/* ===== sidebar.css ===== */
.sidebar {
    position: fixed;
    top: var(--layout-header-height);
    left: 0;
    bottom: 0;
    width: var(--layout-sidebar-width);
    background-color: var(--color-bg);
    z-index: 200;
    overflow-x: hidden;
    border-right: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    transition: width var(--animation-speed-normal) cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: flex;
    flex-direction: column;
    -webkit-overflow-scrolling: touch;
}
body.has-topbar .sidebar {
    top: calc(var(--layout-topbar-height) + var(--layout-header-height));
    height: calc(100vh - var(--layout-topbar-height) - var(--layout-header-height));
}
body.sidebar-collapsed .sidebar {
    width: var(--layout-sidebar-collapsed);
}
.sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.sidebar-content::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
}
.sidebar-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    margin: 0 var(--spacing-xs) var(--spacing-xs);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--animation-speed-normal) ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}
.sidebar-item i {
    font-size: var(--font-size-lg);
    min-width: 24px;
    text-align: center;
    color: var(--color-sidebar-icon);
    transition: color var(--animation-speed-normal) ease;
    flex-shrink: 0;
}
.sidebar-item span {
    margin-left: var(--spacing-md);
    transition: opacity var(--animation-speed-normal) ease,
                margin-left var(--animation-speed-normal) ease;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}
.sidebar-item:hover {
    background: rgba(26, 86, 219, 0.08);
    color: var(--color-primary);
}
.sidebar-item:hover i {
    color: var(--color-primary);
}
.sidebar-item.active {
    background: rgba(26, 86, 219, 0.1);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}
.sidebar-item.active i {
    color: var(--color-primary);
}
.sidebar-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-md) var(--spacing-lg);
    transition: all var(--animation-speed-normal) ease;
}
.sidebar-section {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-xs);
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: var(--font-weight-medium);
    transition: all var(--animation-speed-normal) ease;
    white-space: nowrap;
    overflow: hidden;
}
body.sidebar-collapsed .sidebar-item {
    justify-content: center;
    padding: var(--spacing-md) 0;
    margin: 0 auto var(--spacing-xs);
    width: 36px;
}
body.sidebar-collapsed .sidebar-item span {
    opacity: 0;
    margin-left: 0;
    width: 0;
    position: absolute;
}
body.sidebar-collapsed .sidebar-item i {
    margin: 0;
}
body.sidebar-collapsed .sidebar-divider {
    margin: var(--spacing-md) auto;
    width: 28px;
}
body.sidebar-collapsed .sidebar-section {
    opacity: 0;
    height: 0;
    padding: 0;
    margin: 0;
    overflow: hidden;
}

.category-nav {
    padding: 0 var(--spacing-md);
    transition: padding var(--animation-speed-normal) ease;
}
.category-item {
    margin-bottom: var(--spacing-xs);
}
.category-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--animation-speed-normal) ease;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}
.category-header i {
    font-size: var(--font-size-md);
    min-width: 20px;
    text-align: center;
    color: var(--color-sidebar-icon);
    transition: color var(--animation-speed-normal) ease;
    flex-shrink: 0;
}
.category-header span {
    margin-left: var(--spacing-md);
    transition: opacity var(--animation-speed-normal) ease,
                margin-left var(--animation-speed-normal) ease;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}
.category-toggle {
    margin-left: auto;
    transition: transform var(--animation-speed-normal) ease,
                opacity var(--animation-speed-normal) ease;
    color: var(--color-muted);
    font-size: 10px;
    flex-shrink: 0;
}
.category-toggle i {
    min-width: auto;
}
.category-header:hover {
    background: rgba(26, 86, 219, 0.08);
    color: var(--color-primary);
}
.category-header:hover i {
    color: var(--color-primary);
}
.category-header.active {
    background: rgba(26, 86, 219, 0.1);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}
.category-header.active i {
    color: var(--color-primary);
}
.category-header.active .category-toggle {
    transform: rotate(180deg);
}
.subcategories {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--animation-speed-normal) ease,
                padding var(--animation-speed-normal) ease;
    padding: 0 var(--spacing-md);
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
}
.category-header.active + .subcategories {
    max-height: 120px;
    padding: var(--spacing-xs) var(--spacing-md);
}
.subcategory {
    display: block;
    padding: 3px 6px;
    margin: 1px 0;
    font-size: 13px;
    color: #00050a;
    border-radius: var(--radius-sm);
    transition: all var(--animation-speed-fast) ease;
    text-decoration: none;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 0 0 calc(33.333% - 2px);
    box-sizing: border-box;
    min-width: 0;
}
.subcategory:hover {
    background: rgba(6, 10, 38, 0.6) !important; /* 半透明蓝色 */
    color: white;
}
.subcategory.active {
    background: var(--color-primary);
    color: white;
    font-weight: var(--font-weight-medium);
}

body.sidebar-collapsed .category-nav {
    padding: 0;
}
body.sidebar-collapsed .category-header {
    justify-content: center;
    padding: var(--spacing-sm) 0;
    width: 36px;
    margin: 0 auto var(--spacing-xs);
}
body.sidebar-collapsed .category-header span {
    opacity: 0;
    margin-left: 0;
    width: 0;
    position: absolute;
}
body.sidebar-collapsed .category-header i {
    margin: 0;
}
body.sidebar-collapsed .category-toggle {
    opacity: 0;
    position: absolute;
}
body.sidebar-collapsed .subcategories {
    display: none;
}

/* 移动端样式覆盖 */
@media (max-width: 768px) {
    .sidebar {
        width: var(--layout-mobile-sidebar);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
    }
    .sidebar.active {
        transform: translateX(0);
    }
    body.sidebar-collapsed .sidebar {
        transform: translateX(-100%);
    }
    .sidebar-item {
        justify-content: flex-start;
    }
    .sidebar-item span {
        opacity: 1 !important;
        margin-left: var(--spacing-md) !important;
        width: auto !important;
        position: relative !important;
    }
    .category-header {
        justify-content: flex-start;
    }
    .category-header span {
        opacity: 1 !important;
        margin-left: var(--spacing-md) !important;
        width: auto !important;
        position: relative !important;
    }
    .category-toggle {
        opacity: 1 !important;
        position: relative !important;
    }
    .sidebar-divider {
        margin: var(--spacing-md) var(--spacing-lg) !important;
        width: auto !important;
    }
    .sidebar-section {
        opacity: 1 !important;
        height: auto !important;
        padding: var(--spacing-md) var(--spacing-lg) !important;
        margin: 0 !important;
    }
    .subcategories {
        display: flex !important;
    }
}

/* 桌面端折叠动画优化 */
@media (min-width: 769px) {
    body.sidebar-collapsed .sidebar-item span,
    body.sidebar-collapsed .category-header span,
    body.sidebar-collapsed .category-header .category-toggle,
    body.sidebar-collapsed .category-header .category-link,
    body.sidebar-collapsed .subcategories,
    body.sidebar-collapsed .sidebar-section {
        opacity: 0;
        transition: opacity 0.15s ease 0.1s;
    }
    body:not(.sidebar-collapsed) .sidebar-item span,
    body:not(.sidebar-collapsed) .category-header span,
    body:not(.sidebar-collapsed) .category-header .category-toggle,
    body:not(.sidebar-collapsed) .category-header .category-link,
    body:not(.sidebar-collapsed) .subcategories,
    body:not(.sidebar-collapsed) .sidebar-section {
        opacity: 1;
        transition: opacity 0.15s ease;
    }
}