:root {
  /* Color System */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f5f5f5;
  --color-bg-panel: rgba(0, 0, 0, 0.05);
  --color-text-primary: #000000;
  --color-text-secondary: rgba(0, 0, 0, 0.6);
  --color-accent: #22c55e;
  --color-border: rgba(0, 0, 0, 0.1);

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

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;

  /* Touch Targets */
  --touch-target-min: 44px;

  /* Border Radius */
  --border-radius: 0.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-user-select: none;
  user-select: none;
}

/* Prevent pull-to-refresh on mobile */
body {
  overscroll-behavior: none;
}