:root {
  --color-ink: #1f2937;
  --color-ink-soft: #4b5563;
  --color-paper: #ffffff;
  --color-accent: #b45309;
  --color-line: #d1d5db;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --text-base: 1.0625rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --radius-sm: 0.5rem;
}