:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:#ffffffde;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#242424;font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;font-weight:400;line-height:1.5}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}body{place-items:center;min-width:320px;min-height:100vh;margin:0;display:flex}#root{width:100%}@media (prefers-color-scheme:light){:root{color:#213547;background-color:#fff}}:root{--primary-color:#4a90e2;--primary-dark:#357abd;--secondary-color:#f5a623;--secondary-dark:#d48c1a;--bg-color:#f0f4f8;--text-color:#2c3e50;--white:#fff;--border-radius:12px;--shadow:0 4px 6px #0000001a;--shadow-lg:0 10px 25px #0000001a}body{background-color:var(--bg-color);color:var(--text-color);margin:0;padding:0;font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.5}.container{max-width:1000px;margin:0 auto;padding:0 24px}.header{background:var(--white);text-align:center;border-bottom:1px solid #e1e8ed;padding:32px 0;box-shadow:0 1px 3px #0000001a}.logo{justify-content:center;align-items:center;gap:12px;display:flex}.logo h1{letter-spacing:-.5px;background:linear-gradient(135deg, var(--primary-color), #6366f1);-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin:0;font-size:2.5rem;font-weight:800}.header p{color:#64748b;margin:8px 0 0;font-size:1.1rem;font-weight:500}.controls{padding:40px 0}.control-group{background:var(--white);border-radius:var(--border-radius);box-shadow:var(--shadow);margin-bottom:24px;padding:24px}.control-group label{text-transform:uppercase;letter-spacing:.5px;color:#64748b;margin-bottom:16px;font-size:1rem;font-weight:700;display:block}.button-grid{flex-wrap:wrap;gap:8px;display:flex}.button-grid button{color:#475569;cursor:pointer;background:#f1f5f9;border:2px solid #0000;border-radius:8px;padding:8px 16px;font-size:.9rem;font-weight:600;transition:all .2s}.button-grid button:hover{background:#e2e8f0}.button-grid button.active{background:var(--primary-color);color:var(--white);box-shadow:0 4px 8px #4a90e233}.control-row{align-items:stretch;gap:20px;margin-bottom:24px;display:flex}.control-row .control-group{flex:1;margin-bottom:0}input[type=range]{width:100%;accent-color:var(--primary-color);cursor:pointer}.checkbox-group .checkbox-label{cursor:pointer;color:#334155;justify-content:center;align-items:center;gap:12px;height:100%;font-size:1rem;font-weight:600;display:flex}.checkbox-group input[type=checkbox]{width:20px;height:20px;accent-color:var(--primary-color)}.action-buttons{justify-content:center;gap:16px;display:flex}.btn-primary,.btn-secondary,.btn-download{cursor:pointer;border:none;border-radius:30px;justify-content:center;align-items:center;gap:10px;padding:12px 24px;font-size:1rem;font-weight:700;transition:all .2s;display:flex}.btn-primary{background:linear-gradient(135deg, var(--primary-color), #6366f1);color:var(--white)}.btn-secondary{background:linear-gradient(135deg, var(--secondary-color), #fbbf24);color:var(--white)}.btn-download{color:var(--white);background:linear-gradient(135deg,#10b981,#059669)}.equation-grid{grid-template-columns:repeat(2,1fr);gap:24px 60px;display:grid}.emoji-icon{margin:0 4px;font-size:2rem}.icon-group,.pattern-group{background:#fff;border:1px dashed #cbd5e1;border-radius:8px;flex-wrap:wrap;align-items:center;gap:8px;margin:8px 0;padding:8px 16px;display:inline-flex}.pattern-placeholder{color:var(--primary-color);margin-left:8px;font-weight:800}.equation-card{background:#f8fafc;border-radius:8px;align-items:center;gap:12px;min-height:80px;padding:16px;font-size:1.6rem;display:flex}.question{flex-wrap:wrap;flex:1;align-items:center;gap:12px;display:flex}.fraction{vertical-align:middle;flex-direction:column;align-items:center;margin:0 4px;font-size:.9em;display:inline-flex}.numerator{border-bottom:2px solid;padding:0 4px}.denominator{padding:0 4px}.worksheet-preview{background:var(--white);box-shadow:var(--shadow-lg);border-radius:var(--border-radius);margin-bottom:60px;padding:60px}.worksheet-header{border-bottom:3px solid #1e293b;justify-content:space-between;margin-bottom:40px;padding-bottom:24px;display:flex}.student-info div{margin-bottom:12px;font-size:1.2rem;font-weight:600}.title-info h2{margin:0;font-size:2rem;font-weight:800;line-height:1.2}.answer-box{border-bottom:2px solid #334155;flex-shrink:0;width:80px;height:30px;margin-left:auto;display:inline-block}.answer-key{border-radius:var(--border-radius);background:#fffbeb;border:2px dashed #fcd34d;margin-top:60px;padding:32px}.answer-grid{grid-template-columns:repeat(4,1fr);gap:16px;display:grid}.answer-item{background:#fff;border-radius:6px;padding:8px}.answer-item .answer{color:#ef4444;margin-left:8px;font-weight:800}@media print{.no-print{display:none!important}.worksheet-preview{box-shadow:none;padding:0}.equation-grid{grid-template-columns:1fr 1fr!important;gap:20px 40px!important;display:grid!important}.equation-card{break-inside:avoid;background:0 0!important;border:1px solid #eee!important}.worksheet{page-break-after:always}.page-break-before{page-break-before:always}}@media (width<=768px){.control-row,.action-buttons{flex-direction:column}.equation-grid{grid-template-columns:1fr}.answer-grid{grid-template-columns:repeat(2,1fr)}.worksheet-preview{padding:20px}.worksheet-header{text-align:left;flex-direction:column;align-items:flex-start;gap:16px}.title-info{text-align:left;width:100%}.title-info h2{font-size:1.5rem}.student-info div{font-size:1rem}}