/* 通用首页 - 中性背景
   合规要点：
   - 纯 CSS 渐变，无外部图片
   - 暖色到冷色自然过渡（日落/山景意象）
   - 弱对比，避免抢眼
*/
body.on-login {
  background:
    linear-gradient(
      135deg,
      #e0e7ff 0%,
      #c7d2fe 25%,
      #fce7f3 50%,
      #fed7aa 75%,
      #fef3c7 100%
    );
  background-attachment: fixed;
  background-size: cover;
}
body.on-login::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.35) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(255,255,255,0.25) 0%, transparent 45%);
}
body.on-login::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 10% 90%, rgba(99,102,241,0.06) 0%, transparent 30%),
    radial-gradient(circle at 90% 10%, rgba(244,114,182,0.06) 0%, transparent 35%);
}
/* 主体内容在遮罩之上 */
body.on-login #app,
body.on-login #topbar,
body.on-login #icp-footer {
  position: relative;
  z-index: 1;
}