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h2{white-space:nowrap;max-inline-size:100%;margin-inline:auto;font-size:clamp(1.1rem,5vw,3.4rem);line-height:1.05;letter-spacing:max(0,.04em)!important}.quiz-options-quit{white-space:nowrap;text-align:center;min-width:0;font-size:clamp(1rem,4.3vw,1.3rem)}.quiz-score-high,.quiz-score-summary span{white-space:nowrap;text-align:center;max-width:100%}.quiz-score-summary span{font-size:clamp(1rem,4.5vw,1.5rem)}html[lang=vi] .quiz-page h1,html[lang=vi] .quiz-page h2{font-family:Arial,Segoe UI,sans-serif!important}.quiz-app-links img{height:80px!important}.quiz-app-links img[src*=google-play]{height:120px!important}.quiz-app-prompt{color:#fffaf2;background:#4f963d;border-color:#2d6d28}.quiz-app-prompt .eyebrow{color:#dff5c9!important}.quiz-app-prompt h2{color:#ffd76a;font:800 clamp(1.65rem,3.4vw,2.25rem)/1.08 ui-rounded,Nunito,Arial Rounded MT 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img{object-fit:contain;width:28%;height:62%}.quiz-options-wrap{position:relative}.quiz-options{grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;margin:0 0 .9rem;display:grid}.quiz-option{color:#fff;cursor:pointer;perspective:800px;background:0 0;border:0;min-height:4.8rem;padding:0;font-family:Arial,Helvetica,sans-serif;font-size:clamp(1rem,2.8vw,1.35rem);font-weight:700}.quiz-option-card{width:100%;height:100%;min-height:4.8rem;transform-style:preserve-3d;background:#087db2;border-radius:999px;transition:transform .45s;display:block;position:relative}.quiz-option.is-flipped .quiz-option-card{transform:rotateY(180deg)}.quiz-option-face{backface-visibility:hidden;border:0;border-radius:999px;justify-content:center;align-items:center;display:flex;position:absolute;inset:.45rem;overflow:hidden}.quiz-option-front{background:#159bd0;padding:.55rem 1rem}.quiz-option-back{background:#fff;transform:rotateY(180deg)}.quiz-option-back 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h2{margin:.25rem auto .55rem;font-family:Arial,Helvetica,sans-serif;font-size:clamp(1.15rem,2.6vw,1.55rem);font-weight:700;line-height:1.1}.question-counter{color:#fff;background:#5e892ddb;border-radius:999px;justify-content:center;align-items:center;width:fit-content;min-width:5.25rem;height:2.6rem;margin:-.4rem auto 1rem;padding:0 .85rem;font-family:Arial,Helvetica,sans-serif;font-size:1.05rem;line-height:1;display:flex}.question-counter strong{display:block;transform:translateY(.08rem)}.quiz-result{background:#075300cc;border-radius:1rem;margin:1rem 0;padding:1rem}.quiz-result p{margin:.3rem 0;font-size:1.1rem}.quiz-result button{color:#3b2515;cursor:pointer;font:inherit;background:#ffd76a;border:0;border-radius:999px;margin-top:.7rem;padding:.7rem 1.1rem;font-weight:900}@media (width<=560px){.quiz-card .quiz-meta{gap:.45rem}.quiz-card .quiz-stats{flex:1 1 0;gap:.45rem;min-width:0}.quiz-timer,.quiz-score{white-space:nowrap;flex:1 1 0;min-width:0;height:4rem;padding:0 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#087db2;border-radius:3rem;width:100%;height:100%;position:relative;overflow:hidden}.question-stage-face{-webkit-backface-visibility:hidden;backface-visibility:hidden;border-radius:2rem;justify-content:center;align-items:center;transition:transform .55s;display:flex;position:absolute;inset:0;overflow:hidden}.question-stage-front{background:#159bd0;transform:rotateY(0)}.question-stage-front img{object-fit:contain;width:64%;height:100%;transform:scale(1.45)}.question-stage-back{background:#fff;transform:rotateY(180deg)}.question-stage.is-revealed .question-stage-front{transform:rotateY(180deg)}.question-stage.is-revealed .question-stage-back{inset:0;transform:rotateY(0)}.question-stage-back .solution-image{min-width:100%;max-width:none;min-height:100%;display:block;object-fit:cover!important;width:100%!important;height:100%!important}@media (width<=560px){.question-stage-card{border-width:.65rem;border-radius:2rem}.question-stage-face{border-radius:1.35rem}}