:root{--bg-page: #121214;--bg-surface: #1e1e22;--bg-surface-secondary: #27272b;--bg-toolbar: #18181c;--border-color: #323238;--border-subtle: #27272b;--text-main: #f4f4f6;--text-muted: #a1a1aa;--text-dim: #71717a;--accent-green: #10b981;--accent-blue: #3b82f6;--accent-amber: #f59e0b;--accent-rose: #ef4444;--grid-border: #2e2e34;--grid-header-bg: #222227;--grid-header-text: #a1a1aa;--grid-cell-bg: #18181c;--grid-cell-hover: #232329;--grid-row-idx-bg: #1f1f24;--input-bg: #121214;--input-border: #3f3f46;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;--radius: 6px}[data-theme=light]{--bg-page: #f8f9fa;--bg-surface: #ffffff;--bg-surface-secondary: #f1f3f5;--bg-toolbar: #f8f9fa;--border-color: #e2e8f0;--border-subtle: #cbd5e1;--text-main: #111827;--text-muted: #4b5563;--text-dim: #9ca3af;--grid-border: #e2e8f0;--grid-header-bg: #f1f5f9;--grid-header-text: #475569;--grid-cell-bg: #ffffff;--grid-cell-hover: #f8fafc;--grid-row-idx-bg: #f8fafc;--input-bg: #ffffff;--input-border: #cbd5e1}*{margin:0;padding:0;box-sizing:border-box}body{background-color:var(--bg-page);color:var(--text-main);font-family:var(--font-sans);min-height:100vh;line-height:1.45;-webkit-font-smoothing:antialiased;overflow-x:hidden}.app-container{width:100%;max-width:100vw;min-height:100vh;display:flex;flex-direction:column}.compact-navbar{height:52px;background:var(--bg-surface);border-bottom:1px solid var(--border-color);padding:0 16px;display:flex;align-items:center;justify-content:space-between;gap:16px;position:sticky;top:0;z-index:100;box-shadow:0 1px 3px #0000001a}.nav-left{display:flex;align-items:center;gap:12px}.sheet-logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:.95rem;color:var(--text-main);letter-spacing:-.01em}.status-dot{width:8px;height:8px;border-radius:50%;background:var(--accent-green);box-shadow:0 0 6px 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ease;white-space:nowrap}.btn:hover:not(:disabled){background:var(--border-color);color:var(--text-main)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--accent-green);border-color:var(--accent-green);color:#fff!important}.btn-primary:hover:not(:disabled){opacity:.92;background:var(--accent-green)}.btn-action-indigo{background:#4f46e5;border-color:#4f46e5;color:#fff!important}.btn-action-indigo:hover:not(:disabled){background:#4338ca}.btn-danger{background:#ef44441f;border-color:#ef44444d;color:var(--accent-rose)}.btn-danger:hover:not(:disabled){background:var(--accent-rose);color:#fff}.btn-icon{padding:6px}.user-identity-pill{display:flex;align-items:center;gap:8px;padding:4px 10px;border-radius:999px;background:var(--bg-surface-secondary);border:1px solid var(--border-color);font-size:.8rem;font-weight:600}.user-avatar-badge{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff}.spreadsheet-container{display:flex;flex-direction:column;flex:1;padding:12px 16px 24px;gap:12px}.excel-ribbon-bar{display:flex;align-items:center;flex-wrap:wrap;gap:12px;background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius);padding:6px 12px;box-shadow:0 1px 2px #0000000a}.ribbon-group{display:flex;flex-direction:column;gap:2px;padding-right:12px;border-right:1px solid var(--border-color)}.ribbon-group:last-child,.ribbon-group.ribbon-group-right{border-right:none;padding-right:0;margin-left:auto}.ribbon-group-label{font-size:.68rem;font-weight:600;color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em;-webkit-user-select:none;user-select:none}.ribbon-control-row{display:flex;align-items:center;gap:6px}.excel-type-select{height:28px;padding:2px 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var(--grid-border);-webkit-user-select:none;user-select:none;min-width:60px;position:relative}.col-resize-handle{position:absolute;top:0;right:-3px;width:7px;height:100%;cursor:col-resize;z-index:20;-webkit-user-select:none;user-select:none;touch-action:none}.col-resize-handle:hover,.col-resize-handle.is-resizing{background-color:var(--accent-blue, #3b82f6);opacity:.85}.excel-table th.col-header-add-cell{background:var(--grid-header-bg);color:var(--text-dim);font-weight:700;font-size:1.1rem;text-align:center;padding:6px 12px;border-right:1px solid var(--grid-border);border-bottom:1px solid var(--grid-border);-webkit-user-select:none;user-select:none;width:48px;min-width:48px;cursor:pointer;transition:all .15s ease}.excel-table th.col-header-add-cell:hover{background:var(--bg-surface-secondary);color:var(--accent-green)}.excel-table td.row-header-cell{background:var(--grid-row-idx-bg);color:var(--grid-header-text);text-align:center;font-size:.75rem;font-family:var(--font-mono);font-weight:600;border-right:1px solid var(--grid-border);border-bottom:1px solid var(--grid-border);-webkit-user-select:none;user-select:none;width:52px;position:relative}.row-resize-handle{position:absolute;bottom:-3px;left:0;width:100%;height:7px;cursor:row-resize;z-index:20;-webkit-user-select:none;user-select:none;touch-action:none}.row-resize-handle:hover,.row-resize-handle.is-resizing{background-color:var(--accent-blue, #3b82f6);opacity:.85}.excel-table td.data-cell{background:var(--grid-cell-bg);color:var(--text-main);padding:8px 12px;border-right:1px solid var(--grid-border);border-bottom:1px solid var(--grid-border);position:relative;transition:background .12s ease;word-break:break-word}.live-typing-cursor{display:inline-block;font-weight:700;margin-left:2px;animation:blinkTypingCursor .75s infinite}@keyframes 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