.sub-hero-strip {
  padding: 48px 20px;
  background: linear-gradient(135deg, var(--surface) 0%, rgba(34, 211, 238, 0.08) 100%);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.sub-hero-strip h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  max-width: 800px;
  margin: 0 auto;
}

.sub-hero-strip p {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 12px;
}

.sub-body {
  max-width: var(--visual-max);
  margin: 0 auto;
  padding: 48px 20px 64px;
}

.sub-sidebar-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
}

.sub-rail {
  position: sticky;
  top: 100px;
  align-self: start;
  overflow: hidden;
  max-width: 100%;
}

.sub-rail img {
  max-width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: var(--aesthetic-radius);
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.sub-rail-nav {
  list-style: none;
  border-left: 2px solid var(--border);
  padding-left: 16px;
}

.sub-rail-nav li {
  margin-bottom: 12px;
}

.sub-rail-nav a {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sub-rail-nav a:hover {
  color: var(--primary);
}

.sub-content h2 {
  font-size: 1.5rem;
  margin: 36px 0 16px;
  color: var(--primary);
}

.sub-content h2:first-child {
  margin-top: 0;
}

.sub-content p {
  color: var(--muted);
  margin-bottom: 16px;
}

.sub-content ul {
  margin: 0 0 16px 20px;
  color: var(--muted);
}

.sub-content li {
  margin-bottom: 8px;
}

.sub-callout {
  background: rgba(34, 211, 238, 0.06);
  border-left: 3px solid var(--primary);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0 var(--aesthetic-radius) var(--aesthetic-radius) 0;
}

.sub-callout p {
  margin-bottom: 0;
  color: var(--text);
}

@media (max-width: 768px) {
  .sub-sidebar-layout {
    grid-template-columns: 1fr;
  }

  .sub-rail {
    position: static;
  }
}

@media (max-width: 375px) {
  .sub-rail img {
    max-height: 220px;
  }
}