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.letter{color:var(--bg-page);background:var(--text-muted);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:26px;height:26px;font-family:Nunito,sans-serif;font-size:13px;font-weight:800;display:flex}.card.easy .choice .letter{background:var(--accent-green)}.card.medium .choice .letter{background:var(--accent-yellow)}.card.hard .choice .letter{background:var(--accent-pink)}.choice .val{color:#2a2a3a;font-size:16px;font-weight:700}.choice.selected{border-color:var(--accent-teal);background:#e0f7f5}.choice.correct{border-color:var(--accent-green);background:#e8f5e9;box-shadow:0 0 12px #a8e6cf4d}.choice.incorrect{border-color:var(--accent-pink);background:#fce4ec}.choice.disabled{pointer-events:none;opacity:.5}.btn{cursor:pointer;border:none;border-radius:14px;padding:14px 32px;font-family:Nunito,sans-serif;font-size:16px;font-weight:800;transition:all .15s}.btn-primary{background:var(--accent-teal);color:var(--bg-page)}.btn-primary:hover{background:#3dbdb5;transform:translateY(-1px)}.btn-secondary{background:var(--accent-pink);color:var(--bg-page)}.btn-secondary:hover{background:#e85a8a;transform:translateY(-1px)}.btn-ghost{color:#888;letter-spacing:1px;background:0 0;border:1.5px solid #ddd;border-radius:20px;padding:8px 20px;font-family:Space Mono,monospace;font-size:11px}.btn-ghost:hover{color:#666;border-color:#999}.score-card{text-align:center;padding:40px 24px}.score-card .score-number{background:linear-gradient(135deg, var(--accent-teal), var(--accent-purple));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-family:Lilita One,cursive;font-size:64px}.score-card .score-label{color:var(--text-secondary);margin-top:8px;font-size:18px}@keyframes card-enter{0%{opacity:0;transform:translateY(80px)scale(.95)}60%{opacity:1;transform:translateY(-6px)scale(1.01)}to{opacity:1;transform:translateY(0)scale(1)}}@keyframes choice-enter{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes result-bounce{0%{opacity:0;transform:scale(.5)}60%{transform:scale(1.1)}to{opacity:1;transform:scale(1)}}@keyframes result-shake{0%,to{transform:translate(0)}15%{transform:translate(-6px)}30%{transform:translate(5px)}45%{transform:translate(-3px)}60%{transform:translate(2px)}}@keyframes card-exit{to{opacity:0;transform:translate(-120%)rotate(-3deg)}}@keyframes streak-pulse{0%,to{transform:scale(1)}50%{transform:scale(1.15)}}@keyframes streak-burst{0%{transform:scale(1)}30%{transform:scale(1.3)}to{transform:scale(1)}}@keyframes hint-fade{0%{opacity:0}to{opacity:.5}}@keyframes glow-breathe{0%,to{opacity:.6}50%{opacity:1}}@media (prefers-reduced-motion:reduce){.play-card,.card-body,.choice,.result-label,.firework-particle,.next-card-btn,.streak-current{transition:none!important;animation:none!important}.card-illustration{transition:none!important}}