:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  font-synthesis: none;
  --arena-brand: #657954;
  --arena-brand-ink: #425333;
  --arena-bg: #f8fafc;
  --arena-bg-soft: #eef2ea;
  --arena-panel: rgba(255, 255, 255, 0.97);
  --arena-panel-solid: #ffffff;
  --arena-line: rgba(66, 83, 51, 0.2);
  --arena-line-strong: rgba(66, 83, 51, 0.38);
  --arena-text: #1e293b;
  --arena-muted: #526173;
  --arena-cyan: #2563eb;
  --arena-mint: #15803d;
  --arena-amber: #c2410c;
  --arena-magenta: #be185d;
  --arena-danger: #b91c1c;
  --arena-focus: #0f5fd7;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --shadow-panel: 0 20px 56px rgba(51, 65, 40, 0.14);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  background: var(--arena-bg);
  color: var(--arena-text);
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(48, 221, 244, 0.82);
  outline-offset: 3px;
}

button:active {
  transform: scale(0.97);
}

#collisionArenaHost {
  height: 100vh;
  min-height: 620px;
  overflow: hidden;
  background: var(--arena-bg);
}

#connectionBanner,
#controllerConnection {
  position: fixed;
  z-index: 1000;
  top: calc(0.75rem + var(--safe-top));
  left: 50%;
  padding: 0.58rem 0.9rem;
  border: 1px solid rgba(194, 65, 12, 0.4);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 8px 32px rgba(51, 65, 40, 0.16);
  color: #9a3412;
  font-size: 0.78rem;
  font-weight: 720;
  letter-spacing: 0.035em;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -12px);
  transition: opacity 180ms ease, transform 260ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

#connectionBanner.is-visible,
#controllerConnection.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

#connectionBanner.is-error,
#controllerConnection.is-error {
  border-color: rgba(185, 28, 28, 0.5);
  color: #991b1b;
}

#hostHeader {
  position: relative;
  z-index: 30;
  display: grid;
  grid-template-columns: minmax(230px, 1fr) auto minmax(260px, 1fr);
  align-items: center;
  height: 84px;
  padding: 0 1.15rem;
  border-bottom: 1px solid var(--arena-line);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(24px) saturate(150%);
}

#brandLockup {
  display: inline-flex;
  align-items: center;
  gap: 0.78rem;
  width: max-content;
  color: inherit;
  text-decoration: none;
}

#brandLockup > span:last-child {
  display: flex;
  flex-direction: column;
}

#brandLockup strong {
  font-size: 1rem;
  letter-spacing: 0.12em;
}

#brandLockup small {
  margin-top: 0.1rem;
  color: var(--arena-muted);
  font-size: 0.7rem;
  font-weight: 650;
  letter-spacing: 0.13em;
}

#brandMark,
.controller-brand > span {
  position: relative;
  display: grid;
  place-items: center;
  width: 42px;
  aspect-ratio: 1;
  border: 2px solid rgba(66, 83, 51, 0.46);
  border-radius: 50%;
  background: #eef2ea;
}

#brandMark i,
.controller-brand i {
  position: absolute;
  display: block;
  width: 9px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--arena-brand);
}

#brandMark i:nth-child(1),
.controller-brand i:nth-child(1) {
  transform: translate(-9px, 7px) scale(0.72);
}

#brandMark i:nth-child(2),
.controller-brand i:nth-child(2) {
  transform: translate(8px, 8px) scale(0.58);
}

#brandMark i:nth-child(3),
.controller-brand i:nth-child(3) {
  transform: translate(1px, -8px);
}

#roomSummary {
  display: grid;
  grid-template-columns: auto auto auto;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--arena-line);
  border-radius: 16px;
  background: #f4f7f1;
}

#roomSummary > span:first-child {
  color: var(--arena-muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

#roomCode {
  color: var(--arena-brand-ink);
  font-variant-numeric: tabular-nums;
  font-size: 2.5rem;
  letter-spacing: 0.17em;
}

#roomPhase {
  padding-left: 0.72rem;
  border-left: 1px solid var(--arena-line);
  color: #334155;
  font-size: 0.86rem;
  font-weight: 720;
}

#hostMetrics {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

#hostMetrics div {
  display: grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  gap: 0.42rem;
  min-width: 78px;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--arena-line);
  border-radius: 13px;
  background: #f8fafc;
}

#hostMetrics span {
  color: var(--arena-muted);
  font-size: 0.68rem;
  font-weight: 650;
}

#hostMetrics strong {
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

#classPerformance[data-warning="true"] {
  color: #b91c1c;
}

#hostLayout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  height: calc(100vh - 84px);
  min-height: 536px;
}

#arenaStage {
  position: relative;
  min-width: 0;
  overflow: hidden;
  border-right: 1px solid var(--arena-line);
  isolation: isolate;
}

#arenaCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

#arenaVignette {
  position: absolute;
  z-index: 2;
  inset: 0;
  background: radial-gradient(circle at center, transparent 48%, rgba(66, 83, 51, 0.12) 120%);
  pointer-events: none;
}

#arenaStage.is-lobby #arenaVignette {
  background:
    linear-gradient(rgba(248, 250, 252, 0.18), rgba(248, 250, 252, 0.18)),
    url("assets/mass-clash-arena-key-visual.webp") center / cover no-repeat;
  opacity: 0.42;
}

#simWatermark {
  position: absolute;
  z-index: 14;
  right: 1rem;
  bottom: 0.7rem;
  color: rgba(51, 65, 85, 0.64);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  pointer-events: none;
}

#lobbyOverlay,
#resultOverlay {
  position: absolute;
  z-index: 10;
  inset: 0;
  display: grid;
  align-content: center;
  padding: 2rem;
  background: rgba(248, 250, 252, 0.62);
  transition: opacity 240ms ease, visibility 240ms ease;
}

#lobbyOverlay.is-hidden,
#resultOverlay:not(.is-visible) {
  visibility: hidden;
  opacity: 0;
}

#lobbyHeadline {
  max-width: 560px;
}

#lobbyOverlay {
  grid-template-columns: minmax(360px, 1fr) 330px;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding: 2rem clamp(2rem, 5vw, 4.5rem);
}

#lobbyEyebrow,
#resultKicker,
#roundBannerKicker {
  color: var(--arena-cyan);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.18em;
}

#lobbyHeadline h1,
#resultOverlay h2 {
  margin: 0.85rem 0 0.75rem;
  font-size: clamp(2.25rem, 4vw, 3.75rem);
  line-height: 1.04;
  letter-spacing: -0.045em;
}

#lobbyHeadline p,
#resultOverlay p {
  margin: 0;
  color: #475569;
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  line-height: 1.7;
}

#lobbyItemGuide {
  max-width: 540px;
  margin-top: 1.15rem;
  padding: 0.75rem;
  border: 1px solid rgba(66, 83, 51, 0.2);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 12px 34px rgba(51, 65, 40, 0.1);
  backdrop-filter: blur(14px);
}

#lobbyItemGuide > strong {
  display: block;
  margin: 0 0 0.55rem;
  color: var(--arena-brand-ink);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

.item-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.42rem;
}

.item-guide-grid > div {
  display: flex;
  align-items: center;
  gap: 0.52rem;
  min-width: 0;
  padding: 0.42rem 0.48rem;
  border-radius: 12px;
  background: rgba(238, 242, 234, 0.72);
}

.item-guide-grid p {
  display: flex;
  flex-direction: column;
  min-width: 0;
  margin: 0 !important;
  line-height: 1.25 !important;
}

.item-guide-grid p strong {
  color: #1e293b;
  font-size: 0.68rem;
}

.item-guide-grid p small {
  margin-top: 0.12rem;
  color: var(--arena-muted);
  font-size: 0.56rem;
}

.item-guide-icon {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 28px;
  aspect-ratio: 1;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px currentColor;
  color: #fff;
  font-style: normal;
  font-size: 0.72rem;
  font-weight: 900;
  line-height: 1;
}

.item-guide-icon[data-item="mass-up"] {
  border-radius: 8px;
  background: #15803d;
  clip-path: polygon(25% 7%, 75% 7%, 100% 50%, 75% 93%, 25% 93%, 0 50%);
}

.item-guide-icon[data-item="mass-down"] {
  border-radius: 7px;
  background: #7c3aed;
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.item-guide-icon[data-item="inelastic"] {
  background: #c2410c;
}

.item-guide-icon[data-item="shield"] {
  border-color: #cffafe;
  background: #0891b2;
  box-shadow: 0 0 0 2px #22d3ee;
}

.item-guide-icon[data-item="superelastic"] {
  border-radius: 8px;
  background: #d97706;
  clip-path: polygon(50% 0, 64% 18%, 85% 15%, 82% 36%, 100% 50%, 82% 64%, 85% 85%, 64% 82%, 50% 100%, 36% 82%, 15% 85%, 18% 64%, 0 50%, 18% 36%, 15% 15%, 36% 18%);
}

.item-guide-icon[data-item="capture"] {
  background: #be185d;
}

#lobbyStatus {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  width: max-content;
  max-width: 100%;
  margin-top: 1.5rem;
  padding: 0.82rem 1.05rem;
  border: 1px solid var(--arena-line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(20px);
}

#lobbyStatus > span:last-child {
  color: var(--arena-muted);
  font-size: 0.76rem;
}

#lobbyPulse {
  width: 9px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--arena-mint);
  box-shadow: 0 0 0 6px rgba(21, 128, 61, 0.12);
}

#lobbyJoinCard {
  display: grid;
  justify-items: center;
  padding: 1rem;
  border: 1px solid var(--arena-line-strong);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-panel);
  text-align: center;
}

#lobbyQrFrame {
  position: relative;
  display: grid;
  place-items: center;
  width: 320px;
  max-width: 100%;
  aspect-ratio: 1;
  background: #fff;
}

#lobbyQrImage {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

#lobbyQrImage:not([src]) {
  visibility: hidden;
}

#lobbyQrUnavailable {
  position: absolute;
  color: #1e293b;
  font-size: 2rem;
  font-weight: 900;
}

#lobbyQrImage[src] + #lobbyQrUnavailable {
  display: none;
}

#lobbyJoinCard > span {
  margin-top: 0.4rem;
  color: var(--arena-muted);
  font-size: 0.88rem;
  font-weight: 720;
}

#lobbyRoomCode {
  color: var(--arena-brand-ink);
  font-size: 2.5rem;
  letter-spacing: 0.18em;
}

#lobbyJoinCard small {
  margin-top: 0.2rem;
  color: var(--arena-muted);
  font-size: 0.82rem;
}

#countdownOverlay {
  position: absolute;
  z-index: 40;
  inset: 0;
  display: grid;
  place-content: center;
  visibility: hidden;
  background: rgba(248, 250, 252, 0.9);
  opacity: 0;
  text-align: center;
  backdrop-filter: blur(6px);
}

#countdownOverlay.is-visible {
  visibility: visible;
  opacity: 1;
}

#countdownLabel {
  color: #334155;
  font-size: 0.88rem;
  font-weight: 780;
  letter-spacing: 0.18em;
}

#countdownValue {
  margin-top: 0.3rem;
  color: var(--arena-cyan);
  font-size: clamp(7rem, 20vw, 15rem);
  line-height: 0.95;
  text-shadow: none;
}

#roundBanner {
  position: absolute;
  z-index: 28;
  top: 1rem;
  left: 50%;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 250px;
  padding: 0.65rem 1rem;
  border: 1px solid rgba(185, 28, 28, 0.42);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-panel);
  visibility: hidden;
  opacity: 0;
  text-align: center;
  transform: translate(-50%, -10px);
  transition: opacity 180ms ease, transform 220ms ease;
}

#roundBanner.is-visible {
  visibility: visible;
  opacity: 1;
  transform: translate(-50%, 0);
}

#roundBannerKicker {
  color: var(--arena-danger);
}

#roundBannerTitle {
  font-size: 0.92rem;
}

#matchHud {
  position: absolute;
  z-index: 12;
  top: 1rem;
  left: 1rem;
  display: flex;
  overflow: hidden;
  border: 1px solid var(--arena-line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(18px);
}

#matchHud div {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 92px;
  padding: 0.62rem 0.78rem;
  border-right: 1px solid var(--arena-line);
}

#matchHud div:last-child {
  border-right: 0;
}

#matchHud span,
#leaderboard header span,
#leaderboard header small {
  color: var(--arena-muted);
  font-size: 0.875rem;
  font-weight: 670;
  letter-spacing: 0.04em;
}

#matchHud strong {
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
}

#leaderboard {
  position: absolute;
  z-index: 12;
  top: 1rem;
  right: 1rem;
  width: 210px;
  overflow: hidden;
  border: 1px solid var(--arena-line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(18px);
}

#leaderboard header {
  display: flex;
  justify-content: space-between;
  padding: 0.62rem 0.75rem 0.48rem;
}

#leaderboardList {
  display: grid;
  gap: 0.23rem;
  margin: 0;
  padding: 0 0.42rem 0.48rem;
  list-style: none;
}

#leaderboardList li {
  display: grid;
  grid-template-columns: 1.1rem 1.7rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.38rem;
  padding: 0.36rem 0.42rem;
  border-radius: 9px;
  background: rgba(148, 178, 211, 0.065);
  font-size: 0.875rem;
}

#leaderboardList li > span:nth-child(2) {
  display: grid;
  place-items: center;
  width: 1.55rem;
  aspect-ratio: 1;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--player-color, var(--arena-cyan));
  box-shadow: 0 0 0 1px #334155;
  color: #fff;
  font-size: 0.52rem;
  font-weight: 900;
  text-shadow: 0 1px 2px #0f172a;
}

.leaderboard-identity[data-pattern="0"] {
  background:
    radial-gradient(circle, transparent 0 24%, rgba(255, 255, 255, 0.88) 26% 36%, transparent 38%),
    var(--player-color);
}

.leaderboard-identity[data-pattern="1"] {
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.82) 0 2px, transparent 2px 5px),
    var(--player-color);
}

.leaderboard-identity[data-pattern="2"] {
  background:
    radial-gradient(circle at 50% 25%, white 0 1.5px, transparent 2px),
    radial-gradient(circle at 31% 63%, white 0 1.5px, transparent 2px),
    radial-gradient(circle at 69% 63%, white 0 1.5px, transparent 2px),
    var(--player-color);
}

.leaderboard-identity[data-pattern="3"] {
  background:
    linear-gradient(transparent 44%, white 45% 55%, transparent 56%),
    linear-gradient(90deg, transparent 44%, white 45% 55%, transparent 56%),
    var(--player-color);
}

.leaderboard-identity[data-pattern="4"] {
  background:
    linear-gradient(45deg, transparent 40%, white 41% 59%, transparent 60%),
    linear-gradient(-45deg, transparent 40%, white 41% 59%, transparent 60%),
    var(--player-color);
}

#leaderboardList li > span:nth-child(3) {
  overflow: hidden;
  font-weight: 690;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#leaderboardList li strong {
  color: #1e293b;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

#eventFeed {
  position: absolute;
  z-index: 16;
  left: 1rem;
  bottom: 1rem;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.38rem;
  width: min(360px, 42vw);
  pointer-events: none;
}

#matchItemGuide {
  position: absolute;
  z-index: 13;
  right: 1rem;
  bottom: 1rem;
  width: min(390px, calc(100% - 2rem));
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--arena-line);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(16px);
}

#arenaStage.is-lobby #matchItemGuide {
  display: none;
}

#matchItemGuide > strong {
  color: var(--arena-brand-ink);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
}

#matchItemGuide > div {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 0.42rem;
  margin-top: 0.34rem;
}

#matchItemGuide span {
  display: flex;
  align-items: center;
  gap: 0.26rem;
  color: #334155;
  font-size: 0.61rem;
  font-weight: 700;
  white-space: nowrap;
}

#matchItemGuide .item-guide-icon {
  width: 20px;
  border-width: 1.5px;
  font-size: 0.52rem;
}

.event-toast {
  width: max-content;
  max-width: 100%;
  padding: 0.52rem 0.72rem;
  border-left: 3px solid var(--event-color, var(--arena-cyan));
  border-radius: 6px 12px 12px 6px;
  background: rgba(255, 255, 255, 0.98);
  color: #1e293b;
  font-size: 0.875rem;
  font-weight: 650;
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.26);
  backdrop-filter: blur(14px);
}

#resultOverlay {
  z-index: 36;
  justify-items: center;
  background: rgba(248, 250, 252, 0.96);
  text-align: center;
}

#resultOverlay.is-visible {
  visibility: visible;
  opacity: 1;
}

#winnerCore,
#spectatorCore {
  width: 88px;
  aspect-ratio: 1;
  margin: 1rem 0 0.75rem;
  border: 4px solid #fff;
  border-radius: 50%;
  background:
    radial-gradient(circle at 40% 35%, white 0 4%, transparent 5%),
    radial-gradient(circle, var(--winner-color, var(--arena-cyan)) 0 34%, rgba(48, 221, 244, 0.24) 35% 58%, transparent 59%);
  box-shadow: 0 12px 30px rgba(51, 65, 40, 0.2);
}

#winnerName {
  font-size: 1.6rem;
}

#nextRoundButton {
  margin-top: 1.25rem;
  padding: 0.78rem 1.2rem;
  border: 1px solid var(--arena-brand);
  border-radius: 13px;
  background: #eef2ea;
  color: var(--arena-brand-ink);
  font-weight: 760;
  cursor: pointer;
}

#hostPanel {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
  background: rgba(255, 255, 255, 0.98);
}

#joinCard {
  display: none;
  justify-items: center;
  padding: 1rem;
  border-bottom: 1px solid var(--arena-line);
}

#qrFrame {
  position: relative;
  display: grid;
  place-items: center;
  width: 154px;
  aspect-ratio: 1;
  padding: 10px;
  border-radius: 15px;
  background: white;
  box-shadow: 0 12px 42px rgba(0, 0, 0, 0.26);
}

#qrImage {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

#qrImage:not([src]) {
  visibility: hidden;
}

#qrUnavailable {
  position: absolute;
  color: #0d1b2d;
  font-weight: 900;
  letter-spacing: 0.08em;
}

#qrImage[src] + #qrUnavailable {
  display: none;
}

#joinCard p {
  margin: 0.72rem 0 0.18rem;
  color: var(--arena-muted);
  font-size: 0.7rem;
  font-weight: 650;
}

#joinUrl {
  display: block;
  max-width: 100%;
  overflow: hidden;
  color: #dcecf5;
  font-size: 0.72rem;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#rosterSection {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
}

#rosterSection > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--arena-line);
}

#rosterSection > header > div {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
}

#rosterActions {
  display: flex;
  gap: 0.35rem;
}

#rosterSection > header span {
  font-size: 0.78rem;
  font-weight: 760;
}

#rosterCapacity {
  color: var(--arena-muted);
  font-size: 0.68rem;
}

#copyJoinButton,
#audioToggle {
  padding: 0.38rem 0.58rem;
  border: 1px solid var(--arena-line-strong);
  border-radius: 9px;
  background: #f8fafc;
  color: #334155;
  font-size: 0.75rem;
  font-weight: 680;
  cursor: pointer;
}

#playerGrid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  align-content: start;
  gap: 0.25rem;
  overflow-y: auto;
  padding: 0.55rem;
  scrollbar-color: rgba(66, 83, 51, 0.28) transparent;
}

.player-cell {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 0.16rem;
  min-width: 0;
  padding: 0.3rem 0.15rem;
  border: 1px solid var(--arena-line);
  border-radius: 12px;
  background: #f8fafc;
}

.player-cell[data-ready="true"] {
  border-color: rgba(21, 128, 61, 0.42);
  background: rgba(21, 128, 61, 0.06);
}

.player-cell[data-bot="true"] {
  border-style: dashed;
}

.player-cell[data-bot="true"] .player-cell-name::after {
  margin-left: 0.18rem;
  color: #64748b;
  content: "BOT";
  font-size: 0.46rem;
  letter-spacing: 0.04em;
  vertical-align: top;
}

.player-cell-core {
  position: relative;
  display: grid;
  place-items: center;
  width: 25px;
  aspect-ratio: 1;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--player-color, var(--arena-cyan));
  box-shadow: 0 0 0 1px #334155;
}

.player-cell-core[data-pattern="0"] {
  background:
    radial-gradient(circle, transparent 0 26%, rgba(255, 255, 255, 0.92) 28% 39%, transparent 41%),
    var(--player-color, var(--arena-cyan));
}

.player-cell-core[data-pattern="1"] {
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0 2px, transparent 2px 6px),
    var(--player-color, var(--arena-cyan));
}

.player-cell-core[data-pattern="2"] {
  background:
    radial-gradient(circle at 50% 24%, white 0 2px, transparent 2.5px),
    radial-gradient(circle at 31% 63%, white 0 2px, transparent 2.5px),
    radial-gradient(circle at 69% 63%, white 0 2px, transparent 2.5px),
    var(--player-color, var(--arena-cyan));
}

.player-cell-core[data-pattern="3"] {
  background:
    linear-gradient(transparent 43%, white 44% 56%, transparent 57%),
    linear-gradient(90deg, transparent 43%, white 44% 56%, transparent 57%),
    var(--player-color, var(--arena-cyan));
}

.player-cell-core[data-pattern="4"] {
  background:
    linear-gradient(45deg, transparent 37%, white 38% 62%, transparent 63%),
    linear-gradient(-45deg, transparent 37%, white 38% 62%, transparent 63%),
    var(--player-color, var(--arena-cyan));
}

.player-cell-code {
  position: relative;
  z-index: 1;
  color: #fff;
  font-size: 0.55rem;
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 1px 2px rgba(15, 23, 42, 0.75);
}

.player-cell-core::after {
  position: absolute;
  right: -5px;
  bottom: -4px;
  display: grid;
  place-items: center;
  width: 13px;
  aspect-ratio: 1;
  border: 2px solid var(--arena-panel-solid);
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 1px #64748b;
  color: #334155;
  content: "○";
  font-size: 0.56rem;
  font-weight: 900;
  line-height: 1;
}

.player-cell[data-ready="true"] .player-cell-core::after {
  background: var(--arena-mint);
  box-shadow: 0 0 0 1px #166534;
  color: #fff;
  content: "✓";
}

.player-cell-name {
  width: 100%;
  overflow: hidden;
  color: #1e293b;
  font-size: 0.875rem;
  font-weight: 690;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#hostActions {
  display: grid;
  gap: 0.5rem;
  padding: 0.8rem;
  border-top: 1px solid var(--arena-line);
  background: #f8fafc;
}

#startHint {
  margin: 0 0 0.2rem;
  color: var(--arena-muted);
  font-size: 0.8rem;
  line-height: 1.45;
}

#hostActions button,
#confirmCloseDialog button {
  min-height: 42px;
  border: 1px solid var(--arena-line-strong);
  border-radius: 12px;
  background: #fff;
  font-size: 0.875rem;
  font-weight: 740;
  cursor: pointer;
}

#startButton {
  border-color: var(--arena-brand) !important;
  background: var(--arena-brand) !important;
  box-shadow: 0 9px 24px rgba(66, 83, 51, 0.14);
  color: #fff;
}

#botFillButton {
  border-color: rgba(37, 99, 235, 0.34) !important;
  background: rgba(37, 99, 235, 0.07) !important;
  color: #1d4ed8;
}

#botFillButton:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

#startButton:disabled,
#cancelButton:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

#closeRoomButton {
  min-height: 34px !important;
  border-color: rgba(185, 28, 28, 0.28) !important;
  color: #991b1b;
}

#confirmCloseDialog {
  width: min(430px, calc(100vw - 2rem));
  padding: 0;
  border: 1px solid var(--arena-line-strong);
  border-radius: 22px;
  background: #fff;
  color: var(--arena-text);
  box-shadow: 0 30px 120px rgba(0, 0, 0, 0.6);
}

#confirmCloseDialog::backdrop {
  background: rgba(30, 41, 59, 0.38);
  backdrop-filter: blur(5px);
}

#confirmCloseDialog form {
  padding: 1.4rem;
}

#confirmCloseDialog form > span {
  color: var(--arena-danger);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

#confirmCloseDialog h2 {
  margin: 0.55rem 0;
  font-size: 1.35rem;
  letter-spacing: -0.025em;
}

#confirmCloseDialog p {
  margin: 0;
  color: var(--arena-muted);
  font-size: 0.82rem;
  line-height: 1.6;
}

#confirmCloseDialog form > div {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: 1.2rem;
}

#confirmCloseButton {
  border-color: rgba(185, 28, 28, 0.48) !important;
  background: rgba(185, 28, 28, 0.08) !important;
  color: #991b1b;
}

/* Controller */

.arena-sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

#collisionArenaController {
  min-height: 100svh;
  overflow: hidden;
  overscroll-behavior: none;
  background:
    radial-gradient(circle at 50% -20%, rgba(101, 121, 84, 0.16), transparent 43%),
    radial-gradient(circle at 110% 90%, rgba(37, 99, 235, 0.08), transparent 38%),
    var(--arena-bg);
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

#controllerApp {
  width: 100%;
  min-height: 100svh;
}

.controller-screen {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  padding:
    calc(1rem + var(--safe-top))
    calc(1rem + var(--safe-right))
    calc(1rem + var(--safe-bottom))
    calc(1rem + var(--safe-left));
}

.controller-screen.is-active {
  display: flex;
}

.controller-card {
  width: min(100%, 420px);
  padding: clamp(1.25rem, 5vw, 1.8rem);
  border: 1px solid var(--arena-line-strong);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-panel);
}

.controller-card-wide {
  width: min(100%, 480px);
}

.entry-card {
  overflow: hidden;
  background:
    linear-gradient(rgba(255, 255, 255, 0.87), rgba(255, 255, 255, 0.94)),
    url("assets/mass-clash-arena-key-visual.webp") center / cover no-repeat;
}

.entry-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: 96px;
  margin: 1rem 0;
}

.entry-preview span {
  width: 38px;
  aspect-ratio: 1;
  border: 4px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #334155;
}

.entry-preview span:nth-child(1) {
  background: #1d4ed8;
}

.entry-preview span:nth-child(2) {
  align-self: flex-start;
  background: #0f766e;
}

.entry-preview span:nth-child(3) {
  width: 54px;
  background: #a16207;
}

.entry-preview span:nth-child(4) {
  align-self: flex-end;
  background: #be123c;
}

.entry-preview span:nth-child(5) {
  background: #6d28d9;
}

.arena-entry-actions {
  display: grid;
  gap: 0.65rem;
}

.controller-link {
  display: grid;
  place-items: center;
  min-height: 54px;
  text-decoration: none;
}

.controller-link.controller-secondary {
  margin-top: 0;
}

.controller-brand {
  display: flex;
  align-items: center;
  gap: 0.68rem;
}

.controller-brand > span {
  width: 38px;
}

.controller-brand strong {
  font-size: 0.88rem;
  letter-spacing: 0.14em;
}

.controller-kicker {
  margin: 1.25rem 0 0.38rem;
  color: var(--arena-brand-ink);
  font-size: 0.7rem;
  font-weight: 780;
  letter-spacing: 0.14em;
}

.controller-card h1 {
  margin: 0;
  font-size: clamp(1.7rem, 8vw, 2.45rem);
  line-height: 1.06;
  letter-spacing: -0.04em;
}

.controller-intro {
  margin: 0.7rem 0 1.35rem;
  color: var(--arena-muted);
  font-size: 0.86rem;
  line-height: 1.65;
}

.controller-field {
  display: grid;
  gap: 0.42rem;
  margin-top: 0.9rem;
}

.controller-field span {
  color: #334155;
  font-size: 0.72rem;
  font-weight: 680;
}

.controller-field input {
  width: 100%;
  min-height: 52px;
  padding: 0 0.9rem;
  border: 1px solid var(--arena-line-strong);
  border-radius: 14px;
  background: #fff;
  color: var(--arena-text);
  font-size: 1rem;
  font-weight: 690;
  outline: none;
}

#roomInput {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.controller-field input::placeholder {
  color: #7c8798;
  font-weight: 560;
  letter-spacing: 0;
}

.controller-error {
  min-height: 1.2rem;
  margin: 0.65rem 0 0;
  color: #b91c1c;
  font-size: 0.74rem;
  font-weight: 650;
}

.controller-primary,
.controller-secondary {
  width: 100%;
  min-height: 54px;
  border-radius: 15px;
  font-weight: 780;
  cursor: pointer;
}

.controller-primary {
  border: 1px solid var(--arena-brand);
  background: var(--arena-brand);
  box-shadow: 0 12px 30px rgba(66, 83, 51, 0.16);
  color: #fff;
}

.controller-primary:disabled {
  border-color: var(--arena-line);
  background: rgba(148, 178, 211, 0.1);
  box-shadow: none;
  color: var(--arena-muted);
  cursor: not-allowed;
}

.controller-secondary {
  margin-top: 0.55rem;
  border: 1px solid var(--arena-line-strong);
  background: transparent;
  color: #334155;
}

.controller-footnote {
  margin: 0.85rem 0 0;
  color: #64748b;
  font-size: 0.66rem;
  line-height: 1.5;
  text-align: center;
}

#identityPreview {
  display: flex;
  align-items: center;
  gap: 1rem;
}

#identityPreview .controller-kicker {
  margin: 0 0 0.3rem;
}

#identityPreview h1 {
  font-size: 1.6rem;
}

#playerIdentity {
  display: block;
  margin-top: 0.35rem;
  color: var(--arena-muted);
  font-size: 0.78rem;
}

#identityCore {
  position: relative;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 82px;
  aspect-ratio: 1;
  border: 4px solid #fff;
  border-radius: 50%;
  background: var(--player-color, var(--arena-cyan));
  box-shadow: 0 0 0 2px #334155, 0 12px 26px rgba(51, 65, 85, 0.2);
}

#identityCore[data-pattern="0"] {
  background:
    radial-gradient(circle, transparent 0 25%, white 26% 36%, transparent 37%),
    var(--player-color);
}

#identityCore[data-pattern="1"] {
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0 5px, transparent 5px 11px),
    var(--player-color);
}

#identityCore[data-pattern="2"] {
  background:
    radial-gradient(circle at 50% 25%, white 0 7px, transparent 8px),
    radial-gradient(circle at 30% 64%, white 0 7px, transparent 8px),
    radial-gradient(circle at 70% 64%, white 0 7px, transparent 8px),
    var(--player-color);
}

#identityCore[data-pattern="3"] {
  background:
    linear-gradient(transparent 43%, white 44% 56%, transparent 57%),
    linear-gradient(90deg, transparent 43%, white 44% 56%, transparent 57%),
    var(--player-color);
}

#identityCore[data-pattern="4"] {
  background:
    linear-gradient(45deg, transparent 39%, white 40% 60%, transparent 61%),
    linear-gradient(-45deg, transparent 39%, white 40% 60%, transparent 61%),
    var(--player-color);
}

#identityCore span {
  display: grid;
  place-items: center;
  width: 28px;
  aspect-ratio: 1;
  border: 2px solid #fff;
  border-radius: 50%;
  background: rgba(30, 41, 59, 0.32);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 900;
  text-shadow: 0 1px 2px #0f172a;
}

#playerStats,
#spectatorStats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin: 1.3rem 0 1rem;
}

#playerStats div,
#spectatorStats div {
  display: grid;
  justify-items: center;
  padding: 0.78rem 0.4rem;
  border: 1px solid var(--arena-line);
  border-radius: 14px;
  background: #f8fafc;
}

#playerStats span,
#spectatorStats span {
  color: var(--arena-muted);
  font-size: 0.63rem;
  font-weight: 650;
}

#playerStats strong,
#spectatorStats strong {
  margin-top: 0.24rem;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

#playerStats small {
  color: #8198ad;
  font-size: 0.58rem;
}

#controllerItemGuide {
  margin: 0 0 0.75rem;
  padding: 0.7rem;
  border: 1px solid var(--arena-line);
  border-radius: 16px;
  background: #f8fafc;
}

#controllerItemGuide > header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

#controllerItemGuide > header strong {
  color: var(--arena-brand-ink);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}

#controllerItemGuide > header small {
  color: var(--arena-muted);
  font-size: 0.6rem;
}

#readyStatus,
#controlState {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin: 0.5rem 0 1rem;
  padding: 0.78rem 0.9rem;
  border: 1px solid var(--arena-line);
  border-radius: 15px;
  background: #f8fafc;
}

#readyStatus > span,
#controlStateIcon {
  flex: 0 0 auto;
  width: 12px;
  aspect-ratio: 1;
  border: 2px solid #70879b;
  border-radius: 50%;
}

#readyStatus.is-ready > span {
  border-color: var(--arena-mint);
  background: var(--arena-mint);
  box-shadow: 0 0 0 4px rgba(21, 128, 61, 0.12);
}

#readyStatus p,
#controlState p {
  display: flex;
  flex-direction: column;
  gap: 0.13rem;
  margin: 0;
}

#readyStatus strong,
#controlState strong {
  font-size: 0.8rem;
}

#readyStatus small,
#controlState small {
  color: var(--arena-muted);
  font-size: 0.68rem;
  line-height: 1.4;
}

#controlScreen {
  display: none;
  align-items: stretch;
  justify-content: stretch;
  overflow: hidden;
  padding: 0;
  touch-action: none;
}

#controlScreen.is-active {
  display: grid;
  grid-template-rows: auto minmax(168px, 1.25fr) auto minmax(155px, 0.9fr) auto;
}

#controlHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding:
    calc(0.75rem + var(--safe-top))
    calc(0.9rem + var(--safe-right))
    0.72rem
    calc(0.9rem + var(--safe-left));
  border-bottom: 1px solid var(--arena-line);
  background: #fff;
}

#controlHeader > div:first-child {
  display: flex;
  align-items: center;
  gap: 0.64rem;
  min-width: 0;
}

#controlPlayerDot {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 30px;
  aspect-ratio: 1;
  border: 2px solid white;
  border-radius: 50%;
  background: var(--player-color, var(--arena-cyan));
  box-shadow: 0 0 0 1px #334155;
  color: #fff;
  font-size: 0.58rem;
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 1px 2px rgba(15, 23, 42, 0.82);
}

#controlPlayerDot[data-pattern="0"] {
  background:
    radial-gradient(circle, transparent 0 26%, rgba(255, 255, 255, 0.84) 28% 38%, transparent 40%),
    var(--player-color, var(--arena-cyan));
}

#controlPlayerDot[data-pattern="1"] {
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.78) 0 2px, transparent 2px 7px),
    var(--player-color, var(--arena-cyan));
}

#controlPlayerDot[data-pattern="2"] {
  background:
    radial-gradient(circle at 50% 24%, rgba(255, 255, 255, 0.9) 0 2px, transparent 2.5px),
    radial-gradient(circle at 31% 63%, rgba(255, 255, 255, 0.9) 0 2px, transparent 2.5px),
    radial-gradient(circle at 69% 63%, rgba(255, 255, 255, 0.9) 0 2px, transparent 2.5px),
    var(--player-color, var(--arena-cyan));
}

#controlPlayerDot[data-pattern="3"] {
  background:
    linear-gradient(transparent 43%, rgba(255, 255, 255, 0.82) 44% 56%, transparent 57%),
    linear-gradient(90deg, transparent 43%, rgba(255, 255, 255, 0.82) 44% 56%, transparent 57%),
    var(--player-color, var(--arena-cyan));
}

#controlPlayerDot[data-pattern="4"] {
  background:
    linear-gradient(45deg, transparent 37%, rgba(255, 255, 255, 0.82) 38% 62%, transparent 63%),
    linear-gradient(-45deg, transparent 37%, rgba(255, 255, 255, 0.82) 38% 62%, transparent 63%),
    var(--player-color, var(--arena-cyan));
}

#controlHeader p {
  display: flex;
  flex-direction: column;
  gap: 0.08rem;
  min-width: 0;
  margin: 0;
}

#controlHeader small {
  color: var(--arena-muted);
  font-size: 0.62rem;
}

#controlHeader strong {
  overflow: hidden;
  font-size: 0.82rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#controlConnectionQuality {
  display: flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.35rem 0.52rem;
  border: 1px solid var(--arena-line);
  border-radius: 999px;
  background: #f8fafc;
}

#controlConnectionQuality > span {
  width: 7px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--arena-mint);
  box-shadow: 0 0 0 3px rgba(21, 128, 61, 0.12);
}

#controlConnectionQuality strong {
  color: #475569;
  font-size: 0.61rem;
}

#personalArena {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--arena-line);
  background: #e8edf3;
  isolation: isolate;
}

#personalArenaCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

#personalArenaHeading {
  position: absolute;
  z-index: 3;
  top: 0.55rem;
  right: max(0.62rem, var(--safe-right));
  left: max(0.62rem, var(--safe-left));
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: none;
}

#personalArenaHeading span,
#personalArenaHeading strong {
  padding: 0.28rem 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.76);
  box-shadow: 0 5px 16px rgba(15, 23, 42, 0.18);
  color: #f8fafc;
  font-size: 0.58rem;
  line-height: 1;
  backdrop-filter: blur(10px);
}

#personalArenaHeading span {
  font-weight: 760;
  letter-spacing: 0.08em;
}

#personalArenaHeading strong {
  max-width: 56%;
  overflow: hidden;
  font-variant-numeric: tabular-nums;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#clientPerformance {
  position: absolute;
  z-index: 4;
  top: 2.55rem;
  right: max(0.62rem, var(--safe-right));
  display: flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.3rem 0.48rem;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 9px;
  background: rgba(15, 23, 42, 0.82);
  color: #f8fafc;
  font-size: 0.52rem;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
}

#clientPerformance strong {
  color: #67e8f9;
  font-size: 0.48rem;
  letter-spacing: 0.08em;
}

#clientPerformance span {
  white-space: nowrap;
}

#clientPerfQuality {
  color: #86efac;
  font-weight: 800;
}

#clientPerformance[data-quality="balanced"] #clientPerfQuality {
  color: #fde68a;
}

#clientPerformance[data-quality="low"] #clientPerfQuality {
  color: #fca5a5;
}

#personalArenaHint {
  position: absolute;
  z-index: 3;
  right: 50%;
  bottom: 0.48rem;
  width: max-content;
  max-width: calc(100% - 8rem);
  margin: 0;
  padding: 0.28rem 0.52rem;
  border-radius: 999px;
  background: rgba(248, 250, 252, 0.86);
  color: #334155;
  font-size: 0.56rem;
  line-height: 1.25;
  text-align: center;
  pointer-events: none;
  transform: translateX(50%);
  backdrop-filter: blur(8px);
}

#personalHud {
  position: absolute;
  z-index: 3;
  top: 2.55rem;
  right: max(0.62rem, var(--safe-right));
  left: max(0.62rem, var(--safe-left));
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
  pointer-events: none;
}

#personalHud div {
  display: grid;
  grid-template-columns: auto auto;
  justify-content: center;
  align-items: baseline;
  column-gap: 0.34rem;
  padding: 0.36rem 0.3rem;
  border: 1px solid rgba(255, 255, 255, 0.64);
  border-radius: 11px;
  background: rgba(248, 250, 252, 0.88);
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.12);
  backdrop-filter: blur(9px);
}

#personalHud span {
  grid-column: 1 / -1;
  color: #526173;
  font-size: 0.52rem;
  text-align: center;
}

#personalHud strong {
  margin-top: 0.08rem;
  font-size: 0.75rem;
}

#personalHud small {
  color: #64748b;
  font-size: 0.52rem;
}

#controlState {
  margin: 0.42rem max(0.65rem, var(--safe-right)) 0;
  margin-left: max(0.65rem, var(--safe-left));
  padding: 0.48rem 0.68rem;
}

#controlStateIcon {
  border-color: var(--arena-cyan);
  background: rgba(37, 99, 235, 0.12);
  box-shadow: none;
}

#controlState.is-locked {
  border-color: rgba(194, 65, 12, 0.4);
  background: rgba(194, 65, 12, 0.06);
}

#controlState.is-locked #controlStateIcon {
  border-color: var(--arena-amber);
  background: transparent;
  box-shadow: none;
}

#controlSurface {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(150px, 0.8fr);
  min-height: 0;
  padding:
    0.25rem
    max(0.7rem, var(--safe-right))
    0.25rem
    max(0.7rem, var(--safe-left));
}

#joystickZone,
#boostZone {
  display: grid;
  place-items: center;
  align-content: center;
  min-width: 0;
}

#joystickZone > p,
#boostZone > p {
  margin: 0.45rem 0 0;
  color: #526173;
  font-size: 0.62rem;
  font-weight: 680;
  letter-spacing: 0.08em;
}

#joystickBase {
  position: relative;
  display: grid;
  place-items: center;
  width: min(46vw, 220px);
  max-height: 100%;
  aspect-ratio: 1;
  border: 2px solid rgba(66, 83, 51, 0.28);
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(101, 121, 84, 0.08) 0 34%, transparent 35%),
    radial-gradient(circle, transparent 0 64%, rgba(66, 83, 51, 0.07) 65%);
  box-shadow: inset 0 0 34px rgba(66, 83, 51, 0.08);
  touch-action: none;
}

#joystickCompass {
  position: absolute;
  inset: 13%;
  border: 1px dashed rgba(148, 178, 211, 0.18);
  border-radius: 50%;
}

#joystickCompass::before,
#joystickCompass::after {
  position: absolute;
  top: 50%;
  left: 50%;
  background: rgba(148, 178, 211, 0.14);
  content: "";
  transform: translate(-50%, -50%);
}

#joystickCompass::before {
  width: 100%;
  height: 1px;
}

#joystickCompass::after {
  width: 1px;
  height: 100%;
}

#joystickKnob {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 42%;
  aspect-ratio: 1;
  border: 2px solid rgba(255, 255, 255, 0.7);
  border-radius: 50%;
  background: linear-gradient(145deg, #748969, #526644);
  box-shadow: 0 12px 26px rgba(51, 65, 40, 0.24), inset 0 1px rgba(255, 255, 255, 0.45);
  pointer-events: none;
  transform: translate3d(0, 0, 0);
  will-change: transform;
}

#joystickKnob span {
  width: 24%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: white;
  box-shadow: 0 0 14px rgba(255, 255, 255, 0.62);
}

#boostButton {
  position: relative;
  display: grid;
  place-items: center;
  align-content: center;
  width: min(34vw, 164px);
  aspect-ratio: 1;
  border: 2px solid rgba(194, 65, 12, 0.48);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(251, 146, 60, 0.16), #fff7ed);
  box-shadow: 0 14px 30px rgba(124, 45, 18, 0.16), inset 0 1px #fff;
  cursor: pointer;
  touch-action: manipulation;
}

#boostButton:disabled {
  filter: saturate(0.5);
  opacity: 0.72;
}

#boostRing {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

#boostRing circle {
  fill: none;
  stroke: rgba(194, 65, 12, 0.14);
  stroke-width: 4;
}

#boostRing #boostProgress {
  stroke: var(--arena-amber);
  stroke-linecap: round;
  stroke-dasharray: 326.73;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 80ms linear;
}

#boostGlyph {
  width: 27px;
  height: 38px;
  margin-bottom: 0.2rem;
  background: var(--arena-amber);
  clip-path: polygon(54% 0, 15% 52%, 47% 52%, 36% 100%, 86% 38%, 55% 38%);
  filter: none;
}

#boostLabel {
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

#boostCooldown {
  margin-top: 0.08rem;
  color: #9a3412;
  font-size: 0.58rem;
  font-weight: 760;
  letter-spacing: 0.08em;
}

#controlFooter {
  display: flex;
  justify-content: space-between;
  padding:
    0.55rem
    calc(0.9rem + var(--safe-right))
    calc(0.55rem + var(--safe-bottom))
    calc(0.9rem + var(--safe-left));
  border-top: 1px solid var(--arena-line);
  background: #fff;
  color: var(--arena-muted);
  font-size: 0.66rem;
}

#matchClock {
  color: #334155;
  font-variant-numeric: tabular-nums;
}

#spectatorScreen {
  text-align: center;
}

#spectatorCore {
  width: 92px;
  margin: 0 auto 1rem;
  opacity: 0.5;
  filter: grayscale(0.2);
}

#spectatorStats {
  grid-template-columns: 1fr 1fr;
}

#controllerCountdown {
  position: fixed;
  z-index: 900;
  inset: 0;
  display: grid;
  place-content: center;
  visibility: hidden;
  background: rgba(248, 250, 252, 0.94);
  opacity: 0;
  text-align: center;
  backdrop-filter: blur(8px);
}

#controllerCountdown.is-visible {
  visibility: visible;
  opacity: 1;
}

#controllerCountdown span {
  color: #334155;
  font-size: 0.82rem;
  font-weight: 760;
  letter-spacing: 0.15em;
}

#controllerCountdown strong {
  color: var(--arena-cyan);
  font-size: clamp(7rem, 40vw, 12rem);
  line-height: 0.9;
  text-shadow: none;
}

@media (max-width: 1080px) {
  #hostLayout {
    grid-template-columns: minmax(0, 1fr) 300px;
  }

  #hostHeader {
    grid-template-columns: 1fr auto;
  }

  #roomSummary {
    justify-self: center;
  }

  #hostMetrics {
    display: none;
  }

  #leaderboard {
    width: 190px;
  }

  #matchHud div {
    min-width: 78px;
  }

  #lobbyOverlay {
    grid-template-columns: minmax(300px, 1fr) 240px;
    gap: 1rem;
    padding: 1.25rem;
  }

  #lobbyQrFrame {
    width: 230px;
  }

  #lobbyHeadline h1 {
    font-size: clamp(2rem, 4vw, 3rem);
  }
}

@media (max-width: 760px) {
  #collisionArenaHost {
    height: auto;
    min-height: 100svh;
    overflow-y: auto;
  }

  #hostHeader {
    grid-template-columns: 1fr;
    gap: 0.65rem;
    height: auto;
    padding: calc(0.8rem + var(--safe-top)) 0.8rem 0.8rem;
  }

  #brandLockup {
    display: none;
  }

  #hostLayout {
    grid-template-columns: 1fr;
    height: auto;
  }

  #arenaStage {
    height: 64svh;
    min-height: 430px;
    border-right: 0;
    border-bottom: 1px solid var(--arena-line);
  }

  #lobbyOverlay {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 1rem;
    padding: 1rem;
    text-align: center;
  }

  #lobbyHeadline {
    max-width: 520px;
  }

  #lobbyStatus {
    margin-right: auto;
    margin-left: auto;
  }

  #lobbyJoinCard {
    grid-template-columns: auto auto;
    column-gap: 0.8rem;
    padding: 0.75rem;
  }

  #lobbyQrFrame {
    grid-row: 1 / span 3;
    width: 150px;
  }

  #lobbyJoinCard > span,
  #lobbyRoomCode,
  #lobbyJoinCard small {
    grid-column: 2;
  }

  #hostPanel {
    min-height: 600px;
  }

  #matchHud {
    top: 0.55rem;
    left: 0.55rem;
  }

  #leaderboard {
    top: 0.55rem;
    right: 0.55rem;
  }
}

@media (max-height: 570px) and (orientation: landscape) {
  .controller-screen {
    padding-top: calc(0.5rem + var(--safe-top));
    padding-bottom: calc(0.5rem + var(--safe-bottom));
  }

  .controller-card {
    width: min(94vw, 760px);
    padding: 1rem 1.25rem;
  }

  #joinScreen .controller-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 1rem;
  }

  #joinScreen .controller-brand,
  #joinScreen .controller-kicker,
  #joinScreen h1,
  #joinScreen .controller-intro {
    grid-column: 1;
  }

  #joinScreen .controller-field,
  #joinScreen .controller-error,
  #joinScreen .controller-primary,
  #joinScreen .controller-footnote {
    grid-column: 2;
  }

  #joinScreen .controller-field:first-of-type {
    grid-row: 1 / span 2;
  }

  #joinScreen .controller-field:last-of-type {
    grid-row: 3 / span 2;
  }

  #joinScreen .controller-error {
    grid-row: 5;
  }

  #joinScreen .controller-primary {
    grid-row: 6;
  }

  #joinScreen .controller-footnote {
    display: none;
  }

  #identityCore {
    width: 62px;
  }

  #playerStats {
    margin: 0.75rem 0;
  }

  #readyStatus {
    margin-bottom: 0.6rem;
  }

  #controlHeader {
    grid-column: 1 / -1;
    padding-top: calc(0.5rem + var(--safe-top));
    padding-bottom: 0.45rem;
  }

  #controlScreen.is-active {
    grid-template-columns: minmax(240px, 1.15fr) minmax(290px, 0.85fr);
    grid-template-rows: auto auto minmax(0, 1fr) auto;
  }

  #personalArena {
    grid-row: 2 / 4;
    grid-column: 1;
    border-right: 1px solid var(--arena-line);
    border-bottom: 0;
  }

  #personalHud {
    top: 2.35rem;
  }

  #controlState {
    grid-row: 2;
    grid-column: 2;
    margin-top: 0.35rem;
    padding: 0.42rem 0.6rem;
  }

  #joystickBase {
    width: min(32vh, 185px);
  }

  #boostButton {
    width: min(30vh, 150px);
  }

  #controlSurface {
    grid-row: 3;
    grid-column: 2;
    grid-template-columns: 1.3fr 0.9fr;
  }

  #controlFooter {
    grid-row: 4;
    grid-column: 1 / -1;
  }
}

@media (max-height: 700px) and (orientation: portrait) {
  #controlScreen.is-active {
    grid-template-rows: auto minmax(150px, 1fr) auto minmax(145px, 0.82fr) auto;
  }

  #controlHeader {
    padding-top: calc(0.52rem + var(--safe-top));
    padding-bottom: 0.5rem;
  }

  #controlConnectionQuality strong {
    display: none;
  }

  #personalArenaHint {
    display: none;
  }

  #controlState small {
    overflow: hidden;
    max-height: 1.4em;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  #joystickZone > p,
  #boostZone > p {
    display: none;
  }

  #joystickBase {
    width: min(43vw, 170px);
  }

  #boostButton {
    width: min(31vw, 138px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  #hostHeader,
  #matchHud,
  #leaderboard,
  #lobbyStatus,
  .controller-card,
  #controlHeader,
  #personalHud div,
  #personalArenaHeading span,
  #personalArenaHeading strong,
  #personalArenaHint {
    background: var(--arena-panel-solid);
    backdrop-filter: none;
  }

  #personalArenaHeading span,
  #personalArenaHeading strong {
    color: var(--arena-text);
  }
}

@media (prefers-contrast: more) {
  :root {
    --arena-line: rgba(30, 41, 59, 0.52);
    --arena-line-strong: rgba(30, 41, 59, 0.82);
    --arena-muted: #334155;
  }
}