/* ---------- Track pad ---------- */

.track-pad {
  --progress: 0;
  --state-color: var(--accent-empty);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: clamp(6px, 1.4vh, 14px);
  background: linear-gradient(180deg, var(--bg-panel-raised), var(--bg-panel));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
  padding: clamp(10px, 2vh, 18px) 10px 14px;
}

.track-pad[data-state="recording"] { --state-color: var(--accent-recording); }
.track-pad[data-state="overdubbing"] { --state-color: var(--accent-overdub); }
.track-pad[data-state="playing"] { --state-color: var(--track-color); }
.track-pad[data-state="stopped"] { --state-color: var(--accent-stopped); }

.track-pad__main {
  position: relative;
  width: min(60%, 140px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--bg-panel-raised), var(--bg-deep) 75%);
  box-shadow: var(--shadow-pad-out);
  display: grid;
  place-items: center;
  transition: box-shadow 0.12s ease, transform 0.08s ease;
}

.track-pad__main:active {
  box-shadow: var(--shadow-pad-in);
  transform: translateY(4px) scale(0.98);
}

.track-pad__ring {
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  background: conic-gradient(var(--state-color) calc(var(--progress) * 360deg), transparent 0);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 5px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 5px));
  opacity: 0.9;
}

.track-pad[data-state="empty"] .track-pad__ring {
  background: conic-gradient(var(--accent-empty) 0 360deg);
  opacity: 0.35;
}

.track-pad__number {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.track-pad__icon {
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1;
  color: var(--state-color);
}

.track-pad__icon::before { content: "⏺"; }
.track-pad[data-state="recording"] .track-pad__icon::before { content: "⏹"; }
.track-pad[data-state="playing"] .track-pad__icon::before { content: "⏵"; }
.track-pad[data-state="overdubbing"] .track-pad__icon::before { content: "⏺"; }
.track-pad[data-state="stopped"] .track-pad__icon::before { content: "⏵"; }

.track-pad[data-state="recording"] .track-pad__main,
.track-pad[data-state="overdubbing"] .track-pad__main {
  animation: pad-pulse 1s ease-in-out infinite;
}

.track-pad__status {
  font-size: clamp(10px, 1.4vw, 12px);
  color: var(--text-muted);
  text-align: center;
  min-height: 1.4em;
}

.track-pad__controls {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.track-pad__btn {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg-panel);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.4);
  font-size: 12px;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  transition: background 0.15s ease, color 0.15s ease, transform 0.08s ease;
}

.track-pad__btn:active {
  transform: translateY(2px);
}

.track-pad__btn:disabled {
  opacity: 0.3;
  cursor: default;
}

.track-pad__btn--mute.is-active {
  background: var(--accent-danger);
  color: #fff;
}

.track-pad__volume {
  flex: 1 1 auto;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--bg-deep);
  outline: none;
}

.track-pad__volume::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--state-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  cursor: pointer;
}

.track-pad__volume::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: var(--state-color);
  cursor: pointer;
}

.track-pad.is-muted { opacity: 0.55; }

/* ---------- Transport bar ---------- */

.transport {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: linear-gradient(180deg, var(--bg-panel-raised), var(--bg-panel));
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

.transport__title {
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 15px;
  color: var(--text-primary);
}

.transport__loop-length {
  font-size: 11px;
  color: var(--text-muted);
}

.transport__group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.transport__btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-panel);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.4);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: transform 0.08s ease, color 0.15s ease;
}

.transport__btn:active { transform: translateY(2px); }

.transport__icon { width: 10px; height: 10px; border-radius: 3px; background: currentColor; }

.transport__btn--play { color: var(--accent-playing); }
.transport__btn--stop { color: var(--accent-stopped); }
.transport__btn--clear { color: var(--accent-danger); }
.transport__btn--metronome.is-active { color: var(--accent-overdub); }
.transport__btn--metronome.is-active .transport__icon { animation: pad-pulse 0.6s ease-in-out infinite; }

.bpm {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-panel);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
}

.bpm__btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg-panel-raised);
  font-size: 16px;
}

.bpm__display {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 46px;
}

.bpm__value { font-size: 16px; font-weight: 700; }
.bpm__unit { font-size: 9px; color: var(--text-muted); letter-spacing: 0.1em; }

/* ---------- Level meter ---------- */

.level-meter {
  width: 90px;
}

.level-meter__track {
  height: 6px;
  border-radius: 3px;
  background: var(--bg-panel);
  overflow: hidden;
}

.level-meter__fill {
  --level: 0;
  height: 100%;
  width: calc(var(--level) * 100%);
  background: linear-gradient(90deg, var(--accent-playing), var(--accent-overdub) 70%, var(--accent-recording));
  transition: width 0.05s linear;
}

/* ---------- Start overlay ---------- */

.start-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 50% 30%, #1b1f26, var(--bg-deep) 70%);
  transition: opacity 0.4s ease;
}

.start-overlay.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.start-overlay__panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
  padding: 32px;
}

.start-overlay__logo {
  font-size: clamp(28px, 6vw, 44px);
  letter-spacing: 0.14em;
  font-weight: 800;
  color: var(--text-primary);
}

.start-overlay__tagline {
  color: var(--text-muted);
  max-width: 320px;
}

.start-overlay__button {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--bg-panel-raised), var(--bg-deep) 75%);
  box-shadow: var(--shadow-pad-out), 0 0 0 3px var(--accent-recording);
  color: var(--accent-recording);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.1em;
  animation: start-glow 1.8s ease-in-out infinite;
}

.start-overlay__button:active {
  box-shadow: var(--shadow-pad-in);
}

.start-overlay__button:disabled {
  animation: none;
  opacity: 0.6;
}

.start-overlay__status {
  color: var(--text-muted);
  font-size: 13px;
  min-height: 1.4em;
  max-width: 280px;
}