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.choice-letter{background:var(--accent);border-color:var(--accent);color:#fff}.answer-row .math-input{width:100%;max-width:460px}.confirm-bar{border:1px solid var(--border);background:var(--surface);animation:rise .26s var(--ease) both;border-radius:12px;align-items:center;gap:12px;margin-top:18px;padding:12px 14px 12px 18px;display:flex}.confirm-bar span{color:var(--text-2);flex:1}.result{text-align:center;justify-items:center;gap:10px;margin-top:6vh;display:grid}.result-score{font-variant-numeric:tabular-nums;font-size:18px;font-weight:650}.result-steps{width:100%;margin:8px 0 0}@keyframes breathe{50%{opacity:.35}}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb, var(--bad) 55%, transparent)}to{box-shadow:0 0 0 8px #0000}}@keyframes pulse-ok{0%{box-shadow:0 0 0 0 color-mix(in srgb, var(--ok) 55%, transparent)}to{box-shadow:0 0 0 7px #0000}}@keyframes 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