:root {
  --grammar-workspace-ink: #10231e;
  --grammar-workspace-muted: #68736f;
  --grammar-workspace-line: #e5e9e7;
  --grammar-workspace-soft: #f6f8f7;
  --grammar-workspace-green: #103c32;
  --grammar-workspace-green-deep: #0b2d26;
  --grammar-workspace-coral: #ed563f;
  --grammar-workspace-coral-soft: #fff4f1;
  --grammar-workspace-radius-control: 14px;
  --grammar-workspace-radius-card: 20px;
  --grammar-workspace-radius-feature: 28px;
}

body[data-page="grammar"].multipage-site {
  background: #fff;
}

body[data-page="grammar"].multipage-site .grammar-hub .shell,
body[data-page="grammar"].multipage-site .grammar-product .shell {
  width: min(1336px, calc(100% - 80px));
}

body[data-page="grammar"].multipage-site .grammar-subnav,
body[data-page="grammar"].multipage-site .grammar-product__switch.grammar-subnav {
  position: sticky;
  z-index: 180;
  top: var(--site-header-height, 86px);
  display: block;
  width: 100%;
  min-height: 52px;
  margin: 0;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--grammar-workspace-line);
  border-radius: 0;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: none;
  backdrop-filter: blur(16px);
}

body[data-page="grammar"].multipage-site .grammar-subnav__inner {
  display: flex;
  min-height: 52px;
  align-items: stretch;
  justify-content: center;
  gap: 48px;
}

body[data-page="grammar"].multipage-site .grammar-subnav a,
body[data-page="grammar"].multipage-site .grammar-product__switch a {
  position: relative;
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  padding: 0 4px;
  border: 0;
  border-radius: 0;
  color: #69736f;
  background: transparent;
  font-size: 13px;
  font-weight: 650;
  line-height: 1;
  text-decoration: none;
}

body[data-page="grammar"].multipage-site .grammar-subnav a:hover,
body[data-page="grammar"].multipage-site .grammar-product__switch a:hover {
  color: var(--grammar-workspace-ink);
  background: transparent;
}

body[data-page="grammar"].multipage-site .grammar-subnav a[aria-current="page"],
body[data-page="grammar"].multipage-site .grammar-product__switch a[aria-current="page"] {
  border: 0;
  color: var(--grammar-workspace-ink);
  background: transparent;
  box-shadow: none;
}

body[data-page="grammar"].multipage-site .grammar-subnav a[aria-current="page"]::after {
  position: absolute;
  right: 2px;
  bottom: -1px;
  left: 2px;
  height: 2px;
  border-radius: 999px;
  background: var(--grammar-workspace-coral);
  content: "";
}

/* Grammar learning workspace */
body[data-page="grammar"].multipage-site .grammar-product {
  padding: 0 0 72px;
  background: #fff;
}

body[data-page="grammar"].multipage-site .grammar-workspace__toolbar {
  display: grid;
  min-height: 108px;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 420px);
  align-items: center;
  gap: 48px;
}

body[data-page="grammar"].multipage-site .grammar-workspace__heading > div {
  display: flex;
  align-items: baseline;
  gap: 18px;
}

body[data-page="grammar"].multipage-site .grammar-workspace__heading h1 {
  margin: 0;
  color: var(--grammar-workspace-ink);
  font-family: var(--sans, Inter, sans-serif);
  font-size: clamp(25px, 2.25vw, 32px);
  font-weight: 720;
  letter-spacing: -0.045em;
  line-height: 1.05;
}

body[data-page="grammar"].multipage-site .grammar-workspace__heading strong {
  color: #707a76;
  font-size: 11px;
  font-weight: 620;
}

body[data-page="grammar"].multipage-site .grammar-workspace__progress {
  display: block;
  width: min(100%, 510px);
  height: 3px;
  margin-top: 14px;
  overflow: hidden;
  border-radius: 999px;
  background: #edf0ee;
}

body[data-page="grammar"].multipage-site .grammar-workspace__progress > span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--grammar-workspace-coral);
  transition: width 220ms ease;
}

body[data-page="grammar"].multipage-site .grammar-workspace__search {
  display: grid;
  min-height: 46px;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 11px;
  padding: 0 13px 0 15px;
  border: 1px solid #dfe4e1;
  border-radius: var(--grammar-workspace-radius-control);
  color: #78817e;
  background: #fff;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

body[data-page="grammar"].multipage-site .grammar-workspace__search:focus-within {
  border-color: rgba(16, 60, 50, 0.48);
  box-shadow: 0 0 0 4px rgba(16, 60, 50, 0.07);
}

body[data-page="grammar"].multipage-site .grammar-workspace__search > .ph {
  color: var(--grammar-workspace-green);
  font-size: 17px;
}

body[data-page="grammar"].multipage-site .grammar-workspace__search input {
  min-width: 0;
  border: 0;
  outline: 0;
  color: var(--grammar-workspace-ink);
  background: transparent;
  font: 500 13px/1.2 var(--sans, Inter, sans-serif);
}

body[data-page="grammar"].multipage-site .grammar-workspace__search input::placeholder {
  color: #8b9490;
}

body[data-page="grammar"].multipage-site .grammar-workspace__search kbd {
  padding: 4px 6px;
  border: 1px solid #e0e4e2;
  border-radius: 6px;
  color: #7a837f;
  background: #f8f9f8;
  font: 600 10px/1 var(--sans, Inter, sans-serif);
}

body[data-page="grammar"].multipage-site .grammar-product__layout {
  display: grid;
  height: calc(100vh - 246px);
  min-height: 720px;
  max-height: 790px;
  grid-template-columns: minmax(610px, 660px) minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid #dfe4e1;
  border-radius: var(--grammar-workspace-radius-control);
  background: #fff;
  box-shadow: 0 22px 58px rgba(20, 47, 40, 0.065);
}

body[data-page="grammar"].multipage-site .grammar-product__directory {
  display: grid;
  min-width: 0;
  grid-template-columns: minmax(290px, 1fr) minmax(290px, 1fr);
  overflow: hidden;
  border: 0;
  border-right: 1px solid var(--grammar-workspace-line);
  background: #fff;
}

body[data-page="grammar"].multipage-site [data-grammar-categories],
body[data-page="grammar"].multipage-site [data-grammar-topics] {
  min-width: 0;
  overflow: hidden;
}

body[data-page="grammar"].multipage-site [data-grammar-categories] {
  border-right: 1px solid var(--grammar-workspace-line);
}

body[data-page="grammar"].multipage-site .grammar-category-nav__heading,
body[data-page="grammar"].multipage-site .grammar-topic-list__heading {
  display: flex;
  min-height: 66px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 20px;
  border-bottom: 1px solid var(--grammar-workspace-line);
}

body[data-page="grammar"].multipage-site .grammar-category-nav__heading span,
body[data-page="grammar"].multipage-site .grammar-topic-list__heading span {
  color: var(--grammar-workspace-ink);
  font-size: 11px;
  font-weight: 680;
  letter-spacing: -0.01em;
}

body[data-page="grammar"].multipage-site .grammar-category-nav__heading small,
body[data-page="grammar"].multipage-site .grammar-topic-list__heading small {
  color: #8a938f;
  font-size: 10px;
  font-weight: 520;
}

body[data-page="grammar"].multipage-site .grammar-category-nav__items {
  display: grid;
  padding: 8px 0;
}

body[data-page="grammar"].multipage-site .grammar-category-nav__items button {
  position: relative;
  display: grid;
  min-height: 64px;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 0 18px;
  border: 0;
  border-radius: 0;
  color: var(--grammar-workspace-ink);
  background: transparent;
  box-shadow: none;
  font-family: var(--sans, Inter, sans-serif);
  text-align: left;
  cursor: pointer;
}

body[data-page="grammar"].multipage-site .grammar-category-nav__items button::before {
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 0;
  width: 3px;
  border-radius: 0 999px 999px 0;
  background: transparent;
  content: "";
}

body[data-page="grammar"].multipage-site .grammar-category-nav__items button:hover {
  background: #fafbfa;
}

body[data-page="grammar"].multipage-site .grammar-category-nav__items button.is-active {
  color: var(--grammar-workspace-ink);
  background: var(--grammar-workspace-coral-soft);
  box-shadow: none;
}

body[data-page="grammar"].multipage-site .grammar-category-nav__items button.is-active::before {
  background: var(--grammar-workspace-coral);
}

body[data-page="grammar"].multipage-site .grammar-category-nav__items button span,
body[data-page="grammar"].multipage-site .grammar-category-nav__items button small {
  color: #929a96;
  font-size: 10px;
  font-weight: 570;
}

body[data-page="grammar"].multipage-site .grammar-category-nav__items button strong {
  display: -webkit-box;
  min-width: 0;
  overflow: hidden;
  color: inherit;
  font-size: 12px;
  font-weight: 650;
  line-height: 1.35;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

body[data-page="grammar"].multipage-site .grammar-topic-list__heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
}

body[data-page="grammar"].multipage-site .grammar-topic-list__heading strong {
  min-width: 0;
  overflow: hidden;
  color: var(--grammar-workspace-ink);
  font-size: 11px;
  font-weight: 690;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

body[data-page="grammar"].multipage-site .grammar-topic-list {
  max-height: calc(100% - 66px);
  overflow-y: auto;
  border: 0;
  scrollbar-color: #cbd1ce transparent;
  scrollbar-width: thin;
}

body[data-page="grammar"].multipage-site .grammar-topic-list button {
  position: relative;
  display: grid;
  width: 100%;
  min-height: 72px;
  grid-template-columns: 26px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 8px;
  padding: 10px 15px 10px 18px;
  border: 0;
  border-bottom: 1px solid #edf0ee;
  border-radius: 0;
  color: var(--grammar-workspace-ink);
  background: #fff;
  text-align: left;
  cursor: pointer;
}

body[data-page="grammar"].multipage-site .grammar-topic-list button:hover {
  background: #fafbfa;
}

body[data-page="grammar"].multipage-site .grammar-topic-list button.is-active {
  color: var(--grammar-workspace-ink);
  background: var(--grammar-workspace-coral-soft);
  box-shadow: inset 2px 0 var(--grammar-workspace-coral);
}

body[data-page="grammar"].multipage-site .grammar-topic-list button > span:first-child {
  color: #9aa29e;
  font-size: 10px;
  font-weight: 560;
}

body[data-page="grammar"].multipage-site .grammar-topic-list button strong {
  display: -webkit-box;
  overflow: hidden;
  color: inherit;
  font-size: 12px;
  font-weight: 650;
  line-height: 1.35;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

body[data-page="grammar"].multipage-site .grammar-topic-list button small {
  display: block;
  margin-top: 3px;
  overflow: hidden;
  color: #7b8581;
  font-size: 10px;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

body[data-page="grammar"].multipage-site .grammar-topic-list button i {
  color: #89928e;
  font-size: 9px;
  font-weight: 560;
  font-style: normal;
  white-space: nowrap;
}

body[data-page="grammar"].multipage-site .grammar-topic-list button.is-complete i {
  display: grid;
  width: 17px;
  height: 17px;
  place-items: center;
  border: 1px solid var(--grammar-workspace-green);
  border-radius: 50%;
  color: #fff;
  background: var(--grammar-workspace-green);
}

body[data-page="grammar"].multipage-site .grammar-topic-list__empty {
  padding: 36px 22px;
  color: var(--grammar-workspace-muted);
  font-size: 12px;
  line-height: 1.6;
}

body[data-page="grammar"].multipage-site .grammar-product__lesson {
  min-width: 0;
  overflow-y: auto;
  padding: 28px 30px 0;
  background: #fff;
  scrollbar-color: #cbd1ce transparent;
  scrollbar-width: thin;
}

body[data-page="grammar"].multipage-site .grammar-lesson__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 22px;
  padding-bottom: 22px;
}

body[data-page="grammar"].multipage-site .grammar-lesson__head small {
  color: var(--grammar-workspace-coral);
  font-size: 9px;
  font-weight: 760;
  letter-spacing: 0.13em;
}

body[data-page="grammar"].multipage-site .grammar-lesson__head h2 {
  max-width: 760px;
  margin: 10px 0 8px;
  color: var(--grammar-workspace-ink);
  font-family: var(--sans, Inter, sans-serif);
  font-size: clamp(28px, 2.8vw, 38px);
  font-weight: 710;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

body[data-page="grammar"].multipage-site .grammar-lesson__head h2 span {
  display: inline-block;
  margin-left: 10px;
  color: var(--grammar-workspace-coral);
  font-size: 0.48em;
  font-weight: 630;
  letter-spacing: 0;
}

body[data-page="grammar"].multipage-site .grammar-lesson__head p {
  max-width: 690px;
  margin: 0;
  color: var(--grammar-workspace-muted);
  font-size: 13px;
  line-height: 1.58;
}

body[data-page="grammar"].multipage-site .grammar-lesson__duration {
  display: inline-flex;
  height: 28px;
  align-items: center;
  gap: 6px;
  padding: 0 9px;
  border: 1px solid var(--grammar-workspace-line);
  border-radius: 999px;
  color: #707a76;
  background: #fff;
  font-size: 10px;
  white-space: nowrap;
}

body[data-page="grammar"].multipage-site .grammar-model {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 24px;
  padding: 24px 24px 22px;
  border: 0;
  border-radius: var(--grammar-workspace-radius-card);
  color: #fff;
  background: var(--grammar-workspace-green);
  box-shadow: none;
}

body[data-page="grammar"].multipage-site .grammar-model span,
body[data-page="grammar"].multipage-site .grammar-model strong,
body[data-page="grammar"].multipage-site .grammar-model em,
body[data-page="grammar"].multipage-site .grammar-model small {
  display: block;
}

body[data-page="grammar"].multipage-site .grammar-model span {
  margin-bottom: 11px;
  color: #b9d0c9;
  font-size: 9px;
  font-weight: 760;
  letter-spacing: 0.14em;
}

body[data-page="grammar"].multipage-site .grammar-model strong {
  color: #fff;
  font-family: var(--grammar-serif, serif);
  font-size: clamp(29px, 2.6vw, 36px);
  font-weight: 500;
  line-height: 1.2;
}

body[data-page="grammar"].multipage-site .grammar-model em {
  margin: 7px 0 3px;
  color: #ffad9e;
  font-size: 13px;
  font-style: normal;
}

body[data-page="grammar"].multipage-site .grammar-model small {
  color: #d4e2dd;
  font-size: 12px;
}

body[data-page="grammar"].multipage-site .grammar-model__actions {
  display: flex;
  align-items: center;
  gap: 7px;
}

body[data-page="grammar"].multipage-site .grammar-model button {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  gap: 6px;
  padding: 0 11px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  color: #fff;
  background: rgba(255, 255, 255, 0.07);
  font-family: var(--sans, Inter, sans-serif);
  font-size: 10px;
  font-weight: 620;
  cursor: pointer;
}

body[data-page="grammar"].multipage-site .grammar-model button:hover,
body[data-page="grammar"].multipage-site .grammar-model button:focus-visible {
  border-color: rgba(255, 255, 255, 0.54);
  background: rgba(255, 255, 255, 0.13);
}

body[data-page="grammar"].multipage-site .grammar-model button[aria-pressed="false"] {
  color: #c9d7d2;
  opacity: 0.75;
}

body[data-page="grammar"].multipage-site .grammar-model button.is-playing {
  border-color: #ffad9e;
  color: #ffcabf;
  background: rgba(237, 86, 63, 0.12);
}

body[data-page="grammar"].multipage-site .grammar-lesson__section {
  padding: 22px 0;
  border-bottom: 1px solid var(--grammar-workspace-line);
}

body[data-page="grammar"].multipage-site .grammar-lesson__section > span,
body[data-page="grammar"].multipage-site .grammar-explanation-section__heading > div > span {
  color: var(--grammar-workspace-coral);
  font-size: 9px;
  font-weight: 760;
  letter-spacing: 0.14em;
}

body[data-page="grammar"].multipage-site .grammar-lesson__section h3 {
  margin: 8px 0 10px;
  color: var(--grammar-workspace-ink);
  font-size: 18px;
  font-weight: 690;
  letter-spacing: -0.025em;
}

body[data-page="grammar"].multipage-site .grammar-lesson__section p {
  margin: 0;
  color: #59645f;
  font-size: 13px;
  line-height: 1.65;
}

body[data-page="grammar"].multipage-site .grammar-mistake {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 13px 0 12px;
}

body[data-page="grammar"].multipage-site .grammar-mistake > div {
  padding: 14px 15px;
  border: 1px solid var(--grammar-workspace-line);
  border-radius: var(--grammar-workspace-radius-control);
  background: #fff;
}

body[data-page="grammar"].multipage-site .grammar-mistake > div:first-child {
  background: #fafbfa;
}

body[data-page="grammar"].multipage-site .grammar-mistake > div:last-child {
  border-color: #d5e3de;
  background: #f3f8f6;
}

body[data-page="grammar"].multipage-site .grammar-mistake span {
  display: block;
  margin-bottom: 7px;
  color: #7d8782;
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.13em;
}

body[data-page="grammar"].multipage-site .grammar-mistake > div:last-child span {
  color: var(--grammar-workspace-green);
}

body[data-page="grammar"].multipage-site .grammar-mistake strong {
  color: var(--grammar-workspace-ink);
  font-size: 15px;
  font-weight: 640;
}

body[data-page="grammar"].multipage-site .grammar-lesson__more {
  border-bottom: 1px solid var(--grammar-workspace-line);
}

body[data-page="grammar"].multipage-site .grammar-lesson__more > summary {
  display: flex;
  min-height: 54px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--grammar-workspace-ink);
  font-size: 12px;
  font-weight: 660;
  list-style: none;
  cursor: pointer;
}

body[data-page="grammar"].multipage-site .grammar-lesson__more > summary::-webkit-details-marker {
  display: none;
}

body[data-page="grammar"].multipage-site .grammar-lesson__more > summary .ph {
  transition: transform 160ms ease;
}

body[data-page="grammar"].multipage-site .grammar-lesson__more[open] > summary .ph {
  transform: rotate(45deg);
}

body[data-page="grammar"].multipage-site .grammar-lesson__more-content {
  padding: 0 0 22px;
}

body[data-page="grammar"].multipage-site .grammar-note-grid,
body[data-page="grammar"].multipage-site .grammar-example-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

body[data-page="grammar"].multipage-site .grammar-note-grid {
  margin: 0 0 18px;
}

body[data-page="grammar"].multipage-site .grammar-note-grid > div,
body[data-page="grammar"].multipage-site .grammar-example-grid > div {
  padding: 15px;
  border: 1px solid var(--grammar-workspace-line);
  border-radius: var(--grammar-workspace-radius-control);
  background: #fff;
}

body[data-page="grammar"].multipage-site .grammar-note-grid strong,
body[data-page="grammar"].multipage-site .grammar-example-grid strong,
body[data-page="grammar"].multipage-site .grammar-example-grid em,
body[data-page="grammar"].multipage-site .grammar-example-grid small {
  display: block;
}

body[data-page="grammar"].multipage-site .grammar-note-grid strong {
  color: var(--grammar-workspace-ink);
  font-size: 11px;
}

body[data-page="grammar"].multipage-site .grammar-note-grid p {
  margin-top: 6px;
  font-size: 11px;
  line-height: 1.55;
}

body[data-page="grammar"].multipage-site .grammar-example-grid strong {
  color: var(--grammar-workspace-ink);
  font: 600 18px/1.35 var(--grammar-serif, serif);
}

body[data-page="grammar"].multipage-site .grammar-example-grid em {
  margin: 6px 0 3px;
  color: var(--grammar-workspace-coral);
  font-size: 11px;
  font-style: normal;
}

body[data-page="grammar"].multipage-site .grammar-example-grid small {
  color: var(--grammar-workspace-muted);
  font-size: 10px;
}

body[data-page="grammar"].multipage-site .grammar-explanation-section__heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 16px;
}

body[data-page="grammar"].multipage-site .grammar-explanation-section__heading > div {
  min-width: 0;
}

body[data-page="grammar"].multipage-site .grammar-explanation-section__heading button {
  display: inline-flex;
  min-height: 38px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 14px;
  border: 1px solid #d5dfdb;
  border-radius: 999px;
  color: var(--grammar-workspace-green);
  background: #fff;
  font-family: var(--sans, Inter, sans-serif);
  font-size: 10px;
  font-weight: 690;
  cursor: pointer;
}

body[data-page="grammar"].multipage-site .grammar-explanation-section__heading button:hover,
body[data-page="grammar"].multipage-site .grammar-explanation-section__heading button:focus-visible,
body[data-page="grammar"].multipage-site .grammar-explanation-section__heading button[aria-pressed="true"] {
  border-color: #aac0b8;
  background: var(--grammar-workspace-soft);
}

body[data-page="grammar"].multipage-site .grammar-explanation-section__heading button:focus-visible {
  outline: 3px solid rgba(233, 111, 84, 0.28);
  outline-offset: 3px;
}

body[data-page="grammar"].multipage-site .grammar-explanation-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

body[data-page="grammar"].multipage-site .grammar-lesson__cards {
  display: grid;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--grammar-workspace-line);
}

body[data-page="grammar"].multipage-site .grammar-lesson__cards .grammar-content-block {
  margin: 0;
}

body[data-page="grammar"].multipage-site .grammar-lesson__cards .grammar-content-block > header {
  margin-bottom: 12px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card,
body[data-page="grammar"].multipage-site .grammar-note-grid > .grammar-flip-card,
body[data-page="grammar"].multipage-site .grammar-example-grid > .grammar-flip-card {
  min-width: 0;
  padding: 0;
  border: 0;
  border-radius: 18px;
  background: transparent;
  perspective: 1200px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__button {
  display: block;
  width: 100%;
  min-height: 224px;
  padding: 0;
  border: 0;
  border-radius: 18px;
  color: inherit;
  background: transparent;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--note .grammar-flip-card__button {
  min-height: 178px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--example .grammar-flip-card__button {
  min-height: 164px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__inner {
  position: relative;
  display: grid;
  min-height: inherit;
  transform-style: preserve-3d;
  transition: transform 420ms cubic-bezier(0.2, 0.74, 0.24, 1);
}

body[data-page="grammar"].multipage-site .grammar-flip-card__button.is-flipped .grammar-flip-card__inner {
  transform: rotateY(180deg);
}

body[data-page="grammar"].multipage-site .grammar-flip-card__face {
  display: flex;
  min-width: 0;
  min-height: inherit;
  grid-area: 1 / 1;
  flex-direction: column;
  padding: 22px;
  overflow: auto;
  border: 1px solid var(--grammar-workspace-line);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 14px 34px rgba(23, 63, 53, 0.055);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__front {
  background: linear-gradient(145deg, #ffffff 0%, #f7faf8 100%);
}

body[data-page="grammar"].multipage-site .grammar-flip-card--mistake .grammar-flip-card__front {
  background: linear-gradient(145deg, #ffffff 0%, #fbf7f6 100%);
}

body[data-page="grammar"].multipage-site .grammar-flip-card__back {
  border-color: #cfded8;
  background: #173f35;
  transform: rotateY(180deg);
}

body[data-page="grammar"].multipage-site .grammar-flip-card__face > small:first-child {
  color: var(--grammar-workspace-coral);
  font-size: 8px;
  font-weight: 780;
  letter-spacing: 0.15em;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__face > strong {
  display: block;
  margin-top: 15px;
  color: var(--grammar-workspace-ink);
  font-size: 18px;
  font-weight: 690;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__front > span:not(.grammar-mistake) {
  margin-top: 8px;
  color: var(--grammar-workspace-muted);
  font-size: 13px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__face > em,
body[data-page="grammar"].multipage-site .grammar-flip-card__face > i {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: auto;
  padding-top: 18px;
  color: var(--grammar-workspace-green);
  font-size: 10px;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 0.02em;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__back > small:first-child {
  color: #ffad9e;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__back > span:not(.ph) {
  display: block;
  margin-top: 16px;
  color: #f4f8f6;
  font-size: 13px;
  line-height: 1.7;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__back > em,
body[data-page="grammar"].multipage-site .grammar-flip-card__back > i {
  color: #c3d8d0;
}

body[data-page="grammar"].multipage-site .grammar-flip-card__button:hover .grammar-flip-card__front {
  border-color: #bfcec8;
  box-shadow: 0 18px 42px rgba(23, 63, 53, 0.09);
}

body[data-page="grammar"].multipage-site .grammar-flip-card__button:focus-visible {
  outline: 3px solid rgba(233, 111, 84, 0.28);
  outline-offset: 4px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--mistake .grammar-mistake {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 14px 0 0;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--mistake .grammar-mistake > span {
  display: block;
  min-width: 0;
  padding: 10px 11px;
  border: 1px solid var(--grammar-workspace-line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.72);
}

body[data-page="grammar"].multipage-site .grammar-flip-card--mistake .grammar-mistake > span:last-child {
  border-color: #d5e3de;
  background: #f3f8f6;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--mistake .grammar-mistake small,
body[data-page="grammar"].multipage-site .grammar-flip-card--mistake .grammar-mistake b {
  display: block;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--mistake .grammar-mistake small {
  margin-bottom: 5px;
  color: #8b7772;
  font-size: 7px;
  font-weight: 780;
  letter-spacing: 0.12em;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--mistake .grammar-mistake b {
  overflow: hidden;
  color: var(--grammar-workspace-ink);
  font-size: 12px;
  font-weight: 650;
  text-overflow: ellipsis;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--note .grammar-flip-card__face,
body[data-page="grammar"].multipage-site .grammar-flip-card--example .grammar-flip-card__face {
  padding: 18px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--note .grammar-flip-card__face > strong {
  font-size: 15px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--example .grammar-flip-card__front > strong {
  font: 600 24px/1.3 var(--grammar-serif, serif);
}

body[data-page="grammar"].multipage-site .grammar-flip-card--example .grammar-flip-card__back > em[data-grammar-pinyin] {
  margin-top: 17px;
  padding: 0;
  color: #ffb7aa;
  font-size: 13px;
}

body[data-page="grammar"].multipage-site .grammar-flip-card--example .grammar-flip-card__back > span {
  margin-top: 8px;
}

body[data-page="grammar"].multipage-site .grammar-lesson__footer {
  position: sticky;
  z-index: 2;
  bottom: 0;
  display: grid;
  min-height: 72px;
  grid-template-columns: auto auto auto 1fr;
  align-items: center;
  gap: 9px;
  margin: 0 -30px;
  padding: 12px 30px;
  border-top: 1px solid var(--grammar-workspace-line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

body[data-page="grammar"].multipage-site .grammar-lesson__footer button,
body[data-page="grammar"].multipage-site .grammar-lesson__footer a {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 14px;
  border: 1px solid #dce2df;
  border-radius: 999px;
  color: var(--grammar-workspace-ink);
  background: #fff;
  font: 650 10px/1 var(--sans, Inter, sans-serif);
  text-decoration: none;
  cursor: pointer;
}

body[data-page="grammar"].multipage-site .grammar-lesson__footer .grammar-lesson__complete {
  border-color: #dce2df;
  color: var(--grammar-workspace-ink);
  background: #fff;
}

body[data-page="grammar"].multipage-site .grammar-lesson__footer a {
  border-color: var(--grammar-workspace-green);
  color: #fff;
  background: var(--grammar-workspace-green);
}

body[data-page="grammar"].multipage-site .grammar-lesson__footer button:hover,
body[data-page="grammar"].multipage-site .grammar-lesson__footer a:hover {
  border-color: var(--grammar-workspace-green);
}

body[data-page="grammar"].multipage-site .grammar-lesson__footer small {
  justify-self: end;
  color: #7d8782;
  font-size: 9px;
}

/* Grammar overview */
body[data-page="grammar"].multipage-site .grammar-hub__hero {
  padding: 64px 0 0;
  border: 0;
  background: #fff;
}

body[data-page="grammar"].multipage-site .grammar-hub__intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 390px);
  align-items: end;
  gap: 64px;
  margin-bottom: 34px;
}

body[data-page="grammar"].multipage-site .grammar-hub__hero .kicker,
body[data-page="grammar"].multipage-site .grammar-hub__modules .kicker {
  color: var(--grammar-workspace-coral);
}

body[data-page="grammar"].multipage-site .grammar-hub__intro h1 {
  max-width: 760px;
  margin: 13px 0 15px;
  color: var(--grammar-workspace-ink);
  font-family: var(--sans, Inter, sans-serif);
  font-size: clamp(46px, 5.5vw, 72px);
  font-weight: 720;
  letter-spacing: -0.065em;
  line-height: 0.98;
}

body[data-page="grammar"].multipage-site .grammar-hub__intro p {
  max-width: 620px;
  margin: 0;
  color: var(--grammar-workspace-muted);
  font-size: 15px;
  line-height: 1.68;
}

body[data-page="grammar"].multipage-site .grammar-hub__progress {
  padding-bottom: 6px;
}

body[data-page="grammar"].multipage-site .grammar-hub__progress strong {
  display: block;
  margin-bottom: 13px;
  color: var(--grammar-workspace-ink);
  font-size: 12px;
  font-weight: 650;
}

body[data-page="grammar"].multipage-site .grammar-hub__progress > span {
  display: block;
  height: 4px;
  overflow: hidden;
  border-radius: 999px;
  background: #ecefed;
}

body[data-page="grammar"].multipage-site .grammar-hub__progress > span > span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--grammar-workspace-coral);
  transition: width 220ms ease;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue,
body[data-page="grammar"].multipage-site .grammar-hub__hero article.grammar-hub__continue {
  display: grid;
  min-height: 330px;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  align-items: stretch;
  gap: 0;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: var(--grammar-workspace-radius-feature);
  color: #fff;
  background: var(--grammar-workspace-green);
  box-shadow: none;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue > div {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 46px 52px;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue .micro-label {
  margin-bottom: 25px;
  color: #ffad9e;
  font-size: 9px;
  font-weight: 760;
  letter-spacing: 0.15em;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue small {
  color: #bdd1ca;
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.06em;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue h2 {
  max-width: 650px;
  margin: 12px 0 13px;
  color: #fff;
  font-family: var(--sans, Inter, sans-serif);
  font-size: clamp(32px, 3.6vw, 48px);
  font-weight: 690;
  letter-spacing: -0.05em;
  line-height: 1.04;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue h2 em {
  display: block;
  margin-top: 9px;
  color: #ffad9e;
  font-size: 0.42em;
  font-style: normal;
  font-weight: 620;
  letter-spacing: 0;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue p {
  max-width: 620px;
  margin: 0 0 26px;
  color: #d1dfda;
  font-size: 13px;
  line-height: 1.65;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue .button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  padding: 0 18px;
  border: 1px solid #fff;
  border-radius: 999px;
  color: var(--grammar-workspace-ink);
  background: #fff;
  box-shadow: none;
  font-size: 11px;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue blockquote {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  margin: 0;
  padding: 44px 48px;
  border-left: 1px solid rgba(255, 255, 255, 0.13);
  background: var(--grammar-workspace-green-deep);
}

body[data-page="grammar"].multipage-site .grammar-hub__continue blockquote > * {
  display: block;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue blockquote span {
  margin-bottom: 20px;
  color: #a9c2ba;
  font-size: 9px;
  font-weight: 760;
  letter-spacing: 0.15em;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue blockquote strong {
  color: #fff;
  font-family: var(--grammar-serif, serif);
  font-size: clamp(31px, 3.6vw, 48px);
  font-weight: 500;
  line-height: 1.2;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue blockquote em {
  margin: 12px 0 6px;
  color: #ffad9e;
  font-size: 14px;
  font-style: normal;
}

body[data-page="grammar"].multipage-site .grammar-hub__continue blockquote small {
  color: #cfddd8;
  font-size: 12px;
  letter-spacing: 0;
}

body[data-page="grammar"].multipage-site .grammar-hub__modules {
  padding: 78px 0 88px;
}

body[data-page="grammar"].multipage-site .grammar-hub__modules > header {
  display: grid;
  max-width: none;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 450px);
  align-items: end;
  gap: 60px;
  margin-bottom: 30px;
}

body[data-page="grammar"].multipage-site .grammar-hub__modules > header h2 {
  margin: 11px 0 0;
  font-family: var(--sans, Inter, sans-serif);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 710;
  letter-spacing: -0.05em;
}

body[data-page="grammar"].multipage-site .grammar-hub__grid {
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--grammar-workspace-line);
  border-radius: var(--grammar-workspace-radius-card);
}

body[data-page="grammar"].multipage-site .grammar-hub__card,
body[data-page="grammar"].multipage-site .grammar-hub__card--advanced {
  min-height: 264px;
  gap: 20px;
  padding: 32px 34px;
  border: 0;
  border-radius: 0;
  color: var(--grammar-workspace-ink);
  background: #fff;
  box-shadow: none;
}

body[data-page="grammar"].multipage-site .grammar-hub__card + .grammar-hub__card {
  border-top: 0;
  border-left: 1px solid var(--grammar-workspace-line);
}

body[data-page="grammar"].multipage-site .grammar-hub__card:hover,
body[data-page="grammar"].multipage-site .grammar-hub__card:focus-visible,
body[data-page="grammar"].multipage-site .grammar-hub__card--advanced:hover,
body[data-page="grammar"].multipage-site .grammar-hub__card--advanced:focus-visible {
  color: var(--grammar-workspace-ink);
  background: var(--grammar-workspace-soft);
  box-shadow: none;
  transform: none;
}

body[data-page="grammar"].multipage-site .grammar-hub__card--advanced .grammar-hub__number,
body[data-page="grammar"].multipage-site .grammar-hub__number {
  border-color: #d7dfdb;
  color: var(--grammar-workspace-green);
}

body[data-page="grammar"].multipage-site .grammar-hub__card small,
body[data-page="grammar"].multipage-site .grammar-hub__card--advanced small,
body[data-page="grammar"].multipage-site .grammar-hub__card p,
body[data-page="grammar"].multipage-site .grammar-hub__card--advanced p {
  color: var(--grammar-workspace-muted);
}

body[data-page="grammar"].multipage-site .grammar-hub__card h2 {
  font-family: var(--sans, Inter, sans-serif);
  font-size: clamp(27px, 2.7vw, 38px);
  font-weight: 700;
}

body[data-page="grammar"].multipage-site .grammar-hub__card--advanced h2 em,
body[data-page="grammar"].multipage-site .grammar-hub__card h2 em {
  color: var(--grammar-workspace-coral);
}

body[data-page="grammar"].multipage-site .grammar-hub__card > strong,
body[data-page="grammar"].multipage-site .grammar-hub__card--advanced > strong {
  color: var(--grammar-workspace-green);
}

@media (max-width: 1080px) {
  body[data-page="grammar"].multipage-site .grammar-product__layout {
    grid-template-columns: minmax(430px, 0.9fr) minmax(0, 1.1fr);
  }

  body[data-page="grammar"].multipage-site .grammar-product__directory {
    grid-template-columns: minmax(205px, 0.9fr) minmax(220px, 1.1fr);
  }

  body[data-page="grammar"].multipage-site .grammar-category-nav__items button {
    grid-template-columns: 22px minmax(0, 1fr) auto;
    padding-inline: 14px;
  }

  body[data-page="grammar"].multipage-site .grammar-model {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  body[data-page="grammar"].multipage-site .grammar-hub .shell,
  body[data-page="grammar"].multipage-site .grammar-product .shell {
    width: min(100% - 32px, 720px);
  }

  body[data-page="grammar"].multipage-site .grammar-subnav,
  body[data-page="grammar"].multipage-site .grammar-product__switch.grammar-subnav {
    top: var(--site-header-height, 74px);
  }

  body[data-page="grammar"].multipage-site .grammar-subnav__inner {
    width: 100%;
    justify-content: flex-start;
    gap: 28px;
    overflow-x: auto;
    padding: 0 16px;
    scrollbar-width: none;
  }

  body[data-page="grammar"].multipage-site .grammar-subnav__inner::-webkit-scrollbar {
    display: none;
  }

  body[data-page="grammar"].multipage-site .grammar-subnav a,
  body[data-page="grammar"].multipage-site .grammar-product__switch a {
    flex: 0 0 auto;
    min-height: 52px;
    padding: 0 2px;
    font-size: 12px;
  }

  body[data-page="grammar"].multipage-site .grammar-workspace__toolbar {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 21px;
    padding: 26px 0 24px;
  }

  body[data-page="grammar"].multipage-site .grammar-workspace__heading > div {
    justify-content: space-between;
  }

  body[data-page="grammar"].multipage-site .grammar-workspace__search {
    min-height: 48px;
  }

  body[data-page="grammar"].multipage-site .grammar-product__layout {
    height: auto;
    min-height: 0;
    max-height: none;
    grid-template-columns: 1fr;
    overflow: visible;
    border-radius: var(--grammar-workspace-radius-card);
  }

  body[data-page="grammar"].multipage-site .grammar-product__directory {
    grid-template-columns: 1fr;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--grammar-workspace-line);
  }

  body[data-page="grammar"].multipage-site [data-grammar-categories] {
    overflow: hidden;
    border-right: 0;
    border-bottom: 1px solid var(--grammar-workspace-line);
  }

  body[data-page="grammar"].multipage-site .grammar-category-nav__heading,
  body[data-page="grammar"].multipage-site .grammar-topic-list__heading {
    min-height: 56px;
  }

  body[data-page="grammar"].multipage-site .grammar-category-nav__items {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 10px 16px 14px;
    scrollbar-width: none;
  }

  body[data-page="grammar"].multipage-site .grammar-category-nav__items::-webkit-scrollbar {
    display: none;
  }

  body[data-page="grammar"].multipage-site .grammar-category-nav__items button {
    min-height: 42px;
    flex: 0 0 auto;
    grid-template-columns: auto auto;
    gap: 8px;
    padding: 0 13px;
    border: 1px solid var(--grammar-workspace-line);
    border-radius: 999px;
  }

  body[data-page="grammar"].multipage-site .grammar-category-nav__items button::before,
  body[data-page="grammar"].multipage-site .grammar-category-nav__items button small {
    display: none;
  }

  body[data-page="grammar"].multipage-site .grammar-category-nav__items button.is-active {
    border-color: #f2c8c0;
  }

  body[data-page="grammar"].multipage-site .grammar-topic-list {
    max-height: 204px;
  }

  body[data-page="grammar"].multipage-site .grammar-product__lesson {
    overflow: visible;
    padding: 28px 22px 0;
  }

  body[data-page="grammar"].multipage-site .grammar-lesson__footer {
    position: static;
    margin: 0 -22px;
    padding-inline: 22px;
  }

  body[data-page="grammar"].multipage-site .grammar-hub__intro,
  body[data-page="grammar"].multipage-site .grammar-hub__modules > header {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  body[data-page="grammar"].multipage-site .grammar-hub__continue,
  body[data-page="grammar"].multipage-site .grammar-hub__hero article.grammar-hub__continue {
    grid-template-columns: 1fr;
  }

  body[data-page="grammar"].multipage-site .grammar-hub__continue blockquote {
    border-top: 1px solid rgba(255, 255, 255, 0.13);
    border-left: 0;
  }
}

@media (max-width: 640px) {
  body[data-page="grammar"].multipage-site .grammar-hub__hero {
    padding-top: 42px;
  }

  body[data-page="grammar"].multipage-site .grammar-hub__intro h1 {
    font-size: clamp(42px, 13vw, 56px);
  }

  body[data-page="grammar"].multipage-site .grammar-hub__continue > div,
  body[data-page="grammar"].multipage-site .grammar-hub__continue blockquote {
    padding: 34px 26px;
  }

  body[data-page="grammar"].multipage-site .grammar-hub__grid {
    grid-template-columns: 1fr;
  }

  body[data-page="grammar"].multipage-site .grammar-hub__card + .grammar-hub__card {
    border-top: 1px solid var(--grammar-workspace-line);
    border-left: 0;
  }

  body[data-page="grammar"].multipage-site .grammar-workspace__heading h1 {
    font-size: 27px;
  }

  body[data-page="grammar"].multipage-site .grammar-workspace__search kbd {
    display: none;
  }

  body[data-page="grammar"].multipage-site .grammar-lesson__head {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  body[data-page="grammar"].multipage-site .grammar-lesson__head h2 {
    font-size: 30px;
  }

  body[data-page="grammar"].multipage-site .grammar-lesson__duration {
    width: max-content;
  }

  body[data-page="grammar"].multipage-site .grammar-model {
    padding: 23px 20px;
  }

  body[data-page="grammar"].multipage-site .grammar-model__actions {
    flex-wrap: wrap;
  }

  body[data-page="grammar"].multipage-site .grammar-explanation-section__heading {
    align-items: flex-start;
    flex-direction: column;
  }

  body[data-page="grammar"].multipage-site .grammar-mistake,
  body[data-page="grammar"].multipage-site .grammar-explanation-grid,
  body[data-page="grammar"].multipage-site .grammar-note-grid,
  body[data-page="grammar"].multipage-site .grammar-example-grid {
    grid-template-columns: 1fr;
  }

  body[data-page="grammar"].multipage-site .grammar-lesson__footer {
    grid-template-columns: 1fr 1fr;
    padding-top: 10px;
    padding-bottom: 10px;
  }

  body[data-page="grammar"].multipage-site .grammar-lesson__footer a {
    grid-column: 1 / -1;
  }

  body[data-page="grammar"].multipage-site .grammar-lesson__footer small {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  body[data-page="grammar"].multipage-site .grammar-workspace__progress > span,
  body[data-page="grammar"].multipage-site .grammar-hub__progress > span > span,
  body[data-page="grammar"].multipage-site .grammar-lesson__more > summary .ph {
    transition-duration: 0.01ms;
  }

  body[data-page="grammar"].multipage-site .grammar-flip-card__inner {
    transition-duration: 0.01ms;
  }
}