.memory-stage {
  width: min(900px, 100%);
  margin: 0 auto;
  position: relative;
}

.memory-board {
  position: relative;
  isolation: isolate;
  contain: layout paint;
  width: 100%;
  padding: 16px;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 13px;
  overflow: hidden;
  border: 1px solid rgba(145, 190, 202, 0.24);
  border-radius: 28px;
  background:
    radial-gradient(circle at 50% -12%, rgba(104, 208, 223, 0.14), transparent 42%),
    radial-gradient(circle at 88% 92%, rgba(139, 207, 155, 0.07), transparent 36%),
    linear-gradient(145deg, #0a2028, #07151b 68%);
  box-shadow:
    inset 0 1px rgba(255, 255, 255, 0.06),
    inset 0 -1px rgba(0, 0, 0, 0.22),
    0 28px 58px rgba(0, 0, 0, 0.3);
  transition: border-color .28s ease, box-shadow .28s ease;
}

.memory-board::before {
  content: "";
  position: absolute;
  inset: -45%;
  z-index: -1;
  pointer-events: none;
  background: conic-gradient(from 20deg, transparent, rgba(104, 208, 223, .06), transparent 28%, rgba(139, 207, 155, .045), transparent 62%);
  animation: boardAmbient 18s linear infinite;
}

.memory-board.is-peeking {
  border-color: rgba(104, 208, 223, .48);
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .08),
    0 0 0 1px rgba(104, 208, 223, .08),
    0 28px 64px rgba(0, 0, 0, .34),
    0 0 38px rgba(104, 208, 223, .12);
}

.memory-card {
  --deal-delay: calc(var(--card-index, 0) * 22ms);
  position: relative;
  aspect-ratio: 1;
  min-width: 0;
  padding: 0;
  border: 0;
  border-radius: 19px;
  background: transparent;
  cursor: pointer;
  perspective: 1100px;
  transform: translateZ(0);
  transition: transform .22s cubic-bezier(.2, .75, .25, 1), filter .22s ease;
  -webkit-tap-highlight-color: transparent;
}

.memory-board.is-dealing .memory-card {
  animation: cardDeal .48s cubic-bezier(.2, .82, .2, 1) both;
  animation-delay: var(--deal-delay);
}

.memory-card:active:not(:disabled) { transform: scale(.965); }
.memory-card:focus-visible { outline: 3px solid rgba(104, 208, 223, .58); outline-offset: 3px; }
.memory-card:disabled { cursor: default; }

.memory-card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform .54s cubic-bezier(.2, .78, .2, 1.02);
}

.memory-card.is-flipped .memory-card-inner,
.memory-card.is-matched .memory-card-inner { transform: rotateY(180deg); }

.memory-card-face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid rgba(145, 190, 202, .2);
  border-radius: 19px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .09),
    inset 0 -1px rgba(0, 0, 0, .18),
    0 12px 25px rgba(0, 0, 0, .22);
  transition: border-color .24s ease, box-shadow .24s ease, background .24s ease;
}

.memory-card-front {
  background:
    linear-gradient(145deg, rgba(255, 255, 255, .055), transparent 44%),
    radial-gradient(circle at 68% 22%, rgba(104, 208, 223, .23), transparent 41%),
    linear-gradient(150deg, #122d38, #0c2028);
}

.memory-card-front::before {
  content: "";
  width: 61%;
  aspect-ratio: 1;
  background: url("../../assets/images/memory/Earth.png") center/contain no-repeat;
  filter: drop-shadow(0 9px 13px rgba(0, 0, 0, .25));
  transition: transform .28s cubic-bezier(.2, .8, .2, 1), filter .28s ease;
}

.memory-card-front::after {
  content: "";
  position: absolute;
  inset: -45% -90%;
  pointer-events: none;
  background: linear-gradient(105deg, transparent 42%, rgba(255, 255, 255, .13) 50%, transparent 58%);
  transform: translateX(-32%) rotate(8deg);
  transition: transform .62s ease;
}

.memory-card-back {
  padding: 7px;
  transform: rotateY(180deg);
  background:
    radial-gradient(circle at 50% 42%, rgba(104, 208, 223, .09), transparent 62%),
    linear-gradient(150deg, rgba(12, 34, 43, .99), rgba(6, 19, 25, .99));
}

.memory-card-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  transform: translateZ(0) scale(.96);
  filter: drop-shadow(0 11px 14px rgba(0, 0, 0, .25));
  transition: transform .32s cubic-bezier(.2, .8, .2, 1), filter .32s ease;
}

.memory-card.is-flipped .memory-card-image,
.memory-card.is-matched .memory-card-image { transform: translateZ(0) scale(1); }

.memory-card.just-matched {
  z-index: 3;
  animation: matchedPulse .52s cubic-bezier(.2, .8, .2, 1);
}

.memory-card.just-matched::after {
  content: "";
  position: absolute;
  inset: -7px;
  z-index: 4;
  pointer-events: none;
  border: 2px solid rgba(139, 207, 155, .72);
  border-radius: 24px;
  animation: matchRing .58s ease-out both;
}

.memory-card.is-matched .memory-card-back {
  border-color: rgba(139, 207, 155, .68);
  box-shadow:
    0 0 0 1px rgba(139, 207, 155, .08),
    0 0 30px rgba(139, 207, 155, .24),
    inset 0 1px rgba(255, 255, 255, .12);
}

.memory-card.image-error .memory-card-image { opacity: .15; }
.memory-card.image-error .memory-card-back::after {
  content: "Image unavailable";
  color: rgba(240, 248, 250, .6);
  font-size: .7rem;
  text-align: center;
}

.score-chip strong.stat-bump { animation: statBump .3s cubic-bezier(.2, .85, .25, 1); }
.game-message:not(.hidden) > div { animation: messageIn .42s cubic-bezier(.2, .82, .2, 1) both; }
.game-message.hidden { display: none; }

@media (hover: hover) and (pointer: fine) {
  .memory-card:not(:disabled):hover {
    transform: translateY(-5px) scale(1.015);
    filter: brightness(1.05);
  }

  .memory-card:not(:disabled):hover .memory-card-front::before {
    transform: scale(1.055) rotate(-2deg);
    filter: drop-shadow(0 12px 17px rgba(0, 0, 0, .3));
  }

  .memory-card:not(:disabled):hover .memory-card-front::after { transform: translateX(55%) rotate(8deg); }
  .memory-card.is-flipped:not(:disabled):hover .memory-card-image { transform: scale(1.045); }
}

@keyframes boardAmbient { to { transform: rotate(360deg); } }

@keyframes cardDeal {
  from { opacity: 0; transform: translateY(15px) scale(.93); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes matchedPulse {
  45% { transform: translateY(-3px) scale(1.055); }
  100% { transform: translateY(0) scale(1); }
}

@keyframes matchRing {
  from { opacity: .95; transform: scale(.84); }
  to { opacity: 0; transform: scale(1.16); }
}

@keyframes statBump {
  45% { transform: translateY(-2px) scale(1.12); }
}

@keyframes messageIn {
  from { opacity: 0; transform: translateY(12px) scale(.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@media (max-width: 720px) {
  .memory-board {
    padding: 10px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
    border-radius: 21px;
  }

  .memory-card,
  .memory-card-face { border-radius: 14px; }
  .memory-card-back { padding: 4px; }
  .score-row { grid-template-columns: repeat(3, minmax(80px, 1fr)); width: 100%; }
}

@media (max-width: 430px) {
  .memory-board { padding: 7px; gap: 6px; }
  .memory-card,
  .memory-card-face { border-radius: 11px; }
  .memory-card-front::before { width: 65%; }
  .memory-card.just-matched::after { inset: -4px; border-radius: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  .memory-board::before,
  .memory-board.is-dealing .memory-card,
  .memory-card.just-matched,
  .memory-card.just-matched::after,
  .score-chip strong.stat-bump,
  .game-message:not(.hidden) > div { animation: none; }

  .memory-card,
  .memory-card-inner,
  .memory-card-face,
  .memory-card-image,
  .memory-card-front::before,
  .memory-card-front::after { transition: none; }
}