:root {
  /* Primary Background - Midnight Navy */
  --color-bg: #0A0F1F;
  --color-bg-light: #121829;
  --color-bg-card: #161D33;

  /* Primary Accent - Imperial Jade */
  --color-primary: #1FBF9B;
  --color-primary-dark: #12806A;
  --color-primary-glow: rgba(31, 191, 155, 0.3);

  /* Secondary Accent - Neon Gold */
  --color-gold: #E6C46A;
  --color-gold-soft: #B89A44;
  --color-gold-glow: rgba(230, 196, 106, 0.3);

  /* CTA - Lucky Red */
  --color-cta: #D72638;
  --color-cta-hover: #B81E2E;

  /* Text Colors */
  --color-text: #F2F4F8;
  --color-text-muted: #9AA3B2;
  --color-text-dark: #6B7280;

  /* Status Colors */
  --color-success: #22C55E;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Typography - System fonts only */
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, monospace;

  /* Fluid Typography */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.4vw, 1rem);
  --text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);
  --text-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3rem);

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout */
  --container-max: 1280px;
  --sidebar-width: 320px;
  --header-height: 72px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
  --shadow-glow-primary: 0 0 20px var(--color-primary-glow);
  --shadow-glow-gold: 0 0 20px var(--color-gold-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;
}