/**
 * 子页面统一背景：纯色微光
 * 深蓝黑底 + 极淡径向光晕，静态无交互，适配所有子页（卡片浮于其上）
 */
html, body {
  min-height: 100%;
}

body {
  background-color: #0a1020;
  background-image:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(56, 110, 200, 0.22), transparent 60%),
    radial-gradient(ellipse 60% 50% at 100% 100%, rgba(40, 70, 140, 0.18), transparent 60%),
    radial-gradient(ellipse 60% 50% at 0% 100%, rgba(30, 55, 110, 0.16), transparent 60%);
  background-attachment: fixed;
  background-repeat: no-repeat;
}