.contrast-study a,
.footer-links a {
  text-decoration: none;
}

.contrast-study a:hover,
.footer-links a:hover {
  text-decoration: underline;
}

.contrast-opening,
.pressure-matrix,
.pressure-columns,
.topic-runs,
.decision-rail {
  margin-bottom: 24px;
}

.contrast-opening {
  display: grid;
  grid-template-columns: minmax(0, 1.62fr) minmax(280px, 0.86fr);
  gap: 20px;
  align-items: start;
}

.opening-main,
.opening-side,
.matrix-grid,
.pressure-card,
.run-item,
.decision-list li,
.rail-close {
  border-radius: 12px;
  background-color: #ffffff;
  border: 1px solid var(--color-border-subtle);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.06);
}

.opening-main {
  padding: 28px 30px 30px;
}

.contrast-label {
  margin: 0 0 10px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent, #2b6cb0);
}

.opening-main h2,
.section-heading h2 {
  margin: 0;
  color: var(--color-ink);
}

.opening-main h2 {
  font-size: 2rem;
  line-height: 1.1;
}

.opening-main p {
  margin: 16px 0 0;
  color: var(--color-muted);
  line-height: 1.84;
}

.opening-lead {
  font-size: 1.05rem;
}

.opening-side {
  padding: 22px 22px 24px;
}

.opening-side h3 {
  margin: 0 0 12px;
  font-size: 1.08rem;
  color: var(--color-ink);
}

.opening-links {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 12px;
  color: var(--color-muted);
  line-height: 1.72;
}

.section-heading {
  max-width: 900px;
  margin-bottom: 16px;
}

.section-heading.narrow {
  max-width: 760px;
}

.section-heading h2 {
  font-size: 1.72rem;
  line-height: 1.2;
}

.matrix-grid {
  display: grid;
  grid-template-columns: minmax(150px, 0.56fr) minmax(0, 1fr) minmax(0, 1fr);
  overflow: hidden;
}

.matrix-head,
.matrix-cell {
  padding: 18px 18px 20px;
  line-height: 1.76;
}

.matrix-head {
  background: linear-gradient(180deg, rgba(43, 108, 176, 0.13), rgba(43, 108, 176, 0.04));
  color: var(--color-ink);
  font-weight: 700;
}

.matrix-cell {
  color: var(--color-muted);
}

.matrix-grid > * {
  border-bottom: 1px solid var(--color-border-subtle);
}

.matrix-grid > *:nth-last-child(-n + 3) {
  border-bottom: 0;
}

.matrix-grid > *:not(:nth-child(3n + 1)) {
  border-left: 1px solid var(--color-border-subtle);
}

.matrix-key {
  font-weight: 700;
  color: var(--color-ink);
  background-color: rgba(15, 23, 42, 0.02);
}

.column-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.pressure-card {
  padding: 20px 20px 22px;
}

.portable-card {
  border-top: 4px solid rgba(43, 108, 176, 0.58);
}

.bench-card {
  border-top: 4px solid rgba(15, 23, 42, 0.52);
}

.pressure-card h3,
.run-item h3,
.decision-list h3 {
  margin: 0 0 10px;
  color: var(--color-ink);
}

.pressure-card h3 {
  font-size: 1.18rem;
}

.pressure-card p,
.run-item p,
.decision-list p,
.rail-close p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.82;
}

.pressure-card p + p {
  margin-top: 12px;
}

.run-list {
  display: grid;
  gap: 16px;
}

.run-item {
  padding: 18px 20px 20px;
}

.run-item h3 {
  font-size: 1.1rem;
}

.decision-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.decision-list li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 20px 20px;
}

.decision-count {
  display: inline-flex;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  align-items: center;
  justify-content: center;
  background-color: rgba(43, 108, 176, 0.12);
  color: var(--color-ink);
  font-weight: 700;
}

.decision-list h3 {
  font-size: 1.06rem;
}

.decision-list p {
  margin-top: 8px;
}

.rail-close {
  margin-top: 16px;
  padding: 18px 20px 20px;
}

@media (max-width: 1100px) {
  .contrast-opening,
  .column-pair {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 820px) {
  .matrix-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .matrix-grid > * {
    border-left: 0 !important;
  }

  .matrix-head:not(:first-child) {
    border-top: 1px solid var(--color-border-subtle);
  }

  .matrix-cell {
    border-top: 1px solid var(--color-border-subtle);
  }
}

@media (max-width: 720px) {
  .opening-main {
    padding: 22px 20px 24px;
  }

  .opening-main h2 {
    font-size: 1.72rem;
  }

  .decision-list li {
    grid-template-columns: minmax(0, 1fr);
  }
}