body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #23272b;
  color: #f1f1f1;
  text-align: center;
  margin: 0;
  padding: 0;
}

#track-container {
  /* display: flex; */
  justify-content: center;
  gap: 24px;
  margin-top: 10px;
}

.track {
  background: #2c3136;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  padding: 24px 16px 16px 16px;
  min-width: 80px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
}

.track label {
  margin-bottom: 12px;
  font-weight: bold;
  letter-spacing: 1px;
}

input[type="range"] {
  width: 120px;
  margin: 16px 0;
  accent-color: #4caf50;
  height: 4px;
}

button {
  background: #4caf50;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 8px;
  margin: 8px 0;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

button:hover {
  background: #388e3c;
}

button.timeline {
  background: #aca066;
  color: #23272b;
}

button.timeline:hover {
  background: #8c7b5a;
}

button.mute {
  background: #f44336;
}

button.mute:hover {
  background: #d32f2f;
}

.back-btn {
  position: absolute;
  top: 1em;
  left: 1em;
  padding: 0.4em 1.2em;
  background: #444;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1em;
}
.back-btn:hover {
    background: #222;
}

@media (max-width: 700px) {
  #track-container {
    flex-direction: column;
    align-items: center;
  }
  .track {
    min-width: 90vw;
    width: 90vw;
  }
}