.proveedores-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 1.5rem;
}

.proveedor-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.proveedor-header {
    background: #3498db;
    color: white;
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    font-weight: bold;
    font-size: 1.1rem;
}

.section-title {
    font-weight: bold;
    margin: 1rem 0 0.5rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #ecf0f1;
}

.referencia-item {
    padding: 0.75rem;
    margin: 0.5rem 0;
    border-radius: 4px;
    border-left: 4px solid;
}

.referencia-item.pendiente {
    background: #e3f2fd;
    border-color: #2196f3;
}

.referencia-item.devolucion {
    background: #ffebee;
    border-color: #f44336;
}

.referencia-codigo {
    font-weight: bold;
    font-family: monospace;
    color: #2c3e50;
}

.referencia-info {
    font-size: 0.9rem;
    color: #7f8c8d;
    margin-top: 0.25rem;
}