/* Adaptive Learning OS — Notebook UI */

/* Level 1: Content Dev (default) */
body.level-content-dev,
body:not([class*="level-"]) {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-elevated: #212d3d;
  --border: #2d3a4d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --success: #3fb950;
  --error: #f85149;
  --radius: 10px;
  --radius-sm: 6px;
  --sidebar-width: 280px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

/* Level 2: Adaptive Learning */
body.level-adaptive-learning {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-elevated: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #7ee787;
  --accent-hover: #9ee99e;
  --success: #3fb950;
  --error: #f85149;
  --radius: 10px;
  --radius-sm: 6px;
  --sidebar-width: 280px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

/* Level 3: Virtual Instructor — AI Video Player (mock) */
.learn-video-player {
  margin: 1rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.learn-video-screen {
  aspect-ratio: 16 / 9;
  background: linear-gradient(145deg, #0a0e12 0%, #141a23 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  position: relative;
}

.learn-video-screen::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 40% at 50% 50%, rgba(126, 231, 135, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.learn-video-visual {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  text-align: center;
  max-width: 90%;
  z-index: 1;
}

.learn-video-transcript {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--text);
  max-height: 10rem;
  overflow-y: auto;
}

.learn-video-transcript::-webkit-scrollbar {
  width: 6px;
}

.learn-video-transcript::-webkit-scrollbar-track {
  background: var(--bg);
}

.learn-video-transcript::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.learn-video-actions {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  background: var(--surface-elevated);
}

.learn-step-teach-video .learn-key-points {
  margin: 1rem 1.25rem 0;
  padding-left: 1.25rem;
}

* {
  box-sizing: border-box;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 1rem;
}

.app-back {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
}

.app-back:hover {
  color: var(--accent);
}

.app-mode-badge {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.5rem;
  background: var(--surface-elevated);
  border-radius: 4px;
}

.app-level-nav {
  display: flex;
  gap: 0.25rem;
}

.app-level-btn {
  padding: 0.35rem 0.75rem;
  font-size: 0.8125rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.app-level-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.app-level-btn.active {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.app-project-name {
  flex: 1;
  min-width: 140px;
  max-width: 280px;
  padding: 0.35rem 0.65rem;
  font-size: 0.875rem;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
}

.app-project-name::placeholder {
  color: var(--text-muted);
}

.app-project-name:focus {
  outline: none;
  border-color: var(--accent);
}

body {
  margin: 0;
  font-family: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.noscript-error {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: var(--bg);
  color: var(--error);
  text-align: center;
  font-size: 1.125rem;
  z-index: 9999;
}

/* Notebook layout: sidebar + center */
.notebook {
  display: flex;
  min-height: 100vh;
  overflow: hidden;
}

/* —— Left: Sources (Labs) —— */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: relative;
  z-index: 110; /* Above version-history dropdown (z-index: 100) so Add Source stays clickable when they overlap */
}

.sidebar-header {
  padding: 1rem 1rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}
.sidebar-header-row .btn-clear,
.sidebar-header-row .btn-fold {
  flex-shrink: 0;
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
}

.btn-fold {
  font-size: 1rem;
  line-height: 1;
  padding: 0.25rem 0.4rem;
  min-width: 1.75rem;
}

.sidebar-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

/* Collapsed panels — fold to narrow strip, contained so no bleed into main area */
.sidebar.panel-collapsed {
  width: 36px;
  min-width: 36px;
  flex-shrink: 0;
  overflow: hidden;
}

.sidebar.panel-collapsed .sidebar-body {
  display: none;
}

.sidebar.panel-collapsed .sidebar-header-row .sidebar-title,
.sidebar.panel-collapsed .sidebar-header-row .sidebar-subtitle,
.sidebar.panel-collapsed .btn-clear {
  display: none;
}

.sidebar.panel-collapsed .btn-fold {
  margin: 0 auto;
}

.sidebar.panel-collapsed .sidebar-header-row {
  justify-content: center;
}

.opportunities-panel-middle.panel-collapsed {
  width: 36px;
  min-width: 36px;
  max-width: 36px;
  flex-shrink: 0;
  overflow: hidden;
}

.opportunities-panel-middle.panel-collapsed .opportunities-panel-inner {
  display: none;
}

.opportunities-panel-middle.panel-collapsed .opportunities-panel-header {
  flex-direction: column;
  padding: 0.5rem;
  justify-content: center;
}

.opportunities-panel-middle.panel-collapsed .opportunities-panel-title {
  display: none;
}

.opportunities-panel-middle.panel-collapsed .btn-fold {
  margin: 0 auto;
}


.sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.15rem;
  letter-spacing: -0.01em;
}

.sidebar-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0;
}

.workflow-choice {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
}

.lab-to-update-section,
.update-sources-section {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
}

.lab-to-update-actions {
  display: flex;
  gap: 0.5rem;
  margin: 0.35rem 0;
}

.lab-to-update-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.drop-zone-small {
  padding: 0.4rem 0.5rem;
  min-height: auto;
}

.sources-list-compact .source-item {
  padding: 0.35rem 0;
}

/* Opportunities panel — middle panel (Panel 2), only visible after Extract */
.opportunities-panel-middle,
.opportunities-panel-side {
  width: 320px;
  min-width: 280px;
  max-width: 400px;
  flex-shrink: 0;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.opportunities-panel-middle {
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

.opportunities-panel-side {
  border-left: 1px solid var(--border);
}

.opportunities-panel-middle[hidden],
.opportunities-panel-side[hidden] {
  display: none !important;
}

.opportunities-panel-inner {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.25rem;
  overflow-y: auto;
  height: 100%;
}

.opportunities-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.25rem 0.5rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.opportunities-panel-title {
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 0;
}

.opportunities-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.opportunities-list {
  flex: 1;
  min-height: 120px;
  max-height: 240px;
  overflow-y: auto;
  margin-bottom: 0.75rem;
  padding: 0.25rem 0;
}

.opportunities-update-sections {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.opportunities-subsection {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  background: var(--bg);
}

.opportunities-subsection-title {
  font-size: 0.8125rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.opportunities-subsection-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem;
}

.opportunities-subsection .opportunities-list {
  min-height: 80px;
  max-height: 140px;
}

.opportunity-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.35rem 0;
  font-size: 0.875rem;
}

.opportunity-item input[type="checkbox"] {
  margin-top: 0.2rem;
  flex-shrink: 0;
}

.opportunity-item label {
  cursor: pointer;
  flex: 1;
  word-break: break-word;
}

.opportunity-type-badge {
  flex-shrink: 0;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-weight: 600;
}

.opportunity-type-walkthrough {
  background: var(--border);
  color: var(--text-muted);
}

.opportunity-type-sql {
  background: rgba(88, 166, 255, 0.2);
  color: var(--accent);
}

.opportunity-type-python {
  background: rgba(126, 231, 135, 0.2);
  color: var(--accent);
}

.llm-picker-section {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
}
.llm-picker-section summary {
  font-size: 0.8125rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}
.llm-picker-inner {
  margin-top: 0.6rem;
}
.llm-picker-row {
  margin-bottom: 0.5rem;
}
.llm-picker-row:last-child {
  margin-bottom: 0;
}

.platform-choice {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  overflow: visible;
}

.code-choice,
.export-choice {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
}

.code-choice-label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.code-select {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.875rem;
  cursor: pointer;
}

.code-select option {
  background: #1a2332 !important;
  color: #e6edf3 !important;
}

.platform-select {
  background-color: var(--surface-elevated);
  color: var(--text);
  color-scheme: dark;
  appearance: menulist;
  -webkit-appearance: menulist;
}

.platform-select option {
  background-color: var(--surface) !important;
  color: var(--text) !important;
}

.code-select {
  color-scheme: dark;
}

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

.add-source {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  padding: 0.6rem 0.75rem;
  transition: border-color 0.2s, background 0.2s;
  cursor: pointer;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.06);
}

.drop-icon-small {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.drop-zone:hover .drop-icon-small,
.drop-zone.drag-over .drop-icon-small {
  color: var(--accent);
}

.drop-zone-label {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
  cursor: pointer;
  flex: 1;
}

.drop-text-small {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.8125rem;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}

.btn-link:hover {
  color: var(--accent-hover);
}

.challenge-link {
  color: var(--accent);
  text-decoration: none;
}
.challenge-link:hover { text-decoration: underline; }

.custom-prompt-wrap {
  margin-top: 0.75rem;
}

.lab-prompts-section {
  margin-top: 0.5rem;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
}
.lab-prompts-section summary {
  cursor: pointer;
  color: var(--text-muted);
  list-style: none;
  user-select: none;
}
.lab-prompts-section summary::-webkit-details-marker { display: none; }
.lab-prompts-section summary::before { content: "▸ "; }
.lab-prompts-section[open] summary::before { content: "▾ "; }

.builtin-prompts {
  margin: 0.5rem 0;
  padding-left: 0;
  color: var(--text-muted);
  line-height: 1.4;
}
.builtin-prompts-summary .builtin-summary {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}
.builtin-prompts ul {
  margin: 0;
  padding-left: 1rem;
}
.builtin-prompts li {
  margin: 0.25rem 0;
}
.builtin-prompts .builtin-empty {
  margin: 0;
  font-style: italic;
  color: var(--text-muted);
}

.custom-prompt-label {
  display: block;
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}
.custom-prompt-input {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.4rem 0.5rem;
  font-size: 0.8125rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  resize: vertical;
  min-height: 2.5rem;
}
.custom-prompt-input:focus {
  outline: none;
  border-color: var(--accent);
}

.link-row {
  display: flex;
  gap: 0.5rem;
  position: relative;
  z-index: 2; /* Above drop-zone so Add button stays clickable */
}

.link-input {
  flex: 1;
  min-width: 0;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.8125rem;
}

.link-input::placeholder {
  color: var(--text-muted);
}

.link-input:focus {
  outline: none;
  border-color: var(--accent);
}

.btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background 0.2s, color 0.2s;
}

.btn-small {
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background: var(--surface-elevated);
  color: var(--text);
}

.sources-list-wrap {
  flex-shrink: 0;
  min-height: 0;
}

.sources-list {
  min-height: 48px;
  padding: 0.5rem 1rem;
}

.source-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  margin: 0 0.5rem 0.25rem;
  border-radius: var(--radius-sm);
  background: var(--surface-elevated);
  border: 1px solid transparent;
  font-size: 0.8125rem;
}

.source-item:hover {
  border-color: var(--border);
}

.source-item .source-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-item .source-type {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.source-item .btn-remove {
  flex-shrink: 0;
  padding: 0.2rem;
  font-size: 1rem;
  line-height: 1;
  opacity: 0.7;
}

.source-item .btn-remove:hover {
  opacity: 1;
  color: var(--error);
}

.sidebar-status {
  padding: 0.6rem 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
}

.sidebar-status .progress-bar {
  height: 8px;
  min-height: 8px;
  margin-top: 0.5rem;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.sidebar-status .progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s ease;
}

.sidebar-status .progress-fill.progress-fill--building {
  background: #22c55e;
}

/* Alert container — top of central preview; holds warning/error banners */
.alert-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.alert-container[hidden] {
  display: none;
}

/* Parse issues (e.g. PDF page skipped) — yellow/orange */
.alert-warning,
.warning-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: var(--radius-sm);
  color: #b45309;
}

.warning-banner[hidden] {
  display: none;
}

.warning-banner-content {
  flex: 1;
  line-height: 1.4;
}

.warning-banner-content ul {
  margin: 0.35rem 0 0 1rem;
  padding: 0;
}

.warning-banner-dismiss {
  flex-shrink: 0;
  padding: 0 0.25rem;
  font-size: 1.25rem;
  line-height: 1;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

.warning-banner-dismiss:hover {
  color: var(--text);
}

/* Chunk/generation failures — red */
.alert-error,
.error-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  background: rgba(248, 81, 73, 0.12);
  border: 1px solid rgba(248, 81, 73, 0.35);
  border-radius: var(--radius-sm);
  color: var(--error);
}

.error-banner[hidden] {
  display: none;
}

.error-banner-content {
  flex: 1;
  line-height: 1.4;
}

.error-banner-content ul {
  margin: 0.35rem 0 0 1rem;
  padding: 0;
}

.error-banner-dismiss {
  flex-shrink: 0;
  padding: 0 0.25rem;
  font-size: 1.25rem;
  line-height: 1;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

.error-banner-dismiss:hover {
  color: var(--text);
}

/* In-progress status — clearer phase indication */
.sidebar-status.in-progress .progress-bar {
  opacity: 1;
}

/* Export success toast — visible in main area */
.export-toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.75rem 1.25rem;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 0.875rem;
  color: var(--text);
  z-index: 500;
  max-width: 90vw;
}

.export-toast[hidden] {
  display: none;
}

/* Build lab progress bar — visible in main area */
.build-progress {
  padding: 0.75rem 0;
  margin-bottom: 1rem;
  border-radius: var(--radius);
  background: var(--surface-elevated);
  border: 1px solid var(--border);
}

.build-progress[hidden] {
  display: none;
}

.build-progress-text {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.build-progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.build-progress-fill {
  height: 100%;
  background: var(--success);
  border-radius: 3px;
  width: 0%;
  transition: width 0.3s ease;
}

/* —— Center: AI prompt —— */
.center {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  overflow-x: hidden;
}

.center-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  margin: 0;
  padding: 1.5rem 2rem 1rem;
  min-width: 0;
}

/* Extra spacing when Sources panel is collapsed — lab content no longer butts against strip */
.sidebar.panel-collapsed + .center .center-inner {
  padding-left: 2.5rem;
}

/* Gap between collapsed Opportunities strip and lab content */
.main-panels .opportunities-panel-middle.panel-collapsed + .preview-container {
  margin-left: 0.5rem;
}

.main-panels-wrap {
  max-width: none;
}

.main-panels {
  flex: 1;
  display: flex;
  gap: 0;
  min-height: 0;
  overflow: hidden;
}

/* Panel 3: Build and edit labs — rightmost, flexible */
.preview-panel-build {
  flex: 1;
  min-width: 320px;
}

.preview-panel {
  flex: 1;
  min-width: 0;
}

.center-header {
  margin-bottom: 1.5rem;
}

.center-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.version-history-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.version-history-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.25rem;
  min-width: 260px;
  max-width: 360px;
  max-height: 280px;
  overflow-y: auto;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  z-index: 100;
}

.version-history-dropdown[hidden] {
  display: none;
}

.version-history-items {
  display: flex;
  flex-direction: column;
  padding: 0.25rem 0;
}

.version-history-item {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  text-align: left;
  font-size: 0.8125rem;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}

.version-history-item:hover {
  background: var(--surface);
}

.version-history-item .version-msg {
  display: block;
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: 0.15rem;
}

.version-history-empty {
  padding: 0.75rem 1rem;
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Analytics modal (Epic 2) */
.analytics-content {
  margin: 1rem 0;
}
.analytics-loading {
  color: var(--text-muted);
  font-size: 0.9375rem;
}
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.analytics-stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  text-align: center;
}
.analytics-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
}
.analytics-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}
.analytics-dropoff {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.analytics-dropoff caption {
  text-align: left;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}
.analytics-dropoff th,
.analytics-dropoff td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}
.analytics-empty,
.analytics-error {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0.5rem 0;
}
.analytics-error {
  color: var(--error);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1rem 0;
}
.login-form input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.9375rem;
  box-sizing: border-box;
}
.login-form input:focus {
  outline: none;
  border-color: var(--accent);
}

.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.auth-tab {
  flex: 1;
  padding: 0.625rem 1rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.15s, border-color 0.15s;
}
.auth-tab:hover { color: var(--text); }
.auth-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.build-lab-btn {
  width: 100%;
  margin-top: 0.5rem;
}

.center-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
  letter-spacing: -0.02em;
}

.center-subtitle {
  color: var(--text-muted);
  font-size: 0.9375rem;
  margin: 0;
}

.prompt-conversation {
  flex: 1;
  min-height: 200px;
}

.prompt-placeholder {
  color: var(--text-muted);
  font-size: 0.9375rem;
  padding: 1rem 0;
}

.prompt-placeholder-hint {
  font-size: 0.8125rem;
  margin-top: 0.5rem;
  opacity: 0.85;
}

.prompt-messages {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.prompt-message {
  padding: 1rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  line-height: 1.55;
}

.prompt-message.user {
  background: var(--surface);
  border: 1px solid var(--border);
  margin-left: 0;
  margin-right: 2rem;
}

.prompt-message.assistant {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  margin-left: 2rem;
  margin-right: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.prompt-message .message-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.prompt-input-wrap {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.prompt-input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9375rem;
  font-family: inherit;
  line-height: 1.5;
  resize: vertical;
  min-height: 80px;
  max-height: 240px;
}

.prompt-input::placeholder {
  color: var(--text-muted);
}

.prompt-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

.prompt-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.prompt-status {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.prompt-status.error {
  color: var(--error);
}

/* —— Lab preview (center) —— */
.preview-container {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.preview-empty-state {
  color: var(--text-muted);
  font-size: 0.9375rem;
  padding: 2rem 0;
}

.preview-empty-state p {
  margin: 0 0 0.5rem;
}

.preview-empty-hint {
  font-size: 0.8125rem;
  opacity: 0.85;
}

.preview-content {
  padding-bottom: 2rem;
}

.preview-header {
  margin-bottom: 1.5rem;
}

.preview-header .preview-title-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.preview-header .preview-title-row .preview-title-input {
  flex: 1;
  min-width: 120px;
  margin-bottom: 0;
}

.quality-badge {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.quality-badge--verified {
  background: rgba(63, 185, 80, 0.2);
  color: var(--success);
  border: 1px solid rgba(63, 185, 80, 0.4);
}

.quality-badge--warning {
  background: rgba(210, 153, 34, 0.2);
  color: #d29922;
  border: 1px solid rgba(210, 153, 34, 0.4);
}

.quality-details-panel {
  margin: 0.5rem 0 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 0.8125rem;
}
.quality-details-toggle {
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  color: #d29922;
  font-weight: 600;
  list-style: none;
}
.quality-details-toggle::marker,
.quality-details-toggle::-webkit-details-marker { display: none; }
.quality-details-toggle::before { content: "▸ "; }
.quality-details-panel[open] .quality-details-toggle::before { content: "▾ "; }
.quality-details-body {
  padding: 0.5rem 0.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.quality-check {
  line-height: 1.5;
}
.quality-check--pass { color: var(--success); }
.quality-check--fail { color: #d29922; }

/* --- Update Diff View --- */

.diff-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  position: sticky;
  top: 0;
  z-index: 10;
}
.diff-toolbar-title {
  font-weight: 700;
  font-size: 1rem;
  display: block;
}
.diff-toolbar-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.diff-toolbar-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}
.diff-btn {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: background 0.15s;
}
.diff-btn--accept {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}
.diff-btn--accept:hover { filter: brightness(1.15); }
.diff-btn--reject {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}
.diff-btn--reject:hover { background: rgba(255,255,255,0.05); }

.diff-summary {
  display: flex;
  gap: 1rem;
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}
.diff-stat--added { color: var(--success); }
.diff-stat--modified { color: #d29922; }

.diff-header {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}
.diff-title { font-size: 1.3rem; margin: 0; }
.diff-old-value {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: line-through;
  margin: 0.25rem 0 0;
  opacity: 0.7;
}

.diff-section, .diff-block {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}
.diff-section h3 { margin: 0 0 0.25rem; font-size: 0.9rem; }
.diff-list { margin: 0; padding-left: 1.25rem; }
.diff-list li { margin: 0.15rem 0; }
.diff-text { margin: 0.25rem 0; }

.diff-exercise {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  margin-bottom: 0.75rem;
}
.diff-exercise-header {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
}
.diff-exercise-label {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.diff-exercise-title { font-weight: 600; }

.diff-task {
  border-left: 3px solid var(--border);
  padding: 0.5rem 0 0.5rem 0.75rem;
  margin: 0.5rem 0;
}
.diff-task-header {
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.35rem;
}
.diff-task-label {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  margin-right: 0.35rem;
}

.diff-step {
  padding: 0.4rem 0.5rem;
  border-radius: var(--radius-sm);
  margin: 0.35rem 0;
}
.diff-step-header {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.diff-code-block { margin: 0.35rem 0; }
.diff-code {
  background: var(--bg);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  overflow-x: auto;
  white-space: pre-wrap;
  margin: 0.25rem 0;
}
.diff-code--old { opacity: 0.5; text-decoration: line-through; }
.diff-old-code summary {
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
}

/* Diff highlight colors */
.diff-added {
  background: rgba(63, 185, 80, 0.08);
  border-left: 3px solid var(--success);
}
.diff-modified {
  background: rgba(210, 153, 34, 0.08);
  border-left: 3px solid #d29922;
}
.diff-removed {
  background: rgba(248, 81, 73, 0.08);
  border-left: 3px solid #f85149;
  opacity: 0.6;
}
.diff-task.diff-added { border-left-color: var(--success); }
.diff-task.diff-modified { border-left-color: #d29922; }

.diff-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  vertical-align: middle;
  margin-left: 0.35rem;
}
.diff-badge--added { background: rgba(63,185,80,0.2); color: var(--success); }
.diff-badge--modified { background: rgba(210,153,34,0.2); color: #d29922; }
.diff-badge--removed { background: rgba(248,81,73,0.2); color: #f85149; }

.preview-title-input {
  width: 100%;
  padding: 0.5rem 0;
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
  font-weight: 600;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.preview-title-input:focus {
  outline: none;
  border-color: var(--accent);
}

.preview-desc-input {
  width: 100%;
  padding: 0.5rem 0;
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  resize: vertical;
  font-family: inherit;
}

.preview-desc-input:focus {
  outline: none;
  border-color: var(--accent);
}

.preview-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
}

.preview-section {
  margin-bottom: 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.preview-section-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
}

.preview-section label,
.preview-task label,
.preview-checkpoint label,
.preview-level-up label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.preview-input,
.preview-inline-input {
  width: 100%;
  padding: 0.5rem 0.65rem;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
}

.preview-input:focus,
.preview-inline-input:focus {
  outline: none;
  border-color: var(--accent);
}

.preview-inline-input {
  display: inline-block;
  width: auto;
  min-width: 200px;
}

.preview-title-row {
  margin-bottom: 0.75rem;
}

.preview-title-row .preview-title-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.preview-title-row .preview-title-input-full {
  width: 100%;
  font-size: 1rem;
  font-weight: 600;
}

.preview-title-row-task .preview-title-label {
  font-size: 0.875rem;
}

.preview-textarea {
  width: 100%;
  padding: 0.5rem 0.65rem;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  resize: vertical;
  font-family: inherit;
}

.preview-code-block {
  margin: 0.75rem 0;
  padding: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* Visual Scaffolding Editor — tier highlights */
.scaffolding-toolbar {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.scaffolding-toolbar .toolbar-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-right: 0.25rem;
}

.scaffolding-toolbar .scaffold-btn {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.scaffolding-toolbar .scaffold-btn:hover {
  background: var(--surface-elevated);
  border-color: var(--text-muted);
}

.scaffolding-toolbar .scaffold-btn.scaffold-beginner {
  border-color: var(--border);
}

.scaffolding-toolbar .scaffold-btn.scaffold-intermediate {
  border-color: rgba(212, 175, 55, 0.6);
  background: rgba(212, 175, 55, 0.1);
}

.scaffolding-toolbar .scaffold-btn.scaffold-advanced {
  border-color: rgba(220, 100, 60, 0.6);
  background: rgba(220, 100, 60, 0.1);
}

.scaffolding-code-view {
  font-family: "SF Mono", "Monaco", "Consolas", "Menlo", monospace;
  font-size: 0.8125rem;
  line-height: 1.5;
  padding: 0.5rem 0.65rem;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-all;
  user-select: text;
  cursor: text;
  tab-size: 4;
  min-height: 6rem;
}

.scaffolding-code-view .highlight-intermediate {
  background: rgba(255, 215, 0, 0.4);
  border-radius: 2px;
  padding: 0 2px;
}

.scaffolding-code-view .highlight-advanced {
  background: rgba(255, 140, 0, 0.4);
  border-radius: 2px;
  padding: 0 2px;
}

.preview-code-label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.preview-expected-block {
  margin-top: 0.5rem;
}

.preview-learner-callout {
  margin-top: 0.6rem;
  padding: 0.6rem 0.75rem;
  background: var(--surface-elevated);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
}

.preview-learner-label {
  color: var(--text-muted);
  font-weight: 500;
}

.preview-learner-removed {
  color: var(--accent);
  font-weight: 600;
}

.preview-learner-code {
  margin: 0.5rem 0 0;
  padding: 0.5rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-family: "SF Mono", "Monaco", "Consolas", "Menlo", monospace;
  font-size: 0.75rem;
  overflow-x: auto;
  white-space: pre-wrap;
}

.learner-preview-toggle {
  margin-right: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.preview-code {
  width: 100%;
  padding: 0.5rem 0.65rem;
  margin: 0;
  font-size: 0.8125rem;
  font-family: "SF Mono", "Monaco", "Consolas", "Menlo", monospace;
  line-height: 1.5;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  resize: vertical;
  tab-size: 4;
}

.preview-list {
  list-style: none;
  padding: 0;
  margin: 0 0 0.5rem;
}

.preview-list li {
  margin-bottom: 0.35rem;
}

.preview-list-item {
  width: 100%;
  padding: 0.4rem 0.65rem;
  font-size: 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
}

.preview-list-item-textarea {
  min-height: 2.25rem;
  resize: none;
  overflow-y: hidden;
  font-family: inherit;
  line-height: 1.4;
}

.preview-instruction-textarea {
  min-height: 2.5rem;
  resize: none;
  overflow-y: hidden;
  font-family: inherit;
  line-height: 1.4;
}

.preview-desc-input,
.preview-textarea,
.preview-code {
  min-height: 2.5rem;
  resize: none;
}

.preview-task {
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.preview-task h4 {
  margin: 0 0 0.5rem;
  font-size: 0.9375rem;
}

.preview-step {
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--border);
}

.preview-checkpoint,
.preview-level-up {
  margin-bottom: 0.75rem;
}

.source-item.selected {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.08);
}

.source-item .btn-lab {
  flex-shrink: 0;
}

/* Export format modal */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal[hidden] {
  display: none;
}
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
}
.modal-content {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  max-width: 360px;
  width: calc(100% - 2rem);
  box-shadow: var(--shadow);
}
.modal-title {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.modal-description {
  margin: 0 0 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}
.export-watermark-wrap {
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.875rem;
}
.checkbox-row input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
  cursor: pointer;
}
.watermark-input-wrap {
  margin-top: 0.5rem;
  margin-left: 1.5rem;
}
.watermark-input {
  width: 100%;
  padding: 0.4rem 0.5rem;
  font-size: 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
}
.watermark-input::placeholder {
  color: var(--text-muted);
}
.watermark-hint {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}
.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.modal-actions .btn {
  width: 100%;
}

.export-formats {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.export-format-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  width: 100%;
  padding: 0.65rem 1rem;
  font-size: 0.9375rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.export-format-btn:hover {
  border-color: var(--accent);
  background: var(--surface-elevated);
}
.export-format-name {
  font-weight: 600;
  margin-bottom: 0.2rem;
}
.export-format-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.3;
}

.modal-cancel {
  margin-top: 1rem;
  width: 100%;
}

/* ── Project name with label ── */
.app-project-name-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  min-width: 140px;
  max-width: 320px;
}

.app-project-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.app-project-name-wrap .app-project-name {
  flex: 1;
  max-width: none;
}

/* ── Help panel (expandable, top of sidebar) ── */
.help-panel {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.help-panel-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.help-panel-toggle::-webkit-details-marker { display: none; }

.help-panel-toggle::before {
  content: "▸ ";
  font-size: 0.7rem;
  transition: transform 0.15s;
}

.help-panel[open] .help-panel-toggle::before {
  content: "▾ ";
}

.help-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  flex-shrink: 0;
}

.help-panel-body {
  padding: 0 1rem 0.75rem;
}

.help-steps-list {
  margin: 0;
  padding: 0 0 0 1.25rem;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--text);
}

.help-steps-list li {
  margin-bottom: 0.35rem;
}

.help-steps-list li strong {
  color: var(--accent);
}

.help-note {
  margin: 0.5rem 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Step badges (numbered circles on sidebar labels) ── */
.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  margin-right: 0.35rem;
  flex-shrink: 0;
  vertical-align: middle;
}

/* ── Info icon (tooltip trigger) ── */
.info-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  font-size: 0.6rem;
  font-weight: 700;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: help;
  padding: 0;
  margin-left: 0.35rem;
  position: relative;
  vertical-align: middle;
  transition: border-color 0.15s, color 0.15s;
}

.info-icon:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Tooltip popover ── */
.tooltip-popover {
  position: fixed;
  z-index: 200;
  width: 220px;
  padding: 0.6rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text);
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.15s, transform 0.15s;
}

.tooltip-popover.tooltip-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ── Empty state (preview area) ── */
.preview-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 2rem;
  min-height: 400px;
}

.empty-state-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  opacity: 0.3;
}

.empty-state-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.empty-state-subtitle {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin: 0 0 2rem;
  max-width: 400px;
}

.empty-state-steps {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  max-width: 380px;
  text-align: left;
  margin-bottom: 2rem;
}

.empty-step {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.empty-step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.empty-step div {
  display: flex;
  flex-direction: column;
}

.empty-step strong {
  font-size: 0.9375rem;
  color: var(--text);
  margin-bottom: 0.1rem;
}

.empty-step-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.4;
}

[hidden] {
  display: none !important;
}