:root,
body[data-theme="default"] {
    --sidebar-bg: #212529;
    --sidebar-text: #ced4da;
    --sidebar-hover: #343a40;
    --sidebar-border: #495057;
    --stat-icon-bg: #e9f1ff;
    --stat-icon-color: #0d6efd;
    --card-border: #e9ecef;
}

body[data-theme="default"] {
    background: #f5f7fb;
}