$font-family-sans: 'Inter', system-ui, -apple-system, sans-serif; $font-family-mono: 'Fira Code', monospace; $font-xs: 0.75rem; $font-sm: 0.875rem; $font-md: 1rem; $font-lg: 1.25rem; $font-xl: 1.5rem; $font-2xl: 2rem; $font-3xl: 3rem; $font-size-svg-number: 0.3125rem; $font-size-srs-label: 0.625rem; $font-size-heatmap-label: 0.5625rem; $weight-regular: 400; $weight-medium: 500; $weight-bold: 700; $weight-black: 900; $tracking-tighter: -0.05em; $tracking-tight: -0.025em; $tracking-normal: 0em; $tracking-wide: 0.025em; $tracking-wider: 0.05em; $leading-tight: 1.2; $leading-normal: 1.5; $leading-loose: 1.8;