:root {
  --ink: #13251f;
  --muted: #65746c;
  --paper: #f8f2e7;
  --paper-strong: #fffaf0;
  --green: #123026;
  --moss: #2f5f49;
  --jade: #78b892;
  --gold: #d7a84e;
  --coral: #d9624b;
  --blue: #2f6c9f;
  --line: rgba(19, 37, 31, 0.16);
  --shadow: 0 20px 64px rgba(24, 42, 33, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(215, 168, 78, 0.16) 0 22%, transparent 22% 100%),
    linear-gradient(210deg, rgba(47, 108, 159, 0.14) 0 18%, transparent 18% 100%),
    linear-gradient(180deg, #fbf6ec 0%, #f0e7d8 52%, #e8ede2 100%);
  font-family:
    ui-serif,
    "Songti SC",
    "Noto Serif CJK SC",
    Georgia,
    serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  opacity: 0.13;
  background-image:
    linear-gradient(90deg, rgba(0, 0, 0, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(0, 0, 0, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  mix-blend-mode: multiply;
}

.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1rem clamp(1rem, 4vw, 4rem);
  background: rgba(248, 242, 231, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand,
nav {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.8rem;
  text-decoration: none;
  font-weight: 850;
}

.brand-mark {
  display: grid;
  width: 2.8rem;
  height: 2.8rem;
  place-items: center;
  color: var(--paper-strong);
  background: var(--green);
  border-radius: 50%;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 900;
}

.brand-text {
  font-size: 1rem;
}

nav {
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.2rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
}

nav a {
  padding: 0.5rem 0.65rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.94rem;
  text-decoration: none;
}

nav a:hover {
  color: var(--green);
  background: rgba(18, 48, 38, 0.08);
}

main,
footer {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.72fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  min-height: calc(100svh - 5.4rem);
  padding: clamp(3rem, 8vw, 7rem) 0 2rem;
}

.eyebrow,
.section-kicker,
.panel-label,
.level {
  margin: 0 0 0.75rem;
  color: var(--coral);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 1.25rem;
  font-size: 7rem;
  line-height: 0.96;
  letter-spacing: 0;
}

h1 span {
  display: block;
}

h2 {
  margin-bottom: 1rem;
  font-size: 3.25rem;
  line-height: 1.04;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.22rem;
  line-height: 1.2;
}

.lede,
.section-heading p,
.path-card p,
.lesson-list p,
.textbook-grid p,
.culture-copy p,
.culture-cards p,
.quiz-panel small,
.sources li {
  color: var(--muted);
}

.lede {
  max-width: 46rem;
  margin-bottom: 2rem;
  font-size: 1.22rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  font: 780 0.96rem ui-sans-serif, system-ui, sans-serif;
  cursor: pointer;
}

.button {
  border: 1px solid var(--green);
  text-decoration: none;
}

.button.primary,
button {
  color: var(--paper-strong);
  background: var(--green);
  border: 1px solid var(--green);
}

.button.secondary {
  background: rgba(255, 250, 240, 0.62);
}

.course-poster {
  position: relative;
  overflow: hidden;
  min-height: 560px;
  border: 1px solid rgba(19, 37, 31, 0.2);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(220, 233, 227, 0.95), rgba(231, 214, 178, 0.92) 45%, rgba(84, 121, 105, 0.96) 46%, #173127 100%);
  box-shadow: var(--shadow);
}

.home-hero {
  grid-template-columns: minmax(0, 0.98fr) minmax(340px, 0.82fr);
}

.home-hero h1 {
  max-width: 45rem;
  font-size: 6.4rem;
}

.meme-poster {
  position: relative;
  overflow: hidden;
  min-height: 560px;
  border: 1px solid rgba(19, 37, 31, 0.2);
  border-radius: 8px;
  background:
    radial-gradient(circle at 18% 18%, rgba(217, 98, 75, 0.18), transparent 28%),
    linear-gradient(180deg, rgba(255, 250, 240, 0.96), rgba(244, 233, 212, 0.95));
  box-shadow: var(--shadow);
}

.meme-poster::after {
  content: "";
  position: absolute;
  inset: auto -10% -18% -10%;
  height: 42%;
  background: var(--green);
  transform: rotate(-3deg);
}

.meme-number {
  position: absolute;
  inset: 25% 1.4rem auto;
  z-index: 1;
  display: grid;
  gap: 0.25rem;
  color: var(--green);
}

.meme-number strong {
  font: 950 10rem/0.9 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0;
}

.meme-number span {
  color: var(--coral);
  font: 850 1.12rem ui-sans-serif, system-ui, sans-serif;
}

.meme-note {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.meme-note span {
  min-height: 4.2rem;
  display: grid;
  place-items: center;
  padding: 0.6rem;
  color: var(--paper-strong);
  background: rgba(18, 48, 38, 0.82);
  border: 1px solid rgba(255, 250, 240, 0.18);
  border-radius: 8px;
  font: 850 0.94rem ui-sans-serif, system-ui, sans-serif;
  text-align: center;
}

.poster-top {
  position: absolute;
  inset: 1.1rem 1.1rem auto;
  display: flex;
  justify-content: space-between;
  color: var(--green);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 900;
}

.poster-top strong {
  font-size: 3.6rem;
  line-height: 1;
}

.tone-board {
  position: absolute;
  top: 23%;
  right: 9%;
  display: grid;
  width: 11rem;
  height: 11rem;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  overflow: hidden;
  color: var(--green);
  background: rgba(18, 48, 38, 0.18);
  border-radius: 50%;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 900;
}

.tone-board span {
  display: grid;
  place-items: center;
  background: rgba(255, 250, 240, 0.84);
}

.lake-lines {
  position: absolute;
  inset: 52% 0 0;
}

.lake-lines i {
  position: absolute;
  left: 8%;
  right: 8%;
  height: 1px;
  background: rgba(255, 250, 240, 0.34);
}

.lake-lines i:nth-child(1) {
  top: 22%;
}

.lake-lines i:nth-child(2) {
  top: 40%;
  left: 18%;
}

.lake-lines i:nth-child(3) {
  top: 58%;
  right: 16%;
}

.lake-lines i:nth-child(4) {
  top: 76%;
  left: 12%;
}

.poster-note {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  color: var(--paper-strong);
  background: rgba(18, 48, 38, 0.78);
  border: 1px solid rgba(255, 250, 240, 0.18);
  border-radius: 8px;
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.host-strip {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 1rem 0 5rem;
  padding: 0.85rem 1rem;
  color: var(--green);
  background: rgba(255, 250, 240, 0.72);
  border: 1px solid var(--line);
  border-radius: 8px;
  font: 650 1rem ui-sans-serif, system-ui, sans-serif;
}

.live-dot {
  width: 0.65rem;
  height: 0.65rem;
  background: var(--jade);
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(120, 184, 146, 0.22);
}

.section {
  padding: clamp(3.5rem, 8vw, 7rem) 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  margin-bottom: 2rem;
}

.section-heading .section-kicker {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.section-heading p {
  margin-bottom: 0;
  font-size: 1.06rem;
}

.section-heading.compact {
  display: block;
}

.stats-row,
.path-grid,
.meme-grid,
.festival-board,
.usage-grid,
.lesson-packs,
.workbook-grid,
.tone-grid,
.practice-grid,
.answer-key,
.glossary-grid,
.checkpoint-grid,
.textbook-grid,
.culture-cards {
  display: grid;
  gap: 1rem;
}

.stats-row {
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 1rem;
}

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

.meme-card {
  min-height: 17rem;
  padding: 1.2rem;
}

.meme-card p,
.festival-copy p,
.festival-board p,
.usage-card li,
.usage-card p {
  color: var(--muted);
}

.festival-section {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
}

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

.festival-board article {
  min-height: 15rem;
  padding: 1.1rem;
}

.festival-board strong {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--green);
  font: 900 2.25rem/1 ui-sans-serif, system-ui, sans-serif;
}

.festival-board span {
  display: block;
  margin-bottom: 1.2rem;
  color: var(--coral);
  font: 850 0.88rem ui-sans-serif, system-ui, sans-serif;
}

.usage-card {
  min-height: 20rem;
  padding: 1.2rem;
}

.usage-card ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
}

.usage-card li + li {
  margin-top: 0.9rem;
}

.usage-card.is-good {
  background: rgba(235, 249, 239, 0.7);
}

.usage-card.is-risky {
  background: rgba(255, 241, 232, 0.74);
}

.stats-row article,
.meme-card,
.festival-board article,
.usage-card,
.path-card,
.lesson-list article,
.lesson-packs article,
.workbook-card,
.tone-grid article,
.quiz-panel,
.answer-key article,
.term-card,
.checkpoint-card,
.textbook-grid article,
.culture-cards article {
  background: rgba(255, 250, 240, 0.68);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 16px 44px rgba(24, 42, 33, 0.08);
}

.stats-row article {
  min-height: 8rem;
  padding: 1.1rem;
}

.stats-row strong {
  display: block;
  color: var(--green);
  font: 900 3rem/1 ui-sans-serif, system-ui, sans-serif;
}

.stats-row span,
.path-card li,
.lesson-list small,
.textbook-grid small,
.phrase-row span,
.quiz-panel li,
.culture-cards span {
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.path-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.session-table,
.tone-inventory,
.textbook-catalog {
  overflow: hidden;
  margin: 1rem 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 250, 240, 0.62);
}

.session-row,
.tone-row,
.textbook-row {
  display: grid;
  gap: 1px;
  border-top: 1px solid var(--line);
}

.session-row {
  grid-template-columns: 0.38fr 0.95fr 1.1fr 1.2fr 1.15fr;
}

.tone-row {
  grid-template-columns: 0.75fr 0.9fr 0.9fr 1.6fr;
}

.textbook-row {
  grid-template-columns: 1.15fr 1.05fr 0.72fr 1.55fr;
}

.session-row:first-child,
.tone-row:first-child,
.textbook-row:first-child {
  border-top: 0;
}

.session-row span,
.tone-row span,
.textbook-row span {
  min-height: 3rem;
  padding: 0.74rem 0.85rem;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.92rem;
}

.session-row span:nth-child(1),
.tone-row span:nth-child(1),
.textbook-row span:nth-child(1) {
  color: var(--ink);
  font-weight: 850;
}

.session-row.head,
.tone-row.head,
.textbook-row.head {
  background: var(--green);
}

.session-row.head span,
.tone-row.head span,
.textbook-row.head span {
  color: var(--paper-strong);
  font-weight: 850;
}

.textbook-row a {
  color: var(--blue);
  font-weight: 800;
}

.path-card {
  min-height: 23rem;
  padding: 1.15rem;
}

.level {
  display: inline-flex;
}

.path-card ul {
  margin: 1.2rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.lesson-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.lesson-list article {
  display: grid;
  min-height: 17.5rem;
  grid-template-rows: auto auto 1fr auto;
  padding: 1.1rem;
}

.lesson-list span {
  color: var(--gold);
  font: 900 1rem ui-sans-serif, system-ui, sans-serif;
}

.lesson-list small,
.textbook-grid small {
  color: var(--moss);
  font-weight: 750;
}

.lesson-link {
  align-self: end;
  width: fit-content;
  margin-top: 0.8rem;
  color: var(--green);
  font: 850 0.9rem ui-sans-serif, system-ui, sans-serif;
  text-decoration: none;
  border-bottom: 1px solid rgba(18, 48, 38, 0.35);
}

.lesson-link:hover {
  color: var(--blue);
  border-bottom-color: currentColor;
}

.lesson-packs {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 1rem;
}

.lesson-packs article {
  min-height: 19rem;
  padding: 1.1rem;
}

.lesson-packs p {
  color: var(--muted);
}

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

.workbook-card {
  display: grid;
  gap: 0.85rem;
  min-height: 24rem;
  padding: 1.2rem;
}

.module-tag {
  color: var(--gold);
  font: 900 0.9rem ui-sans-serif, system-ui, sans-serif;
  text-transform: uppercase;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.chip-list span {
  padding: 0.26rem 0.55rem;
  color: var(--green);
  background: rgba(120, 184, 146, 0.16);
  border: 1px solid rgba(47, 95, 73, 0.18);
  border-radius: 999px;
  font: 760 0.86rem ui-sans-serif, system-ui, sans-serif;
}

.workbook-card dl {
  display: grid;
  gap: 0.42rem;
  margin: 0;
}

.workbook-card dt {
  color: var(--coral);
  font: 850 0.78rem ui-sans-serif, system-ui, sans-serif;
  text-transform: uppercase;
}

.workbook-card dd {
  margin: 0 0 0.45rem;
  color: var(--muted);
}

.tone-grid {
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 1rem;
}

.tone-grid article {
  min-height: 11rem;
  padding: 1rem;
}

.tone-grid strong {
  display: block;
  color: var(--green);
  font: 900 2.5rem/1 ui-sans-serif, system-ui, sans-serif;
}

.tone-grid span {
  display: block;
  margin: 0.4rem 0;
  font-weight: 800;
}

.phrase-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 250, 240, 0.62);
}

.phrase-row {
  display: grid;
  grid-template-columns: 1.05fr 0.86fr 0.75fr 1.35fr;
  gap: 1px;
  border-top: 1px solid var(--line);
}

.phrase-row:first-child {
  border-top: 0;
}

.phrase-row span {
  min-height: 3.25rem;
  padding: 0.82rem 0.9rem;
  color: var(--muted);
}

.phrase-row span:first-child {
  color: var(--ink);
  font-weight: 850;
}

.phrase-row.head {
  color: var(--paper-strong);
  background: var(--green);
}

.phrase-row.head span {
  color: var(--paper-strong);
  font-weight: 850;
}

.practice-grid {
  grid-template-columns: 1.1fr 0.95fr 0.95fr;
}

.home-practice .practice-grid {
  grid-template-columns: 1fr;
}

.quiz-panel.home-quiz-card {
  min-height: 42rem;
  padding: clamp(2rem, 5vw, 3.2rem);
}

.home-quiz-card .panel-label {
  font-size: 1rem;
}

.home-quiz-card .prompt {
  max-width: 13em;
  margin-bottom: 5.4rem;
  color: var(--green);
  font-size: 6rem;
  line-height: 1.08;
}

.home-quiz-card button {
  min-width: 10.4rem;
  min-height: 4.45rem;
  padding-inline: 1.75rem;
  font-size: 1.22rem;
}

.home-quiz-card .answer {
  margin: 1.6rem 0 0;
  color: var(--coral);
  font-size: 2.25rem;
}

.home-quiz-card .reading {
  max-width: 44rem;
  margin: 0.45rem 0 0;
  color: var(--moss);
  font: 780 1.08rem/1.45 ui-sans-serif, system-ui, sans-serif;
}

.tone-card ol {
  padding-top: 0.8rem;
}

.answer-key {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1rem;
}

.quiz-panel {
  min-height: 20rem;
  padding: 1.25rem;
}

.quiz-panel p {
  font-size: 2.3rem;
  font-weight: 850;
  line-height: 1.12;
}

.quiz-panel .reading {
  color: var(--moss);
  font: 760 0.98rem/1.45 ui-sans-serif, system-ui, sans-serif;
}

.quiz-panel button + p,
.quiz-panel p + button,
.quiz-panel button + button {
  margin-top: 0.7rem;
}

.answer {
  color: var(--coral);
}

.quiz-panel ol {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

.quiz-panel li + li {
  margin-top: 0.75rem;
}

.answer-key article {
  min-height: 18rem;
  padding: 1.15rem;
}

.answer-key ol,
.rubric-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.answer-key li + li,
.rubric-list li + li {
  margin-top: 0.72rem;
}

.answer-key strong {
  display: block;
  color: var(--ink);
}

.rubric-list {
  padding-left: 0;
  list-style: none;
}

.rubric-list li {
  display: grid;
  grid-template-columns: 3.4rem 1fr;
  gap: 0.7rem;
  align-items: start;
}

.rubric-list strong {
  display: block;
  color: var(--coral);
}

.glossary-tools {
  display: grid;
  gap: 0.9rem;
  margin-bottom: 1rem;
  padding: 1rem;
  background: rgba(255, 250, 240, 0.58);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.search-box {
  display: grid;
  gap: 0.4rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 760;
}

.search-box span,
.glossary-count {
  color: var(--muted);
  font-size: 0.92rem;
}

.search-box input {
  width: 100%;
  min-height: 3rem;
  padding: 0.75rem 0.9rem;
  color: var(--ink);
  background: rgba(255, 250, 240, 0.92);
  border: 1px solid var(--line);
  border-radius: 8px;
  font: 680 1rem ui-sans-serif, system-ui, sans-serif;
}

.filter-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.filter-button {
  min-height: 2.35rem;
  padding: 0.45rem 0.72rem;
  color: var(--green);
  background: rgba(255, 250, 240, 0.74);
  border: 1px solid rgba(47, 95, 73, 0.22);
  font-size: 0.86rem;
}

.filter-button.active {
  color: var(--paper-strong);
  background: var(--green);
}

.glossary-count {
  margin: 0;
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.glossary-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.term-card {
  min-height: 14.5rem;
  padding: 1rem;
}

.term-category,
.term-pronunciation,
.term-meaning,
.term-example,
.checkpoint-card li,
.checkpoint-card p {
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.term-category {
  display: inline-flex;
  margin-bottom: 0.8rem;
  color: var(--coral);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.term-pronunciation {
  margin-bottom: 0.45rem;
  color: var(--gold);
  font-weight: 850;
}

.term-meaning,
.term-example,
.checkpoint-card li,
.checkpoint-card p {
  color: var(--muted);
}

.term-example {
  margin-bottom: 0;
}

.checkpoint-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.checkpoint-card {
  min-height: 25rem;
  padding: 1.1rem;
}

.checkpoint-card ol {
  margin: 1rem 0;
  padding-left: 1.2rem;
}

.checkpoint-card li + li {
  margin-top: 0.72rem;
}

.checkpoint-card p {
  margin-bottom: 0;
}

.checkpoint-card strong {
  color: var(--ink);
}

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

.textbook-grid article {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 18rem;
  padding: 1.1rem;
}

.textbook-grid small {
  align-self: end;
}

.textbook-grid a {
  color: var(--blue);
  font-weight: 750;
}

.culture-section {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
}

.culture-cards {
  grid-template-columns: repeat(3, 1fr);
}

.culture-cards article {
  min-height: 13rem;
  padding: 1.1rem;
}

.culture-cards span {
  display: inline-flex;
  margin-bottom: 2rem;
  color: var(--coral);
  font-weight: 850;
}

.sources {
  max-width: 820px;
}

.sources ul {
  margin: 1rem 0 0;
  padding-left: 1.3rem;
}

.sources li + li {
  margin-top: 0.55rem;
}

.breadcrumb {
  margin-bottom: 1.2rem;
  color: var(--muted);
  font: 760 0.94rem ui-sans-serif, system-ui, sans-serif;
}

.breadcrumb a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(18, 48, 38, 0.3);
}

.chapter-hero {
  padding: clamp(3rem, 7vw, 6rem) 0 2rem;
}

.chapter-hero h1 {
  max-width: 66rem;
  margin-bottom: 1.1rem;
  font-size: clamp(3.4rem, 6.8vw, 6.2rem);
  line-height: 1.02;
}

.chapter-hero h1 span:first-child {
  color: var(--coral);
  font: 900 0.22em/1 ui-sans-serif, system-ui, sans-serif;
}

.chapter-meta,
.chapter-pager,
.chapter-vocab,
.chapter-patterns,
.chapter-task-grid {
  display: grid;
  gap: 1rem;
}

.chapter-meta {
  grid-template-columns: repeat(4, minmax(0, max-content));
  margin-top: 1.6rem;
}

.chapter-meta span {
  padding: 0.48rem 0.72rem;
  color: var(--green);
  background: rgba(255, 250, 240, 0.72);
  border: 1px solid var(--line);
  border-radius: 999px;
  font: 800 0.88rem ui-sans-serif, system-ui, sans-serif;
}

.chapter-pager {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1rem 0 3rem;
}

.chapter-pager a,
.chapter-side article,
.chapter-copy,
.chapter-reading,
.chapter-vocab article,
.chapter-patterns article,
.chapter-task-grid article {
  background: rgba(255, 250, 240, 0.68);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 16px 44px rgba(24, 42, 33, 0.08);
}

.chapter-pager a {
  display: grid;
  gap: 0.25rem;
  min-height: 5.2rem;
  padding: 1rem;
  text-decoration: none;
}

.chapter-pager span {
  color: var(--coral);
  font: 850 0.78rem ui-sans-serif, system-ui, sans-serif;
  text-transform: uppercase;
}

.chapter-pager strong {
  color: var(--green);
  font: 850 1.05rem/1.35 ui-sans-serif, system-ui, sans-serif;
}

.chapter-section {
  padding-block: clamp(2.8rem, 6vw, 5rem);
}

.chapter-layout {
  display: grid;
  grid-template-columns: minmax(240px, 0.35fr) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.chapter-side,
.chapter-main {
  display: grid;
  gap: 1rem;
}

.chapter-side article,
.chapter-copy,
.chapter-reading,
.chapter-vocab article,
.chapter-patterns article,
.chapter-task-grid article {
  padding: 1.15rem;
}

.chapter-side h2,
.chapter-copy h2,
.chapter-reading h2,
.chapter-task-grid h2 {
  font-size: 2rem;
}

.chapter-side ul,
.chapter-copy ul,
.chapter-patterns ul,
.chapter-task-grid ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.chapter-side li + li,
.chapter-copy li + li,
.chapter-patterns li + li,
.chapter-task-grid li + li {
  margin-top: 0.7rem;
}

.chapter-copy p,
.chapter-reading p,
.chapter-vocab p,
.chapter-vocab small,
.chapter-patterns p,
.chapter-side p {
  color: var(--muted);
}

.chapter-copy p,
.chapter-reading p {
  font-size: 1.12rem;
}

.chapter-reading p {
  padding-left: 1rem;
  border-left: 3px solid rgba(217, 98, 75, 0.35);
}

.source-facts {
  background: rgba(245, 247, 236, 0.82);
}

.source-links {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.source-links li {
  padding-top: 0.75rem;
  border-top: 1px solid rgba(19, 37, 31, 0.12);
}

.source-links a {
  color: var(--green);
  font: 850 0.95rem/1.35 ui-sans-serif, system-ui, sans-serif;
  text-decoration: none;
}

.source-links span {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font: 650 0.86rem/1.45 ui-sans-serif, system-ui, sans-serif;
}

.chapter-vocab {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.chapter-vocab article {
  min-height: 13.5rem;
}

.chapter-vocab span {
  display: inline-flex;
  margin-bottom: 0.6rem;
  color: var(--gold);
  font: 850 0.84rem ui-sans-serif, system-ui, sans-serif;
}

.chapter-vocab small {
  display: block;
  margin-top: 0.75rem;
  font: 760 0.92rem/1.45 ui-sans-serif, system-ui, sans-serif;
}

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

.chapter-patterns article {
  min-height: 16rem;
}

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

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem 0 3rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-family: ui-sans-serif, system-ui, sans-serif;
}

@media (max-width: 1080px) {
  .path-grid,
  .meme-grid,
  .usage-grid,
  .festival-board,
  .lesson-list,
  .lesson-packs,
  .answer-key,
  .glossary-grid,
  .checkpoint-grid,
  .chapter-vocab,
  .chapter-patterns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .textbook-grid,
  .culture-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 880px) {
  .site-header,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
  }

  .hero,
  .section-heading,
  .festival-section,
  .culture-section,
  .practice-grid,
  .home-practice .practice-grid,
  .answer-key,
  .glossary-grid,
  .checkpoint-grid,
  .chapter-layout,
  .chapter-task-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .course-poster {
    min-height: 420px;
  }

  .meme-poster {
    min-height: 420px;
  }

  .stats-row,
  .tone-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  h1 {
    font-size: 4.3rem;
  }

  .home-hero h1 {
    font-size: 4.3rem;
  }

  h2 {
    font-size: 2.35rem;
  }

  .lede {
    font-size: 1.1rem;
  }

  .phrase-row {
    grid-template-columns: 1fr;
  }

  .session-row,
  .tone-row,
  .textbook-row {
    grid-template-columns: 1fr;
  }

  .phrase-row span,
  .session-row span,
  .tone-row span,
  .textbook-row span {
    min-height: auto;
    border-top: 1px solid rgba(19, 37, 31, 0.08);
  }

  .phrase-row span:first-child,
  .session-row span:first-child,
  .tone-row span:first-child,
  .textbook-row span:first-child {
    border-top: 0;
  }

  .poster-note {
    flex-direction: column;
  }

  .chapter-meta {
    grid-template-columns: repeat(2, minmax(0, max-content));
  }
}

@media (max-width: 560px) {
  main,
  footer {
    width: min(100% - 1.25rem, 1180px);
  }

  .brand-text {
    font-size: 0.95rem;
  }

  nav {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  nav a {
    padding-inline: 0.35rem;
    text-align: center;
  }

  .path-grid,
  .meme-grid,
  .usage-grid,
  .festival-board,
  .lesson-list,
  .lesson-packs,
  .workbook-grid,
  .stats-row,
  .tone-grid,
  .answer-key,
  .glossary-grid,
  .checkpoint-grid,
  .textbook-grid,
  .culture-cards,
  .chapter-vocab,
  .chapter-patterns,
  .chapter-pager {
    grid-template-columns: 1fr;
  }

  .lesson-list article {
    min-height: 15rem;
  }

  h1 {
    font-size: 3.55rem;
  }

  .home-hero h1 {
    font-size: 3.55rem;
  }

  .quiz-panel p {
    font-size: 1.85rem;
  }

  .quiz-panel.home-quiz-card {
    min-height: 29rem;
  }

  .home-quiz-card .prompt {
    margin-bottom: 2.4rem;
    font-size: 3.1rem;
  }

  .home-quiz-card .reading {
    font-size: 0.92rem;
  }

  .meme-number strong {
    font-size: 7.2rem;
  }

  .meme-note {
    grid-template-columns: 1fr;
  }

  .chapter-meta {
    grid-template-columns: 1fr;
  }
}