body { background-color: #f8f9fa; font-family: 'Segoe UI', sans-serif; }

.kpi-card { transition: transform 0.2s; cursor: default; }
.kpi-card:hover { transform: translateY(-2px); box-shadow: 0 4px 15px rgba(0,0,0,0.1); }

.dash-upload-container {
    border: 2px dashed #007bff;
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    background-color: #f0f8ff;
    cursor: pointer;
}

.regression-sidebar {
    background-color: white;
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.model-coeff-table th { background-color: #343a40; color: white; }
.model-coeff-table td { font-family: monospace; }

.data-loaded { color: #28a745; font-weight: bold; }
.data-missing { color: #dc3545; font-weight: bold; }