/* ===================================================================
   Drone View — Button Grid UI
   =================================================================== */

#drone-view {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
}

.drone-scroll {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* -------------------------------------------------------------------
   Now playing header
   ------------------------------------------------------------------- */

.drone-now-playing {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-md) var(--space-sm);
}

.drone-now-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.drone-status {
  font-size: clamp(1.25rem, 4vw, 1.75rem);
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-text-dim);
  text-align: center;
  min-height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-base);
}

.drone-status:empty::after {
  content: '\2014'; /* em dash as placeholder */
  opacity: 0.3;
}

.drone-status.active {
  color: var(--color-accent);
}

.drone-now-playing.playing {
  background: rgba(78, 205, 196, 0.04);
  border-radius: var(--radius-md);
}

.drone-now-playing.playing .drone-now-label {
  color: var(--color-accent);
}

/* -------------------------------------------------------------------
   Sections
   ------------------------------------------------------------------- */

.drone-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.drone-section-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-left: var(--space-xs);
}

/* Pads section gets more vertical space */
.drone-section--pads {
  flex: 1;
  gap: var(--space-sm);
}

/* -------------------------------------------------------------------
   Grid buttons (shared)
   ------------------------------------------------------------------- */

.drone-grid-btn {
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 600;
  font-family: var(--font-family);
  cursor: pointer;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.drone-grid-btn:active {
  transform: scale(0.93);
}

/* Selected state (key + octave) */
.drone-grid-btn.selected {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* -------------------------------------------------------------------
   Key grid — 6 columns for compact layout
   ------------------------------------------------------------------- */

.drone-key-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 5px;
}

.drone-key-btn {
  min-height: 40px;
  font-size: var(--font-size-xs);
}

.drone-key-btn.sharp {
  color: var(--color-text-dim);
  background: var(--color-bg);
}

.drone-key-btn.sharp.selected {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* -------------------------------------------------------------------
   Octave grid — compact row directly below key grid
   ------------------------------------------------------------------- */

.drone-octave-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
}

.drone-octave-btn {
  min-height: 36px;
  font-size: var(--font-size-xs);
  font-family: var(--font-mono);
}

/* -------------------------------------------------------------------
   Chord grid — big tappable pads, the main instrument
   ------------------------------------------------------------------- */

.drone-chord-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  flex: 1;
}

.drone-chord-btn {
  min-height: 72px;
  font-size: clamp(0.875rem, 2.5vw, 1.125rem);
  font-weight: 700;
  border-radius: var(--radius-md);
  border-width: 1.5px;
}

/* Jolt flash — bright border pulse */
.drone-chord-btn.flash {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: 0 0 12px rgba(78, 205, 196, 0.2);
}

/* Sustained drone active — solid accent, breathing glow */
.drone-chord-btn.droning {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
  animation: drone-glow 2.5s ease-in-out infinite;
}

@keyframes drone-glow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(78, 205, 196, 0.35), 0 2px 12px rgba(78, 205, 196, 0.15);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(78, 205, 196, 0.08), 0 2px 20px rgba(78, 205, 196, 0.25);
  }
}

/* -------------------------------------------------------------------
   Hint
   ------------------------------------------------------------------- */

.drone-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-dim);
  text-align: center;
  letter-spacing: 0.02em;
  opacity: 0.5;
  padding-top: var(--space-xs);
}