:root {
  /* Colors - Dark Mode (default) */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a28;
  --color-surface: #16162a;
  --color-text-primary: #e8e8f0;
  --color-text-secondary: #9898b0;
  --color-text-tertiary: #606078;
  --color-accent-primary: #6c5ce7;
  --color-accent-hover: #a29bfe;
  --color-accent-glow: rgba(108, 92, 231, 0.3);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);
  --color-card-bg: #12121a;
  --color-card-hover: #1a1a28;
  --color-overlay: rgba(0, 0, 0, 0.6);

  /* Typography */
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.5rem;

  /* Font Weights */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Line Heights */
  --leading-tight: 1.2;
  --leading-normal: 1.6;
  --leading-relaxed: 1.8;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Layout */
  --nav-height: 56px;
  --container-max: 1200px;
  --container-narrow: 800px;
}

/* Light Mode */
[data-theme="light"] {
  --color-bg-primary: #f8f8fc;
  --color-bg-secondary: #ffffff;
  --color-bg-tertiary: #f0f0f5;
  --color-surface: #ffffff;
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4a4a68;
  --color-text-tertiary: #7a7a98;
  --color-accent-primary: #5a4bd4;
  --color-accent-hover: #6c5ce7;
  --color-accent-glow: rgba(90, 75, 212, 0.2);
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-hover: rgba(0, 0, 0, 0.15);
  --color-card-bg: #ffffff;
  --color-card-hover: #f5f5fa;
  --color-overlay: rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}