:root{--text:#6b6375;--text-h:#08060d;--text-secondary:#9ca3af;--bg:#fff;--bg-secondary:#f9fafb;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--game-correct:#58cc02;--game-wrong:#ff4b4b;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media (prefers-color-scheme:dark){:root{--text:#9ca3af;--text-h:#f3f4f6;--text-secondary:#6b7280;--bg:#16171d;--bg-secondary:#1f2028;--border:#2e303a;--code-bg:#1f2028;--accent:#c084fc;--accent-bg:#c084fc26;--accent-border:#c084fc80;--social-bg:#2f303a80;--shadow:#0006 0 10px 15px -3px, #00000040 0 4px 6px -2px}}#root{box-sizing:border-box;flex-direction:column;max-width:100%;min-height:100svh;margin:0 auto;display:flex}body{margin:0}h1,h2{font-family:var(--heading);color:var(--text-h);font-weight:500}h1{letter-spacing:-1.68px;margin:32px 0;font-size:56px}@media (width<=1024px){h1{margin:20px 0;font-size:36px}}h2{letter-spacing:-.24px;margin:0 0 8px;font-size:24px;line-height:118%}@media (width<=1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);color:var(--text-h);border-radius:4px;display:inline-flex}code{background:var(--code-bg);padding:4px 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.15s}.filter-tab.active{border-color:var(--accent);background:var(--accent);color:#fff}.level-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:12px;margin-bottom:32px;display:grid}.level-card{background:var(--bg-secondary);border:2px solid var(--border);cursor:pointer;border-radius:16px;flex-direction:column;justify-content:center;align-items:center;padding:20px 16px;font-family:inherit;transition:all .2s;display:flex}.level-card:hover{border-color:var(--accent);transform:translateY(-2px)}.level-value{color:var(--accent);font-size:28px;font-weight:800}.level-label{color:var(--text-secondary);margin-top:4px;font-size:12px}.question-count-section{background:var(--bg-secondary);border-radius:16px;padding:20px}.question-count-section h3{margin:0 0 16px;font-size:16px}.count-options{gap:12px;display:flex}.count-btn{border:2px solid var(--border);background:var(--bg);cursor:pointer;color:var(--text);border-radius:12px;flex:1;padding:12px;font-family:inherit;font-size:18px;font-weight:600;transition:all .15s}.count-btn.active{border-color:var(--accent);background:var(--accent);color:#fff}.mode-screen{min-height:100vh;padding:24px}.mode-header{align-items:center;gap:16px;margin-bottom:16px;display:flex}.mode-header h1{margin:0;font-size:24px}.data-info{color:var(--text-secondary);margin-bottom:24px}.mode-options{flex-direction:column;gap:16px;display:flex}.mode-card{background:var(--bg-secondary);border:2px solid var(--border);cursor:pointer;border-radius:16px;flex-direction:column;align-items:center;gap:8px;padding:24px;font-family:inherit;transition:all .2s;display:flex}.mode-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.mode-icon{font-size:40px}.mode-title{color:var(--text);font-size:18px;font-weight:700}.mode-desc{color:var(--text-secondary);font-size:14px}.loading{height:100vh;color:var(--text-secondary);justify-content:center;align-items:center;font-size:18px;display:flex}.progress-bar{background:var(--bg-secondary);border-radius:6px;width:100%;height:12px;overflow:hidden}.progress-bar-fill{background:var(--game-correct,#58cc02);border-radius:6px;height:100%;transition:width .3s}.hearts{gap:4px;display:flex}.heart{font-size:20px;transition:transform .2s}.heart-full{animation:.3s heartPulse}.heart-empty{opacity:.5}@keyframes heartPulse{0%{transform:scale(1)}50%{transform:scale(1.2)}to{transform:scale(1)}}.game-header{background:var(--bg);z-index:100;align-items:center;gap:16px;padding:16px;display:flex;position:sticky;top:0}.back-btn{background:var(--bg-secondary);cursor:pointer;width:40px;height:40px;color:var(--text-secondary);border:none;border-radius:50%;justify-content:center;align-items:center;font-size:18px;transition:all .15s;display:flex}.back-btn:hover{background:var(--border)}.progress-wrapper{flex:1}.streak-badge{color:#fff;background:linear-gradient(135deg,#ff9500,#ff5e00);border-radius:20px;padding:4px 12px;font-size:14px;font-weight:700;animation:.3s streakPop}@keyframes streakPop{0%{transform:scale(.8)}50%{transform:scale(1.1)}to{transform:scale(1)}}.quiz-card{background:var(--bg-secondary);border-radius:20px;flex-direction:column;justify-content:center;align-items:center;margin-bottom:32px;padding:48px 24px;display:flex}.quiz-question{text-align:center;word-break:keep-all;max-width:100%;font-size:clamp(24px,10vw,64px);font-weight:700;line-height:1.3}.quiz-question.long-text{font-size:clamp(18px,5vw,28px)}.quiz-reading{color:var(--text-secondary);margin-top:12px;font-size:20px}.option-btn{background:var(--bg);border:2px solid var(--border);text-align:left;cursor:pointer;width:100%;color:var(--text);border-radius:12px;padding:16px 20px;font-family:inherit;font-size:18px;transition:all .15s}.option-btn:hover:not(:disabled){border-color:var(--accent);background:var(--bg-secondary)}.option-btn:active:not(:disabled){transform:scale(.98)}.option-btn:disabled{cursor:default}.option-correct{border-color:var(--game-correct,#58cc02);background:#58cc0226;animation:.3s correctPulse}.option-wrong{border-color:var(--game-wrong,#ff4b4b);background:#ff4b4b26;animation:.3s wrongShake}.option-selected{border-color:var(--accent)}@keyframes correctPulse{0%{transform:scale(1)}50%{transform:scale(1.02)}to{transform:scale(1)}}@keyframes wrongShake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}.quiz-screen{flex-direction:column;min-height:100vh;display:flex}.quiz-content{flex:1;width:100%;max-width:500px;margin:0 auto;padding:24px}.options-grid{flex-direction:column;gap:12px;display:flex}.feedback{justify-content:center;align-items:center;gap:12px;padding:20px;font-size:18px;font-weight:700;animation:.3s slideUp;display:flex;position:fixed;bottom:0;left:0;right:0}.feedback.correct{background:var(--game-correct,#58cc02);color:#fff}.feedback.wrong{background:var(--game-wrong,#ff4b4b);color:#fff}.feedback-icon{font-size:24px}.streak-msg{margin-left:8px}.correct-answer{opacity:.9;font-weight:400}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.flashcard-container{perspective:1000px;cursor:pointer;margin-bottom:32px}.flashcard{width:100%;height:280px;transform-style:preserve-3d;transition:transform .6s;position:relative}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;background:var(--bg-secondary);border:2px solid var(--border);border-radius:20px;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;display:flex;position:absolute}.flashcard-back{background:linear-gradient(135deg, var(--accent), #8b5cf6);color:#fff;border:none;transform:rotateY(180deg)}.flashcard-text{text-align:center;padding:0 20px;font-size:48px;font-weight:700}.flashcard-reading{color:var(--text-secondary);margin-top:12px;font-size:20px}.flashcard-back .flashcard-text{font-size:32px}.flashcard-hint{color:var(--text-secondary);opacity:.7;font-size:14px;position:absolute;bottom:20px}.flashcard-back .flashcard-hint{display:none}.btn{cursor:pointer;border:none;border-radius:12px;font-family:inherit;font-weight:600;transition:all .15s}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){filter:brightness(1.1)}.btn-secondary{background:var(--bg-secondary);color:var(--text)}.btn-secondary:hover:not(:disabled){background:var(--border)}.btn-outline{border:2px solid var(--border);color:var(--text);background:0 0}.btn-outline:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.btn-small{padding:8px 16px;font-size:14px}.btn-medium{padding:12px 24px;font-size:16px}.btn-large{padding:16px 32px;font-size:18px}.btn-full{width:100%}.flashcard-screen{flex-direction:column;min-height:100vh;display:flex}.flashcard-content{flex:1;width:100%;max-width:500px;margin:0 auto;padding:24px}.flashcard-actions{gap:12px;display:flex}.known-count{text-align:center;color:var(--text-secondary);margin-top:24px}.result-screen{flex-direction:column;align-items:center;max-width:500px;min-height:100vh;margin:0 auto;padding:48px 24px;display:flex}.result-header{text-align:center;margin-bottom:32px}.result-emoji{margin-bottom:16px;font-size:64px;animation:.5s bounce;display:block}.result-header h1{margin:0;font-size:28px}.result-stats{gap:16px;width:100%;margin-bottom:24px;display:flex}.stat-card{background:var(--bg-secondary);border-radius:16px;flex-direction:column;flex:1;align-items:center;padding:20px;display:flex}.stat-value{color:var(--accent);font-size:32px;font-weight:800}.stat-label{color:var(--text-secondary);margin-top:4px;font-size:14px}.result-summary{color:var(--text-secondary);margin-bottom:24px}.wrong-answers{background:var(--bg-secondary);border-radius:16px;width:100%;margin-bottom:32px;padding:20px}.wrong-answers h3{margin:0 0 16px;font-size:16px}.wrong-answers ul{margin:0;padding:0;list-style:none}.wrong-answers li{border-bottom:1px solid var(--border);align-items:center;gap:8px;padding:12px 0;display:flex}.wrong-answers li:last-child{border-bottom:none}.wrong-question{font-weight:600}.wrong-arrow{color:var(--text-secondary)}.wrong-correct{color:var(--game-correct,#58cc02)}.result-actions{flex-direction:column;gap:12px;width:100%;display:flex}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}*{box-sizing:border-box}