:root{--primary: #1e3a8a;--accent: #2563eb;--accent-hover: #1d4ed8;--tutor-ink: #1d4ed8;--tutor-work: #1e40af;--tutor-carry: #dc2626;--bg-panel: #f8fafc;--grid-line: #cbd5e1;--cell-w: 16.5px;--cell-h: 20px;--cell-font: 14px}*{box-sizing:border-box;-webkit-print-color-adjust:exact;print-color-adjust:exact}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Arial,sans-serif;margin:0;padding:0;background-color:#f1f5f9;color:#0f172a}.controls-panel{max-width:1040px;margin:20px auto;background:#fff;padding:24px;border-radius:14px;box-shadow:0 4px 20px #00000014;transition:all .2s ease-in-out}body.preview-mode #appMain,body:has(#appMain.collapsed) #appMain,.controls-panel.collapsed{display:none!important}body.preview-mode .seo-guide-container,body.preview-mode .app-footer,body:has(#appMain.collapsed) .seo-guide-container,body:has(#appMain.collapsed) .app-footer{display:none!important}.controls-panel 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14px!important;font-size:13px!important;border-radius:20px!important}.sticky-page-badge{color:#e2e8f0;font-size:12px;font-weight:700;padding:0 6px;white-space:nowrap}@media (max-width: 650px){.sticky-action-bar{bottom:12px;width:95%;border-radius:14px;padding:8px 10px}.sticky-bar-inner{justify-content:space-between;width:100%}.sticky-page-badge{display:none}}.sheet-wrapper{display:flex;flex-direction:column;align-items:center;gap:20px;margin-bottom:30px}.a4-page{width:210mm;height:296mm;max-height:296mm;padding:8mm 9mm;background:#fff;box-shadow:0 4px 16px #0000001a;position:relative;display:flex;flex-direction:column;overflow:hidden}.sheet-header{border-bottom:2px solid #334155;padding-bottom:3px;margin-bottom:6px;display:flex;justify-content:space-between;align-items:flex-end;flex-shrink:0}.sheet-header h2{font-size:13.5px;margin:0;color:var(--primary);text-transform:uppercase;letter-spacing:.5px;cursor:pointer;border-radius:4px;padding:1px 4px;transition:background 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14.5px}.layout-9{grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);gap:8px;--cell-w: 21px;--cell-h: 26px;--cell-font: 15.5px}.layout-8{grid-template-columns:repeat(2,1fr);grid-template-rows:repeat(4,1fr);gap:8px;--cell-w: 22px;--cell-h: 25px;--cell-font: 16px}.layout-6{grid-template-columns:repeat(2,1fr);grid-template-rows:repeat(3,1fr);gap:10px;--cell-w: 23px;--cell-h: 28px;--cell-font: 17px}.exercise-box{border:1px solid #cbd5e1;border-radius:5px;padding:3px 4px;position:relative;background:#fff;display:flex;flex-direction:column;overflow:hidden}.exercise-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:2px;position:relative;z-index:3;flex-shrink:0}.exercise-num{font-size:11px;font-weight:900;color:#0f172a}.exercise-type-pill{font-size:9px;font-weight:700;padding:1px 4px;border-radius:3px}.math-workspace{flex-grow:1;display:flex;justify-content:center;align-items:flex-start;width:100%;padding-top:1px;overflow:hidden}.c-grid{display:inline-flex;flex-direction:column;border-top:1px dotted var(--grid-line);border-left:1px dotted var(--grid-line);background:#fff}.no-grid .c-grid{border-top:1px solid transparent;border-left:1px solid transparent}.c-row{display:flex;height:var(--cell-h)}.c-cell{width:var(--cell-w);height:var(--cell-h);border-right:1px dotted var(--grid-line);border-bottom:1px dotted var(--grid-line);display:flex;align-items:center;justify-content:center;font-family:Courier New,Courier,Consolas,Monaco,monospace;font-size:var(--cell-font);font-weight:700;color:#0f172a;box-sizing:border-box;user-select:none}.no-grid .c-cell{border-right:1px solid transparent;border-bottom:1px solid transparent}.c-cell.c-op-sign{color:#334155;font-weight:900}.c-cell.c-carry{font-size:10px;color:var(--tutor-carry);font-weight:800}.c-cell.c-res-tutor{color:var(--tutor-ink);font-weight:900}.c-cell.c-work-tutor{color:var(--tutor-work)}.c-op-line{height:2px;background:#0f172a;width:100%;flex-shrink:0}.division-workspace{display:inline-flex;align-items:flex-start;margin:auto}.div-left-side,.div-right-side{display:flex;flex-direction:column}.div-bracket{border-left:2px solid #0f172a;border-bottom:2px solid #0f172a}.div-quotient-row{border-left:2px solid #0f172a}.sqrt-workspace{display:inline-flex;align-items:flex-start;margin:auto}.sqrt-left-side{display:flex;flex-direction:column;padding-right:2px}.sqrt-right-side{border-left:2px solid #0f172a;display:flex;flex-direction:column}.sqrt-root-box{border-bottom:2px solid #0f172a}.seo-guide-container{max-width:1040px;margin:40px auto 20px;background:#fff;padding:32px 28px;border-radius:14px;box-shadow:0 4px 20px 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