/* RadLearn V9.3.0 - Arena UI, Experience & Resource Optimization */

.v90-arena-entry,
.v90-arena-room{
  --arena-accent:var(--theme-accent);
  --arena-accent-2:var(--theme-accent-2);
  --arena-bg:color-mix(in srgb,var(--bg) 90%,var(--theme-accent) 10%);
  --arena-surface:color-mix(in srgb,var(--surface) 96%,var(--theme-accent) 4%);
  --arena-surface-strong:color-mix(in srgb,var(--surface) 91%,var(--theme-accent) 9%);
  --arena-soft:color-mix(in srgb,var(--theme-soft) 72%,var(--surface) 28%);
  --arena-line:color-mix(in srgb,var(--theme-accent) 24%,var(--line));
  --arena-line-strong:color-mix(in srgb,var(--theme-accent) 46%,var(--line));
  --arena-text:var(--ink);
  --arena-muted:var(--muted);
  --arena-glow:color-mix(in srgb,var(--theme-accent) 20%,transparent);
  --arena-glow-strong:color-mix(in srgb,var(--theme-accent) 34%,transparent);
  --arena-success:#18a979;
  --arena-danger:#df5366;
  --arena-warning:#e2a32e;
  --arena-gold:#dca72f;
  color:var(--arena-text);
}

/* -------------------- Arena entry -------------------- */
.v90-arena-entry{display:grid;gap:20px;max-width:1240px;margin:0 auto}
.v90-arena-entry-hero{position:relative;overflow:hidden;min-height:330px;border-radius:30px;padding:44px;background:
  radial-gradient(circle at 86% 18%,color-mix(in srgb,var(--arena-accent) 24%,transparent),transparent 28%),
  radial-gradient(circle at 68% 92%,color-mix(in srgb,var(--arena-accent-2) 17%,transparent),transparent 34%),
  linear-gradient(145deg,var(--arena-surface),var(--arena-soft));
  border:1px solid var(--arena-line);display:grid;grid-template-columns:minmax(0,1fr) 310px;align-items:center;gap:34px;
  box-shadow:0 24px 60px color-mix(in srgb,var(--ink) 9%,transparent)}
.v90-arena-entry-hero:before{content:"";position:absolute;inset:0;pointer-events:none;background-image:
  linear-gradient(color-mix(in srgb,var(--arena-accent) 7%,transparent) 1px,transparent 1px),
  linear-gradient(90deg,color-mix(in srgb,var(--arena-accent) 7%,transparent) 1px,transparent 1px);background-size:30px 30px;mask-image:linear-gradient(90deg,#000,transparent 96%)}
.v90-arena-entry-hero:after{content:"";position:absolute;width:240px;height:240px;border-radius:50%;right:-80px;top:-90px;background:color-mix(in srgb,var(--arena-accent) 14%,transparent);filter:blur(10px);animation:v91Ambient 7s ease-in-out infinite alternate;pointer-events:none}
.v90-arena-entry-copy,.v90-arena-emblem{position:relative;z-index:1}
.v90-arena-entry-copy .eyebrow,.v90-lobby-hero .eyebrow{color:var(--arena-accent);letter-spacing:.14em;margin:16px 0 2px}
.v90-arena-entry-copy h1{font-size:clamp(40px,5.6vw,68px);line-height:1;letter-spacing:-.045em;margin:10px 0 17px;color:var(--arena-text)}
.v90-arena-entry-copy>p:last-of-type{font-size:15px;line-height:1.7;color:var(--arena-muted);max-width:680px}
.v90-live-chip{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:color-mix(in srgb,var(--arena-success) 10%,var(--arena-surface));border:1px solid color-mix(in srgb,var(--arena-success) 28%,var(--arena-line));color:color-mix(in srgb,var(--arena-success) 72%,var(--arena-text));font-size:10px;font-weight:850;letter-spacing:.11em}
.v90-live-chip i{width:8px;height:8px;border-radius:50%;background:var(--arena-success);box-shadow:0 0 0 5px color-mix(in srgb,var(--arena-success) 12%,transparent),0 0 14px color-mix(in srgb,var(--arena-success) 48%,transparent);animation:v91LivePulse 1.7s ease-in-out infinite}
.v90-arena-feature-row{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px}
.v90-arena-feature-row span{display:flex;align-items:center;gap:7px;border-radius:12px;padding:9px 12px;background:color-mix(in srgb,var(--arena-surface) 82%,transparent);border:1px solid var(--arena-line);font-size:11px;color:var(--arena-text);box-shadow:0 8px 18px color-mix(in srgb,var(--ink) 4%,transparent)}
.v90-arena-feature-row .icon{width:16px;color:var(--arena-accent)}
.v90-arena-emblem{justify-self:end;width:260px;aspect-ratio:1;border-radius:50%;display:grid;place-items:center;align-content:center;gap:7px;background:radial-gradient(circle at 38% 32%,color-mix(in srgb,var(--arena-accent) 25%,var(--arena-surface)),var(--arena-surface-strong) 54%,var(--arena-surface) 74%);border:1px solid var(--arena-line-strong);box-shadow:0 0 0 16px color-mix(in srgb,var(--arena-accent) 5%,transparent),0 0 0 34px color-mix(in srgb,var(--arena-accent-2) 4%,transparent),0 22px 50px color-mix(in srgb,var(--ink) 10%,transparent);animation:v91EmblemFloat 5s ease-in-out infinite}
.v90-arena-emblem span{width:84px;height:84px;border-radius:26px;display:grid;place-items:center;background:linear-gradient(145deg,color-mix(in srgb,var(--arena-gold) 17%,var(--arena-surface)),color-mix(in srgb,var(--arena-accent) 12%,var(--arena-surface)));color:var(--arena-gold);border:1px solid color-mix(in srgb,var(--arena-gold) 36%,var(--arena-line))}
.v90-arena-emblem .icon{width:43px;height:43px}.v90-arena-emblem b{font-size:27px;letter-spacing:.17em}.v90-arena-emblem small{font-size:8px;color:var(--arena-muted);letter-spacing:.2em}

.v90-arena-choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}
.v90-arena-choice{appearance:none;text-align:left;border:1px solid var(--line);background:var(--surface);border-radius:23px;padding:25px;display:grid;grid-template-columns:64px 1fr;gap:19px;color:var(--ink);cursor:pointer;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;background-color .2s ease;box-shadow:var(--shadow)}
.v90-arena-choice:hover{transform:translateY(-4px);border-color:var(--arena-line-strong);box-shadow:0 23px 54px color-mix(in srgb,var(--theme-accent) 13%,transparent)}
.v90-arena-choice>i{width:64px;height:64px;border-radius:19px;display:grid;place-items:center;background:var(--theme-soft);color:var(--theme-accent)}
.v90-arena-choice.join>i{background:color-mix(in srgb,var(--theme-accent-2) 12%,var(--surface));color:var(--theme-accent-2)}
.v90-arena-choice>i .icon{width:29px;height:29px}.v90-arena-choice small{font-size:9px;font-weight:900;letter-spacing:.12em;color:var(--muted)}.v90-arena-choice h2{margin:4px 0 8px;font-size:24px}.v90-arena-choice p{margin:0;color:var(--muted);line-height:1.6}.v90-arena-choice span{display:flex;align-items:center;gap:6px;margin-top:15px;font-weight:800;color:var(--theme-accent)}.v90-arena-choice span .icon{width:15px}
.v90-arena-setup{border:1px solid var(--line);background:var(--surface);border-radius:25px;padding:27px;box-shadow:var(--shadow)}
.v90-arena-setup[hidden]{display:none}.v90-setup-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:23px}.v90-setup-head h2{font-size:27px;margin:4px 0}.v90-setup-head p{margin:0;color:var(--muted)}
.v90-arena-setup fieldset{border:0;padding:0;margin:0 0 21px}.v90-arena-setup legend{font-weight:850;margin-bottom:10px}.v90-choice-pills{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.v90-choice-pills label{position:relative}.v90-choice-pills input{position:absolute;opacity:0;pointer-events:none}.v90-choice-pills span{min-height:52px;border:1px solid var(--line);border-radius:14px;display:grid;place-items:center;padding:9px;background:var(--bg);font-weight:850;cursor:pointer;transition:.18s}.v90-choice-pills.time span{display:flex;flex-direction:column;gap:2px}.v90-choice-pills.time b{font-size:20px}.v90-choice-pills.time small{color:var(--muted);font-size:9px}.v90-choice-pills input:checked+span{border-color:var(--theme-accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--theme-accent) 12%,transparent),0 10px 22px color-mix(in srgb,var(--theme-accent) 9%,transparent);background:color-mix(in srgb,var(--theme-accent) 7%,var(--surface));color:var(--theme-accent)}
.v90-arena-note{display:flex;gap:9px;align-items:flex-start;padding:13px 14px;border-radius:13px;background:color-mix(in srgb,var(--theme-accent) 7%,var(--bg));border:1px solid color-mix(in srgb,var(--theme-accent) 16%,var(--line));color:var(--muted);font-size:12px;margin-bottom:18px}.v90-arena-note .icon{width:17px;flex:none;color:var(--theme-accent)}.v90-arena-primary{min-height:52px;width:100%;justify-content:center}.v90-code-form{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:end}.v90-code-form label{grid-column:1/-1;font-weight:800}.v90-code-form input{font-size:27px!important;letter-spacing:.3em;text-transform:uppercase;text-align:center;font-weight:900;min-height:60px}.v90-code-form .form-error{grid-column:1/-1}
.v90-arena-locked{min-height:500px;border-radius:28px;background:linear-gradient(145deg,var(--arena-surface),var(--arena-soft));color:var(--arena-text);text-align:center;padding:48px;display:grid;place-items:center;align-content:center;gap:10px;border:1px solid var(--arena-line)}.v90-arena-mark{width:88px;height:88px;border-radius:27px;display:grid;place-items:center;background:var(--theme-soft);color:var(--theme-accent)}.v90-arena-mark .icon{width:42px}.v90-arena-locked p{color:var(--arena-muted);max-width:580px}

/* -------------------- Room shell / ambient -------------------- */
body.arena-focus .main{padding:16px;max-width:none}
.v90-arena-room{min-height:calc(100dvh - 32px);border-radius:24px;overflow:hidden;background:var(--arena-bg);border:1px solid var(--arena-line);color:var(--arena-text);box-shadow:0 28px 70px color-mix(in srgb,var(--ink) 12%,transparent)}
.v90-arena-stage{min-height:calc(100dvh - 32px);position:relative;isolation:isolate;background:
  radial-gradient(circle at 88% -8%,color-mix(in srgb,var(--arena-accent) 18%,transparent),transparent 29%),
  radial-gradient(circle at -8% 82%,color-mix(in srgb,var(--arena-accent-2) 12%,transparent),transparent 32%),
  linear-gradient(180deg,var(--arena-bg),color-mix(in srgb,var(--arena-bg) 82%,var(--arena-surface) 18%))}
.v90-arena-stage:before{content:"";position:absolute;z-index:-2;inset:0;pointer-events:none;background-image:linear-gradient(color-mix(in srgb,var(--arena-accent) 6%,transparent) 1px,transparent 1px),linear-gradient(90deg,color-mix(in srgb,var(--arena-accent) 6%,transparent) 1px,transparent 1px);background-size:34px 34px;mask-image:linear-gradient(to bottom,#000,transparent 82%)}
.v90-arena-stage:after{content:"";position:absolute;z-index:-1;width:34vw;min-width:260px;max-width:520px;aspect-ratio:1;right:-10vw;top:12vh;border-radius:50%;background:color-mix(in srgb,var(--arena-accent) 12%,transparent);filter:blur(55px);opacity:.75;animation:v91Ambient 8s ease-in-out infinite alternate;pointer-events:none}

/* -------------------- Lobby -------------------- */
.v90-lobby-hero{position:relative;z-index:1;display:grid;grid-template-columns:1fr auto;gap:24px;align-items:end;padding:36px 40px 26px;border-bottom:1px solid var(--arena-line)}.v90-lobby-hero h1{font-size:46px;margin:5px 0 9px;color:var(--arena-text)}.v90-lobby-hero p{color:var(--arena-muted);margin:0}.v90-room-code{min-width:245px;text-align:center;border:1px solid var(--arena-line-strong);background:color-mix(in srgb,var(--arena-accent) 8%,var(--arena-surface));border-radius:20px;padding:15px 18px;box-shadow:0 16px 34px var(--arena-glow)}.v90-room-code small{display:block;font-size:9px;letter-spacing:.18em;color:var(--arena-muted)}.v90-room-code strong{display:block;font-size:33px;letter-spacing:.18em;color:var(--arena-text);margin:4px 0 8px}.v90-room-code button{appearance:none;border:0;background:none;color:var(--arena-accent);font-weight:800;display:inline-flex;align-items:center;gap:6px;cursor:pointer}.v90-room-code .icon{width:15px}
.v90-lobby-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1fr) 315px;gap:19px;padding:23px 40px 38px}.v90-lobby-main,.v90-lobby-side>*{background:color-mix(in srgb,var(--arena-surface) 93%,transparent);border:1px solid var(--arena-line);border-radius:21px;box-shadow:0 16px 36px color-mix(in srgb,var(--ink) 7%,transparent);backdrop-filter:blur(16px)}.v90-lobby-main{padding:20px}.v90-room-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}.v90-room-meta span{display:flex;align-items:center;gap:7px;padding:8px 10px;border:1px solid var(--arena-line);background:color-mix(in srgb,var(--arena-surface-strong) 80%,transparent);border-radius:10px;color:var(--arena-text);font-size:11px}.v90-room-meta .icon{width:14px;color:var(--arena-accent)}.v90-lobby-head{display:flex;justify-content:space-between;gap:15px;align-items:center}.v90-lobby-head h2{margin:0;color:var(--arena-text)}.v90-lobby-head p{color:var(--arena-muted);margin:4px 0 0}.v90-lock-state{display:flex;gap:7px;align-items:center;color:var(--arena-success);font-size:11px}.v90-lock-state.locked{color:var(--arena-warning)}.v90-lock-state .icon{width:15px}.v90-player-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:16px}.v90-player-card{position:relative;display:grid;grid-template-columns:48px 1fr auto;align-items:center;gap:10px;padding:11px;border:1px solid var(--arena-line);border-radius:15px;background:color-mix(in srgb,var(--arena-surface-strong) 75%,transparent);transition:.18s}.v90-player-card.me{border-color:var(--arena-line-strong);background:color-mix(in srgb,var(--arena-accent) 8%,var(--arena-surface));box-shadow:0 8px 24px var(--arena-glow)}.v90-player-avatar{position:relative;width:48px;height:48px;display:grid;place-items:center}.v90-crown{position:absolute;right:-4px;top:-7px;width:21px;height:21px;border-radius:8px;display:grid;place-items:center;background:color-mix(in srgb,var(--arena-gold) 18%,var(--arena-surface));color:var(--arena-gold);border:1px solid color-mix(in srgb,var(--arena-gold) 35%,var(--arena-line))}.v90-crown .icon{width:12px}.v90-player-copy{min-width:0}.v90-player-copy strong,.v90-player-copy small{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.v90-player-copy strong{color:var(--arena-text);font-size:12px}.v90-player-copy small{color:var(--arena-muted);font-size:9px;margin-top:2px}.v90-player-state{font-size:8px;font-weight:850;padding:6px 8px;border-radius:999px;background:color-mix(in srgb,var(--arena-muted) 9%,var(--arena-surface));color:var(--arena-muted);white-space:nowrap}.v90-player-state.ready{background:color-mix(in srgb,var(--arena-success) 10%,var(--arena-surface));color:var(--arena-success)}.v90-player-state.host{background:color-mix(in srgb,var(--arena-gold) 12%,var(--arena-surface));color:var(--arena-gold)}.v90-kick{position:absolute;right:6px;top:6px;width:24px;height:24px;border:0;border-radius:8px;background:color-mix(in srgb,var(--arena-danger) 8%,var(--arena-surface));color:var(--arena-danger);display:none;place-items:center;cursor:pointer}.v90-player-card:hover .v90-kick{display:grid}.v90-kick .icon{width:12px}.v90-lobby-side{display:grid;gap:12px;align-content:start}.v90-rule-card{padding:18px}.v90-rule-card h3{margin:5px 0 12px;font-size:17px;color:var(--arena-text)}.v90-rule-card ul{margin:0;padding-left:18px;color:var(--arena-muted);font-size:11px;line-height:1.85}.v90-rule-card b{color:var(--arena-text)}.v90-lobby-actions{padding:14px;display:grid;gap:8px}.v90-lobby-actions .btn{width:100%;justify-content:center}.v90-lobby-actions .btn.secondary,.v90-results .btn.secondary{background:var(--arena-surface-strong);border-color:var(--arena-line);color:var(--arena-text)}.v90-lobby-actions .btn.ghost,.v90-results .btn.ghost{color:var(--arena-muted)}

/* -------------------- Countdown -------------------- */
.v90-countdown{position:relative;z-index:1;min-height:calc(100dvh - 32px);display:grid;place-items:center;align-content:center;text-align:center;overflow:hidden;padding:30px}.v90-countdown-orbit{position:absolute;width:min(56vw,460px);aspect-ratio:1;border-radius:50%;border:1px solid var(--arena-line-strong);box-shadow:0 0 0 30px color-mix(in srgb,var(--arena-accent) 4%,transparent),0 0 0 64px color-mix(in srgb,var(--arena-accent-2) 3%,transparent);animation:v91Orbit 3s linear infinite}.v90-countdown p{position:relative;z-index:1;color:var(--arena-accent);font-size:10px;font-weight:900;letter-spacing:.18em}.v90-countdown>strong{position:relative;z-index:1;font-size:clamp(92px,18vw,190px);line-height:.85;color:var(--arena-text);text-shadow:0 0 36px var(--arena-glow-strong);animation:v91CountdownPop .72s ease-in-out infinite alternate}.v90-countdown h2{position:relative;z-index:1;margin:24px 0 5px;color:var(--arena-text)}.v90-countdown small{position:relative;z-index:1;color:var(--arena-muted)}

/* -------------------- Battle HUD -------------------- */
.v90-battle-shell{position:relative;z-index:1;min-height:calc(100dvh - 32px);display:flex;flex-direction:column}.v90-battle-hud{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:16px;padding:12px 18px;background:color-mix(in srgb,var(--arena-surface) 92%,transparent);border-bottom:1px solid var(--arena-line);backdrop-filter:blur(20px);box-shadow:0 8px 30px color-mix(in srgb,var(--ink) 6%,transparent)}.v90-hud-brand{display:flex;align-items:center;gap:9px;min-width:250px}.v90-hud-brand>span{width:40px;height:40px;border-radius:13px;display:grid;place-items:center;background:var(--theme-soft);color:var(--arena-accent);box-shadow:0 0 24px var(--arena-glow)}.v90-hud-brand>span .icon{width:21px}.v90-hud-brand small,.v90-hud-brand strong{display:block}.v90-hud-brand small{font-size:7px;letter-spacing:.12em;color:var(--arena-muted)}.v90-hud-brand strong{font-size:12px;color:var(--arena-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:220px}.v90-hud-metrics{margin-left:auto;display:grid;grid-template-columns:repeat(4,minmax(72px,1fr));gap:6px}.v90-hud-metrics>span{min-width:0;padding:7px 10px;border-radius:12px;background:color-mix(in srgb,var(--arena-surface-strong) 76%,transparent);border:1px solid var(--arena-line);text-align:center;transition:.2s}.v90-hud-metrics small,.v90-hud-metrics b{display:block}.v90-hud-metrics small{font-size:6px;letter-spacing:.1em;color:var(--arena-muted)}.v90-hud-metrics b{font-size:13px;color:var(--arena-text);margin-top:1px}.v90-hud-metrics .timer{border-color:color-mix(in srgb,var(--arena-accent) 32%,var(--arena-line));background:color-mix(in srgb,var(--arena-accent) 7%,var(--arena-surface))}.v91-connection{display:inline-flex;align-items:center;gap:6px;font-size:8px;font-weight:800;color:var(--arena-muted);white-space:nowrap}.v91-connection i,.v91-mobile-rankbar .status i{width:7px;height:7px;border-radius:50%;background:var(--arena-muted)}.v91-connection.online{color:var(--arena-success)}.v91-connection.online i,.v91-mobile-rankbar .status.online i{background:var(--arena-success);box-shadow:0 0 10px color-mix(in srgb,var(--arena-success) 55%,transparent)}.v91-connection.reconnecting{color:var(--arena-warning)}.v91-connection.reconnecting i,.v91-mobile-rankbar .status.reconnecting i{background:var(--arena-warning);animation:v91LivePulse 1s infinite}.v91-connection.offline{color:var(--arena-danger)}.v91-connection.offline i,.v91-mobile-rankbar .status.offline i{background:var(--arena-danger)}.v91-rank-metric.rank-up{border-color:color-mix(in srgb,var(--arena-gold) 60%,var(--arena-line));animation:v91RankUp 1.1s ease}.v90-timebar{height:5px;position:sticky;top:65px;z-index:19;background:color-mix(in srgb,var(--arena-line) 55%,transparent);overflow:hidden}.v90-timebar i{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--arena-accent),var(--arena-accent-2));box-shadow:0 0 14px var(--arena-glow-strong);transition:width .09s linear,background .2s}.v90-battle-shell.time-warning .v90-timebar i{background:linear-gradient(90deg,var(--arena-warning),color-mix(in srgb,var(--arena-warning) 55%,var(--arena-accent)))}.v90-battle-shell.time-warning .timer{border-color:color-mix(in srgb,var(--arena-warning) 48%,var(--arena-line))}.v90-battle-shell.time-danger .v90-timebar i{background:linear-gradient(90deg,var(--arena-danger),#ff866f);animation:v91TimerPulse .55s ease-in-out infinite alternate}.v90-battle-shell.time-danger .timer{border-color:color-mix(in srgb,var(--arena-danger) 55%,var(--arena-line));background:color-mix(in srgb,var(--arena-danger) 7%,var(--arena-surface))}.v91-mobile-rankbar{display:none}

/* -------------------- Question / answers -------------------- */
.v90-battle-layout{width:100%;max-width:1460px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:14px;padding:14px 18px 20px;align-items:start;flex:1}.v90-question-zone,.v90-battle-side{background:color-mix(in srgb,var(--arena-surface) 95%,transparent);border:1px solid var(--arena-line);box-shadow:0 18px 42px color-mix(in srgb,var(--ink) 7%,transparent);backdrop-filter:blur(16px)}.v90-question-zone{min-width:0;min-height:calc(100dvh - 126px);border-radius:21px;padding:22px 24px;display:flex;flex-direction:column;overflow:hidden}.v90-question-kicker{display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--arena-muted);font-size:9px;text-transform:uppercase;letter-spacing:.08em}.v90-question-kicker>span{border:1px solid var(--arena-line-strong);background:color-mix(in srgb,var(--arena-accent) 8%,var(--arena-surface));color:var(--arena-accent);border-radius:999px;padding:7px 11px;font-weight:900}.v90-question-kicker strong{color:var(--arena-gold)}.v90-question-kicker em{font-style:normal}.v91-combo{animation:v91Combo .7s ease}.v91-question-copy{width:100%;max-width:1000px;max-height:min(38vh,410px);overflow:auto;margin:16px 0 18px;padding-right:6px;scrollbar-width:thin;scrollbar-color:var(--arena-line-strong) transparent}.v91-question-text{margin:0;color:var(--arena-text);font-weight:820;letter-spacing:-.015em;overflow-wrap:anywhere}.v91-question-text.q-short{font-size:clamp(29px,2.5vw,35px);line-height:1.28}.v91-question-text.q-medium{font-size:clamp(25px,2.1vw,30px);line-height:1.31}.v91-question-text.q-long{font-size:clamp(21px,1.75vw,25px);line-height:1.34}.v91-question-text.q-xlong{font-size:clamp(18px,1.5vw,21px);line-height:1.38}.v90-arena-images{display:grid;grid-template-columns:1fr;gap:9px;margin:0 0 17px;max-height:300px}.v90-arena-images.multiple{grid-template-columns:repeat(2,minmax(0,1fr))}.v90-arena-image{appearance:none;border:1px solid var(--arena-line);background:color-mix(in srgb,var(--arena-bg) 72%,#000 28%);border-radius:14px;padding:0;overflow:hidden;cursor:zoom-in;min-height:145px}.v90-arena-image img{width:100%;height:100%;max-height:285px;object-fit:contain;display:block}.v90-answer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:8px}.v90-answer{min-height:76px;appearance:none;border:1px solid var(--arena-line);border-radius:16px;background:color-mix(in srgb,var(--arena-surface-strong) 74%,transparent);color:var(--arena-text);display:grid;grid-template-columns:38px 1fr;align-items:center;gap:11px;padding:12px 14px;text-align:left;cursor:pointer;transition:transform .15s ease,border-color .15s ease,background .15s ease,box-shadow .15s ease}.v90-answer:hover:not(:disabled){border-color:var(--arena-line-strong);background:color-mix(in srgb,var(--arena-accent) 8%,var(--arena-surface));transform:translateY(-2px);box-shadow:0 10px 24px var(--arena-glow)}.v90-answer:active:not(:disabled){transform:scale(.992)}.v90-answer:disabled{cursor:default}.v90-answer>span{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:var(--theme-soft);color:var(--arena-accent);font-weight:900}.v90-answer b{font-size:13px;line-height:1.42;font-weight:760;overflow-wrap:anywhere}.v90-answer.correct{border-color:color-mix(in srgb,var(--arena-success) 58%,var(--arena-line));background:color-mix(in srgb,var(--arena-success) 9%,var(--arena-surface));box-shadow:0 0 0 3px color-mix(in srgb,var(--arena-success) 7%,transparent),0 12px 28px color-mix(in srgb,var(--arena-success) 10%,transparent);animation:v91Correct .38s ease}.v90-answer.correct>span{background:color-mix(in srgb,var(--arena-success) 14%,var(--arena-surface));color:var(--arena-success)}.v90-answer.wrong{border-color:color-mix(in srgb,var(--arena-danger) 55%,var(--arena-line));background:color-mix(in srgb,var(--arena-danger) 8%,var(--arena-surface));animation:v91Wrong .32s ease}.v90-answer.wrong>span{background:color-mix(in srgb,var(--arena-danger) 12%,var(--arena-surface));color:var(--arena-danger)}.v90-answer-feedback{margin-top:11px;min-height:44px;border-radius:13px;padding:10px 13px;background:color-mix(in srgb,var(--arena-surface-strong) 66%,transparent);border:1px solid color-mix(in srgb,var(--arena-line) 70%,transparent);display:flex;justify-content:space-between;gap:10px;align-items:center;color:var(--arena-muted);font-size:11px}.v90-answer-feedback strong{color:var(--arena-text)}.v90-answer-feedback.good{background:color-mix(in srgb,var(--arena-success) 8%,var(--arena-surface));border-color:color-mix(in srgb,var(--arena-success) 25%,var(--arena-line));color:var(--arena-success)}.v90-answer-feedback.good strong{color:var(--arena-success)}.v90-answer-feedback.bad{background:color-mix(in srgb,var(--arena-danger) 7%,var(--arena-surface));border-color:color-mix(in srgb,var(--arena-danger) 22%,var(--arena-line));color:var(--arena-danger)}.v90-answer-feedback.bad strong{color:var(--arena-danger)}.v91-feedback-burst{animation:v91Feedback .45s ease}

/* -------------------- Live leaderboard -------------------- */
.v90-battle-side{padding:13px;border-radius:20px;align-self:start;position:sticky;top:85px}.v90-board-head{display:flex;align-items:center;gap:9px;padding:6px 6px 11px}.v90-board-head>span{width:35px;height:35px;border-radius:11px;display:grid;place-items:center;background:var(--theme-soft);color:var(--arena-accent)}.v90-board-head .icon{width:18px}.v90-board-head small,.v90-board-head strong{display:block}.v90-board-head small{font-size:7px;color:var(--arena-muted);letter-spacing:.1em}.v90-board-head strong{color:var(--arena-text);font-size:13px}.v90-live-board{display:grid;gap:6px}.v90-live-row{display:grid;grid-template-columns:32px 1fr auto;align-items:center;gap:7px;padding:9px;border-radius:10px;background:color-mix(in srgb,var(--arena-surface-strong) 72%,transparent);border:1px solid transparent;font-size:11px;transition:.18s}.v90-live-row.me{background:color-mix(in srgb,var(--arena-accent) 8%,var(--arena-surface));border-color:var(--arena-line-strong);box-shadow:0 7px 18px var(--arena-glow)}.v90-live-row b{color:var(--arena-text)}.v90-live-row span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--arena-muted)}.v90-live-row strong{color:var(--arena-text)}.v90-self-card{margin-top:10px;border-radius:14px;padding:14px;background:linear-gradient(145deg,color-mix(in srgb,var(--arena-accent) 9%,var(--arena-surface)),color-mix(in srgb,var(--arena-accent-2) 8%,var(--arena-surface)));border:1px solid var(--arena-line);display:grid}.v90-self-card small{font-size:7px;letter-spacing:.11em;color:var(--arena-muted)}.v90-self-card strong{font-size:25px;color:var(--arena-text)}.v90-self-card span{font-size:10px;color:var(--arena-muted)}

/* -------------------- Results / Bảng vàng -------------------- */
.v90-results{position:relative;z-index:1;padding:38px 36px 42px;max-width:1180px;margin:0 auto}.v90-results:before,.v90-results:after{content:"";position:absolute;z-index:-1;border-radius:50%;filter:blur(50px);pointer-events:none}.v90-results:before{width:280px;height:280px;top:5%;left:0;background:color-mix(in srgb,var(--arena-accent) 12%,transparent)}.v90-results:after{width:240px;height:240px;top:14%;right:2%;background:color-mix(in srgb,var(--arena-accent-2) 10%,transparent)}.v90-results-hero{text-align:center}.v90-results-hero .eyebrow{color:var(--arena-gold);font-weight:900;letter-spacing:.14em}.v90-results-hero h1{font-size:clamp(36px,5.4vw,62px);color:var(--arena-text);margin:6px 0 8px;letter-spacing:-.04em;text-align:center}.v90-results-hero>p:last-of-type{color:var(--arena-muted);text-align:center}.v90-podium{display:flex;justify-content:center;align-items:end;gap:14px;margin:32px auto;max-width:760px}.v90-podium article{position:relative;width:190px;min-height:188px;border-radius:24px 24px 14px 14px;border:1px solid var(--arena-line);background:linear-gradient(180deg,color-mix(in srgb,var(--arena-surface) 97%,transparent),color-mix(in srgb,var(--arena-soft) 62%,var(--arena-surface)));padding:25px 16px 18px;display:grid;justify-items:center;align-content:center;gap:6px;box-shadow:0 16px 34px color-mix(in srgb,var(--ink) 7%,transparent);animation:v91PodiumIn .45s ease both}.v90-podium article.rank-1{min-height:230px;border-color:color-mix(in srgb,var(--arena-gold) 45%,var(--arena-line));background:linear-gradient(180deg,color-mix(in srgb,var(--arena-gold) 12%,var(--arena-surface)),var(--arena-surface));box-shadow:0 0 0 3px color-mix(in srgb,var(--arena-gold) 6%,transparent),0 18px 44px color-mix(in srgb,var(--arena-gold) 11%,transparent)}.v90-medal{position:absolute;top:-17px;font-size:31px;filter:drop-shadow(0 7px 10px color-mix(in srgb,var(--ink) 12%,transparent))}.v90-podium strong{color:var(--arena-text);text-align:center}.v90-podium small{color:var(--arena-muted);text-align:center}.v90-podium i{font-style:normal;color:var(--arena-muted);font-size:10px;text-align:center}.v90-results-grid{display:grid;grid-template-columns:minmax(0,1fr) 410px;gap:15px}.v90-result-self,.v90-final-board{border-radius:22px;background:color-mix(in srgb,var(--arena-surface) 96%,transparent);border:1px solid var(--arena-line);padding:21px;box-shadow:0 16px 36px color-mix(in srgb,var(--ink) 7%,transparent);backdrop-filter:blur(15px)}.v90-result-self{display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px}.v90-result-rank{width:72px;height:72px;border-radius:22px;display:grid;place-items:center;background:var(--theme-soft);border:1px solid var(--arena-line-strong);color:var(--arena-accent);font-size:27px;font-weight:900;box-shadow:0 10px 24px var(--arena-glow)}.v90-result-self>div:nth-child(2){text-align:center}.v90-result-self small{color:var(--arena-muted);font-size:8px;letter-spacing:.1em}.v90-result-self h2{color:var(--arena-text);margin:3px 0;text-align:center}.v90-result-metrics{width:100%;display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.v90-result-metrics span{padding:13px;border-radius:13px;background:color-mix(in srgb,var(--arena-surface-strong) 72%,transparent);border:1px solid var(--arena-line);text-align:center}.v90-result-metrics b,.v90-result-metrics small{display:block;text-align:center}.v90-result-metrics b{font-size:21px;color:var(--arena-text)}.v90-result-metrics small{margin-top:4px;color:var(--arena-muted)}.v90-xp-breakdown{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;padding:11px;background:color-mix(in srgb,var(--arena-gold) 8%,var(--arena-surface));border:1px solid color-mix(in srgb,var(--arena-gold) 22%,var(--arena-line));color:color-mix(in srgb,var(--arena-gold) 82%,var(--arena-text));font-size:11px;text-align:center}.v90-xp-breakdown .icon{width:15px}.v90-final-board h2{margin:0 0 12px;color:var(--arena-text);text-align:center}.v90-final-row{display:grid;grid-template-columns:34px 36px 1fr auto;align-items:center;gap:8px;padding:8px;border-radius:10px;border:1px solid transparent}.v90-final-row.me{background:color-mix(in srgb,var(--arena-accent) 8%,var(--arena-surface));border-color:var(--arena-line)}.v90-final-row>span strong,.v90-final-row>span small{display:block}.v90-final-row>span strong{color:var(--arena-text);font-size:11px}.v90-final-row>span small{color:var(--arena-muted);font-size:9px}.v90-final-row em{font-style:normal;color:var(--arena-text);font-weight:850}.v90-result-actions{display:flex;justify-content:center;gap:10px;margin-top:18px}.v90-results .btn.primary{background:linear-gradient(135deg,var(--arena-accent),var(--arena-accent-2));border:0;color:#fff;box-shadow:0 10px 26px var(--arena-glow)}
.v90-image-viewer{width:min(92vw,1100px);height:min(80vh,800px);display:grid;place-items:center;background:color-mix(in srgb,var(--bg) 65%,#000 35%);border-radius:18px;overflow:hidden}.v90-image-viewer img{width:100%;height:100%;object-fit:contain}

/* -------------------- Theme contrast tuning -------------------- */
[data-theme="dark"] .v90-arena-room,[data-theme="aurora"] .v90-arena-room{--arena-surface:color-mix(in srgb,var(--surface) 94%,var(--theme-accent) 6%);--arena-surface-strong:color-mix(in srgb,var(--surface-2) 88%,var(--theme-accent) 12%);--arena-line:color-mix(in srgb,var(--theme-accent) 28%,var(--line));--arena-line-strong:color-mix(in srgb,var(--theme-accent) 52%,var(--line))}
[data-theme="dark"] .v90-question-zone,[data-theme="dark"] .v90-battle-side,[data-theme="dark"] .v90-lobby-main,[data-theme="dark"] .v90-lobby-side>*,[data-theme="aurora"] .v90-question-zone,[data-theme="aurora"] .v90-battle-side,[data-theme="aurora"] .v90-lobby-main,[data-theme="aurora"] .v90-lobby-side>*{background:color-mix(in srgb,var(--surface) 92%,transparent)}

/* -------------------- Responsive -------------------- */
@media(max-width:1000px){
  .v90-arena-entry-hero{grid-template-columns:1fr;padding:34px}.v90-arena-emblem{display:none}
  .v90-lobby-grid{grid-template-columns:1fr}.v90-lobby-side{grid-template-columns:1fr 1fr}
  .v90-battle-layout{grid-template-columns:minmax(0,1fr) 235px;padding-inline:12px}.v90-hud-brand{min-width:190px}.v90-results-grid{grid-template-columns:1fr}.v90-final-board{order:2}
}
@media(max-width:780px){
  body.arena-focus .main{padding:0!important}.v90-arena-room{min-height:100dvh;border:0;border-radius:0}.v90-arena-stage,.v90-countdown,.v90-battle-shell{min-height:100dvh}
  .v90-arena-entry{gap:14px}.v90-arena-entry-hero{min-height:0;border-radius:22px;padding:25px 20px}.v90-arena-entry-copy h1{font-size:40px}.v90-arena-feature-row{display:grid;grid-template-columns:1fr 1fr}.v90-arena-feature-row span:last-child{grid-column:1/-1}.v90-arena-choice-grid{grid-template-columns:1fr}.v90-arena-choice{grid-template-columns:54px 1fr;padding:19px}.v90-arena-choice>i{width:54px;height:54px}.v90-arena-setup{padding:19px;border-radius:20px}.v90-choice-pills{grid-template-columns:repeat(2,minmax(0,1fr))}.v90-code-form{grid-template-columns:1fr}
  .v90-lobby-hero{grid-template-columns:1fr;padding:23px 16px 18px}.v90-lobby-hero h1{font-size:33px}.v90-room-code{min-width:0}.v90-lobby-grid{padding:14px 12px 24px}.v90-lobby-side{grid-template-columns:1fr}.v90-player-grid{grid-template-columns:1fr}.v90-player-card:hover .v90-kick{display:grid}
  .v90-battle-hud{padding:8px 9px;gap:7px}.v90-hud-brand{display:none}.v90-hud-metrics{margin:0;width:100%;grid-template-columns:repeat(4,1fr);gap:4px}.v90-hud-metrics>span{padding:6px 3px;border-radius:10px}.v90-hud-metrics small{font-size:5px}.v90-hud-metrics b{font-size:11px}.v91-connection{display:none}.v90-timebar{top:54px;height:4px}.v91-mobile-rankbar{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;padding:7px 8px;background:color-mix(in srgb,var(--arena-surface) 95%,transparent);border-bottom:1px solid var(--arena-line);font-size:8px;color:var(--arena-muted);position:sticky;top:58px;z-index:17;backdrop-filter:blur(16px)}.v91-mobile-rankbar>span{text-align:center;min-width:0;white-space:nowrap}.v91-mobile-rankbar b{color:var(--arena-text);display:block;font-size:10px}.v91-mobile-rankbar .status{display:flex;align-items:center;justify-content:center;gap:4px;flex-wrap:wrap}.v91-mobile-rankbar .status i{flex:none}
  .v90-battle-layout{display:block;padding:8px;max-width:none}.v90-question-zone{padding:15px 12px;min-height:calc(100dvh - 102px);border-radius:16px}.v90-question-kicker em{display:none}.v91-question-copy{max-height:32dvh;margin:13px 0 14px}.v91-question-text.q-short{font-size:24px;line-height:1.28}.v91-question-text.q-medium{font-size:21px;line-height:1.31}.v91-question-text.q-long{font-size:18.5px;line-height:1.36}.v91-question-text.q-xlong{font-size:17px;line-height:1.4}.v90-arena-images{max-height:215px}.v90-arena-image{min-height:105px}.v90-arena-image img{max-height:205px}.v90-answer-grid{grid-template-columns:1fr;gap:7px}.v90-answer{min-height:58px;border-radius:13px;padding:8px 10px;grid-template-columns:34px 1fr}.v90-answer>span{width:32px;height:32px}.v90-answer b{font-size:13px}.v90-answer-feedback{font-size:10px;min-height:40px;gap:6px}.v90-battle-side{display:none}
  .v90-results{padding:25px 12px 32px}.v90-results-hero h1{font-size:36px}.v90-podium{gap:6px;margin:26px -3px}.v90-podium article{width:31.5%;min-height:152px;padding:24px 7px 12px}.v90-podium article.rank-1{min-height:188px}.v90-podium strong{font-size:10px}.v90-podium small{font-size:9px}.v90-result-self,.v90-final-board{padding:15px}.v90-result-metrics{grid-template-columns:1fr 1fr}.v90-result-actions{flex-direction:column}.v90-result-actions .btn{width:100%;justify-content:center}
}
@media(max-width:390px){
  .v90-arena-entry-copy h1{font-size:35px}.v90-arena-choice{grid-template-columns:46px 1fr;padding:16px}.v90-arena-choice>i{width:46px;height:46px;border-radius:14px}.v90-player-state{font-size:8px;padding:5px 6px}.v91-mobile-rankbar{font-size:7px}.v91-mobile-rankbar b{font-size:9px}.v90-answer b{font-size:12px}.v90-results-hero h1{font-size:32px}
}

/* -------------------- Motion -------------------- */
@keyframes v91Ambient{from{transform:translate3d(0,0,0) scale(.95)}to{transform:translate3d(-18px,22px,0) scale(1.08)}}
@keyframes v91EmblemFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@keyframes v91LivePulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.55;transform:scale(.82)}}
@keyframes v91Orbit{to{transform:rotate(360deg)}}
@keyframes v91CountdownPop{from{transform:scale(.96);opacity:.86}to{transform:scale(1.04);opacity:1}}
@keyframes v91TimerPulse{from{filter:saturate(1)}to{filter:saturate(1.4) brightness(1.12)}}
@keyframes v91Correct{0%{transform:scale(.99)}55%{transform:scale(1.012)}100%{transform:none}}
@keyframes v91Wrong{0%,100%{transform:translateX(0)}35%{transform:translateX(-4px)}70%{transform:translateX(4px)}}
@keyframes v91RankUp{0%{transform:scale(1)}35%{transform:scale(1.08);box-shadow:0 0 22px color-mix(in srgb,var(--arena-gold) 28%,transparent)}100%{transform:scale(1)}}
@keyframes v91Combo{0%{transform:scale(.9);opacity:.4}60%{transform:scale(1.08)}100%{transform:scale(1);opacity:1}}
@keyframes v91Feedback{0%{transform:translateY(4px);opacity:.5}100%{transform:none;opacity:1}}
@keyframes v91PodiumIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){.v90-arena-entry-hero:after,.v90-arena-emblem,.v90-live-chip i,.v90-countdown-orbit,.v90-countdown>strong,.v90-timebar i,.v90-answer.correct,.v90-answer.wrong,.v91-rank-metric.rank-up,.v91-combo,.v91-feedback-burst,.v90-podium article{animation:none!important;transition:none!important}}
.v91-lobby-connection{display:inline-flex!important;align-items:center;gap:6px}.v91-lobby-connection i{width:7px;height:7px;border-radius:50%;background:var(--arena-muted)}.v91-lobby-connection.online{color:var(--arena-success)}.v91-lobby-connection.online i{background:var(--arena-success);box-shadow:0 0 9px color-mix(in srgb,var(--arena-success) 50%,transparent)}.v91-lobby-connection.reconnecting{color:var(--arena-warning)}.v91-lobby-connection.reconnecting i{background:var(--arena-warning);animation:v91LivePulse 1s infinite}.v91-lobby-connection.offline{color:var(--arena-danger)}.v91-lobby-connection.offline i{background:var(--arena-danger)}

/* -------------------- V9.3.0 Results alignment hotfix -------------------- */
.v90-results{
  width:min(1180px,100%);
  margin-inline:auto;
}
.v90-results-hero{
  width:100%;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:flex-start;
  text-align:center!important;
}
.v90-results-hero>.eyebrow,
.v90-results-hero>h1,
.v90-results-hero>p{
  display:block;
  width:100%;
  max-width:none;
  margin-left:auto!important;
  margin-right:auto!important;
  text-align:center!important;
}
.v90-results-hero>.eyebrow{
  margin-top:0;
  margin-bottom:4px;
}
.v90-results-hero>h1{
  text-wrap:balance;
}
.v90-results-hero>p:not(.eyebrow){
  margin-top:0;
  line-height:1.5;
}
.v90-podium{
  width:100%;
  margin-left:auto;
  margin-right:auto;
  justify-content:center;
  align-items:flex-end;
}
.v90-podium article{
  text-align:center!important;
  justify-items:center;
  justify-content:center;
}
.v90-podium article>*{
  margin-left:auto;
  margin-right:auto;
}
.v90-podium-avatar{
  width:100%;
  display:flex;
  justify-content:center;
  align-items:center;
}
.v90-podium strong,
.v90-podium small,
.v90-podium i{
  width:100%;
  text-align:center!important;
}
.v90-results-grid{
  grid-template-columns:minmax(0,1.5fr) minmax(360px,1fr);
  align-items:stretch;
}
.v90-result-self,
.v90-final-board{
  min-width:0;
}
.v90-result-self{
  justify-content:center;
  align-items:center;
  text-align:center!important;
}
.v90-result-self>div:nth-child(2){
  width:100%;
  display:grid;
  justify-items:center;
  align-items:center;
  text-align:center!important;
}
.v90-result-self>div:nth-child(2)>small,
.v90-result-self>div:nth-child(2)>h2{
  width:100%;
  text-align:center!important;
  margin-left:auto!important;
  margin-right:auto!important;
}
.v90-result-rank{
  align-self:center;
  justify-self:center;
  margin-left:auto;
  margin-right:auto;
  text-align:center!important;
}
.v90-result-metrics{
  justify-items:stretch;
  align-items:stretch;
}
.v90-result-metrics span{
  min-width:0;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  text-align:center!important;
}
.v90-result-metrics b,
.v90-result-metrics small{
  width:100%;
  text-align:center!important;
}
.v90-xp-breakdown{
  text-align:center!important;
  justify-content:center;
  flex-wrap:wrap;
}
.v90-final-board{
  display:flex;
  flex-direction:column;
  align-items:stretch;
}
.v90-final-board>h2{
  width:100%;
  margin-left:auto!important;
  margin-right:auto!important;
  text-align:center!important;
}
.v90-final-row{
  width:100%;
  grid-template-columns:34px 40px minmax(0,1fr) minmax(56px,auto);
  align-items:center;
}
.v90-final-row>b,
.v90-final-avatar,
.v90-final-row>em{
  align-self:center;
}
.v90-final-row>span{
  min-width:0;
  align-self:center;
  text-align:left;
}
.v90-final-row>span strong,
.v90-final-row>span small{
  width:100%;
  line-height:1.35;
}
.v90-final-row>em{
  justify-self:end;
  text-align:right;
  white-space:nowrap;
}
.v90-result-actions{
  width:100%;
  margin-left:auto;
  margin-right:auto;
  align-items:center;
  justify-content:center!important;
}
.v90-result-actions .btn{
  justify-content:center;
  text-align:center;
}

@media(max-width:1000px){
  .v90-results-grid{grid-template-columns:1fr}
}
@media(max-width:780px){
  .v90-results{width:100%;padding-left:12px;padding-right:12px}
  .v90-results-hero>.eyebrow,
  .v90-results-hero>h1,
  .v90-results-hero>p{padding-inline:4px}
  .v90-podium{width:100%;margin-left:auto;margin-right:auto}
  .v90-result-self>div:nth-child(2){width:100%}
  .v90-final-row{grid-template-columns:30px 36px minmax(0,1fr) minmax(48px,auto)}
  .v90-result-actions{align-items:stretch}
}