.game-layout { --game-width: 480px; --board-width: min(100%, calc(100svh - 220px)); }
h1 { position: relative; display: inline-block; justify-self: center; }
.beta-label { position: absolute; top: 0; left: calc(100% + 5px); font-size: 11px; font-weight: 600; letter-spacing: 0; color: var(--muted); }
.game-stats { width: max(min(260px, 100%), var(--board-width)); margin-inline: auto; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px; margin-bottom: 16px; color: var(--muted); font-size: 16px; font-variant-numeric: tabular-nums; }
.game-stats > :first-child { text-align: left; }
.game-stats strong { font-size: 22px; font-weight: 650; }
#timer { color: var(--text); font-size: 28px; font-weight: 650; }
.game-screen { aspect-ratio: 1; width: var(--board-width); margin-inline: auto; border: 1px solid var(--key-border); background: var(--board); --board-content-inset: 0px; }
#board { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); grid-template-rows: repeat(4, minmax(0, 1fr)); gap: clamp(6px, 2vw, 10px); padding: clamp(10px, 3vw, 16px); aspect-ratio: 1; }
/* Both faces are absolutely positioned inside one fixed grid cell. Artwork never
   participates in sizing, so flipping cannot alter card or row dimensions. */
.card { position: relative; min-width: 0; min-height: 0; padding: 0; border: 0; border-radius: 0; background: transparent; color: var(--text); perspective: 650px; }
.card:disabled { opacity: 1; }
.card-flipper { position: absolute; inset: 0; transform-style: preserve-3d; transition: transform 280ms ease-in-out; pointer-events: none; }
.card-face { position: absolute; inset: 0; display: grid; place-items: center; border: 1px solid var(--key-border); border-radius: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; }
.card-back { background: var(--secondary); }
.card-back::before { content: ''; width: 18%; aspect-ratio: 1; border: 2px solid var(--muted); border-radius: 2px; opacity: .35; transform: rotate(45deg); }
.card-front { background: var(--board); transform: rotateY(180deg); }
.card.is-open .card-flipper { transform: rotateY(180deg); }
.card.is-matched .card-front {
  background: color-mix(in srgb, var(--primary) 5%, var(--board));
  border-color: color-mix(in srgb, var(--primary) 38%, var(--key-border));
  animation: pair-confirm 520ms ease-out;
}
.card svg { position: absolute; inset: 0; margin: auto; display: block; width: 80%; height: 80%; color: var(--primary); transform-origin: center; }
.card.is-matched svg { opacity: .7; animation: pair-settle 400ms 100ms ease-out both; }
@keyframes pair-confirm {
  0%, 100% { box-shadow: inset 0 0 0 0 transparent; }
  40% {
    background: color-mix(in srgb, var(--primary) 17%, var(--board));
    box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--primary) 28%, transparent);
  }
}
@keyframes pair-settle {
  0% { transform: scale(1); opacity: 1; }
  35% { transform: scale(1.08); opacity: 1; }
  100% { transform: scale(1); opacity: .7; }
}
.completion { gap: 12px; text-align: center; cursor: pointer; animation: completion-arrive 280ms ease-out both; }
.completion h2 { margin: 0; font-size: clamp(23px, 6vw, 32px); font-weight: 750; color: var(--primary); }
.completion p { margin: 0; font-size: 20px; font-weight: 600; font-variant-numeric: tabular-nums; }
.completion-dismiss { margin-top: 18px; font-size: 13px; color: var(--muted); }
.completion:focus { outline: none; }
#board.won { animation: completion-blink 350ms ease-in-out 2; }
@keyframes completion-arrive { from { opacity: 0; } to { opacity: 1; } }
@keyframes completion-blink { 50% { opacity: .55; box-shadow: 0 0 0 3px var(--primary); } }
.overlay { inset: 0; padding: 24px; }
#start { min-width: 160px; min-height: 56px; font-size: 20px; }
#start-view { gap: 12px; }
.privacy-link { background: transparent; color: var(--muted); text-decoration: underline; text-underline-offset: 3px; font-size: 13px; padding: 6px 8px; }
.privacy-view { background: var(--board); gap: 16px; overflow-y: auto; }
.privacy-view h2 { font-size: 22px; margin: 0; }
.privacy-view p { margin: 0; font-size: 14px; line-height: 1.5; color: var(--muted); }
.privacy-view .privacy-link { margin-top: 0; padding-left: 0; }
.game-actions { margin-top: 16px; }
.game-actions button { min-width: 140px; }
button:active { filter: none; }
.card[aria-disabled='true'] { cursor: default; }
@media (max-width: 480px) {
  .game-layout { --board-width: min(100%, calc(100svh - 220px)); }
  .page-navigation { grid-column: 1 / -1; grid-row: 1; position: absolute; inset: 0; width: 100%; pointer-events: none; }
  .page-navigation .icon-button { flex-basis: 44px; width: 44px; pointer-events: auto; }
  .page-home { margin-right: auto; }
  .game-header { margin-bottom: 14px; }
  h1 { font-size: 27px; }
  .beta-label { font-size: 10px; }
  .game-stats { margin-bottom: 12px; }
}
@media (max-width: 360px) { .beta-label { top: -8px; font-size: 9px; } }
@media (min-width: 481px) {
  .game-layout { --board-width: min(100%, 448px, calc(100svh - 260px)); }
  .game-actions { margin-top: 24px; }
}
@media (max-height: 650px) and (min-width: 481px) {
  .game-page { padding: 12px; }
  .game-header { margin-bottom: 8px; }
  .game-stats { margin-bottom: 8px; }
  .game-layout { --board-width: min(100%, 448px, calc(100svh - 210px)); }
  .game-actions { margin-top: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .card-flipper { transition: none; }
  .completion, #board.won, .card.is-matched .card-front, .card.is-matched svg { animation: none; }
}
@media (max-height: 650px) and (min-width: 481px) {
  .completion { padding: 12px; gap: 6px; }
  .completion h2 { font-size: 24px; }
  .completion p { font-size: 18px; }
  .completion-dismiss { margin-top: 8px; font-size: 12px; }
}
/* The shared navigator pans/zooms only the grid; overlays stay inside the frame. */
.board-scroll { position: absolute; inset: 0; display: flex; overflow: auto; overscroll-behavior: contain; scrollbar-width: none; touch-action: none; }
.board-scroll::-webkit-scrollbar { display: none; }
#board { flex: none; margin: auto; width: var(--board-width, 100%); height: var(--board-height, 100%); min-height: 0; grid-template-columns: repeat(var(--columns, 4), minmax(0, 1fr)); grid-template-rows: repeat(var(--rows, 4), minmax(0, 1fr)); gap: clamp(2px, .6vw, 4px); padding: clamp(8px, 2.4vw, 14px); aspect-ratio: auto; }
.board-scroll.is-dragging, .board-scroll.is-dragging button { cursor: grabbing; }
.card { touch-action: none; }
.game-screen > .overlay { z-index: 3; }
.card.is-blocked { background: repeating-linear-gradient(135deg, transparent 0 5px, var(--key-border) 5px 6px); opacity: .45; }
.card.is-blocked .card-flipper { visibility: hidden; }
.card svg[data-color='1'] { color: light-dark(#2869b2, #80b8ff); }
.card svg[data-color='2'] { color: light-dark(#ac4965, #f391af); }
.card svg[data-color='3'] { color: light-dark(#9a6a10, #e7bc62); }
.card svg[data-size='small'] { width: 42%; height: 42%; }
.card svg[data-size='large'] { width: 84%; height: 84%; }
#custom-size { width: min(340px, calc(100vw - 32px)); max-height: calc(100svh - 24px); overflow: auto; padding: 20px; border: 1px solid var(--key-border); border-radius: 8px; background: var(--board); color: var(--text); }
#custom-size::backdrop { background: #0006; }
#custom-title { font-size: 20px; margin: 0 0 16px; }
#size-preview { position: relative; width: min(100%, 220px); aspect-ratio: 1; margin: 0 auto 18px; background-image: linear-gradient(to right, var(--key-border) 1px, transparent 1px), linear-gradient(to bottom, var(--key-border) 1px, transparent 1px); background-size: 5% 5%; border: 1px solid var(--key-border); touch-action: none; }
#size-fill { background: color-mix(in srgb, var(--primary) 22%, transparent); border: 1px solid var(--primary); pointer-events: none; }
#size-handle { position: absolute; width: 22px; height: 22px; padding: 0; transform: translate(-50%, -50%); border: 1px solid var(--primary); border-radius: 3px; touch-action: none; }
#size-handle::before { content: '↔'; display: block; transform: rotate(-45deg); font-size: 16px; }
.dimension-fields { display: flex; gap: 16px; }
.dimension-fields label { flex: 1; font-size: 13px; color: var(--muted); }
.dimension-fields input { display: block; width: 100%; margin-top: 6px; padding: 8px; text-align: center; font: inherit; font-size: 18px; color: var(--text); background: var(--secondary); border: 1px solid var(--key-border); border-radius: 4px; }
.dimension-fields input:focus { outline: none; background: color-mix(in srgb, var(--primary) 13%, var(--board)); }
#custom-warning { min-height: 18px; margin: 8px 0; font-size: 12px; color: var(--muted); }
.custom-actions { display: flex; gap: 10px; }
.custom-actions button { flex: 1; }
#custom-size button:hover, .select-trigger:hover { filter: none; }
#size-handle { min-height: 22px; }
@media (max-height: 600px) { #size-preview { width: 150px; } #custom-size { padding: 16px; } }
/* Tutorial examples share the live artwork and card proportions. */
.memory-example { display: flex; width: calc(100% - 16px); margin-inline: auto; height: 100%; align-items: center; justify-content: center; gap: 10px; }
.memory-example-card { position: relative; flex: 1; max-width: 64px; aspect-ratio: 1; border: 1px solid var(--key-border); display: grid; place-items: center; color: var(--primary); }
.memory-example-card.card-back::before { position: absolute; }
.memory-example svg { position: absolute; inset: 0; margin: auto; width: 80%; height: 80%; min-height: 0; }
.memory-example svg[data-color='1'] { color: light-dark(#2869b2, #80b8ff); }
.memory-example svg[data-color='2'] { color: light-dark(#ac4965, #f391af); }
.memory-example svg[data-size='small'] { width: 42%; height: 42%; }
.memory-example svg[data-size='large'] { width: 84%; height: 84%; }

.game-guide h2 { margin-bottom: 16px; }
.game-guide .guide-caption { margin-top: 16px; }