/* 左侧导航栏 */
.sidebar {
    width: 240px;
    background: white;
    border-right: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
    background: #f8f9fa;
}

.sidebar-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.sidebar-subtitle {
    font-size: 12px;
    color: #666;
}

.nav-menu {
    flex: 1;
    padding: 10px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: #f0f0f0;
}

.nav-item.active {
    background: #e3f2fd;
    border-left-color: #2196f3;
    color: #2196f3;
}

.nav-item.active .nav-icon {
    color: #2196f3;
}

.nav-icon {
    width: 20px;
    margin-right: 12px;
    font-size: 16px;
}

.nav-text {
    font-size: 14px;
    font-weight: 500;
}

/* 文件分类面板样式 */
.file-categories-panel {
    width: 200px;
    background: white;
    border-right: 1px solid #e0e0e0;
    display: none;
    flex-direction: column;
}

.file-categories-panel.show {
    display: flex;
}

.category-title {
    padding: 20px 20px 15px 20px;
    font-size: 16px;
    font-weight: 600;
    color: #333;
    border-bottom: 1px solid #e0e0e0;
    background: #f8f9fa;
}

.category-item {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
    color: #666;
    border-bottom: 1px solid #f5f5f5;
}

.category-item:hover {
    background: #f8f9fa;
    color: #333;
}

.category-item.active {
    background: #e3f2fd;
    color: #2196f3;
    border-left: 3px solid #2196f3;
    margin-left: -3px;
}

.category-item.active .category-icon {
    color: #2196f3;
}

.category-icon {
    width: 18px;
    margin-right: 12px;
    font-size: 16px;
}

.category-text {
    font-size: 14px;
    font-weight: 400;
}