.core-page {
  background: linear-gradient(180deg, #ffffff 0%, #f7fbfb 100%);
}

.core-hero {
  padding: 140px 0 72px;
  background:
    radial-gradient(circle at top right, rgba(0, 165, 165, 0.12), transparent 28%),
    linear-gradient(180deg, #f0f9ff 0%, #f8fbfb 100%);
}

.core-kicker {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(0, 128, 128, 0.1);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.core-hero h1 {
  max-width: 900px;
  margin: 20px 0 18px;
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.08;
}

.core-intro {
  max-width: 760px;
  font-size: 19px;
  color: var(--text-secondary);
}

.core-badge-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.edition-chip,
.edition-label {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.edition-chip {
  background: white;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.core-label {
  background: #b42318;
  color: white;
}

.std-label {
  background: var(--primary-color);
  color: white;
}

.edition-overview {
  padding: 88px 0 40px;
}

.edition-compare {
  padding: 40px 0 100px;
}

.edition-overview-grid,
.compare-grid {
  display: grid;
  gap: 24px;
}

.edition-overview-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 28px;
}

.edition-card,
.compare-card {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
}

.edition-card {
  padding: 32px;
}

.edition-card-accent {
  border-color: rgba(0, 128, 128, 0.22);
  background: linear-gradient(135deg, rgba(0, 128, 128, 0.04) 0%, white 100%);
}

.edition-card h3,
.compare-card h3 {
  margin: 16px 0 12px;
  font-size: 28px;
}

.edition-card p,
.core-callout p,
.compare-card li {
  color: var(--text-secondary);
}

.edition-card ul,
.compare-card ul {
  padding-left: 20px;
}

.edition-card li,
.compare-card li {
  margin: 8px 0;
}

.core-callout {
  padding: 24px 28px;
  border-left: 6px solid var(--primary-color);
  border-radius: 18px;
  background: #f5fbfb;
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.core-callout strong {
  display: block;
  margin-bottom: 8px;
}

.compare-card {
  padding: 28px;
}

.compare-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

@media (max-width: 900px) {
  .edition-overview-grid,
  .compare-columns {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .core-hero {
    padding-top: 110px;
  }

  .edition-overview {
    padding: 72px 0 28px;
  }

  .edition-compare {
    padding: 28px 0 80px;
  }

  .edition-card,
  .compare-card,
  .core-callout {
    padding: 22px;
  }
}