.chinese-shell {
  position: relative;
  z-index: 1;
  width: min(1240px, calc(100% - 24px));
  margin: 0 auto;
  padding: 34px 0 44px;
  color: #17202a;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans SC", sans-serif;
}

.study-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.study-topbar .source-note {
  min-width: 0;
  max-width: 100%;
}

.home-link,
.source-note a,
.footer-link {
  color: #0f766e;
  font-weight: 800;
  text-decoration: none;
}

.home-link:hover,
.source-note a:hover,
.footer-link:hover {
  color: #0a4f4a;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.study-header,
.level-nav,
.study-panel,
.study-footer {
  border: 1px solid rgba(219, 229, 224, 0.95);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 42px rgba(24, 33, 43, 0.1);
  backdrop-filter: blur(14px);
}

.study-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 24px;
  align-items: center;
  padding: 28px;
  margin-bottom: 14px;
  overflow: hidden;
}

.study-kicker {
  margin: 0 0 6px;
  color: #a34717;
  font-size: 0.86rem;
  font-weight: 900;
  text-transform: uppercase;
}

.study-title {
  margin: 0;
  color: #141c25;
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.1;
}

.study-subtitle {
  max-width: 72ch;
  margin: 10px 0 0;
  color: #46525d;
  font-size: 1rem;
  line-height: 1.55;
}

.study-plan {
  max-width: 72ch;
  margin: 12px 0 0;
  padding-left: 14px;
  border-left: 4px solid #d6452f;
  color: #30404d;
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1.5;
}

.session-button {
  margin-top: 16px;
}

.hanzi-visual {
  display: grid;
  grid-template-columns: repeat(2, 58px);
  gap: 8px;
  padding: 10px;
  border: 1px solid #eadbc6;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(180, 35, 24, 0.1), rgba(15, 118, 110, 0.12)),
    #fffaf0;
}

.hanzi-visual span {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border: 1px solid rgba(180, 35, 24, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.8);
  color: #b42318;
  font-family: "Noto Sans SC", serif;
  font-size: 2.2rem;
  font-weight: 900;
}

.study-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(88px, 1fr));
  gap: 8px;
  min-width: 300px;
}

.stat-tile {
  min-height: 82px;
  padding: 12px;
  border: 1px solid #dbe5e0;
  border-radius: 8px;
  background: #f8faf9;
}

.stat-label {
  display: block;
  color: #65737f;
  font-size: 0.78rem;
  font-weight: 800;
}

.stat-value {
  display: block;
  margin-top: 2px;
  color: #16212b;
  font-size: 1.3rem;
  font-weight: 900;
}

.level-nav {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  padding: 10px;
  margin-bottom: 16px;
}

.level-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: #16212b;
  font-weight: 900;
  text-decoration: none;
}

.level-link small {
  margin-top: 2px;
  color: #65737f;
  font-size: 0.72rem;
  font-weight: 800;
}

.level-link:hover,
.level-link.is-active {
  color: #0f766e;
  border-color: rgba(15, 118, 110, 0.25);
  background: #d8f0ec;
}

.study-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(340px, 0.8fr);
  gap: 16px;
  align-items: start;
}

.study-panel {
  padding: 22px;
  min-width: 0;
}

.panel-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.panel-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.session-progress {
  color: #80633c;
  font-size: 0.84rem;
  font-weight: 900;
}

.panel-title {
  margin: 0;
  color: #141c25;
  font-size: 1.15rem;
  font-weight: 900;
}

.panel-note,
.source-note {
  margin: 0;
  color: #65737f;
  font-size: 0.92rem;
  line-height: 1.5;
}

.flashcard {
  display: grid;
  align-content: center;
  min-height: 340px;
  padding: 26px;
  border: 1px solid #dbe5e0;
  border-radius: 8px;
  background: linear-gradient(180deg, #fffaf0 0%, #ffffff 74%);
}

.card-face-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: #80633c;
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.card-hanzi {
  display: block;
  color: #b42318;
  font-size: 4.2rem;
  font-weight: 900;
  line-height: 1.1;
  text-align: center;
}

.card-prompt {
  max-width: 38ch;
  min-height: 48px;
  margin: 18px auto 0;
  color: #6c291c;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.5;
  text-align: center;
}

.card-reveal {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  max-width: 560px;
  width: 100%;
  margin: 18px auto 0;
  padding: 16px;
  border: 1px solid #dfc78e;
  border-radius: 8px;
  background: #fff8e8;
}

.meaning-seal {
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  padding: 8px;
  border: 2px solid #c89533;
  border-radius: 50%;
  background: #9d211b;
  box-shadow: inset 0 0 0 5px #f9e6ae;
  color: #fff5db;
  text-align: center;
}

.seal-glyph {
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
}

.seal-type {
  margin-top: 3px;
  font-size: 0.66rem;
  font-weight: 900;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.card-translation {
  min-width: 0;
}

.card-reveal .card-pinyin {
  min-height: 0;
  margin: 0;
  font-size: 1.15rem;
  text-align: left;
}

.card-reveal .card-meaning {
  min-height: 0;
  margin: 6px 0 0;
  font-size: 1.28rem;
  text-align: left;
}

.card-pinyin {
  display: block;
  min-height: 34px;
  margin-top: 10px;
  color: #8a4f10;
  font-size: 1.35rem;
  font-weight: 800;
  text-align: center;
}

.card-meaning {
  min-height: 64px;
  margin: 16px auto 0;
  color: #26323d;
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
}

.card-example {
  min-height: 0;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid #eadbc6;
  color: #47545f;
  line-height: 1.55;
  text-align: center;
}

.example-zh {
  display: block;
  color: #17202a;
  font-size: 1.15rem;
  font-weight: 800;
}

.example-pinyin,
.example-en {
  display: block;
  margin-top: 2px;
}

.tool-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tool-row.compact {
  margin-top: 0;
}

.tool-button,
.choice-button,
.small-button {
  min-height: 44px;
  border: 1px solid #cfdcd6;
  border-radius: 8px;
  background: #ffffff;
  color: #17202a;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease,
    color 160ms ease;
}

.tool-button {
  padding: 9px 14px;
}

.small-button {
  min-height: 44px;
  padding: 6px 10px;
  font-size: 0.88rem;
}

.tool-button:focus-visible,
.choice-button:focus-visible,
.small-button:focus-visible,
.search-input:focus-visible,
.select-input:focus-visible,
.prompt-list textarea:focus-visible,
.level-link:focus-visible,
.flashcard:focus-visible {
  outline: 3px solid #e6bc59;
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
  transform: none;
}

.tool-button:hover,
.choice-button:hover,
.small-button:hover {
  border-color: rgba(15, 118, 110, 0.45);
  background: #effaf7;
  color: #0f766e;
  transform: translateY(-1px);
}

.tool-button.primary {
  border-color: #0f766e;
  background: #0f766e;
  color: #ffffff;
}

.tool-button.warn {
  border-color: #d8b15d;
  background: #fff6dc;
  color: #7a4709;
}

.known-state {
  margin-top: 10px;
  color: #65737f;
  font-size: 0.9rem;
  font-weight: 800;
}

.vocab-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(158px, auto) minmax(158px, auto);
  gap: 10px;
  margin-bottom: 12px;
}

.search-input,
.select-input {
  width: 100%;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid #cfdcd6;
  border-radius: 8px;
  background: #ffffff;
  color: #17202a;
  font: inherit;
}

.vocab-list {
  display: grid;
  gap: 8px;
  max-height: 620px;
  padding-right: 4px;
  overflow: auto;
}

.vocab-pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 14px;
}

.page-status {
  color: #80633c;
  font-size: 0.9rem;
  font-weight: 800;
  text-align: center;
}

.vocab-row {
  display: grid;
  grid-template-columns: minmax(72px, 0.42fr) minmax(110px, 0.58fr) minmax(150px, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 12px;
  border: 1px solid #dbe5e0;
  border-radius: 8px;
  background: #ffffff;
}

.vocab-row.is-known {
  border-color: rgba(15, 118, 110, 0.35);
  background: #f1faf7;
}

.vocab-hanzi {
  color: #b42318;
  font-size: 1.55rem;
  font-weight: 900;
}

.vocab-pinyin {
  color: #8a4f10;
  font-weight: 800;
}

.vocab-meaning {
  color: #26323d;
  font-weight: 700;
}

.quiz-card {
  padding: 18px;
  border: 1px solid #dbe5e0;
  border-radius: 8px;
  background: #ffffff;
}

.quiz-prompt {
  margin: 0 0 12px;
  color: #65737f;
  font-weight: 800;
}

.quiz-word {
  display: block;
  margin-bottom: 4px;
  color: #b42318;
  font-size: 2.7rem;
  font-weight: 900;
  line-height: 1.15;
}

.quiz-pinyin {
  display: block;
  min-height: 26px;
  color: #8a4f10;
  font-weight: 900;
}

.choice-grid {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.choice-button {
  width: 100%;
  padding: 10px 12px;
  text-align: left;
  overflow-wrap: anywhere;
}

.choice-button.is-correct {
  border-color: #0f766e;
  background: #d8f0ec;
  color: #075c55;
}

.choice-button.is-wrong {
  border-color: #b42318;
  background: #fff0ec;
  color: #921b13;
}

.feedback {
  min-height: 34px;
  margin: 12px 0 0;
  color: #46525d;
  font-weight: 800;
}

.grammar-list {
  display: grid;
  gap: 12px;
}

.grammar-item {
  padding: 16px;
  border: 1px solid #dbe5e0;
  border-radius: 8px;
  background: #ffffff;
}

.grammar-item h3 {
  margin: 0 0 8px;
  color: #17202a;
  font-size: 1rem;
  font-weight: 900;
}

.pattern {
  display: inline-block;
  margin-bottom: 8px;
  padding: 4px 8px;
  border-radius: 8px;
  background: #fff6dc;
  color: #7a4709;
  font-weight: 900;
}

.grammar-item p {
  margin: 6px 0;
  color: #46525d;
}

.comprehension-card,
.test-item {
  padding: 16px;
  border: 1px solid #dbe5e0;
  border-radius: 8px;
  background: #ffffff;
}

.comprehension-card h3,
.test-item h3 {
  margin: 0 0 8px;
  color: #17202a;
  font-size: 1rem;
  font-weight: 900;
}

.reading-text {
  margin: 12px 0;
  padding: 16px;
  border-left: 4px solid #0f766e;
  border-radius: 8px;
  background: #f1faf7;
  color: #17202a;
  font-family: "Noto Sans SC", ui-sans-serif, system-ui, sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.75;
}

.prompt-list {
  display: grid;
  gap: 10px;
}

.prompt-list label {
  display: grid;
  gap: 6px;
  color: #46525d;
  font-weight: 800;
}

.prompt-list textarea {
  width: 100%;
  min-height: 76px;
  resize: vertical;
  padding: 10px;
  border: 1px solid #cfdcd6;
  border-radius: 8px;
  color: #17202a;
  font: inherit;
}

.dialogue-lines {
  display: grid;
  gap: 8px;
  margin: 12px 0 14px;
}

.dialogue-lines p {
  margin: 0;
  padding: 10px 12px;
  border: 1px solid #eadbc6;
  border-radius: 8px;
  background: #fffaf0;
  color: #17202a;
  font-family: "Noto Sans SC", ui-sans-serif, system-ui, sans-serif;
  font-weight: 800;
}

.level-test-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.test-item p {
  margin: 8px 0;
  color: #17202a;
  font-weight: 800;
}

.podcast-card ol {
  display: grid;
  gap: 8px;
  margin: 12px 0 0;
  padding-left: 22px;
}

.podcast-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.audio-mark {
  display: flex;
  align-items: center;
  gap: 3px;
  flex: 0 0 auto;
  height: 40px;
  padding: 8px;
  border: 1px solid #d5a54a;
  border-radius: 8px;
  background: #fff5dc;
}

.audio-mark span {
  width: 4px;
  border-radius: 4px;
  background: #9d211b;
}

.audio-mark span:nth-child(1),
.audio-mark span:nth-child(5) { height: 11px; }
.audio-mark span:nth-child(2),
.audio-mark span:nth-child(4) { height: 20px; }
.audio-mark span:nth-child(3) { height: 28px; }

.podcast-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(140px, 0.45fr);
  gap: 10px;
  margin-top: 16px;
}

.podcast-controls label {
  display: grid;
  gap: 5px;
  color: #80633c;
  font-size: 0.8rem;
  font-weight: 900;
}

.podcast-controls .select-input {
  min-width: 0;
}

.audio-status {
  min-height: 24px;
  margin: 12px 0 0;
  color: #80633c;
  font-size: 0.9rem;
  font-weight: 800;
}

.podcast-card li {
  color: #30404d;
  font-family: "Noto Sans SC", ui-sans-serif, system-ui, sans-serif;
  font-weight: 800;
  line-height: 1.55;
}

.grammar-exercise {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #e3ebe7;
}

.grammar-choices {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.empty-state {
  padding: 18px;
  border: 1px dashed #cfdcd6;
  border-radius: 8px;
  color: #65737f;
  font-weight: 800;
  text-align: center;
}

.study-footer {
  margin-top: 16px;
  padding: 16px 20px;
}

.source-note {
  margin: 0;
}

/* Forbidden City-inspired course theme. */
body {
  background-color: #6d1713;
  background-image: linear-gradient(rgba(82, 13, 10, 0.3), rgba(82, 13, 10, 0.54)), url("./assets/forbidden-city-study-bg.png");
  background-position: center top;
  background-size: cover;
}

body::before {
  background: rgba(68, 12, 9, 0.18);
}

.chinese-shell {
  color: #33230f;
}

.home-link,
.source-note a,
.footer-link {
  color: #9d211b;
}

.home-link:hover,
.source-note a:hover,
.footer-link:hover {
  color: #6b1512;
}

.study-header,
.level-nav,
.study-panel,
.study-footer {
  border-color: rgba(210, 166, 71, 0.88);
  background: rgba(255, 248, 231, 0.94);
  box-shadow: 0 16px 42px rgba(51, 13, 9, 0.28);
}

.study-header {
  border-top: 4px solid #d8a442;
  background: rgba(255, 247, 225, 0.96);
}

.study-kicker {
  color: #a1211b;
}

.study-title,
.panel-title,
.grammar-item h3,
.comprehension-card h3,
.test-item h3 {
  color: #751814;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
}

.study-subtitle,
.feedback,
.grammar-item p,
.prompt-list label {
  color: #5e4528;
}

.study-plan {
  border-left-color: #cf9732;
  color: #6c291c;
}

.hanzi-visual {
  border-color: #c99433;
  background: #821c17;
}

.hanzi-visual span {
  border-color: rgba(224, 180, 80, 0.8);
  background: #fff4d9;
  color: #9b211c;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
}

.stat-tile {
  border-color: #ddc182;
  background: #fff8e8;
}

.stat-label,
.panel-note,
.source-note,
.known-state,
.quiz-prompt,
.example-pinyin,
.example-en {
  color: #80633c;
}

.stat-value {
  color: #8e1e18;
}

.level-nav {
  border-color: #c99537;
  background: rgba(111, 22, 18, 0.95);
}

.level-link {
  color: #fff0c7;
}

.level-link small {
  color: #edc776;
}

.level-link:hover,
.level-link.is-active {
  color: #731713;
  border-color: #e4bd5c;
  background: #f2ca72;
}

.level-link:hover small,
.level-link.is-active small {
  color: #7c2118;
}

.flashcard,
.quiz-card,
.vocab-row,
.grammar-item,
.comprehension-card,
.test-item {
  border-color: #dfc78e;
  background: rgba(255, 252, 240, 0.96);
}

.flashcard {
  border-top: 3px solid #c89533;
  background: rgba(255, 249, 229, 0.98);
}

.card-hanzi,
.quiz-word,
.vocab-hanzi {
  color: #a3211b;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
}

.card-pinyin,
.quiz-pinyin,
.vocab-pinyin {
  color: #9a6615;
}

.card-meaning,
.vocab-meaning,
.example-zh,
.test-item p,
.dialogue-lines p {
  color: #422f19;
}

.card-example,
.grammar-exercise {
  border-color: #e3cf9e;
}

.tool-button,
.choice-button,
.small-button,
.search-input,
.select-input,
.prompt-list textarea {
  border-color: #d7b86c;
  background: #fffaf0;
  color: #552c1d;
}

.tool-button:hover,
.choice-button:hover,
.small-button:hover {
  border-color: #a6231d;
  background: #fde7ad;
  color: #7b1915;
}

.tool-button.primary {
  border-color: #efc361;
  background: #9d211b;
  color: #fff4d9;
}

.tool-button.primary:hover {
  border-color: #f5d27d;
  background: #7e1714;
  color: #fff8e6;
}

.tool-button.warn {
  border-color: #538778;
  background: #e4f0e7;
  color: #1f5d51;
}

.vocab-row.is-known {
  border-color: #6b9d8c;
  background: #edf5ed;
}

.choice-button.is-correct {
  border-color: #37776a;
  background: #dcece4;
  color: #1e5f52;
}

.choice-button.is-wrong {
  border-color: #a32620;
  background: #fae3d6;
  color: #861c18;
}

.pattern {
  border: 1px solid #dfbd65;
  background: #f9e9b5;
  color: #7f4d10;
}

.reading-text {
  border-left-color: #a3221c;
  background: #edf3e7;
  color: #3c3821;
}

.dialogue-lines p {
  border-color: #dfc17b;
  background: #fff5dc;
}

.podcast-card li {
  color: #5b3a20;
}

.empty-state {
  border-color: #c99537;
  color: #80633c;
}

.study-footer {
  border-color: #d5a54a;
  background: rgba(104, 20, 16, 0.96);
}

.study-footer .source-note,
.study-footer .source-note a {
  color: #f7d98f;
}

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

@media (max-width: 980px) {
  .study-header,
  .study-grid {
    grid-template-columns: 1fr;
  }

  .study-stats {
    min-width: 0;
  }

  .hanzi-visual {
    width: max-content;
  }
}

@media (max-width: 680px) {
  .chinese-shell {
    width: min(1240px, calc(100% - 16px));
    padding-top: 18px;
  }

  .study-topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .study-header,
  .study-panel {
    padding: 16px;
  }

  .panel-title-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .panel-actions {
    width: 100%;
    justify-content: space-between;
  }

  .panel-title-row .small-button {
    align-self: flex-start;
  }

  .study-title {
    font-size: 1.8rem;
  }

  .study-stats,
  .level-test-grid,
  .vocab-controls,
  .vocab-row {
    grid-template-columns: 1fr;
  }

  .level-nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 8px;
    scroll-snap-type: x proximity;
  }

  .level-link {
    flex: 0 0 96px;
    min-height: 56px;
    scroll-snap-align: start;
  }

  .session-button {
    width: 100%;
  }

  .vocab-pager {
    align-items: stretch;
    flex-direction: column;
  }

  .vocab-pager .small-button {
    width: 100%;
  }

  .card-hanzi {
    font-size: 3.25rem;
  }

  .flashcard {
    min-height: 320px;
    padding: 20px 16px;
  }

  .card-reveal {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 12px;
    padding: 12px;
  }

  .meaning-seal {
    width: 72px;
    height: 72px;
  }

  .seal-glyph {
    font-size: 1.65rem;
  }

  .card-reveal .card-meaning {
    font-size: 1.08rem;
  }

  .podcast-heading {
    gap: 10px;
  }

  .podcast-controls {
    grid-template-columns: 1fr;
  }

  .vocab-list {
    max-height: none;
  }

  body {
    background-attachment: scroll;
  }
}