:root{
  --font-body:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;

  --color-gray-50:#f9fafb;
  --color-gray-100:#f3f4f6;
  --color-gray-200:#e5e7eb;
  --color-gray-300:#d1d5db;
  --color-gray-400:#9ca3af;
  --color-gray-500:#6b7280;
  --color-gray-600:#4b5563;
  --color-gray-700:#374151;
  --color-gray-900:#111827;

  --color-ink:var(--color-gray-900);
  --color-muted:var(--color-gray-600);
  --color-subtle:var(--color-gray-500);
  --color-faint:var(--color-gray-400);
  --color-line:var(--color-gray-200);
  --color-line-soft:var(--color-gray-100);
  --color-bg:#ffffff;
  --color-bg-soft:var(--color-gray-50);
  --color-bg-soft-translucent:rgba(249,250,251,.6);
  --color-dark-overlay:rgba(17,24,39,.75);
  --color-focus:var(--color-gray-900);

  --container-max:80rem;
  --container-narrow:48rem;
  --space-6:1.5rem;
  --space-8:2rem;
  --radius-lg:.5rem;
  --radius-xl:.75rem;
  --tracking-wide:.2em;
}