html.sp-auth-checking body{visibility:hidden}
html.sp-auth-checking::before{
  content:'Validando sesión segura...';position:fixed;inset:0;display:grid;place-items:center;
  background:radial-gradient(circle at 30% 20%,rgba(56,189,248,.18),transparent 34%),linear-gradient(135deg,#050b16,#0f172a);
  color:#e5e7eb;font:700 16px Segoe UI,Arial,sans-serif;z-index:2147483647;letter-spacing:.2px
}
html.sp-auth-checking::after{
  content:'';position:fixed;left:50%;top:calc(50% + 36px);width:28px;height:28px;margin-left:-14px;border-radius:50%;
  border:3px solid rgba(226,232,240,.25);border-top-color:#38bdf8;z-index:2147483647;animation:spGuardSpin .8s linear infinite
}
@keyframes spGuardSpin{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){html.sp-auth-checking::after{animation:none}}