:root {
  /* Primary palette */
  --color-primary: #2563eb;
  --color-primary-dark: #1e40af;
  --color-primary-light: #60a5fa;

  /* Accent */
  --color-accent: #8b5cf6;
  --color-accent-light: #a78bfa;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #2563eb 100%);
  --gradient-cta: linear-gradient(90deg, #2563eb, #8b5cf6);
  --gradient-card-hover: linear-gradient(135deg, #eff6ff, #f5f3ff);

  /* Neutrals */
  --color-bg: #ffffff;
  --color-bg-light: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-inverse: #f8fafc;
  --color-border: #e2e8f0;

  /* Typography */
  --font-heading: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  --shadow-card-hover: 0 12px 36px rgba(37, 99, 235, 0.15);

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

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