:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}:root{--primary-color: #4f46e5;--secondary-color: #8b5cf6;--accent-color: #6366f1;--background-color: #f8fafc;--text-color: #334155;--header-height: 80px;--footer-height: 60px;--border-radius-sm: 4px;--border-radius-md: 8px;--border-radius-lg: 12px;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--font-size-sm: .875rem;--font-size-md: 1rem;--font-size-lg: 1.25rem;--font-size-xl: 1.5rem}html,body{min-width:320px;min-height:100vh}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}h1{font-size:2.5rem;line-height:1.1}h2{font-size:1.5rem;line-height:1.2}button{border-radius:var(--border-radius-md);border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto 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auto}.skill-header{color:var(--primary-color);text-align:center;margin-bottom:var(--spacing-md)}.content-section{width:100%;padding:var(--spacing-md);margin-bottom:var(--spacing-md)}.form-group{display:flex;flex-direction:column;gap:var(--spacing-md);width:100%;max-width:350px;align-items:center}.form-label{font-size:var(--font-size-md);font-weight:700;color:var(--text-color)}.input-base{padding:.8rem 1rem;font-size:1.5rem;border:2px solid #ddd;border-radius:var(--border-radius-md);transition:border-color .3s;text-align:center;width:100%}.input-base:focus{outline:none;border-color:var(--primary-color)}.input-error{border-color:#ef4444;background-color:#fee2e2}.button{border:none;padding:.75em 1.5em;font-size:var(--font-size-md);font-weight:600;border-radius:var(--border-radius-md);cursor:pointer;transition:background .2s,box-shadow .2s,transform .1s;box-shadow:0 2px 4px #0000000a}.button-primary{background-color:var(--accent-color);color:#fff}.button-primary:hover{background-color:var(--primary-color)}.button-secondary{background-color:#f3f4f6;color:var(--text-color);border:1px solid #ddd}.button-secondary:hover{background-color:#e5e7eb}.button-group{display:flex;justify-content:center;gap:var(--spacing-md);margin-top:var(--spacing-md)}.modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#0000004d;display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background:#fff;border-radius:var(--border-radius-lg);padding:var(--spacing-xl);box-shadow:0 8px 32px #0000002e;min-width:300px;max-width:90vw;text-align:center}.modal-content.correct{border:2px solid #22c55e}.modal-content.incorrect{border:2px solid #ef4444}.feedback-message{width:100%;text-align:center;padding:var(--spacing-md);border-radius:var(--border-radius-md)}.feedback-message-correct{color:#22c55e;background:#f0fdf4}.feedback-message-incorrect{color:#ef4444;background:#fef2f2}.worked-solution-panel{background-color:#f8fafc;padding:1.5rem;border-radius:var(--border-radius-md);width:100%;max-width:500px;border:1px solid #e2e8f0;margin-top:1rem}.solution-step{margin-bottom:1rem;font-size:1.1rem;line-height:1.6}.solution-step code{background-color:#eef2ff;padding:.2em .4em;border-radius:4px;font-family:monospace;font-size:1.05em}.solution-step .fraction-inline{display:inline-flex;flex-direction:column;align-items:center;line-height:1;vertical-align:middle;margin:0 .2em;font-size:1em}.solution-step .fraction-inline .numerator{border-bottom:1.5px solid var(--text-color);padding-bottom:.05em}.solution-step .fraction-inline .denominator{padding-top:.05em}.final-answer-emphasis{font-weight:700;color:var(--accent-color);font-size:1.2em}.problem-display-area{font-size:1.5rem;font-weight:700;color:var(--text-color);margin-bottom:1rem;text-align:center}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--background-color);color:var(--text-color);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{display:flex;flex-direction:column;min-height:100vh;width:100%}.app{display:flex;flex-direction:column;min-height:100vh}header{background:linear-gradient(to right,var(--primary-color),var(--secondary-color));color:#fff;padding:1.5rem;text-align:center;height:var(--header-height);display:flex;flex-direction:column;justify-content:center}header h1{font-size:2.5rem;margin-bottom:.5rem}main{flex:1;padding:2rem;max-width:1280px;margin:0 auto;width:100%}.dashboard{display:flex;flex-direction:column;gap:2rem;padding:1.5rem;background-color:#fff;border-radius:12px;box-shadow:0 4px 6px #0000001a}.stats{display:flex;justify-content:space-around;flex-wrap:wrap;gap:1.5rem;margin-bottom:2rem}.completion-message{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff;padding:1rem 2rem;border-radius:12px;text-align:center;margin:1rem 0;box-shadow:0 4px 12px #22c55e4d;animation:completionPulse 2s ease-in-out infinite alternate}.completion-message p{margin:0;font-size:1.1rem;font-weight:600}@keyframes completionPulse{0%{transform:scale(1);box-shadow:0 4px 12px #22c55e4d}to{transform:scale(1.02);box-shadow:0 6px 20px #22c55e66}}.stat-item{flex:1;min-width:200px;padding:1.5rem;background-color:#f3f4f6;border-radius:8px;text-align:center;transition:transform .2s ease}.stat-item:hover{transform:translateY(-5px)}.stat-value{font-size:3rem;font-weight:700;color:var(--primary-color);margin:.5rem 0}.skill-progress{text-align:center}.skill-buttons{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;margin-top:1.5rem}.skill-button{background-color:var(--accent-color);color:#fff;border:none;padding:1rem 2rem;font-size:1.2rem;font-weight:700;border-radius:12px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 6px #0000001a;min-width:250px}.skill-button:hover{background-color:var(--primary-color);transform:translateY(-2px);box-shadow:0 6px 8px #00000026}.skill-button:active{transform:translateY(0);box-shadow:0 2px 4px #0000001a}.actions{display:flex;justify-content:center;margin-top:1rem}.complete-button{background-color:var(--accent-color);color:#fff;border:none;padding:1rem 2rem;font-size:1.2rem;font-weight:700;border-radius:50px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 6px #0000001a}.complete-button:hover{background-color:var(--primary-color);transform:translateY(-2px);box-shadow:0 6px 8px #00000026}.complete-button:active{transform:translateY(0);box-shadow:0 2px 4px #0000001a}footer{text-align:center;padding:1rem;height:var(--footer-height);display:flex;align-items:center;justify-content:center}.analog-clock-container{display:flex;flex-direction:column;align-items:center;gap:2rem;padding:1.5rem;background-color:#fff;border-radius:12px;box-shadow:0 4px 6px #0000001a}.clock-face{position:relative;width:300px;height:300px;border-radius:50%;background-color:#f3f4f6;border:8px solid var(--primary-color);box-shadow:0 0 15px #0000001a}.clock-center{position:absolute;top:50%;left:50%;width:12px;height:12px;background-color:#333;border-radius:50%;transform:translate(-50%,-50%);z-index:10}.hour-hand,.minute-hand{position:absolute;top:50%;left:50%;transform-origin:center 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p{font-size:1.2rem;margin-bottom:1.5rem}.modal-button{background-color:var(--accent-color);color:#fff;border:none;padding:.8rem 1.5rem;font-size:1.1rem;font-weight:700;border-radius:50px;cursor:pointer;transition:all .3s ease}.modal-button:hover{background-color:var(--primary-color)}@media (min-width: 768px) and (max-width: 1024px){.dashboard,.stat-item{padding:2rem}.complete-button{padding:1.5rem 3rem;font-size:1.5rem}}.button-group{display:flex;justify-content:center;gap:1rem}.number-row{display:flex;justify-content:flex-end;width:100%;margin-bottom:.5rem}.worked-answer.correct .digit{color:var(--text-color)}.worked-answer.incorrect .digit{color:#ef4444}.digit,.operation{width:60px;height:60px;display:flex;justify-content:center;align-items:center;font-size:2rem;font-weight:700}.spacer{width:50px}.separator-line{height:3px;width:100%;background-color:#000;margin:.5rem 0 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#ef4444;background-color:#fee2e2}.clear-button{color:var(--text-color);margin-left:10px;font-size:.8rem;padding:.3rem .6rem;background-color:#f0f0f0;border:1px solid #ccc;border-radius:4px;cursor:pointer;height:30px}.clear-button:hover{background-color:#e0e0e0}@media (pointer: coarse){button{min-height:44px;min-width:44px}.digit-box{width:44px;height:44px}}.dashboard-version-row{font-size:12px;color:#888;margin-top:4px;display:flex;align-items:center;gap:8px}.dashboard-version{cursor:default;transition:color .2s}.dashboard-version-update{cursor:pointer}.dashboard-version-new{color:#e57373}.dashboard-admin-link{color:#aaa;font-size:11px;margin-left:6px;cursor:pointer;border:1px solid #ccc;border-radius:4px;padding:0 4px;transition:background .2s}.dashboard-admin-link:hover{background:#f3f4f6}.dashboard-modal-overlay{background:#0000004d;position:fixed;top:0;left:0;width:100vw;height:100vh;display:flex;align-items:center;justify-content:center;z-index:1000}.dashboard-modal-content{background:#fff;padding:24px;border-radius:8px;min-width:280px;box-shadow:0 2px 16px #00000026;position:relative;display:flex;flex-direction:column;gap:12px}.dashboard-admin-form{display:flex;flex-direction:column;gap:12px}.dashboard-admin-input{margin-left:8px;padding:.5rem 1rem;font-size:1rem;border:1px solid #ccc;border-radius:6px;transition:border-color .2s}.dashboard-admin-input:focus{border-color:var(--primary-color);outline:none}.dashboard-admin-actions{display:flex;gap:8px;justify-content:flex-end}.dashboard-celebration-overlay{background:#ffffffb3;position:fixed;top:0;left:0;width:100vw;height:100vh;display:flex;align-items:center;justify-content:center;z-index:1001;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.dashboard-celebration-content{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;animation:celebrationPulse 2s ease-in-out infinite}.dashboard-celebration-img{width:400px;height:auto;margin-bottom:20px;animation:celebrationBounce 1s ease-in-out infinite}.dashboard-celebration-title{color:#ff6b6b;font-size:2.5rem;font-weight:700;text-shadow:2px 2px 4px rgba(0,0,0,.3);margin:0;animation:celebrationGlow 2s ease-in-out infinite alternate}.dashboard-celebration-msg{color:#666;font-size:1.5rem;margin:10px 0 0;font-weight:500}@keyframes celebrationPulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes celebrationBounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes celebrationGlow{0%{text-shadow:2px 2px 4px rgba(0,0,0,.3)}to{text-shadow:2px 2px 20px rgba(255,107,107,.8)}}.gcf-lcm-worked-solution{display:flex;flex-direction:column;align-items:center;gap:1.5rem;width:100%}.ladder-method{display:inline-flex;flex-direction:column;align-items:flex-start;font-family:monospace;font-size:1.5rem;margin-bottom:1rem;padding:1rem;border-radius:8px;background-color:#f9f9f9;box-shadow:inset 0 1px 3px #0000001a}.ladder-step{display:flex;align-items:center;width:100%}.divisor{width:40px;text-align:right;padding-right:10px;font-weight:700;color:var(--secondary-color);flex-shrink:0}.quotient-pair{display:flex;gap:1.5rem;padding:.5rem 0;flex-grow:1}.quotient-pair.with-lines{border-left:2px solid var(--text-color);border-top:2px solid var(--text-color);padding-left:10px;margin-left:-2px}.quotient-pair span{min-width:40px;text-align:center;display:inline-block}.final-quotients-display .quotient-pair{padding-left:50px;color:#555;font-weight:700}.final-quotients-display .divisor-placeholder{width:40px;height:1.5em;flex-shrink:0}.gcf-lcm-explanation{text-align:center;background-color:#eef2ff;padding:1rem;border-radius:8px;width:100%;max-width:450px;color:var(--text-color)}.gcf-lcm-explanation p{margin:.5rem 0;font-size:1.1rem}.gcf-lcm-explanation strong{color:var(--primary-color);font-size:1.2rem}.number-line-option{display:flex;align-items:center;padding:.75rem 1rem;border:2px solid #e0e0e0;border-radius:8px;cursor:pointer;transition:border-color .3s,background-color .3s}.number-line-option:hover{border-color:var(--accent-color)}.number-line-option.selected{border-color:var(--primary-color);background-color:#eef2ff}.option-label{font-size:1.2rem;font-weight:700;margin-right:1rem;color:var(--text-color);min-width:20px;text-align:center}.number-line-svg-container{flex-grow:1;height:70px}.number-line-svg{width:100%;height:100%;overflow:visible}.number-line-axis{stroke:#334155;stroke-width:1.5}.number-line-tick{stroke:#64748b;stroke-width:1}.number-line-label{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;font-size:13px;fill:var(--text-color);text-anchor:middle}.number-line-point-p-dot{fill:var(--primary-color)}.number-line-point-p-text{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;font-size:14px;font-weight:700;fill:var(--primary-color);text-anchor:middle}.number-line-point-p-arrow{stroke:var(--primary-color);stroke-width:1.5;fill:none}.problem-display-area .whole-number{margin-right:.3em}.problem-display-area .fraction{display:inline-flex;flex-direction:column;align-items:center;line-height:1.1}.problem-display-area .numerator{border-bottom:2px solid var(--text-color);padding-bottom:.1em}.problem-display-area .denominator{padding-top:.1em}.target-number-display{font-size:2.2rem;font-weight:700;color:var(--accent-color);margin-bottom:1rem;background-color:#f8fafc;padding:.5rem 1rem;border-radius:8px;border:1px solid #e2e8f0}.place-value-option{display:flex;align-items:flex-start;padding:.75rem 1rem;border:2px solid #e0e0e0;border-radius:8px;cursor:pointer;transition:border-color .3s,background-color .3s;font-size:1.05rem;line-height:1.5}.place-value-option:hover{border-color:var(--accent-color)}.place-value-option.selected{border-color:var(--primary-color);background-color:#eef2ff}.option-identifier{font-weight:700;margin-right:.75rem;color:var(--text-color);min-width:1.5em}.option-text{flex-grow:1}.solution-paragraph{margin-bottom:1rem;font-size:1.1rem;line-height:1.6}.solution-paragraph code,.option-text code{background-color:#eef2ff;padding:.2em .4em;border-radius:4px;font-family:monospace;font-size:1em;word-break:keep-all}.correct-statement-emphasis{font-weight:700;color:var(--primary-color);background-color:#d1fae5;padding:.3em .5em;border-radius:4px;display:inline-block}.digit-highlight{font-weight:700;color:var(--secondary-color)}.place-name-highlight{font-style:italic;color:var(--accent-color)}.fraction-comparison-display{display:flex;align-items:center;justify-content:center;gap:2rem;margin:2rem 0;padding:1.5rem;background-color:#f8fafc;border-radius:var(--border-radius-lg);border:2px solid #e2e8f0}.fraction-display{display:flex;flex-direction:column;align-items:center}.fraction-display .fraction{display:flex;flex-direction:column;align-items:center;font-size:2.5rem;font-weight:700;color:var(--text-color);line-height:1}.fraction-display .numerator{border-bottom:3px solid var(--text-color);padding:.2rem .5rem;margin-bottom:.1rem}.fraction-display .denominator{padding:.1rem .5rem .2rem}.comparison-symbol{font-size:3rem;font-weight:700;color:var(--primary-color);display:flex;align-items:center;justify-content:center;width:60px;height:60px;background-color:#fff;border:2px solid var(--primary-color);border-radius:50%}.comparison-options{display:flex;gap:1rem;justify-content:center;margin:1.5rem 0}.comparison-button{width:80px;height:80px;font-size:2.5rem;font-weight:700;border:3px solid #ddd;border-radius:var(--border-radius-md);background-color:#fff;color:var(--text-color);cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center}.comparison-button:hover{border-color:var(--primary-color);background-color:#f3f4f6;transform:translateY(-2px);box-shadow:0 4px 8px #0000001a}.comparison-button.selected{border-color:var(--primary-color);background-color:var(--primary-color);color:#fff;box-shadow:0 4px 8px #4f46e54d}.comparison-button:active{transform:translateY(0)}@media (max-width: 768px){.fraction-comparison-display{gap:1rem;padding:1rem}.fraction-display .fraction{font-size:2rem}.comparison-symbol{font-size:2.5rem;width:50px;height:50px}.comparison-button{width:60px;height:60px;font-size:2rem}.comparison-options{gap:.5rem}}@media (max-width: 480px){.fraction-comparison-display{flex-direction:column;gap:1rem}.comparison-symbol{transform:rotate(90deg)}}.mixed-fractions-problem{display:flex;align-items:center;justify-content:center;gap:var(--spacing-lg);padding:var(--spacing-lg);border-radius:var(--border-radius-lg);border:1px solid #e2e8f0;background-color:#f8fafc;flex-wrap:wrap}.mixed-fraction{display:inline-flex;align-items:center;gap:var(--spacing-sm);font-size:2rem;color:var(--text-color);font-weight:600}.mixed-fraction .whole-number{font-size:2.2rem;font-weight:700}.mixed-fraction .fraction{display:inline-flex;flex-direction:column;align-items:center;line-height:1.1}.mixed-fraction .numerator{border-bottom:3px solid var(--text-color);padding:.2rem .5rem}.mixed-fraction .denominator{padding:.1rem .5rem}.operator-symbol{font-size:2.5rem;font-weight:700;color:var(--primary-color)}.mixed-instruction{text-align:center;margin-bottom:var(--spacing-md);color:var(--text-color)}.mixed-fraction-form{width:100%;max-width:360px}.mixed-fraction-form .button-group{width:100%}.mixed-fraction-inline{display:inline-flex;align-items:center;gap:.35rem}.mixed-fraction-inline .fraction-inline{display:inline-flex;flex-direction:column;align-items:center;line-height:1}@media (max-width: 600px){.mixed-fractions-problem{gap:var(--spacing-md);padding:var(--spacing-md)}.mixed-fraction{font-size:1.6rem}.mixed-fraction .whole-number{font-size:1.8rem}.operator-symbol{font-size:2rem}}.long-division-display{font-family:monospace;font-size:1.5rem;line-height:1.4;display:inline-flex;align-items:flex-start;padding:1.5rem;background-color:#f8fafc;border:1px solid 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