.formula-index-page,
.formula-detail-page {
  padding-top: 8rem;
}

.formula-index-hero {
  max-width: 860px;
  margin: 0 auto 2rem;
}

.formula-index-hero h1,
.formula-lesson h1 {
  font-size: clamp(2.2rem, 7vw, 4.8rem);
  line-height: 1.02;
  overflow-wrap: break-word;
}

.formula-index-hero > p,
.formula-lesson header > p:last-child {
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--muted-text, #475569);
}

.formula-search {
  display: grid;
  gap: 0.5rem;
  margin-top: 1.5rem;
  font-weight: 800;
}

.formula-search input {
  width: 100%;
  min-width: 0;
  min-height: 50px;
  border: 1px solid #94a3b8;
  border-radius: 12px;
  padding: 0.8rem 1rem;
  font: inherit;
  background: #fff;
  color: #111827;
}

.formula-status {
  max-width: 1100px;
  margin: 0 auto 1rem;
  color: #475569;
}

.formula-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr));
  gap: 1rem;
  max-width: 1100px;
  margin: 0 auto;
}

.formula-index-card {
  min-width: 0;
  max-width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 18px;
  padding: 1.35rem;
  overflow-wrap: break-word;
  background: #fff;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.07);
}

.formula-index-card > * {
  min-width: 0;
  max-width: 100%;
}

.formula-index-card h2 {
  margin: 0.25rem 0 0.6rem;
  font-size: clamp(1.4rem, 2.2vw, 2rem);
  line-height: 1.12;
  overflow-wrap: break-word;
}

.formula-index-card h2 a {
  color: inherit;
  white-space: normal;
}

.formula-card-equation,
.formula-equation {
  max-width: 100%;
  border-left: 5px solid #d71920;
  border-radius: 8px;
  padding: 1rem;
  overflow-wrap: anywhere;
  word-break: normal;
  white-space: normal;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  background: #eef2f7;
}

.formula-lesson {
  min-width: 0;
  max-width: 860px;
  margin: 0 auto;
}

.formula-detail-page > .resources-breadcrumbs {
  max-width: 860px;
  margin: 0 auto 1.5rem;
}

.formula-lesson > header,
.formula-lesson > section {
  min-width: 0;
  max-width: 100%;
  margin-bottom: 1rem;
  border: 1px solid #cbd5e1;
  border-radius: 18px;
  padding: clamp(1.2rem, 4vw, 2rem);
  overflow-wrap: break-word;
  background: #fff;
}

.formula-lesson > header > *,
.formula-lesson > section > * {
  min-width: 0;
  max-width: 100%;
}

.formula-lesson h2 {
  margin-top: 0;
  font-size: 1.25rem;
  line-height: 1.2;
  overflow-wrap: break-word;
}

.formula-equation {
  font-size: clamp(1.2rem, 4vw, 1.8rem);
}

.formula-variables {
  display: grid;
  min-width: 0;
  max-width: 100%;
  gap: 0.65rem;
}

.formula-variables div {
  display: grid;
  grid-template-columns: minmax(70px, 0.25fr) minmax(0, 1fr);
  min-width: 0;
  gap: 1rem;
  border-bottom: 1px solid #e2e8f0;
  padding: 0.65rem 0;
}

.formula-variables dt,
.formula-variables dd,
.formula-example li,
.formula-example strong {
  min-width: 0;
  max-width: 100%;
  overflow-wrap: break-word;
}

.formula-variables dt {
  font-weight: 900;
}

.formula-variables dd {
  margin: 0;
}

.formula-variables dd span {
  display: block;
  color: #64748b;
  font-size: 0.9rem;
}

.formula-example ol {
  max-width: 100%;
  padding-left: 1.25rem;
}

.formula-example strong {
  display: block;
  color: #991b1b;
  font-size: 1.25rem;
}

.formula-takeaway {
  border-left: 7px solid #d71920 !important;
}

.formula-actions {
  text-align: center;
}

.formula-actions .resources-primary-link {
  display: inline-flex;
  max-width: 100%;
  margin-top: 0.5rem;
  white-space: normal;
}

@media (prefers-color-scheme: dark) {
  .formula-index-hero > p,
  .formula-lesson header > p:last-child,
  .formula-status {
    color: #cbd5e1;
  }

  .formula-search input,
  .formula-index-card,
  .formula-lesson > header,
  .formula-lesson > section {
    border-color: #334155;
    background: #0f172a;
    color: #f8fafc;
  }

  .formula-card-equation,
  .formula-equation {
    background: #1e293b;
  }

  .formula-variables div {
    border-color: #334155;
  }

  .formula-variables dd span {
    color: #cbd5e1;
  }
}

@media (max-width: 640px) {
  .formula-index-page,
  .formula-detail-page {
    padding-top: 6rem;
  }

  .formula-detail-page > .resources-breadcrumbs {
    margin-bottom: 1rem;
  }

  .formula-variables div {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.2rem;
  }
}