:root{--bg: #f5f5f5;--surface: #ffffff;--surface-alt: #fafafa;--header-bg: #e0e0e0;--header-fg: #1a3a6c;--cell-fg: #1c1c1c;--grid: #c0c0c0;--even-row: #ffffff;--odd-row: #f0f0f0;--selected-bg: #3399ff;--selected-fg: #ffffff;--green: #2e7d32;--light-green: #a5d6a7;--red: #c62828;--light-red: #ef9a9a;--yellow: #f9a825;--blue: #1976d2;--cyan: #00838f;--muted: #757575;--accent: #1976d2;--accent-hover: #1565c0;--success: #2e7d32;--success-hover: #1b5e20;--danger: #c62828;--danger-hover: #b71c1c;--warning: #ef6c00;--nav-bg: #ececec;--nav-hover: #dcdcdc;--section-bg: #fafafa;--input-bg: #ffffff;--input-border: #b0b0b0}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:Segoe 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