#arenaPreview[hidden]{display:none}
.stage-random{display:grid;place-items:center;aspect-ratio:16/9;width:100%;background:radial-gradient(ellipse at center,#25435f,#0d1426);color:#d5ff46;font:bold clamp(30px,5vw,68px) system-ui;text-shadow:0 0 20px #b9ff4560}
.arena-preview:has(img[hidden]){background:radial-gradient(ellipse at center,#25435f,#0d1426)}
.arena-preview:has(img[hidden])::before{content:'?';position:absolute;inset:0;display:grid;place-items:center;color:#d5ff46;font:bold 140px system-ui}
.room-stage-setup{margin:24px 0}.private-app select{display:block;width:100%;background:#09121b;color:#fff;font:inherit;padding:12px;min-height:46px;border:1px solid #42534c;margin:8px 0 16px}.private-app select:focus-visible{outline:2px solid #d5ff46;outline-offset:3px}