.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: transparent;
    padding: 0 var(--space-8);
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.topbar-title {
    font-size: var(--body);
    font-weight: var(--weight-medium);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: auto;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    cursor: pointer;
    font-size: var(--body);
    padding: 0;
    flex-shrink: 0;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.theme-toggle:hover {
    background: var(--surface-bg-hover);
    border-color: var(--border-hover);
    color: var(--accent-primary);
}

.mobile-nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    font-size: var(--title);
    transition: background var(--transition), color var(--transition);
}

.mobile-nav-toggle:hover {
    background: var(--surface-bg-hover);
    color: var(--accent-primary);
}

@media (max-width: 768px) {
    .topbar {
        padding: 0 var(--space-4);
    }
    .mobile-nav-toggle {
        display: flex;
    }
}