MADRID – While most of Europe kicked off 2021 with earlier curfews or stay-at-home orders, authorities in Spain insist the new coronavirus variant causing havoc elsewhere is not to blame for a sharp resurgence of cases and that the country can avoid a full lockdown even as its hospitals fill up.The government has been tirelessly fending off drastic home confinement like the one that paralyzed the economy for nearly three months in the spring of 2020, the last time Spain could claim victory over the stubborn rising curve of cases.Infection rates ebbed in October but never completely flattened the surge from summer.