/* term-page.css — term page layout, formula, example, interp guide */

/* =========================================================
   Page Layout — 2-column grid (main + sidebar)
   ========================================================= */
.term-page-layout {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px;
  padding: 32px 24px 80px;
}

.term-page-layout main {
  min-width: 0;
  max-width: 760px;
}

.term-page-layout aside {
  width: 300px;
}

/* =========================================================
   Title Block
   ========================================================= */
h1.term-page__title {
  font-size: 36px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 4px 0 12px;
  color: var(--color-text);
  text-wrap: balance;
}

.meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.meta-small {
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 14px;
}

.meta-small span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.term-page__summary {
  font-size: 19px;
  line-height: 1.55;
  color: var(--color-text-2);
  margin: 8px 0 28px;
  text-wrap: pretty;
}

/* =========================================================
   Body Content Typography
   ========================================================= */
.term-page__body p {
  font-size: var(--font-size-base);
  line-height: 1.75;
  color: var(--color-text-2);
  margin: 0 0 16px;
  text-wrap: pretty;
}

.term-page__body p strong {
  color: var(--color-text);
  font-weight: 600;
}

.term-page__body h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 40px 0 14px;
  color: var(--color-text);
}

.term-page__body h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: 28px 0 10px;
  color: var(--color-text);
}

/* =========================================================
   Formula Block
   ========================================================= */
.formula-block {
  margin: 20px 0 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-accent-tint-2);
  padding: 22px 24px;
}

.formula-block__label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.formula-block__expr {
  font-family: var(--font-mono);
  font-size: var(--font-size-base);
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.formula-block__fraction {
  display: inline-flex;
  flex-direction: column;
  align-items: stretch;
  text-align: center;
  line-height: 1.3;
  min-width: 280px;
}

.formula-block__fraction .frac-num {
  padding: 6px 14px 10px;
}

.formula-block__fraction .frac-den {
  padding: 10px 14px 6px;
}

.formula-block__fraction .frac-bar {
  height: 1.5px;
  background: var(--color-text);
  margin: 0;
}

/* =========================================================
   Example Block
   ========================================================= */
.example-block {
  margin: 24px 0 28px;
  border-left: 3px solid var(--color-accent);
  background: var(--color-accent-tint-2);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 20px 24px;
}

.example-block__header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent-ink);
  margin-bottom: 10px;
}

.example-block__context {
  margin: 0 0 10px;
  font-size: 15.5px;
  color: var(--color-text-2);
}

.example-block__steps {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: 1.9;
  color: var(--color-text-2);
  padding: 8px 0 2px;
}

.example-block__step-label {
  color: var(--color-text-faint);
}

.example-line--highlight {
  color: var(--color-accent-ink);
  font-weight: 600;
}

.example-block__result {
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border-strong);
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--color-accent-ink);
  font-weight: 600;
}

.example-block__result .result-big {
  font-size: 20px;
}

.example-block__source {
  margin-top: 12px;
  font-size: var(--font-size-xs);
  color: var(--color-text-faint);
}

/* =========================================================
   Calculator Footer
   ========================================================= */
.calc-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
  font-size: 13px;
}

.calc-foot__note {
  color: var(--color-text-faint);
  font-size: 13px;
}

/* =========================================================
   Interpretation Guide
   ========================================================= */
.interp-guide {
  margin: 16px 0 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  overflow: hidden;
}

.interp-guide__row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  padding: 14px 18px;
  border-top: 1px solid var(--color-border);
  align-items: start;
}

.interp-guide__row:first-child {
  border-top: 0;
}

.interp-guide__range {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  font-weight: 500;
}

.interp-guide__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.interp-guide__desc {
  font-size: 14.5px;
  color: var(--color-text-2);
  line-height: 1.55;
}

.interp-guide__desc strong {
  color: var(--color-text);
  font-weight: 600;
}

/* =========================================================
   Related Terms Grid
   ========================================================= */
.related-section {
  margin: 40px 0 10px;
}

.related-section__heading {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 14px;
  letter-spacing: -0.005em;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.related-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  color: inherit;
  text-decoration: none;
}

.related-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
  text-decoration: none;
  transform: translateY(-1px);
}

.related-card__badge {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-ink);
  margin-bottom: 6px;
}

.related-card__term {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.related-card__desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* =========================================================
   Sources Block
   ========================================================= */
.term-sources {
  margin: 36px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-size: 12.5px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.term-sources__label {
  font-weight: 600;
  color: var(--color-text-2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 11px;
  display: block;
  margin-bottom: 6px;
}

.term-sources ol {
  margin: 0;
  padding-left: 20px;
}

.term-sources li {
  margin-bottom: 4px;
}

/* =========================================================
   Reviewed / Editorial badge
   ========================================================= */
.term-reviewed {
  margin: 28px 0 0;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.term-reviewed__icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-accent-tint);
  color: var(--color-accent-ink);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.term-reviewed strong {
  color: var(--color-text);
  font-weight: 600;
}

/* =========================================================
   Sidebar — sticky TOC
   ========================================================= */
.term-toc {
  position: sticky;
  top: 78px;
}

/* =========================================================
   Definition-only term page (no calc, narrower layout)
   ========================================================= */
.term-definition-layout {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px;
  padding: 32px 24px 80px;
}

.term-definition-layout main {
  min-width: 0;
  max-width: 760px;
}

.term-definition-layout aside {
  width: 300px;
}

/* =========================================================
   Mobile
   ========================================================= */
@media (max-width: 767px) {
  .term-page-layout,
  .term-definition-layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 20px 18px 60px;
  }

  .term-page-layout aside,
  .term-definition-layout aside {
    width: 100%;
    margin-top: 32px;
  }

  .term-toc {
    position: static;
  }

  h1.term-page__title {
    font-size: 28px;
  }

  .term-page__summary {
    font-size: 17px;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }

  .interp-guide__row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .formula-block {
    padding: 16px;
  }

  .formula-block__expr {
    font-size: var(--font-size-sm);
  }

  .formula-block__fraction {
    min-width: unset;
    width: 100%;
  }

  .example-block {
    padding: 16px;
  }
}