.login-shell {
  gap: 18px;
  position: relative;
  isolation: isolate;
  background: #0b355d url('/login-wallpaper.webp') center / cover no-repeat;
}

.login-shell::before {
  content: '';
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(4,20,38,.28), rgba(4,25,48,.08) 48%, rgba(4,20,38,.36)),
    linear-gradient(0deg, rgba(2,18,34,.38), transparent 58%);
}

.login-shell > .brand {
  padding: 10px 14px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 18px;
  background: rgba(5,25,45,.48);
  backdrop-filter: blur(8px);
}

.login-shell > .brand h1,
.login-shell > .brand p {
  color: #fff;
  text-shadow: 0 2px 12px rgba(0,0,0,.4);
}

.login-shell .login-card {
  border: 1px solid rgba(255,255,255,.7);
  background: rgba(255,255,255,.95);
  box-shadow: 0 20px 60px rgba(3,22,42,.34);
  backdrop-filter: blur(12px);
}

@media (max-width: 560px) {
  .login-shell { padding: 18px; background-position: 40% center; }
  .login-shell > .brand { width: min(420px,92vw); }
}