.stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.module-card {
  padding: 16px;
}

.module-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.module-card__num {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}

.module-card__title {
  font-size: 20px;
  font-weight: 700;
  margin: 4px 0 6px;
  letter-spacing: -0.02em;
}

.module-card__desc {
  font-size: 15px;
  color: var(--text-secondary);
  margin: 0 0 12px;
  line-height: 1.45;
}

.cta-hero {
  background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
  color: #fff;
  border: none;
  box-shadow: var(--shadow-md);
}

.cta-hero .module-card__desc,
.cta-hero .nav-subtitle {
  color: rgba(255, 255, 255, 0.85);
}

.cta-hero .btn--secondary {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.lesson-reader {
  max-width: 680px;
  margin: 0 auto;
}

.lesson-toc {
  padding: 14px 16px;
  margin-bottom: 16px;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--separator);
}

.lesson-toc__title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 0 0 8px;
  text-transform: uppercase;
}

.lesson-toc ul {
  margin: 0;
  padding-left: 18px;
}

.lesson-toc a {
  font-size: 15px;
  line-height: 1.8;
}

.callout {
  padding: 16px;
  margin: 20px 0;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  background: var(--primary-muted);
}

.callout--task {
  border-left-color: var(--warning);
  background: rgba(245, 158, 11, 0.12);
}

.callout__label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
  color: var(--primary);
}

.callout--task .callout__label {
  color: var(--warning);
}

.lesson-content h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 28px 0 12px;
  letter-spacing: -0.02em;
}

.lesson-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 20px 0 8px;
}

.lesson-content p {
  margin: 0 0 14px;
  line-height: 1.58;
  color: var(--text);
}

.lesson-content ul,
.lesson-content ol {
  margin: 0 0 16px;
  padding-left: 22px;
  line-height: 1.55;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.stat-tile {
  padding: 14px;
  text-align: center;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border: 1px solid var(--separator);
}

.stat-tile__value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
}

.stat-tile__label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.chart-wrap {
  margin-top: 12px;
  padding: 12px 8px 4px;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border: 1px solid var(--separator);
}

.chart-legend {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 8px;
  padding: 0 4px;
}

.milestone-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.milestone-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--separator);
  background: var(--bg-elevated);
  color: var(--text-secondary);
}

.milestone-pill.is-done {
  border-color: var(--success);
  background: var(--success-muted);
  color: var(--success);
}

.health-timeline {
  position: relative;
  padding-left: 20px;
  margin-top: 8px;
}

.health-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--separator);
}

.health-step {
  position: relative;
  padding-bottom: 16px;
}

.health-step::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--separator);
  border: 2px solid var(--bg-grouped);
}

.health-step.is-done::before {
  background: var(--success);
}

.health-step__title {
  font-weight: 600;
  margin: 0 0 4px;
}

.health-step__desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
}

.achievement-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--separator);
}

.achievement-row:last-child {
  border-bottom: none;
}

.achievement-row.is-unlocked .achievement-row__icon {
  filter: none;
  opacity: 1;
}

.achievement-row__icon {
  font-size: 28px;
  opacity: 0.35;
  filter: grayscale(1);
}

.discount-code {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px;
  margin-top: 12px;
  background: var(--primary-muted);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, monospace;
  font-weight: 600;
  font-size: 16px;
}

.habit-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
}

.habit-check {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 2px solid var(--separator);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.habit-check.is-checked {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.quiz-result {
  padding: 14px;
  margin-top: 12px;
  border-radius: var(--radius-sm);
  font-size: 15px;
}

.quiz-result--ok {
  background: var(--success-muted);
  color: var(--success);
}

.quiz-result--fail {
  background: var(--danger-muted);
  color: var(--danger);
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--touch-min);
  padding: 4px 0;
}

.segmented {
  display: flex;
  background: var(--separator);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}

.segmented__btn {
  flex: 1;
  min-height: 36px;
  padding: 0 8px;
  border: none;
  border-radius: 10px;
  background: transparent;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
}

.segmented__btn.is-active {
  background: var(--bg-elevated);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.loading-screen {
  padding: 24px 16px;
}

.loading-screen .skeleton {
  height: 80px;
  margin-bottom: 12px;
}

.error-banner {
  padding: 16px;
  margin: 16px;
  background: var(--danger-muted);
  border-radius: var(--radius-md);
  color: var(--danger);
}