body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, sans-serif;
  background: #121212;
  color: #f8fafc;
}

.app {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.drum-kit {
  width: min(720px, 100%);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.drum-button {
  min-height: 88px;
  border: 0;
  border-radius: 8px;
  background: #f59e0b;
  color: #111827;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms ease, background-color 120ms ease;
}

.drum-button:hover {
  background: #fbbf24;
}

.drum-button:active,
.drum-button.is-playing {
  transform: scale(0.98);
  background: #fcd34d;
}