/* ============================================
   Design Tokens — 老年大学信息化建设系统 2.0
   ============================================ */

:root {
  /* Colors */
  --color-primary: #1E40AF;
  --color-primary-light: #3B82F6;
  --color-accent: #06B6D4;
  --color-bg-light: #F8FAFC;
  --color-bg-dark: #0F172A;
  --color-text-primary: #1E293B;
  --color-text-secondary: #64748B;
  --color-text-white: #FFFFFF;
  --color-text-light: #94A3B8;
  --color-border: #E2E8F0;

  /* CTA Button Gradient */
  --color-cta-start: #2563EB;
  --color-cta-end: #1D4ED8;

  /* Trust card colors */
  --color-encryption: #3B82F6;
  --color-storage: #06B6D4;
  --color-access: #8B5CF6;
  --color-audit: #10B981;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;

  --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: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
  --border-radius-sm: 6px;
  --border-radius-md: 10px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  --border-radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Breakpoints (for reference — used in media queries) */
  /* Tablet: 768px */
  /* Desktop: 1200px */
}