:root {
  color-scheme: light;
  --font-sans: Inter, "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.78);
  --color-ink: #172033;
  --color-ink-soft: #334155;
  --color-muted: #64748b;
  --color-faint: #94a3b8;
  --color-border: #e2e8f0;
  --color-brand: #0d9488;
  --color-brand-strong: #0f766e;
  --color-brand-soft: #f0fdfa;
  --color-accent: #3b82f6;
  --color-accent-soft: #eff6ff;
  --color-success: #047857;
  --color-success-soft: #ecfdf5;
  --color-warning: #b45309;
  --color-warning-soft: #fffbeb;
  --color-danger: #b42318;
  --color-danger-soft: #fef3f2;
  --radius-sm: 0.625rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.5rem;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 12px 32px -16px rgba(15, 23, 42, 0.22);
  --shadow-brand: 0 18px 44px -22px rgba(13, 148, 136, 0.38);
  --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;
  --space-16: 4rem;
  --content-width: 76rem;
  --duration-fast: 150ms;
  --duration-normal: 280ms;
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --focus-ring: 0 0 0 3px rgba(20, 184, 166, 0.24);
}