.description-hero {
  background:
    linear-gradient(90deg, rgba(42, 91, 96, 0.045) 1px, transparent 1px) 0 0 / 30px 30px,
    linear-gradient(rgba(42, 91, 96, 0.045) 1px, transparent 1px) 0 0 / 30px 30px,
    var(--color-surface-soft);
}

.description-formula {
  display: flex;
  max-width: 820px;
  align-items: center;
  gap: 0.45rem;
  margin: 1rem 0;
  flex-wrap: wrap;
}

.description-formula span {
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-primary-dark);
  font-size: 0.8rem;
  font-weight: 740;
}

.description-formula i {
  color: var(--color-accent);
  font-style: normal;
  font-weight: 820;
}

.description-axis-layout {
  display: grid;
  grid-template-columns: minmax(250px, 0.46fr) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.axis-list {
  display: grid;
  gap: 0.45rem;
}

.axis-button {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: center;
  padding: 0.7rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink);
  font-weight: 730;
  text-align: left;
}

.axis-button span {
  display: grid;
  width: 1.8rem;
  height: 1.8rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-surface-soft);
  color: var(--color-primary);
  font-size: 0.72rem;
}

.axis-button:hover,
.axis-button.is-current {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.axis-button.is-visited span {
  background: var(--color-primary);
  color: #fff;
}

.axis-detail {
  min-height: 430px;
  padding: 1.2rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.axis-detail__heading {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.85rem;
}

.axis-detail__heading p,
.axis-detail__heading h3 {
  margin-bottom: 0;
}

.axis-detail__number {
  display: grid;
  flex: 0 0 auto;
  width: 2.8rem;
  height: 2.8rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 820;
}

.axis-detail__question {
  color: var(--color-primary-dark);
  font-size: 1.03rem;
  font-weight: 670;
}

.axis-example-list {
  display: flex;
  gap: 0.4rem;
  margin: 0.55rem 0 1rem;
  flex-wrap: wrap;
}

.axis-example-list span {
  padding: 0.36rem 0.52rem;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-size: 0.78rem;
  font-weight: 680;
}

.axis-visited,
.distribution-visited {
  margin: 0.65rem 0 0;
  color: var(--color-ink-soft);
  font-size: 0.84rem;
}

.distribution-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
}

.distribution-tab {
  min-height: 3.6rem;
  padding: 0.7rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
  font-weight: 760;
}

.distribution-tab:hover,
.distribution-tab[aria-selected="true"] {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.distribution-tab.is-visited::after {
  margin-left: 0.35rem;
  color: var(--color-primary);
  content: "✓";
}

.distribution-workspace {
  display: grid;
  grid-template-columns: minmax(300px, 0.8fr) minmax(0, 1.2fr);
  gap: 1rem;
  margin-top: 0.75rem;
}

.distribution-map {
  position: relative;
  min-height: 360px;
  overflow: hidden;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at center, rgba(56, 103, 105, 0.04) 0 44%, transparent 45%),
    #f1f4f3;
}

.distribution-map::before {
  position: absolute;
  inset: 14% 12%;
  border: 2px solid rgba(67, 108, 108, 0.3);
  border-radius: 48% 42% 46% 50%;
  content: "";
}

.distribution-map .placeholder-label {
  position: absolute;
  z-index: 5;
  top: 0.65rem;
  left: 0.65rem;
}

.distribution-spot {
  position: absolute;
  z-index: 2;
  width: var(--spot-size);
  height: var(--spot-size);
  border: 2px solid rgba(136, 71, 55, 0.62);
  border-radius: 50%;
  background: rgba(179, 93, 72, 0.28);
  transform: translate(-50%, -50%);
}

.distribution-detail {
  min-height: 360px;
  padding: 1.2rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.distribution-detail h3 {
  margin-bottom: 0.2rem;
}

.distribution-detail__english {
  color: var(--color-ink-soft);
  font-size: 0.82rem;
  font-weight: 680;
}

.distribution-comparisons {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.distribution-comparisons article {
  padding: 0.9rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-soft);
}

.comparison-lines {
  display: grid;
  gap: 0.45rem;
}

.comparison-lines p {
  margin-bottom: 0;
  padding: 0.55rem;
  border-left: 3px solid var(--color-primary);
  background: #fff;
  font-size: 0.85rem;
}

.grading-boundary {
  margin-bottom: 1rem;
}

.grading-layout {
  display: grid;
  grid-template-columns: minmax(230px, 0.42fr) minmax(0, 1fr);
  gap: 1rem;
}

.grading-list {
  display: grid;
  gap: 0.42rem;
}

.grading-button {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: center;
  padding: 0.68rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink);
  text-align: left;
}

.grading-button span {
  display: grid;
  width: 1.8rem;
  height: 1.8rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-surface-soft);
  color: var(--color-primary);
  font-size: 0.72rem;
  font-weight: 820;
}

.grading-button strong {
  display: block;
}

.grading-button small {
  color: var(--color-ink-soft);
}

.grading-button:hover,
.grading-button[aria-current="step"] {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.grading-button.is-visited span {
  background: var(--color-primary);
  color: #fff;
}

.grading-stage {
  min-height: 340px;
  padding: 1.2rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.grading-meter {
  display: grid;
  height: 72px;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.35rem;
  align-items: end;
  margin: 1rem 0;
}

.grading-meter span {
  height: var(--meter-height);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: rgba(56, 109, 109, 0.18);
}

.grading-meter span.is-active {
  background: var(--color-primary);
}

.grading-controls {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  margin-top: 1rem;
}

.severity-contrast-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1rem;
}

.severity-contrast-grid article {
  padding: 0.8rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-soft);
}

.severity-contrast-grid h3 {
  font-size: 0.92rem;
}

.severity-contrast-grid p {
  color: var(--color-ink-soft);
  font-size: 0.8rem;
}

.severity-contrast-grid p:last-child {
  margin-bottom: 0;
}

.severity-contrast-grid .unit {
  color: var(--color-primary-dark);
  font-weight: 720;
}

.description-builder {
  display: grid;
  grid-template-columns: minmax(280px, 0.7fr) minmax(0, 1.3fr);
  gap: 1rem;
}

.builder-form {
  display: grid;
  gap: 0.75rem;
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.builder-form .field {
  display: grid;
  gap: 0.32rem;
}

.builder-form .field > span {
  color: var(--color-ink-soft);
  font-size: 0.8rem;
  font-weight: 720;
}

.builder-form select {
  width: 100%;
  min-width: 0;
  padding: 0.68rem;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-ink);
}

.builder-output {
  min-height: 390px;
  padding: 1.15rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-soft);
}

.builder-output__block {
  margin-top: 0.75rem;
  padding: 0.85rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: #fff;
}

.builder-output__block h3 {
  margin-bottom: 0.35rem;
  font-size: 0.92rem;
}

.builder-output__diagnosis {
  color: var(--color-primary-dark);
  font-size: 1.05rem;
  font-weight: 740;
}

.builder-complete-status {
  color: var(--color-primary-dark);
  font-size: 0.86rem;
  font-weight: 700;
}

.description-case {
  padding: 1.15rem;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface-soft);
}

.quiz-question__instruction {
  margin: 0.25rem 0 0.7rem;
  color: var(--color-ink-soft);
  font-size: 0.8rem;
}

.quiz-options {
  display: grid;
  gap: 0.45rem;
}

.quiz-option {
  display: grid;
  grid-template-columns: 1.2rem minmax(0, 1fr);
  gap: 0.55rem;
  align-items: start;
  padding: 0.65rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-soft);
  cursor: pointer;
}

.quiz-option:hover {
  border-color: var(--color-primary);
}

.quiz-option input {
  margin-top: 0.32rem;
}

.quiz-feedback--correct,
.quiz-feedback--review {
  display: block;
}

.quiz-feedback--correct {
  border-color: #88b79a;
}

.quiz-feedback--review {
  border-color: #d8aa9e;
}

.interpretation-summary {
  margin-top: 1rem;
  padding: 1.1rem 1.2rem;
  border-left: 5px solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
}

.completion-panel {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.completion-message {
  margin-top: 0.8rem;
  color: var(--color-primary-dark);
  font-weight: 720;
}

@media (max-width: 960px) {
  .severity-contrast-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .description-axis-layout,
  .distribution-workspace,
  .grading-layout,
  .description-builder {
    grid-template-columns: 1fr;
  }

  .axis-detail,
  .grading-stage,
  .builder-output {
    min-height: 0;
  }

  .distribution-tabs,
  .distribution-comparisons {
    grid-template-columns: 1fr;
  }

  .distribution-map {
    min-height: 310px;
  }
}

@media (max-width: 480px) {
  .severity-contrast-grid {
    grid-template-columns: 1fr;
  }

  .description-formula {
    display: grid;
    grid-template-columns: 1fr;
  }

  .description-formula i {
    transform: rotate(90deg);
    text-align: center;
  }

  .grading-controls {
    flex-direction: column;
  }

  .grading-controls .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .progress-track__value {
    transition: none;
  }
}