@import "https://fonts.googleapis.com/css2?family=Segoe+UI:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap";:root{--font-sans:"Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, sans-serif;--font-mono:"JetBrains Mono", ui-monospace, monospace;--bg-app:#f3f2f1;--bg-card:#fff;--bg-header:#107c41;--bg-sidebar:#faf9f8;--bg-input:#fff;--border-color:#edebe9;--border-light:#f3f2f1;--color-primary:#107c41;--color-primary-hover:#0b592e;--color-primary-light:#eff6fc;--text-main:#323130;--text-muted:#605e5c;--text-dark:#201f1e;--color-success:#107c41;--color-success-bg:#dfefe6;--color-warning:#a80000;--color-warning-bg:#fde7e9;--color-danger:#a80000;--color-danger-bg:#fde7e9;--color-info:#0078d4;--color-info-bg:#eff6fc;--shadow-sm:0 1px 2px #0000000a;--shadow-md:0 2px 8px #0000000f;--shadow-lg:0 8px 24px #00000014;--shadow-premium:0 4px 20px #0000000f;--shadow-glow:0 0 12px #107c4126;--radius-sm:4px;--radius-md:6px;--radius-lg:8px;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-normal:.25s cubic-bezier(.4, 0, .2, 1);--transition-premium:.3s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-app);color:var(--text-main);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;height:100vh;line-height:1.5;overflow:hidden}#root{flex-direction:column;width:100vw;max-width:100%;height:100vh;display:flex}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:#c1c1c1;border:2px solid #f1f1f1;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#a8a8a8}code{font-family:var(--font-mono);color:#a80000;background:#f3f2f1;border:1px solid #d1d1d1;border-radius:2px;padding:1px 5px;font-size:12px;display:inline-block}h1{color:#fff;margin:0;font-size:18px;font-weight:600}h2{color:var(--text-main);margin:0 0 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var(--transition-normal);flex-direction:column;flex-shrink:0;display:flex;overflow:hidden}.app-sidebar.collapsed{border-right-color:#0000;width:0}.sidebar-inner{flex-direction:column;flex-shrink:0;width:250px;height:100%;display:flex;overflow:hidden}.sidebar-title{border-bottom:1px solid var(--border-color);color:var(--text-main);background-color:#f8f9fa;align-items:center;gap:8px;padding:12px 16px;display:flex}.sidebar-title h2{text-transform:uppercase;letter-spacing:.5px;font-size:13px;font-weight:600}.sidebar-lessons-list{flex:1;padding:12px;overflow-y:auto}.level-group{margin-bottom:16px}.level-group-title{text-transform:uppercase;color:var(--text-muted);border-bottom:1px solid #f3f2f1;margin-bottom:6px;padding:0 4px 4px;font-size:10px;font-weight:600}.level-lessons{flex-direction:column;gap:2px;display:flex}.lesson-item-btn{border-radius:0 var(--radius-sm) var(--radius-sm) 0;text-align:left;cursor:pointer;width:100%;color:var(--text-main);transition:all 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#107c41!important}.grid-cell{color:var(--text-main);cursor:cell;background-color:#fff;outline:none;position:relative}.grid-cell:hover{background-color:#f8f9fa}.grid-cell.selected{outline-offset:-2px;z-index:2;background-color:#107c410a;outline:2px solid #107c41!important}.grid-cell.selected:after{content:"";z-index:10;cursor:crosshair;background-color:#107c41;border:1px solid #fff;width:5px;height:5px;position:absolute;bottom:-3px;right:-3px}.grid-cell.editing{z-index:4;background-color:#fff}.cell-value-render{text-overflow:ellipsis;white-space:nowrap;width:100%;height:100%;padding:2px 6px;line-height:18px;display:block;overflow:hidden}.excel-border-all{border:1px solid #333!important}.excel-border-bottom-double{border-bottom:3px double #333!important}.cell-editor-input{width:100%;height:100%;color:var(--text-main);font-family:var(--font-sans);background:#fff;border:none;outline:none;padding:0 5px;font-size:12px;box-shadow:inset 0 1px 2px #0000001a}.sheets{border-top:1px solid 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