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#06293f}.btn-speak:active{background:var(--blue);color:#fff;transform:scale(.92);box-shadow:none}.btn-speak.speaking{background:var(--blue);color:#fff;animation:pulse-speak .9s ease infinite}.btn-speak.speak-sm{width:32px;height:32px;font-size:15px;box-shadow:none;border-width:1px}@keyframes pulse-speak{0%,to{box-shadow:0 0 #1cb0f680}50%{box-shadow:0 0 0 7px #1cb0f600}}.mc-exercise{display:flex;flex-direction:column;gap:20px}.question-header{display:flex;align-items:flex-start;gap:14px}.question-header .exercise-question{flex:1}.exercise-question{font-size:20px;font-weight:800;color:var(--text);line-height:1.4}.options-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.options-grid.options-1col{grid-template-columns:1fr}.option-btn{padding:18px 14px;border-radius:var(--radius);border:2px solid var(--border);background:var(--surface);font-size:16px;font-weight:700;color:var(--text);box-shadow:0 4px #0d1117;min-height:68px;transition:transform .1s,box-shadow 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