.module-header {
  border-bottom: 1px solid var(--color-line);
  background: var(--color-surface);
}

.module-header__inner {
  padding-block: clamp(2.7rem, 7vw, 5.2rem);
}

.module-header h1 {
  max-width: 940px;
  margin-bottom: 0.45rem;
  font-size: clamp(2rem, 4.5vw, 3.25rem);
}

.module-header__english {
  margin-bottom: 1.25rem;
  color: var(--color-primary);
  font-size: clamp(1rem, 2vw, 1.24rem);
  font-weight: 650;
}

.module-hero__title {
  margin-top: 0.9rem;
}

.module-loading-state {
  margin-top: 2rem;
}

.module-objectives {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.module-objectives__list,
.module-progress {
  padding: 1.1rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-soft);
}

.module-objectives h2,
.module-progress h2 {
  margin-bottom: 0.6rem;
  font-size: 1rem;
}

.module-objectives ul {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.progress-track {
  height: 10px;
  margin: 0.75rem 0 0.55rem;
  overflow: hidden;
  border-radius: 999px;
  background: #dce6e9;
}

.progress-track__value {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--color-primary);
  transition: width 240ms ease;
}

.progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--color-ink-soft);
  font-size: 0.82rem;
}

.storage-notice {
  display: none;
  margin-top: 0.6rem;
  color: #7b3b29;
  font-size: 0.8rem;
}

.storage-notice.is-visible {
  display: block;
}

.module-nav {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--color-line);
  background: rgba(255, 255, 255, 0.96);
}

.module-nav__inner {
  display: flex;
  gap: 0.25rem;
  padding-block: 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.module-nav a {
  flex: 0 0 auto;
  padding: 0.48rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: 0.79rem;
  font-weight: 720;
  text-decoration: none;
  white-space: nowrap;
}

.module-nav a:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.learning-section {
  padding-block: clamp(2.8rem, 6vw, 4.5rem);
  scroll-margin-top: 76px;
}

.learning-section + .learning-section {
  border-top: 1px solid var(--color-line);
}

.learning-section__header {
  max-width: var(--reading-width);
  margin-bottom: 1.5rem;
}

.learning-section__header p {
  margin-bottom: 0;
  color: var(--color-ink-soft);
}

.core-sentence {
  position: relative;
  max-width: 900px;
  margin: 0 0 1.3rem;
  padding: 1.3rem 1.45rem 1.3rem 1.8rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-primary-dark);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 710;
  line-height: 1.65;
}

.core-sentence::before {
  position: absolute;
  inset: 0.8rem auto 0.8rem 0;
  width: 5px;
  border-radius: 0 3px 3px 0;
  background: var(--color-accent);
  content: "";
}

.inline-term {
  position: relative;
  display: inline;
}

.term-trigger {
  display: inline;
  padding: 0.03rem 0.12rem;
  border: 0;
  border-bottom: 1px dashed var(--color-primary);
  background: transparent;
  color: var(--color-primary);
  font-weight: 720;
}

.term-definition {
  position: absolute;
  z-index: 10;
  top: calc(100% + 0.45rem);
  left: 0;
  display: none;
  width: min(330px, 82vw);
  padding: 0.8rem;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  box-shadow: var(--shadow-soft);
  color: var(--color-ink);
  font-size: 0.84rem;
  font-weight: 450;
  line-height: 1.55;
}

.inline-term:hover .term-definition,
.term-trigger:focus + .term-definition,
.term-trigger[aria-expanded="true"] + .term-definition {
  display: block;
}

.progressive-layers {
  display: grid;
  gap: 0.7rem;
}

.progressive-layer {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: clip;
}

.progressive-layer[hidden] {
  display: none;
}

.progressive-layer__header {
  display: grid;
  grid-template-columns: 2.55rem minmax(0, 1fr);
  gap: 0.75rem;
  align-items: center;
  padding: 0.92rem 1rem;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-surface-soft);
}

.progressive-layer__number {
  display: grid;
  width: 2.4rem;
  height: 2.4rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 820;
}

.progressive-layer__header h3 {
  margin-bottom: 0;
}

.progressive-layer__body {
  padding: 1rem 1.15rem;
}

.progressive-layer__body p:last-child {
  margin-bottom: 0;
}

.layer-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 1rem;
}

.layer-status {
  color: var(--color-ink-soft);
  font-size: 0.88rem;
}

.reasoning-card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.reasoning-card {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: 0.7rem;
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-top: 5px solid var(--level-color, var(--color-primary));
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.reasoning-card:nth-child(1) {
  --level-color: #3a7180;
}

.reasoning-card:nth-child(2) {
  --level-color: #4d7a68;
}

.reasoning-card:nth-child(3) {
  --level-color: #8a7043;
}

.reasoning-card:nth-child(4) {
  --level-color: #9a513e;
}

.reasoning-card h3 {
  margin-bottom: 0;
}

.reasoning-card h3 span {
  display: block;
  margin-top: 0.2rem;
  color: var(--color-ink-soft);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.reasoning-card__purpose {
  color: var(--color-ink-soft);
  font-size: 0.9rem;
}

.reasoning-card ul {
  margin-bottom: 0;
  font-size: 0.88rem;
}

.reasoning-card__avoid {
  padding-top: 0.7rem;
  border-top: 1px solid var(--color-line);
  color: #7b3d2b;
  font-size: 0.82rem;
}

.stepper {
  display: grid;
  grid-template-columns: minmax(210px, 0.45fr) minmax(0, 1fr);
  gap: 1rem;
}

.stepper__list {
  display: grid;
  gap: 0.4rem;
}

.step-button {
  display: grid;
  width: 100%;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: center;
  min-height: 48px;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  text-align: left;
}

.step-button__number {
  display: grid;
  width: 1.9rem;
  height: 1.9rem;
  place-items: center;
  border-radius: 50%;
  background: #e6edef;
  color: var(--color-primary-dark);
  font-size: 0.75rem;
  font-weight: 820;
}

.step-button[aria-current="step"] {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-weight: 760;
}

.step-button[aria-current="step"] .step-button__number,
.step-button.is-visited .step-button__number {
  background: var(--color-primary);
  color: #fff;
}

.stepper__stage {
  display: grid;
  min-height: 430px;
  grid-template-rows: auto 1fr auto;
  gap: 1rem;
  padding: 1.4rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.stepper__stage-kicker {
  color: var(--color-accent);
  font-size: 0.76rem;
  font-weight: 820;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stepper__stage h3 {
  margin-bottom: 0.6rem;
  font-size: 1.55rem;
}

.microscope-visual {
  position: relative;
  display: grid;
  min-height: 210px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background:
    radial-gradient(circle at 32% 40%, rgba(185, 83, 60, 0.11) 0 5%, transparent 5.5%),
    radial-gradient(circle at 62% 58%, rgba(23, 77, 93, 0.12) 0 7%, transparent 7.5%),
    radial-gradient(circle at 48% 30%, rgba(185, 83, 60, 0.08) 0 3%, transparent 3.5%),
    repeating-linear-gradient(135deg, #f7f9f9 0 18px, #eff4f5 18px 36px);
}

.microscope-visual::before {
  width: 128px;
  height: 128px;
  border: 12px solid rgba(23, 77, 93, 0.8);
  border-radius: 50%;
  box-shadow:
    0 0 0 10px rgba(255, 255, 255, 0.85),
    0 0 0 11px var(--color-line);
  content: "";
}

.microscope-visual__label {
  position: absolute;
  right: 0.7rem;
  bottom: 0.65rem;
  left: 0.7rem;
  padding: 0.42rem 0.55rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.94);
  color: #733725;
  font-size: 0.78rem;
  font-weight: 780;
  text-align: center;
}

.stepper__controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.stepper__controls-group {
  display: flex;
  gap: 0.5rem;
}

.baseline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.8fr);
  gap: 1rem;
}

.baseline-list {
  display: grid;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.baseline-list li {
  position: relative;
  margin: 0;
  padding: 0.8rem 0.9rem 0.8rem 2.8rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.baseline-list li::before {
  position: absolute;
  top: 0.78rem;
  left: 0.85rem;
  display: grid;
  width: 1.45rem;
  height: 1.45rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-success-soft);
  color: var(--color-success);
  content: "✓";
  font-size: 0.75rem;
  font-weight: 820;
}

.comparison-placeholder {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 280px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: hidden;
}

.comparison-placeholder__side {
  display: grid;
  align-content: center;
  gap: 0.8rem;
  padding: 1rem;
  text-align: center;
}

.comparison-placeholder__side + .comparison-placeholder__side {
  border-left: 1px solid var(--color-line);
  background: var(--color-accent-soft);
}

.cell-pattern {
  display: grid;
  width: 120px;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-inline: auto;
}

.cell-pattern span {
  aspect-ratio: 1;
  border: 4px solid rgba(23, 77, 93, 0.55);
  border-radius: 50%;
  background: rgba(23, 77, 93, 0.12);
}

.comparison-placeholder__side:last-child .cell-pattern span:nth-child(2),
.comparison-placeholder__side:last-child .cell-pattern span:nth-child(5) {
  transform: scale(1.35);
  border-color: rgba(185, 83, 60, 0.65);
  background: rgba(185, 83, 60, 0.14);
}

.placeholder-label {
  color: #733725;
  font-size: 0.76rem;
  font-weight: 800;
}

.factor-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 1rem;
}

.factor-card {
  padding: 0.9rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.factor-card h3 {
  margin-bottom: 0.35rem;
}

.factor-card p {
  margin-bottom: 0;
  color: var(--color-ink-soft);
  font-size: 0.87rem;
}

.case-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.7fr) minmax(0, 1.3fr);
  gap: 1rem;
  align-items: start;
}

.case-brief {
  position: sticky;
  top: 78px;
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.case-brief h3 {
  margin-bottom: 0.4rem;
}

.case-table {
  width: 100%;
  margin: 0.8rem 0;
  border-collapse: collapse;
  font-size: 0.84rem;
}

.case-table th,
.case-table td {
  padding: 0.52rem 0.4rem;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
  text-align: left;
}

.case-table th {
  width: 32%;
  color: var(--color-primary-dark);
}

.quiz-form {
  display: grid;
  gap: 0.8rem;
}

.quiz-question {
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.quiz-question legend {
  width: 100%;
  padding: 0;
  color: var(--color-ink);
  font-weight: 760;
}

.quiz-question__hint {
  margin: 0.25rem 0 0.7rem;
  color: var(--color-ink-soft);
  font-size: 0.78rem;
}

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

.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;
}

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

.option input {
  margin: 0.3rem 0 0;
}

.quiz-question.is-correct {
  border-color: #88b79a;
  background: #fbfefc;
}

.quiz-question.is-review {
  border-color: #d8aa9e;
  background: #fffdfc;
}

.quiz-feedback {
  display: none;
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--color-line);
}

.quiz-feedback.is-visible {
  display: block;
}

.quiz-feedback strong {
  color: var(--color-primary-dark);
}

.quiz-feedback p {
  margin-bottom: 0.4rem;
  font-size: 0.88rem;
}

.quiz-feedback p:last-child {
  margin-bottom: 0;
  color: #7a3d2b;
}

.quiz-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-soft);
}

.quiz-status {
  margin: 0;
  color: var(--color-ink-soft);
  font-size: 0.88rem;
}

.module-completion {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  margin-top: 1rem;
  padding: 1.2rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.module-completion h3 {
  margin-bottom: 0.25rem;
}

.module-completion p {
  margin-bottom: 0;
  color: var(--color-ink-soft);
  font-size: 0.9rem;
}

.module-completion.is-complete {
  border-color: #88b79a;
  background: var(--color-success-soft);
}

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

  .stepper,
  .baseline-grid,
  .case-layout {
    grid-template-columns: 1fr;
  }

  .case-brief {
    position: static;
  }
}

@media (max-width: 720px) {
  .module-objectives {
    grid-template-columns: 1fr;
  }

  .stepper__stage {
    min-height: 0;
  }

  .module-completion {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .reasoning-card-grid,
  .factor-grid {
    grid-template-columns: 1fr;
  }

  .comparison-placeholder {
    grid-template-columns: 1fr;
  }

  .comparison-placeholder__side + .comparison-placeholder__side {
    border-top: 1px solid var(--color-line);
    border-left: 0;
  }

  .layer-controls {
    align-items: stretch;
    flex-direction: column;
  }

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

  .stepper__controls-group,
  .stepper__controls-group .button {
    width: 100%;
  }

  .case-table th,
  .case-table td {
    display: block;
    width: 100%;
  }

  .case-table th {
    padding-bottom: 0;
    border-bottom: 0;
  }
}

.module-scaffold {
  display: grid;
  gap: 1.5rem;
  padding-block: 2.5rem 4rem;
}

.module-scaffold__section {
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.module-scaffold__section > h2 {
  margin-top: 0.25rem;
}

.module-scaffold__core {
  margin-block: 1rem;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--color-primary-soft);
}

.module-scaffold__core span {
  color: var(--color-primary);
  font-weight: 700;
}

.module-scaffold__core p {
  margin-bottom: 0;
  font-size: 1.08rem;
}

.module-scaffold__layers,
.module-scaffold__quiz {
  display: grid;
  gap: 0.8rem;
}

.module-scaffold__layer {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-soft);
}

.module-scaffold__layer summary {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  padding: 0.9rem 1rem;
  cursor: pointer;
}

.module-scaffold__layer summary span {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  flex: 0 0 auto;
  color: white;
  border-radius: 999px;
  background: var(--color-primary);
}

.module-scaffold__layer > div {
  padding: 0 1rem 1rem 3.75rem;
}

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

.module-scaffold__cards article,
.module-scaffold__quiz fieldset {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-soft);
}

.module-scaffold__quiz label {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  margin-top: 0.65rem;
}

.module-scaffold__feedback {
  margin-top: 0.9rem;
  padding: 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
}

@media (max-width: 720px) {
  .module-scaffold__cards {
    grid-template-columns: 1fr;
  }

  .module-scaffold__layer > div {
    padding-left: 1rem;
  }
}