/* 顶栏使用双字品牌图标，保持菜单和主题切换的原有交互。 */
.app-shell .sidebar-toggle-icon {
    display: block;
    flex: 0 0 auto;
}

.app-shell .sidebar-toggle[aria-expanded="true"] .sidebar-arrow-expand,
.app-shell .sidebar-toggle[aria-expanded="false"] .sidebar-arrow-collapse {
    display: none;
}

.app-shell .sidebar-toggle:focus-visible {
    outline: 2px solid var(--ui-focus);
    outline-offset: 2px;
}

.app-shell .top-bar-left {
    gap: 12px;
}

.app-shell .system-title {
    flex: 0 0 auto;
    margin: 0;
    padding: 0;
    line-height: 1;
}

.app-shell .system-title .brand-wordmark {
    display: block;
    width: 40px;
    height: 28px;
    border-radius: 6px;
    object-fit: cover;
    object-position: center;
    box-shadow: none;
}

@media (max-width: 768px) {
    .app-shell .top-bar-left {
        gap: 8px;
    }
}