/* ——— Problem Grid ——— */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
  max-width: 800px;
}

.problem-card {
  background: white;
  border: 1px solid var(--chalk);
  padding: 20px;
  border-radius: 4px;
}

.problem-num {
  font-family: var(--mono);
  font-size: 0.55rem;
  font-weight: 700;
  color: var(--sand);
  margin-bottom: 8px;
}

.problem-title {
  font-family: var(--sans);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink);
}

.problem-card p {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--dust);
  margin: 0;
}


/* ——— IA Comparison ——— */
.ia-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
  max-width: 900px;
}

.ia-col-header {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 8px 16px;
  border-radius: 4px 4px 0 0;
  margin-bottom: 0;
}

.ia-current {
  background: #f5f0ea;
  color: var(--dust);
}

.ia-proposed {
  background: var(--ember);
  color: white;
}

.ia-tree {
  background: white;
  border: 1px solid var(--chalk);
  border-radius: 0 0 4px 4px;
  padding: 16px;
}

.ia-section {
  margin-bottom: 4px;
}

.ia-section-label {
  font-family: var(--mono);
  font-size: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sand);
  padding: 4px 8px;
  margin-bottom: 2px;
}

.ia-item {
  font-family: var(--sans);
  font-size: 0.78rem;
  padding: 5px 8px;
  border-radius: 3px;
  color: var(--ink);
}

.ia-item.ia-bot {
  font-weight: 500;
}

.ia-item.ia-dim {
  color: var(--sand);
  font-size: 0.72rem;
}

.ia-item.ia-new {
  font-weight: 600;
}

.ia-item.ia-parent {
  font-weight: 500;
}

.ia-item.ia-problem {
  background: #fff5f0;
  border: 1px solid #f0ddd4;
}

.ia-children {
  padding-left: 16px;
  margin-top: 2px;
}

.ia-child {
  font-size: 0.72rem;
  padding: 3px 0;
  color: var(--dust);
}

.ia-tag {
  font-family: var(--mono);
  font-size: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 1px 5px;
  border-radius: 2px;
  background: var(--chalk);
  color: var(--dust);
  margin-left: 4px;
  vertical-align: middle;
}

.ia-tag-new {
  background: var(--ember);
  color: white;
}

.ia-detail {
  font-size: 0.65rem;
  color: var(--sand);
  margin-left: 4px;
}

.ia-divider {
  height: 1px;
  background: var(--chalk);
  margin: 8px 0;
}


/* ——— Change List ——— */
.change-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.change-item {
  display: flex;
  gap: 16px;
  align-items: baseline;
}

.change-action {
  font-family: var(--mono);
  font-size: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  min-width: 110px;
  flex-shrink: 0;
  padding-top: 3px;
}

.change-research {
  color: var(--ember);
}

.change-validated {
  color: #0D9488;
}

.change-instinct {
  color: var(--sand);
}

.change-desc {
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--ink);
}

.change-desc strong {
  font-weight: 700;
}


/* ——— Citations ——— */
.cite {
  color: var(--ember);
  text-decoration: none;
  font-size: 0.65em;
  font-family: var(--mono);
  font-weight: 700;
}

.cite:hover {
  text-decoration: underline;
}


/* ——— Source List ——— */
.source-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 16px;
}

.source-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 12px;
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink);
  transition: background 0.15s;
}

.source-item:hover {
  background: white;
}

.source-title {
  font-size: 0.85rem;
  font-weight: 500;
}

.source-domain {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--sand);
  letter-spacing: 0.02em;
}


/* ——— Mobile ——— */
@media (max-width: 640px) {
  .problem-grid {
    grid-template-columns: 1fr;
  }

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

  .change-item {
    flex-direction: column;
    gap: 4px;
  }
}