.panel-title {
  padding: 12px;
  border-bottom: 1px solid #fff;
  font-weight: bold;
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

.transport-btn {
  width: 36px;
  height: 32px;
  background: transparent;
  border: 1px solid #fff;
  color: #fff;
  border-radius: 4px;
}

.transport-btn:hover {
  background: #fff;
  color: #000;
}

.time-display,
.beat-display {
  font-variant-numeric: tabular-nums;
}

/* BPM編集ポップアップ */
.bpm-edit-popup {
  position: absolute;
  background: #1c1c1c;
  border: 1px solid #ffffff;
  border-radius: 6px;
  padding: 8px 10px;
  z-index: 20;
  color: #fff;
  font-size: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

.bpm-edit-title {
  margin-bottom: 6px;
  opacity: 0.8;
}

.bpm-edit-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.bpm-btn {
  width: 22px;
  height: 22px;
  background: transparent;
  border: 1px solid #fff;
  color: #fff;
  border-radius: 4px;
}

.bpm-btn:hover {
  background: #fff;
  color: #000;
}

.bpm-input {
  width: 56px;
  background: #000;
  border: 1px solid #fff;
  color: #fff;
  text-align: center;
  border-radius: 4px;
  padding: 2px 4px;
}

.bpm-delete-btn {
  margin-top: 8px;
  width: 100%;
  background: transparent;
  border: 1px solid #ff5f5f;
  color: #ff9f9f;
  border-radius: 4px;
  padding: 4px 0;
}

.bpm-delete-btn:hover {
  background: #ff5f5f;
  color: #000;
}

/* プロパティパネル共通フォーム部品 */
.prop-section-title {
  font-weight: bold;
  margin: 10px 0 6px;
  opacity: 0.85;
}

.prop-row {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 8px;
  font-size: 12px;
}

.prop-row input[type="text"],
.prop-row input[type="number"] {
  background: #000;
  border: 1px solid #fff;
  color: #fff;
  border-radius: 4px;
  padding: 4px 6px;
  width: 100%;
}

.prop-row input[type="range"] {
  width: 100%;
}

.prop-row-inline {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.keymap-row {
  display: grid;
  grid-template-columns: 1fr 44px 84px;
  align-items: center;
  column-gap: 8px;
  padding: 4px 0;
  font-size: 12px;
}

.keymap-key {
  font-family: monospace;
  border: 1px solid #fff;
  border-radius: 4px;
  padding: 2px 4px;
  width: 44px;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.keymap-row .keymap-change-btn {
  width: 84px;
  height: 26px;
  padding: 0 4px;
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.prop-stats-line {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  padding: 2px 0;
}

.danger-btn {
  border-color: #ff5f5f;
  color: #ff9f9f;
}

.danger-btn:hover {
  background: #ff5f5f;
  color: #000;
}

/* アコーディオン（グリッド分割設定など） */
.prop-accordion {
  border: 1px solid #444;
  border-radius: 4px;
  margin-bottom: 10px;
}

.prop-accordion summary {
  padding: 6px 8px;
  cursor: pointer;
  font-size: 12px;
  opacity: 0.9;
  list-style: none;
}

.prop-accordion summary::-webkit-details-marker {
  display: none;
}

.prop-accordion summary::before {
  content: "▶ ";
  font-size: 9px;
}

.prop-accordion[open] summary::before {
  content: "▼ ";
}

.prop-accordion-body {
  padding: 6px 8px 10px;
  border-top: 1px solid #333;
}

.prop-accordion-body select {
  width: 100%;
  background: #000;
  color: #fff;
  border: 1px solid #fff;
  border-radius: 4px;
  padding: 4px;
}

/* レーン数などの[-][数値][+]ステッパー */
.stepper {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stepper-btn {
  width: 26px;
  height: 26px;
  background: transparent;
  border: 1px solid #fff;
  color: #fff;
  border-radius: 4px;
}

.stepper-btn:hover {
  background: #fff;
  color: #000;
}

.stepper-value {
  min-width: 24px;
  text-align: center;
}

.stepper-value-input {
  width: 40px;
  text-align: center;
  background: transparent;
  border: 1px solid transparent;
  color: #fff;
  border-radius: 4px;
  padding: 2px;
}

.stepper-value-input:focus {
  background: #000;
  border-color: #fff;
  outline: none;
}

/* 使い方アコーディオン */
.usage-group-title {
  font-weight: bold;
  font-size: 12px;
  margin: 10px 0 4px;
  opacity: 0.85;
}

.usage-group-title:first-child {
  margin-top: 0;
}

.usage-row {
  display: grid;
  grid-template-columns: 112px 1fr;
  column-gap: 8px;
  align-items: start;
  padding: 3px 0;
  font-size: 12px;
}

.usage-key {
  font-family: monospace;
  border: 1px solid #fff;
  border-radius: 4px;
  padding: 1px 4px;
  text-align: center;
  overflow-wrap: anywhere;
}

.usage-desc {
  line-height: 1.5;
  overflow-wrap: anywhere;
}