:root {
  --bg-canvas: #f4f4f2;
  --bg-device: #ffffff;
  --surface: #ffffff;
  --surface-muted: #f8f8f6;
  --surface-strong: #efefeb;
  --border-soft: rgba(17, 17, 17, 0.08);
  --border-strong: rgba(17, 17, 17, 0.14);
  --text-primary: #111111;
  --text-secondary: #4d4d4d;
  --text-tertiary: #767676;
  --text-inverse: #ffffff;
  --shadow-frame: 0 22px 60px rgba(17, 17, 17, 0.08);
  --shadow-soft: 0 10px 28px rgba(17, 17, 17, 0.06);
  --shadow-press: 0 4px 12px rgba(17, 17, 17, 0.08);
  --radius-xs: 10px;
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --line-height-base: 1.45;
  --safe-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  --safe-top: calc(10px + env(safe-area-inset-top, 0px));
}