/* ============================================================
   后台管理面板 - 三栏flex布局 / 导航折叠 / 拖拽调宽
   所有选择器限定在 #admin-main-row 内，不影响其他页面
   ============================================================ */

/* 三栏flex容器 */
#admin-main-row {
    display: flex;
    height: calc(100vh - 180px);
}

/* --- 左侧导航栏 --- */
#admin-nav-col {
    width: 250px;
    min-width: 40px;
    flex-shrink: 0;
    border-right: 1px solid #dee2e6;
    overflow: hidden;
    transition: width 0.2s ease;
}

#admin-nav-col.collapsed {
    width: 40px;
}

#admin-nav-col.collapsed .admin-nav-content {
    display: none;
}

/* 折叠按钮 */
#admin-nav-toggle {
    text-align: right;
    padding: 6px 8px 2px;
    cursor: pointer;
    color: #6c757d;
}

#admin-nav-toggle:hover {
    color: #212529;
}

#admin-nav-col.collapsed #admin-nav-toggle {
    text-align: center;
    padding: 8px 0 4px;
}

/* --- 中间编辑区 --- */
#admin-editor-col {
    flex: 1;
    min-width: 200px;
}

/* --- 拖拽分隔条 --- */
#admin-resizer {
    width: 4px;
    flex-shrink: 0;
    cursor: col-resize;
    background-color: transparent;
    transition: background-color 0.15s;
}

#admin-resizer:hover,
#admin-resizer.active {
    background-color: #0d6efd;
}

/* --- 右侧预览区 --- */
#admin-preview-col {
    width: 300px;
    min-width: 150px;
    max-width: 50%;
    flex-shrink: 0;
    border-left: 1px solid #dee2e6;
    padding-left: 12px;
}