.portal-header {
  height: 3.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0 1rem;
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-header-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.portal-header__left {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 12.5rem;
}

.portal-header__breadcrumb {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-header-text);
}

/* Search trigger */
.portal-header__search {
  flex: 0 1 20rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.625rem;
  background: var(--color-search-bg);
  border: 1px solid var(--color-search-border);
  border-radius: var(--radius-md);
  color: var(--color-search-text);
  font-size: 0.75rem;
  transition:
    border-color var(--motion-fast),
    background var(--motion-fast);
}
.portal-header__search:hover {
  border-color: var(--color-search-border-hover);
}

.portal-header__search-placeholder {
  flex: 1 1 auto;
  text-align: left;
}

.portal-header__search-kbd {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 0.0625rem 0.25rem;
  border-radius: var(--radius-xs);
  background: var(--color-bg-muted);
  color: var(--color-text-4);
}

/* Right cluster */
.portal-header__right {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.portal-header__icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-md);
  color: var(--color-bell-stroke, var(--color-text-3));
  position: relative;
  transition:
    background var(--motion-fast),
    color var(--motion-fast);
}
.portal-header__icon-btn:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-1);
}

.portal-header__bell-dot {
  position: absolute;
  top: 0.375rem;
  right: 0.4375rem;
  width: 0.4375rem;
  height: 0.4375rem;
  border-radius: 50%;
  background: var(--color-red);
  border: 2px solid var(--color-header-bg);
  box-sizing: content-box;
}

/* Tier switcher */
.portal-header__tier {
  position: relative;
}

.portal-header__tier-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3125rem 0.625rem;
  font-size: 0.75rem;
  color: var(--color-text-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition:
    border-color var(--motion-fast),
    background var(--motion-fast);
}
.portal-header__tier-btn:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-border-hover);
}

.portal-header__tier-dot {
  width: 0.4375rem;
  height: 0.4375rem;
  border-radius: 50%;
}

.portal-header__tier-label {
  font-weight: 500;
}

.portal-header__tier-menu {
  position: absolute;
  top: calc(100% + 0.25rem);
  right: 0;
  min-width: 12rem;
  margin: 0;
  padding: 0.25rem;
  list-style: none;
  background: var(--color-dropdown-bg);
  border: 1px solid var(--color-dropdown-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 20;
  animation: fadeInUp var(--motion-enter) both;
}

.portal-header__tier-option {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4375rem 0.625rem;
  font-size: 0.8125rem;
  color: var(--color-text-2);
  border-radius: var(--radius-sm);
  text-align: left;
}
.portal-header__tier-option:hover {
  background: var(--color-dropdown-hover);
}
.portal-header__tier-option.is-active {
  background: var(--color-nav-active);
  color: var(--color-nav-active-text);
}

/* Avatar */
.portal-header__avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--grad-blue-btn);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
}