.category-hero--stadium .category-artifact { position: absolute; z-index: -1; top: 5%; right: -10%; width: min(53vw, 780px); aspect-ratio: 1; pointer-events: none; opacity: .6; }
.category-hero--stadium .category-artifact::before { content: ''; position: absolute; inset: 38%; border-radius: 50%; background: #fff0d0; box-shadow: 0 0 22px #ff9468, 0 0 82px rgba(213,19,23,.92); animation: ff-stadium-call 3.2s ease-out infinite; }
.category-hero--stadium .category-artifact::after { content: ''; position: absolute; inset: 14%; border-radius: 50%; background: repeating-conic-gradient(from 225deg, rgba(255,230,199,.55) 0 1deg, transparent 1deg 16deg); -webkit-mask: radial-gradient(circle, transparent 0 48%, #000 49% 50%, transparent 51% 63%, #000 64% 65%, transparent 66%); mask: radial-gradient(circle, transparent 0 48%, #000 49% 50%, transparent 51% 63%, #000 64% 65%, transparent 66%); animation: ff-stadium-vibrate 2.4s ease-in-out infinite; }
.category-hero--stadium .category-artifact i { --delay: 0s; position: absolute; inset: 28%; border: 1px solid rgba(255,235,208,.76); border-radius: 50%; animation: ff-stadium-wave 3.2s cubic-bezier(.16,1,.3,1) infinite; animation-delay: var(--delay); }
.category-hero--stadium .category-artifact i:nth-child(1) { --delay: 0s; }.category-hero--stadium .category-artifact i:nth-child(2) { --delay: .48s; }.category-hero--stadium .category-artifact i:nth-child(3) { --delay: .96s; }.category-hero--stadium .category-artifact i:nth-child(4) { --delay: 1.44s; }.category-hero--stadium .category-artifact i:nth-child(n+5) { display: none; }
@keyframes ff-stadium-wave { 0% { opacity: 0; transform: scale(.36); } 20% { opacity: .9; } 85%,100% { opacity: 0; transform: scale(1.6); } }
@keyframes ff-stadium-call { 0%,100% { opacity: .2; transform: scale(.8); } 18% { opacity: 1; transform: scale(1.12); } 42% { opacity: .3; transform: scale(.94); } }
@keyframes ff-stadium-vibrate { 0%,100% { transform: rotate(-1deg) scale(.99); } 50% { transform: rotate(1deg) scale(1.01); } }
@media (max-width: 680px) { .category-hero--stadium .category-artifact { top: 19%; right: -58%; width: 145vw; opacity: .34; } }
@media (prefers-reduced-motion: reduce) { .category-hero--stadium .category-artifact::before, .category-hero--stadium .category-artifact::after, .category-hero--stadium .category-artifact i { animation: none; opacity: .3; } }