.topbar {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-8);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.mobile-menu-btn {
  display: none;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.topbar-brand {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.06em;
  color: var(--text-primary);
}

.topbar-version {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  background: var(--bg-tag);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.topbar-icon-btn {
  position: relative;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.topbar-icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.topbar-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  background: var(--brand-primary);
  color: #fff;
  font-size: 10px;
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-left: var(--space-2);
  margin-left: var(--space-1);
  border-left: 1px solid var(--border-color);
  cursor: pointer;
}

.topbar-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-tag);
}

.topbar-username {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}

@media (max-width: 780px) {
  .mobile-menu-btn { display: flex; }
  .topbar { padding: 0 var(--space-4); }
  .topbar-username { display: none; }
  .topbar-version { display: none; }
}