/* ── Agent UI Styles ────────────────────────────────── */
/* Plan cards, diff notifications, @-mention dropdown, mode toggle, model selector */

/* ── Mode Toggle ──────────────────────────────────── */

.chat-input-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 0 var(--space-1);
  margin-bottom: var(--space-2);
}

.chat-mode-toggle {
  display: flex;
  gap: 1px;
  background: var(--color-bg-primary);
  border-radius: var(--radius-md);
  padding: 2px;
  border: 1px solid var(--color-border-subtle);
}

.mode-btn {
  padding: var(--space-1) var(--space-2);
  font-size: 10px;
  font-weight: var(--font-medium);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  background: none;
  border: none;
  border-radius: calc(var(--radius-md) - 2px);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-btn:hover {
  color: var(--color-text-secondary);
  background: var(--color-bg-hover);
}

.mode-btn.active {
  color: var(--color-accent-text);
  background: var(--color-accent-subtle);
}

/* ── Model Selector ───────────────────────────────── */

.chat-model-select {
  height: 26px;
  padding: 0 var(--space-2);
  padding-right: var(--space-5);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 10px;
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
  max-width: 140px;
}

.chat-model-select:focus {
  outline: none;
  border-color: var(--color-accent);
}

.chat-model-select option {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
}

.model-warning {
  color: var(--color-warning);
  font-size: 10px;
  font-weight: var(--font-medium);
}

/* ── @-Mention Dropdown ───────────────────────────── */

/* The input area needs to be a positioning context */
.chat-input-area {
  position: relative;
}

.mention-dropdown {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  max-height: 320px;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.35), 0 -2px 8px rgba(0, 0, 0, 0.2);
  z-index: var(--z-dropdown);
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.mention-dropdown::-webkit-scrollbar {
  width: 4px;
}

.mention-dropdown::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 2px;
}

/* Header: shows current browsing path / search context */
.mention-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border-subtle);
  position: sticky;
  top: 0;
  z-index: 1;
}

.mention-header-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: var(--font-semi);
  color: var(--color-text-tertiary);
  text-transform: none;
}

.mention-header-hint {
  font-size: 10px;
  color: var(--color-text-muted);
}

/* Each autocomplete item */
.mention-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px var(--space-3);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  font-size: var(--text-xs);
  border-left: 2px solid transparent;
}

.mention-item:hover {
  background: var(--color-bg-hover);
}

.mention-item.selected {
  background: var(--color-accent-subtle);
  border-left-color: var(--color-accent);
}

/* SVG icon in each item */
.mention-item-icon {
  flex-shrink: 0;
  color: var(--color-text-muted);
  opacity: 0.7;
}

.mention-item.selected .mention-item-icon {
  color: var(--color-accent-text);
  opacity: 1;
}

/* File / folder name */
.mention-item-name {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Parent path (dimmed, right-aligned) */
.mention-item-path {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
  flex-shrink: 0;
  text-align: right;
}

/* ── Mention Chip (in messages) ───────────────────── */

.mention-chip {
  display: inline;
  padding: 1px 6px;
  background: var(--color-accent-subtle);
  color: var(--color-accent-text);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85em;
  font-weight: var(--font-medium);
}

/* Empty / loading states */
.mention-empty {
  padding: var(--space-4) var(--space-3);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-style: italic;
}

/* ── Plan Card ────────────────────────────────────── */

.plan-card {
  margin: var(--space-3) var(--space-3);
  padding: var(--space-3);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  border-left: 3px solid var(--color-accent);
}

.plan-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.plan-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  color: var(--color-accent-text);
}

.plan-icon svg {
  width: 16px;
  height: 16px;
}

.plan-title {
  font-weight: var(--font-semi);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  flex: 1;
}

.plan-status.badge {
  font-size: 10px;
  padding: 2px 6px;
}

.plan-steps {
  list-style: none;
  padding: 0;
  margin: var(--space-2) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.plan-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  padding: var(--space-1) 0;
}

.step-checkbox {
  flex-shrink: 0;
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
}

.step-checkbox svg {
  width: 14px;
  height: 14px;
}

.step-description {
  line-height: var(--leading-normal);
}

.plan-step.completed .step-checkbox {
  color: var(--color-success);
}

.plan-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border-subtle);
}

.btn-success {
  background: var(--color-success);
  color: white;
  border: none;
}

.btn-success:hover {
  filter: brightness(1.1);
}

/* ── Diff Notification ────────────────────────────── */

.diff-notification {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-1) var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-info);
  font-size: var(--text-xs);
  transition: opacity var(--transition-base);
}

.diff-notification.diff-accepted {
  border-left-color: var(--color-success);
  opacity: 0.6;
}

.diff-notification.diff-rejected {
  border-left-color: var(--color-error);
  opacity: 0.4;
  text-decoration: line-through;
}

.diff-icon {
  flex-shrink: 0;
}

.diff-path {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-secondary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.diff-actions {
  display: flex;
  gap: var(--space-1);
  flex-shrink: 0;
}

.btn-xs {
  padding: 2px 6px;
  font-size: 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid var(--color-border-subtle);
  background: var(--color-bg-primary);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  line-height: 1;
}

.btn-xs:hover {
  border-color: var(--color-border);
  background: var(--color-bg-hover);
}

.btn-xs.btn-success {
  border-color: var(--color-success);
  color: var(--color-success);
  background: var(--color-success-bg);
}

.btn-xs.btn-success:hover {
  background: var(--color-success);
  color: white;
}

/* ── Markdown View Mode Toggle (3-segment) ───────── */

.md-view-toggle {
  display: inline-flex;
  gap: 1px;
  background: var(--color-bg-primary);
  border-radius: var(--radius-md);
  padding: 2px;
  border: 1px solid var(--color-border-subtle);
}

.md-view-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 22px;
  padding: 0;
  background: none;
  border: none;
  border-radius: calc(var(--radius-md) - 2px);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.md-view-toggle-btn:hover {
  color: var(--color-text-secondary);
  background: var(--color-bg-hover);
}

.md-view-toggle-btn.active {
  color: var(--color-accent-text);
  background: var(--color-accent-subtle);
}

.md-view-toggle-btn svg {
  flex-shrink: 0;
}

/* ── CodeMirror 6 Editor Container ────────────────── */

.editor-cm-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.cm-editor-wrapper {
  flex: 1;
  overflow: hidden;
}

.cm-editor-wrapper .cm-editor {
  height: 100%;
}

.cm-editor-wrapper .cm-scroller {
  overflow: auto;
}

/* Markdown preview (split pane) */
.editor-cm-container .editor-md-preview {
  overflow-y: auto;
  padding: var(--space-4);
  min-width: 120px;
}

/* Editor ↔ Preview Splitter */
.editor-preview-splitter {
  width: 4px;
  cursor: col-resize;
  background: var(--color-border-subtle);
  flex-shrink: 0;
  position: relative;
  z-index: 5;
  transition: background var(--transition-fast);
}

.editor-preview-splitter:hover,
.editor-preview-splitter.dragging {
  background: var(--color-accent);
}

/* Invisible wider hit area */
.editor-preview-splitter::after {
  content: '';
  position: absolute;
  inset: 0 -4px;
}

/* ── Diff Container ───────────────────────────────── */

#diff-container {
  min-height: 0;
}

#diff-container .cm-mergeView {
  height: 100%;
}

#diff-container .cm-mergeViewEditor {
  height: 100%;
}

#diff-container .cm-editor {
  height: 100%;
}

#diff-container .cm-scroller {
  overflow: auto;
}