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ease}.chart-dataset-add-btn:hover{border-color:var(--border-strong);background:var(--surface);color:var(--text-primary)}.chart-dataset-table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:8px}.chart-spreadsheet{width:100%;border-collapse:collapse;font-size:12px}.chart-spreadsheet td,.chart-spreadsheet th{padding:4px 6px;border:1px solid var(--border);background:var(--surface)}.chart-td-idx,.chart-th-idx{width:32px;text-align:center;color:var(--text-tertiary);font-size:11px}.chart-td-idx,.chart-th-header,.chart-th-idx{background:var(--surface-subtle)!important}.chart-th-content{display:flex;align-items:center;gap:4px}.chart-th-input{width:100%;height:28px;padding:0 6px;border:1px solid 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var(--border-strong)}.chart-td-del,.chart-th-actions{width:32px;text-align:center}.chart-preview-card{position:-webkit-sticky;position:sticky;top:0;display:flex;flex-direction:column;gap:12px;padding:16px;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,.02)}.chart-preview-header{display:flex;align-items:center;justify-content:space-between}.chart-preview-title{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:var(--text-primary)}.chart-preview-title .sparkle-icon{color:#eab308}.chart-preview-pill{font-size:11px;color:var(--text-secondary);background:var(--surface-hover);padding:2px 8px;border-radius:999px}.chart-preview-canvas-container{min-height:280px;padding:8px;background:var(--surface);border:1px dashed var(--border);border-radius:8px}.chart-surface-frame-preview{width:100%}.chart-preview-footer{font-size:11px;color:var(--text-tertiary);text-align:center}.chart-modal-footer{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:var(--surface);border-top:1px solid var(--border)}.chart-modal-footer-tip{font-size:11px;color:var(--text-tertiary)}.chart-modal-actions{display:flex;align-items:center;gap:10px}.chart-btn-secondary{height:36px;padding:0 16px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text-secondary);font-size:13px;font-weight:500;cursor:pointer;transition:all .15s ease}.chart-btn-secondary:hover{background:var(--surface-subtle);color:var(--text-primary);border-color:var(--border-strong)}.chart-btn-primary{height:36px;padding:0 20px;border:1px solid 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.chart-section-card{background:var(--surface);border-color:var(--border)}:root[data-theme=dark] .chart-mode-segmented-control{background:var(--background);border-color:var(--border)}:root[data-theme=dark] .chart-mode-tab.is-active{background:var(--surface-hover);color:var(--text-primary)}:root[data-theme=dark] .chart-type-btn{background:var(--surface);border-color:var(--border);color:var(--text-tertiary)}:root[data-theme=dark] .chart-type-btn.is-active,:root[data-theme=dark] .chart-type-btn:hover{background:var(--surface-hover);color:var(--text-primary)}:root[data-theme=dark] .chart-type-btn.is-active{border-color:var(--border-strong)}:root[data-theme=dark] .chart-palette-chip{background:var(--background);border-color:var(--border)}:root[data-theme=dark] .chart-palette-chip:hover{background:var(--surface-subtle)}:root[data-theme=dark] .chart-palette-chip.is-selected{background:var(--surface-subtle);border-color:var(--border-strong)}:root[data-theme=dark] .chart-palette-name{color:var(--text-primary)}:root[data-theme=dark] .chart-custom-palette-box{background:var(--background);border-color:var(--border)}:root[data-theme=dark] .chart-color-slot{background:var(--surface);border-color:var(--border)}:root[data-theme=dark] .chart-color-hex-input{color:var(--text-primary)}:root[data-theme=dark] .chart-field-item input[type=text],:root[data-theme=dark] .chart-field-item select,:root[data-theme=dark] .chart-number-input{background:var(--background);border-color:var(--border);color:var(--text-primary)}:root[data-theme=dark] .chart-toggle-chip{color:var(--text-tertiary)}:root[data-theme=dark] .chart-surface-color-inputs input[type=text],:root[data-theme=dark] .chart-surface-color-picker .color-picker-trigger,:root[data-theme=dark] .chart-surface-style-card,:root[data-theme=dark] .chart-toggle-chip{background:var(--background);border-color:var(--border)}:root[data-theme=dark] .chart-toggle-chip.is-active,:root[data-theme=dark] .chart-toggle-chip:hover{background:var(--surface-hover);border-color:var(--border-strong);color:var(--text-primary)}:root[data-theme=dark] .chart-toggle-chip-indicator{border-color:var(--border-strong)}:root[data-theme=dark] .chart-toggle-chip.is-active .chart-toggle-chip-indicator{background:var(--text-primary)}:root[data-theme=dark] .chart-surface-color-inputs input[type=text]{color:var(--text-primary)}:root[data-theme=dark] .chart-pill-checkbox{background:var(--surface);border-color:var(--border);color:var(--text-tertiary)}:root[data-theme=dark] .chart-pill-box{background:var(--background);border-color:var(--border-strong)}:root[data-theme=dark] .chart-btn-secondary,:root[data-theme=dark] .chart-dataset-add-btn,:root[data-theme=dark] .chart-modal-close-btn{background:var(--surface);border-color:var(--border);color:var(--text-tertiary)}:root[data-theme=dark] .chart-btn-secondary:hover,:root[data-theme=dark] .chart-dataset-add-btn:hover,:root[data-theme=dark] .chart-modal-close-btn:hover{background:var(--surface-hover);color:var(--text-primary)}:root[data-theme=dark] .chart-spreadsheet td,:root[data-theme=dark] .chart-spreadsheet th{background:var(--surface);border-color:var(--border)}:root[data-theme=dark] .chart-td-idx,:root[data-theme=dark] .chart-th-header,:root[data-theme=dark] .chart-th-idx{background:var(--background)!important}:root[data-theme=dark] .chart-cell-input,:root[data-theme=dark] .chart-th-input{color:var(--text-primary)}:root[data-theme=dark] .chart-preview-canvas-container{background:var(--surface);border-color:var(--border)}.math-insert-header{align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;font-size:12px}.math-insert-header strong{font-size:13px}.math-insert-header span{color:var(--text-tertiary)}.math-insert-actions{gap:8px;margin-bottom:12px}.toolbar .math-insert-actions>button{display:inline-flex;align-items:center;gap:7px;width:auto;min-width:0;height:34px;padding:0 11px;border:1px 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.math-insert-actions>button{border-color:var(--border-strong);background:var(--surface-hover);color:var(--text-primary)}:root[data-theme=dark] .toolbar .math-template-card:hover{border-color:var(--border-strong);background:var(--surface-hover)}:root[data-theme=dark] .chart-checkbox-list label,:root[data-theme=dark] .chart-dataset-header button,:root[data-theme=dark] .chart-dataset-panel,:root[data-theme=dark] .chart-dataset-table td,:root[data-theme=dark] .chart-dataset-table th,:root[data-theme=dark] .chart-editor-actions button,:root[data-theme=dark] .chart-editor-header button,:root[data-theme=dark] .chart-editor-mode-switch button,:root[data-theme=dark] .chart-editor-overlay,:root[data-theme=dark] .chart-editor-preview,:root[data-theme=dark] .chart-node-toolbar button,:root[data-theme=dark] .toolbar .chart-insert-actions>button{border-color:var(--border-strong);background:var(--surface-hover);color:var(--text-primary)}:root[data-theme=dark] .chart-dataset-table 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