/**
 * CSS Custom Properties (Variables)
 * Design tokens for consistent theming across the site
 */

:root {
  /* Colors */
  --color-primary: #2c5aa0;
  --color-primary-dark: #1e3d6f;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-heading: #1a1a1a;
  --color-link: #2c5aa0;
  --color-link-hover: #1e3d6f;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f5;
  --color-border: #dddddd;
  --color-border-light: #eeeeee;

  /* Spacing */
  --space-xs: 0.25rem;    /* 4px */
  --space-sm: 0.5rem;     /* 8px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2rem;       /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4rem;      /* 64px */

  /* Typography */
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-heading: var(--font-body);

  --font-size-base: 16px;
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Layout */
  --container-max-width: 1200px;
  --sidebar-width: 300px;
  --border-radius: 4px;
  --border-radius-lg: 8px;

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

  /* Breakpoints (for reference in media queries) */
  /* Mobile: < 768px */
  /* Tablet: 768px - 1023px */
  /* Desktop: >= 1024px */
}