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var(--line);border-radius:12px;cursor:pointer;background:#fff}.q-opt:hover{border-color:var(--brand-200)}.q-opt.on{border-color:var(--brand);background:var(--brand-50)}.q-opt.right{border-color:var(--ok);background:var(--ok-50)}.q-opt.wrong{border-color:var(--danger);background:var(--danger-50)}.flash{perspective:900px;height:220px;cursor:pointer}.flash>div{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}.flash.flip>div{transform:rotateY(180deg)}.flash .face{position:absolute;inset:0;backface-visibility:hidden;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:30px;font-weight:800;padding:20px;text-align:center;background:linear-gradient(135deg,#fff,var(--brand-50));border:1px solid var(--brand-200)}.flash .back{transform:rotateY(180deg);background:linear-gradient(135deg,var(--brand),var(--brand-700));color:#fff}@media (max-width: 860px){.portal{display:block}.p-top{padding:0 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