:root {
  /* 品牌色 */
  --color-primary: #1a56db;
  --color-primary-dark: #1340a8;
  --color-secondary: #0ea5e9;
  --color-accent: #f59e0b;

  /* 文字色 */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-light: #ffffff;

  /* 背景色 */
  --bg-white: #ffffff;
  --bg-light: #f8fafc;
  --bg-dark: #0f172a;

  /* 字体 */
  --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* 间距 */
  --section-padding: 80px 0;
  --container-width: 1200px;
  --border-radius: 8px;

  /* 阴影 */
  --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);

  /* 过渡 */
  --transition: all 0.3s ease;
}