/* Вариант 4 — тёмный минимализм, неоновая сетка */

body.variant-4 {
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(80, 255, 190, 0.14), transparent 65%),
    radial-gradient(ellipse 50% 40% at 100% 100%, rgba(90, 130, 255, 0.12), transparent 65%),
    linear-gradient(180deg, #060810 0%, #0a0e18 100%);
}

body.variant-4::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(110, 255, 200, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 255, 200, 0.07) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, black 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, black 0%, transparent 75%);
}

body.variant-4 .card {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(120, 255, 210, 0.25);
  box-shadow:
    0 24px 70px rgba(0, 0, 0, 0.6),
    0 0 50px rgba(90, 255, 190, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

body.variant-4 .glass-btn {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(120, 255, 210, 0.22);
}

body.variant-4 .glass-btn:hover {
  background: rgba(120, 255, 210, 0.10);
  box-shadow:
    0 14px 40px rgba(0, 0, 0, 0.4),
    0 0 22px rgba(110, 255, 195, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}