:root {
  color-scheme: dark;
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
  --bg-app: radial-gradient(circle at top, #182643 0%, #0a0f1d 52%, #05070f 100%);
  --bg-panel: linear-gradient(180deg, rgba(16, 25, 45, 0.96), rgba(6, 10, 21, 0.98));
  --bg-card: rgba(9, 16, 31, 0.9);
  --bg-card-strong: rgba(13, 20, 39, 0.98);
  --bg-board: #09111f;
  --bg-cell: #0d1728;
  --text-primary: #f8fbff;
  --text-muted: #9eb1d1;
  --text-dim: #7083a5;
  --accent-primary: #7cff6b;
  --accent-secondary: #49d7ff;
  --accent-danger: #ff5d7a;
  --accent-warning: #ffd166;
  --accent-success: #87ffb5;
  --border-subtle: rgba(126, 156, 214, 0.2);
  --border-strong: rgba(124, 255, 107, 0.38);
  --glow-primary: 0 0 0 1px rgba(124, 255, 107, 0.25), 0 0 24px rgba(124, 255, 107, 0.2);
  --glow-secondary: 0 0 0 1px rgba(73, 215, 255, 0.25), 0 0 24px rgba(73, 215, 255, 0.2);
  --glow-danger: 0 0 0 1px rgba(255, 93, 122, 0.28), 0 0 28px rgba(255, 93, 122, 0.22);
  --shadow-panel: 0 28px 80px rgba(0, 0, 0, 0.48);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --app-padding: 14px;
  --panel-padding: 18px;
  --motion-fast: 140ms;
  --motion-base: 220ms;
  --motion-slow: 420ms;
  --ease-arcade: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg-app); color: var(--text-primary); }
button, input { font: inherit; }
button { cursor: pointer; }
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255,255,255,0.03), rgba(255,255,255,0)) 0 0 / 100% 100%,
    repeating-linear-gradient(180deg, rgba(255,255,255,0.025) 0, rgba(255,255,255,0.025) 1px, transparent 1px, transparent 4px);
  opacity: 0.22;
}
.app {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: var(--app-padding);
}
.panel {
  width: min(100%, 960px);
  padding: var(--panel-padding);
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
  position: relative;
  overflow: hidden;
}
.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(124, 255, 107, 0.06), transparent 30%, rgba(73, 215, 255, 0.08) 100%);
  pointer-events: none;
}
.panel.gameplay-active {
  width: min(100%, 1240px);
  min-height: calc(100dvh - (var(--app-padding) * 2));
  display: grid;
  align-content: start;
}
.panel-top, .room-header, .lobby-meta-row, .player-meta, .player-card-head, .topbar-actions {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
}
.topbar-actions { align-items: center; flex-wrap: wrap; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 8px; font-size: clamp(2rem, 4vw, 3rem); }
.kicker, .eyebrow {
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.75rem;
}
.subtitle, .message, .controls-hint, .info-copy, .game-meta-stack, .player-meta span, .player-state {
  color: var(--text-muted);
}
.status, .error, .badge {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid transparent;
}
.status {
  background: rgba(73, 215, 255, 0.12);
  border-color: rgba(73, 215, 255, 0.24);
}
.error {
  background: rgba(255, 93, 122, 0.14);
  border-color: rgba(255, 93, 122, 0.28);
}
.hidden { display: none !important; }
.screen { margin-top: 18px; position: relative; z-index: 1; }
.hero-card, .info-card, .player, .score-card, .post-game-banner {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.22);
}
.hero-card {
  display: grid;
  gap: 18px;
  padding: 22px;
  background:
    radial-gradient(circle at top right, rgba(73, 215, 255, 0.16), transparent 26%),
    radial-gradient(circle at bottom left, rgba(124, 255, 107, 0.14), transparent 30%),
    var(--bg-card-strong);
}
.hero-copy h2 { font-size: clamp(1.4rem, 3vw, 2.4rem); margin-bottom: 12px; }
.actions, .lobby, .game, .game-side, .game-center, .info-card, .game-meta-stack, .compact-score-card, .players {
  display: grid;
  gap: 12px;
}
.arcade-actions { gap: 14px; }
.join-row { display: flex; gap: 10px; }
input, button {
  border-radius: 14px;
  border: 1px solid rgba(126, 156, 214, 0.28);
  padding: 12px 14px;
  transition: transform var(--motion-fast) var(--ease-arcade), box-shadow var(--motion-fast) var(--ease-arcade), border-color var(--motion-fast) var(--ease-arcade), background var(--motion-fast) var(--ease-arcade), color var(--motion-fast) var(--ease-arcade), opacity var(--motion-fast) var(--ease-arcade);
}
input {
  flex: 1;
  background: rgba(5, 10, 20, 0.92);
  color: var(--text-primary);
  text-transform: uppercase;
  box-shadow: inset 0 0 0 1px rgba(73, 215, 255, 0.06);
}
input:focus-visible, button:focus-visible {
  outline: none;
  border-color: rgba(73, 215, 255, 0.72);
  box-shadow: var(--glow-secondary);
}
button:hover:not(:disabled) { transform: translateY(-1px); }
button:active:not(:disabled) { transform: translateY(0); }
button:disabled { cursor: not-allowed; opacity: 0.58; }
.primary-button {
  background: linear-gradient(135deg, var(--accent-primary), #27d38a);
  color: #04140a;
  font-weight: 800;
  box-shadow: 0 12px 24px rgba(39, 211, 138, 0.18);
}
.secondary-button, .sound-toggle {
  background: rgba(7, 14, 28, 0.92);
  color: var(--text-primary);
}
.primary-button.is-waiting, .post-game-button.waiting, .post-game-button.accepted, .sound-toggle.is-muted {
  background: rgba(7, 14, 28, 0.92);
  color: var(--text-primary);
}
.room-code-hero {
  padding: 18px;
  border: 1px solid rgba(124, 255, 107, 0.22);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(124, 255, 107, 0.1), rgba(73, 215, 255, 0.08));
  box-shadow: var(--glow-primary);
}
.room-code, .game-room-code {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 900;
  letter-spacing: 0.18em;
}
.game-room-code { font-size: clamp(1.5rem, 3vw, 2.2rem); }
.badge, .player-chip {
  width: fit-content;
  text-transform: capitalize;
  background: rgba(73, 215, 255, 0.12);
  border: 1px solid rgba(73, 215, 255, 0.22);
}
.player {
  padding: 16px;
  background: rgba(10, 18, 34, 0.9);
}
.player.you { border-color: rgba(124, 255, 107, 0.44); box-shadow: var(--glow-primary); }
.player.ready { border-color: rgba(124, 255, 107, 0.32); }
.player.waiting { opacity: 0.72; }
.player-state { margin-top: 8px; }
.ready-button { min-height: 54px; }
.game { margin-top: 0; align-content: start; }
.game-shell {
  display: grid;
  grid-template-columns: minmax(200px, 244px) minmax(0, 1fr) minmax(200px, 244px);
  grid-template-areas: "left center right";
  align-items: start;
  gap: 18px;
}
.game-side-left { grid-area: left; }
.game-center { grid-area: center; }
.game-side-right { grid-area: right; }
.game-center {
  position: relative;
  justify-items: center;
  align-content: start;
}
.info-card { padding: 14px; background: rgba(7, 13, 24, 0.92); }
.gameplay-summary-card { min-height: 128px; }
.game-phase { font-size: clamp(1.5rem, 2vw, 2rem); font-weight: 800; }
.player-card { position: relative; overflow: hidden; }
.player-card[data-player="0"] { border-color: rgba(124, 255, 107, 0.32); }
.player-card[data-player="1"] { border-color: rgba(73, 215, 255, 0.32); }
.player-card.is-you::after {
  content: "YOU";
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}
.player-card.is-leading { box-shadow: var(--glow-primary); }
.player-card.is-eliminated { opacity: 0.72; }
.player-chip { padding: 6px 10px; border-radius: 999px; font-size: 0.75rem; }
.score-card {
  min-width: 96px;
  padding: 12px 14px;
  background: rgba(9, 17, 31, 0.95);
  display: grid;
  gap: 4px;
  min-height: 104px;
  align-content: center;
}
.score-card strong { font-size: clamp(2rem, 3vw, 2.6rem); line-height: 1; }
.player-one { border-color: rgba(124, 255, 107, 0.4); }
.player-two { border-color: rgba(73, 215, 255, 0.4); }
.score-card.score-pop { animation: scorePop 420ms var(--ease-arcade); }
.game-stage {
  width: min(100%, 760px);
  aspect-ratio: 1;
  position: relative;
  border-radius: 24px;
  padding: 12px;
  background: linear-gradient(180deg, rgba(12, 21, 39, 0.98), rgba(5, 10, 20, 0.98));
  border: 1px solid rgba(126, 156, 214, 0.28);
  box-shadow: 0 22px 42px rgba(0, 0, 0, 0.28), inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  overflow: hidden;
}
.game-stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 45%, rgba(73, 215, 255, 0.06) 100%);
  pointer-events: none;
}
.board-fx-layer, .countdown-overlay {
  position: absolute;
  inset: 12px;
  border-radius: 18px;
  pointer-events: none;
}
.board-fx-layer { opacity: 0; }
.board-fx-layer.flash-collision { animation: boardFlashDanger 240ms ease-out; }
.board-fx-layer.flash-win { animation: boardFlashWin 560ms ease-out; }
.board-fx-layer.flash-draw { animation: boardFlashDraw 420ms ease-out; }
.board {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(30, minmax(0, 1fr));
  gap: 1px;
  background: rgba(70, 90, 120, 0.42);
  border: 1px solid rgba(108, 133, 175, 0.32);
  border-radius: 18px;
  padding: 1px;
  width: 100%;
  height: 100%;
}
.cell {
  background: linear-gradient(180deg, #111d31, #0b1524);
  aspect-ratio: 1;
}
.cell.food {
  background: radial-gradient(circle, #fff2b3 0%, var(--accent-warning) 42%, #ff7b54 100%);
  box-shadow: 0 0 10px rgba(255, 209, 102, 0.42);
}
.cell.food:not(.reduce-motion) { animation: foodPulse 1000ms ease-in-out infinite; }
.cell.snake-0 {
  background: linear-gradient(180deg, #8dff72, #34d87f);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
}
.cell.snake-1 {
  background: linear-gradient(180deg, #89ebff, #3fb8ff);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
}
.cell.head { box-shadow: inset 0 0 0 2px rgba(255,255,255,.38), 0 0 12px rgba(255,255,255,0.14); }
.countdown-overlay {
  z-index: 2;
  display: grid;
  place-items: center;
  font-size: clamp(4rem, 12vw, 7.5rem);
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
  background: radial-gradient(circle at center, rgba(124, 255, 107, 0.12), rgba(73, 215, 255, 0.04) 45%, transparent 72%);
  text-shadow: 0 0 18px rgba(124, 255, 107, 0.38), 0 0 48px rgba(73, 215, 255, 0.28);
}
.countdown-overlay[data-countdown-value='GO'] {
  color: #fff2b3;
  text-shadow: 0 0 20px rgba(255, 210, 103, 0.48), 0 0 54px rgba(255, 123, 84, 0.26);
}
.countdown-overlay.is-active { animation: countdownPulse 620ms var(--ease-arcade); }
.game-message {
  margin: 0;
  text-align: center;
  max-width: min(100%, 760px);
  min-height: 24px;
}
.touch-controls {
  width: min(100%, 420px);
  display: grid;
  gap: 10px;
  justify-items: center;
}
.touch-controls-row {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.touch-control {
  width: 100%;
  min-height: 56px;
  font-size: 1.4rem;
  font-weight: 800;
  touch-action: manipulation;
}
.touch-control-up {
  width: min(44%, 140px);
}
.game-stage.is-touch-active {
  touch-action: none;
}
.panel[data-layout-mode^="mobile"] .controls-hint,
.panel[data-touch="true"] .controls-hint {
  font-size: 0.95rem;
}
.panel[data-layout-mode^="mobile"] .controls-hint {
  margin-top: 10px;
}
.build-marker, .inline-build-marker {
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(126, 156, 214, 0.2);
  background: rgba(5, 10, 20, 0.88);
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.2;
  letter-spacing: 0.02em;
}
.rematch-card.highlighted { box-shadow: var(--glow-primary); }
.post-game-banner {
  position: absolute;
  top: 18px;
  left: 50%;
  z-index: 3;
  width: min(calc(100% - 24px), 680px);
  padding: 20px;
  display: grid;
  gap: 12px;
  transform: translateX(-50%);
  background: linear-gradient(135deg, rgba(124, 255, 107, 0.16), rgba(10, 18, 34, 0.96) 40%, rgba(73, 215, 255, 0.14));
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.34);
}
.panel[data-outcome="lose"] .post-game-banner { background: linear-gradient(135deg, rgba(255, 93, 122, 0.18), rgba(10, 18, 34, 0.96)); }
.panel[data-outcome="draw"] .post-game-banner { background: linear-gradient(135deg, rgba(73, 215, 255, 0.18), rgba(10, 18, 34, 0.96)); }
.post-game-title { font-size: clamp(1.9rem, 4vw, 3rem); margin-bottom: 0; }
.post-game-copy { margin-bottom: 0; }
.post-game-button { width: 100%; min-height: 56px; font-size: 1rem; }
.controls-hint { margin: 6px 0 0; text-align: center; }

.panel[data-layout-mode^="mobile"] .status,
.panel[data-layout-mode^="mobile"] .error,
.panel[data-layout-mode^="mobile"] .badge { margin-top: 10px; }
.panel[data-layout-mode="mobile-portrait"] { --panel-padding: 14px; }
.panel[data-layout-mode="mobile-landscape"] { --panel-padding: 12px; }
.panel[data-layout-mode="mobile-portrait"] .game-shell,
.panel[data-layout-mode="mobile-landscape"] .game-shell {
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "center"
    "right"
    "left";
}
.panel[data-layout-mode="mobile-portrait"] .game-shell { gap: 14px; }
.panel[data-layout-mode="mobile-landscape"] .game-shell { gap: 12px; }
.panel[data-layout-mode="mobile-portrait"] .game-side-left,
.panel[data-layout-mode="mobile-portrait"] .game-side-right {
  grid-template-columns: 1fr;
  gap: 10px;
}
.panel[data-layout-mode="mobile-landscape"] .game-side-left,
.panel[data-layout-mode="mobile-landscape"] .game-side-right {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.panel[data-layout-mode="mobile-portrait"] .room-info-card { order: -2; }
.panel[data-layout-mode="mobile-portrait"] .game-meta-stack { order: -1; }
.panel[data-layout-mode="mobile-portrait"] .gameplay-summary-card { min-height: unset; }
.panel[data-layout-mode="mobile-portrait"] .game-stage { width: min(100%, 520px); }
.panel[data-layout-mode="mobile-landscape"] .game-stage {
  width: min(100%, calc(100dvh - 120px), 420px);
  max-height: calc(100dvh - 120px);
  margin-inline: auto;
}
.panel[data-layout-mode="mobile-landscape"] .touch-controls { width: min(100%, 320px); gap: 6px; }
.panel[data-layout-mode="mobile-landscape"] .touch-controls-row { gap: 6px; }
.panel[data-layout-mode="mobile-landscape"] .touch-control { min-height: 44px; padding: 10px 12px; }
.panel[data-layout-mode="mobile-landscape"] .touch-control-up { width: min(42%, 124px); }
.panel[data-layout-mode="mobile-landscape"] .game-center { gap: 6px; }
.panel[data-layout-mode="mobile-landscape"] .post-game-banner {
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  width: min(calc(100% - 16px), 420px);
  padding: 12px;
  gap: 8px;
  margin-bottom: 0;
}
.panel[data-layout-mode="mobile-landscape"] .post-game-title { font-size: clamp(1.15rem, 3.8vw, 1.55rem); }
.panel[data-layout-mode="mobile-landscape"] .post-game-copy { font-size: 0.82rem; }
.panel[data-layout-mode="mobile-landscape"] .post-game-button { min-height: 44px; }
.panel[data-layout-mode^="mobile"]:not([data-layout-mode="mobile-landscape"]) .post-game-banner {
  position: relative;
  top: auto;
  left: auto;
  transform: none;
  width: 100%;
  margin-bottom: 4px;
}
.panel[data-layout-mode^="mobile"] .room-code,
.panel[data-layout-mode^="mobile"] .game-room-code { font-size: clamp(1.35rem, 7vw, 2.1rem); }
.panel[data-layout-mode^="mobile"] .player-card-head,
.panel[data-layout-mode^="mobile"] .room-header { align-items: center; }
.panel[data-layout-mode^="mobile"] .score-card { min-height: auto; }
.panel[data-layout-mode^="mobile"] .game-message { max-width: 100%; font-size: 0.95rem; }
.panel[data-layout-mode^="mobile"] .touch-controls { width: min(100%, 360px); }
.panel.phase-countdown .game-stage { box-shadow: 0 0 0 1px rgba(124, 255, 107, 0.22), 0 22px 42px rgba(0,0,0,0.28), 0 0 52px rgba(124,255,107,0.12); }
.panel.phase-result[data-outcome="win"] .game-stage { box-shadow: 0 0 0 1px rgba(124,255,107,0.24), 0 22px 42px rgba(0,0,0,0.28), 0 0 46px rgba(124,255,107,0.12); }
.panel.phase-result[data-outcome="lose"] .game-stage { box-shadow: 0 0 0 1px rgba(255,93,122,0.24), 0 22px 42px rgba(0,0,0,0.28), 0 0 42px rgba(255,93,122,0.10); }
.panel.phase-result[data-outcome="draw"] .game-stage { box-shadow: 0 0 0 1px rgba(73,215,255,0.24), 0 22px 42px rgba(0,0,0,0.28), 0 0 42px rgba(73,215,255,0.10); }
.sound-toggle.is-confirmed, .secondary-button.is-confirmed { box-shadow: var(--glow-secondary); }

@keyframes countdownPulse {
  0% { opacity: 0; transform: scale(0.68); filter: saturate(0.8); }
  18% { opacity: 1; }
  52% { opacity: 1; transform: scale(1.02); filter: saturate(1.18); }
  100% { opacity: 0.12; transform: scale(1.14); filter: saturate(1); }
}
@keyframes scorePop {
  0% { transform: translateY(0); box-shadow: none; }
  30% { transform: translateY(-6px); box-shadow: var(--glow-primary); }
  100% { transform: translateY(0); box-shadow: none; }
}
@keyframes boardFlashDanger {
  0% { opacity: 0; background: transparent; }
  20% { opacity: 1; background: rgba(255, 93, 122, 0.38); }
  100% { opacity: 0; background: rgba(255, 93, 122, 0); }
}
@keyframes boardFlashWin {
  0% { opacity: 0; background: transparent; }
  25% { opacity: 1; background: radial-gradient(circle at center, rgba(124,255,107,0.3), rgba(73,215,255,0.2)); }
  100% { opacity: 0; background: transparent; }
}
@keyframes boardFlashDraw {
  0% { opacity: 0; background: transparent; }
  25% { opacity: 1; background: rgba(73, 215, 255, 0.28); }
  100% { opacity: 0; background: transparent; }
}
@keyframes foodPulse {
  0%, 100% { transform: scale(1); filter: brightness(1); }
  50% { transform: scale(0.94); filter: brightness(1.12); }
}

@media (max-width: 1100px) {
  .game-shell { grid-template-columns: minmax(170px, 210px) minmax(0, 1fr) minmax(170px, 210px); gap: 14px; }
  .panel[data-layout-mode="tablet"] .game-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "center"
      "left"
      "right";
  }
  .panel[data-layout-mode="tablet"] .game-side-left,
  .panel[data-layout-mode="tablet"] .game-side-right {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 860px) {
  .game-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "center"
      "left"
      "right";
  }
  .game-side-left, .game-side-right { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .post-game-banner {
    top: 12px;
    width: min(calc(100% - 16px), 680px);
  }
}
@media (max-width: 720px) {
  .panel-top, .room-header, .lobby-meta-row, .topbar-actions { flex-direction: column; align-items: flex-start; }
  .join-row { flex-direction: column; }
  .hero-card, .player, .info-card, .post-game-banner { padding: 16px; }
  .game-side-left, .game-side-right { grid-template-columns: 1fr; }
  .panel { padding: 16px; }
  .room-code-hero, .room-info-card { width: 100%; }
  .primary-button, .secondary-button, input { min-height: 48px; }
  .game-stage { padding: 10px; width: min(100%, 100vw - 32px); }
  .board-fx-layer, .countdown-overlay { inset: 10px; }
}
@media (max-width: 768px) {
  .app { padding: 10px; place-items: start center; }
  .panel, .panel.gameplay-active { width: 100%; min-height: calc(100dvh - 20px); }
  .panel[data-layout-mode="mobile-portrait"] { --panel-padding: 14px; }
  .panel[data-layout-mode="mobile-landscape"] { --panel-padding: 12px; }
  .panel[data-layout-mode^="mobile"] .status,
  .panel[data-layout-mode^="mobile"] .error,
  .panel[data-layout-mode^="mobile"] .badge { margin-top: 10px; }
  .panel[data-layout-mode="mobile-portrait"] .game-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "center"
      "right"
      "left";
    gap: 14px;
  }
  .panel[data-layout-mode="mobile-portrait"] .game-side-left,
  .panel[data-layout-mode="mobile-portrait"] .game-side-right {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .panel[data-layout-mode="mobile-portrait"] .room-info-card { order: -2; }
  .panel[data-layout-mode="mobile-portrait"] .game-meta-stack { order: -1; }
  .panel[data-layout-mode="mobile-portrait"] .gameplay-summary-card { min-height: unset; }
  .panel[data-layout-mode="mobile-portrait"] .game-stage { width: min(100%, 520px); }
  .panel[data-layout-mode="mobile-landscape"] .game-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "center"
      "right"
      "left";
    gap: 12px;
  }
  .panel[data-layout-mode="mobile-landscape"] .game-side-left,
  .panel[data-layout-mode="mobile-landscape"] .game-side-right {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
  .panel[data-layout-mode="mobile-landscape"] .game-stage {
    width: min(100%, calc(100dvh - 120px), 420px);
    max-height: calc(100dvh - 120px);
    margin-inline: auto;
  }
  .panel[data-layout-mode="mobile-landscape"] .touch-controls { width: min(100%, 320px); gap: 6px; }
  .panel[data-layout-mode="mobile-landscape"] .touch-controls-row { gap: 6px; }
  .panel[data-layout-mode="mobile-landscape"] .touch-control { min-height: 44px; padding: 10px 12px; }
  .panel[data-layout-mode="mobile-landscape"] .touch-control-up { width: min(42%, 124px); }
  .panel[data-layout-mode="mobile-landscape"] .game-center { gap: 6px; }
  .panel[data-layout-mode="mobile-landscape"] .post-game-banner {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    width: min(calc(100% - 16px), 420px);
    padding: 12px;
    gap: 8px;
    margin-bottom: 0;
  }
  .panel[data-layout-mode="mobile-landscape"] .post-game-title { font-size: clamp(1.15rem, 3.8vw, 1.55rem); }
  .panel[data-layout-mode="mobile-landscape"] .post-game-copy { font-size: 0.82rem; }
  .panel[data-layout-mode="mobile-landscape"] .post-game-button { min-height: 44px; }
  .panel[data-layout-mode^="mobile"]:not([data-layout-mode="mobile-landscape"]) .post-game-banner {
    position: relative;
    top: auto;
    left: auto;
    transform: none;
    width: 100%;
    margin-bottom: 4px;
  }
  .panel[data-layout-mode^="mobile"] .room-code,
  .panel[data-layout-mode^="mobile"] .game-room-code { font-size: clamp(1.35rem, 7vw, 2.1rem); }
  .panel[data-layout-mode^="mobile"] .player-card-head,
  .panel[data-layout-mode^="mobile"] .room-header { align-items: center; }
  .panel[data-layout-mode^="mobile"] .score-card { min-height: auto; }
  .panel[data-layout-mode^="mobile"] .game-message { max-width: 100%; font-size: 0.95rem; }
  .panel[data-layout-mode^="mobile"] .touch-controls { width: min(100%, 360px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  button:hover:not(:disabled) { transform: none; }
}