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var(--line);border-radius:10px;background:var(--card);font-size:16px;cursor:pointer;transition:all .15s}.opt-btn:hover{border-color:var(--brand)}.opt-btn.correct{background:var(--ok-soft);border-color:var(--ok)}.opt-btn.wrong{background:var(--bad-soft);border-color:var(--bad)}.feedback{margin-top:10px;padding:12px 16px;border-radius:10px;font-size:15px}.feedback.ok{background:var(--ok-soft);color:#14532d}.feedback.bad{background:var(--bad-soft);color:#7f1d1d}