:root{color-scheme:dark;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#05070a;color:#f7fbff;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0;background:linear-gradient(90deg,#05070aeb,#08181cc2),linear-gradient(180deg,#05070a33,#05070ad1),url(/stadium-hero.png) center / cover fixed}button,input{font:inherit}button{border:0}button:disabled{cursor:not-allowed;opacity:.5}.app-shell{display:flex;flex-direction:column;gap:24px;width:min(1180px,calc(100% - 32px));min-height:100vh;margin:0 auto;padding:28px 0}.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:14px}.brand-mark{display:grid;width:48px;height:48px;place-items:center;border:1px solid rgba(255,255,255,.18);border-radius:8px;background:#ffffff1a;color:#ffc247}.brand h1,.brand p{margin:0}.brand h1{font-size:clamp(2rem,6vw,4.8rem);line-height:.92}.eyebrow{color:#7be2ff;font-size:.78rem;font-weight:800;letter-spacing:0;text-transform:uppercase}.status-strip{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}.status-pill{display:inline-flex;align-items:center;gap:6px;min-height:34px;padding:0 12px;border:1px solid rgba(255,255,255,.14);border-radius:8px;background:#ffffff1a;color:#dbe7ef;font-size:.9rem;font-weight:800}.status-pill.ready{border-color:#64e28e6b;color:#9effb6}.status-pill.waiting{border-color:#ffc24766;color:#ffd27a}.workspace{display:grid;grid-template-columns:320px minmax(0,1fr);gap:20px;align-items:start}.control-panel,.quiz-board,.leaderboard{border:1px solid rgba(255,255,255,.15);border-radius:8px;background:#070d10c7;box-shadow:0 24px 70px #00000047;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.control-panel{display:flex;flex-direction:column;gap:16px;padding:16px}.mode-tabs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.mode-tabs button,.secondary-action,.icon-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;border:1px solid rgba(255,255,255,.12);border-radius:8px;background:#ffffff14;color:#eef7fb;cursor:pointer;font-weight:800}.mode-tabs button.active{border-color:#7be2ff80;background:#7be2ff2e;color:#fff}.field-label{color:#9fb4be;font-size:.86rem;font-weight:800}.text-input{width:100%;min-height:46px;border:1px solid rgba(255,255,255,.15);border-radius:8px;background:#ffffff1a;color:#fff;padding:0 12px;outline:none}.text-input:focus{border-color:#7be2ff;box-shadow:0 0 0 3px #7be2ff2e}.code-input{font-weight:900;text-transform:uppercase}.join-row{display:grid;grid-template-columns:minmax(0,1fr) 46px;gap:8px}.icon-button{width:46px;padding:0}.action-stack,.room-actions{display:grid;gap:8px}.primary-action{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;border-radius:8px;background:#ffc247;color:#171008;cursor:pointer;font-weight:900}.primary-action:hover:not(:disabled),.secondary-action:hover:not(:disabled),.mode-tabs button:hover:not(:disabled),.icon-button:hover:not(:disabled),.choice-button:hover:not(:disabled){transform:translateY(-1px)}.score-summary{display:flex;align-items:center;justify-content:space-between;min-height:58px;padding:0 14px;border-radius:8px;background:#ffffff17}.score-summary span{color:#9fb4be;font-weight:800}.score-summary strong{color:#ffc247;font-size:1.9rem}.notice{margin:0;border-left:3px solid #7be2ff;color:#dbe7ef;padding:4px 0 4px 10px;font-weight:700}.arena-panel{min-width:0}.multiplayer-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:16px;align-items:start}.quiz-board{min-height:560px;padding:clamp(18px,3vw,34px)}.question-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px;color:#9fb4be;font-size:.88rem;font-weight:900;text-transform:uppercase}.quiz-board h2{max-width:850px;min-height:112px;margin:0 0 18px;font-size:clamp(1.6rem,4.2vw,3.6rem);line-height:1.02}.empty-state{max-width:680px;margin:0 0 22px;color:#b8c7cf;font-size:1rem;font-weight:700}.choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:20px}.choice-button{display:grid;grid-template-columns:44px minmax(0,1fr);align-items:center;gap:12px;min-height:90px;padding:14px;border:1px solid rgba(255,255,255,.14);border-radius:8px;background:#ffffff17;color:#fff;cursor:pointer;text-align:left;font-size:1.04rem;font-weight:900}.choice-button.selected{border-color:#7be2ff;background:#7be2ff29}.choice-button.correct{border-color:#64e28eb3;background:#64e28e2e}.choice-key{display:grid;width:44px;height:44px;place-items:center;border-radius:8px;background:#f25535;color:#fff;font-weight:1000}.leaderboard{display:grid;gap:8px;padding:14px}.leaderboard-head,.player-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.leaderboard-head{color:#9fb4be;font-weight:900;text-transform:uppercase}.leaderboard-head strong{color:#ffc247}.player-row{min-height:62px;padding:10px;border-radius:8px;background:#ffffff14}.player-row strong,.player-row span{display:block}.player-row span{margin-top:3px;color:#9fb4be;font-size:.82rem;font-weight:800}.player-row.muted{opacity:.6}.player-score{display:inline-flex;align-items:center;gap:6px;color:#9effb6}.player-score strong{min-width:28px;color:#fff;font-size:1.4rem;text-align:right}.next-button{margin-top:18px}svg{width:18px;height:18px;stroke-width:2.4}@media(max-width:940px){.workspace,.multiplayer-layout{grid-template-columns:1fr}.topbar{align-items:flex-start;flex-direction:column}.status-strip{justify-content:flex-start}}@media(max-width:620px){.app-shell{width:min(100% - 20px,1180px);padding:18px 0}.choice-grid{grid-template-columns:1fr}.quiz-board{min-height:auto}.quiz-board h2{min-height:86px}}