@import"https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&display=swap";:root{--duo-green: #433f69;--duo-green-dark: #352f56;--duo-green-light: #e8e6f0;--duo-blue: #d66567;--duo-blue-dark: #c05153;--duo-blue-light: #fde8e8;--duo-red: #FF4B4B;--duo-red-dark: #EA2B2B;--duo-red-light: #FFDFE0;--duo-orange: #FF9600;--duo-orange-light: #FFF7E6;--duo-gold: #FFC800;--duo-gold-dark: #E5A600;--duo-purple: #7c6faa;--duo-gray: #E5E5E5;--duo-gray-dark: #AFAFAF;--duo-text: #3a3754;--duo-text-light: #777777;--duo-bg: #FFFFFF;--duo-bg-light: #f4f7fe;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 9999px;--shadow-sm: 0 2px 4px rgba(0,0,0,.06);--shadow-md: 0 4px 12px rgba(0,0,0,.1);--shadow-lg: 0 8px 24px rgba(0,0,0,.15);--transition: .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Nunito,-apple-system,BlinkMacSystemFont,Segoe 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svg{overflow:visible;width:100%;height:100%}.path-connector.completed{color:var(--duo-gold)}.lesson-node{display:flex;flex-direction:column;align-items:center;cursor:pointer;-webkit-tap-highlight-color:transparent}.node-circle{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:800;transition:all var(--transition);position:relative}.node-circle.completed{background:var(--duo-gold);border-bottom:4px solid var(--duo-gold-dark);color:#fff}.node-circle.completed:hover{transform:scale(1.08);box-shadow:0 0 16px #ffc8004d}.node-circle.active{background:var(--duo-green);border-bottom:4px solid var(--duo-green-dark);color:#fff;animation:bounce 1.5s ease infinite,pulseGlow 2s ease infinite;width:72px;height:72px;font-size:28px}.node-circle.active:hover{filter:brightness(1.1)}.node-circle.locked{background:var(--duo-gray);border-bottom:4px solid 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ease}.exercise-instruction{font-size:15px;font-weight:700;color:var(--duo-text-light);text-align:center;margin-bottom:12px}.exercise-prompt{font-size:24px;font-weight:800;text-align:center;margin-bottom:32px;line-height:1.3;color:var(--duo-text)}.speak-btn{width:80px;height:80px;border-radius:50%;background:var(--duo-blue);border:none;border-bottom:4px solid var(--duo-blue-dark);color:#fff;font-size:32px;cursor:pointer;display:flex;align-items:center;justify-content:center;margin:0 auto 24px;transition:all var(--transition)}.speak-btn:hover{filter:brightness(1.1)}.speak-btn:active{transform:translateY(2px);border-bottom-width:2px}.speak-btn.speaking{animation:pulseGlow 1s ease infinite;background:var(--duo-blue-dark)}.options-list{display:flex;flex-direction:column;gap:12px}.option-card{background:var(--duo-bg);border:2px solid var(--duo-gray);border-bottom:4px solid var(--duo-gray);border-radius:var(--radius-md);padding:14px 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.option-number{background:var(--duo-green);border-color:var(--duo-green);color:#fff}.option-card.wrong{border-color:var(--duo-red);border-bottom-color:var(--duo-red-dark);background:var(--duo-red-light);animation:shake .5s ease;pointer-events:none}.option-card.wrong .option-number{background:var(--duo-red);border-color:var(--duo-red);color:#fff}.option-card:disabled{pointer-events:none;opacity:.7}.fill-input-area{margin-bottom:24px}.fill-input{width:100%;padding:14px 16px;border:2px solid var(--duo-gray);border-bottom:4px solid var(--duo-gray);border-radius:var(--radius-md);font-size:18px;font-weight:600;font-family:inherit;text-align:center;color:var(--duo-text);background:var(--duo-bg);transition:all var(--transition)}.fill-input:focus{outline:none;border-color:var(--duo-blue);border-bottom-color:var(--duo-blue-dark);box-shadow:0 0 0 3px 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