.header {
  height: 64px;
  background-color: var(--background-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-left {
  flex: 1;
}

.header-logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.header-center {
  flex: 1;
  display: flex;
  justify-content: center;
}

.header-project-selector {
  background-color: var(--background);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  min-width: 200px;
}

.header-project-selector:focus {
  outline: none;
  border-color: var(--border-focus);
}

.header-right {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
}

.header-username {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.header-logout {
  background-color: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 200ms ease-in-out;
}

.header-logout:hover {
  background-color: var(--background-tertiary);
  border-color: var(--border-focus);
}