@import"https://fonts.googleapis.com/css2?family=Fredoka:wght@500;600;700&family=Nunito:wght@400;600;700;800;900&family=Quicksand:wght@500;600;700&display=swap";:root{--primary: #3b82f6;--primary-hover: #2563eb;--accent: #f59e0b;--success: #10b981;--bg-app: #f1f5f9;--panel-bg: #ffffff;--text-main: #1e293b;--text-muted: #64748b;--border-ui: #e2e8f0;--radius-lg: 16px;--radius-md: 10px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Nunito,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--bg-app);color:var(--text-main);min-height:100vh;display:flex;flex-direction:column}.top-nav{background:#fff;border-bottom:1px solid var(--border-ui);padding:.75rem 1.5rem;position:sticky;top:0;z-index:100}.nav-container{max-width:1400px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.nav-logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-size:1.15rem;font-weight:800;color:#1e293b}.nav-logo img{width:32px;height:32px;border-radius:8px}.nav-badge{background:#e0f2fe;color:#0284c7;font-size:.75rem;padding:2px 8px;border-radius:12px;font-weight:700}.nav-links{display:flex;gap:16px}.nav-link{color:var(--text-muted);text-decoration:none;font-size:.875rem;transition:color .2s}.nav-link:hover{color:var(--primary)}.app-layout{display:flex;flex:1;max-width:1400px;margin:1.5rem auto;padding:0 1.5rem;gap:2rem;align-items:flex-start;width:100%}.controls-panel{width:360px;background:var(--panel-bg);border:1px solid var(--border-ui);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:0 4px 20px -2px #0000000d;display:flex;flex-direction:column;gap:1.25rem;flex-shrink:0}.panel-header h1,.panel-header h2{font-family:Fredoka,cursive,sans-serif;font-size:1.35rem;color:#0f172a;display:flex;align-items:center;gap:8px;margin:0}.panel-header 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#0f172a;border-radius:10px;display:flex;align-items:center;justify-content:center;font-family:Fredoka,cursive,sans-serif;font-size:1.5rem;font-weight:700;color:#0f172a;background:#fff;-webkit-user-select:none;user-select:none}.slider-header{display:flex;align-items:center;justify-content:space-between}.slider-container{display:flex;flex-direction:column;gap:2px;padding:4px 2px}.range-slider{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:8px;border-radius:4px;background:#e2e8f0;outline:none;transition:background .2s;cursor:pointer}.range-slider:hover{background:#cbd5e1}.range-slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:22px;height:22px;border-radius:50%;background:#3b82f6;border:3px solid #ffffff;box-shadow:0 2px 6px #2563eb59;cursor:pointer;transition:transform .15s,background-color .15s}.range-slider::-webkit-slider-thumb:hover,.range-slider:active::-webkit-slider-thumb{transform:scale(1.15);background:#2563eb}.range-slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:#3b82f6;border:3px solid #ffffff;box-shadow:0 2px 6px #2563eb59;cursor:pointer}.slider-thumb-track{position:relative;width:100%;height:26px;margin-top:2px}.slider-value-bubble{position:absolute;top:2px;transform:translate(-50%);background:#2563eb;color:#fff;font-family:Fredoka,cursive,sans-serif;font-size:.88rem;font-weight:700;padding:2px 9px;border-radius:10px;box-shadow:0 2px 8px #2563eb59;pointer-events:none;-webkit-user-select:none;user-select:none;line-height:1.2;white-space:nowrap}.slider-value-bubble:before{content:"";position:absolute;top:-4px;left:50%;transform:translate(-50%);border-width:0 4px 4px 4px;border-style:solid;border-color:transparent transparent #2563eb 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8px}.btn-secondary:hover{background:#e2e8f0;color:#0f172a}.preview-container{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;gap:1rem;padding-bottom:2rem;width:100%}.paper-sheet-wrapper{width:100%;max-width:794px;display:flex;justify-content:center}.worksheet-paper{width:100%;max-width:794px;height:auto;background:#fff;border-radius:4px;box-shadow:0 10px 35px -5px #0000001f,0 0 2px 1px #0000000d;position:relative;overflow:hidden;box-sizing:border-box}.worksheet-canvas{width:100%;height:auto;display:block;border-radius:4px}.sheet-header{position:relative;text-align:center;margin-bottom:12px;padding:0 16px}.header-cloud{position:absolute;left:8px;top:-10px}.header-apple{position:absolute;right:12px;top:-8px}.sheet-title{font-family:Fredoka,cursive,sans-serif;font-size:2.35rem;font-weight:700;letter-spacing:.5px;line-height:1.15;color:#1e293b;margin-bottom:16px}.sheet-title .word-my{color:#0f172a}.sheet-title .word-super{color:#84cc16}.sheet-title .word-fun{color:#f97316}.sheet-title .word-add{color:#0f172a}.sheet-title .word-sub{color:#ec4899}.sheet-title .word-math{color:#3b82f6}.sheet-meta-bar{display:flex;justify-content:space-between;align-items:center;font-family:Fredoka,cursive,sans-serif;font-size:1.15rem;font-weight:600;color:#0f172a;padding:0 8px;margin-bottom:16px}.meta-field{display:flex;align-items:baseline;gap:8px}.meta-line{display:inline-block;border-bottom:2px dashed #334155;min-width:190px;height:20px;text-align:center;font-family:Quicksand,sans-serif;font-size:1.05rem;font-weight:700;color:#1e293b}.meta-line.short{min-width:140px}.sheet-columns-grid{display:grid;grid-template-columns:1fr 1fr;position:relative;flex:1;margin-top:4px}.sheet-columns-grid:after{content:"";position:absolute;top:0;bottom:10px;left:50%;width:2px;background:#1e293b;transform:translate(-50%)}.sheet-column{padding:4px 20px 0;display:flex;flex-direction:column}.problems-list{display:flex;flex-direction:column;justify-content:space-between;flex:1;gap:10px}.problem-card{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4px 0;width:100%}.visual-equation-grid{display:grid;align-items:center;justify-items:center;justify-content:center;row-gap:6px;column-gap:8px;width:100%}.visual-equation-grid.cols-5{grid-template-columns:auto auto auto auto auto}.visual-equation-grid.cols-3{grid-template-columns:auto auto auto}.grid-cell{display:flex;align-items:center;justify-content:center}.item-icons-left,.item-icons-right{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:3px;max-width:115px;min-width:42px;min-height:44px}.item-op-top{font-family:Fredoka,cursive,sans-serif;font-size:1.85rem;font-weight:800;color:#0f172a;line-height:1;min-height:44px;display:flex;align-items:center;justify-content:center;padding:0 2px}.item-empty{min-height:44px;width:100%}.calc-box{width:38px;height:38px;border:2.2px solid #0f172a;border-radius:9px;display:flex;align-items:center;justify-content:center;font-family:Fredoka,cursive,sans-serif;font-size:1.35rem;font-weight:700;color:#0f172a;background:#fff;-webkit-user-select:none;user-select:none}.calc-box.prefilled{color:#0f172a;background:#f8fafc}.box-symbol{font-family:Fredoka,cursive,sans-serif;font-size:1.4rem;font-weight:800;color:#0f172a;width:24px;height:38px;display:flex;align-items:center;justify-content:center}.equation-drill-card{display:flex;align-items:center;justify-content:center;gap:10px;padding:10px 14px;background:#f8fafc;border:1.5px solid #e2e8f0;border-radius:12px;width:100%}.drill-item-badge{display:flex;align-items:center;margin-right:4px}.drill-num{font-family:Fredoka,cursive,sans-serif;font-size:1.5rem;font-weight:700;color:#0f172a}@media print{@page{size:A4 portrait;margin:0}html,body{background:#fff!important;margin:0!important;padding:0!important;width:100%!important;height:100%!important;overflow:visible!important}.top-nav,.controls-panel,.seo-guide-section,.site-footer,.footer-notice{display:none!important}.app-layout{display:block!important;padding:0!important;margin:0!important;max-width:none!important}.preview-container{padding:0!important;margin:0!important;overflow:visible!important}.paper-sheet-wrapper{margin:0!important;padding:0!important}.worksheet-paper{width:210mm!important;min-height:297mm!important;height:297mm!important;box-shadow:none!important;border-radius:0!important;margin:0 auto!important;padding:0!important;page-break-inside:avoid!important;page-break-after:avoid!important;-webkit-print-color-adjust:exact!important;print-color-adjust:exact!important}.worksheet-canvas{width:210mm!important;height:297mm!important;display:block!important}}@media(max-width:1100px){.app-layout{flex-direction:column;align-items:center;padding:0 1rem;gap:1.5rem}.controls-panel{width:100%;max-width:794px}.preview-container{width:100%}}.seo-guide-section{background:#fff;border-top:1px solid var(--border-ui);padding:3.5rem 1.5rem;margin-top:2rem}.seo-container{max-width:1100px;margin:0 auto;display:flex;flex-direction:column;gap:3rem}.seo-intro{text-align:center;max-width:820px;margin:0 auto}.seo-intro h2{font-family:Fredoka,cursive,sans-serif;font-size:2rem;color:#0f172a;margin-bottom:1rem;line-height:1.3}.seo-intro p{font-size:1.05rem;line-height:1.7;color:#475569}.seo-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.5rem}.seo-feature-card{background:#f8fafc;border:1px solid var(--border-ui);border-radius:var(--radius-lg);padding:1.75rem;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}.seo-feature-card:hover{transform:translateY(-3px);box-shadow:0 10px 25px -5px #0000000f;border-color:#cbd5e1}.feature-icon{font-size:2.2rem;margin-bottom:1rem}.seo-feature-card h3{font-family:Fredoka,cursive,sans-serif;font-size:1.2rem;color:#1e293b;margin-bottom:.5rem}.seo-feature-card p{font-size:.92rem;line-height:1.6;color:#64748b}.seo-steps-section{text-align:center}.seo-steps-section h2{font-family:Fredoka,cursive,sans-serif;font-size:1.8rem;color:#0f172a;margin-bottom:2rem}.seo-steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.5rem;text-align:left}.seo-step-card{background:#fff;border:2px dashed #e2e8f0;border-radius:var(--radius-lg);padding:1.75rem;position:relative}.step-badge{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:#eff6ff;color:var(--primary);font-weight:800;font-size:1.1rem;margin-bottom:1rem}.seo-step-card h3{font-family:Fredoka,cursive,sans-serif;font-size:1.15rem;color:#1e293b;margin-bottom:.5rem}.seo-step-card p{font-size:.92rem;line-height:1.6;color:#64748b}.seo-faq-section{max-width:860px;margin:0 auto;width:100%}.seo-faq-section h2{font-family:Fredoka,cursive,sans-serif;font-size:1.8rem;color:#0f172a;margin-bottom:1.5rem;text-align:center}.seo-faq-list{display:flex;flex-direction:column;gap:1rem}.faq-item{background:#f8fafc;border:1px solid var(--border-ui);border-radius:var(--radius-md);overflow:hidden;transition:border-color .2s}.faq-item[open]{border-color:#93c5fd;background:#fff}.faq-question{padding:1.1rem 1.25rem;font-size:1.05rem;font-weight:700;color:#1e293b;cursor:pointer;display:flex;justify-content:space-between;align-items:center;-webkit-user-select:none;user-select:none;list-style:none}.faq-question::-webkit-details-marker{display:none}.faq-arrow{font-size:1.1rem;color:var(--primary);transition:transform .2s ease}.faq-item[open] .faq-arrow{transform:rotate(180deg)}.faq-answer{padding:0 1.25rem 1.25rem;font-size:.95rem;line-height:1.65;color:#475569}.seo-related-tools{background:#f1f5f9;border-radius:var(--radius-lg);padding:2rem;text-align:center}.seo-related-tools h3{font-family:Fredoka,cursive,sans-serif;font-size:1.25rem;color:#1e293b;margin-bottom:1rem}.tools-links{display:flex;flex-wrap:wrap;gap:.75rem;justify-content:center}.tool-chip{background:#fff;border:1px solid var(--border-ui);padding:.55rem 1rem;border-radius:20px;color:#334155;text-decoration:none;font-size:.88rem;font-weight:600;transition:all .2s ease}.tool-chip:hover{background:var(--primary);color:#fff;border-color:var(--primary);transform:translateY(-2px);box-shadow:0 4px 12px #3b82f640}.site-footer{background:#0f172a;color:#94a3b8;padding:2.5rem 1.5rem;margin-top:auto}.footer-container{max-width:1100px;margin:0 auto;display:flex;flex-direction:column;align-items:center;gap:1.25rem;text-align:center}.footer-brand{font-size:.95rem;color:#cbd5e1}.footer-brand strong{color:#fff;font-weight:700}.footer-links{display:flex;gap:1.5rem;flex-wrap:wrap;justify-content:center}.footer-links a{color:#94a3b8;text-decoration:none;font-size:.88rem;transition:color .2s}.footer-links a:hover{color:#fff}.footer-copyright{font-size:.8rem;color:#64748b}@media(max-width:640px){.seo-intro h2{font-size:1.5rem}.seo-features-grid,.seo-steps-grid{grid-template-columns:1fr}}