:root {
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "DM Mono", "Courier New", monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 600;
  --leading-tight: 1.3;
  --leading-normal: 1.6;
  --leading-loose: 1.9;
  --color-paper: #F7F5F0;
  --color-paper-raised: #FFFFFF;
  --color-paper-sunken: #EFECE5;
  --color-ink: #1A1916;
  --color-ink-muted: #6B6860;
  --color-ink-faint: #C4C1B8;
  --color-accent: #1C3A5E;
  --color-accent-hover: #16304F;
  --color-accent-text: #FFFFFF;
  --color-error: #8B2020;
  --color-error-bg: #FDF3F3;
  --color-success: #1A5C2E;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --border-thin: 1px solid var(--color-ink-faint);
  --border-medium: 1.5px solid var(--color-ink-faint);
  --shadow-sm: 0 1px 3px rgba(26, 25, 22, 0.06);
  --shadow-md: 0 4px 12px rgba(26, 25, 22, 0.08);
  --transition-fast: 120ms ease;
  --transition-base: 200ms ease;
  --sidebar-width: 260px;
  --input-bar-height: auto;
  --chat-max-width: 720px;
}