/* ===== Reference Block: Terms and Formulas (for tests and review pages) ===== */

:root {
  --ref_radius: 12px;
  --ref_title: #1F2A44;
  --ref_text: #1e293b;

  /* Terms — teal accent */
  --terms_bg: #f8fafc;
  --terms_border: #0E7490;
  --terms_name: #0E7490;
  --terms_item_bg: #ffffff;
  --terms_item_border: #cffafe;

  /* Formulas — gold accent */
  --formulas_bg: #fffbeb;
  --formulas_border: #C9A227;
  --formulas_name: #7a5f0a;
  --formulas_item_bg: #ffffff;
  --formulas_item_border: #fde68a;
}

/* ---------- Shared container look ---------- */
.lesson_terms,
.lesson_formulas {
  border-radius: var(--ref_radius);
  padding: 18px 20px;
  margin: 20px 0;
  box-shadow: 0 2px 8px rgba(31, 42, 68, 0.08);
}

.lesson_terms_title,
.lesson_formulas_title {
  margin: 0 0 12px 0;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ref_title);
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ================= TERMS ================= */
.lesson_terms {
  background: var(--terms_bg);
  border: 1px solid #e2e8f0;
  border-top: 5px solid var(--terms_border);
}

.lesson_terms_title::before {
  content: "\1F4D6"; /* open book */
  font-size: 1.2rem;
}

.lesson_terms_list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
}

.lesson_terms_item {
  background: var(--terms_item_bg);
  border: 1px solid var(--terms_item_border);
  border-left: 4px solid var(--terms_border);
  border-radius: 10px;
  padding: 10px 14px;
}

.lesson_terms_name {
  margin: 0 0 4px 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--terms_name);
}

.lesson_terms_def {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--ref_text);
}

/* ================= FORMULAS ================= */
.lesson_formulas {
  background: var(--formulas_bg);
  border: 1px solid #fde68a;
  border-top: 5px solid var(--formulas_border);
}

.lesson_formulas_title::before {
  content: "\1F4D0"; /* triangular ruler */
  font-size: 1.2rem;
}

.lesson_formulas_list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lesson_formulas_item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 16px;
  background: var(--formulas_item_bg);
  border: 1px solid var(--formulas_item_border);
  border-radius: 10px;
  padding: 10px 14px;
}

.lesson_formulas_name {
  flex: 0 0 230px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--formulas_name);
}

.lesson_formulas_expr {
  flex: 1 1 260px;
  font-size: 1.05rem;
  color: var(--ref_text);
  overflow-x: auto;
}

/* ---------- Mobile adaptation ---------- */
@media (max-width: 480px) {
  .lesson_terms,
  .lesson_formulas {
    padding: 14px 14px;
  }
  .lesson_terms_title,
  .lesson_formulas_title {
    font-size: 1.15rem;
  }
  .lesson_formulas_name {
    flex-basis: 100%;
  }
}