body:not([data-view='grammar']) .grammar-workspace-page {
  display: none !important;
}

body[data-view='grammar'] .grammar-workspace-page {
  display: block;
  min-width: 0;
}

.grammar-workspace-page *,
.grammar-workspace-page *::before,
.grammar-workspace-page *::after {
  box-sizing: border-box;
}

.grammar-workspace-page [hidden] {
  display: none !important;
}

.grammar-workspace-page button,
.grammar-workspace-page input,
.grammar-workspace-page select {
  font: inherit;
}

.grammar-workspace-page button {
  color: inherit;
}

.grammar-workspace-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 56px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--grammar-line);
}

.grammar-workspace-tabs {
  display: flex;
  align-items: stretch;
  gap: 24px;
  align-self: stretch;
}

.grammar-workspace-tabs button {
  position: relative;
  min-height: 56px;
  padding: 0 8px;
  border: 0;
  background: transparent;
  color: var(--color-text-soft);
  font-size: var(--type-size-emphasis);
  font-weight: var(--type-weight-medium);
  cursor: pointer;
  transition: color 150ms ease, transform 120ms ease-out;
}

.grammar-workspace-tabs button::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 3px;
  border-radius: var(--radius-pill);
  background: transparent;
  content: '';
}

.grammar-workspace-tabs button.is-active {
  color: var(--color-primary);
  font-weight: var(--type-weight-semibold);
}

.grammar-workspace-tabs button.is-active::after {
  background: var(--color-primary);
}

.grammar-header-search,
.grammar-filter-search {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
  color: var(--grammar-muted);
}

.grammar-header-search {
  width: min(280px, 38vw);
  min-height: 42px;
  padding: 0 13px;
}

.grammar-header-search svg,
.grammar-filter-search svg,
.grammar-history-row svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.grammar-header-search input,
.grammar-filter-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--color-text);
  font-size: var(--type-size-control);
}

.grammar-workspace-page[data-grammar-view='confusion'] .grammar-header-search,
.grammar-workspace-page[data-grammar-view='browse'] .grammar-header-search,
.grammar-workspace-page[data-grammar-view='detail'] .grammar-header-search,
.grammar-workspace-page[data-grammar-view='practice'] .grammar-header-search,
.grammar-workspace-page[data-grammar-view='history'] .grammar-header-search {
  display: none;
}

.grammar-workspace-page[data-grammar-view='practice'] #grammarDashboard > .grammar-home-section:not(#grammarPracticeView),
.grammar-workspace-page[data-grammar-view='practice'] #grammarHistoryRow {
  display: none !important;
}

.grammar-header-search:focus-within,
.grammar-filter-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--md-state-primary-focus);
}

.grammar-workspace-status {
  padding: 48px 0;
  color: var(--grammar-muted);
  font-size: var(--type-size-body);
  text-align: center;
}

.grammar-dashboard {
  display: grid;
  gap: 0;
}

.grammar-home-section {
  padding: 0 0 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--grammar-line);
}

.grammar-section-heading,
.grammar-view-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.grammar-section-heading {
  margin-bottom: 18px;
}

.grammar-section-heading h2,
.grammar-section-heading h3,
.grammar-view-heading h2,
.grammar-detail-section h3,
.grammar-builder-inline h3,
.grammar-practice-result h3 {
  margin: 0;
  color: var(--color-text);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-compact);
}

.grammar-section-heading h2,
.grammar-view-heading h2 {
  font-size: var(--type-size-section-title);
}

.grammar-section-heading h3,
.grammar-detail-section h3,
.grammar-builder-inline h3 {
  font-size: var(--type-size-subtitle);
}

.grammar-section-heading p,
.grammar-view-heading p,
.grammar-builder-inline p {
  margin: 5px 0 0;
  color: var(--grammar-muted);
  font-size: var(--type-size-meta);
  line-height: var(--type-line-body);
}

.grammar-text-action,
.grammar-back-action,
.grammar-load-more {
  border: 0;
  background: transparent;
  color: var(--color-primary);
  font-size: var(--type-size-control);
  font-weight: var(--type-weight-semibold);
  cursor: pointer;
}

.grammar-text-action {
  min-height: 36px;
  padding: 0;
  white-space: nowrap;
}

.grammar-confusion-view-heading {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
}

.grammar-confusion-view-heading h2,
.grammar-confusion-view-heading > span {
  margin: 0;
}

.grammar-confusion-view-heading > span {
  color: var(--grammar-muted);
  font-size: var(--type-size-meta);
}

.grammar-confusion-directory {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.grammar-confusion-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-rows: 1fr auto auto;
  column-gap: 12px;
  row-gap: 10px;
  min-height: 168px;
  padding: 18px 20px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
}

.grammar-confusion-card > strong {
  grid-column: 1;
  grid-row: 1;
  align-self: end;
  min-width: 0;
  overflow-wrap: anywhere;
  font-family: var(--type-font-ui-ja);
  font-size: var(--type-size-subtitle);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-compact);
}

.grammar-confusion-card-cue {
  grid-column: 2;
  grid-row: 1;
  align-self: start;
  color: var(--grammar-muted);
  font-size: var(--type-size-feature-title);
}

.grammar-confusion-summary {
  grid-column: 1 / -1;
  grid-row: 2;
  color: var(--grammar-muted);
  font-family: var(--type-font-ui-zh);
  font-size: var(--type-size-body);
  font-weight: var(--type-weight-regular);
  line-height: var(--type-line-body);
}

.grammar-confusion-card-footer {
  display: flex;
  grid-column: 1 / -1;
  grid-row: 3;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  min-width: 0;
  min-height: 28px;
}

.grammar-confusion-levels {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  margin-left: auto;
}

.grammar-confusion-levels small {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 9px;
  border-radius: var(--radius-sm);
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
  white-space: nowrap;
}

.grammar-confusion-saved {
  margin-right: auto;
  color: var(--color-primary);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
}

.grammar-confusion-detail-reading,
.grammar-confusion-review-reading {
  color: var(--grammar-muted);
  font-family: var(--type-font-ui-ja);
  font-size: var(--type-size-meta);
  font-weight: var(--type-weight-regular);
  line-height: var(--type-line-ui);
}

.grammar-confusion-detail-reading {
  margin-top: 8px;
}

.grammar-confusion-detail-action {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.grammar-confusion-rule {
  max-width: 760px;
  margin: 0;
  color: var(--color-text);
  font-size: var(--type-size-body-large);
  line-height: var(--type-line-body);
}

.grammar-confusion-notes {
  display: grid;
  gap: 10px;
  max-width: 780px;
  margin: 0;
  padding-left: 20px;
  color: var(--color-text-soft);
}

.grammar-confusion-review-list {
  border-top: 1px solid var(--grammar-line);
}

.grammar-confusion-review-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 12px;
  align-items: center;
  width: 100%;
  min-height: 48px;
  padding: 12px 0;
  border: 0;
  border-bottom: 1px solid var(--grammar-line);
  border-radius: 0;
  background: transparent;
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
}

.grammar-confusion-review-main {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.grammar-confusion-review-main strong {
  overflow-wrap: anywhere;
  font-family: var(--type-font-ui-ja);
  font-size: var(--type-size-emphasis);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-compact);
}

.grammar-confusion-review-label,
.grammar-confusion-review-cue {
  color: var(--grammar-muted);
  font-size: var(--type-size-control);
}

.grammar-confusion-review-label {
  white-space: nowrap;
}

.grammar-confusion-review-cue {
  font-size: var(--type-size-subtitle);
}

.grammar-confusion-review-item:hover,
.grammar-confusion-review-item:focus-visible {
  color: var(--color-primary);
}

.grammar-confusion-review-item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.grammar-related-confusions {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--grammar-line);
}

.grammar-related-confusions > h3 {
  margin: 0 0 8px;
  color: var(--color-text-soft);
  font-size: var(--type-size-body);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-compact);
}

.grammar-related-confusion-list {
  border-top: 1px solid var(--grammar-line);
}

.grammar-related-confusion-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  width: 100%;
  min-height: 52px;
  padding: 10px 0;
  border: 0;
  border-bottom: 1px solid var(--grammar-line);
  border-radius: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.grammar-related-confusion-item > span {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.grammar-related-confusion-item strong {
  overflow-wrap: anywhere;
  color: var(--color-text);
  font-family: var(--type-font-ui-ja);
  font-size: var(--type-size-emphasis);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-compact);
}

.grammar-related-confusion-item small,
.grammar-related-confusion-item > b {
  color: var(--grammar-muted);
}

.grammar-related-confusion-item small {
  font-size: var(--type-size-meta);
  line-height: var(--type-line-ui);
}

.grammar-related-confusion-item > b {
  font-size: var(--type-size-subtitle);
  font-weight: var(--type-weight-regular);
}

.grammar-related-confusion-item:hover strong,
.grammar-related-confusion-item:focus-visible strong {
  color: var(--color-primary);
}

.grammar-related-confusion-item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.grammar-diagnostic-feedback,
.grammar-confusion-feedback {
  display: grid;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--grammar-line);
}

.grammar-diagnostic-feedback > span {
  color: var(--color-primary);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
}

.grammar-diagnostic-feedback > strong {
  font-size: var(--type-size-subtitle);
}

.grammar-diagnostic-feedback > p,
.grammar-diagnostic-feedback > div,
.grammar-diagnostic-feedback > div > p {
  margin: 0;
}

.grammar-diagnostic-feedback > div {
  display: grid;
  gap: 4px;
}

.grammar-diagnostic-feedback > div > b {
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
}

.grammar-confusion-feedback > span {
  color: var(--color-primary);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
}

.grammar-confusion-feedback > strong {
  font-size: var(--type-size-subtitle);
}

.grammar-confusion-feedback > p,
.grammar-confusion-feedback > ul {
  margin: 0;
}

.grammar-confusion-feedback > ul {
  display: grid;
  gap: 6px;
  padding-left: 18px;
}

.grammar-continue-list {
  overflow: hidden;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
}

.grammar-continue-row {
  display: grid;
  grid-template-columns: 88px minmax(170px, .8fr) auto minmax(240px, 1.35fr) 24px;
  gap: 14px;
  align-items: center;
  width: 100%;
  min-height: 68px;
  padding: 12px 16px;
  border: 0;
  border-bottom: 1px solid var(--grammar-line);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: background-color 160ms ease, transform 140ms cubic-bezier(0.23, 1, 0.32, 1);
}

@media (hover: hover) and (pointer: fine) {
  .grammar-continue-row:hover {
    background: var(--grammar-soft);
  }
}

.grammar-continue-row:active {
  transform: scale(0.99);
}

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

.grammar-continue-kicker,
.grammar-continue-summary,
.grammar-inline-level,
.grammar-native-summary,
.grammar-native-pattern,
.grammar-native-progress,
.grammar-practice-heading > span {
  color: var(--grammar-muted);
  font-size: var(--type-size-meta);
}

.grammar-continue-kicker {
  font-weight: var(--type-weight-medium);
}

.grammar-continue-name,
.grammar-native-title {
  min-width: 0;
  color: var(--color-text);
  font-family: var(--type-font-content-ja);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-compact);
}

.grammar-continue-name {
  overflow: hidden;
  font-size: var(--type-size-subtitle);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.grammar-inline-level,
.grammar-native-level {
  display: inline-grid;
  place-items: center;
  min-width: 38px;
  min-height: 26px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  font-weight: var(--type-weight-semibold);
}

.grammar-continue-summary {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.grammar-row-chevron {
  color: var(--color-primary);
  font-size: var(--type-size-section-title);
  text-align: right;
}

.grammar-level-primary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.grammar-level-primary-card {
  position: relative;
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  min-height: 96px;
  padding: 16px 18px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
  text-align: left;
  cursor: pointer;
  transition: border-color 160ms ease, background-color 160ms ease, transform 140ms cubic-bezier(0.23, 1, 0.32, 1);
}

@media (hover: hover) and (pointer: fine) {
  .grammar-level-primary-card:hover {
    border-color: color-mix(in srgb, var(--color-primary) 22%, var(--grammar-line));
    background: var(--grammar-soft);
  }
}

.grammar-level-primary-card:active {
  transform: scale(0.98);
}

.grammar-level-primary-head {
  display: grid;
  gap: 3px;
}

.grammar-level-primary-head strong {
  color: var(--color-primary);
  font-size: var(--type-size-feature-title);
  line-height: var(--type-line-compact);
}

.grammar-level-primary-head span,
.grammar-level-primary-copy small,
.grammar-level-upcoming small {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-level-primary-copy {
  display: grid;
  gap: 5px;
}

.grammar-level-primary-copy b {
  color: var(--color-text);
  font-size: var(--type-size-body);
  font-weight: var(--type-weight-semibold);
}

.grammar-level-primary-action {
  color: var(--color-primary);
  font-size: var(--type-size-control);
  font-weight: var(--type-weight-semibold);
  white-space: nowrap;
}

.grammar-level-upcoming {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 12px;
  overflow: hidden;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
}

.grammar-level-upcoming button {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 12px;
  align-items: center;
  min-height: 64px;
  padding: 12px 16px;
  border: 0;
  border-right: 1px solid var(--grammar-line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.grammar-level-upcoming button:last-child {
  border-right: 0;
}

.grammar-level-upcoming button > span:first-child {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.grammar-level-upcoming button > span:nth-child(2) {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-level-upcoming b {
  color: var(--color-primary);
  font-size: var(--type-size-subtitle);
  font-weight: var(--type-weight-regular);
}

.grammar-history-row {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  width: 100%;
  min-height: 68px;
  padding: 14px 16px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
  text-align: left;
}

.grammar-history-row > span:nth-child(2) {
  display: grid;
  gap: 4px;
}

.grammar-history-row strong {
  color: var(--color-text);
  font-size: var(--type-size-body);
}

.grammar-history-row small {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-history-cta {
  min-height: 38px;
  padding: 0 13px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
  color: var(--color-primary) !important;
  font-size: var(--type-size-control);
  font-weight: var(--type-weight-semibold);
  cursor: pointer;
}

.grammar-view-heading {
  min-height: 62px;
  margin-bottom: 18px;
}

.grammar-back-action {
  min-height: 40px;
  padding: 0;
}

.grammar-filter-toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1.5fr) repeat(4, minmax(112px, .65fr));
  gap: 10px;
  align-items: end;
  padding: 14px;
  margin-bottom: 16px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
}

.grammar-filter-search {
  min-height: 44px;
  padding: 0 12px;
}

.grammar-filter-toolbar > label:not(.grammar-filter-search) {
  display: grid;
  gap: 5px;
}

.grammar-filter-toolbar > label > span {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-filter-toolbar select {
  width: 100%;
  min-height: 44px;
  padding: 0 30px 0 11px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
  color: var(--color-text);
  font-size: var(--type-size-control);
}

.grammar-native-list {
  overflow: hidden;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
}

.grammar-native-row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 84px;
  align-items: stretch;
  min-height: 86px;
  border-bottom: 1px solid var(--grammar-line);
}

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

.grammar-native-level {
  align-self: center;
  justify-self: center;
  font-size: var(--type-size-caption);
}

.grammar-native-main {
  display: grid;
  grid-template-columns: minmax(180px, .8fr) minmax(240px, 1.25fr) minmax(210px, .9fr) 24px;
  gap: 18px;
  align-items: center;
  min-width: 0;
  padding: 15px 18px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: background-color 160ms ease, transform 140ms cubic-bezier(0.23, 1, 0.32, 1);
}

@media (hover: hover) and (pointer: fine) {
  .grammar-native-main:hover {
    background: var(--grammar-soft);
  }
}

.grammar-native-main:active {
  transform: scale(0.99);
}

.grammar-native-title {
  font-size: var(--type-size-subtitle);
  overflow-wrap: anywhere;
}

.grammar-native-summary {
  color: var(--color-text-soft);
  font-size: var(--type-size-body);
  line-height: var(--type-line-body);
}

.grammar-native-pattern {
  overflow: hidden;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background: var(--grammar-soft);
  color: var(--color-text-soft);
  font-family: var(--type-font-ui-ja);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.grammar-native-progress {
  align-self: center;
  justify-self: center;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-sm);
  background: var(--grammar-paper);
  cursor: pointer;
}

.grammar-native-progress.is-learning {
  border-color: var(--md-sys-color-warning-container);
  background: var(--md-sys-color-warning-container);
  color: var(--md-sys-color-warning);
}

.grammar-native-progress.is-mastered {
  border-color: var(--md-sys-color-primary-container);
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.grammar-list-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  min-height: 64px;
}

.grammar-list-footer p {
  margin: 0;
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-load-more {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
}

.grammar-native-empty,
.grammar-practice-empty {
  padding: 40px 20px;
  color: var(--grammar-muted);
  font-size: var(--type-size-body);
  text-align: center;
}

.grammar-detail-hero {
  padding: 0 0 28px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--grammar-line);
}

.grammar-detail-title-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.grammar-detail-title-row h2 {
  min-width: 0;
  margin: 0;
  color: var(--color-text);
  font-family: var(--type-font-content-ja);
  font-size: var(--type-size-page-title);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-compact);
  overflow-wrap: anywhere;
}


.grammar-detail-hero > p {
  max-width: 780px;
  margin: 14px 0 0;
  color: var(--color-text-soft);
  font-size: var(--type-size-body-large);
  line-height: var(--type-line-body);
}

.grammar-detail-actions {
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  gap: 24px;
  margin-top: 22px;
}

.grammar-detail-status-group {
  display: grid;
  gap: 7px;
}

.grammar-detail-status-group > span {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
}

.grammar-detail-practice-group {
  padding-left: 24px;
  border-left: 1px solid var(--grammar-line);
}

.grammar-progress-segment {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
}

.grammar-progress-segment button {
  min-height: 40px;
  padding: 0 14px;
  border: 0;
  border-right: 1px solid var(--grammar-line);
  background: transparent;
  color: var(--color-text-soft);
  font-size: var(--type-size-control);
  cursor: pointer;
}

.grammar-progress-segment button:last-child {
  border-right: 0;
}

.grammar-progress-segment button.is-active {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  font-weight: var(--type-weight-semibold);
}

.grammar-detail-section {
  min-width: 0;
}

.grammar-wrong-section article {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  padding: 0;
  border: 0;
  background: transparent;
}

.grammar-error-expression,
.grammar-error-reason {
  display: grid;
  gap: 5px;
  min-width: 0;
  padding: 0;
  border-radius: 0;
  background: transparent;
}

.grammar-error-reason {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.grammar-review-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding-top: 20px;
  margin-top: 32px;
  border-top: 1px solid var(--grammar-line);
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
  text-align: center;
}

.grammar-review-note > span {
  display: inline-grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--grammar-success-soft);
  color: var(--grammar-success);
  font-weight: var(--type-weight-semibold);
}

.grammar-practice-heading {
  align-items: end;
}

.grammar-practice-setup fieldset {
  min-width: 0;
  padding: 0;
  margin: 0;
  border: 0;
}

.grammar-practice-setup legend {
  margin-bottom: 10px;
  color: var(--color-text-soft);
  font-size: var(--type-size-meta);
  font-weight: var(--type-weight-semibold);
}

.grammar-type-fieldset {
  position: relative;
}

.grammar-type-actions {
  position: absolute;
  top: -4px;
  right: 0;
  display: flex;
  gap: 10px;
}

.grammar-type-actions button {
  min-height: 28px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-primary);
  font-size: var(--type-size-caption);
  cursor: pointer;
}

.grammar-choice-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
}

.grammar-choice-grid.is-count {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 580px;
}

.grammar-choice-grid label,
.grammar-type-options label {
  cursor: pointer;
}

.grammar-choice-grid input,
.grammar-type-options input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.grammar-choice-grid span,
.grammar-type-options span {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 42px;
  padding: 7px 10px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
  color: var(--color-text-soft);
  font-size: var(--type-size-control);
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease, transform 120ms ease-out;
}

.grammar-choice-grid span small {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-choice-grid input:checked + span {
  border-color: var(--md-sys-color-primary-container);
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  font-weight: var(--type-weight-semibold);
}

.grammar-type-options input:checked + span {
  border-color: var(--color-primary);
  background: var(--grammar-paper);
  color: var(--color-text);
  font-weight: var(--type-weight-semibold);
}

.grammar-type-options input:checked + span::before {
  color: var(--color-primary);
  content: '✓';
  font-weight: var(--type-weight-semibold);
}

.grammar-choice-grid input:focus-visible + span,
.grammar-type-options input:focus-visible + span {
  outline: 3px solid var(--md-state-primary-focus);
  outline-offset: 2px;
}

.grammar-type-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.grammar-type-options span {
  min-height: 38px;
}

.grammar-practice-start {
  width: 180px;
}

.grammar-practice-start:disabled,
.grammar-answer-submit:disabled {
  border-color: var(--grammar-line);
  background: var(--grammar-soft);
  color: var(--grammar-muted) !important;
  cursor: not-allowed;
}

.grammar-builder-inline {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  width: min(100%, 820px);
  padding: 16px 18px;
  margin-top: 18px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
}

.grammar-builder-inline > div:first-child > span {
  color: var(--color-primary);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
}

.grammar-builder-action {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
  color: var(--color-primary);
  font-size: var(--type-size-control);
  font-weight: var(--type-weight-semibold);
  cursor: pointer;
}

.grammar-builder-play {
  grid-column: 1 / -1;
  display: grid;
  gap: 10px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--grammar-soft);
}

.grammar-builder-play[hidden] {
  display: none;
}

.grammar-builder-play p {
  margin: 0;
  font-family: var(--type-font-content-ja);
  font-size: var(--type-size-subtitle);
}

.grammar-builder-play > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.grammar-builder-play button,
.grammar-choice-list button,
.grammar-order-options button {
  min-height: 40px;
  padding: 0 13px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
  cursor: pointer;
}

.grammar-builder-play button.is-correct,
.grammar-choice-list button.is-correct {
  border-color: var(--md-sys-color-primary-container);
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.grammar-builder-play button.is-wrong,
.grammar-choice-list button.is-wrong {
  border-color: var(--md-sys-color-error-container);
  background: var(--md-sys-color-error-container);
  color: var(--md-sys-color-error);
}

.grammar-builder-play small {
  color: var(--color-text-soft);
  font-size: var(--type-size-meta);
}

.grammar-practice-history {
  width: min(100%, 820px);
  padding: 20px 0 0;
}

.grammar-practice-history .grammar-practice-empty {
  padding: 16px 0;
  text-align: left;
}

.grammar-practice-history-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 54px;
  padding: 10px 0;
  border-bottom: 1px solid var(--grammar-line);
}

.grammar-practice-history-row span {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.grammar-practice-history-row strong {
  color: var(--color-text);
  font-size: var(--type-size-body);
}

.grammar-practice-history-row small {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-practice-history-row b {
  color: var(--color-primary);
  font-size: var(--type-size-emphasis);
}

.grammar-session-topbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: center;
  min-height: 52px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--grammar-line);
}

.grammar-session-topbar button {
  justify-self: start;
  border: 0;
  background: transparent;
  color: var(--color-primary);
  font-size: var(--type-size-control);
  cursor: pointer;
}

.grammar-session-topbar strong {
  justify-self: end;
  font-size: var(--type-size-control);
}

.grammar-question-card {
  padding: 28px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
}

.grammar-question-meta {
  display: flex;
  gap: 8px;
}

.grammar-question-meta span {
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--grammar-soft);
  color: var(--color-text-soft);
  font-size: var(--type-size-caption);
}

.grammar-question-meta span:first-child {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.grammar-question-card > p {
  margin: 24px 0 8px;
  color: var(--grammar-muted);
  font-size: var(--type-size-meta);
}

.grammar-question-card > h3 {
  margin: 0 0 24px;
  color: var(--color-text);
  font-family: var(--type-font-content-ja);
  font-size: var(--type-size-feature-title);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-reading);
}

.grammar-question-card > h3.is-jlpt-composition {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 72px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--grammar-soft);
  font-family: var(--type-font-ui-ja);
  letter-spacing: .04em;
}

.grammar-question-card > h3.is-jlpt-composition b {
  color: var(--color-primary);
  font-size: var(--type-size-title);
}

.grammar-question-card > h3.is-jlpt-text-grammar {
  display: grid;
  gap: 10px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--grammar-soft);
  font-family: var(--type-font-content-ja);
  font-size: var(--type-size-body);
  font-weight: var(--type-weight-regular);
  line-height: 2;
}

.grammar-text-passage-title {
  color: var(--grammar-muted);
  font-family: var(--type-font-ui);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
  line-height: var(--type-line-compact);
}

.grammar-text-passage-body {
  display: block;
}

.grammar-text-blank {
  display: inline-grid;
  place-items: center;
  min-width: 30px;
  min-height: 28px;
  margin-inline: 3px;
  padding-inline: 7px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-sm);
  background: var(--grammar-paper);
  color: var(--grammar-muted);
  font-family: var(--type-font-ui);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
  line-height: 1;
  vertical-align: middle;
}

.grammar-text-blank.is-active {
  border-color: var(--color-primary);
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.grammar-choice-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.grammar-choice-list button {
  min-height: 50px;
  text-align: left;
}

.grammar-choice-list button.is-selected {
  border-color: var(--color-primary);
  background: var(--md-state-primary-hover);
}

.grammar-fill-answer {
  display: grid;
  gap: 8px;
}

.grammar-fill-answer span {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-fill-answer input {
  min-height: 48px;
  padding: 0 13px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-paper);
  color: var(--color-text);
  font-family: var(--type-font-ui-ja);
}

.grammar-order-answer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 58px;
  padding: 12px;
  border: 1px dashed var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-soft);
}

.grammar-order-answer span {
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  background: var(--grammar-paper);
  font-family: var(--type-font-ui-ja);
}

.grammar-order-answer small {
  align-self: center;
  color: var(--grammar-muted);
}

.grammar-order-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.grammar-order-reset {
  min-height: 36px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-primary);
  font-size: var(--type-size-control);
  cursor: pointer;
}

.grammar-answer-submit {
  margin-top: 24px;
}

.grammar-answer-feedback {
  display: grid;
  gap: 12px;
  padding-top: 22px;
  margin-top: 22px;
  border-top: 1px solid var(--grammar-line);
}

.grammar-answer-feedback[hidden] {
  display: none;
}

.grammar-answer-feedback > strong {
  font-size: var(--type-size-subtitle);
}

.grammar-answer-feedback > strong.is-correct {
  color: var(--md-sys-color-primary);
}

.grammar-answer-feedback > strong.is-wrong {
  color: var(--md-sys-color-error);
}

.grammar-answer-feedback > p,
.grammar-answer-feedback div p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: var(--type-size-body);
  line-height: var(--type-line-body);
}

.grammar-answer-feedback div span {
  display: block;
  margin-bottom: 4px;
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-answer-feedback > button {
  justify-self: end;
}

.grammar-practice-result {
  padding: 48px 20px;
  text-align: center;
}

.grammar-practice-result > p {
  margin: 0;
  color: var(--color-primary);
  font-size: var(--type-size-caption);
  font-weight: var(--type-weight-semibold);
}

.grammar-practice-result > strong {
  display: block;
  margin: 12px 0;
  color: var(--color-primary);
  font-size: var(--type-size-hero);
  line-height: var(--type-line-compact);
}

.grammar-practice-result > h3 {
  font-size: var(--type-size-feature-title);
}

.grammar-practice-result #grammarResultSummary {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin: 22px 0;
}

.grammar-practice-result #grammarResultSummary span {
  display: grid;
}

.grammar-practice-result #grammarResultSummary strong {
  font-size: var(--type-size-feature-title);
}

.grammar-practice-result #grammarResultSummary small,
.grammar-practice-result #grammarResultSummary p {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-practice-result #grammarResultSummary p {
  flex-basis: 100%;
  margin: 0;
}

.grammar-result-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.grammar-history-panel {
  width: min(100%, 960px);
  margin: 0 auto;
  padding: 24px;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
}

.grammar-history-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 18px;
  overflow: hidden;
  border: 1px solid var(--grammar-line);
  border-radius: var(--radius-md);
  background: var(--grammar-line);
}

.grammar-history-metric {
  display: grid;
  gap: 3px;
  padding: 14px 16px;
  background: var(--grammar-paper);
}

.grammar-history-metric strong {
  color: var(--color-text);
  font-size: var(--type-size-feature-title);
}

.grammar-history-metric span {
  color: var(--grammar-muted);
  font-size: var(--type-size-caption);
}

.grammar-history-add {
  margin-bottom: 18px;
}

.grammar-history-panel .grammar-book-list {
  display: grid;
  gap: 10px;
}

.grammar-workspace-error {
  padding: 48px 24px;
  border: 1px dashed var(--grammar-line);
  border-radius: var(--radius-lg);
  background: var(--grammar-paper);
  text-align: center;
}

.grammar-workspace-error h2 {
  margin: 0 0 8px;
  font-size: var(--type-size-section-title);
}

.grammar-workspace-error p {
  margin: 0 0 18px;
  color: var(--grammar-muted);
  font-size: var(--type-size-body);
}

.grammar-workspace-error button {
  min-height: 42px;
  padding: 0 16px;
  border: 0;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--md-sys-color-on-primary);
  cursor: pointer;
}

.grammar-workspace-page button:active,
.grammar-workspace-page label:active span {
  transform: scale(.98);
}

@media (hover: hover) and (pointer: fine) {
  .grammar-workspace-tabs button:hover,
  .grammar-text-action:hover,
  .grammar-back-action:hover,
  .grammar-load-more:hover {
    color: var(--color-primary-strong);
  }

  .grammar-continue-row:hover,
  .grammar-level-primary-card:hover,
  .grammar-level-upcoming button:hover,
  .grammar-history-row:hover,
  .grammar-native-main:hover,
  .grammar-builder-action:hover,
  .grammar-choice-list button:hover,
  .grammar-order-options button:hover {
    background: var(--md-state-primary-hover);
  }

  .grammar-level-primary-card:hover,
  .grammar-history-row:hover,
  .grammar-builder-action:hover {
    border-color: var(--color-primary);
  }
}

@media (max-width: 1120px) {
  .grammar-filter-toolbar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .grammar-filter-search {
    grid-column: 1 / -1;
  }

  .grammar-native-main {
    grid-template-columns: minmax(170px, .8fr) minmax(230px, 1.2fr) 24px;
  }

  .grammar-native-pattern {
    grid-column: 1 / span 2;
    grid-row: 2;
  }

  .grammar-native-main > .grammar-row-chevron {
    grid-column: 3;
    grid-row: 1 / span 2;
  }
}

@media (max-width: 900px) {
  .grammar-detail-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-detail-side {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grammar-review-note {
    grid-column: 1 / -1;
  }

  .grammar-continue-row {
    grid-template-columns: 110px minmax(140px, .8fr) auto minmax(180px, 1fr) 20px;
    gap: 12px;
  }
}

@media (min-width: 1101px) {
  body[data-view="grammar"] #grammarLevelPrimary.learning-course-level-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 721px) and (max-width: 1100px) {
  body[data-view="grammar"] #grammarLevelPrimary.learning-course-level-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 561px) and (max-width: 720px) {
  body[data-view="grammar"] #grammarLevelPrimary.learning-course-level-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1100px) and (min-width: 721px) {
  .grammar-confusion-directory {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .grammar-workspace-header {
    align-items: stretch;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
  }

  .grammar-workspace-tabs {
    min-height: 50px;
  }

  .grammar-workspace-tabs button {
    min-height: 50px;
  }

  .grammar-header-search {
    width: 100%;
    margin-bottom: 12px;
  }

  .grammar-section-heading,
  .grammar-view-heading,
  .grammar-detail-actions,
  .grammar-practice-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .grammar-confusion-directory {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-confusion-card {
    min-height: 148px;
  }

  .grammar-continue-row {
    grid-template-columns: minmax(0, 1fr) auto 20px;
    gap: 8px 10px;
  }

  .grammar-continue-kicker {
    grid-column: 1;
  }

  .grammar-inline-level {
    grid-column: 2;
    grid-row: 1;
  }

  .grammar-continue-name {
    grid-column: 1 / span 2;
    grid-row: 2;
  }

  .grammar-continue-summary {
    grid-column: 1 / span 2;
    grid-row: 3;
  }

  .grammar-continue-row > .grammar-row-chevron {
    grid-column: 3;
    grid-row: 1 / span 3;
    align-self: center;
  }

  .grammar-level-primary {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-level-upcoming {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-level-upcoming button {
    border-right: 0;
    border-bottom: 1px solid var(--grammar-line);
  }

  .grammar-level-upcoming button:last-child {
    border-bottom: 0;
  }

  .grammar-level-primary-card {
    grid-template-columns: 64px minmax(0, 1fr);
    grid-template-rows: auto auto;
  }

  .grammar-level-primary-action {
    grid-column: 1 / span 2;
    grid-row: 2;
  }

  .grammar-wrong-section article {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-error-reason {
    grid-column: 1;
  }

  .grammar-filter-toolbar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grammar-native-row {
    grid-template-columns: 46px minmax(0, 1fr);
    padding: 0;
  }

  .grammar-native-main {
    grid-template-columns: minmax(0, 1fr) 20px;
    gap: 7px 10px;
    padding: 14px 12px;
  }

  .grammar-native-title,
  .grammar-native-summary,
  .grammar-native-pattern {
    grid-column: 1;
  }

  .grammar-native-pattern {
    grid-row: auto;
    white-space: normal;
  }

  .grammar-native-main > .grammar-row-chevron {
    grid-column: 2;
    grid-row: 1 / span 3;
  }

  .grammar-native-progress {
    grid-column: 2;
    justify-self: start;
    margin: 0 0 12px 12px;
  }

  .grammar-detail-actions {
    align-items: stretch;
    gap: 16px;
  }

  .grammar-detail-practice-group {
    padding-top: 16px;
    padding-left: 0;
    border-top: 1px solid var(--grammar-line);
    border-left: 0;
  }

  .grammar-detail-practice {
    align-self: flex-start;
  }

  .grammar-detail-side {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-choice-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .grammar-builder-inline {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-builder-action {
    justify-self: start;
  }

  .grammar-choice-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-session-topbar {
    grid-template-columns: 1fr auto;
  }

  .grammar-session-topbar span {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: center;
  }

  .grammar-question-card {
    padding: 20px 16px;
  }
}

@media (max-width: 430px) {
  .grammar-filter-toolbar {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-filter-search {
    grid-column: auto;
  }

  .grammar-choice-grid,
  .grammar-choice-grid.is-count {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grammar-progress-segment {
    width: 100%;
  }

  .grammar-progress-segment button {
    flex: 1;
    padding-inline: 8px;
  }

  .grammar-history-metrics {
    grid-template-columns: minmax(0, 1fr);
  }

  .grammar-practice-result > div:last-child {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .grammar-workspace-page *,
  .grammar-workspace-page *::before,
  .grammar-workspace-page *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}