/* Reserve the same board and header tracks for every display preference.
   Cell sizing policy lives in src/ui/arena-geometry.js. */
:root[data-runtime="desktop"].game-viewport { overflow: auto; scrollbar-gutter: stable; }
:root[data-runtime="desktop"] body.game-active { height: auto; min-height: 0; overflow: visible; }
.game-loading-status { display: none; }
:root:has(.arena3.game-loading) { background: #113f2f; }
.arena3.game-loading { overflow: clip; }
.arena3.game-loading .game-loading-status {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100dvh;
  z-index: 50;
  box-sizing: border-box;
  padding: 24px 16px;
  margin: 0;
  background: #113f2f;
  text-align: center;
  color: #f0fff6;
  pointer-events: none;
}
.game-loading-status p { margin: 0; font-size: clamp(18px, 3.5vw, 24px); font-weight: 700; line-height: 1.3; }
/* Reserve board geometry without painting grids, controls or decorations. */
.arena3.game-loading > :not(.game-loading-status),
.arena3.game-loading > :not(.game-loading-status) * { visibility: hidden; }
body:has(.arena3.game-loading) #gameReady,
body:has(.arena3.game-loading) #gameReady::backdrop { visibility: hidden; }
.arena3.grid-first-layout {
  display: grid !important;
  grid-template-columns: repeat(2, var(--player-width));
  grid-template-rows: max-content;
  justify-content: center;
  align-content: start;
  align-items: start;
  gap: 0;
  width: var(--layout-width, 100%);
  height: var(--layout-height, 100dvh);
  padding: var(--arena-header-height, 56px) 8px 8px;
}
:root[data-runtime="desktop"] .arena3.grid-first-layout {
  min-height: var(--layout-height, 100dvh);
  height: auto;
  /* Particle flight must not enlarge the document on each animation frame.
     Real second-row panels still grow this box and remain page-scrollable. */
  overflow: clip;
}
body .arena3.grid-first-layout .arena-boards > .player-wrap,
body.net-mode .arena3.grid-first-layout .arena-boards > .player-wrap {
  width: calc((var(--cols) + 1) * var(--cell) + (var(--cols) - 1) * var(--gap) + 16px);
  min-width: 0;
  padding: 0;
  grid-row: 1;
}
.arena3.grid-first-layout #p1 { grid-column: 1; }
.arena3.grid-first-layout #p2 { grid-column: 2; }
.arena3.grid-first-layout .arena-boards {
  grid-column: 1 / -1;
  grid-row: 1;
  display: grid;
  grid-template-columns: repeat(2, var(--player-width));
  align-items: start;
  min-width: 0;
}
body .arena3.grid-first-layout .username,
body.net-mode .arena3.grid-first-layout .username {
  position: static;
  box-sizing: border-box;
  width: calc(var(--cols) * var(--cell) + (var(--cols) - 1) * var(--gap) + 2px);
  height: var(--player-header-height, 92px);
  margin: 0;
  padding: 0 clamp(4px, calc(var(--cell) * .1875), 12px) 4px;
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.arena3.grid-first-layout #p1 .username { margin-left: calc(var(--cell) + 14px); }
.arena3.grid-first-layout.all-text-hidden > .player-wrap .username { position: static; }
body .arena3.grid-first-layout .username > span:first-child,
body:not(.net-mode) .arena3.grid-first-layout #name1 {
  width: 100%;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: left;
  font-size: clamp(14px, calc(var(--cell) * .48), 28px);
  line-height: 1.2;
}
body:not(.net-mode) .arena3.grid-first-layout #name1::after { content: none; }
body .arena3.grid-first-layout .player-header-meta { display: contents !important; }
body .arena3.grid-first-layout .match-counters {
  width: 100%;
  min-width: 0;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  overflow: hidden;
  gap: 3px;
}
body .arena3.grid-first-layout .counter-chip,
body .arena3.grid-first-layout .previous-score,
body .arena3.grid-first-layout .grid-number-chip {
  box-sizing: border-box;
  min-width: 0;
  min-height: 0;
  max-width: 100%;
  padding: 2px clamp(2px, calc(var(--cell) * .1), 8px);
  line-height: 1.1;
  white-space: nowrap;
  overflow-wrap: normal;
  letter-spacing: 0;
}
body .arena3.grid-first-layout .counter-chip {
  flex: 0 1 auto;
  font-size: calc(clamp(18px, calc(var(--cell) * .64), 34px) * var(--counter-scale, 1));
}
body .arena3.grid-first-layout .previous-score {
  flex: 0 1 auto;
  flex-direction: column;
  align-items: center;
  gap: 0;
  font-size: calc(clamp(10px, calc(var(--cell) * .3), 16px) * var(--counter-scale, 1));
}
body .arena3.grid-first-layout .previous-label { font-size: calc(9px * var(--counter-scale, 1)); }
body .arena3.grid-first-layout .grid-number-chip {
  margin: 0;
  transform: none;
  font-size: clamp(10px, calc(var(--cell) * .22), 12px);
}
/* Keep the online grid identifier directly beneath its player's name. */
body.net-mode .arena3.grid-first-layout .username {
  justify-content: flex-end;
  gap: 1px;
  padding-bottom: 2px;
}
body.net-mode .arena3.grid-first-layout .grid-number-chip {
  order: 1;
  align-self: flex-start;
  margin-top: 1px;
  padding-block: 1px;
  font-size: clamp(12px, calc(var(--cell) * .26), 14px);
}
body.net-mode .arena3.grid-first-layout .match-counters { order: 2; }
body.net-mode .arena3.grid-first-layout :is(#p1, #p2) .grid-number-chip { transform: none; }
.cpu-difficulty-badge[hidden], .all-text-hidden .cpu-difficulty-badge { display: none !important; }
.arena3.grid-first-layout .arena-view-controls {
  position: static;
  display: flex;
  transform: none;
  max-width: none;
  z-index: 40;
}
.arena-display-menu {
  position: fixed;
  top: var(--menu-panel-top, 150px);
  left: var(--menu-panel-left, 8px);
  right: auto;
  box-sizing: border-box;
  width: min(280px, calc(100vw - 16px));
  max-height: calc(100dvh - var(--menu-panel-top, 150px) - 8px);
  overflow-y: auto;
  padding: 8px;
  border: 1px solid #538b76;
  border-radius: 8px;
  background: #0d2e23;
  box-shadow: 0 8px 24px #0008;
}
.arena-display-menu[hidden] { display: none !important; }
.arena3.grid-first-layout .arena-display-menu .sound-effects-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  justify-content: stretch;
  width: 100%;
  gap: 5px;
}
.arena3.grid-first-layout .arena-display-menu button {
  position: static;
  display: flex !important;
  width: 100%;
  min-height: 44px;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  padding: 6px 8px;
  font-size: .8rem;
}
.arena3.grid-first-layout .arena-display-menu button[hidden] { display: none !important; }
.arena-display-menu button:disabled { opacity: .5; cursor: default; }
.arena3.grid-first-layout .sound-effects-toggle-label { display: inline; }
.game-pause-button[aria-pressed="true"] { background: #245e49; border-color: #9cdbbb; }
.arena3.is-paused *, .arena3.is-paused ::before, .arena3.is-paused ::after {
  animation-play-state: paused !important;
}
.arena3.grid-first-layout .controls-hint.is-active { display: block !important; }
.arena3.grid-first-layout.instructions-space-hidden .controls-hint,
.arena3.grid-first-layout.instructions-hidden .controls-hint,
.arena3.grid-first-layout.all-text-hidden .controls-hint { display: none !important; }
.arena3.grid-first-layout .sidebar {
  position: absolute;
  grid-area: auto;
  top: var(--arena-header-height);
  left: var(--sidebar-left);
  right: auto;
  bottom: 8px;
  box-sizing: border-box;
  width: var(--aside-space);
  height: calc(var(--rows) * var(--cell) + (var(--rows) - 1) * var(--gap) + 2 * var(--board-pad-y) + 2px + var(--player-header-height));
  min-height: 0;
  margin: 0;
  overflow-y: auto;
}

/* Optional minis use a separate fallback region on crowded desktops. */
.arena3.grid-first-layout.instructions-space-hidden.instructions-peek:not(.instructions-hidden):not(.all-text-hidden) .controls-hint.is-active { display: block !important; }
.arena3.grid-first-layout .sidebar.sidebar-space-hidden.sidebar-peek:not(.sidebar-user-hidden) {
  display: block !important;
  width: min(340px, calc(100% - 16px));
  max-width: calc(100% - 16px);
  top: var(--arena-header-height, 56px);
  bottom: 8px;
  height: calc(var(--layout-height, 100dvh) - var(--arena-header-height, 56px) - 16px);
  z-index: 30;
  background: #0d2e23;
  border: 1px solid #538b76;
  border-radius: 8px;
  overflow-y: auto;
}
.arena3.grid-first-layout .sidebar.sidebar-space-hidden.sidebar-peek:not(.sidebar-user-hidden) {
  left: auto;
  right: 8px;
}

.arena3.grid-first-layout #viewOptionsToggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  width: 44px;
  height: 44px;
  padding: 3px;
  border-color: #87c5ab;
  background: #164a39;
  color: #fff;
  font-size: 10px;
  line-height: 1;
  touch-action: manipulation;
}
.arena3.grid-first-layout #viewOptionsToggle > span:first-child { font-size: 22px; }

/* A separate toolbar keeps controls and match information above both names. */
.arena3.grid-first-layout .arena-toolbar {
  position: absolute;
  top: var(--toolbar-top, 44px);
  left: var(--toolbar-left, 16px);
  width: var(--toolbar-width, calc(100% - 32px));
  height: 44px;
  display: grid;
  grid-template-columns: auto minmax(max-content, 1fr) minmax(0, 1fr);
  grid-template-rows: 44px;
  gap: 4px 16px;
  z-index: 40;
}
body .arena3.grid-first-layout .board-game-title {
  position: absolute;
  top: 4px;
  left: 16px;
  width: max-content;
  max-width: calc(100% - 32px);
  z-index: 0;
  opacity: .65;
  pointer-events: none;
  margin: 0;
  padding: 0;
  transform: none;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 40px;
  white-space: nowrap;
}
body .arena3.grid-first-layout .board-game-title span { font-size: .55em; line-height: 1; }
.arena3.title-space-hidden .board-game-title { display: none !important; }
.arena-actions {
  grid-column: 1;
  grid-row: 1;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 6px;
}
.arena3.grid-first-layout .game-home-button,
.arena3.grid-first-layout .game-pause-button {
  position: static;
  box-sizing: border-box;
  height: 44px;
  min-width: 44px;
  margin: 0;
  padding: 5px;
  transform: none;
}
.arena3.grid-first-layout .game-home-button { font-size: 0; }
.arena3.grid-first-layout .game-home-button::after { content: '\2302'; font-size: 28px; }
.arena3.grid-first-layout .game-pause-button { width: 70px; font-size: .8rem; }
body .arena3.grid-first-layout .arena-timer-overlay {
  position: static;
  grid-column: 2;
  grid-row: 1;
  justify-self: center;
  align-self: center;
  transform: none;
}
body .arena3.grid-first-layout .arena-timer-overlay .controls-timer {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  margin: 0;
  padding: 0;
}
body .arena3.grid-first-layout .arena-timer-overlay .timer-label { font-size: 10px; line-height: 12px; }
body .arena3.grid-first-layout .arena-timer-overlay .timer-value {
  font-size: 32px;
  line-height: 32px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.arena3.grid-first-layout .arena-timer-overlay[hidden] { display: none; }
body .arena3.grid-first-layout:not(.menu-in-header) .arena-timer-overlay .timer-value { padding-block: 0; }
.timer-position-setting { display: grid; gap: 5px; padding: 6px; font-size: 13px; color: #effaf4; }
.timer-position-setting select { min-height: 44px; width: 100%; padding: 8px; border: 1px solid #68a48d; border-radius: 6px; background: #153c2e; color: #effaf4; font: inherit; }
.timer-position-setting select:focus-visible { outline: 2px solid #ffdb89; outline-offset: 2px; }
body .arena3.grid-first-layout.timer-on-left:not(.menu-in-header) .arena-timer-overlay {
  position: absolute;
  grid-area: auto;
  top: var(--timer-side-top);
  left: var(--timer-side-left);
  transform: translate(-100%, -50%);
}
.arena3.grid-first-layout.timer-on-left:not(.menu-in-header) .arena-left-panel {
  max-height: max(44px, calc(var(--timer-side-top) - var(--left-panel-top) - 44px));
}
body .arena3.grid-first-layout .cpu-difficulty-badge,
body .arena3.grid-first-layout .room-info {
  position: static;
  grid-column: 3;
  grid-row: 1;
  justify-self: end;
  align-self: center;
  max-width: 100%;
  margin: 0;
  padding: 0 0 4px;
  transform: none;
  color: #f3dfb3;
  font-size: 14px;
  line-height: 20px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.arena3.grid-first-layout.menu-in-header .arena-toolbar {
  top: 4px;
  left: 8px;
  right: 8px;
  width: auto;
  height: 72px;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-rows: 44px 24px;
}
.arena3.grid-first-layout.menu-in-header .arena-actions { grid-column: 2; justify-content: flex-end; }
body .arena3.grid-first-layout.menu-in-header .cpu-difficulty-badge,
body .arena3.grid-first-layout.menu-in-header .room-info { grid-column: 2; grid-row: 2; align-self: end; }
body .arena3.grid-first-layout.menu-in-header .cpu-difficulty-badge { margin-right: var(--difficulty-inset, 0px); }
body .arena3.grid-first-layout.menu-in-header .arena-timer-overlay { grid-column: 1; grid-row: 1; justify-self: start; }
body .arena3.grid-first-layout.menu-in-header .arena-timer-overlay .timer-value { font-size: 28px; line-height: 30px; letter-spacing: 0; }
.arena3.grid-first-layout.menu-in-header .game-pause-button { width: 62px; }
.arena3.grid-first-layout.menu-in-header .cpu-difficulty-badge { font-size: 12px; }

.game-ready {
  box-sizing: border-box;
  width: min(380px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  padding: 24px;
  overflow: auto;
  border: 1px solid #87c5ab;
  border-radius: 16px;
  color: #effaf4;
  background: linear-gradient(145deg, #173e30, #091c16);
  box-shadow: 0 16px 60px #0009;
}
.game-ready::backdrop { background: #02100b66; }
.game-ready h2 { margin: 0 0 12px; font-size: 26px; }
.game-ready p { margin: 0 0 20px; line-height: 1.5; }
.game-ready-actions { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.game-ready-actions > * { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
.game-ready-actions a { color: #c4efdd; padding: 8px; }
.game-ready-actions :focus-visible { outline: 2px solid #ffdb89; outline-offset: 3px; }
.game-ready #readyStartBtn {
  gap: 10px;
  min-height: 50px;
  min-width: 150px;
  padding: 12px 20px;
  border: 1px solid #68b58e;
  border-radius: 12px;
  color: #effaf4;
  background: linear-gradient(145deg, #286747, #15452f);
  box-shadow: inset 0 1px 0 #ffffff30, 0 4px 0 #0b2b1c, 0 8px 24px #0004;
  font: inherit;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: .02em;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}
.game-ready #readyStartBtn > span { font-size: 12px; }
.game-ready #readyStartBtn:hover {
  background: linear-gradient(145deg, #317955, #1d583d);
  box-shadow: inset 0 1px 0 #ffffff40, 0 4px 0 #0b2b1c, 0 10px 28px #0005;
  transform: translateY(-1px);
}
.game-ready #readyStartBtn:active {
  transform: translateY(2px);
  box-shadow: inset 0 1px 0 #ffffff30, 0 1px 0 #0b2b1c;
}
@media (prefers-reduced-motion: no-preference) {
  .arena3.grid-first-layout.has-local-pause { animation: arena-arrive 240ms ease-out; }
  .game-ready[open] { animation: ready-arrive 200ms ease-out; }
  .game-ready[open]::backdrop { animation: arena-arrive 200ms ease-out; }
}
@keyframes arena-arrive { from { opacity: 0; } to { opacity: 1; } }
@keyframes ready-arrive {
  from { opacity: 0; transform: translateY(8px) scale(.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .game-ready #readyStartBtn { transition: none; }
}

/* Four independent regions: left information, header, main boards, minis. */
.arena3.grid-first-layout .arena-left-panel {
  position: absolute;
  top: var(--left-panel-top);
  left: var(--instructions-left, 8px);
  width: var(--left-panel-width);
  max-height: var(--left-panel-height);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
  min-height: 0;
}
body .arena3.grid-first-layout .arena-left-panel .controls-hint {
  position: static;
  width: 100%;
  max-width: none;
  height: auto;
  min-height: 0;
  flex: 0 1 auto;
  margin: 0;
  padding: 0;
  overflow: auto;
  overflow-wrap: anywhere;
  transform: none;
}
.arena3.grid-first-layout.menu-in-header .arena-left-panel { display: none; }
.arena3.grid-first-layout.menu-in-header.instructions-peek:not(.instructions-hidden):not(.all-text-hidden) .arena-left-panel {
  display: flex;
  position: absolute;
  top: var(--instructions-overlay-top);
  left: 8px;
  width: calc(100% - 16px);
  height: var(--instructions-overlay-height);
  max-height: var(--instructions-overlay-height);
  box-sizing: border-box;
  margin: 0;
  padding: 14px;
  border: 1px solid #87c5ab;
  border-radius: 10px;
  background: #0b2b20f5;
  box-shadow: 0 8px 24px #0008;
  z-index: 35;
}
.mobile-instructions-heading { display: none; }
.menu-in-header .mobile-instructions-heading { display: block; flex: 0 0 auto; }
.mobile-instructions-heading button { min-height: 44px; padding: 8px 14px; }
.mobile-instructions-heading p { margin: 8px 0 0; font-size: 12px; line-height: 1.4; }
body .arena3.mobile-instructions-open .controls-hint.is-active {
  flex: 1 1 auto;
  pointer-events: auto;
  text-align: left;
  font-size: 14px;
  line-height: 1.5;
  overscroll-behavior: contain;
  touch-action: pan-y;
}
.arena3.mobile-instructions-open .controls-hint.is-active > .controls-title,
.arena3.mobile-instructions-open .controls-hint.is-active > .controls-section,
.arena3.mobile-instructions-open .controls-hint.is-active > br { display: block !important; }
:root[data-runtime="mobile"] #changeKeysBtn,
:root[data-runtime="mobile"] .timer-position-setting,
:root[data-runtime="mobile"] #allTextToggle,
:root[data-runtime="mobile"] #miniGridToggle,
:root[data-runtime="mobile"] #mobileMiniGridToggle { display: none !important; }