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button.dung{background:#eef7e2;border-color:#5a981d}.khoi-dong button.dung .chu-cai{color:#fff;background:#5a981d}.khoi-dong button.sai{background:#fff4ec;border-color:#e2a07a}.khoi-dong button.sai .chu-cai{color:#fff;background:#c2410c}.khoi-dong .giai-thich{color:#3c4a33;margin:10px 2px 0;font-size:14.5px}.khoi-dong .goi-y-kd{color:var(--muted);margin:8px 2px 0;font-size:12.5px}.huong-giai{background:#fffaf0;border:1.5px solid #f1dfb4;border-radius:14px;padding:10px 14px 8px;animation:.4s both hien}.huong-giai .nhan{color:#a8741a}.huong-giai ol{margin:4px 0 0;padding-left:24px;list-style:decimal}.huong-giai li{border-radius:8px;margin:4px 0;font-size:15.5px;line-height:1.6;transition:background .3s,color .3s;animation:.5s both hien}.huong-giai li::marker{color:#a8741a;font-weight:800}.huong-giai li.xong{color:#7b806f}.huong-giai li.xong::marker{content:"✓  ";color:#5a981d}.huong-giai li.dang{color:#4a3608;background:#fdf0cf;margin-left:-6px;padding-left:6px;font-weight:700}@media (max-width:1000px){.giang .bang{grid-template-rows:minmax(200px,42%) minmax(0,1fr);grid-template-columns:minmax(0,1fr)}.giang .bang.khong-hinh{grid-template-rows:minmax(0,1fr)}}@media (max-width:700px){.giang .than{padding:8px 10px 0;display:block;overflow:hidden}.giang .bang{grid-template-rows:minmax(180px,40%) minmax(0,1fr);min-height:0}.giang .loi-giai{padding:12px 14px 40px}.o-mang{width:62px;height:62px}.bong.bong-giang{max-width:calc(100% - 62px)}.o-nhap.gon .di-tiep,.nut-hoi-mang,.tam-dung{height:42px;padding:0 13px;font-size:13px}.bong-giang .noi{font-size:15px}.cac-dong.co-ghi-chu{grid-template-columns:minmax(0,1fr);gap:0}.ghi-chu-le{max-width:none;margin:-2px 0 4px}}@media (prefers-reduced-motion:reduce){.khoi-dong,.huong-giai,.huong-giai li,.bong.bong-giang,.ghi-chu-le{animation:none}}.ghi-chu-bong{color:var(--muted);align-items:center;gap:8px;margin:6px 0 0;font-size:12.5px;display:flex}.ghi-chu-bong .cham i{width:5px;height:5px}