/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V4
 * Hallmark · genre: modern-minimal · tone: calm local-first · anchor: green · macrostructure: Workbench · designed-as-app
 * Hallmark · workbench knobs: hierarchy=ordered-tree (was split-list) · editor=ordered-parts
 * Hallmark · contrast: pass (40–41) · nav: N2 · footer: none · slop: pass (42–45) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · responsive: pass (49) · icons: pass (30) · mobile: pass (34, 49, 50–57)
 */
@import url("tokens.css");

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
  overflow-x: clip;
}

body {
  background: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
input,
textarea,
select {
  color: inherit;
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

svg {
  display: block;
  flex: 0 0 auto;
}

h1,
h2,
h3 {
  min-width: 0;
  overflow-wrap: anywhere;
}

::selection {
  background: var(--color-surface-subtle);
  color: var(--color-text);
}

:where(a, button, input, textarea, select, [tabindex]):focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.num {
  font-variant-numeric: tabular-nums;
}

.mono {
  font-family: var(--font-mono);
}

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

.workspace {
  min-height: 100svh;
  background: var(--color-canvas);
}

.sidebar {
  display: grid;
  grid-template-areas:
    "project utilities"
    "navigation navigation";
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-2) var(--space-1);
  padding: max(var(--space-2), env(safe-area-inset-top)) var(--space-3)
    var(--space-2);
  border-bottom: var(--rule) solid var(--color-border);
  background: var(--color-canvas);
}

.project-identity {
  grid-area: project;
  min-width: 0;
  padding-inline: var(--space-2);
}

.project-name {
  display: block;
  overflow: hidden;
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.project-location {
  display: none;
  overflow: hidden;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-utilities {
  grid-area: utilities;
  display: flex;
  gap: var(--space-1);
}

.side-nav {
  grid-area: navigation;
  display: flex;
  gap: var(--space-1);
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.side-nav::-webkit-scrollbar {
  display: none;
}

.nav-item,
.icon-button,
.button,
.tool-button,
.tab,
.command-row,
.list-row,
.reorder-handle,
.ordered-main {
  white-space: nowrap;
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--control-md);
  padding-inline: var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 600;
}

.nav-item[aria-current="page"] {
  background: var(--color-surface-subtle);
  color: var(--color-text);
}

.nav-item[aria-current="page"] svg {
  color: var(--color-brand);
}

.sidebar-status {
  display: none;
}

.icon-button {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: var(--control-md);
  height: var(--control-md);
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--control-md);
  padding-inline: var(--space-4);
  border: var(--rule) solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 700;
  transition:
    background-color var(--dur-short) var(--ease-out),
    transform var(--dur-micro) var(--ease-out);
}

.button:active,
.icon-button:active,
.nav-item:active,
.command-row:active,
.list-row:active,
.reorder-handle:active,
.ordered-main:active {
  transform: translateY(1px);
}

.button.primary {
  background: var(--color-brand);
  color: var(--color-brand-ink);
}

.button.secondary {
  border-color: var(--color-border-strong);
  background: var(--color-surface);
}

.button.ghost {
  color: var(--color-text-muted);
}

.button.danger {
  background: var(--color-error-subtle);
  color: var(--color-error);
}

:where(
  .button,
  .icon-button,
  .nav-item,
  .command-row,
  .list-row,
  .reorder-handle,
  .ordered-main
)[aria-disabled="true"],
:where(
  .button,
  .icon-button,
  .nav-item,
  .command-row,
  .list-row,
  .reorder-handle,
  .ordered-main,
  .tool-button,
  .tab,
  .preview-option,
  input,
  textarea,
  select
):disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.work-surface {
  min-width: 0;
  min-height: calc(100svh - 7rem);
  padding: var(--space-6);
  background: var(--color-surface);
}

.work-inner {
  width: min(100%, var(--content-max));
  margin-inline: auto;
}

.work-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.work-heading {
  min-width: 0;
  flex: 1 1 20rem;
}

.work-title {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.work-description {
  max-width: 65ch;
  margin: var(--space-2) 0 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.work-actions,
.toolbar,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.panel {
  border-block: var(--rule) solid var(--color-border);
}

.panel-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  min-height: 3.25rem;
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--rule) solid var(--color-border);
}

.panel-title {
  margin: 0;
  font-size: var(--text-sm);
  font-weight: 700;
}

.panel-description {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  white-space: nowrap;
}

.status::before {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--color-brand);
  content: "";
}

.status.warning::before {
  background: var(--color-warning);
}

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

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 1.5rem;
  padding-inline: var(--space-2);
  border: var(--rule) solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  white-space: nowrap;
}

.tag.accent {
  border-color: transparent;
  background: var(--color-surface-subtle);
  color: var(--color-brand);
}

.tag.warning {
  border-color: transparent;
  background: var(--color-warning-subtle);
  color: var(--color-warning);
}

:root[data-theme="dark"] .nav-item[aria-current="page"] svg,
:root[data-theme="dark"] .command-icon,
:root[data-theme="dark"] .asset-ref svg,
:root[data-theme="dark"] .media-kind {
  color: var(--color-text-muted);
}

:root[data-theme="dark"] .tag.accent {
  border-color: var(--color-brand);
  color: var(--color-text);
}

.field {
  display: grid;
  gap: var(--space-2);
}

.field-label {
  font-size: var(--text-sm);
  font-weight: 700;
}

.field-help {
  min-height: 1lh;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.input,
.textarea,
.select {
  width: 100%;
  border: var(--rule) solid var(--color-border-strong);
  border-radius: var(--radius-md);
  outline: 2px solid transparent;
  outline-offset: 1px;
  background: var(--color-surface);
  color: var(--color-text);
}

.input,
.select {
  min-height: var(--control-md);
  padding-inline: var(--space-3) calc(var(--space-6) + var(--space-2));
}

.textarea {
  min-height: 7rem;
  padding: var(--space-3);
  resize: vertical;
}

.input:focus-visible,
.textarea:focus-visible,
.select:focus-visible {
  border-color: var(--color-text-muted);
  outline-color: var(--color-focus-ring);
}

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

.form-grid {
  display: grid;
  gap: var(--space-5);
}

.callout {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border: var(--rule) solid var(--color-border);
  background: var(--color-canvas);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.callout strong {
  color: var(--color-text);
}

.empty-state {
  display: grid;
  justify-items: start;
  min-height: 16rem;
  align-content: center;
  gap: var(--space-3);
  border-block: var(--rule) solid var(--color-border);
}

.empty-state h2,
.empty-state p {
  margin: 0;
}

.empty-state h2 {
  font-size: var(--text-md);
}

.empty-state p {
  max-width: 48ch;
  color: var(--color-text-muted);
}

.hub {
  min-height: 100svh;
  padding: max(var(--space-4), env(safe-area-inset-top))
    max(var(--space-4), env(safe-area-inset-right))
    max(var(--space-8), env(safe-area-inset-bottom))
    max(var(--space-4), env(safe-area-inset-left));
  background: var(--color-surface);
}

.hub-tools {
  display: flex;
  justify-content: flex-end;
}

.hub-main {
  width: min(100%, 46rem);
  margin: clamp(3rem, 12vh, 8rem) auto 0;
}

.hub-title {
  margin: 0 0 var(--space-6);
  font-size: var(--text-lg);
  letter-spacing: -0.025em;
}

.command-list {
  border-block: var(--rule) solid var(--color-border);
}

.command-row {
  display: grid;
  grid-template-columns: var(--control-md) minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  min-height: 4rem;
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-bottom: var(--rule) solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  text-align: left;
  transition:
    background-color var(--dur-short) var(--ease-out),
    transform var(--dur-micro) var(--ease-out);
}

.command-row:last-child {
  border-bottom: 0;
}

.command-icon {
  display: grid;
  place-items: center;
  color: var(--color-brand);
}

.command-name {
  display: block;
  font-size: var(--text-base);
  font-weight: 700;
}

.command-detail {
  display: block;
  overflow: hidden;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hub-note {
  max-width: 58ch;
  margin: var(--space-4) 0 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.dialog-page {
  display: grid;
  min-height: 100svh;
  place-items: center;
  padding: var(--space-4);
  background: var(--color-canvas);
}

.dialog-card {
  width: min(100%, 32rem);
  border: var(--rule) solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.dialog-header,
.dialog-body,
.dialog-actions {
  padding: var(--space-5);
}

.dialog-header {
  border-bottom: var(--rule) solid var(--color-border);
}

.dialog-title {
  margin: 0;
  font-size: var(--text-md);
}

.dialog-description {
  margin: var(--space-2) 0 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  border-top: var(--rule) solid var(--color-border);
}

.list {
  border-block: var(--rule) solid var(--color-border);
}

.list-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-4);
  width: 100%;
  overflow: hidden;
  min-height: 3.5rem;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border: 0;
  border-bottom: var(--rule) solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  text-align: left;
}

.list-row:last-child {
  border-bottom: 0;
}

.list-row[aria-current="true"],
.list-row.selected {
  background: var(--color-surface-subtle);
}

.row-title,
.row-detail {
  display: block;
}

.row-title {
  overflow: hidden;
  font-size: var(--text-sm);
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.structure-surface {
  max-width: 72rem;
}

.unit-stack {
  display: grid;
  gap: var(--space-8);
}

.unit-block {
  min-width: 0;
  border-block: var(--rule) solid var(--color-border);
}

.unit-header {
  display: grid;
  grid-template-columns: var(--control-sm) 2rem minmax(0, 1fr);
  align-items: center;
  gap: var(--space-2);
  min-height: 4rem;
  padding: var(--space-2) var(--space-3);
  background: var(--color-canvas);
}

.unit-header > .button {
  grid-column: 3;
  justify-self: start;
}

.unit-name,
.part-name {
  display: block;
  overflow: hidden;
  font-size: var(--text-sm);
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-order,
.part-order {
  border-top: var(--rule) solid var(--color-border);
}

.ordered-row {
  display: grid;
  grid-template-columns: var(--control-sm) 2rem minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  min-height: 3.75rem;
  padding: var(--space-2) var(--space-3);
  border-bottom: var(--rule) solid var(--color-border);
}

.ordered-row:last-child {
  border-bottom: 0;
}

.ordered-row.selected {
  background: var(--color-surface-subtle);
}

.part-order .ordered-row {
  grid-template-columns: var(--control-sm) 2rem minmax(0, 1fr);
}

.ordered-main {
  display: block;
  min-width: 0;
  padding: 0;
  overflow: hidden;
  border: 0;
  background: transparent;
  color: var(--color-text);
  text-align: start;
}

.order-index {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
}

.reorder-handle {
  display: inline-grid;
  width: var(--control-sm);
  height: var(--control-sm);
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  cursor: grab;
}

.reorder-handle:active {
  cursor: grabbing;
}

[data-reorder-item].dragging {
  opacity: 0.55;
}

[data-reorder-item].drag-over {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: -2px;
}

.lesson-outline .panel-header {
  justify-content: space-between;
}

.part-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 3rem;
  margin-bottom: var(--space-2);
}

.row-detail {
  overflow: hidden;
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.content-layout {
  display: grid;
  border-block: var(--rule) solid var(--color-border);
}

.content-layout > * {
  min-width: 0;
}

.collection-list {
  align-self: start;
  border-bottom: var(--rule) solid var(--color-border);
}

.content-layout .list,
.content-layout .table-wrap {
  border-block: 0;
}

.table-wrap {
  min-width: 0;
  overflow: auto;
  border-block: var(--rule) solid var(--color-border);
}

.data-table {
  width: 100%;
  min-width: 44rem;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table th,
.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--rule) solid var(--color-border);
  text-align: left;
  vertical-align: middle;
}

.data-table th {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 700;
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table .primary-cell {
  font-size: var(--text-base);
  font-weight: 700;
}

.asset-ref {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.asset-ref svg {
  color: var(--color-brand);
}

.media-list {
  border-block: var(--rule) solid var(--color-border);
}

.media-row {
  display: grid;
  grid-template-columns: var(--control-md) minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  min-height: 4.5rem;
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--rule) solid var(--color-border);
}

.media-row:last-child {
  border-bottom: 0;
}

.media-kind {
  display: grid;
  place-items: center;
  width: var(--control-md);
  height: var(--control-md);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-brand);
}

.media-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.lesson-list-layout {
  display: grid;
  gap: var(--space-8);
}

.lesson-groups {
  display: grid;
  gap: var(--space-6);
}

.lesson-group-title {
  margin: 0 0 var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 700;
}

.lesson-layout {
  display: grid;
  gap: var(--space-6);
}

.lesson-outline {
  align-self: start;
}

.editor-area {
  min-width: 0;
}

.lesson-type {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.tab {
  min-height: var(--control-sm);
  padding-inline: var(--space-3);
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 700;
}

.tab[aria-selected="true"] {
  border-bottom-color: var(--color-brand);
  color: var(--color-text);
}

.editor-frame {
  border: var(--rule) solid var(--color-border);
  background: var(--color-surface);
}

.editor-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 3rem;
  padding: var(--space-2);
  overflow-x: auto;
  border-bottom: var(--rule) solid var(--color-border);
  background: var(--color-canvas);
}

.tool-button {
  display: inline-grid;
  min-width: var(--control-sm);
  height: var(--control-sm);
  place-items: center;
  padding-inline: var(--space-2);
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.tool-button[aria-pressed="true"] {
  background: var(--color-surface);
  color: var(--color-text);
}

.rich-text {
  min-height: 34rem;
  max-width: 46rem;
  margin-inline: auto;
  padding: clamp(var(--space-6), 6vw, var(--space-16));
  outline: 0;
}

.rich-text h2,
.rich-text h3 {
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 500;
  letter-spacing: -0.025em;
}

.rich-text h2 {
  margin: 0 0 var(--space-5);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  line-height: 1.15;
}

.rich-text h3 {
  margin: var(--space-8) 0 var(--space-3);
  font-size: var(--text-md);
}

.rich-text p,
.rich-text li {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  line-height: 1.68;
}

.binding {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border: var(--rule) solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.binding small {
  color: var(--color-text-muted);
}

.editor-footer {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-3);
  border-top: var(--rule) solid var(--color-border);
  background: var(--color-canvas);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.preview-pane {
  align-self: start;
  min-width: 0;
}

.preview-surface {
  border: var(--rule) solid var(--color-border);
  background: var(--color-surface);
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--rule) solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.preview-body {
  max-width: 36rem;
  margin-inline: auto;
  padding: var(--space-8) var(--space-5);
}

.preview-body h2 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 500;
  line-height: 1.2;
}

.preview-body p {
  color: var(--color-text-muted);
}

.preview-option {
  width: 100%;
  margin-top: var(--space-2);
  padding: var(--space-3);
  border: var(--rule) solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  text-align: left;
  transition:
    background-color var(--dur-short) var(--ease-out),
    transform var(--dur-micro) var(--ease-out);
}

.preview-option.selected {
  border-color: var(--color-brand);
  background: var(--color-surface-subtle);
}

.option-list {
  display: grid;
  gap: var(--space-3);
}

.option-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: var(--rule) solid var(--color-border);
}

.option-row:first-child {
  border-top: var(--rule) solid var(--color-border);
}

.option-index {
  display: grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 700;
}

.option-values {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.settings-stack {
  display: grid;
  gap: var(--space-8);
  max-width: 48rem;
}

.setting-group {
  border-block: var(--rule) solid var(--color-border);
}

.setting-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  min-height: 4rem;
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--rule) solid var(--color-border);
}

.setting-row:last-child {
  border-bottom: 0;
}

.setting-name {
  font-size: var(--text-sm);
  font-weight: 700;
}

.setting-detail {
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.tool-button:active,
.tab:active,
.preview-option:active {
  transform: translateY(1px);
}

.input:active,
.textarea:active,
.select:active {
  border-color: var(--color-text-muted);
}

@media (hover: hover) and (pointer: fine) {
  .nav-item:hover,
  .icon-button:hover,
  .button.ghost:hover,
  .tool-button:hover,
  .reorder-handle:hover {
    background: var(--color-surface-subtle);
    color: var(--color-text);
  }

  .button.primary:hover {
    background: var(--color-brand-hover);
  }

  .button.secondary:hover,
  .input:hover,
  .textarea:hover,
  .select:hover {
    background: var(--color-canvas);
  }

  .tab:hover,
  .preview-option:hover {
    background: var(--color-canvas);
  }

  .command-row:hover,
  .list-row:hover,
  .ordered-row:hover,
  .media-row:hover,
  .option-row:hover {
    background: var(--color-canvas);
  }
}

@media (min-width: 48rem) {
  .project-location {
    display: block;
  }

  .form-grid.two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .content-layout {
    grid-template-columns: minmax(12rem, 0.35fr) minmax(0, 1fr);
  }

  .collection-list {
    height: 100%;
    border-right: var(--rule) solid var(--color-border);
    border-bottom: 0;
  }

  .lesson-list-layout {
    grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.45fr);
  }

  .unit-header {
    grid-template-columns: var(--control-sm) 2rem minmax(0, 1fr) auto;
  }

  .unit-header > .button {
    grid-column: auto;
    justify-self: end;
  }
}

@media (min-width: 64rem) {
  .workspace {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  }

  .sidebar {
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    height: 100svh;
    align-items: stretch;
    gap: var(--space-4);
    padding: var(--space-5) var(--space-3);
    border-right: var(--rule) solid var(--color-border);
    border-bottom: 0;
  }

  .project-identity {
    padding: var(--space-2) var(--space-3) var(--space-3);
  }

  .project-name {
    font-size: var(--text-base);
  }

  .sidebar-utilities {
    order: 3;
    justify-content: space-between;
    margin-top: auto;
    padding-top: var(--space-3);
    border-top: var(--rule) solid var(--color-border);
  }

  .side-nav {
    display: flex;
    flex-direction: column;
    overflow: visible;
  }

  .sidebar-status {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding-inline: var(--space-3);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
  }

  .sidebar-status::before {
    width: 0.45rem;
    height: 0.45rem;
    border-radius: 50%;
    background: var(--color-brand);
    content: "";
  }

  .work-surface {
    min-height: 100svh;
    padding: var(--space-6);
  }

  .lesson-layout {
    grid-template-columns: minmax(12rem, 0.36fr) minmax(25rem, 1fr) minmax(
        18rem,
        0.58fr
      );
    align-items: start;
  }

  .lesson-outline,
  .preview-pane {
    position: sticky;
    top: var(--space-6);
    max-height: calc(100svh - var(--space-12));
    overflow: auto;
  }
}

@media (pointer: coarse) {
  .nav-item,
  .button,
  .icon-button,
  .tool-button,
  .tab,
  .reorder-handle {
    min-height: var(--control-md);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}