.page-shell {
  max-width: var(--topic-shell-width, 1180px);
  margin: 0 auto;
  padding: var(--topic-shell-padding, 44px 24px 72px);
}

.page-shell h1 {
  max-width: 760px;
  margin: 0 0 12px;
  color: #12201a;
  font-size: clamp(2.15rem, 4vw, 3.45rem);
  line-height: 1.08;
  text-wrap: balance;
}

.page-shell .lead {
  max-width: 820px;
  font-size: 1.02rem;
}

.page-shell section {
  background: #fff;
  border-radius: var(--topic-section-radius, 18px);
  padding: var(--topic-section-padding, 22px 24px);
  margin-bottom: 18px;
  box-shadow: var(--topic-section-shadow, 0 16px 32px rgba(27,28,25,0.06));
}

.page-shell p,
.page-shell li {
  line-height: var(--topic-copy-line-height, 1.85);
  color: var(--topic-copy-color, #414942);
}

.page-shell ul,
.page-shell ol {
  margin-left: 18px;
}

.page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 14px 0 24px;
}

.page-nav a {
  text-decoration: none;
}

.example {
  margin: 12px 0;
  padding: 12px 14px;
  background: var(--topic-example-bg, #f8f7f2);
  border-left: 4px solid var(--topic-example-border, #735c00);
  border-radius: 10px;
}

.example strong {
  color: var(--topic-example-strong, #023820);
}

.formula {
  margin: 12px 0;
  padding: 14px 16px;
  background: var(--topic-formula-bg, #0f3c2c);
  color: var(--topic-formula-color, #fff);
  border-radius: 12px;
}

.formula code {
  color: var(--topic-formula-accent, #ffe088);
  font-size: 1rem;
}

.table-wrap {
  overflow-x: auto;
}

.page-shell table,
.page-shell table.lesson-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}

.page-shell th,
.page-shell td,
.page-shell .lesson-table th,
.page-shell .lesson-table td {
  border: 1px solid rgba(0,0,0,0.08);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.page-shell th,
.page-shell .lesson-table th {
  background: #f5f3ee;
  color: var(--topic-table-head-color, inherit);
}

.grammar-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 28px;
  align-items: start;
  margin-bottom: 24px;
}

.grammar-hero-copy {
  min-width: 0;
}

.grammar-mini-board,
.grammar-summary-callout {
  background: linear-gradient(135deg, rgba(239, 247, 241, 0.96), rgba(255, 250, 241, 0.94));
  border: 1px solid rgba(20, 91, 63, 0.14);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 18px 34px rgba(34, 45, 35, 0.07);
}

.grammar-mini-board h2,
.grammar-mini-board h3 {
  margin: 0 0 12px;
  font-size: 1.05rem;
  color: #0f4a34;
}

.grammar-mini-board p {
  margin: 0 0 14px;
}

.grammar-quick-strip {
  display: grid;
  gap: 8px;
}

.grammar-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  align-items: stretch;
}

.grammar-flow-step {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(15, 60, 44, 0.1);
  border-radius: 10px;
  padding: 10px;
  text-align: center;
}

.grammar-flow-step span {
  display: block;
  color: #68746c;
  font-size: 0.82rem;
  margin-bottom: 4px;
}

.grammar-flow-step strong {
  color: #0f5a3c;
}

.grammar-section-number {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-right: 10px;
  border-radius: 9px;
  background: #0f5a3c;
  color: #fff;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.grammar-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

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

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

.grammar-topic-card {
  background: #fbfaf6;
  border: 1px solid rgba(15, 60, 44, 0.1);
  border-radius: 14px;
  padding: 16px;
}

.grammar-topic-card.is-inside {
  background: #f4fbf6;
  border-color: rgba(34, 130, 88, 0.24);
}

.grammar-topic-card.is-surface {
  background: #fff8ef;
  border-color: rgba(218, 126, 38, 0.26);
}

.grammar-topic-card.is-person {
  background: #f8f4ff;
  border-color: rgba(119, 82, 170, 0.24);
}

.grammar-topic-card.is-blue {
  background: #f2f8ff;
  border-color: rgba(44, 122, 189, 0.2);
}

.grammar-topic-card.is-red {
  background: #fff4f2;
  border-color: rgba(180, 74, 52, 0.18);
}

.grammar-topic-card h3 {
  margin: 0 0 8px;
  color: #173126;
}

.grammar-topic-card p {
  margin: 0;
}

.grammar-case-matrix {
  display: grid;
  grid-template-columns: 120px repeat(3, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid rgba(15, 60, 44, 0.14);
  border-radius: 14px;
  background: #fff;
}

.grammar-case-matrix > div {
  padding: 12px 14px;
  border-right: 1px solid rgba(15, 60, 44, 0.1);
  border-bottom: 1px solid rgba(15, 60, 44, 0.1);
}

.grammar-case-matrix > div:nth-child(4n) {
  border-right: 0;
}

.grammar-case-matrix > div:nth-last-child(-n+4) {
  border-bottom: 0;
}

.grammar-case-matrix .matrix-head {
  background: #f5f3ee;
  font-weight: 800;
  color: #173126;
}

.grammar-case-matrix .matrix-row-label {
  font-weight: 800;
  color: #173126;
  background: #faf8f2;
}

.grammar-case-matrix strong {
  display: block;
  color: #0f5a3c;
}

.grammar-case-matrix small {
  display: block;
  color: #667069;
  margin-top: 2px;
}

.grammar-tip {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #f7f2e9;
  border: 1px solid rgba(146, 104, 21, 0.14);
  color: #4b463d;
}

.grammar-wrong-line {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #fff4f2;
  color: #67372f;
}

.grammar-bad-form {
  color: #b23a2e;
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  text-decoration-color: rgba(178, 58, 46, 0.55);
}

.grammar-vowel-showcase {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.grammar-vowel-word {
  min-height: 104px;
  padding: 14px;
  border: 1px solid rgba(15, 90, 60, 0.12);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(247, 242, 233, 0.54));
}

.grammar-vowel-word strong {
  display: block;
  color: #0f5a3c;
  font-size: 1.45rem;
  line-height: 1.1;
}

.grammar-vowel-word span:not(.grammar-vowel-hot) {
  display: block;
  margin-top: 8px;
  color: #5f675f;
  font-size: 0.92rem;
  line-height: 1.55;
}

.grammar-vowel-hot {
  color: #d06b22;
  font-weight: 900;
}

.grammar-harmony-lab {
  margin: 18px 0;
  padding: 16px;
  border-radius: 16px;
  background: #fbfaf6;
  border: 1px solid rgba(15, 90, 60, 0.12);
}

.grammar-harmony-lab h3 {
  margin: 0 0 6px;
  font-size: 1.12rem;
  color: #173126;
}

.grammar-harmony-lab > p {
  margin: 0 0 14px;
  color: #566158;
}

.grammar-harmony-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.grammar-harmony-card {
  display: grid;
  grid-template-columns: minmax(108px, 0.72fr) minmax(0, 1.28fr);
  gap: 10px;
  padding: 12px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid rgba(15, 60, 44, 0.1);
}

.grammar-harmony-source,
.grammar-harmony-pair > div {
  display: grid;
  gap: 5px;
  align-content: start;
}

.grammar-harmony-source span,
.grammar-harmony-pair span {
  color: #68726b;
  font-size: 0.78rem;
  font-weight: 800;
}

.grammar-harmony-source button,
.grammar-harmony-pair button,
.grammar-mouth-words button,
.grammar-audio-dot {
  min-height: 34px;
  border: 1px solid rgba(15, 60, 44, 0.14);
  border-radius: 10px;
  background: #fff;
  color: #0f4a34;
  font-weight: 800;
  cursor: pointer;
}

.grammar-harmony-source button:hover,
.grammar-harmony-pair button:hover,
.grammar-mouth-words button:hover,
.grammar-audio-dot:hover {
  background: #edf5ee;
}

.grammar-harmony-source small,
.grammar-harmony-pair small {
  color: #4f5b53;
  line-height: 1.45;
}

.grammar-harmony-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.grammar-harmony-pair .is-good {
  padding: 8px;
  border-radius: 11px;
  background: #eef8f1;
}

.grammar-harmony-pair .is-good button {
  color: #0f5a3c;
}

.grammar-harmony-pair .is-bad {
  padding: 8px;
  border-radius: 11px;
  background: #fff2ef;
}

.grammar-harmony-pair .is-bad button {
  color: #a83b2e;
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
  text-decoration-color: rgba(168, 59, 46, 0.45);
}

.grammar-summary-callout {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  margin-top: 22px;
}

.grammar-summary-callout strong {
  color: #0f5a3c;
}

.grammar-next-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid rgba(15, 90, 60, 0.32);
  color: #0f4a34;
  text-decoration: none;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.75);
}

.grammar-priority-grid,
.grammar-example-grid,
.grammar-case-cluster {
  display: grid;
  gap: 12px;
}

.grammar-priority-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 16px 0 4px;
}

.grammar-priority-card {
  background: #f8f7f2;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 14px;
  padding: 14px;
}

.grammar-priority-card strong {
  color: #0f3c2c;
}

.grammar-example-grid {
  margin-top: 14px;
}

.grammar-example-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: #f8f7f2;
  border-left: 4px solid #94720b;
  border-radius: 12px;
}

.grammar-example-text {
  min-width: 0;
}

.grammar-hu {
  display: block;
  color: #13291f;
  font-weight: 700;
  line-height: 1.7;
}

.grammar-zh {
  display: block;
  color: #566158;
  font-size: 0.94rem;
  line-height: 1.65;
  margin-top: 2px;
}

.grammar-word {
  appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  display: inline-flex;
  align-items: baseline;
  white-space: nowrap;
  margin-right: 0.16em;
  padding: 0 2px;
  border-radius: 6px;
  transition: background 160ms ease, transform 160ms ease;
}

.grammar-token {
  font-weight: 750;
  margin: 0;
  padding: 0;
}

.grammar-word:hover,
.grammar-word:focus-visible,
.grammar-word.is-speaking {
  background: rgba(15, 60, 44, 0.1);
  outline: none;
  transform: translateY(-1px);
}

.grammar-token--root {
  color: #0f6b43;
}

.grammar-token--case {
  color: #b23a2e;
}

.grammar-token--prefix {
  color: #7a3fb5;
}

.grammar-token--quantity {
  color: #2563a9;
}

.grammar-token--possessive {
  color: #9a6400;
}

.grammar-token--function {
  color: #7a817a;
  font-weight: 650;
}

.grammar-audio-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.grammar-audio-btn {
  width: 34px;
  height: 34px;
  border: 1px solid rgba(15, 60, 44, 0.14);
  border-radius: 10px;
  background: #fff;
  color: #0f3c2c;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 160ms ease, transform 160ms ease, border-color 160ms ease;
}

.grammar-audio-btn:hover,
.grammar-audio-btn:focus-visible {
  background: #edf5ee;
  border-color: rgba(15, 60, 44, 0.28);
  outline: none;
  transform: translateY(-1px);
}

.grammar-audio-btn--slow {
  font-size: 1rem;
}

.grammar-inline-audio {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 6px;
  vertical-align: middle;
}

.grammar-audio-btn--inline {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  font-size: 0.82rem;
}

.grammar-map-table td:first-child,
.grammar-map-table td:nth-child(3) {
  font-weight: 700;
  color: #0f3c2c;
}

.grammar-priority {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 4px 8px;
  background: #edf5ee;
  color: #0f3c2c;
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
}

.grammar-priority--later {
  background: #f7efe2;
  color: #7a4d00;
}

.grammar-priority--advanced {
  background: #eef0f2;
  color: #505a63;
}

.grammar-case-cluster {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 14px;
}

.grammar-case-card {
  background: #f8f7f2;
  border-radius: 14px;
  padding: 14px;
}

.grammar-case-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.grammar-case-card p {
  margin: 0;
}

.grammar-note-list li + li {
  margin-top: 8px;
}

.grammar-practice-block {
  margin-top: 14px;
  padding: 14px 16px;
  background: #f8f7f2;
  border-radius: 14px;
  border: 1px solid rgba(0,0,0,0.06);
}

.grammar-practice-block h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.grammar-practice-block ol {
  margin-top: 0;
  margin-bottom: 0;
}

.grammar-practice-block del {
  color: #9f3a2f;
  text-decoration-thickness: 2px;
}

.vowel-lab .grammar-mini-board--memory {
  border-color: rgba(15, 118, 110, 0.16);
}

.vowel-lab .grammar-hero-grid {
  grid-template-columns: minmax(0, 1fr);
}

.vh-vowel-grid,
.vh-pair-grid,
.vh-set-row {
  display: grid;
  gap: 14px;
}

.vh-vowel-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 16px;
}

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

.vh-vowel-grid article,
.vh-pair-card,
.vh-set-card {
  border: 1px solid rgba(15, 90, 60, 0.12);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(247, 242, 233, 0.48));
  box-shadow: 0 12px 26px rgba(25, 38, 30, 0.045);
}

.vh-vowel-grid article {
  min-height: 150px;
  padding: 16px;
  display: grid;
  align-content: start;
  justify-items: start;
}

.vh-vowel-grid article p,
.vh-pair-card small,
.vh-set-card small {
  color: #5f675f;
  line-height: 1.55;
}

.vh-word-unit {
  display: inline-grid;
  grid-template-columns: auto auto;
  gap: 6px;
  align-items: center;
  max-width: 100%;
}

.vh-word-unit small {
  grid-column: 1 / -1;
}

.vh-word {
  display: inline-flex;
  align-items: baseline;
  min-height: 30px;
  border-radius: 8px;
  color: #0f5a3c;
  font-weight: 850;
  line-height: 1.15;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: rgba(15, 90, 60, 0.16);
  text-underline-offset: 4px;
  transition: color 160ms ease, background 160ms ease, box-shadow 160ms ease, text-decoration-color 160ms ease;
}

.vh-word:hover,
.vh-word:focus-visible,
.vh-word.is-speaking {
  color: #0b6b47;
  background: rgba(15, 118, 110, 0.08);
  box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.06);
  text-decoration-color: rgba(15, 118, 110, 0.46);
  outline: none;
}

.vh-root {
  color: #0f5a3c;
}

.vh-suffix {
  margin-left: -1px;
  padding: 0 3px 1px;
  border-radius: 6px;
  color: #b45309;
  background: rgba(255, 244, 232, 0.9);
  transition: background 160ms ease, color 160ms ease;
}

.vh-word:hover .vh-suffix,
.vh-word:focus-visible .vh-suffix {
  color: #0f5a3c;
  background: #dff3e9;
}

.vh-slow {
  width: 25px;
  height: 25px;
  padding: 0;
  border: 1px solid rgba(15, 90, 60, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  color: #0f5a3c;
  cursor: pointer;
  font-size: 0.78rem;
  line-height: 1;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.vh-slow:hover,
.vh-slow:focus-visible {
  background: #edf8f1;
  border-color: rgba(15, 90, 60, 0.26);
  transform: translateY(-1px);
  outline: none;
}

.vh-pair-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 16px;
}

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

.vh-pair-card {
  padding: 14px;
}

.vh-pair-step {
  min-height: 58px;
}

.vh-arrow {
  width: 28px;
  margin: 8px 0;
  color: #8a958e;
  font-weight: 900;
  text-align: center;
}

.vh-bad-form {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 10px;
  background: #f3f1ee;
  color: #77716a;
}

.vh-bad-word {
  display: inline-flex;
  align-items: baseline;
  font-weight: 800;
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
  cursor: pointer;
  text-underline-offset: 4px;
  transition: color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.vh-bad-word:hover,
.vh-bad-word:focus-visible,
.vh-bad-word.is-speaking {
  color: #5e5851;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 0 0 4px rgba(107, 101, 93, 0.08);
  outline: none;
}

.vh-bad-root {
  color: #74706a;
}

.vh-bad-suffix {
  margin-left: -1px;
  padding: 0 3px 1px;
  border-radius: 6px;
  color: #9a5a1a;
  background: rgba(222, 210, 197, 0.72);
}

.vh-bad-form em {
  padding: 2px 6px;
  border-radius: 999px;
  background: #e8e4dd;
  color: #6b655d;
  font-size: 0.76rem;
  font-style: normal;
  font-weight: 800;
}

.vh-set-card {
  padding: 16px;
  margin-top: 16px;
}

.vh-set-source {
  display: flex;
  justify-content: center;
  padding: 8px 0 14px;
}

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

.vh-set-row article {
  padding: 14px;
  border-radius: 14px;
  background: #fffdf8;
  border: 1px solid rgba(15, 90, 60, 0.1);
}

.vh-set-row article strong {
  display: block;
  margin-bottom: 10px;
  color: #0f5a3c;
}

.vh-influence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.vh-influence-card {
  padding: 16px;
  border: 1px solid rgba(15, 90, 60, 0.12);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(247, 242, 233, 0.48));
  box-shadow: 0 12px 26px rgba(25, 38, 30, 0.045);
}

.vh-influence-card h3 {
  margin: 0 0 8px;
  color: #0f5a3c;
}

.vh-influence-card > p {
  margin-top: 0;
  color: #5f675f;
  line-height: 1.65;
}

.vh-verb-pairs {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.vh-verb-pairs > div {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px;
  border: 1px solid rgba(15, 90, 60, 0.1);
  border-radius: 14px;
  background: #fffdf8;
}

.vh-verb-pairs > div > span {
  color: #7a817a;
  font-weight: 900;
}

.vowel-lab .grammar-example-grid {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.vowel-lab .grammar-example-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.vowel-lab .grammar-example-text {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
}

.vowel-lab .grammar-audio-actions {
  display: inline-flex;
  justify-content: flex-start;
  gap: 6px;
}

.vowel-lab .grammar-audio-btn {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.74);
  font-size: 0.78rem;
}

.vowel-lab .grammar-audio-btn:hover,
.vowel-lab .grammar-audio-btn:focus-visible {
  background: #edf8f1;
}

:root {
  --case-primary: #0f766e;
  --case-primary-dark: #064e3b;
  --case-bg: #f7f4ed;
  --case-card: #fffdf8;
  --case-border: #e8e2d6;
  --case-muted: #6b7280;
  --case-green: #eef8f3;
  --case-orange: #fff4e8;
  --case-blue: #eef6fb;
  --case-purple: #f5f0ff;
  --case-pink: #fff1f2;
  --case-yellow: #fff8e7;
}

:root {
  --case-bg: #f7f3ea;
  --case-card: #fffdf8;
  --case-border: #eee4d6;
  --case-primary: #0f766e;
  --case-primary-dark: #064e3b;
  --case-muted: #6b7280;
  --case-green-soft: #edf8f2;
  --case-orange-soft: #fff3e6;
  --case-blue-soft: #eef7ff;
  --case-purple-soft: #f5f0ff;
  --case-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

.case-soft-ui {
  --topic-shell-width: 1120px;
}

.case-soft-ui h1,
.case-soft-ui h2,
.case-soft-ui h3,
.case-soft-ui p {
  letter-spacing: 0;
}

.case-hero-card,
.case-soft-section {
  background: var(--case-card);
  border: 1px solid var(--case-border);
  border-radius: 22px;
  box-shadow: var(--case-shadow);
}

.case-hero-card {
  display: block;
  padding: 42px 44px 48px;
  margin-bottom: 26px;
  min-height: 300px;
}

.case-hero-card h1 {
  margin: 0 0 14px;
  color: #10241f;
  font-size: clamp(2.25rem, 3.8vw, 3.55rem);
  line-height: 1.04;
  max-width: 820px;
  text-wrap: balance;
}

.case-hero-card .lead {
  max-width: 680px;
  margin: 0;
  color: #24332e;
  font-size: 1.06rem;
  line-height: 1.85;
}

.case-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 30px;
}

.case-pill-row span {
  padding: 9px 16px;
  border-radius: 999px;
  background: #e7f4ee;
  color: var(--case-primary-dark);
  font-weight: 850;
}

.case-concept-note,
.case-soft-note,
.case-final-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--case-border);
  border-radius: 14px;
  background: linear-gradient(180deg, #fffaf2, #fffdf8);
}

.case-concept-note {
  width: min(100%, 660px);
}

.case-concept-note > span[aria-hidden="true"] {
  width: 12px;
  height: 12px;
  flex: 0 0 12px;
  border-radius: 999px;
  background: var(--case-primary);
  box-shadow: 0 0 0 7px rgba(15, 118, 110, 0.08);
}

.case-concept-note p,
.case-soft-note,
.case-final-bar span {
  margin: 0;
  color: #44534c;
  line-height: 1.7;
}

.case-concept-note strong {
  color: #17231d;
}

.case-soft-section {
  padding: 30px;
  margin-top: 24px;
}

.case-soft-heading {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.case-soft-heading > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border-radius: 10px;
  background: var(--case-primary);
  color: #fff;
  font-weight: 900;
}

.case-soft-heading h2,
.case-mindset-copy h2 {
  margin: 0 0 6px;
  color: #17231d;
  font-size: 1.55rem;
  text-wrap: balance;
}

.case-soft-heading p,
.case-mindset-copy p {
  margin: 0;
  color: var(--case-muted);
  line-height: 1.7;
}

.case-space-soft-grid,
.case-common-soft-grid,
.case-group-grid,
.case-mindset-grid {
  display: grid;
  gap: 22px;
}

.case-space-soft-grid,
.case-group-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.case-space-soft,
.case-relation-card,
.case-group-grid article,
.case-mindset-grid article {
  border: 1px solid var(--case-border);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.case-space-soft {
  padding: 20px;
}

.case-space-soft h3,
.case-relation-card h3,
.case-group-grid h3,
.case-mindset-grid h3 {
  margin: 0 0 14px;
  color: var(--case-primary-dark);
  font-size: 1.1rem;
}

.case-space-soft--green { background: linear-gradient(150deg, var(--case-green-soft), #fffdf8 72%); }
.case-space-soft--orange { background: linear-gradient(150deg, var(--case-orange-soft), #fffdf8 72%); }
.case-space-soft--blue { background: linear-gradient(150deg, var(--case-blue-soft), #fffdf8 72%); }

.case-house {
  position: relative;
  width: 132px;
  height: 90px;
  margin: 4px auto 16px;
}

.house-roof {
  position: absolute;
  left: 32px;
  top: 6px;
  width: 58px;
  height: 58px;
  border-left: 6px solid #8b5e3c;
  border-top: 6px solid #8b5e3c;
  transform: rotate(45deg);
  border-radius: 4px 0 0 0;
}

.house-body {
  position: absolute;
  left: 34px;
  top: 33px;
  width: 62px;
  height: 48px;
  border-radius: 5px;
  background: #fff4dc;
  border: 2px solid #dfc7a7;
}

.house-door {
  position: absolute;
  left: 23px;
  bottom: 0;
  width: 17px;
  height: 27px;
  border-radius: 6px 6px 0 0;
  background: #9aa48d;
}

.house-dot {
  position: absolute;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: #24a35a;
  box-shadow: 0 10px 22px rgba(36, 163, 90, 0.25);
}

.case-house--inside .house-dot { left: 53px; top: 50px; }
.case-house--to .house-dot { left: -28px; top: 54px; }
.case-house--from .house-dot { left: 53px; top: 52px; }

.house-arrow {
  position: absolute;
  inset: 16px 0 0;
  width: 132px;
  height: 62px;
  overflow: visible;
}

.case-house--to .house-arrow {
  transform: translate(-30px, -8px);
  transform-origin: 34px 28px;
}

.house-arrow line,
.house-arrow polyline {
  fill: none;
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0;
}

.case-house--to .house-arrow line,
.case-house--to .house-arrow polyline {
  opacity: 1;
  stroke: #f07824;
}

.case-house--from .house-arrow {
  transform: translateX(38px);
}

.case-house--from .house-arrow line,
.case-house--from .house-arrow polyline {
  opacity: 1;
  stroke: #2d8fd5;
}

.case-transform-row,
.case-down,
.case-chain {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.case-transform-row > span,
.case-down > span,
.case-chain > b {
  color: #526159;
  font-weight: 900;
}

.case-meaning-row {
  display: flex;
  justify-content: space-around;
  gap: 16px;
  margin: 6px 0 14px;
  color: var(--case-muted);
  font-size: 0.92rem;
}

.speak-wrap {
  display: inline-grid;
  grid-template-columns: auto auto;
  align-items: center;
  gap: 6px;
}

.speak-word {
  color: #0f2e27;
  cursor: pointer;
  font-size: 1.25rem;
  font-weight: 900;
  line-height: 1.15;
  text-decoration: underline;
  text-decoration-color: rgba(15, 118, 110, 0.12);
  text-underline-offset: 4px;
}

.speak-word:hover,
.speak-word:focus-visible {
  color: var(--case-primary);
  text-decoration-color: rgba(15, 118, 110, 0.42);
}

.case-root {
  color: #0f2e27;
}

.case-suffix-part {
  color: #d66f1f;
}

.case-space-soft--green .case-suffix-part,
.case-chain .still .case-suffix-part {
  color: #12845e;
}

.case-space-soft--blue .case-suffix-part,
.case-chain .from .case-suffix-part {
  color: #1c7fc2;
}

.case-sentence {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
  align-items: center;
  margin-top: 14px;
  padding: 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(15, 23, 42, 0.06);
}

.case-sentence .sentence {
  display: block;
  color: #123029;
}

.case-sentence small,
.case-relation-card small {
  display: block;
  color: var(--case-muted);
  line-height: 1.55;
}

.case-soft-ui .audio-btn,
.case-soft-ui .slow-btn {
  width: 30px;
  height: 30px;
  border: 1px solid rgba(15, 118, 110, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 7px 16px rgba(15, 23, 42, 0.05);
  cursor: pointer;
}

.case-soft-ui .slow-btn {
  font-size: 0.78rem;
}

.case-soft-ui .audio-btn:hover,
.case-soft-ui .slow-btn:hover {
  background: #e9f7f0;
}

.case-relation-card {
  padding: 20px;
}

.case-relation-visual {
  height: 56px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  color: var(--case-primary);
}

.case-line-icon {
  width: 118px;
  height: 54px;
  overflow: visible;
}

.case-line-icon circle,
.case-line-icon path,
.case-line-icon line,
.case-line-icon polyline,
.case-line-icon rect {
  fill: none;
  stroke: currentColor;
  stroke-width: 3.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.case-relation-card.case-purple .case-relation-visual { color: #7b5bbe; }
.case-relation-card.case-orange .case-relation-visual { color: #d77a21; }
.case-relation-card.case-green .case-relation-visual { color: #16825f; }
.case-relation-card.case-blue .case-relation-visual { color: #2877b5; }

.case-give-visual,
.case-with-visual {
  justify-content: flex-start;
}

.case-relation-card.case-purple { background: linear-gradient(145deg, rgba(245, 240, 255, 0.78), #fffdf8 78%); }
.case-relation-card.case-orange { background: linear-gradient(145deg, rgba(255, 243, 230, 0.84), #fffdf8 78%); }
.case-relation-card.case-green { background: linear-gradient(145deg, rgba(237, 248, 242, 0.9), #fffdf8 78%); }
.case-relation-card.case-blue { background: linear-gradient(145deg, rgba(238, 247, 255, 0.9), #fffdf8 78%); }

.case-down {
  flex-direction: column;
  margin: 14px 0;
}

.case-group-grid h3 {
  position: relative;
  padding-left: 18px;
}

.case-group-grid h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--case-primary);
  box-shadow: 0 0 0 6px rgba(15, 118, 110, 0.07);
}

.case-group-grid article {
  padding: 20px;
  background: linear-gradient(145deg, #fffdf8, #fbf7ef);
}

.case-chain .speak-word {
  font-size: 1.08rem;
}

.case-chain-item {
  display: grid;
  justify-items: center;
  gap: 7px;
  min-width: 82px;
}

.case-chain-item small {
  color: #34443d;
  font-size: 0.86rem;
  line-height: 1.35;
  text-align: center;
}

.case-soft-note strong {
  color: var(--case-primary-dark);
  white-space: nowrap;
}

.case-soft-note span {
  color: #44534c;
  line-height: 1.7;
}

.case-space-insight {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.95fr);
  gap: 24px;
  align-items: center;
  margin-top: 22px;
  padding: 18px 20px;
  border: 1px solid rgba(15, 118, 110, 0.12);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(237, 248, 242, 0.78), rgba(255, 253, 248, 0.88));
}

.case-space-insight strong {
  color: #17231d;
  line-height: 1.65;
}

.case-space-insight strong span {
  color: var(--case-primary-dark);
}

.case-space-insight p {
  margin: 8px 0 0;
  color: #44534c;
  line-height: 1.7;
}

.case-chinese-bridge {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-left: 22px;
  border-left: 1px solid rgba(15, 118, 110, 0.15);
}

.case-chinese-bridge span {
  padding: 7px 13px;
  border-radius: 10px;
  background: #e6f4ee;
  color: var(--case-primary-dark);
  font-weight: 850;
}

.case-chinese-bridge small {
  flex-basis: 100%;
  color: #44534c;
  font-weight: 700;
}

.case-mindset-section {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 18px;
}

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

.case-mindset-grid article {
  padding: 18px;
  text-align: center;
}

.case-mindset-grid article span {
  display: inline-flex;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  border-radius: 12px;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.16), rgba(15, 118, 110, 0.03));
  box-shadow: inset 0 0 0 1px rgba(15, 118, 110, 0.12);
}

.case-final-bar {
  grid-column: 1 / -1;
  justify-content: space-between;
  background: linear-gradient(90deg, var(--case-green-soft), #fffdf8);
}

.case-final-bar a {
  flex: 0 0 auto;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--case-primary);
  color: #fff;
  text-decoration: none;
  font-weight: 900;
}

.case-relation-map-section {
  display: block;
}

.case-relation-map {
  overflow: hidden;
  border: 1px solid var(--case-border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.64);
}

.case-relation-row {
  display: grid;
  grid-template-columns: minmax(130px, 0.9fr) minmax(120px, 0.75fr) minmax(240px, 1.35fr) minmax(140px, 1fr);
  gap: 16px;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(232, 226, 214, 0.86);
}

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

.case-relation-head {
  background: linear-gradient(180deg, #f6f1e8, #fbf7ef);
  color: #46544e;
  font-weight: 850;
}

.case-relation-row > span:first-child {
  color: #26362f;
  font-weight: 750;
}

.case-relation-row > strong {
  color: var(--case-primary-dark);
}

.case-relation-row > span:nth-child(3) {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
}

.case-relation-row .sentence {
  color: #123029;
  font-weight: 850;
}

.case-relation-row small {
  color: #5d6a63;
  line-height: 1.5;
}

.case-soft-ui .case-map-table,
.case-soft-ui .case-table-wrap,
.case-soft-ui .case-section,
.case-soft-ui .case-hero,
.case-soft-ui .case-overview-card,
.case-soft-ui .case-space-grid,
.case-soft-ui .case-common-grid,
.case-soft-ui .case-key-grid,
.case-soft-ui .case-summary {
  all: revert;
}

.case-overview {
  --topic-shell-width: 1120px;
  color: #17231d;
}

.case-overview h1,
.case-overview h2,
.case-overview h3,
.case-overview p {
  letter-spacing: 0;
}

.case-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 380px);
  gap: 28px;
  align-items: start;
  margin-bottom: 22px;
}

.case-hero h1 {
  margin: 0 0 12px;
  color: #17231d;
  font-size: clamp(2rem, 3.2vw, 3rem);
  line-height: 1.08;
}

.case-hero .lead {
  max-width: 680px;
  margin: 0 0 8px;
  color: #1f2a24;
  font-size: 1.05rem;
  line-height: 1.8;
}

.case-hero-copy > p:not(.lead) {
  margin: 0;
  color: #53615a;
  line-height: 1.75;
}

.case-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 18px;
}

.case-tabs a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--case-border);
  color: #31443b;
  text-decoration: none;
  font-weight: 800;
  box-shadow: 0 8px 18px rgba(25, 38, 30, 0.04);
}

.case-tabs a:hover,
.case-tabs a:focus-visible {
  color: #fff;
  background: var(--case-primary);
  outline: none;
}

.case-note,
.case-soft-note,
.case-summary {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 253, 248, 0.88);
  border: 1px solid var(--case-border);
  box-shadow: 0 12px 28px rgba(25, 38, 30, 0.05);
}

.case-note p,
.case-soft-note {
  margin: 0;
  color: #49574f;
  line-height: 1.75;
}

.case-overview-card {
  padding: 18px;
  border-radius: 18px;
  background: linear-gradient(180deg, #fffdf8 0%, #fbf7ef 100%);
  border: 1px solid var(--case-border);
  box-shadow: 0 18px 40px rgba(25, 38, 30, 0.08);
}

.case-overview-card h2 {
  margin: 0 0 14px;
  color: var(--case-primary-dark);
  font-size: 1rem;
}

.case-overview-card p {
  margin: 14px 0 0;
  color: #58665e;
  font-size: 0.92rem;
  line-height: 1.65;
}

.case-mini-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--case-border);
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
}

.case-mini-grid div {
  min-height: 118px;
  padding: 12px;
  border-right: 1px solid var(--case-border);
  border-bottom: 1px solid var(--case-border);
}

.case-mini-grid div:nth-child(2n) {
  border-right: 0;
}

.case-mini-grid div:nth-last-child(-n+2) {
  border-bottom: 0;
}

.case-mini-grid strong,
.case-mini-grid span {
  display: block;
}

.case-mini-grid strong {
  margin-bottom: 8px;
  color: var(--case-primary);
}

.case-mini-grid span {
  color: #375149;
  font-weight: 750;
  font-size: 0.9rem;
  line-height: 1.55;
}

.case-section {
  margin-top: 20px;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 253, 248, 0.9);
  border: 1px solid var(--case-border);
  box-shadow: 0 14px 34px rgba(25, 38, 30, 0.055);
}

.case-section-heading {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.case-section-heading h2 {
  margin: 0 0 6px;
  color: #17231d;
  font-size: 1.45rem;
}

.case-section-heading p {
  margin: 0;
  color: #627067;
  line-height: 1.7;
}

.case-section-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  border-radius: 8px;
  background: var(--case-primary);
  color: #fff;
  font-weight: 900;
}

.case-space-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.case-space-card,
.case-small-card,
.case-key-grid article {
  border: 1px solid var(--case-border);
  border-radius: 16px;
  background: var(--case-card);
  box-shadow: 0 12px 26px rgba(25, 38, 30, 0.045);
}

.case-space-card {
  padding: 18px;
}

.case-space-card--green { background: linear-gradient(180deg, var(--case-green), #fffdf8); }
.case-space-card--orange { background: linear-gradient(180deg, var(--case-orange), #fffdf8); }
.case-space-card--blue { background: linear-gradient(180deg, var(--case-blue), #fffdf8); }

.case-space-card h3,
.case-small-card h3,
.case-key-grid h3 {
  margin: 0 0 6px;
  color: var(--case-primary-dark);
  font-size: 1.08rem;
}

.case-card-subtitle,
.case-space-card p,
.case-small-card p,
.case-key-grid p {
  color: #526159;
  line-height: 1.65;
}

.case-suffix,
.case-small-card > strong {
  display: block;
  margin: 12px 0 8px;
  color: var(--case-primary);
  font-size: 1.05rem;
}

.case-illustration {
  position: relative;
  width: 120px;
  height: 92px;
  margin: 4px auto 16px;
}

.case-illustration::before {
  content: "";
  position: absolute;
  inset: 10px 18px 8px;
  border-radius: 8px;
  border: 2px solid rgba(126, 126, 110, 0.22);
  background: linear-gradient(135deg, rgba(170, 168, 145, 0.12), rgba(255,255,255,0.75));
  box-shadow: 12px 12px 26px rgba(80, 80, 70, 0.1);
}

.case-illustration span {
  position: absolute;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #39a467;
  box-shadow: 0 10px 22px rgba(57, 164, 103, 0.28);
}

.case-illustration--inside span { left: 45px; top: 42px; }
.case-illustration--to span { left: 22px; top: 46px; }
.case-illustration--from span { left: 42px; top: 48px; }

.case-illustration--to::after,
.case-illustration--from::after {
  content: "";
  position: absolute;
  width: 52px;
  height: 7px;
  border-radius: 999px;
  top: 57px;
}

.case-illustration--to::after {
  left: 47px;
  background: linear-gradient(90deg, #f2a154, #f07730);
}

.case-illustration--from::after {
  left: 66px;
  background: linear-gradient(90deg, #62aee0, #2f83c7);
}

.case-example {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 6px;
  align-items: center;
  margin-top: 10px;
}

.case-example span,
.case-map-table td:nth-child(4) > span {
  color: var(--case-primary-dark);
  font-weight: 850;
}

.case-example small,
.case-map-table small {
  grid-column: 1 / -1;
  color: var(--case-muted);
  line-height: 1.5;
}

.audio-btn,
.slow-btn {
  width: 28px;
  height: 28px;
  border: 1px solid rgba(15, 118, 110, 0.16);
  border-radius: 9px;
  background: #fff;
  color: var(--case-primary-dark);
  cursor: pointer;
}

.case-common-grid,
.case-key-grid {
  display: grid;
  gap: 14px;
}

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

.case-small-card,
.case-key-grid article {
  padding: 16px;
}

.case-tint-purple { background: linear-gradient(180deg, var(--case-purple), #fffdf8); }
.case-tint-yellow { background: linear-gradient(180deg, var(--case-yellow), #fffdf8); }
.case-tint-blue { background: linear-gradient(180deg, var(--case-blue), #fffdf8); }
.case-tint-pink { background: linear-gradient(180deg, var(--case-pink), #fffdf8); }
.case-tint-green { background: linear-gradient(180deg, var(--case-green), #fffdf8); }

.case-table-wrap {
  margin-top: 8px;
}

.case-map-table {
  background: #fff;
}

.case-map-table th {
  color: #26332d;
  background: #f4efe6;
}

.case-map-table td {
  vertical-align: top;
  line-height: 1.55;
}

.case-map-table td:first-child,
.case-map-table td:nth-child(3) {
  color: var(--case-primary);
  font-weight: 850;
}

.case-map-table .audio-btn,
.case-map-table .slow-btn {
  margin-left: 4px;
  vertical-align: middle;
}

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

.case-summary {
  justify-content: space-between;
  margin-top: 16px;
  background: linear-gradient(90deg, var(--case-green), #fffdf8);
}

.case-summary span {
  color: #375149;
  line-height: 1.65;
}

.case-summary a {
  flex: 0 0 auto;
  padding: 10px 14px;
  border-radius: 10px;
  color: #fff;
  background: var(--case-primary);
  text-decoration: none;
  font-weight: 850;
}

@media (max-width: 760px) {
  .page-shell {
    padding: 28px 14px 56px;
  }

  .grammar-hero-grid,
  .grammar-priority-grid,
  .grammar-case-cluster,
  .grammar-card-grid,
  .grammar-card-grid--two,
  .grammar-card-grid--four,
  .grammar-vowel-showcase,
  .grammar-summary-callout {
    grid-template-columns: 1fr;
  }

  .grammar-mini-board {
    padding: 16px;
  }

  .grammar-flow,
  .grammar-case-matrix {
    min-width: 620px;
  }

  .grammar-flow-wrap,
  .grammar-matrix-wrap {
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .grammar-harmony-card,
  .grammar-harmony-pair {
    grid-template-columns: 1fr;
  }

  .grammar-example-line {
    grid-template-columns: 1fr;
  }

  .grammar-audio-actions {
    justify-content: flex-start;
  }

  .vh-vowel-grid,
  .vh-pair-grid,
  .vh-set-row,
  .vh-influence-grid,
  .vh-vowel-grid--two,
  .vh-pair-grid--compact {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
  .case-hero,
  .case-space-grid,
  .case-common-grid,
  .case-key-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .case-hero-copy {
    grid-column: 1 / -1;
  }

  .case-hero-card,
  .case-space-soft-grid,
  .case-common-soft-grid,
  .case-group-grid,
  .case-mindset-section,
  .case-mindset-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .case-hero-card .case-hero-copy,
  .case-final-bar {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .case-hero,
  .case-space-grid,
  .case-common-grid,
  .case-key-grid,
  .case-mini-grid {
    grid-template-columns: 1fr;
  }

  .case-mini-grid div,
  .case-mini-grid div:nth-child(2n),
  .case-mini-grid div:nth-last-child(-n+2) {
    border-right: 0;
    border-bottom: 1px solid var(--case-border);
  }

  .case-mini-grid div:last-child {
    border-bottom: 0;
  }

  .case-section {
    padding: 14px;
  }

  .case-example {
    grid-template-columns: 1fr auto auto;
  }

  .case-summary {
    align-items: stretch;
    flex-direction: column;
  }

  .case-summary a {
    text-align: center;
  }

  .case-hero-card,
  .case-space-soft-grid,
  .case-common-soft-grid,
  .case-group-grid,
  .case-space-insight,
  .case-mindset-section,
  .case-mindset-grid {
    grid-template-columns: 1fr;
  }

  .case-chinese-bridge {
    padding-left: 0;
    border-left: 0;
    padding-top: 14px;
    border-top: 1px solid rgba(15, 118, 110, 0.14);
  }

  .case-relation-map {
    overflow-x: auto;
  }

  .case-relation-row {
    grid-template-columns: minmax(120px, 0.85fr) minmax(112px, 0.75fr) minmax(220px, 1.35fr) minmax(130px, 1fr);
    min-width: 720px;
  }

  .case-hero-card,
  .case-soft-section {
    padding: 16px;
    border-radius: 18px;
  }

  .case-final-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .case-final-bar a {
    text-align: center;
  }
}