:root {
  /* Brand Primary Tokens (Trust Blue) */
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-primary-light: #EFF6FF;

  /* Semantic Feedback Tokens */
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  --color-warning: #F59E0B;
  --color-warning-bg: #FFFBEB;
  --color-danger: #EF4444;
  --color-danger-bg: #FEF2F2;

  /* Neutral Surface & Layout Tokens */
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F1F5F9;
  --color-border: #E2E8F0;
  --color-border-focus: #3B82F6;

  /* Typography Colors */
  --color-text-main: #0F172A;
  --color-text-sub: #64748B;
  --color-text-muted: #94A3B8;
  --color-text-inverse: #FFFFFF;

  /* Child Overlay Deep Indigo */
  --color-child-bg: #1E1B4B;
  --color-child-accent: #6366F1;

  /* Typography Scale */
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  --font-size-3xl: 32px;

  --line-height-tight: 1.2;
  --line-height-normal: 1.4;
  --line-height-loose: 1.6;

  /* Elevations & Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-lock-active: 0 0 24px rgba(239, 68, 68, 0.35);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 350ms cubic-bezier(0.34, 1.56, 0.64, 1);
}