/**
 * TA-UI-001 — Enterprise Platform Navigation
 */
.enterprise-platform-nav {
  display: flex;
  align-items: center;
  gap: var(--tropos-space-3);
  min-height: 2.75rem;
  padding: 0 var(--tropos-space-4);
  background: var(--tropos-bg-elevated, #0f172a);
  border-bottom: 1px solid var(--tropos-border, rgba(148, 163, 184, 0.18));
  color: var(--tropos-text-primary, #e2e8f0);
  font-family: var(--tropos-font-sans, Inter, system-ui, sans-serif);
  font-size: var(--tropos-text-sm, 0.8125rem);
  z-index: 40;
}

.enterprise-platform-nav-brand {
  display: flex;
  align-items: center;
  gap: var(--tropos-space-2);
  min-width: 10rem;
}

.enterprise-platform-nav-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: var(--tropos-radius-sm, 0.35rem);
  background: var(--tropos-brand, #166534);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}

.enterprise-platform-nav-title {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.enterprise-platform-nav-title strong {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--tropos-text-muted, #94a3b8);
}

.enterprise-platform-nav-title span {
  font-weight: 600;
}

.enterprise-platform-nav-products {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex: 1;
  flex-wrap: wrap;
}

.enterprise-platform-nav-link {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--tropos-text-secondary, #cbd5e1);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font: inherit;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.enterprise-platform-nav-link:hover:not(:disabled) {
  background: rgba(148, 163, 184, 0.12);
  color: var(--tropos-text-primary, #f8fafc);
}

.enterprise-platform-nav-link.active {
  background: rgba(22, 101, 52, 0.22);
  border-color: rgba(74, 222, 128, 0.35);
  color: #bbf7d0;
  font-weight: 600;
}

.enterprise-platform-nav-link.unavailable {
  opacity: 0.55;
  cursor: not-allowed;
}

.enterprise-platform-nav-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
}

.enterprise-platform-nav-icon-btn {
  appearance: none;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(15, 23, 42, 0.5);
  color: var(--tropos-text-secondary, #cbd5e1);
  border-radius: var(--tropos-radius-sm, 0.35rem);
  padding: 0.25rem 0.55rem;
  font: inherit;
  cursor: pointer;
}

.enterprise-platform-nav-icon-btn:hover {
  color: var(--tropos-text-primary, #f8fafc);
  border-color: rgba(148, 163, 184, 0.35);
}

.enterprise-platform-nav-host + .product-env-banner,
.enterprise-platform-nav-host + .ops-app,
.enterprise-platform-nav-host + .field-frame {
  /* product shells sit below nav */
}

.app > .enterprise-platform-nav-host {
  grid-column: 1 / -1;
}

.app {
  grid-template-rows: auto 1fr;
}

@media (max-width: 720px) {
  .enterprise-platform-nav {
    flex-wrap: wrap;
    padding: 0.35rem var(--tropos-space-3);
  }
  .enterprise-platform-nav-brand {
    min-width: auto;
  }
  .enterprise-platform-nav-products {
    order: 3;
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.15rem;
  }
}