:root {
    --front-sidebar-width: 240px;
    --front-sidebar-collapsed-width: 64px;
    --front-sidebar-bg: #FAFAFA;
    --front-sidebar-border: #f0f0f0;
    --front-sidebar-text: #1F1F1F;
    --front-sidebar-muted: #1F1F1F;
    --front-sidebar-active-bg: rgba(51,102,255,0.06);
    --front-sidebar-active-text: #3366ff;
    --front-sidebar-hover-bg: transparent;
}

/* 整体布局包装器 */
.front-layout-wrapper {
    display: flex;
    flex: 1 1 auto;
    align-items: stretch;
    min-height: 0;
    min-width: 0;
}

/* 左侧边栏 */
.front-sidebar {
    width: var(--front-sidebar-width);
    flex-shrink: 0;
    background: #ffffff;
    transition: width 0.25s ease, transform 0.25s ease;
    display: flex;
    flex-direction: column;
    z-index: 50;
    position: sticky;
    top: 0;
    height: 100vh;
    height: 100dvh;
}

.front-sidebar.open {
    z-index: 60;
}

.front-sidebar.collapsed {
    width: var(--front-sidebar-collapsed-width);
}

.front-sidebar-inner {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
}

/* 侧边栏头部 */
.front-sidebar-header {
    height: 76px;
    display: flex;
    align-items: center;
    flex-shrink: 0;
    gap: 8px;
    overflow: hidden;
    position: relative;
}

.front-sidebar-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1 1 auto;
    min-width: 0;
    text-decoration: none;
    color: inherit;
}

.front-sidebar-brand-icon {
    position: relative;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.front-sidebar-logo-normal,
.front-sidebar-logo-expand {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.front-sidebar-logo-normal > span {
    width: 36px;
    height: 36px;
}

.front-sidebar-logo-normal > span i {
    font-size: 14px;
}

.front-sidebar-logo-expand {
    position: absolute;
    inset: 0;
    opacity: 0;
    pointer-events: none;
    color: var(--front-sidebar-active-text);
    font-size: 14px;
}

.front-sidebar-brand-img {
    height: 36px;
    width: 36px;
    object-fit: contain;
    flex-shrink: 0;
    border-radius: 8px;
}

.front-sidebar-brand-icon .front-sidebar-brand-img {
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.front-sidebar-brand-name {
    font-size: 18px;
    font-weight: 600;
    white-space: nowrap;
    opacity: 1;
    transition: opacity 0.2s ease;
    overflow: hidden;
    text-overflow: ellipsis;
}

.front-sidebar.collapsed .front-sidebar-brand-name {
    opacity: 0;
    pointer-events: none;
}

.front-sidebar.collapsed .front-sidebar-brand {
    justify-content: center;
    flex: 0 0 auto;
}

.front-sidebar.collapsed .front-sidebar-brand-icon:hover .front-sidebar-logo-normal,
.front-sidebar.collapsed .front-sidebar-brand-icon:focus-within .front-sidebar-logo-normal {
    opacity: 0;
    transform: scale(0.85);
}

.front-sidebar.collapsed .front-sidebar-brand-icon:hover .front-sidebar-logo-expand,
.front-sidebar.collapsed .front-sidebar-brand-icon:focus-within .front-sidebar-logo-expand {
    opacity: 1;
    pointer-events: auto;
}

.front-sidebar-toggle {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: none;
    background: transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
    flex-shrink: 0;
    color: var(--front-sidebar-text);
}

/* 用 mask + currentColor 渲染 sidebarToggle.svg，颜色随主题变化 */
.front-sidebar-svg-icon {
    display: inline-block;
    width: 18px;
    height: 18px;
    background-color: currentColor;
    -webkit-mask: url('../images/sidebarToggle.svg') center / contain no-repeat;
            mask: url('../images/sidebarToggle.svg') center / contain no-repeat;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.front-sidebar-svg-icon--toggle {
    width: 20px;
    height: 20px;
}

.front-sidebar-svg-icon--expand {
    width: 20px;
    height: 20px;
}

.front-sidebar-toggle:hover {
    background: var(--front-sidebar-hover-bg);
}

.front-sidebar.collapsed .front-sidebar-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
    z-index: -1;
}

/* 菜单区域 */
.front-sidebar-menu {
    flex: 1 1 auto;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 12px 0;
    scrollbar-width: thin;
    scrollbar-color: #d1d5db transparent;
}

.front-sidebar-menu::-webkit-scrollbar {
    width: 4px;
}

.front-sidebar-menu::-webkit-scrollbar-track {
    background: transparent;
}

.front-sidebar-menu::-webkit-scrollbar-thumb {
    background-color: #d1d5db;
    border-radius: 9999px;
}

.front-sidebar-item {
    position: relative;
    overflow: hidden;
}

.front-sidebar-link {
    display: flex;
    align-items: center;
    padding: 10px 13px;
    margin: 0 10px 10px;
    cursor: pointer;
    line-height: 20px;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
}

.front-sidebar-link:hover {
    color: #3366FF;
    background: transparent;
}

.front-sidebar-link.active,
.front-sidebar-item.active > .front-sidebar-link {
    color: #3366ff;
    background: rgba(51,102,255,0.06);
    border-radius: 8px;
}

.front-sidebar-trigger.active,
.front-sidebar-item.active > .front-sidebar-trigger {
    background: transparent;
    border-radius: 0;
}

.front-sidebar-trigger {
    width: 100%;
    padding: 12px 20px;
    margin: 0;
    border-left: 3px solid transparent;
    border-radius: 0;
    line-height: normal;
}

.front-sidebar-item.expanded > .front-sidebar-trigger {
    color: #3366FF;
}

.front-sidebar-icon {
    width: 20px;
    margin-right: 12px;
    text-align: center;
    flex-shrink: 0;
}

.front-sidebar-text {
    flex: 1 1 auto;
    opacity: 1;
    transition: opacity 0.2s ease;
    overflow: hidden;
    text-overflow: ellipsis;
}

.front-sidebar.collapsed .front-sidebar-text {
    opacity: 0;
    pointer-events: none;
}

.front-sidebar-arrow {
    margin-left: auto;
    font-size: 10px;
    transition: transform 0.2s ease, opacity 0.2s ease;
    opacity: 1;
    flex-shrink: 0;
    width: 16px;
    text-align: center;
}

.front-sidebar.collapsed .front-sidebar-arrow {
    opacity: 0;
}

.front-sidebar-item.expanded > .front-sidebar-trigger .front-sidebar-arrow {
    transform: rotate(90deg);
    color: #667eea;
}

/* 子菜单 */
.front-submenu-wrapper {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
}

.front-sidebar-item.expanded > .front-submenu-wrapper {
    max-height: 1000px;
}

.front-submenu-wrapper > .front-sidebar-link {
    padding-left: 44px;
    color: #1F1F1F;
}

.front-submenu-wrapper > .front-sidebar-link:hover {
    color: #3366FF;
    background: rgba(255,255,255,0.05);
}

.front-submenu-wrapper > .front-sidebar-link.active {
    color: #3366ff;
    background: rgba(51,102,255,0.06);
}

@media (min-width: 769px) {
    /* 折叠状态：已展开的二级菜单不在侧边栏内显示，改作右侧悬浮面板 */
    .front-sidebar.collapsed .front-submenu-wrapper {
        position: fixed;
        left: var(--fs-floating-left, var(--front-sidebar-collapsed-width));
        top: var(--fs-floating-top, 0);
        min-width: 160px;
        max-height: calc(100vh - 16px);
        overflow-y: auto;
        overflow-x: hidden;
        background: #ffffff;
        border: 1px solid var(--front-sidebar-border);
        border-radius: 8px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
        padding: 6px 0;
        z-index: 100;
        visibility: hidden;
        opacity: 0;
        pointer-events: none;
        transform: translateX(-4px);
        transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    }

    .front-sidebar.collapsed .front-sidebar-item.has-children:hover > .front-submenu-wrapper,
    .front-sidebar.collapsed .front-sidebar-item.has-children.is-floating > .front-submenu-wrapper {
        visibility: visible;
        opacity: 1;
        pointer-events: auto;
        transform: translateX(0);
    }

    .front-sidebar.collapsed .front-submenu-wrapper > .front-sidebar-link {
        padding: 8px 16px;
        margin: 0;
        border-radius: 0;
        color: #1F1F1F;
        background: transparent;
    }

    .front-sidebar.collapsed .front-submenu-wrapper > .front-sidebar-link:hover {
        color: #3366FF;
        background: #f5f5f5;
    }

    .front-sidebar.collapsed .front-submenu-wrapper > .front-sidebar-link.active {
        color: #3366ff;
        background: rgba(51, 102, 255, 0.06);
    }

    .front-sidebar.collapsed .front-submenu-wrapper .front-sidebar-text {
        opacity: 1;
        pointer-events: auto;
    }
}

/* 右侧主区域 */
.front-main-area {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}


.front-main-area > main {
    flex: 1 1 auto;
    min-height: 0;
}

/* 移动端抽屉 */
@media (max-width: 768px) {
    .front-sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 260px;
        transform: translateX(-100%);
        border-right: none;
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.08);
    }

    .front-sidebar.open {
        transform: translateX(0);
    }

    .front-sidebar.collapsed {
        width: 260px;
    }

    .front-sidebar.collapsed .front-sidebar-text,
    .front-sidebar.collapsed .front-sidebar-title,
    .front-sidebar.collapsed .front-sidebar-arrow {
        opacity: 1;
        pointer-events: auto;
    }

    .front-sidebar.collapsed .front-sidebar-brand {
        justify-content: flex-start;
        flex: 1 1 auto;
    }

    .front-sidebar.collapsed .front-sidebar-brand-name {
        opacity: 1;
        pointer-events: auto;
    }

    .front-sidebar.collapsed .front-sidebar-brand-icon:hover .front-sidebar-logo-normal,
    .front-sidebar.collapsed .front-sidebar-brand-icon:focus-within .front-sidebar-logo-normal,
    .front-sidebar.collapsed .front-sidebar-brand-icon .front-sidebar-logo-normal {
        opacity: 1;
        transform: none;
    }

    .front-sidebar.collapsed .front-sidebar-brand-icon:hover .front-sidebar-logo-expand,
    .front-sidebar.collapsed .front-sidebar-brand-icon:focus-within .front-sidebar-logo-expand,
    .front-sidebar.collapsed .front-sidebar-brand-icon .front-sidebar-logo-expand {
        opacity: 0;
        pointer-events: none;
    }

    .front-sidebar.collapsed .front-sidebar-toggle {
        position: static;
        opacity: 1;
        pointer-events: auto;
        z-index: auto;
    }

    .front-sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.45);
        z-index: 35;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.25s ease, visibility 0.25s ease;
    }

    .front-sidebar-overlay.open {
        opacity: 1;
        visibility: visible;
    }
}

@media (min-width: 769px) {
    .front-sidebar-overlay {
        display: none;
    }
}

/* 深色模式适配：背景、文本、激活态、图标颜色随主题变化 */
html.dark {
    --front-sidebar-bg: #1f2937;
    --front-sidebar-border: #374151;
    --front-sidebar-text: #e5e7eb;
    --front-sidebar-muted: #9ca3af;
    --front-sidebar-active-bg: rgba(96, 165, 250, 0.12);
    --front-sidebar-active-text: #60a5fa;
    --front-sidebar-hover-bg: rgba(255, 255, 255, 0.06);
}

html.dark .front-sidebar {
    background: var(--front-sidebar-bg);
}

html.dark .front-sidebar-toggle:hover {
    background: var(--front-sidebar-hover-bg);
}

@media (min-width: 769px) {
    html.dark .front-sidebar.collapsed .front-submenu-wrapper {
        background: var(--front-sidebar-bg);
        border-color: var(--front-sidebar-border);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }

    html.dark .front-sidebar.collapsed .front-submenu-wrapper > .front-sidebar-link {
        color: var(--front-sidebar-text);
    }

    html.dark .front-sidebar.collapsed .front-submenu-wrapper > .front-sidebar-link:hover {
        color: var(--front-sidebar-active-text);
        background: rgba(255, 255, 255, 0.06);
    }
}