:root {
    --sidebar-width: 260px;
    --sidebar-bg: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-active: #3b82f6;
    --sidebar-hover: #334155;
    --topbar-height: 60px;
    --content-bg: #f1f5f9;
}

/* Sidebar */
.admin-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    overflow-y: auto;
    z-index: 1000;
    transition: transform 0.3s;
}

.admin-sidebar .brand {
    padding: 1rem 1.25rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid #334155;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.admin-sidebar .nav-section {
    padding: 0.75rem 0;
}

.admin-sidebar .nav-section-title {
    padding: 0.5rem 1.25rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #64748b;
    font-weight: 600;
}

.admin-sidebar .nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1.25rem;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.admin-sidebar .nav-link:hover {
    background: var(--sidebar-hover);
    color: #e2e8f0;
}

.admin-sidebar .nav-link.active {
    background: var(--sidebar-hover);
    color: #fff;
    border-left-color: var(--sidebar-active);
}

.admin-sidebar .nav-link i {
    font-size: 1.1rem;
    width: 1.25rem;
    text-align: center;
}

/* Topbar */
.admin-topbar {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--topbar-height);
    background: #fff;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    z-index: 999;
}

.admin-topbar .breadcrumb {
    margin: 0;
    font-size: 0.875rem;
}

.admin-topbar .user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Content */
.admin-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--topbar-height);
    padding: 1.5rem;
    min-height: calc(100vh - var(--topbar-height));
    background: var(--content-bg);
}

/* KPI Cards */
.kpi-card {
    background: #fff;
    border-radius: 0.75rem;
    padding: 1.25rem;
    border: 1px solid #e2e8f0;
    transition: transform 0.2s, box-shadow 0.2s;
}

.kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.kpi-card .kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.kpi-card .kpi-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e293b;
}

.kpi-card .kpi-label {
    font-size: 0.8rem;
    color: #64748b;
    margin-top: 0.25rem;
}

/* Status badges */
.badge-status {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.35em 0.65em;
    border-radius: 0.5rem;
}

/* Data tables */
.admin-table {
    background: #fff;
    border-radius: 0.75rem;
    border: 1px solid #e2e8f0;
    overflow: hidden;
}

.admin-table .table {
    margin-bottom: 0;
}

.admin-table .table th {
    background: #f8fafc;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    border-bottom: 2px solid #e2e8f0;
    padding: 0.75rem 1rem;
}

.admin-table .table td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    font-size: 0.875rem;
}

.admin-table .table-toolbar {
    padding: 1rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Cards */
.admin-card {
    background: #fff;
    border-radius: 0.75rem;
    border: 1px solid #e2e8f0;
}

.admin-card .card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid #e2e8f0;
    font-weight: 600;
    background: transparent;
}

/* Page header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0;
}

/* Login page */
.admin-login {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.admin-login .login-card {
    background: #fff;
    border-radius: 1rem;
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* Product image thumbnail */
.product-thumb {
    width: 40px;
    height: 40px;
    border-radius: 0.5rem;
    object-fit: cover;
    background: #f1f5f9;
}

/* Responsive */
@media (max-width: 992px) {
    .admin-sidebar {
        transform: translateX(-100%);
    }
    .admin-sidebar.show {
        transform: translateX(0);
    }
    .admin-topbar {
        left: 0;
    }
    .admin-content {
        margin-left: 0;
    }
}

/* Tree view for categories */
.tree-view .tree-item {
    padding: 0.5rem 0;
}

.tree-view .tree-children {
    padding-left: 1.5rem;
    border-left: 1px dashed #cbd5e1;
    margin-left: 0.75rem;
}

/* Loading spinner */
.loading-overlay {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
}

/* Image upload zone */
.upload-zone {
    border: 2px dashed #cbd5e1;
    border-radius: 0.75rem;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: #f8fafc;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--sidebar-active);
    background: #eff6ff;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
}