/* ==========================================================================
   layout.css —— 后台主框架布局
   结构：左侧菜单栏 + 右侧（顶栏 + 内容区）
   ========================================================================== */

.layout {
    display: flex;
    min-height: 100vh;
}

/* ---------- 左侧菜单栏 ---------- */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    height: 100vh;
    color: var(--sidebar-text);
    background: var(--sidebar-bg);
    transition: transform var(--transition);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    height: var(--header-height);
    padding: 0 18px;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
}

.sidebar-brand .brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: 15px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

/* 菜单滚动区：菜单较多时独立滚动，不影响品牌区与底部 */
.sidebar-menu {
    flex: 1;
    padding: 12px 0;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-menu::-webkit-scrollbar {
    width: 6px;
}

.sidebar-menu::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.16);
    border-radius: 3px;
}

/* 分组（可点击展开 / 收起） */

.menu-group {
    margin-bottom: 6px;
}

.menu-group-title {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.4px;
    color: #7d8b9e;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
    transition: color var(--transition), background var(--transition);
}

.menu-group-title:hover {
    color: #cbd5e1;
    background: rgba(255, 255, 255, 0.04);
}

.menu-group-title .group-icon {
    font-size: 13px;
    font-style: normal;
}

.menu-group-title .group-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 展开/收起箭头：收起时指向右侧，展开时旋转 90° 指向下方 */
.menu-group-title .group-arrow {
    font-size: 10px;
    font-style: normal;
    line-height: 1;
    color: #64748b;
    transition: transform var(--transition), color var(--transition);
    flex-shrink: 0;
}

.menu-group.is-open .menu-group-title {
    color: #cbd5e1;
}

.menu-group.is-open .menu-group-title .group-arrow {
    transform: rotate(90deg);
    color: #94a3b8;
}

/* 分组内菜单项容器：默认收起，展开时按内容高度过渡 */
.menu-group-items {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
}

.menu-group.is-open .menu-group-items {
    max-height: 600px;
}

/* 菜单项 */

.menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 18px 9px 30px;
    font-size: 14px;
    color: var(--sidebar-text);
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: background var(--transition), color var(--transition);
    user-select: none;
}

.menu-item:hover {
    color: #fff;
    background: var(--sidebar-bg-hover);
}

.menu-item.active {
    color: #fff;
    background: var(--sidebar-bg-active);
    border-left-color: #fff;
}

.menu-item .menu-icon {
    font-size: 14px;
    font-style: normal;
    width: 16px;
    text-align: center;
    flex-shrink: 0;
}

.menu-item .menu-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-footer {
    padding: 12px 18px;
    font-size: 12px;
    color: #6b7889;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
}

/* ---------- 右侧主体 ---------- */

.main {
    flex: 1;
    min-width: 0;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
}

/* 顶栏 */

.header {
    position: sticky;
    top: 0;
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    height: var(--header-height);
    padding: 0 20px;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

/* 移动端菜单开关（桌面端隐藏） */
.sidebar-toggle {
    display: none;
    padding: 6px 10px;
    font-size: 18px;
    line-height: 1;
    color: var(--color-text-secondary);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.breadcrumb .current {
    color: var(--color-text);
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 10px 5px 5px;
    border-radius: 999px;
    background: var(--color-bg);
}

.user-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
    background: var(--color-primary);
    border-radius: 50%;
    text-transform: uppercase;
}

.user-name {
    font-size: 13px;
    color: var(--color-text-secondary);
}

/* 内容区 */

.content {
    flex: 1;
    padding: 20px;
}


/* ---------- 概览页 ---------- */

.page-title {
    margin: 0 0 4px;
    font-size: 18px;
    font-weight: 600;
}

.page-desc {
    margin: 0 0 18px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 19px;
    border-radius: var(--radius-md);
    background: var(--color-primary-light);
    flex-shrink: 0;
}

.stat-meta {
    min-width: 0;
}

.stat-label {
    font-size: 12px;
    color: var(--color-text-muted);
}

.stat-value {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.3;
}

/* ---------- 菜单占位页 ---------- */

.placeholder {
    padding: 44px 20px;
    text-align: center;
}

.placeholder-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    margin-bottom: 14px;
    font-size: 28px;
    background: var(--color-primary-light);
    border-radius: 50%;
}

.placeholder-title {
    margin: 0 0 8px;
    font-size: 16px;
    font-weight: 600;
}

.placeholder-desc {
    max-width: 520px;
    margin: 0 auto 16px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.table-tag {
    display: inline-block;
    padding: 3px 10px;
    font-family: Menlo, Consolas, monospace;
    font-size: 12px;
    color: var(--color-primary-dark);
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
}

/* ---------- 遮罩（移动端展开菜单时） ---------- */

.sidebar-mask {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 95;
    background: rgba(15, 23, 42, 0.45);
}

.sidebar-mask.show {
    display: block;
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .main {
        margin-left: 0;
    }

    .sidebar-toggle {
        display: inline-block;
    }

    .user-name {
        display: none;
    }
}

@media (max-width: 600px) {
    .content {
        padding: 14px;
    }

    .header {
        padding: 0 14px;
    }

    .breadcrumb .separator,
    .breadcrumb .parent {
        display: none;
    }
}