/* Header chrome: environment banner, brand nameplate, product nav, tools. */
.environment-banner {
  padding: var(--space-1) var(--space-4);
  background: var(--color-solar-100);
  color: var(--color-solar-700);
  font-family: var(--font-display);
  font-stretch: var(--wdth-label);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
}
.portal-bar {
  position: relative;
  z-index: 20;
  background: var(--color-bg-surface);
  border-bottom: var(--size-hairline) solid var(--color-border);
}
.portal-bar-inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  width: min(var(--measure-shell), 100%);
  min-height: var(--size-bar);
  margin: 0 auto;
  padding: var(--space-2) var(--space-5);
}
.portal-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-stretch: var(--wdth-nameplate);
  font-weight: 700;
  font-size: var(--text-xl);
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--color-text-primary);
  line-height: 1;
}
.portal-mark {
  display: inline-block;
  flex: 0 0 auto;
  width: 0.7em;
  height: 0.7em;
  border-radius: 50%;
  background: var(--color-solar-500);
  box-shadow: 0 0 0 2px var(--color-solar-100);
}
.portal-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: var(--space-2);
}
.portal-nav-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--size-control);
  padding: 0 var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition:
    color 0.12s,
    background-color 0.12s;
}
.portal-nav-link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-inset);
}
.portal-nav-link.is-current {
  color: var(--color-text-primary);
  font-weight: 600;
  box-shadow: inset 0 calc(-1 * var(--size-rule)) 0 var(--color-solar-500);
  border-radius: 0;
}
@media (max-width: 899px) {
  .portal-bar-inner {
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-3);
  }
  .portal-nav {
    order: 3;
    flex: 1 0 100%;
    flex-wrap: wrap;
    margin-left: 0;
    border-top: var(--size-hairline) solid var(--color-border);
  }
  .portal-nav-link {
    flex: 1 1 auto;
    justify-content: center;
    padding-inline: var(--space-2);
  }
}
.portal-tools {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}
.language-switcher {
  display: inline-flex;
  align-items: stretch;
  border: var(--size-hairline) solid var(--color-border-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-surface);
}
.language-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.75rem;
  height: 2.75rem;
  padding: 0 var(--space-2);
  background: var(--color-bg-surface);
  color: var(--color-text-secondary);
  font-family: var(--font-display);
  font-stretch: var(--wdth-label);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition:
    background-color 0.12s,
    color 0.12s;
}
.language-link + .language-link {
  border-left: var(--size-hairline) solid var(--color-border-strong);
}
.language-link:hover {
  background: var(--color-bg-inset);
  color: var(--color-text-primary);
}
.language-link.is-current {
  background: var(--color-bg-action);
  color: var(--color-text-on-action);
}
.language-link:focus-visible {
  outline-offset: -2px;
  border-radius: 0;
}
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: var(--size-hairline) solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  font: inherit;
  cursor: pointer;
  transition: background-color 0.12s;
}
.theme-toggle:hover {
  background: var(--color-bg-inset);
}
.theme-toggle .icon-auto,
.theme-toggle .icon-dark,
.theme-toggle .icon-light {
  display: none;
}
.theme-toggle[data-theme-mode="auto"] .icon-auto,
.theme-toggle[data-theme-mode="dark"] .icon-dark,
.theme-toggle[data-theme-mode="light"] .icon-light {
  display: block;
}