar, seek bar
   ============================================================ */

/* Buttons */
button {
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-radius: var(--r-md);
  padding: var(--sp-2) var(--sp-3);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  white-space: nowrap;
}

button:hover:not(:disabled) {
  background: var(--bg-secondary);
  border-color: var(--accent);
}

button:active:not(:disabled) {
  transform: scale(0.97);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button.primary {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
  font-weight: 600;
}

button.primary:hover:not(:disabled) {
  background: #3ab8df;
  border-color: #3ab8df;
}

button.secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
  font-weight: 400;
}

button.secondary:hover:not(:disabled) {
  color: var(--text-primary);
  border-color: var(--text-muted);
  background: var(--bg-tertiary);
}

/* Inputs */
input[type="number"], select {
  font-family: inherit;
  font-size: var(--fs-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--sp-1) var(--sp-2);
  transition: border-color var(--transition);
  width: 70px;
}

input[type="number"]:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

input[type="range"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Header / Control Bar */
#header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-2) var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  flex-shrink: 0;
  flex-wrap: nowrap;
  overflow-x: auto;
  backdrop-filter: blur(10px);
  z-index: 10;
}

#header::-webkit-scrollbar { height: 4px; }
#header::-webkit-scrollbar-thumb { background: #44475a; border-radius: 2px; }
#header::-webkit-scrollbar-track { background: transparent; }

.control-group {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.control-group-label {
  font-size: var(--fs-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: var(--sp-1);
}

.separator {
  width: 1px;
  height: 24px;
  background: var(--border);
}

#time-display {
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-sm);
  color: var(--text-muted);
  min-width: 140px;
  text-align: right;
}

#time-display .current-time {
  color: var(--text-primary);
  font-weight: 600;
}

#sound-settings-wrap {
  padding: 0 var(--sp-4) var(--sp-2);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#sound-settings-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--sp-2) var(--sp-4);
  width: 100%;
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-tertiary);
}

#sound-settings-panel.hidden {
  display: none;
}

.sound-control-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--sp-2);
}

.sound-control-row label {
  grid-column: 1 / -1;
  font-size: var(--fs-xs);
  color: var(--text-muted);
}

.sound-control-row input[type="range"] {
  width: 100%;
}

.sound-control-row select {
  width: 100%;
  min-width: 130px;
}

.sound-control-row span {
  min-width: 58px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-xs);
  color: var(--text-primary);
}

/* Transport buttons */
.transport-btn {
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.transport-btn.play-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-primary);
  width: 36px;
  height: 36px;
}

.transport-btn.play-btn:hover:not(:disabled) {
  background: #3ab8df;
  border-color: #3ab8df;
}

#transpose-select {
  width: 160px;
}

/* Seek Bar */
#seek-bar-container {
  height: 28px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: relative;
  cursor: pointer;
  flex-shrink: 0;
  overflow: hidden;
}

#seek-density-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#seek-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, rgba(76, 201, 240, 0.15), rgba(76, 201, 240, 0.05));
  border-right: 2px solid var(--accent);
  pointer-events: none;
  transition: none;
}

button[aria-pressed="true"] {
  background: var(--accent, #89b4fa);
  color: #1e1e2e;
  border-color: var(--accent, #89b4fa);
}

/* Responsive */
@media (max-width: 900px) {
  #header {
    flex-wrap: nowrap;
    gap: var(--sp-3);
  }
  #sound-settings-wrap {
    padding: var(--sp-2) var(--sp-3);
  }
  .control-group-label { display: none; }
}