:root{--accent: #FF6600;--accent-l: #FF8533;--accent-d: #CC5200;--bg: #f8f9fa;--bg2: #ffffff;--bg3: #f0f2f5;--text: #1a1a2e;--text2: #4a4a6a;--text3: #8888aa;--border: #e2e4e8;--shadow: 0 2px 12px rgba(0,0,0,.08);--shadow2: 0 8px 30px rgba(0,0,0,.12);--green: #22c55e;--red: #ef4444;--yellow: #f59e0b;--blue: #3b82f6;--radius: 16px;--radius-sm: 12px;--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif}@media (prefers-color-scheme: dark){:root{--bg: #0d0d1a;--bg2: #1a1a2e;--bg3: #252540;--text: #e8e8f0;--text2: #a0a0c0;--text3: #686888;--border: #2a2a45;--shadow: 0 2px 12px rgba(0,0,0,.3);--shadow2: 0 8px 30px 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.2s}.stat-card:active{transform:scale(.97)}.stat-number{font-size:2rem;font-weight:900;background:linear-gradient(135deg,var(--accent),var(--accent-l));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-label{font-size:.75rem;color:var(--text3);margin-top:2px;font-weight:500}.section-title{font-size:1rem;font-weight:700;margin:16px 0 10px}.cat-stats-list{display:flex;flex-direction:column;gap:8px}.cat-progress{margin-bottom:2px}.cat-progress-header{display:flex;justify-content:space-between;font-size:.82rem;margin-bottom:3px}.cat-progress-header span:first-child{font-weight:600}.cat-progress-nums{color:var(--text3);font-weight:500}.session-list{display:flex;flex-direction:column;gap:8px}.session-item{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 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.5s}.level-progress-text{font-size:.75rem;opacity:.8;margin-top:6px;text-align:center}.achievements-grid{display:flex;flex-direction:column;gap:8px}.achievement-card{display:flex;align-items:center;gap:12px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;opacity:.45;filter:grayscale(.8);transition:all .3s}.achievement-card.unlocked{opacity:1;filter:none;border-color:var(--accent);box-shadow:0 2px 10px #ff66001a}.achievement-card-emoji{font-size:1.6rem;flex-shrink:0}.achievement-card-info{flex:1;min-width:0}.achievement-card-name{font-size:.85rem;font-weight:700}.achievement-card-desc{font-size:.72rem;color:var(--text3)}.achievement-check{color:var(--green);font-weight:900;font-size:1.1rem;background:#dcfce7;width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}@media (prefers-color-scheme: dark){.achievement-check{background:#1a3a20}}.achievement-toast{position:fixed;top:20px;left:50%;transform:translate(-50%);z-index:300;animation:toastIn .4s cubic-bezier(.4,0,.2,1),toastOut .4s 3s ease forwards}.achievement-toast-inner{display:flex;align-items:center;gap:12px;background:var(--bg2);border:2px solid var(--accent);border-radius:16px;padding:14px 20px;box-shadow:0 8px 30px #ff66004d;min-width:250px}.achievement-emoji{font-size:2rem}.achievement-title{font-size:.7rem;color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:.5px}.achievement-name{font-size:.95rem;font-weight:800}@keyframes toastIn{0%{transform:translate(-50%) translateY(-80px);opacity:0}to{transform:translate(-50%) translateY(0);opacity:1}}@keyframes toastOut{0%{opacity:1}to{opacity:0;transform:translate(-50%) translateY(-30px)}}.quiz-container{display:flex;flex-direction:column;align-items:center;padding:8px 0}.quiz-mode-row{display:flex;gap:6px;margin-bottom:12px;justify-content:center}.quiz-progress{display:flex;gap:5px;margin-bottom:14px;justify-content:center}.quiz-dot{width:10px;height:10px;border-radius:50%;background:var(--border);transition:all .3s}.quiz-dot.done{background:var(--green);transform:scale(1.1)}.quiz-dot.current{background:var(--accent);transform:scale(1.3);box-shadow:0 0 8px #f606}.quiz-header{display:flex;align-items:center;gap:10px;margin-bottom:14px;justify-content:center}.quiz-score{font-size:.85rem;font-weight:800;color:var(--accent);background:var(--bg3);padding:4px 12px;border-radius:12px}.quiz-combo{font-size:.85rem;font-weight:800;color:#fff;background:linear-gradient(135deg,#ff4500,#ff6b35);padding:4px 12px;border-radius:12px;box-shadow:0 2px 10px #ff450066}.quiz-combo.pop{animation:comboPop .3s ease}@keyframes comboPop{0%{transform:scale(1)}50%{transform:scale(1.3)}to{transform:scale(1)}}.quiz-question{width:100%;max-width:400px;background:var(--bg2);border:1.5px solid var(--border);border-radius:var(--radius);padding:24px 20px;text-align:center;margin-bottom:16px;box-shadow:var(--shadow)}.quiz-prompt-label{font-size:.8rem;color:var(--text3);margin-bottom:6px;font-weight:500}.quiz-prompt{font-size:clamp(1.4rem,5vw,2rem);font-weight:900;color:var(--accent)}.quiz-cat-badge{display:inline-block;margin-top:10px;font-size:.72rem;color:var(--text3);background:var(--bg3);padding:3px 10px;border-radius:8px}.quiz-audio-prompt{display:flex;flex-direction:column;align-items:center;gap:10px}.quiz-play-btn{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-l));font-size:1.8rem;color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 15px #ff66004d;transition:all .2s}.quiz-play-btn:active{transform:scale(.9)}.quiz-audio-prompt p{font-size:.85rem;color:var(--text2)}.quiz-options{width:100%;max-width:400px;display:flex;flex-direction:column;gap:10px}.quiz-option{display:flex;align-items:center;gap:12px;width:100%;padding:14px 16px;background:var(--bg2);border:2px solid var(--border);border-radius:14px;text-align:left;transition:all .2s;cursor:pointer}.quiz-option:active:not(:disabled){transform:scale(.97)}.quiz-option.correct{border-color:var(--green);background:#dcfce7;animation:correctPulse .4s ease}.quiz-option.wrong{border-color:var(--red);background:#fef2f2;animation:shake .4s ease}.quiz-option.faded{opacity:.4}@media (prefers-color-scheme: dark){.quiz-option.correct{background:#1a3a20}.quiz-option.wrong{background:#3a1a1a}}@keyframes correctPulse{0%{transform:scale(1)}50%{transform:scale(1.02)}to{transform:scale(1)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}.option-letter{width:30px;height:30px;border-radius:50%;background:var(--bg3);color:var(--text2);display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:800;flex-shrink:0}.quiz-option.correct .option-letter{background:var(--green);color:#fff}.quiz-option.wrong .option-letter{background:var(--red);color:#fff}.option-text{flex:1;font-size:.95rem;font-weight:600}.option-check{font-weight:900;font-size:1.1rem;flex-shrink:0}.quiz-option.correct .option-check{color:var(--green)}.quiz-option.wrong .option-check{color:var(--red)}.quiz-result{display:flex;flex-direction:column;align-items:center;padding:40px 20px;text-align:center;animation:fadeIn .3s ease}.result-emoji{font-size:4rem;margin-bottom:12px}.result-title{font-size:1.4rem;font-weight:900;margin-bottom:8px}.result-score{font-size:2rem;font-weight:900;color:var(--accent);margin-bottom:16px}.result-stats{display:flex;gap:24px;margin-bottom:8px}.result-stat{display:flex;flex-direction:column;align-items:center}.result-num{font-size:1.5rem;font-weight:800;color:var(--text)}.result-label{font-size:.75rem;color:var(--text3)}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:var(--bg)}.login-container{width:100%;max-width:400px;animation:fadeIn .4s ease}.login-hero{text-align:center;margin-bottom:28px}.login-flag{font-size:4rem;margin-bottom:8px;animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}.login-title{font-size:2.2rem;font-weight:900;background:linear-gradient(135deg,var(--accent),var(--accent-l));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.login-subtitle{font-size:.9rem;color:var(--text3);margin-top:4px}.login-features{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:24px}.login-feature{display:flex;align-items:center;gap:8px;background:var(--bg2);border:1px solid var(--border);border-radius:10px;padding:10px 12px;font-size:.8rem;font-weight:600;color:var(--text2)}.login-feature span{font-size:1.1rem}.login-form{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:24px 20px;box-shadow:var(--shadow)}.login-form h2{font-size:1.2rem;font-weight:800;margin-bottom:16px;text-align:center}.quiz-idk{width:100%;padding:12px;margin-top:4px;border:1.5px dashed var(--border);border-radius:14px;background:transparent;color:var(--text3);font-size:.85rem;font-weight:600;transition:all .2s}.quiz-idk:active{transform:scale(.97);background:var(--bg3)}.shortcut-key{display:inline-block;background:var(--border);color:var(--text3);padding:1px 6px;border-radius:4px;font-size:.7rem;font-weight:700;margin-left:6px}.quiz-shortcut-hint{font-size:.7rem;color:var(--text3);margin-top:10px;text-align:center;opacity:.6}@media (max-width: 768px){.quiz-shortcut-hint,.shortcut-key{display:none}}.quiz-idk-reveal{width:100%;padding:14px;margin-top:4px;background:var(--bg3);border-radius:14px;font-size:.9rem;color:var(--text);text-align:center;border-left:3px solid var(--accent);animation:fadeIn .2s ease}