.subtitle-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  height: 100%;
  min-height: 0;
  overflow-y: auto;
  padding-right: 0.25rem;
}

.subtitle-list-container {
  padding-right: 0.25rem;
}

.subtitle-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.subtitle-item {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  margin-bottom: 0.75rem;
  background: var(--surface-color);
}

.subtitle-item:focus,
.subtitle-item:focus-visible {
  outline: 3px solid var(--primary-color) !important;
  outline-offset: -2px !important;
  background-color: #e8f0fe !important;
  box-shadow: 0 0 0 4px var(--focus-ring);
}

.subtitle-item.active-time {
  background-color: #fffde7;
  border-color: #fbc02d;
}

.subtitle-item.invalid-time {
  border-color: var(--danger-color);
  background-color: #fff8f8;
}

.subtitle-item.invalid-time .time-val {
  color: var(--danger-color);
}

.time-adjust-group {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}

.time-adjust-group button {
  padding: 0.15rem 0.35rem;
  font-size: 0.75rem;
  white-space: nowrap;
}

/* ラベルとタイムコード、現在位置ボタンのまとまり */
.time-info-block {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  white-space: nowrap;
}

/* 微調整ボタン群 */
.time-btn-block {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  white-space: nowrap;
}

button.time-clickable {
  background: none;
  border: none;
  padding: 0.1rem 0.2rem;
  margin: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  border-radius: 4px;
  transition: background-color 0.2s;
}

button.time-clickable:hover {
  background-color: #e8f0fe;
  color: var(--primary-color);
}

button.time-clickable:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 1px;
}

.control-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  width: auto;
  flex-shrink: 0;
}

.time-val {
  font-variant-numeric: tabular-nums;
  font-weight: bold;
  font-size: 0.85rem;
  width: 94px;
  display: inline-block;
  flex-shrink: 0;
}

.edit-tc-btn {
  padding: 0.15rem 0.35rem;
  font-size: 0.75rem;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

textarea.sub-text {
  resize: vertical;
  min-height: 44px;
  field-sizing: content;
}

.add-action-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.75rem;
}

.quick-add-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quick-add-controls label {
  margin: 0;
  white-space: nowrap;
}

.quick-add-controls select {
  width: auto;
}

.add-main-btn {
  flex: 1;
  max-width: 50%;
  text-align: center;
  justify-content: center;
  display: inline-flex;
  align-items: center;
}

/* ダイアログ全般 */
.modal-dialog {
  border: none;
  border-radius: 8px;
  padding: 24px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  background-color: #ffffff;
  max-width: 400px;
  width: 90%;
  margin: auto;
  box-sizing: border-box;
}

.modal-dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
}

.dialog-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dialog-title {
  margin: 0;
  font-size: 1.25rem;
  color: #333;
}

.dialog-desc {
  margin: 0;
  font-size: 0.875rem;
  color: #666;
  line-height: 1.4;
}

.dialog-input {
  width: 100%;
  padding: 10px 12px;
  font-size: 1.1rem;
  font-family: monospace;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

.dialog-input:focus {
  outline: none;
  border-color: #0066cc;
  box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.2);
}

.dialog-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 8px;
}

.btn {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.btn-secondary {
  background-color: #e0e0e0;
  color: #333;
}

.btn-secondary:hover {
  background-color: #d0d0d0;
}

.btn-primary {
  background-color: #0066cc;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #0052a3;
}

/* FFmpegダイアログ */
#ffmpeg-dialog {
  max-width: 600px;
}

.ffmpeg-textarea {
  resize: none;
  field-sizing: content;
  min-height: 3em;
  word-break: break-all;
  white-space: pre-wrap;
  font-family: monospace;
}

#ffmpeg-batch-dialog {
  max-width: 800px;
  width: 90vw;
}

.batch-list-container {
  max-height: 250px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem;
  background-color: var(--bg-color);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.batch-item-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  user-select: none;
}

.batch-item-label:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.batch-item-label input[type="checkbox"] {
  width: auto;
  cursor: pointer;
}

.ffmpeg-batch-textarea {
  resize: vertical;
  min-height: 150px;
  font-family: monospace;
  font-size: 0.85rem;
  white-space: pre;
  overflow-x: auto;
}

/* 設定ダイアログ */
.settings-dialog {
  border: none;
  border-radius: 8px;
  padding: 0;
  width: 320px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.settings-dialog::backdrop {
  background: rgba(0, 0, 0, 0.4);
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid #eee;
}

.dialog-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
}

.dialog-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.settings-group {
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 10px 12px;
  margin: 0;
}

.settings-group legend {
  font-size: 0.85rem;
  font-weight: bold;
  padding: 0 4px;
  color: #555;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0;
  font-size: 0.95rem;
  cursor: pointer;
}

.dialog-footer {
  padding: 12px 16px;
  border-top: 1px solid #eee;
  text-align: right;
}

.primary-btn {
  background-color: #0066cc;
  color: white;
  border: none;
  padding: 6px 16px;
  border-radius: 4px;
  cursor: pointer;
}