:root {
  /* 品牌色彩 */
  --color-primary: #103DB1;
  --color-primary-dark: #0C2E85;
  --color-primary-light: #1A52D8;
  --color-tech-blue: #00A8E8;
  --color-blue-bright: #3B82F6;
  --color-accent: #F59E0B;
  --color-accent-hover: #D97706;
  
  /* 中性色 */
  --color-dark: #1E293B;
  --color-dark-deep: #0F172A;
  --color-white: #FFFFFF;
  --color-bg-light: #F8FAFC;
  --color-bg-blue: #EFF6FF;
  --color-text-primary: #334155;
  --color-text-secondary: #64748B;
  --color-border: #E2E8F0;
  
  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #103DB1 0%, #00A8E8 100%);
  --gradient-card: linear-gradient(135deg, #103DB1 0%, #3B82F6 100%);
  --gradient-dark: linear-gradient(180deg, #1E293B 0%, #0F172A 100%);
  
  /* 字体 */
  --font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Inter", "Segoe UI", Roboto, sans-serif;
  --font-family-en: "Inter", "Segoe UI", Roboto, sans-serif;
  
  /* 字号 */
  --text-hero: 48px;
  --text-hero-mobile: 32px;
  --text-section: 36px;
  --text-section-mobile: 24px;
  --text-card-title: 20px;
  --text-body: 16px;
  --text-small: 14px;
  
  /* 行高 */
  --leading-tight: 1.2;
  --leading-normal: 1.3;
  --leading-relaxed: 1.7;
  
  /* 间距 */
  --spacing-section: 80px;
  --spacing-section-mobile: 60px;
  --container-max: 1280px;
  --container-padding: 24px;
  --container-padding-mobile: 16px;
  
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 4px 20px rgba(16, 61, 177, 0.15);
  
  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index层级 */
  --z-navbar: 1000;
  --z-mobile-menu: 999;
  --z-modal: 2000;
}