.open-arena-body {
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
}

.open-arena-main {
  width: min(var(--page-max-width), calc(100% - 24px));
  margin-right: auto;
  margin-left: auto;
}

.arena-direct-main {
  padding: 6px 0 30px;
}

.arena-direct-comparison {
  border: 0;
}

.challenge-shell {
  padding: 0;
  border: 0;
  background: transparent;
}

.prompt-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(190px, 1fr) auto minmax(190px, 1fr);
  gap: 5px;
  align-items: center;
  margin-bottom: 14px;
  padding: 6px 16px;
  border: 0;
  background: transparent;
  text-align: center;
}

.prompt-card-copy {
  grid-column: 2;
  display: grid;
  gap: 3px;
}

.arena-playground-link {
  grid-column: 3;
  justify-self: end;
  border-color: var(--border-strong);
  color: var(--text-primary);
  background: var(--bg-elevated);
  white-space: nowrap;
}

.arena-playground-link:hover,
.arena-playground-link:focus-visible {
  border-color: var(--gold);
  color: var(--bg-page);
  background: var(--brand-hover);
  outline: none;
}

.arena-playground-link:active {
  background: var(--brand-pressed);
}

.prompt-card h1 {
  margin: 0;
  font: 900 clamp(22px, 2.3vw, 30px) / 1.02 var(--sans);
  letter-spacing: -0.03em;
}

.prompt-card p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(14px, 0.8vw, 16px);
  font-weight: 650;
  line-height: 1.15;
}

/* Reserve the final Arena geometry before the module mounts the live cards. */
.open-arena-body.is-arena-booting .prompt-card-copy,
.open-arena-body.is-arena-booting .arena-playground-link {
  visibility: hidden;
}

.open-arena-body.is-arena-booting .arena-comparison .replay-card-mount {
  position: relative;
  min-height: 360px;
  overflow: hidden;
  border: 2px solid var(--border-strong);
  aspect-ratio: 1.18;
  background:
    linear-gradient(
      to bottom,
      #a8d9ea 0,
      #a8d9ea calc(100% - 104px),
      var(--panel) calc(100% - 104px),
      var(--panel) 100%
    );
  box-shadow: var(--shadow-soft);
}

.arena-comparison {
  --arena-stage-height: clamp(360px, calc(100vh - 340px), 960px);
  --arena-stage-height: clamp(360px, calc(100dvh - 340px), 960px);
  gap: var(--control-cluster-gap);
}

.arena-comparison .replay-card-mount:empty,
.open-arena-body.is-arena-booting .arena-comparison .replay-card-mount {
  min-height: var(--arena-stage-height);
  aspect-ratio: auto;
}

.arena-comparison .versus {
  z-index: 8;
  top: var(--arena-versus-top, 47%);
  width: 44px;
  height: 30px;
  border: 1px solid var(--brand-yellow);
  border-radius: var(--radius-surface);
  color: var(--brand-yellow);
  background: var(--bg-elevated);
  box-shadow: none;
  font-size: 14px;
  pointer-events: none;
  visibility: hidden;
}

.arena-comparison .run-letter {
  width: 32px;
  height: 32px;
  box-shadow: none;
  font-size: 17px;
}

.arena-comparison .versus.is-positioned {
  visibility: visible;
}

.open-arena-body.is-arena-booting .arena-comparison .versus {
  visibility: hidden;
}

.arena-comparison .replay-card-mount > .run-card {
  height: 100%;
}

.arena-comparison .run-card {
  border: 1px solid var(--border-strong);
  transition: opacity 120ms ease;
}

.arena-comparison.is-loading-pair .run-card {
  pointer-events: none;
}

.arena-replay-loading {
  top: 14px;
}

.arena-boot-loading {
  top: calc((100% - 104px) / 2);
}

.arena-comparison .diorama-frame {
  position: relative;
  height: var(--arena-stage-height);
  aspect-ratio: auto;
  margin: 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
}

.arena-comparison .scene-viewport canvas {
  border-radius: 0;
}

.arena-comparison .card-vote-row {
  margin: 0;
}

.arena-comparison .card-vote {
  border-radius: var(--radius-control);
}

.arena-comparison .scene-transport {
  grid-template-columns: 28px minmax(0, 1fr) max-content 28px;
  gap: var(--control-cluster-gap);
  padding: 18px 7px 7px;
  background: linear-gradient(transparent, rgba(8, 9, 6, 0.82));
}

.arena-comparison .scene-transport-restart {
  font-size: 13px;
}

.replay-stage,
.replay-stage canvas {
  width: 100%;
  height: 100%;
}

.arena-replay-card .replay-stage {
  cursor: grab;
  touch-action: pan-y;
  user-select: none;
}

.arena-replay-card .replay-stage.is-orbiting {
  cursor: grabbing;
}

.arena-replay-card .replay-card-solution summary strong {
  color: var(--text-secondary);
}

.open-arena-body .card-vote {
  min-height: var(--replay-action-height);
}

.open-arena-body .card-vote:not(.is-vote-result):not(.is-vote-locked) {
  border-color: var(--border-strong);
  color: var(--brand-yellow);
  background: var(--bg-elevated);
}

.open-arena-body .card-vote:not(.is-vote-result):not(.is-vote-locked):hover,
.open-arena-body .card-vote:not(.is-vote-result):not(.is-vote-locked):focus-visible {
  border-color: var(--brand-yellow);
  color: var(--bg-page);
  background: var(--brand-yellow);
  outline: none;
}

.open-arena-body .card-vote:not(.is-vote-result):not(.is-vote-locked):active {
  border-color: var(--brand-pressed);
  color: var(--bg-page);
  background: var(--brand-pressed);
}

.open-arena-body .card-vote.is-vote-result {
  flex-direction: row;
  gap: 10px;
  padding-right: 10px;
  padding-left: 10px;
  border-color: var(--border-strong);
  color: var(--cream);
  background: var(--panel-light);
  cursor: default;
}

.open-arena-body .card-vote.is-vote-result .vote-arrow:empty {
  display: none;
}

.open-arena-body .card-vote.is-vote-locked,
.open-arena-body .card-vote.is-vote-locked:hover {
  border-color: var(--border-subtle);
  color: var(--text-muted);
  background: var(--bg-elevated);
  cursor: not-allowed;
  opacity: 0.72;
}

.arena-vote-panel {
  position: relative;
  z-index: 7;
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.82fr) minmax(0, 1fr);
  gap: var(--control-cluster-gap);
  align-items: stretch;
  margin: 0;
  padding: 0;
}

.arena-vote-panel .vote-actions {
  display: grid;
  grid-column: 2;
  grid-row: 1;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--control-cluster-gap);
}

#arena-vote-a {
  grid-column: 1;
  grid-row: 1;
}

#arena-vote-b {
  grid-column: 3;
  grid-row: 1;
}

.arena-vote-panel .vote-actions[hidden] {
  display: none;
}

.arena-next-comparison {
  grid-column: 2;
  grid-row: 1;
  min-height: var(--replay-action-height);
  padding: 0 16px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-control);
  color: var(--cream);
  background: var(--bg-elevated);
  font-weight: 900;
  cursor: pointer;
}

.arena-next-comparison:hover,
.arena-next-comparison:focus-visible {
  border-color: var(--brand-hover);
  color: var(--bg-page);
  background: var(--brand-hover);
  outline: none;
}

.arena-next-comparison:active {
  border-color: var(--brand-pressed);
  color: var(--bg-page);
  background: var(--brand-pressed);
}

.arena-next-comparison[hidden],
.arena-vote-panel .vote-actions[hidden] {
  display: none;
}

.arena-decision-panel {
  display: grid;
}

.arena-decision-panel .vote-actions button,
.arena-decision-panel .vote-actions button[data-vote="tie"],
.arena-decision-panel .vote-actions .fail-vote {
  display: grid;
  grid-template-columns: 22px auto;
  gap: 10px;
  align-items: center;
  justify-content: center;
  width: auto;
  min-height: var(--replay-action-height);
  padding: 6px 12px;
  border-color: var(--border-strong);
  border-radius: var(--radius-control);
  color: var(--text-primary);
  background: var(--bg-elevated);
  text-align: left;
}

.arena-decision-panel .vote-actions button[data-vote="tie"] {
  grid-column: 1;
  grid-row: 1;
}

.arena-decision-panel .vote-actions .fail-vote {
  grid-column: 2;
  grid-row: 1;
}

.arena-decision-panel .vote-actions button:not(:disabled):hover,
.arena-decision-panel .vote-actions button:not(:disabled):focus-visible {
  border-color: var(--brand-hover);
  color: var(--bg-page);
  background: var(--brand-hover);
  outline: none;
}

.arena-decision-panel .vote-actions button:not(:disabled):active {
  border-color: var(--brand-pressed);
  color: var(--bg-page);
  background: var(--brand-pressed);
}

.arena-decision-panel .vote-actions button:disabled {
  border-color: var(--border-subtle);
  color: var(--text-muted);
  background: var(--bg-elevated);
  cursor: not-allowed;
  opacity: 0.7;
}

.arena-decision-panel .vote-actions kbd {
  margin: 0;
  padding: 0;
  border: 0;
  color: var(--text-secondary);
  background: transparent;
  font: 800 20px/1 var(--mono);
}

.arena-decision-panel .vote-actions span {
  display: grid;
  gap: 3px;
}

.arena-decision-panel .vote-actions strong {
  color: inherit;
  font-size: 10px;
  letter-spacing: 0.08em;
}

.arena-solution-grid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--control-cluster-gap);
}

.arena-solution-slot {
  min-width: 0;
}

.arena-card-vote-slot {
  min-width: 0;
}

.arena-solution-slot .replay-card-solution {
  margin: 0;
}

@media (max-width: 820px) {
  .arena-comparison {
    grid-template-columns: 1fr;
  }

  .arena-comparison .diorama-frame {
    height: auto;
    aspect-ratio: 16 / 10;
  }

  .arena-comparison .replay-card-mount:empty,
  .open-arena-body.is-arena-booting .arena-comparison .replay-card-mount {
    min-height: 0;
    aspect-ratio: 16 / 10;
  }

  .arena-vote-panel {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 0.82fr) minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .open-arena-main {
    width: min(100% - 16px, 1760px);
  }

  .challenge-shell {
    padding: 8px;
  }

  .prompt-card {
    height: auto;
    min-height: var(--page-context-bar-height);
    grid-template-columns: 1fr;
    gap: 8px;
    padding-block: 8px;
  }

  .prompt-card-copy,
  .arena-playground-link {
    grid-column: 1;
    justify-self: center;
  }

  .arena-vote-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--control-cluster-gap);
  }

  #arena-vote-a {
    grid-column: 1;
    grid-row: 1;
  }

  #arena-vote-b {
    grid-column: 2;
    grid-row: 1;
  }

  .arena-vote-panel .vote-actions {
    grid-column: 1 / -1;
    grid-row: 2;
    gap: var(--control-cluster-gap);
  }

  .arena-solution-grid {
    grid-template-columns: 1fr;
    gap: var(--control-cluster-gap);
  }

  .arena-next-comparison {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
  }

  .arena-comparison .scene-transport {
    grid-template-columns: 28px minmax(0, 1fr) max-content 28px;
  }
}

@media (max-height: 600px) and (min-width: 821px) {
  .arena-comparison {
    --arena-stage-height: clamp(280px, calc(100vh - 340px), 420px);
    --arena-stage-height: clamp(280px, calc(100dvh - 340px), 420px);
  }
}

@media (max-width: 380px) {
  .open-arena-main {
    width: calc(100% - 8px);
  }

  .challenge-shell {
    padding: 4px;
  }

  .prompt-card h1 {
    font-size: 20px;
  }

  .prompt-card p {
    font-size: 11px;
  }

  .arena-decision-panel .vote-actions button,
  .arena-decision-panel .vote-actions button[data-vote="tie"],
  .arena-decision-panel .vote-actions .fail-vote {
    grid-template-columns: 18px auto;
    gap: 6px;
    padding-inline: 6px;
  }

  .arena-decision-panel .vote-actions strong {
    font-size: 9px;
  }

  .arena-solution-grid .solution-drawer summary {
    grid-template-columns: auto minmax(0, 1fr) 16px;
    gap: 8px;
    padding-inline: 10px;
  }
}

/* Arena-specific shells use the shared corner hierarchy from styles.css. */
.open-arena-body.is-arena-booting .arena-comparison .replay-card-mount {
  border-radius: var(--radius-surface);
  overflow: hidden;
}

/* Match the shared large-desktop reading scale used across the rest of the
   site without changing the compact layout on laptops and mobile devices. */
@media (min-width: 1600px) {
  .arena-replay-loading,
  .arena-decision-panel .vote-actions strong {
    font-size: 12px;
  }

  .prompt-card p {
    font-size: 14px;
  }
}