/* Circuit 40s — Supporting pages (about, infrastructure, products, contact) */

/* ── Page hero (light) ── */

.page-hero {
  padding: 120px 0 96px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.page-hero-inner {
  max-width: 720px;
}

.page-hero h1 {
  margin-top: 20px;
  font-size: clamp(2.25rem, 4.5vw, 3.75rem);
}

.page-hero-sub {
  font-size: var(--text-xl);
  color: var(--text-muted);
  margin-top: 20px;
  line-height: 1.6;
}

/* ── Page hero (dark) ── */

.page-hero--dark {
  background: var(--dark);
  border-bottom-color: var(--dark-border);
}

.page-hero--dark h1 { color: var(--text-inv); }
.page-hero--dark .page-hero-sub { color: var(--text-inv-muted); }

/* ── Content sections ── */

.content-section {
  padding: 80px 0;
}

.content-section + .content-section {
  border-top: 1px solid var(--border);
}

.content-block {
  max-width: 720px;
}

.content-block h2 {
  margin-top: 16px;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
}

.content-block p {
  margin-top: 16px;
  color: var(--text-muted);
  font-size: var(--text-base);
  line-height: 1.75;
}

.content-block p + p {
  margin-top: 12px;
}

/* ── About ── */

.about-values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 56px;
}

.about-value {
  background: var(--surface);
  padding: 36px 32px;
}

.about-value-num {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.about-value h4 {
  font-size: var(--text-xl);
  color: var(--text);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.about-value p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.65;
}

/* ── Infrastructure page ── */

.infra-page-diagram {
  margin-top: 64px;
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--dark-surface);
}

.infra-diagram-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--dark-border);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-inv-dim);
}

.infra-diagram-body {
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.infra-layer-row {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: center;
  gap: 20px;
  padding: 16px 20px;
  background: var(--dark-raised);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s;
}

.infra-layer-row:hover { border-color: var(--dark-border-strong); }

.infra-layer-row-id {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.infra-layer-row-desc {
  font-size: var(--text-sm);
  color: var(--text-inv-muted);
}

.infra-layer-row-tag {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-inv-dim);
  background: var(--dark-border);
  padding: 3px 10px;
  border-radius: 3px;
  white-space: nowrap;
}

.infra-connector {
  width: 1px;
  height: 16px;
  background: var(--dark-border);
  margin-left: 40px;
}

/* ── Products comparison page ── */

.products-compare {
  padding: 80px 0;
}

.products-compare-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.product-detail-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.product-detail-card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.product-detail-id {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.product-detail-card h3 {
  font-size: var(--text-2xl);
  color: var(--text);
  letter-spacing: -0.025em;
}

.product-detail-card > p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
}

.product-detail-audience {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.product-detail-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: gap 0.15s;
}

.product-detail-link:hover { gap: 8px; }

/* ── Contact page ── */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
  padding: 80px 0;
}

.contact-content h2 { margin-top: 16px; }
.contact-content p {
  color: var(--text-muted);
  margin-top: 16px;
  font-size: var(--text-base);
  line-height: 1.7;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 32px;
}

.contact-method {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: background 0.15s;
}

.contact-method:hover { background: var(--surface-2); }

.contact-method-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.contact-method-value {
  font-size: var(--text-sm);
  color: var(--text);
  font-weight: 500;
}

/* ── Placeholder pages ── */

.placeholder-section {
  padding: 160px 0 120px;
  min-height: calc(100vh - var(--nav-h) - 100px);
  display: flex;
  align-items: flex-start;
}

.placeholder-inner {
  max-width: 560px;
}

.placeholder-inner h1 {
  margin-top: 20px;
  font-size: clamp(2rem, 4vw, 3rem);
}

.placeholder-inner p {
  margin-top: 16px;
  color: var(--text-muted);
  font-size: var(--text-lg);
}

.placeholder-inner .hero-ctas { margin-top: 36px; }

/* ── Responsive ── */

@media (max-width: 900px) {
  .about-values { grid-template-columns: 1fr 1fr; }
  .products-compare-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 640px) {
  .about-values { grid-template-columns: 1fr; }
  .infra-layer-row { grid-template-columns: 60px 1fr; }
  .infra-layer-row-tag { display: none; }
}