/* ==========================================================================
   SENTRIUM DESIGN SYSTEM: LAYOUT & SCAFFOLDING
   Dense, Information-Forward, Security Operations Aesthetic
   ========================================================================== */

/* Top Utility Telemetry Bar */
.telemetry-strip {
  background-color: var(--bg-dark);
  color: var(--text-inverse-muted);
  font-size: 0.75rem;
  line-height: 1;
  padding: 8px 24px;
  border-bottom: 1px solid var(--border-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
  letter-spacing: 0.02em;
}

.telemetry-strip .status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-inverse);
  font-weight: 500;
}

.telemetry-strip .pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #27C268;
  display: inline-block;
}

.telemetry-strip .telemetry-metrics {
  display: flex;
  gap: 20px;
}

.telemetry-strip .metric-item span {
  color: var(--text-inverse);
  font-weight: 600;
}

@media (max-width: 768px) {
  .telemetry-metrics {
    display: none;
  }
}

/* Site Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.site-header .container-wide {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--bg-dark);
  border: 1px solid var(--border-strong);
  color: var(--text-inverse);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: -0.02em;
}

.brand-name {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  text-transform: uppercase;
}

/* Navigation Links */
.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  padding: 8px 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--border-strong);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-light);
  padding: 8px 12px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-primary);
}

@media (max-width: 880px) {
  .header-nav {
    display: none;
  }
  
  .mobile-nav-toggle {
    display: block;
  }
  
  .header-nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-bottom: 2px solid var(--border-strong);
    padding: 24px;
    gap: 16px;
    box-shadow: 0 12px 24px rgba(22, 24, 28, 0.08);
  }
}

/* Section Architecture */
.section {
  padding-top: 80px;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--border-light);
}

.section-dark {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
  border-bottom: 1px solid var(--border-dark);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--text-inverse);
}

.section-dark p {
  color: var(--text-inverse-muted);
}

.section-tight {
  padding-top: 48px;
  padding-bottom: 48px;
}

.section-hero {
  padding-top: 72px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--border-light);
}

/* Section Header Structure */
.section-header {
  margin-bottom: 48px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 4px 8px;
  border: 1px solid var(--border-light);
  background-color: var(--bg-surface);
}

.section-dark .section-tag {
  background-color: var(--bg-dark-surface);
  border-color: var(--border-dark);
  color: var(--text-inverse-muted);
}

.section-title {
  margin-bottom: 16px;
}

.section-description {
  font-size: 1.125rem;
  max-width: 680px;
  color: var(--text-secondary);
}

.section-dark .section-description {
  color: var(--text-inverse-muted);
}

/* Footer Architecture */
.site-footer {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
  border-top: 1px solid var(--border-dark);
  padding-top: 64px;
  padding-bottom: 40px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border-dark);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-column h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-inverse-muted);
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-inverse-muted);
}

.footer-links a:hover {
  color: var(--text-inverse);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  font-size: 0.8125rem;
  color: var(--text-inverse-muted);
}

@media (max-width: 680px) {
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

.footer-legal-links a {
  color: var(--text-inverse-muted);
}

.footer-legal-links a:hover {
  color: var(--text-inverse);
}