.tool-main { max-width: 520px; }

.btn-sm    { padding: 0.45rem 0.8rem; font-size: 0.9rem; }
.btn-large { padding: 0.75rem 2.5rem; font-size: 1.1rem; }

/* 振り子 */
.pendulum-card { text-align: center; padding-bottom: 1.25rem; }
.pendulum-wrap {
  position: relative;
  height: 160px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}
.pendulum-pivot {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-sub);
  z-index: 2;
}
.pendulum-rod {
  position: absolute;
  top: 7px;
  left: 50%;
  transform-origin: top center;
  transform: translateX(-50%) rotate(0deg);
  width: 4px;
  height: 130px;
  background: var(--text-sub);
  border-radius: 2px;
  transition: none;
}
.pendulum-rod.swing-left  { animation: swingLeft  var(--beat-dur, 0.5s) ease-in-out forwards; }
.pendulum-rod.swing-right { animation: swingRight var(--beat-dur, 0.5s) ease-in-out forwards; }
@keyframes swingLeft  { from { transform: translateX(-50%) rotate(30deg);  } to { transform: translateX(-50%) rotate(-30deg); } }
@keyframes swingRight { from { transform: translateX(-50%) rotate(-30deg); } to { transform: translateX(-50%) rotate(30deg);  } }
.pendulum-bob {
  position: absolute;
  bottom: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--blue);
  transition: background 0.05s;
}
.pendulum-bob.accent { background: var(--red, #ef4444); }

.beat-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  min-height: 18px;
}
.beat-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.05s;
}
.beat-dot.active { background: var(--blue); }
.beat-dot.accent  { background: var(--red, #ef4444); }

.bpm-display { font-size: 3rem; font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; }
.bpm-label { font-size: 0.85rem; color: var(--text-sub); }

.bpm-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.bpm-row input[type="range"] { flex: 1; }

.bpm-num-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.bpm-num-row label { margin: 0; white-space: nowrap; flex-shrink: 0; }
.bpm-num-row input[type="number"] { max-width: 100px; }

.controls-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1.5rem;
}
@media (max-width: 420px) { .controls-row { grid-template-columns: 1fr; } }

.action-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}