.merge2md-container {
  --button-base-height: var(--ms-tool-control-height);
  --button-width: var(--ms-tool-control-width);
}

.merge2md-container #supported-formats {
  background: #e8f4f8;
  border: 1px solid var(--ms-tool-primary);
  border-radius: var(--ms-tool-radius);
  padding: 0.75rem;
  margin-bottom: 1rem;
  font-size: 0.85rem;
}

.merge2md-container .format-category {
  margin-bottom: 0.5rem;
}

.merge2md-container .format-list {
  color: var(--ms-tool-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.merge2md-container #info-panel {
  background: var(--ms-tool-surface-muted);
  border: 1px solid var(--ms-tool-border);
  border-radius: 4px;
  padding: 0.75rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.merge2md-container .info-item {
  margin: 0.25rem 0;
}

.merge2md-container #progress-container {
  display: none;
  margin-bottom: 1rem;
}

.merge2md-container #progress-bar {
  width: 100%;
  height: 20px;
  background: #f0f0f0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--ms-tool-border);
}

.merge2md-container #progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--ms-tool-primary), var(--ms-tool-success));
  width: 0%;
  transition: width 0.3s ease;
  border-radius: 10px;
}

.merge2md-container #progress-text {
  text-align: center;
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--ms-tool-muted);
}

.merge2md-container #dropZone {
  border: 2px dashed var(--ms-tool-primary);
  border-radius: var(--ms-tool-radius);
  padding: 32px;
  text-align: center;
  color: var(--ms-tool-primary);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.25s;
  margin-bottom: 1rem;
}

.merge2md-container #dropZone.dragover {
  background: #f0f6ff;
}

.merge2md-container #file-input {
  display: none;
}

.merge2md-container #file-list-header {
  display: none;
  margin-bottom: 0.5rem;
  padding: 0.5rem;
  background: var(--ms-tool-surface-muted);
  border-radius: 4px;
  font-size: 0.9rem;
  color: var(--ms-tool-muted);
}

.merge2md-container #file-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.merge2md-container #file-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0.25rem 0;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--ms-tool-border);
  border-radius: 4px;
  background: #fafafa;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.merge2md-container #file-list li.dragging {
  opacity: 0.5;
}

.merge2md-container .file-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 0.5rem;
  min-width: 150px;
}

.merge2md-container .encoding-control {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-shrink: 0;
}

.merge2md-container .encoding-select {
  min-width: 90px;
  border: 1px solid var(--ms-tool-border);
  border-radius: 3px;
  padding: 2px 4px;
  background: #fff;
  font-size: 12px;
}

.merge2md-container .item-buttons {
  display: inline-flex;
  gap: 0.2rem;
  flex-shrink: 0;
}

.merge2md-container .order-btn {
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 4px;
  background: #ccc;
  color: #333;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  transition: background 0.2s ease, opacity 0.2s ease, transform 0.08s ease;
}

.merge2md-container .order-btn:hover {
  background: #bbb;
}

.merge2md-container .order-btn:active {
  transform: scale(0.94);
}

.merge2md-container .controls {
  margin-bottom: 1rem;
}

.merge2md-container .button {
  height: var(--button-base-height);
  width: var(--button-width);
}

.merge2md-container #output {
  min-height: 50vh;
  height: 50vh;
  resize: vertical;
  white-space: pre-wrap;
}