.pm-keys {
  display: flex;
  justify-content: center;
  gap: 4px;
  max-width: 420px;
  margin: 1rem auto;
  height: 140px;
}
.pm-key {
  flex: 1;
  max-width: 48px;
  border: 1px solid #333;
  border-radius: 0 0 6px 6px;
  background: #fafafa;
  color: #222;
  font-weight: 700;
  cursor: pointer;
  padding: 0;
  transition: background 0.08s, transform 0.08s;
}
.pm-key.lit {
  background: var(--accent, #0a7a6f);
  color: #fff;
  transform: translateY(2px);
}
.pm-key:disabled {
  opacity: 0.7;
  cursor: default;
}