:root {
  --site-header-bg: rgba(255, 255, 255, 0.82);
  --site-header-border: rgba(0, 0, 0, 0.08);
  --site-header-ink: #111827;
  --site-header-muted: #4b5563;
  --site-header-brand: #ff5000;
  --site-header-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

body {
  margin: 0;
}

.portal-topbar {
  /* sticky moved to [data-site-header] wrapper to fix height issue */
  width: 100%;
  background: var(--site-header-bg);
  border-bottom: 1px solid var(--site-header-border);
  backdrop-filter: blur(12px);
}

[data-site-header] {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  top: env(safe-area-inset-top);
  z-index: 50;
  display: block; /* Ensure it behaves as a block container */
}

.portal-topbar__inner {
  display: flex;
  align-items: center;
  /* justify-content: space-between; Removed to allow margin-left: auto to work */
  gap: 24px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 24px;
}

.portal-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--site-header-ink);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  font-size: 1.25rem;
}

.portal-brand__mark {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  border-radius: 0.5rem;
  background: var(--site-header-brand);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0;
}

.portal-brand__text {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.portal-brand__accent {
  color: var(--site-header-brand);
}

.portal-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 2px;
  margin-left: auto; /* Push to right */
}

.portal-nav::-webkit-scrollbar {
  display: none;
}

.portal-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--site-header-muted);
  padding: 8px 0;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.portal-nav__link:hover {
  color: var(--site-header-brand);
}

.portal-nav__link.is-active {
  color: var(--site-header-brand);
}

.portal-nav__link.is-active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: rgba(255, 80, 0, 0.85);
  border-radius: 2px;
}

.portal-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  /* min-width: max-content; Removed to allow it to collapse when empty */
}

.portal-actions:not(:empty) {
  min-width: max-content;
  margin-left: 32px;
  padding-left: 32px;
  border-left: 1px solid var(--site-header-border);
}

.theme-switcher {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 12px;
  box-shadow: var(--site-header-shadow);
}

.theme-switcher__label {
  font-size: 12px;
  font-weight: 700;
  color: var(--site-header-muted);
  user-select: none;
}

.theme-switcher__btn {
  appearance: none;
  border: 1px solid rgba(0, 0, 0, 0.1);
  background: #fff;
  color: var(--site-header-ink);
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-switcher__btn:hover {
  border-color: rgba(255, 80, 0, 0.25);
  background: rgba(255, 80, 0, 0.06);
  color: var(--site-header-brand);
}

.theme-switcher__btn.is-active {
  border-color: rgba(255, 80, 0, 0.35);
  background: rgba(255, 80, 0, 0.1);
  color: var(--site-header-brand);
}

.theme-switcher__btn:focus-visible,
.portal-nav__link:focus-visible {
  outline: 3px solid rgba(255, 80, 0, 0.35);
  outline-offset: 3px;
  border-radius: 8px;
}