:root {
  /* Colors - Light Theme */
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-elevated: #f1f5f9;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-muted: #64748b;
  
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-focus: #3b82f6;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  --text-display: clamp(2.25rem, 5vw, 3.75rem);
  --text-h1: clamp(1.875rem, 4vw, 2.5rem);
  --text-h2: clamp(1.5rem, 3vw, 2rem);
  --text-h3: clamp(1.25rem, 2vw, 1.5rem);
  --text-body: 1rem;
  --text-small: 0.875rem;
  --text-label: 0.75rem;

  /* 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;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-pill: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  /* Motion */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #090d16;
    --bg-surface: #111827;
    --bg-elevated: #1f2937;
    --border-color: #374151;
    --text-primary: #f9fafb;
    --text-muted: #9ca3af;
  }
}

[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-surface: #111827;
  --bg-elevated: #1f2937;
  --border-color: #374151;
  --text-primary: #f9fafb;
  --text-muted: #9ca3af;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-elevated: #f1f5f9;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-muted: #64748b;
}

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  margin: 0;
  padding: 0;
  direction: ltr;
}

*:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}