.sub-hero-strip {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 48px 20px;
  text-align: center;
  position: relative;
}

.sub-hero-strip::before {
  content: "REF.DEP-02";
  position: absolute;
  top: 12px;
  left: 20px;
  font-family: "Courier New", Courier, monospace;
  font-size: 10px;
  color: var(--primary);
  opacity: 0.5;
}

.sub-hero-strip h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--accent);
  max-width: 700px;
  margin: 0 auto 12px;
}

.sub-hero-strip p {
  color: var(--muted);
  font-size: 14px;
  max-width: 600px;
  margin: 0 auto;
}

.sub-layout-rail {
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 20px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
}

.sub-rail {
  border-right: 1px solid var(--border);
  padding-right: 24px;
}

.sub-rail-nav {
  list-style: none;
  position: sticky;
  top: 80px;
}

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

.sub-rail-nav a {
  font-family: "Courier New", Courier, monospace;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

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

.sub-content h2 {
  font-size: 1.2rem;
  color: var(--primary);
  margin: 32px 0 12px;
  font-family: "Courier New", Courier, monospace;
}

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

.sub-content p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 14px;
  line-height: 1.7;
}

.sub-content ul {
  margin: 12px 0 16px 20px;
  color: var(--muted);
  font-size: 14px;
}

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

.sub-image-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 32px 0;
}

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

.sub-img-bg {
  height: 200px;
  background-size: cover;
  background-position: center;
  border: 1px solid var(--border);
  margin: 24px 0;
}

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

  .sub-rail {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-right: 0;
    padding-bottom: 16px;
  }

  .sub-rail-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    position: static;
  }

  .sub-image-row {
    grid-template-columns: 1fr;
  }
}